Preparer's Certification for Decker Prairie Rosehill Road Bridge at Spring Creek

Judy Morales
2017-04-28
Texas Department of Transportation

Preparer’s Certification for

Specifications, Special Specifications, Special Provisions, Estimate and Specification Data 

Special Note:

 

The following items developed per the published Construction Drawings have been verified and included in the Purchasing Department’s Bid Specification Package which can be located at https://bids.hctx.net/bso/. The items include:

  • Pricing/Delivery Information
  • ·        Scope of Work
    • Special Provision to Standard Specifications
    • ·        Special Specifications
      • Supplement to General Requirements
      • ·        Contract Time

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SCOPE OF WORK

 

 

This project is to provide erosion repairs to Spring Creek at the Decker Prairie Rosehill Rd Bridge. Bridge is located at the Northwest side of Houston in Precinct 3, KM 287 E. Work includes, backfilling eroded soil, reshaping bullrock for subgrade preparation, replacing cracked concrete slope paving, and installing new concrete slope paving and riprap.

 

All work shall be performed in accordance with the attached drawings and specifications.

 

GENERAL NOTICE TO CONTRACTORS

 

In accordance with House Bill 1059, a minimum of 25%  of  the  work to  be  performed on  this  project  shall be performed by the Bidder.

 

Special Notice: By law, the original price on firm  fixed  price  contracts may  not  be  increased  by  more than 25%. The original price may not be decreased  by  18%  or  more  without  the  consent  of  the contractor. Please monitor additions to your contract -  additions in  excess  of  25%  will  not  be  paid  under any circumstances.

 

On public works projects, al l contractors s ha l l supply a list of all suppliers a nd subcontractors w i t h addresses and phone numbers, prior to work commencing.

 

At the time of the scheduled preconstruction meeting, the successful  bidder shall supply to the County a list of  representatives  signed  by  an  Officer  of  the  Company  who  are  authorized  to  sign  official documents, i.e., Purchase Orders, Change Orders, Final Estimates, etc.

 

In determining who is a responsible bidder, Harris County may take  into account  the past  performance of the bidder on Harris Coun t y p r oj ect s . Commissioners' Court a dopt e d a written definition and criteria for determining the performance of a contractor which may be considered in determining the responsibility of a bidder.

 

Harris County is using internet-based software "Capital Projects Management and Tracking System (CAPTRAC)” to maintain consistent administrative and technical control for its projects throughout the County. The Contractor is required to use CAPTRAC on this project in accordance with procedures  provided (the User’s Guide and Quick Reference Guide in Construct-It under Help link) by the County. CAPTRAC stores electronic project correspondence  and  related  project  documents  such  as  RFI's (requests for information) and submittals. CAPTRAC provides the ability t o  vi e w  contract bi d items/pay estimate status, submittal status, RFI status, and change order history, etc.

 

At no cost to the Contractor, the County will provide system login account(s) and provide training for Contractor pe rs onne l . The Contractor must update CAPTRAC with any new or changed information within 24 hours of that information becoming known to Contractor.

 

Therefore, t he Contractor must have access to a computer with internet access and a scanner to use CAPTRAC.

 

GENERAL NOTES

1. COMPUTATION OF CONTRACT TIME: IN THE COMPUTATION OF CONTRACT TIME, SATURDAYS, SUNDAYS, AND HOLIDAYS ARE INCLUDED, HOWEVER, THERE IS SUFFICIENT TIME IN MONDAY THROUGH FRIDAY FOR THE COMPLETION OF THE PROJECT. THEREFORE, ANY WORK ON SATURDAYS, SUNDAYS, AND HOLIDAYS MUST BE APPROVED 48 HOURS IN ADVANCE BY THE COUNTY ENGINEER.

 

GENERAL CONSTRUCTION NOTES:

 

  1. THE     CONTRACTOR      SHALL     FIELD     VERIFY     EXISTING     CONDITIONS      BEFORE     BEGINNING CONSTRUCTION.

 

  1. THE CONTRACTOR IS RESPONSIBLE FOR PROVIDING SECURITY TO PROTECT THE PROJECT SITE, CONTRACTOR PROPERTY, EQUIPMENT, AND WORK

 

  1. THE CONTRACTOR IS RESPONSIBLE FOR CLEANING STREETS OF CONSTRUCTION DIRT AND DEBRIS AT CLOSE OF EACH WORK DAY.

 

  1. THE CONDITION OF THE ROAD AND/OR RIGHT-OF-WAY, UPON COMPLETION OF THE JOB SHALL BE AS GOOD AS OR BETTER THAN PRIOR TO STARTING WORK.

 

  1. PRIOR TO CONSTRUCTION, THE CONTRACTOR, ALONG WITH CONCURRENCE FROM THE FIELD ENGINEER, SHALL DETERMINE HIS/HER LAY-DOWN AND/OR STAGING AREA LOCATIONS.

 

  1. THE CONTRACTOR SHALL NOTIFY ALL PROPERTY OWNERS A MINIMUM OF 24 HOURS PRIOR TO BLOCKING DRIVEWAYS OR ENTERING UTILITY EASEMENTS.

 

  1. TRAFFIC INGRESS AND EGRESS FOR DRIVEWAYS AND PEDESTRIAN ACCESS FACILITIES SHALL BE MAINTAINED THROUGHOUT CONSTRUCTION.

 

  1. THE CONTRACTOR SHALL REMOVE ANY FENCES, POSTS, MAILBOXES, PLANTERS, PERMANENT TRASH CONTAINERS, CULVERTS, ETC. OR SECTIONS THEREOF, THAT ENCROACH WITHIN THE COUNTY'S RIGHT-OF-WAY. NOTE: PRIOR TO CONSTRUCTION, THE PROPERTY OWNER WAS PAID TO RELOCATE OR REPLACE THESE ITEMS OUTSIDE OF THE COUNTY'S RIGHT-OF-WAY. IF THE OWNER HAS FAILED TO DO SO, THE CONTRACTOR WILL REPLACE THEM WITH THE MINIMUM LEVEL OF QUALITY NEEDED TO SECURE THE PROPERTY AND/OR MAINTAIN MAIL DELIVERY. IN THAT CASE, PAYMENT FOR THESE INSTALLATIONS WILL BE INCLUDED AS EXTRA WORK ITEMS OR AS OVERRUNS TO EXISTING PAY ITEMS.

ANY DAMAGE CAUSED BY THE CONTRACTOR TO SUCH ITEMS LOCATED OUTSIDE OF THE COUNTY'S RIGHT-OF-WAY, SHALL BE REPLACED WITH LIKE-KIND OR BETTER AT THE CONTRACTOR'S EXPENSE.

ALSO, IF THESE ITEMS ARE LOCATED WITHIN THE PROJECT RIGHT-OF-WAY AND ARE DESIGNATED TO REMAIN, ANY DAMAGE CAUSED BY THE CONTRACTOR TO SUCH ITEMS, SHALL BE REPLACED WITH LIKE-KIND OR BETTER AT THE CONTRACTOR'S EXPENSE.

TREES, BUSHES, SHRUBBERY AND OTHER DAMAGED PLANTINGS DESIGNATED TO REMAIN SHALL BE REPLACED WITHIN 72 HOURS OF REMOVAL AND ARE TO BE THOROUGHLY WATERED-IN. NO SEPARATE PAY.

 

  1. PAVED SURFACES, PAVEMENT MARKERS AND MARKINGS SHALL BE PROTECTED FROM DAMAGE BY TRACKED EQUIPMENT.

 

  1. IRON RODS DISTURBED DURING CONSTRUCTION ARE TO BE REPLACED BY A REGISTERED PUBLIC LAND SURVEYOR FOR THE ORIGINAL PROPERTY OWNER AT NO SEPARATE PAY.

 

  1. CONSTRUCTION STAKING WILL BE PROVIDED BY THE CONTRACTOR. TWO COPIES OF TAKING NOTES TO BE PROVIDED TO THE ENGINEER PRIOR TO CONSTRUCTION.
  2. THE COUNTY OR THE COUNTY'S SURVEYOR SHALL PROVIDE A BENCHMARK OR TEMPORARY BENCHMARK AND SURVEY CONTROLS.

 

 

  1. THE CONTRACTOR SHALL MAINTAIN UPDATED RED-LINED RECORD DRAWINGS ON SITE FOR INSPECTION BY THE ENGINEER.

 

  1. MOWING, MAINTENANCE, AND CLEAN-UP OF THE PROJECT SHALL MEET THE REQUIREMENT OF SPECIFICATION ITEM 560 (NO SEPARATE PAY). MOWING, MAINTENANCE, AND CLEAN-UP IS REQUIRED FOR THE PROJECT LIMITS AND DURATION, REGARDLESS OF THE CONTRACTOR'S SCOPE OF ACTIVITIES WITHIN THE PROJECT LIMITS.

 

  1. THE REMOVAL OF ANY ABANDONED UTILITIES REQUIRED TO COMPLETE THE WORK SHALL BE INCIDENTAL AND NO SEPARATE PAYMENT SHALL BE MADE.

 

  1. IT IS THE CONTRACTOR'S RESPONSIBILITY TO STOCKPILE NECESSARY MATERIAL ON-SITE OR AT A SECURED OFF-SITE LOCATION AT NO ADDITIONAL EXPENSE TO HARRIS COUNTY. ANY SUITABLE EXCAVATED MATERIAL ON THE PROJECT WHICH IS AVAILABLE AT THE TIME OF NEED; WHETHER FROM STORM SEWER, ROADWAY, AND/OR CHANNEL EXCAVATION, SHALL BE USED BEFORE BORROW IS BROUGHT ON-SITE.

 

  1. MANHOLES, JUNCTION BOXES, INLETS, AND RISERS ARE TO BE PRE-CAST OR CAST IN PLACE.

 

  1. CONTRACTOR SHALL COMPLY WITH OSHA REGULATIONS AND STATE OF TEXAS LAW CONCERNING EXCAVATION, TRENCHING, AND SHORING AS SPECIFIED IN CITY AND STATE OF TEXAS ORDINANCES

 

  1. THE DESIGN AND CONSTRUCTION OF DEWATERING SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR, A PLAN SHALL BE SUBMITTED FOR HARRIS COUNTY APPROVAL BEFORE BEGINNING CONSTRUCTION. A PAY ITEM FOR THIS WORK IS INCLUDED IN THE BID SHEETS.

 

  1. FOR ANY TRENCH EXCAVATION IN MATERIALS OTHER THAN SOLID ROCK, GREATER THAN 5 FEET IN DEPTH, THE CONTRACTOR SHALL PROVIDE A TRENCH SAFETY SYSTEM IN ACCORDANCE WITH OSHA, SAFETY & HEALTH REGULATIONS, PART 1926, SUBPART P-"EXCAVATIONS, TRENCHING AND SHORING" (LATEST EDITION).

 

STANDARD HARRIS COUNTY FLOOD CONTROL DISTRICT NOTES

 

  1. OBTAIN AND COMPLY WITH ALL APPLICABLE CITY, COUNTY, STATE, AND FEDERAL PERMITS AND APPROVALS, WITH ASSISTANCE FROM ENGINEER, IF NECESSARY. OBTAIN PERMIT (CERTIFICATION) FROM HARRIS COUNTY ENGINEER TO ENTER HARRIS COUNTY FLOOD CONTROL DISTRICT RIGHT-OF-WAY.

 

  1. NOTIFY THE HARRIS COUNTY FLOOD CONTROL DISTRICT’S PROPERTY MANAGEMENT DEPARTMENT IN WRITING AT LEAST 48 HOURS PRIOR TO CONSTRUCTION. SUBMIT THE HCFCD 48 HOUR PRE-CONSTRUCTION NOTIFICATION FORM, A COPY OF THE APPROVED CONSTRUCTION DRAWINGS, AND A COPY OF THE CORPS OF ENGINEERS INDIVIDUAL SECTION 404 PERMIT, IF APPLICABLE, TO HCFCD, 9900 NORTHWEST FREEWAY, HOUSTON, TEXAS 77092, ATTN: PROPERTY MANAGEMENT DEPT. BY HAND DELIVERY, OR FAX TO 713-684-4129 (FAX NUMBER).

 

  1. ENGINEER SHALL SUBMIT CERTIFICATION LETTER AND RECORD DRAWINGS TO THE HARRIS COUNTY FLOOD CONTROL DISTRICT’S PROPERTY MANAGEMENT DEPARTMENT REQUESTING INSPECTION OF ITEMS CONSTRUCTED IN HARRIS COUNTY FLOOD CONTROL DISTRICT RIGHT-OF- WAY. PRIOR TO REQUESTING INSPECTION, THE DRAINAGE RIGHT-OF-WAY AND/OR EASEMENTS SHALL BE STAKED AND FLAGGED.

 

  1. PROTECT, MAINTAIN, AND RESTORE EXISTING BACKSLOPE DRAINAGE SYSTEMS.
  2. BACKSLOPE SWALE AND INTERCEPTOR STRUCTURE ELEVATIONS AND LOCATIONS SHOWN ON PLANS ARE APPROXIMATE. FINAL ELEVATIONS AND LOCATIONS SHALL BE FIELD VERIFIED BY THE ENGINEER PRIOR TO INSTALLATION.
  3. ESTABLISH TURF GRASS ON ALL DISTURBED AREAS WITHIN THE CHANNEL OR DETENTION RIGHT- OF-WAY, EXCEPT THE CHANNEL BOTTOM AND WHERE STRUCTURAL EROSION MEASURES ARE USED. MINIMUM ACCEPTANCE CRITERIA ARE 75% COVERAGE OF LIVE BERMUDA GRASS AND NO EROSION OR RILLS DEEPER THAN 4”.

 

 

  1. BACKFILL IN ACCORDANCE WITH THE HARRIS COUNTY SPECIFICATION ITEM 120-CHANNEL EXCAVATION AND ITEM 132-ENBANKMENT.

 

  1. EXCAVATE CHANNEL FLOWLINE TO DESIGN ELEVATION AS SHOWN ON PLANS AND DOWNSTREAM, AS NECESSARY, TO ENSURE NO WATER REMAINS IN THE FACILITY (STORM SEWER, LATERAL CHANNEL, OR DRY BOTTOM DETENTION BASIN) DURING NORMAL WATER SURFACE CONDITIONS IN THE CHANNEL, SO THE FACILITY WILL FUNCTION AS INTENDED. FOR WET BOTTOM DETENTION BASINS, ENSURE NO WATER IS ABOVE THE DESIGN LEVEL IN THE WET BOTTOM DURING NORMAL WATER SURFACE CONDITIONS IN THE CHANNEL.

 

  1. MAINTAIN FLOW IN CHANNEL DURING CONSTRUCTION AND RESTORE CHANNEL TO ORIGINAL CONDITION.

 

  1. REMOVE ALL EXCAVATED MATERIAL FROM THE HARRIS COUNTY FLOOD CONTROL DISTRICT OR DRAINAGE RIGHT-OF-WAY. NO FILL IS TO BE PLACED WITHIN A DESIGNATED FLOOD PLAIN AREA WITHOUT FIRST OBTAINING A FILL PERMIT FROM THE APPROPRIATE JURISDICTIONAL AUTHORITY.

 

 

STORM WATER QUALITY NOTES

 

  1. SWQMP: THIS PROJECT DOES NOT REQUIRE A STORM WATER QUALITY MANAGEMENT PLAN (SWQMP) BECAUSE IT DOES NOT MEET THE DEFINITION OF NEW DEVELOPMENT OR SIGNIFICANT REDEVELOPMENT UNDER THE HARRIS COUNTY REGULATIONS.

 

  1. SWPPP: THIS PROJECT DISTURBS LESS THAN 1 ACRE AND IS NOT PART OF A LARGER COMMON PLAN OF DEVELOPMENT; THEREFORE, COVERAGE IS NOT REQUIRED UNDER THE TPDES GENERAL PERMIT TXR150000 FOR STORM WATER DISCHARGES ASSOCIATED WITH CONSTRUCTION ACTIVITIES. HOWEVER, THE CONTRACTOR SHALL USE BEST MANAGEMENT PRACTICES SHOWN IN THE PLANS TO MINIMIZE OR PREVENT EROSION, OFF-SITE TRANSPORT OF SEDIMENT, AND POLLUTION.

 

Notice  to Contractors

of

Texas Board of Professional Engineers Policy Advisory Regarding Procurement of Engineering Services By General Construction Contractors for Governmental Public Works Projects

 

On August 20, 2009, the Texas Board of Professional Engin eers adopted a document entitled "Texas Board of Professional Engineers Policy Advisory Regarding Procurement of Engineering Services by a general Contractor for Governmental Public Works Projects''. A copy of said Advisory is attached for information should the Contractor decide to obtain any professional engineering services in accomplishing th is Project.

 

Texas Board of Professional Engineers

Policy Advisory Regarding Procurement of Engineering Services by Genera] Construction Contractors for Governmental Public Worlis Projects

 

August  20, 2009

 

Definitions:

Project Professional Engineer - Engineer(s) or engineering firms retained by a governmental entity co perform engineering services for a specific public works project.

Genera! Construction Concractor - Private entity retained by a governmental entity to construct a public works project designed by the Project Professional Engineer.

Other Professional Engineers - Engineer(s) or engineering firms which may be retained by the General Construction Contractor or his subcontractors or vendors co fulfill engineering requirements of the project during the construction phase.

 

Background: The Dallas  -  Fr.  Worth  International  Airport  Board  (DFWIAB)  has  requested  clarification  on  the Te xas Board of Professional Engineers'  (Board)  interprecmion  of  the  Professional  Services  Procurement  Act  (PSPA) requirements comained in the  Texas  Engineering  Practice  Act  (Act).  In  the  course  of  complex  public works projects, the need often  arises  for  Other  Professional  Engineers  ta  be  engaged  to  perform  tasks  unforeseen by the Project Professional  Engineers  or  tasks  nor  authorized  to  be  performed  by  the  Project  Professional Engineers since they would involve dictating the General Construction Contractor's  means  and  methods  of construction. Examples of such engineering tasks include but are not limited to:

 

l) Trench safety plans.

2)     Traffic control plans.

3)    Temporary construction structures (crane foundations, for example).

 

Applicable Board Rules from the Act:

 

§137.53 Engineer Standards of Compliance with Professional Services Procurement Act

(a)   A licensed engineer shall not submit or request, orally or in writing, a competitive bid to perform professional engineering services for a governmental entity unless specifically authorized by state law and shall report to the board any requests from governmental entities and/or their representatives that request  a  bid  or  cost  and/or pricing information or any other information  from which  pricing or cost can be derived  prior  to selection  based on demonstrated competence and qualifications to perform the serv ices .

(b)    For the purposes of this section,  competitive  bidding  to  perform  engineering  services  includes,  but  is  not  limited to, the submission of any  monetary  cost  information  in  the  initial  step  of  selecting  qua lified  engineers. Cost information or other  information  from which  cost can  be derived  must  not  be submitted  until  the second  step of negotiating a contract at a fair and reasonable cost.

(c)   This section does not prohibit competitive bidding in the private sector.

Source Note: The provisions of this §137.53 amended to be effective June 4, 2007.

 

§137.79 Standards for Compliance with Professional Services Procurement Act

When procuring professional engineering services, a governmental enrity and/or its representative(s) shall comply with the requirements of Subchapter A, Chapter 2254, Texas Government Code and shall select and award on the basis of demonstrated competence and qualifications to perform the services for a fair and reasonable price and shall not select services or award contracts on the basis of competitive bidding.

 

 

Adopted by the Texas Board of Professional Engineers August 20, 2009

 

Source Nore: The provisions of rhis §137.79 amended ro be effective December 21, 2008.

 

Analysis of Board Rules,  Texas  Administrative  Code,  Title  22,  Part  6,  Chapter  137:  A  reading  of  Board Rule 137.53 reveals that no language exists specific to the selection of Other Professional Engineers that may be required during the construction phase of the project and that would be selected by a General Construction Contractor. Rule 137.53 is specific, however, in that all professional engineers must nor divulge cost information prior to being selected solely on their qualifications. The rule also requires licensed professional engineers  co  report to the Board any instance where a governmental  entity  and/or  their  representative  requests  cost information prior tO the qualification based selection phase. The board would interpret a General Construction Contractor co be a represemative of the governmenral entity. Similarly, Board Rule 137.79 requires that governmenral entities or their representatives use qualification based selection processes.

 

Process: If professional  engineering  services are required during  the course of the project,  the public entity or  the General Construction Contractor must use qualification based selection to procure all engineering services regardless of when the services are required. The following language is used by the DFWIAB in their contract documents to communicate this requirement ro their contractors and representatives:

 

Ancillary/ Integral Professional Services: In selecting an archirecr, engineer or land surveyor, ere., lO provide professional services, if any, thar are required by the specificarions, bidder shall not do so on rhe basis of competitive bids bw shall make such selecrion on rhe basis of demonstrated comperence and qualifications ro pe,.form the services in rhe manner provided by Secrion 2254.004 of the Texas Govemmem Code and so shall cerrijy ro the Board (DflVUB) with irs bid.

 

The above contract language  covers  instances  where  a  General  Construction  Contractor's  means  and  methods would trigger the requirement for Other Professional Engineering services chat were not performed by the Project Professional Engineers. Examples  include  traffic  control  plans  for  contractor  controlled  disruptions  of  normal traffic , or instances where Other Professional Engineering services would be sought to build a temporary crane foundation.  The  General  Construction  Contractor  would  use  a  qualification  based  selection  process  to  select Other Professional Engineers and would certify in writing to the governmental entity that the  QBS  process  was followed and no pricing or costing data was used in the process.

 

Limitations: The QBS process performed by General  Construction Contractors described  in this policy advisory is inte nded only for those limited instances where:

 

l)       Engineering decisions or designs performed by the governmental entity's Project Professional Engineer would interfere with the contractor's means and methods of construction or

 

2) Unforeseen construction  issues  necessicate  the  services  of  Other  Professional  Engineers  in  the  course of the project.

 

 

Adopted by the Texas Board of Professional Enginee rs August 20, 2009

 

SPECIAL NOTICE TO CONTRACTORS

 

 

In the hauling of construction materials, excavation equipment or other items required in the completion of this project, the attention of prospective bidders is directed to ordinances  and  regulations  of  local, municipal, or county governments which limit the type or the gross weight of motor vehicle or construction equipment operating on public roads and streets or which restrict the use of such  equipment  on certain streets.

 

It will be the responsibility  of  prospective  bidders  to  investigate  any  limitations  in  routing,  size  of equipment, or gross  vehicle  weights  which  may  be  subject  to  regulations  by  local  governmental jurisdictions.

 

Attention of prospective bidders is also invited to the provisions of City of Houston Ordinance No. 62-888, dated June 20, 1962, which requires the licensing of vehicles which are used in the transportation of earth, sand, shell, gravel and similar construction or excavated materials.

 

 

Approved by Harris County Commissioners' Court July 23, 1962, Vol. 51.

 

NOTICE TO CONTRACTORS ON STORM WATER QUALITY AND

ENVIRONMENTAL ISSUES

 

In addition to the regulatory requirements stated in the General Conditions, the Contractor shall recognize and comply with the following:

 

SECTION 1. STORM WATER POLLUTION PREVENTION PLANS

  1. COVERAGE

Coverage under the Texas Pollutant Discharge Elimination System (TPDES) General Permit TXR150000 for storm water discharges associated with construction activities is required for a project that disturbs 1 acre or greater (or is a part of a larger common plan of development with the potential to disturb 1 acre or greater). Coverage requires the preparation, implementation, inspection, and maintenance of a Storm Water Pollution Prevention Plan (SWPPP), in accordance with the TPDES General Permit.

  1. PROJECT CLASSIFICATION

This project is classified as one of three categories listed below. The Contractor shall be responsible for the storm water quality items, accordingly.

 

  1. “Construction Sites That Do Not Require TPDES General Permit Coverage”

The project disturbs less than 1 acre (and is not part of a common plan of development with the potential to disturb 1 acre or more); therefore, coverage under the TPDES General Permit is not required. However, the Contractor shall implement good housekeeping measures to minimize the potential for pollutants, associated with the construction activities, to enter the storm sewer system. Item 725, “General Source Controls”, shall be implemented by the Contractor, as well as any other erosion, sedimentation, and pollution controls shown in the plans and project manual.

 

or

  1. “Small Construction Sites”

The project disturbs 1 acre or more, but less than 5 acres, (or is part of a common plan of development with the potential to disturb 1 acre or more); therefore, coverage under the TPDES General Permit is required. The Contractor shall implement, inspect, and maintain the Storm Water Pollution Prevention Plan shown in the plans and project manual. Certification of a TCEQ Small Construction Site Notice (CSN) in accordance with Part II.E.2 of the TPDES General Permit is required. The Contractor, as a primary operator, as defined  by  TPDES  General  Permit, shall certify one Construction Site  Notice  (CSN)  and  provide  this to Harris County at the time that the contract is awarded. Harris County (owner), as primary operator, as defined by TPDES General Permit, shall certify a second Construction Site Notice (CSN) at the time

 

the contract is awarded. After the project is awarded, Harris County shall provide copies of the two certified Construction Site Notices (CSN) to the Contractor, and send copies to the local storm sewer operator for notification purposes. Prior to commencing construction activities, the Contractor shall laminate and post the notices on the project site in a location where they are readily available for public viewing. The  Contractor shall maintain the posted notices until after completion of the construction activities and final stabilization of the project site as defined by the TPDES General Permit. When the project is completed and stabilization is achieved, as defined by the TPDES General Permit, then the Contractor shall note the date that the Small Construction Site Notice was removed from the project site. A copy of the completed Small Construction Site Notice shall be provided to the Engineer with the SWPPP records. The County shall then notify the local storm sewer operator that storm water associated with construction activities is no longer being discharged from the site.

or

 

  1. “Large Construction Sites”

The project disturbs 5 acres or greater (or is part of a common plan of development with the potential to disturb 5 acres or more); therefore, coverage under the TPDES General Permit is required. The Contractor shall implement, inspect, and maintain the Storm Water Pollution Prevention Plan shown in the plans and project manual. Certification of a Notice of Intent (NOI) in accordance with Part II.E.3 of the TPDES General Permit is required and shall be completed in accordance with Harris County Specification Item Number 700. The Contractor shall not commence with any earth disturbing activities on the project site until:

  • at least seven (7) days after submittal of the NOI (Harris County & Contractors) via U.S. Postal Service, or if Utilizing electronic submittal, prior to commencing construction activities,
  • copies of signed NOI’s are submitted to any municipal separate storm sewer system (MS4) receiving discharge, at least seven (7) days prior to commencing construction activities. Contractor shall list in the SWPPP the names and addresses of all MS4 operators receiving a copy.
  • copies of the Certified NOI’s are posted in a publicly accessible location (copies shall be laminated or placed in weather resistant display case),
  • and copies (Harris County & Primary Contractors) of construction site notice for large sites (CSN) are posted in a publicly accessible location. After construction activities are complete and final stabilization is achieved (as defined by the TPDES General Permit), the Contractor shall certify one Notice of Termination (NOT) form and provide it to Harris County. Harris County shall certify a second NOT form. Harris County shall submit the two NOTs to the TCEQ and the local storm sewer system operator. After the NOTs have been submitted to the TCEQ, then the Contractor shall remove all temporary SWPPP controls, cease SWPPP inspections, and deliver copies of all SWPPP records to the Engineer who shall archive them

 

for a minimum of three years. The final payment to the Contractor may be held until all SWPPP records are received by the Engineer.

 

SECTION 2. STORM WATER QUALITY MANAGEMENT PLANS

  1. COVERAGE

If this project meets the definition of “new development” or “significant redevelopment” as defined in the Harris County regulations or City of Houston ordinance on storm water quality and the project is not “grandfathered” or “exempt” as defined by the regulation or ordinance, then a Storm Water Quality Management Plan (SWQMP) is required for the project, as shown in the construction plans.

  1. CLASSIFICATION

This project is classified as one of three categories listed below. The Contractor shall be responsible for the storm water quality items, accordingly.

  1. “SWQ Permit Within Unincorporated Harris County”

If a Storm Water Quality Management Plan with permanent storm water quality controls is shown in the construction plans and the project is located in unincorporated Harris County, then a Storm Water Quality Management Plan is required prior to the start of construction. Prior to the start of construction, the Engineer shall submit the plans and Written Storm Water Quality Management Plan to the Harris County Permits Group and obtain the necessary signatures acknowledging acceptance of the Storm Water Quality Management Plan. The Contractor shall  construct the SWQMP structural controls in accordance with the construction plans, and maintain the SWQMP structural controls until completion of the project and until the Engineer can certify that the SWQMP structural controls are constructed in accordance with the plans.

 

or

  1. “SWQ Permit Within City of Houston”

If a Storm Water Quality Management Plan with permanent storm water quality controls is shown in the construction plans and the project is located in the jurisdiction of the City of Houston, then a Storm Water Quality Management Permit is required prior to the start of construction. Prior to the start of construction, the Engineer shall submit to the City of Houston the construction plans, the City of Houston Storm Water Quality Management Plan Application for Permit, and all other related documents shown on the permit application and obtain the Storm Water Quality Management Permit. Prior to the start of construction, the  Contractor  shall post a performance bond to the City of  Houston  for  the  construction of the storm water quality structural  controls.  The  Contractor shall post a copy of the issued permit on the project site, construct the SWQMP structural controls in accordance with the construction plans, and maintain the SWQMP structural controls until completion of the project and until the Engineer can certify that the SWQMP structural controls are constructed in accordance with the plans.

 

The Engineer shall submit the Storm Water Quality Permit As-built Certificate to the City of Houston and Harris County shall begin implementation of the SWQMP.

or

 

  1. “Grandfathered or Exempt from SWQ Permit” or “Storm Water Quality Bank”

If a Storm Water Quality Management Plan, or permanent storm water quality feature, is not shown in the construction plans, then a Storm Water Quality Management Permit is not required prior to the start of construction because it is grandfathered, exempt, or has provided storm water quality measures through the Storm Water Quality Bank.

SECTION 3. OTHER ENVIRONMENTAL ISSUES

  1. BIOLOGICAL ISSUES

In accordance with requirements under the federal Migratory Bird Treaty Act, if in the course of construction, a bird rookery, an identified special migratory bird habitat, or a nesting site is discovered on the project site, then the Contractor shall cease work in the area and immediately notify the Engineer.

 

In accordance with the Federal Endangered Species Act and the Texas Parks and Wildlife Code, if a biological mitigation plan for specially protected flora and fauna species has been provided within the construction plans, then the Contractor shall comply with all requirements noted within the plan.

  1. WATERS OF THE UNITED STATES INCLUDING ADJACENT WETLANDS

In accordance with Section 404 and Section 401 of the Clean Water Act and Section 10 of the Rivers and Harbors Act, waters of the United States including adjacent wetlands shall not be impacted by the Contractor unless a Department of the Army Permit has been obtained from the U.S. Army Corps of Engineers for the project.

 

If Harris County has obtained a Department of the  Army  Permit  for  this  project, a copy of the permit is  provided  in  the  project  manual.  The  Contractor shall comply  with  all  requirements  of  the  Department  of  the  Army Permit. The Contractor shall not impact any waters of the United States and adjacent wetlands greater than the area and volume shown in the permit. If the Contractor impacts waters of the United States including adjacent wetlands on the project site that exceeds the area and volume shown in the permit, then the Contractor shall be responsible for any violations that may be issued by the regulatory agencies. If the Contractor deems it necessary to impact waters of the United States including adjacent wetlands that exceed the permit, then the Contractor must first notify the Engineer and the Engineer may obtain the necessary regulatory clearances prior to allowing the additional impacts to occur.

 

During construction of the project, if the Contractor uses off-site areas  (not owned by Harris County) for placement of borrow material, disposal of construction debris, staging of construction materials, usage as a field office, or other types of construction related activities, then the Contractor shall be solely responsible for obtaining all environmental permits for the off-site activity, as well

 

as providing all environmental controls and compensatory mitigation requested by the permitting agency. If a regulatory violation occurs as a result of this off- site activity, then the Contractor shall be solely responsible for this violation.

  1. STATE OWNED SUBMERGED LANDS

The Contractor shall not impact submerged lands regulated under the authority  of the Texas General Land Office, or other local agency, without an easement agreement. If an easement agreement is necessary for the construction  activities, then the easement agreement shall be obtained by Harris County.

  1. CULTURAL RESOURCES

In accordance with the National Historic Preservation Act and the Antiquities Code of Texas, the Contractor shall not remove or disturb, or cause or permit to be removed or disturbed, any historical, archeological, architectural, or other cultural artifacts, relics, vestiges, remains, or objects of antiquity from the project site. In the event that such items are discovered on the project during construction activities, the Contractor shall immediately notify the Engineer. The site and the potentially significant material shall be protected by the Contractor from further disturbance until a professional examination of them can be made and/or until clearance to proceed with construction has been provided by the Engineer.

  1. HAZARDOUS AND PETROLEUM SUBSTANCES

If during the course of construction, the Contractor discovers hazardous or petroleum substances or wastes on the project site, then the Contractor shall immediately cease work in the area and remove all personnel from the area. The contractor shall temporarily close the area to the public, as well; temporary fencing or caution tape shall be installed around the area. The Contractor shall notify the Engineer immediately. Work in the area shall not be permitted until the Engineer has determined that safety and environmental issues have been properly addressed.

 

 

5

 

NOTICE OF SPECIFICATIONS

 

For the construction of this project, the Contractor shall use the attached Special Provisions, Special Specifications, and the Specification Book - SPECIFICATIONS FOR THE CONSTRUCTION OF ROADS AND BRIDGES WITHIN HARRIS COUNTY, TEXAS,

dated April 1988, with revisions through May 1, 2016.

 

The current specifications may be found at the Harris County Engineering Department (HCED) website www.eng.hctx.net.

 

When applicable, the Contractor shall use the Harris County Flood Control District (HCFCD) 2005 Standard Specifications Book. The current HCFCD specifications may be  found at  the HCFCD website: https://www.hcfcd.org/media/1311/hcfcd_2005_specifications.pdf.

 

When applicable, the Contractor shall also use the Texas Department of Transportation (TxDOT) 2014 Standard Specifications Book. The current TxDOT specifications may be found at the TxDOT website ftp://ftp.dot.state.tx.us/pub/txdot-info/des/spec-book-1114.pdf

 

 

When applicable, the Contractor shall also use the City of Houston’s Standard Specifications. The current specifications may be found at the City of Houston website http://edocs.publicworks.houstontx.gov/engineering-and-construction/specifications.html

 

 

ITEM 102 CLEARING AND GRUBBING

102.1                   Description. This Item shall govern for conducting clearing and grubbing operations within the project limits from right-of-way line to right-of-way line. For the purpose of this Item, the project limits  shall  include roadways, roadside ditches, channels, outfall ditches, detention ponds, and other drainage facilities, temporary and permanent easements and other areas as shown on the drawings. Clearing shall consist of removing all trees, brush, overhangs, logs, tires, appliances, trash, rubbish and other debris, including any deleterious materials, that exist within the limits of the project. Grubbing shall comply with the requirements of the third paragraph of Section 102.2 below.

 

It shall be the responsibility of the Contractor to visit the project site and ascertain the clearing and grubbing requirements as included in the bid documents prior to submitting a bid on the project. Any necessary trimming of overhangs that encroach into the right-of-way and interfere with the facilitation of construction or the operation or maintenance of the executed project shall be required and will not be paid for separately.

 

102.2                   Construction Methods. The project limits shall be cleared of all trees, brush, stumps, overhangs, logs, rubbish, shrubs, and other trash. Items and certain areas designated by the Engineer for preservation shall be carefully protected from abuse, marring or damage during construction operations and preserved in accordance with the bid documents.

 

Parking and/or servicing of equipment, or stockpiling of construction materials within 3 feet of the drip line of trees designated for preservation, will not be permitted.

 

On areas required for roadway, detention pond, channel, or structural excavation, grubbing shall be conducted to remove all stumps, roots, etc., to a depth of approximately 2 feet below the lower elevation of the excavation. On areas required for embankment construction, grubbing shall be conducted to remove all stumps, roots, etc., to a depth of approximately 2 feet below the existing ground surface. All holes remaining after clearing and grubbing shall be backfilled with suitable onsite material and compacted to 95 percent of Standard Proctor Density (ASTM Method D698) at a moisture content of between optimum and +/-  3 percent of optimum as directed by the Engineer and the entire area bladed to prevent ponding of water and to provide drainage; except in areas to be immediately excavated, the Engineer may direct that the holes not be backfilled. On areas required for borrow sites and material  sources, stumps, roots, etc., shall be removed to the complete extent necessary to prevent such objectionable matter becoming mixed with the material to be used in construction.

 

102.3                   Disposal of Materials. All cleared and grubbed materials shall  be disposed of offsite. The Contractor shall be responsible for obtaining any

 

 

necessary disposal permits. The Contractor shall not bury any refuse on Harris County property. The disposal site shall not be an environmentally sensitive area, “Waters of the United States”, wetland, or floodway. It is the responsibility of the contractor to contact the proper authorities to determine land use classification and to obtain any necessary permits. If the disposal site is defined in the plans, then the County shall be responsible for ensuring that the appropriate Department of the Army permit has been obtained for the activity, as necessary. No burning shall be allowed unless otherwise noted.

 

The Contractor shall refer to Item 560 “Maintenance and Cleanup of the Project Site” for schedule and frequency of cleanup of materials for disposal.

 

102.4                   Limit of Operation. No clearing or grubbing shall be done outside the Project limits or the right-of-way. Any work done outside the Project limits or the right-of-way limits, for any purpose, shall be done at the Contractor's expense and it shall be the Contractor's responsibility to negotiate and secure the permission of the property owner for such operation. The Contractor shall provide sufficient evidence to Harris County that such permission has been obtained.

 

102.5                   Schedule of Clearing. The Contractor shall schedule his clearing operations so that clearing has been completed for a distance of 2,000 feet ahead of any point where excavation is to be started. After starting excavation, the Contractor shall keep a minimum of 1,000 feet of cleared right-of-way ahead of the excavation operation.

 

102.6                   Measurement & Payment. Clearing and grubbing will be paid for at the unit price bid per lump sum, acre, or station (100 foot), as designated in the proposal and/or drawings, and shall be full compensation for  furnishing all labor, materials, permits, supervision, equipment and supplies required to complete all items of work specified herein.

 

Removal of concrete structures shall be measured and paid for in accordance with Item 104 “Removing Old Concrete” and Item 495 “Removing Old Structures”.

 

Tree protection and tree trimming shall be measured and paid for in accordance with Item 501 “Tree Protection and Trimming”.

There are line code(s), description(s), and unit(s) for this Item.

 

NOTE: This Item requires other Standard Specifications Item 104 “Removing Old Concrete”

Item 200 “Stripping”

Item 495 “Removing Old Structures” Item 501 “Tree Protection and Trimming”

Item 560 “Maintenance and Cleanup of the Project Site”

END OF ITEM 102

 

ITEM 104 REMOVING OLD CONCRETE

 

104.1                             Description. This Item shall govern for breaking up and satisfactorily disposing of concrete pavement, slope paving, riprap, median strips, driveways, sidewalks, combined curb and gutter, or curb.

 

104.2                             Construction Methods. Existing concrete to be disposed of, consisting of pavement, slope paving, riprap, median strips, driveways, sidewalks, combined curb and gutter or curb, shall be removed and legally disposed of offsite. The use of explosives for breaking up old concrete will not be permitted, unless authorized by the Engineer, and when so authorized, adequate precautions shall be given to prevent damage to adjacent property. Reinforcing steel shall be cut as necessary for satisfactory disposal.

 

Where only a portion of the existing concrete is to be removed, special care shall be exercised to avoid damage to that portion of the concrete to remain in place. The existing concrete shall be cut to the  neat lines  shown on the plans or established by the Engineer and any existing concrete, beyond the neat lines so established, which is damaged or destroyed by these operations shall be replaced at the Contractor's entire expense. Saw-cutting, full depth or as shown on the drawings, will be required and shall be incidental to the removal of old concrete.

 

Where indicated on the plans, old concrete which is removed shall be loaded, hauled and disposed of at permitted locations outside the project limits, or used as needed for riprap onsite. Broken concrete reused as riprap onsite will be incidental to this Item. The Contractor shall provide  the disposal locations and the total quantity of all excavated material, and the total quantity of disposed material. The disposal site shall not be an environmentally sensitive area, “Water of the United States”, wetland, or floodway. It is the responsibility of the Contractor to contact the proper authorities to determine land use classification and to obtain any necessary permits. If the disposal site is defined in the plans, then the County shall be responsible for ensuring that the appropriate Department of the Army permit has been obtained for the activity, as necessary.

 

Work performed under this Item shall be initiated at such time and prosecuted in such a manner as to cause a minimum of inconvenience to traffic or adjacent property owners.

 

104.3                             Measurement. Existing concrete pavements with or without curbs, slope paving, driveways, sidewalks, median strips, and riprap, removed as prescribed above, will be measured by the square yard in its original position, regardless of its thickness or the depth of covering.

 

Existing combined concrete curb and gutter and concrete curb, not on concrete pavement, removed as prescribed above will be measured by

 

the linear foot in its original position, regardless of the dimensions of same. Monolithic concrete curb or doweled-on concrete curb will be considered as part of the concrete pavement to be removed and will not be measured separately.

 

104.4                             Payment. The work performed as prescribed by this Item, measured as provided under "Measurement" will be paid for at the unit price bid for "Removing Old Concrete" (of the type specified), which price shall be full compensation for:

 

  • Full depth saw-cutting or
  • Partial depth saw-cutting and breaking up the concrete,

cutting reinforcing steel when required, loading, hauling and disposing of the material offsite and for all labor, tools, equipment, manipulations and incidentals necessary to complete the work.

 

There are line code(s), description(s), and unit(s) for this Item. NOTE: This Item requires other Standard Specifications

Item 205 “Subgrade”

 

END OF ITEM 104

 

 

ITEM 120

EXCAVATION FOR CHANNELS AND OTHER DRAINAGE FACILITIES

 

NOTE: This  item  is  intended  for  use  for  constructing  drainage  facilities which will not be maintained by the Harris County Flood Control District. Facilities for Flood Control maintenance are governed by  the applicable HCFCD standards.

 

120.1                             Description. This Item shall govern the required excavation for all channels, detention ponds, and other drainage facilities, channel changes and ditches as shown on the plans, the removal and proper stockpiling or disposal of all excavated materials; including strippings on the entire length of channel or drainage facility, in conformity with the required lines, grades and typical sections and in accordance with the specification requirements herein outlined. Stripping is unsuitable material. Excavation for roadways and roadside ditches are specifically excluded. Ditches shall include inlet and outlet ditches to structures, and all ditches outside the confines of the roadway slopes. This excludes constructing embankment for channels and ditches shall be as outlined under the Item 132 “Embankment”.

 

120.2                             Construction Methods. All suitable materials removed from  the  excavation shall be used, insofar as practicable in the formation of embankments as required by the Item 132 “Embankment”. Excavated material shall neither be permanently nor temporarily placed on the channel top of bank, nor will temporary shelves be cut into the channel side slopes, without the approval of the Engineer. All channel excavation utilized as embankment shall be placed in accordance with Item 132 “Embankment”.

 

Unsuitable and/or excess excavation shall become the property of the Contractor and shall be disposed of by the Contractor outside of the limits of the right-of-way. The Contractor shall be responsible for disposal of all excavated material not used for backfill or grading berm areas. The disposal site shall not be an environmentally sensitive area, “Water of the United States”, wetland or floodway. It is the responsibility of the Contractor to contact the proper authorities to determine land use classification and to obtain any necessary permits. Refer to Section 120.3 regarding Disposal Permits. However, if the disposal site is defined in the plans, then the County shall be responsible for ensuring that the appropriate Department of the Army permit has been obtained for the activity.

 

Cut-off channel meanders shall not be backfilled unless so indicated on the plans.

 

Any temporary construction access that crosses a channel shall be constructed so as to allow a continuous flow at all times.  The channel  flow line shall not be blocked or raised at any temporary construction access. Temporary construction access across a channel shall require a permit. If a permit is not included in the contract, the Contractor is not entitled to construct such access without securing a required permit.

 

When the plans indicate the fill of a channel side slope, the earthen fill material shall be placed in layers not to exceed 8 inches and shall be benched or notched into existing slopes and compacted by suitable rolling equipment to 90 percent of standard proctor density, per ASTM D698, “Laboratory Compaction Characteristics of Soil Using Standard Effort of 12,400 ft-lbf/ft3 (600 kN-m/m3)” at a moisture content between +/- three percent of optimum.

 

Any earthen fill material, whether from onsite sources or imported, shall  be free from roots, trash, silt and objectionable debris. Soils classified by ASTM D2487, “Classification of Soils for Engineering Purposes” as clayey sands (SC), sand clay mixtures, or inorganic clays (CL) with a plasticity index from 15 to 40 are approved as fill materials. Each layer shall be compacted to 90 percent of standard proctor density (ASTM D698), at a moisture content between +/- three percent of optimum. The channel side slopes, in fill areas, shall be cut to the finished dimensions after completion of the fill process. Any imported earthen fill material shall comply with Item 130 “Borrow”.

 

At the location of pipeline crossings, the Contractor shall  suspend machine excavation at a location five feet before reaching the pipeline right-of-way, until a company representative is present to identify pipe location and to further direct excavation operations. The notification to the pipeline company of the Contractor's operations and the request for their representative’s attendance shall be the responsibility of the Contractor. The Contractor shall not be reimbursed directly for any work or expenditure as a result of intersecting any pipeline operation. Any contingent costs therefore shall be anticipated in the preparation of the bid and included as distributed items of cost in the price for channel excavation.

 

At locations where lateral ditches or swales enter the channel, the Contractor shall perform grading as may be required to maintain the lateral ditches or swales within the easement area as approved by the Engineer. The cost of all grading shall be considered incidental to the unit price bid and no extra payment will be made.

 

Prior to final inspection by the Engineer, the Contractor shall remove all sediment from the bottom of the channel and dispose of this material off site. The cost of sediment removal and grading shall be incidental to the unit price bid, and no extra payment will be made.

 

120.3                             Disposal Permits.       The Contractor shall provide copies of the disposal permits to the County and post all disposal location permits on the jobsite.

 

120.4                             Measurement & Payment. The quantity of excavation for channels and other drainage facilities shall be paid for by the number of cubic yards of material computed by theoretical cross-sections, obtained from the drawings and natural ground lines using the average end area method. Field cross-sections will not be performed after construction has begun. Excavation in Storm Water Quality basins and created wetlands may be paid for per cubic yard or per acre as stipulated in the bid proposal and/or drawings.

 

After project award, if the Contractor feels there is an error in the estimated quantities for excavation, as shown on the bid sheet, the plan quantity may be protested as delineated in Item 110.4 “Contesting Earthwork Quantities”.

 

All work performed as required by this Item and measured as provided above, will be paid for at the unit price bid for excavation for channels and other drainage facilities which price shall be full compensation for preparation, trimming of slopes, storage and hauling of excavated material for other uses, disposal of surplus materials (wastage), any necessary hauling and the furnishing of all labor, tools, equipment and incidentals necessary to complete the work, as shown on the drawings.

 

There are line code(s), description(s), and unit(s) for this Item. NOTE: This Item requires other Standard Specifications

Item 110 “Roadway Excavation” Item 130 “Borrow”

Item 132 “Embankment”

Item 200 “Stripping”

 

END OF ITEM 120

 

 

ITEM 130 BORROW

 

130.1                   Description. This Item shall govern proper utilization of fill materials secured from offsite sources obtained by the Contractor and approved by the Engineer. Compaction of borrow shall conform to the density control method as outlined in the Item 132 “Embankment”.

 

Borrow shall be used only when there is an insufficient quantity of suitable onsite material available as outlined by Item 132 “Embankment”. Borrow shall be used only as authorized by the Engineer, and shall be supplied from approved sources only.

 

130.2                   Materials. Borrow material used for embankment shall consist of soil having a plasticity index not less than 12, nor more than 20 when tested in accordance with ASTM D4318, “Standard Test Methods for Liquid Limit, Plastic Limit and Plasticity Index of Soils” or as directed by the Engineer. The maximum liquid limit allowed is 45, unless otherwise approved by the Engineer. The Contractor is required to inform the Engineer of the  location of the pit or pits from which the fill material is to be taken and  shall provide samples of the material for approval by the Engineer. In the event the material is not acceptable, as determined by the Engineer, the Contractor shall find other pit locations. All fill material shall be free from organic matter and deleterious material.

 

The use of a blend of cohesive and granular soils to achieve the required plasticity index will not be permitted.

 

130.3                   Construction Methods. All suitable material obtained onsite and/or from borrow sources shall be used in the formation of embankments as required by the Item 132 "Embankment", or shall otherwise be utilized as indicated on the plans or as directed, and the completed work shall conform to the established alignment, grades and cross-section.

 

The Engineer shall be notified sufficiently in advance of opening any approved borrow source to permit necessary testing, prior to the use of the material as borrow.

 

The borrow site shall not be located within a “Water of the United States” or environmentally sensitive area. It is the Contractor’s responsibility to obtain any and all Federal, State or Local permits associated with operation of the borrow site; if it is not an approved commercial borrow site.

 

 

County Borrow Source.

 

During construction, the borrow source shall be kept drained, insofar as practicable, to permit final cross-sections to be taken when required.

 

The borrow source shall be left in a suitable condition, so as to provide proper drainage where practicable.

 

130.4                 Measurement and Payment. Borrow is a plan quantity pay item that represents the excess embankment needed over the total excavated material from all onsite sources. These sources include, but may not be limited to:

  • “Roadway Excavation” (Item 110),
  • “Detention Pond and/or Channel Excavation” (Item 120),
  • storm sewer excavation,
  • and/or “Structural Excavation” (Item 441).

 

“Roadway Excavation” and “Detention Pond and/or Channel Excavation” are calculated by cross sections using the average end area method, whereas storm sewer excavation and “Structural Excavation” are volumetrically calculated.

 

After project award, if the Contractor feels there is an error in the estimated quantities for excavation, as shown on the bid sheet, the plan quantity may be protested as delineated in Item 110.4 “Contesting Earthwork Quantities”.

 

All work performed as required herein and measured as provided above, will be paid for at the unit price bid for “Borrow”, which price shall be full compensation for furnishing all labor, for all materials, for all royalties and freight involved, for all hauling, delivery and spreading on the road and compacting complete and in place and for all tools, equipment and incidentals necessary to complete the work.

 

There are line code(s), description(s), and unit(s) for this Item. NOTE: This Item requires other Standard Specifications

Item 110 “Roadway Excavation”

Item 120 “Detention Pond and/or Channel Excavation” Item 132 “Embankment”

Item 205 “Subgrade”

Item 441 “Structural Excavation”

END OF ITEM 130

 

 

 

ITEM 162

SODDING FOR EROSION CONTROL AND STABILIZATION

 

162.1                   Description. This Item shall govern for providing and planting Bermuda grass, St. Augustine grass, or other acceptable sod along or across such areas as are designated on the drawings and in accordance with the specification requirements herein outlined.

 

162.2                   Materials. The sod shall consist of living, growing Bermuda grass, St. Augustine grass, or other acceptable sod, (ninety-five percent pure), secured from sources where the soil is fertile and has been fumigated. The sod shall have a healthy virile root system of dense, thickly matted roots throughout. The sod shall be cut from the field so that there is a minimum of 1/2 inch of soil on the roots of the sod, and so that no roots show on the bottom of the soil. Sod shall be dense, with the grass having been mowed to 1 inch height before lifting from field. Sod shall be in a vigorous condition, dark green in color, free of disease and harmful insects. The Contractor shall not use sod from areas where the grass is thinned out, nor where the grass roots have been dried out by exposure to the air and sun to such an extent as to damage its ability to grow when transplanted. The sod shall be free from obnoxious weeds or other grasses and shall not contain any matter deleterious to its growth or which might affect its subsistence or hardiness when transplanted. Unless the area has been closely pastured, it shall be closely mowed and raked to remove all weeds and long-standing stems.

 

Care shall be taken at all times to retain the native soil on the roots of the sod during the process of excavation, hauling and planting. Sod material shall be kept moist from the time it is dug, until planted. When so directed by the Engineer, the sod existing at the source shall be watered to the extent required, prior to excavating. Do not stack sod for more than 36 hours between the time of cutting and the time of installation. The Engineer reserves the right to reject any sod deemed unacceptable for installation.

 

All planting shall be done between the average date of the last freeze in the spring and six weeks prior to the average date for the first freeze in  the fall, according to the U.S. Weather Bureau.

 

Fertilizer shall conform to the requirements of the Item 166 "Fertilizer" and shall be applied at the rate of 480 pounds per acre.

 

162.3                   Construction Methods. Immediately after the finished grade has been approved, begin sodding operations to reduce excessive weed growth. If the sod bed is dry, immediately prior to sod installation, dampen the surface with a fine mist of water.

 

 

Grass shall be turf sod, cut into 16 inch strip widths for those areas behind a curb. All other areas can receive various cut widths and lengths.

 

All areas to be sodded shall be raked to true lines, free from all unsightly variations, bumps, ridges or depressions. All sticks, stones, roots or other objectionable material which might interfere with the formation of a finely pulverized sod bed, shall be removed from the soil.

 

Lay sod so that adjacent strips butt tightly, with no spaces between strips. Lay sod on mounds and slopes, with strips parallel to contours. Stagger joints. Sodded areas shall be flush with adjoining seeded areas. All sod shall, of course, be laid green side up. Tamp and roll the sod thoroughly  to make contact with the sod bed, or as directed by the Engineer.

 

Peg sod on slopes three-to-one or steeper with pegs driven through sod into soil, until pegs are flush with the turf. Space pegs 18 inches on  center. Pegs to be 1 inch square, 6 inches long or, 6 inch lengths of lath.

 

Commercial fertilizer as outlined in the Item 166 "Fertilizer" shall be applied to the entire sodded area at the prescribed rates, immediately following laying the sod. Immediately after fertilizing, water the entire area until a saturated depth of 2 inches has been reached. If rain is imminent, then the application of fertilizer shall be postponed until weather  conditions exist such that the potential for the runoff of fertilizer from the site is minimized.

 

Immediately after installation of the sod, remove sod clumps, soil, and any plant material from roadways and pavements. Edges along curbs and drives, walkways, etc., shall be carefully trimmed and maintained until accepted.

 

In areas where sod is dead, satisfactory growth may be accomplished with application of seeding or hydromulch seeding in lieu of replacing the dead sod, only as approved by the Engineer. Costs for labor, materials, tools and equipment for the application of seeding or hydromulch seeding over dead sod shall be incidental to this pay item.

 

162.4                   Contractor's Maintenance & Guarantee Period. It shall be the responsibility of the Contractor to maintain all sodded areas until satisfactory growth has occurred as determined by the Engineer and for a period of 60 days after the successful completion of all punch list items. Maintenance shall consist of watering, weeding, repairing of all erosion, and resodding as necessary to establish a uniform growth of the specified grass. A minimum of 95 percent of the area planted shall be covered with the specified grass with no bare or dead spots greater than 10 square feet.

 

The Contractor shall be responsible for 1 mowing per month between the months of April to October. The Contractor shall also be responsible for 1 mowing every 6 weeks between the months of November to March.

 

 

In addition, the Contractor shall water all sodded areas as often as necessary to establish satisfactory growth and to maintain its growth throughout the duration of the project; including in the 60 day period described above.

 

Contractor shall make as many repeat plantings as necessary to achieve a minimum of 95 percent of the area planted covered with the specified grass with no bare or dead spots greater than 10 square feet. Such replanting is to be performed within 14 calendar days of notification by the Engineer.

 

162.5                   Submittal Required. The Contractor shall submit a statement from the supplier attesting that the sod meets the requirements stated herein.

 

162.6                   Measurement. Work and acceptable material for Sodding for Erosion Control and Stabilization shall be measured by linear feet (with standard width of 16 inches behind curb), or by the square yard (for various widths), complete in place.

 

162.7                   Payment. Work performed and material furnished under "Measurement" shall be paid for at the unit price bid for “Sodding for Erosion Control and Stabilization”, which price shall be full compensation for furnishing materials, preparation of ground for planting, planting of sod, pegging of sod, raking, fertilizing, watering, sprinkling, maintenance, mowing, and for labor, tools, equipment and incidentals necessary to complete the work. Additional payment shall not be made for those areas that are replanted.

 

There are line code(s), description(s), and unit(s) for this Item. NOTE: This Item requires other Standard Specifications.

Item 166 “Fertilizer”

Item 725 “General Source Controls”

END OF ITEM 162

 

ITEM 165

HYDRO-MULCH SEEDING

(FOR EROSION CONTROL AND STABILIZATION)

 

165.1                             Description. This Item shall govern for furnishing all labor, materials, equipment, supplies, supervision and tools and performing all work necessary to:

  • seed,
  • fertilize,
  • water,
  • maintain, and
  • cleanup of side slopes and finished grades,

in accordance with these Standard Specifications, for the purpose of temporary erosion control or final stabilization.

 

The hydro-mulch seeding operations, together with all necessary related work, shall conform to the requirements specified in this section. The area(s) to be hydro-mulch seeded shall be as shown on the construction drawings.

 

165.2                             Materials. Seed shall comply with the U. S. Department of Agriculture Rules and Regulations – Federal Seed Act. Seed bags shall have tags affixed for inspection in the field. Bags without tags will be rejected. Seed shall be tested and certified by a commercial or state laboratory not more than nine (9) months prior to the date of planting. Tags on seed bags  shall show the name of the seed, locality and year of harvest, percentage purity, germination and dormant seed, Johnson grass content and noxious weed content. Seed shall be provided in clean, unopened and  undamaged bags. Seed(s) shall be provided with no objectionable material, such as sticks, stems and unthrashed seed heads, which will hinder proper distribution.  Seed that is wet, moldy, starting to germinate or otherwise damaged, will not be accepted by Harris County.

 

Standard seed plan, planting Dates, plant species and seeding rate are as shown on Table 1:

 

TABLE 1

Seed

Plan

Planting Dates

Species

Planting Rate

Per Acre

1

Oct. 1- March 31

When soil temperatures fall below 75°F, or as directed.

Unhulled Bermuda Grass Tall

Fescue and

Durana Clover Crimson Clover

50 lbs.

25 lbs.

 

5 lbs. 5 lbs.

2

April 1-Sept. 30 When soil temperatures rise

Certified Bermuda Grass* Or

Common Bermuda Grass,

50 lbs. or

50 lbs. PLS

 

 

above 65°F, or as directed

minimum purity/germination of 95/85

Millet

 

 

10 lbs.

3

As directed

Certified Bermuda Grass Or

Hulled Bermuda Grass minimum purity/germination 95/85

and Pensacola Bahia Grass Brown Top or Fox Tail Millet

50 lbs. or

50 lbs. PLS and

 

20 lbs.

20 lbs.

5

As directed

Annual Ryegrass and Fescue Or Millet

25 lbs. each

25 lbs.

6

As directed

Improved Bermuda Grass Cultivars

50 lbs.

7

As directed

Legume or Grain

20      lbs.

 

Seeding shall be applied in accordance with the following:

  • Planting dates are approximate, Harris County will determine which seed to use prior to start of seeding
  • Seeding rate for “PureLive Seed”. Is used to determine the actual application rate of bulk material to obtain.
  • PLS= (%germination X % purity) 95 x85 = 80.7%PLS
  • Rate/PLS= LBS of seed neede d for application 1/. 807= 1. 24 lbs of seed needed/1000 SF
  • Certified Bermuda must have a Blue Tag and tested by an accredited seed testing lab

Commercial fertilizer as outlined in the Item 166 “Fertilizer”, shall be applied to the entire seeded area at the prescribed rates. The fertilizer shall be delivered to the site in bags or other convenient containers, each fully labeled, conforming to the applicable State Fertilizer Laws and bearing the name and warranty of the producer.

 

Mulch shall be virgin wood cellulose fiber made from whole wood chips. Rate of application shall be 2000 pounds per acre.  Soil stabilizers shall  be applied at a rate of 40 pounds per acre. On side slopes Terra Type III (or approved equal) shall be used. On all other areas Terra Tack I (or approved equal) shall be used. Alternatively, Ultra Bond 2002 (or approved equal) shall be applied at a rate of one gallon per square yard in three applications. First application shall be at a rate of 1/2 gallon per square yard followed by another application in about two weeks at a rate of 1/4 gallon per square yard. The third application shall follow in about two months at a rate of 1/4 gallon per square yard. The concentrate shall be diluted in 1:5 ratio with water or as recommended by the manufacturer.

 

Wood cellulose fiber mulch, for use in the grass seed and fertilizer, shall be processed in such a manner that it will not contain any germination or growth inhibiting factors. It shall be dyed an appropriate color to allow visual metering of its application.  The wood cellulose fibers shall have the

 

property of becoming evenly dispersed and suspended when agitated in water. When sprayed uniformly on the surface of the soil, the fibers shall form a blotter-like ground cover which readily absorbs water and allows infiltration to the underlying soil. Weight specifications from suppliers,  shall refer only to the air dry weight of the fiber. The mulch material shall be supplied in packages having a gross weight not greater than 100 pounds and must be marked by the manufacturer to show the dry weight content. Suppliers shall be prepared to certify that laboratory and field testing of their product has been accomplished and that it meets all of the preceding requirements.

 

Water shall be free from oil, acid, alkali, salt and other substances harmful to the growth of grass. The water source  shall be subject to approval, prior to use.

 

165.3                             Execution. Immediately after the finished grade has  been  approved, begin hydro-mulching operations to reduce erosion and excessive weed growth.

 

Hydraulic equipment used for the application of fertilizer, seed and slurry of prepared wood fiber mulch shall have a built-in agitation system with an operating capacity sufficient to agitate, suspend and homogeneously mix  a slurry containing up to 40 pounds of fiber plus a combined total of 70 pounds of fertilizer solids for each 100 gallons of water. The slurry distribution lines shall be large enough to prevent stoppage. The  discharge line shall be equipped with a set of hydraulic spray nozzles which provide even distribution of the slurry on the area to be seeded.  The slurry tank shall have a minimum capacity of 800 gallons and shall be mounted on a traveling unit, which may either be self-propelled or drawn with a separate unit which will place the slurry tank and spray nozzles within sufficient proximity to the areas to be seeded, so as to provide uniform distribution without waste. The Engineer may  authorize equipment with a smaller tank capacity, provided the equipment has the necessary agitation system and sufficient pump capacity to spray the slurry in a uniform coat.

 

Slurry preparation shall take place on the worksite. The slurry preparation should begin by adding water to the tank when the engine is at half throttle. When the water level has reached the height of the agitator shaft, good re-circulation shall be established and seed shall be added.  Fertilizer shall then be added, followed by wood pulp mulch. The wood pulp mulch shall only be added to the mixture after the seed and when the tank is at least one-third filled with water. The engine throttle shall be opened to full speed when the tank is half filled with water. All the wood pulp mulch shall be added by the time the tank is two-thirds to three- fourths full. Spraying shall commence immediately when the tank is full. The operator shall spray the area with a uniform visible coat, by using the green color of the wood pulp as a guide.

 

165.4                             Application. The Contractor shall obtain approval of hydro-mulch area preparation from the Engineer prior to application. If rain is imminent,

 

then the application of hydromulch seeding and fertilizer shall be postponed until weather conditions exist such that the potential for the runoff of the slurry and fertilizer from the site is minimized.

 

Operators of hydro-mulching equipment shall be thoroughly experienced in this type of application. Apply the specified slurry mix to form a uniform mat at the specified rate. The Contractor shall avoid getting the hydromulch on paved areas. Keep paved and planting areas clean during maintenance operations. Contractor shall confine hydro-mulching within the areas designated on the plans and keep it from contact with other plant material. Immediately after application, thoroughly wash off any plants, planting areas or paved areas not intended to receive slurry mix.

 

If the Engineer notes any unmulched areas after hydro-mulching, the Contractor shall be required to seed the unmulched areas with the grasses that were to have been planted at no additional cost to Harris County.

 

165.5                             Contractor's Maintenance & Guarantee Period. It shall be the responsibility of the Contractor to maintain all hydromulch seeded areas until satisfactory growth has occurred as determined by the Engineer and for 60 days after the successful completion of all punch list items. Maintenance shall consist of watering, weeding, repairing of all erosion, and reseeding, as necessary to establish a uniform stand of the specified grasses. A minimum of 95 percent of the area seeded shall be covered with the specified grass with no bare or dead spots greater than 10 square feet.  The Contractor shall make as many repeat seedings as necessary  to achieve the required level of coverage. Such reseeding is to be performed within 14 calendar days of notification by the Engineer.

 

The Contractor shall be responsible for 1 mowing per month in the months of April through October. The Contractor shall also be responsible for 1 mowing every 6 weeks in the months of November through March. In addition, the Contractor shall water all grassed areas as often as necessary to establish satisfactory growth and to maintain its growth throughout the duration of the project; including the 60 day period after  the punch list is completed as described above.

 

165.6                             Submittal Required. The Contractor shall submit copy of seed tag(s) and letter from the supplier attesting that the seed meets the requirements as stated herein. Certification shall include common name; botanical name, percent by weight of each plant species; year of harvest; percent purity, germination and dormant seed; percent noxious weed content; and date  of certification. The Contractor shall certify on the application of the project.

 

165.7                             Measurement. The unit of measurement for all work performed and materials furnished, as described herein, shall be by the acre or per station as indicated in the bid documents. Measurement shall be done upon completion of the work performed within the limits shown on the

 

drawings and as described herein. The area measured for payment will  be computed to the nearest 1/10 acre or station.

 

165.8                             Payment. Payment for hydro-mulch seeding will be made at the contract unit price per acre or per station and includes final grading, mulch, seed, fertilizer, watering, maintenance and clean-up. Additional payment shall not be made for those areas that are reseeded as provided in Section 165.5 above.

 

 

There are line code(s), description(s), and unit(s) for this Item. NOTE: This Item requires other Standard Specifications.

Item 166 “Fertilizer”

Item 725 “General Source Controls”

END OF ITEM 165

 

 

ITEM 433

CEMENT STABILIZED SAND BEDDING AND BACKFILL MATERIAL

 

433.1                   Description. This Item shall govern for cement stabilized sand to be used for backfill and bedding as called for on the Standard Civil Drawings, in other parts of the Standard Specifications, or as directed by the Engineer.

 

433.2                   Materials. Cement shall be Type I Portland cement conforming to ASTM C150.

Sand shall be clean durable sand containing not more than the following:

  1. Deleterious Materials

 

Clay lumps, when tested in accordance with ASTM C142 shall be less than 0.5 percent.

 

Lightweight pieces, when tested in accordance with ASTM C123 shall be less than 5.0 percent.

 

Organic impurities when tested in accordance with ASTM C40, shall not show a color darker than the standard color.

 

  1. The plasticity index shall be 6 or less when tested in accordance with ASTM D4318.

 

  1. Sand shall be free of organic matter and deleterious substances and shall meet the following gradation requirement.

Square Sieve Size               Percent Passing, By Weight 3/8"                                               100%

No. 200                                            5 - 30%

 

Water shall be clean and clear, free of oils, acids, alkalis, organic matter or other deleterious substances and shall conform to the requirements of ASTM C94.

433.3                   Sand-cement Mixture Product. The mixture shall consist of not less than

1.5 sacks of Portland cement per ton of material mixture as placed. The mixture shall contain sufficient water to hydrate the cement.

 

The cement, sand and water shall be mixed in a pugmill type mixer, which meets the approval of the Engineer. It shall be mixed for a minimum period of two minutes per batch.

433.4               Submittals and Responsibilities of the Contractor:

 

 

  1. Submit the proposed design mix and test data for cement  stabilized sand mixture.

 

  1. Facilitate testing and inspection, by furnishing  any  necessary  labor to assist the designated Testing  Laboratory  in  obtaining  and handling samples at the project site.

 

433.5                   Placing. The sand cement mixture shall be placed in maximum 8 inch thick lifts, loose measure around the pipe, boxes, structures, bridge approaches and paving sections. Placement and compaction shall be performed in a manner that will thoroughly fill all voids without placing undue strain on or displacement of the structure.

 

Cement stabilized sand backfill placed below the top of  sewers, manholes, inlets or other structures shall be placed equally along all sides of the structure. Cement stabilized sand backfill/bedding shall be placed  in a manner that will completely fill all voids in the trench. Hand operated tampers may be used for compaction.

 

Materials not placed and compacted within 4 hours after mixing shall be rejected. Do not place or compact sand-cement mixtures in standing or free water.

 

Cement stabilized sand bedding and backfill placed in trenches shall be compacted in accordance with Item 430 “Construction of Underground Utilities” and Item 480 “Precast Reinforced Concrete Box Sewers.”

 

Provide excavation and trench safety system at locations and depths required for testing and retesting during construction, at no additional cost to Harris County.

 

In-place density tests shall be taken at each location, each day, to test the placement of bedding/backfill material. The minimum number of tests per day shall be 1 in-place density on the bedding and 2 in-place densities on backfill. The minimum number of tests shall be for each location at the  rate of 1 in-place density test per 50 linear feet of bedding and 1 in-place density test per 50 linear feet of backfill per lift placed above the top of pipe. In-place densities shall be determined in accordance with ASTM D6938 or ASTM D1556 and ASTM D3017.

 

433.6                   Performance. The sand cement mixtures shall produce a minimum unconfined compressive strength of 100 psi in 48 hours, when compacted to 95 percent of Standard Proctor density (ASTM D558), without  additional moisture control and when cured in plastic bags at a temperature of 73.4º F. at plus or minus 3º F. and tested in accordance with ASTM D1633.

 

Random samples of the delivered product will be taken in the field at the direction of the Engineer and tested at Harris County's expense. A minimum of 1 sample per week shall be taken at random to represent a production that is less than 100 tons per week. Two samples per week

 

 

shall be taken at random to represent a production greater than 100 tons per week. The Engineer shall have the option to obtain  additional samples for testing.

 

After the molding of the soil-cement cylinders, the specimens will be tested in accordance with ASTM D1633, Method A. Two specimens will  be tested at 48 hours and two specimens will be tested at 7 days.

 

433.7                   Notification. The Testing Laboratory’s representative will notify the  County, Engineer, Contractor and material supplier by facsimile of all tests indicating results falling below specified strength requirements.

 

433.8                   Measurement. Cement stabilized sand shall be measured by the square yard of material, furnished and compacted in place to the thickness specified, or as shown in the plans or acceptable material mixture, as specified by this Item, shall be measured by the ton of 2,000 pounds. Measurement shall be made by tickets delivered to the Engineer. The  dray tickets shall indicate the tare, gross and net weight of the load and the location of delivery.

 

433.9                   Payment.

 

  1. The payment for cement stabilized sand, complete and in place, shall be at the contract unit price per square yard of the specified thickness, which unit price shall include all costs of materials, furnished, hauled, dumped, spread, shaped, and compacted.

 

  1. Where the bid sheet specifies FOB the plant, the materials shall be loaded on Harris County vehicles and paid for by the ton of 2,000 pounds.

 

  1. Where the bid sheet specifies FOB the job, materials shall be transported to the job site specified on the bid sheet, and paid for by the ton of 2,000 pounds.

 

  1. When the Project Manual, plans or other specifications indicate the use of cement stabilized sand is incidental to another pay item, no direct payment for the material will be made.

 

There are line code(s), description(s), and unit(s) for this Item. NOTE: This Item requires other Standard Specifications

Item 430 “Construction of Underground Utilities”

Item 480 “Precast Reinforced Concrete Box Sewers”

END OF ITEM 433

 

 

ITEM 434 FLOWABLE FILL

 

434.1                   Description. This Item shall govern for flowable fill to be used as backfill for construction of underground utilities, as called for on the drawings, or in other parts of the specifications. This material may be used in lieu of cement stabilized sand, at the option of the Engineer.  Because of the  time required for "setting up", this material can only be used at locations where the trench can be left open for approximately twelve hours prior to backfilling. Shoring for excavations and trenches shall meet the requirements of the latest edition of OSHA Regulation 1926, Subpart P.

 

434.2                   Materials. Cement shall be Type I Portland cement conforming to ASTM C150.

 

Fly ash shall meet the requirements of ASTM C618, Class C.    Fly ash shall have a minimum CaO content of 20 percent.

Sand shall be clean, durable sand containing not more than the following:

  1. Deleterious Materials

 

Clay lumps, when tested in accordance with ASTM C142, shall be less than 0.5 percent.

 

Lightweight pieces, when tested in accordance with ASTM C123, shall be less than 5.0 percent.

 

Organic impurities, when tested in accordance with ASTM C40, shall not show a color darker than the standard color.

 

  1. The plasticity index shall be 6 or less when tested in accordance with ASTM D4318.

 

  1. Sand shall be free of organic matter and deleterious substances and shall meet the following gradation requirement:

Percent Passing,

Square Sieve Size                                 by Weight

3/8"                                                   100%

No. 200                                              0 - 10%

 

Note: It is intended that the sand be a fine sand that will stay in suspension, in the mixture, to the extent required to obtain a flowable consistency. The gradation shall be adjusted to achieve this consistency.

 

 

Water shall be clean and clear, free of oils, acids, alkalis, organic matter, or other deleterious substances and shall conform to the requirements of ASTM C94.

Admixtures shall conform to ASTM C1017 and/or C494.

 

434.3                   Mix Design. The following are given as typical mix designs for trial mixes. Adjustments of the proportions may be made to achieve proper solid suspension and optimum flowability. Admixtures may be used, if desired, to improve the characteristics of the mix. The suggested quantities of dry material per cubic yard are as follows:

Trial Mix No. 1

 

Cement 100 lbs. Fly Ash 250 lbs. Sand 2800 lbs.

Water (approx.) 60 gals.

Trial Mix No. 2

 

Cement 100 lbs. Fly Ash 300 lbs. Sand 2600 lbs.

Water (approx.) 70 gals.

 

The above quantities will give an approximate yield of one  cubic yard. The flowability of the mixture shall be observed by the Engineer and flowability increased/ decreased by adjusting the water content as well as increasing/decreasing the air entraining admixture content.

Provide a mix design per TxDOT’s Specification Item 401 “Flowable

 Backfill”, Latest Edition.

 

434.4                   Consistency. The consistency of the mix shall be tested by filling an open-ended 3 inch diameter cylinder 6 inches high, to the top with flowable fill. The cylinder shall be immediately pulled straight up and the correct consistency of the flowable fill shall produce a minimum 8 inch diameter circular type spread, with no segregation. The flowable fill shall maintain its consistency when placed.

 

434.5                   Batching, Mixing, and Transportation. Materials are to be measured by weight. The flowable fill may be mixed in a central concrete mixer, a  ready mix truck, or other means acceptable to the Engineer. The flowable fill shall be transported to the point of placement in a revolving drum mixer or in an agitator unit.

 

434.6                   Placement. The flowable fill shall be placed by direct discharge from the mixer truck, or other approved methods. If necessary to prevent segregation, boots shall be used.

 

 

The flowable fill shall be placed in accordance with Item 430 "Construction of Underground Utilities" and Item 480 "Precast Reinforced Concrete Box Sewers". It will be necessary to use cement stabilized sand as bedding,  as shown by the Standard Civil Drawing. At the option of the Engineer,  the flowable fill may be used above the bedding to the uppermost elevation shown on the referenced drawings.

 

434.7                   Measurement. No direct payment shall be made for flowable fill when used as backfill in accordance with Items 430 and 480, and the drawings attached thereto.

 

Where used as backfill at other locations, and where measured, flowable fill shall be measured by the cubic yard, computed from the dry weight of the material.

 

434.8                   Where measured for payment in accordance with Section 434.7 of this Item, flowable fill shall be paid for at the contract unit price bid per cubic yard, for flowable fill, which price shall be full payment for all materials, equipment, labor, and transportation necessary to complete the work.

 

There are line code(s), description(s), and unit(s), for this Item. NOTE: This Item required other Standard Specifications

 Item 430 “Construction of Underground Utilities”

 Item 480 “Precast Reinforced Concrete Box Sewers”

END OF ITEM 434

 

ITEM 491

REINFORCED CONCRETE SLOPE PAVING

 

491.1                             Description. This Item shall govern for furnishing and placing reinforced concrete slope paving to the lines, grades, and depths shown on the plans.

 

491.2                             Materials. Concrete shall be Class D concrete, in accordance with the Item 421 "Structural Concrete". Reinforcing steel shall be in accordance with ASTM A615 or A184.

 

With prior approval of the engineer, fly ash may be used with the cement. Cement plus fly ash shall be composed of Portland cement, of the type specified herein and 25 percent fly ash by weight. Fly ash shall be Class  C or Class F, conforming to the requirements of ASTM C618. Fly ash  shall have a minimum CaO content of 20 percent.

 

Curing materials shall be in accordance with the Item 526 "Membrane Curing".

 

491.3                             Construction Methods. Prior to placing material, the subgrade shall be prepared to the proper section for the width and depth of slope paving as shown on the Plans. Construction joints shall be located as shown on the plans, or as otherwise indicated.

 

Place as a minimum requirement: 3/4 inch expansion joint material at the location where slope paving is to be placed against walls, or around columns or piling, and at maximum intervals of 80 feet throughout the length of slope paving. Nail a 3/4 inch by 1 inch deep redwood board to the top of the joint material and after the slope paving has set and cured, remove the redwood board and fill the area with joint sealant.

 

Unless otherwise indicated on the plans, use a minimum No. 4 reinforcing bar conforming to ASTM A615, Grade 60, at a maximum spacing of 12 inches in each direction. The distance from the first parallel bar to the edge of the concrete shall not exceed 3 inches.

 

When welded wire fabric reinforcing is substituted, it shall be equivalent to the No. 4 rebar at 12 inch on centers, at a minimum. The welded wire  shall conform to ASTM A1064. Only flat sheets shall be used. Use a minimum of 6 inch lap at all splices, with not less than 1 inch, nor more than 3 inches clearance from fabric to the edge of concrete, and no wires projecting to last member parallel to the edge of concrete.

 

The reinforcing steel shall be supported throughout the placing of the slope paving to maintain its position approximately equidistant from top and bottom surface of the concrete.

 

The minimum thickness of the reinforced concrete slope paving shall be 5 inches.

 

After the concrete has been placed, compacted and shaped to conform to the dimensions shown on the plans, and after it has cured sufficiently to avoid slumping, the concrete shall be finished with a wooden float to secure a reasonably smooth finish.

 

The concrete shall be cured in accordance with the Item 526 "Membrane Curing".

 

Weep holes shall be installed in the bottoms and walls of the low flow section and in the slope paving at the locations and spacing and in accordance with the details shown on the plans.

 

491.4                             Measurement. Concrete slope protection shall be measured by the  square yard of surface area, complete in place. All edge beams and/or  toe walls, as well as weep holes, shall be incidental to the reinforced concrete slope paving.

 

491.5                             Payment. Concrete slope protection shall be paid for at the contract unit price, measured as provided above. Price shall be full compensation for furnishing and placing all materials, including expansion joint material, joint sealant and reinforcing steel, surface finishing, and curing.

 

There are line code(s), description(s), and unit(s) for this Item. NOTE: This Item requires other Standard Specifications

Item 421 “Structural Concrete” Item 526 “Membrane Curing”

END OF ITEM 491

 

 

ITEM 493 RIPRAP

 

493.1                 Description. This Item shall govern for furnishing and installing of concrete or stone riprap for common erosion protection applications in open channels.

 

493.2                 Materials. The storage area shall be kept clean, firm, and smooth and well drained in order that the riprap can be recovered free from dirt and other foreign matter.

 

The riprap shall be stockpiled and handled so as not to cause undue segregation of particle sizes either in the stockpile, or while loading,  hauling and handling.

 

The riprap shall consist of broken concrete or stone blocks and shall be dense, durable and hard material free from cracks, seams and other defects which would tend to increase deterioration from handling and natural causes.

 

Where broken concrete is used, all exposed metal, including rebar and wire mesh, shall be cut off flush with the surface of the block prior to placing.

 

Spalls, fragments and chips shall not exceed 5 percent by weight. The dimension and shape limitations do not apply to this portion of the riprap.

 

Riprap blocks shall be provided in cubic form, rather than elongated (flat) shapes.

The minimum thickness of each block shall be 6 inches.

 

No more than 25 percent of the blocks may have a length greater than 2- 1/2 times the width or thickness. No length of block shall exceed 3 times the width or thickness.

 

The riprap shall be well graded and shall conform to the following tables unless specifically noted otherwise on the drawings:

 

 

TABLE 1 - RIPRAP GRADATION NO. 1

 

 

Percent Lighter by Weight

 

Stone Weight (Lbs.)

 

Volume Cubic Foot (2)

 

Cubical Shape (Ea. Side, ft.)

 

Spherical Shape (Dia., ft.)

 

 

Lower Limit

Upper Limit

Lower Limit

Upper Limit

Lower Limit

Upper Limit

Lower Limit

Upper Limit

100

180

265

1.20

1.77

1.06

1.21

1.31

1.50

50

80

110

0.53

0.73

0.81

0.90

1.01

1.12

15

40

60

0.27

0.40

0.64

0.74

0.80

0.91

 

NOTES:            The theoretical cube and sphere size is presented in the table for guidance only. The previous size and shape specifications shall govern.

Volume is based on 150 pcf, unit weight.

 

This gradation is to be used in normal applications, and may be noted on the drawings as standard riprap, riprap, 18” thick riprap mats, or other similar designations.

 

TABLE 2 - RIPRAP GRADATION NO. 2

 

 

Percent Lighter by Weight

 

Stone Weight (Lbs.)

 

Volume Cubic Foot (2)

 

Cubical Shape (Ea. Side, ft.)

 

Spherical Shape (Dia., ft.)

 

 

Lower Limit

Upper Limit

Lower Limit

Upper Limit

Lower Limit

Upper Limit

Lower Limit

Upper Limit

100

260

640

1.73

4.27

1.20

1.62

1.49

2.01

50

130

200

0.87

1.33

0.95

1.10

1.18

1.37

15

40

150

0.27

1.00

0.64

1.00

0.80

1.24

 

NOTES:            Provide a 24" thick mat, minimum, for Riprap Gradation No. 2.

 

The theoretical cube and sphere size is presented in the table for guidance only. The previous size and shape specifications shall govern.

Volume is based on 150 pcf, unit weight.

 

The gradation is to be used only where specifically noted on the drawings as “Riprap Gradation No. 2”.

 

For    special    applications,    gradation,    thickness,    and    other    special requirements shall be as shown in the plans.

 

493.3                   Construction Methods. The riprap shall meet the gradation and quality requirements prior to placing.

 

The riprap shall be placed to the slopes, lines, and grades as shown on the drawings, to provide a well-graded mass of riprap without voids.

 

Thickness of the riprap mat shall be as shown on the drawings, with a minimum mat thickness as shown on the gradation tables.

 

The riprap shall be placed in one course (lift) across the channel bottom, then up the channel side slopes. Place the riprap carefully in such a manner to avoid displacement or damage to the prepared surface or geotextile and in such a manner to avoid segregation of particle sizes. Place riprap as close to final position as feasible.

 

The riprap blocks are to be in close contact, well-graded, and free from pockets of small stones or clusters of large stones. Elongated riprap blocks shall be well distributed throughout the riprap mat. Individual oversized blocks will not be permitted. These shall be broken to acceptable size or removed and replaced with riprap within the gradation limits. Surface irregularities shall be minimal.

 

Do not drop riprap from such a height to cause breakage or to damage  the geotextile (if used).

 

Prevent mixture or incorporation of dirt or other materials with the riprap during placing operation.

 

Placing of riprap by any method, machine or hand, will be permitted as long as specified requirements are obtained.

 

Fill spaces between larger riprap blocks with spalls and smaller blocks of the largest feasible size to form a compact mass. Do not place spalls and small blocks in place of larger size blocks.

 

493.4                   Measurement. Riprap shall be measured by the square yard or by the ton of riprap material, as noted on the bid sheets. Riprap Gradation No. 1 when measured by the square yard shall be for a minimum specified thickness of 18 inches, complete in place. Riprap Gradation No. 2 when measured by the square yard shall be for a minimum specified thickness of 24 inches, complete in place.

 

Channel excavation to the top of riprap (finish grade) is measured as shown on the bid sheets.

 

Excavation for the placement of Riprap Gradation No. 1 to 18 inches beyond the finish grade shall be considered incidental to placement of riprap.

 

Excavation for the placement of Riprap Gradation No. 2 to 24 inches beyond the finish grade shall be considered incidental to placement of riprap.

 

Channel fill to the top of riprap (finish grade) is measured as shown on the Bid Sheets. Channel fill, not approved by the Engineer, shall not be measured.

 

Geotextile under the riprap, where required (as shown on the drawings), shall not be measured and shall be considered incidental to riprap.

 

493.5                   Payment. Payment for riprap shall be based on the unit price per square yard or the price per ton for riprap placed, as shown on the plans. Payment shall be full compensation for providing all labor, materials, geotextile, excavation and equipment necessary to complete the riprap installation.

Excavation for the placement of riprap is considered incidental.

 

Payment for Channel Excavation to the top of riprap (finish grade) is paid for as shown on the Bid Sheets.

 

Fill, as approved by the Engineer, to the top of riprap (finish grade) is paid for as shown on the Bid Sheets.

 

There are line code(s), description(s) and unit(s) for this Item. NOTE: This Item requires other Standard Specification

Item 494 “Geotextiles”

END OF ITEM 493

 

 

MAINTENANCE AND CLEANUP OF THE PROJECT SITE

 

560.1                             Description. This Item shall govern  for the maintenance and cleanup of the jobsite both during the term of the construction and at the end of construction.

 

560.2                             General Requirements. The Contractor is required to remove from the job site and dispose of all trash, excess materials, etc., accumulated as a result of and during this work in compliance with current local, State and Federal Regulations.

 

At such time (daily or weekly) as directed by the Engineer, the Contractor shall remove any debris, trash or excess material off the site. He shall make every effort to keep the site in a neat, presentable condition, at all times.

 

In addition, at the end of each month, the entire construction site shall be generally cleaned and all trash and material over the length of the site shall be removed off site to the complete satisfaction of the Engineer.

 

The Contractor will mow, trim and edge the right-of-way and medians on the project for the entire project duration. The mowing schedule shall be as follows:

 

April – October:                     Once per month November – March:             Once every six weeks

 

After the construction work has been completed, the Contractor shall remove all debris, trash, excess materials, forms, stakes, empty sacks  etc. from the site and leave the site with a neat appearance. All  excavation shall be backfilled and all excess excavated material shall be disposed of off the site of the work.

 

560.3                             Measurement and Payment. There shall be no separate payment for this Item.

 

There are no line code(s), description(s), or unit(s) for this Item.

END OF ITEM 560

 

 

TRAFFIC CONTROL

 

671.1                             Description. This shall govern for furnishing, installing, moving, replacing, maintaining, cleaning and removing upon completion of work, all barricades, signs, barriers, barrels, cones, lights, delineators, pavement markings, and other such devices and detours in conformance with the drawings or as directed by the Engineer.

 

A Traffic Control Plan (TCP) has been established for this project in accordance with the Texas Manual on Uniform Traffic Control Devices (TMUTCD). The Contractor may propose an alternate TCP, and if the alternate plan is approved by the Engineer, it may be used. The alternate TCP must be prepared in accordance with Harris County Traffic Control Guidelines (Latest Edition) and sealed by a Professional Engineer registered in the State of Texas proficient in the field of Traffic Engineering.

 

671.2                             Construction Methods. All barricades, signs and other types of traffic control devices shall conform to details shown on the drawings, and those indicated in Part VI of the TMUTCD.

 

Prior to beginning work, the Contractor shall designate in writing a competent person who will be responsible and available on the project  site or in the immediate area to insure compliance with the TCP.

 

The Contractor is solely responsible for furnishing, erecting and maintaining all barricades, signs, barriers, barrels, cones, lights, delineators, pavement markings, and other such devices as necessary to adequately protect the project and workers and warn, advise and safeguard the traveling public over the entire length of the project. The Contractor’s responsibility in this regard extends for the entire duration of the project, from the start of construction until acceptance by the County.

 

All reflective traffic control devices such as barricades, vertical panels, signs, etc. shall be maintained at all times by cleaning, replacing or a combination thereof such that during darkness and rain the reflective characteristics shall equal or exceed the retroreflective characteristics of the standard reflective panels in the Engineer’s possession. Unless otherwise set forth in these Standard Specifications, the Contractor shall receive compensation for furnishing, erecting and maintaining the necessary barricades, signs, barriers, barrels, cones, lights, delineators, pavement markings, other such devices and any incidentals necessary for the good and proper safety, convenience and direction of traffic prior to final inspection and acceptance by the County.

 

Detours and temporary structures necessary for public travel during the prosecution of the work will be indicated on the TCP and the cost included in the bid and contract price. Any necessary detours or temporary

 

structures not indicated on the drawings or provided for in the specifications shall be at the expense of the Contractor. Increased maintenance costs incurred incidental to resulting traffic over an established road, street, or highway as a result of any detour shall not be considered as a cost of maintaining detours and will be paid for by the Contractor.

 

The Contractor shall provide at his expense, means of ingress and egress for all residents and businesses along any closed section of the work and shall provide property owners a means of access to a public road.

 

Temporary access driveways shall provide an all weather surface and shall be maintained by the Contractor in a condition acceptable to the Engineer. Where indicated in the bid documents, asphalt millings may be used for temporary driveways.

 

No section of the work shall be closed to traffic until so directed by the Engineer. No bridge, culvert or drainage structure shall be closed until an adequate detour has been arranged and constructed.

 

If, in the opinion of the Engineer, the Contractor does not comply with the above requirements such work as the Engineer may deem necessary for the safety, comfort and convenience of the traveling public may be performed and the charges therefore withheld from any money due or to become due to the Contractor. The Contractor shall not be  paid  to provide traffic control during delays caused by the Contractor.

 

The above does not preclude the requirements of the “Harris County General Conditions”.

 

Providing, installing, moving, replacing, maintaining, cleaning and removing upon completion of work all barricades, signs, barriers, barrels, cones, lights, delineators, pavement markings, and other such devices shall be in accordance with Item 665 “Work Zone Pavement Markings”, Item 670 “Barricades”, Item 696 “Low Profile Concrete Barrier” and Item 698 “Temporary Polyethylene Water-Filled Barrier”. Flagmen shall be furnished, maintained and possess the minimum qualification and requirements stipulated in the TMUTCD. Operation of flagmen shall be as outlined in Item 672 “Flagmen”.

Temporary pavement markings shall be in accordance with Item 665 “Work Zone Pavement Markings”.

 

Temporary signs and supports shall be made from wood, metal, or other approved materials. Wood for signs shall be minimum 1/2 inch, medium density, outdoor grade plywood. Metal signs shall be in conformance with Item 624 “Aluminum Signs”. Reflectorized sign sheeting shall be in conformance with Item 649 “Wide Angle Prismatic Retroreflective Sheeting for Traffic Control Signs (Diamond Grade). Signs may be  erected on portable, temporary, or fixed supports for use in the work zone. Signs erected on portable supports shall be for daytime use only. All  wood supports shall be painted white. Sandbags shall be used where

 

portable or temporary sign supports require the use of weights to prevent a sign assembly from falling over. All signs shall be placed in accordance with the drawings and the TMUTCD.

 

671.3                            Measurement & Payment. Barricades, signs, barriers, barrels, cones, lights, delineators, and other such devices shall be paid for by the month or per each Jobsite, provided the traffic control plan is properly installed and maintained. This includes preparation of an alternative Traffic Control Plan by the Contractor, if any, and approved by the Engineer.

 

Detours shall be paid for in accordance with Item 673 “Constructing Detours for Maintaining Two-Way Traffic”.

 

Work Zone Pavement Markings shall be paid for in accordance with Item 665 “Work Zone Pavement Markings”.

 

Barriers designated as “Low Profile Concrete Barrier” and “Temporary Polyethylene Water-Filled Barrier” shall be paid for in accordance with Items 696 and 698 respectively.

 

Temporary driveways and the removal of temporary driveways shall be measured and paid for as follows: “Temporary Commercial Driveways per Each” and “Temporary Residential Driveways per Each”. Payment shall include all labor and materials, including shaping, furnishing and hauling necessary to complete the work.

 

There are line code(s), description(s) and unit(s) for this Item: NOTE: This Item requires other Standard Specifications.

Item 624 “Aluminum Signs”

Item 649 “Wide Angle Prismatic Retroreflective Sheeting for Traffic Control Signs (Diamond Grade)”

Item 665 “Work Zone Pavement Markings” Item 670 “Barricades”

Item 672 “Flagmen”

Item 673 “Constructing Detours for Maintaining Two-Way Traffic” Item 696 “Low Profile Concrete Barrier”

Item 698 “Temporary Polyethylene Water-Filled Barrier”

END OF ITEM 671

 

 

ITEM 724

STABILIZED CONSTRUCTION ACCESS

 

724.1                   Description. This Item shall govern for furnishing and installing temporary erosion protection and sediment control stabilized construction access, utilized during construction operations and prior to final stabilization, in accordance with these Standard Specifications and  construction drawings, and as directed by the Engineer.

 

724.2                     Materials. Geotextile fabric shall consist of a woven monofilament or spunbond nonwoven fibers consisting of long-chain synthetic polymers composed of at least 95 percent by weight of  polyolefins.  Geotextile fabric shall equal or exceed the following average roll values or as  directed by the Engineer:

 

  1. Minimum average roll value.

(1)   Elongation ³50%.

(2)   Grab Strength – 200 pounds.

(3)   Puncture Strength – 75 pounds.

(4)   UV Stability (retained strength) – 50% after 500 hours of exposure.

  1. Maximum average roll value.

(1)   Apparent Opening Size (AOS) – 0.6 mm/#30 US sieve.

 

Geotextile fabric shall be resistant to commonly encountered soil chemicals, mildew, rot, insects, and deterioration resulting from exposure to sunlight or heat.  Geotextile fabric shall provide an expected useable  life comparable to the anticipated construction period.

 

Aggregate for the construction access shall consist of crushed stone, gravel, or furnace slag, or combination thereof. The aggregate shall be open graded with a size of 2 inches to 5 inches with no material diameter less than 2 inches and no material diameter greater than 5 inches. Aggregate particles shall be composed of clean, hard, durable materials free from adherent coatings, salt, alkali, dirt, clay, loam, shale, soft or flaky materials or organic and injurious matter. Prior to installation, all exposed metal, including reinforcing steel and wire mesh, shall be cut off flush with the surface of the crushed concrete. The depth of the aggregate shall not be less than 8 inches.

 

Aggregate shall be cubic or rounded form, not elongated, flat, shapes. Spalls, fragments, and chips shall not exceed 5 percent by weight.

 

724.3                   Construction Methods. No clearing and grubbing or rough cutting, other than as specifically directed by the Engineer to allow for soil testing, surveying and installation of erosion protection and sediment control measures, shall be permitted until sediment control and erosion protection systems are in place.

 

 

Stabilized construction access shall be installed at the locations shown on the construction drawings and in accordance with the Standard Civil Drawing or as directed by the Engineer. Stabilized construction access shall be constructed in accordance with an approved schedule that clearly describes the timing during the construction process that the various erosion control measures will be implemented. Stabilized construction access shall be installed so as to prevent tracking or flowing of sediment from the construction site.

 

The construction access location shall be graded to provide sufficient drainage away from the proposed stabilized area. The separation geotextile fabric shall be placed to the width and length of the construction access. Aggregate shall be placed on the underlying  separation  geotextile fabric to the width and length of the fabric and to the specified depth, with the depth being no less than 8 inches. The separation geotextile fabric may be omitted only as approved by the Engineer.

 

When necessary, equipment, truck, and vehicle wheels shall be cleaned to remove sediment prior to entrance onto public right-of-way. When washing is required, the construction access shall be graded to drain into a sediment trap or sediment basin. The sediment trap or sediment basin for the washing area shall be the size and location shown on the construction drawings or as directed by the Engineer.

 

Details for stabilized construction access are shown on the drawing that is incorporated into the Standard Civil Drawings. Stabilized construction access shall be at least 14 feet wide for one way traffic and 20 feet for two way traffic and shall be sufficient for all ingress and egress unless as approved by the Engineer due to site conditions. Length of the stabilized area shall be as shown on the construction drawings, but not less than 50 feet, unless approved by the Engineer due to site conditions.

 

The Contractor shall provide stabilized construction access for project related access roads, parking areas, and other on-site vehicle transportation routes. Stabilization of these areas shall have the same aggregate and thickness requirements as the stabilized construction access unless shown otherwise on the construction drawings.

 

Gravel bags, boards, reinforced filter fabric fence, or similar methods shall be used in combination with the stabilized construction access to prevent sediment from entering public right-of-way, storm sewer system, jurisdictional wetlands, and waterways.

 

The Contractor shall provide periodic top dressing, with additional aggregate, to maintain the required access roadway depth. The Contractor shall be responsible for repairing and cleaning out damaged areas used to trap sediment. All sediment and aggregate tracked or washed into public right-of-way, storm sewer system, jurisdictional wetlands or waterways shall be removed immediately.

 

 

The Contractor shall inspect the stabilized construction access at least once every week or as directed by the Engineer. Damage caused to stabilized construction access shall be repaired immediately. Stabilized construction access shall be maintained by the Contractor until construction staging requires removal or upon final stabilization of the construction site. Upon removal of the stabilized construction access, the area shall be graded as per the construction drawings and stabilized with vegetation, or other. (Note: Maintenance for Item 741 is paid for under

 Item 751 “SWPPP Inspection and Maintenance”)

 

 

If an equipment or vehicle washing area is necessary, The Contractor is responsible for removal and proper disposal of sediment and debris from the sediment trap or basin. Sediment and debris shall not be allowed to flush into the storm sewer system, waterways, jurisdictional wetlands, or onto adjacent properties.  Sediment deposits shall be removed before  they reach 1/3 of the depth of the sediment trap or basin.

 

Uncontaminated sediment can be placed at the project spoil site or, if properly handled, spread out to supplement fill requirements. The Engineer will designate how the sediment deposits are to be handled. Uncontaminated sediment shall not be placed in waterways or jurisdictional wetlands, unless as approved by the Engineer. If sediment has been contaminated, then it shall be disposed of in compliance with current local, State and Federal Regulations. Offsite disposal shall be the responsibility of the Contractor.

 

After final stabilization and at the direction of the Engineer, the Contractor, when required, shall be responsible for removing all erosion protection and sediment control systems that are not permanent, from the project.

 

724.4                   Quality Assurance. The Contractor is responsible for the control of the quality of materials incorporated into the construction and quality of completed construction. The County will engage materials engineering services to provide quality assurance testing and inspection to assist the Engineer in determining the acceptability of materials and completed construction. Quality assurance services provided by the County do not relieve the Contractor of his responsibility for quality control. The  Materials Engineer shall not have control of the means, methods, techni- ques, sequences or procedures of construction selected by the  Contractor.

 

724.5                   Measurement. When paid for directly as a pay item, measurement for stabilized construction access shall be by the square yard, complete and in place.

 

724.6                   Payment. Payment for stabilized construction access shall include and be full compensation for all labor, equipment, materials, supervision and for all incidental expenses for the construction of these items, complete in place, where 60 percent of the total unit cost shall be for the furnishing and installing materials including excavation. Thus, 40 percent of the total

 

 

unit cost shall be for the removal of erosion protection and sediment control systems: stabilized construction access, after final stabilization, at the end of the project.  Construction and maintenance of sediment traps  or basins associated with the stabilized construction access for the purpose of washing equipment or vehicles prior to egress to public right- of-way shall be considered incidental to stabilized construction access.

 

There are line code(s), description(s), and unit(s) for this Item.

 

NOTE: This Item requires a Standard Civil Drawing that shall be incorporated into the contract documents.

 

NOTE: This Item requires other Standard Specifications.

 Item 751 “SWPPP Inspection and Maintenance” END OF ITEM 724

 

 

ITEM 725

GENERAL SOURCE CONTROLS (SWPPP)

 

725.1                   Description. This Item shall govern for erosion protection and sediment control related practices which shall be utilized during construction operations.

725.2                   Materials. Topsoil shall conform to Item 160 “Topsoil”.

 

The Contractor is required to inform the Engineer of the location of the pit or pits from which the  material is to be taken.  Harris County shall have the right to have an independent testing laboratory test the material to determine if it meets these Standard Specifications.

 

725.3                   Construction Methods. No clearing and grubbing or rough cutting, other than as specifically directed by the Engineer to allow for soil testing and surveying, shall be permitted until sediment control and erosion protection systems are in place.

 

The Contractor shall prohibit equipment and vehicles from maneuvering on areas outside of dedicated rights of way and easements for construction. Damages caused by construction traffic to erosion and sedimentation control systems shall be repaired immediately.

Topsoil for Erosion and Sedimentation Control Systems:

When topsoil is called for as a component of another item, Contractor shall conduct erosion control practices during topsoil operation. When applying topsoil, Contractor shall maintain erosion and sediment control systems, such as swales, berms, dikes, and sediment basins. Contractor shall place the topsoil to the lines and grades and to the depths shown on the construction plans.

 

After the areas to receive topsoil have been brought to grade and immediately prior to dumping and spreading the topsoil, the subgrade shall be loosened by discing or by scarifying to a depth of at least 2 inches, to permit bonding of the topsoil to the subsoil. Contractor shall compact by passing a bulldozer up and down the slope, tracking over the entire surface area of the slope to create horizontal erosion control slots. When grading, filling, and applying topsoil around trees, Contractor shall maintain the existing grade within the drip line of trees, unless otherwise indicated.

 

Topsoil shall be material free of clay, rock or gravel larger than 2 inches in any dimension, debris, waste, vegetation and other deleterious matter. Drainage fill shall be selected stone or gravel, graded to pass a 3 inch sieve and retained on a 1 inch sieve.

 

 

No sod, seed, or other vegetation shall be placed on soil that has been treated with soil sterilants until sufficient time has elapsed to permit dissipation of toxic materials.

Protection of Trees in Construction Area:

Contractor shall employ protective measures to avoid damage to existing trees to be retained on the project site. Heavy equipment,  vehicular  traffic, and stockpiles of construction materials, including topsoil, are not permitted within 3 feet of the dripline of any tree to be  retained.  Specimen trees shown on the construction plans shall be boxed or fenced for protection. Contractor shall water those trees indicated to be preserved, as required, to maintain their healthy growth during the course of construction operations.  Contractor shall protect tree root systems  from damage due to noxious materials in solution caused by runoff or spillage during mixing and placement of construction materials  or drainage from stored materials.

 

When called for in the construction plans, tunneling under the root system for the installation of utility lines shall be accomplished by hand digging. Contractor shall not allow exposed roots to dry before permanent backfill is placed. Tree trunks, exposed roots, and limbs of the trees designed to be retained which are damaged during construction operations will be cared for as prescribed by an arborist certified by the International Society of Arboriculture (ISA), at the expense of the Contractor. The Contractor shall extend the pruning operation to restore the natural shape of the entire tree. Main lateral roots, taproots, or old main branches shall not be cut or pruned. The Contractor shall cut branches and roots with sharp pruning instruments.  He shall not break or chop branches and roots.  Cuts over 1/2 inch in size shall be painted with tree pruning compound. Tree pruning compound shall be waterproof, antiseptic, elastic, and free  of kerosene, coal tar, creosote and other substances harmful to trees.

 

Dust Control:

Control dust blowing and moving on construction sites and roads for erosion and sediment control, to prevent exposure of soil surfaces, to reduce on and off site property damage, to prevent health hazards, and to prevent hazardous sight conditions. Control dust blowing by utilizing one or more of the following methods:

 

  1. Mulches bound with natural or chemical binders such as Soiltac®, Terratack®, or equal, as approved by the Engineer.
  2. Temporary or permanent vegetative cover.
  3. Spray-on adhesive, such as Soil Master®, PennzSuppress®, Soil Sement®, or equal, on mineral soils when not used by traffic and as approved by the Engineer.
  4. Tillage to roughen surface and bring clods to the surface.
  5. Irrigation by water sprinkling.
  6. Barriers using solid board fences, snow fences, burlap fences, crate walls, bales of hay, or similar materials.

 

 

Dust control methods shall be implemented immediately whenever dust can be observed blowing on the project site.

Equipment Maintenance and Repair:

Maintenance and repair of construction machinery and equipment shall be confined to areas specifically designated for that purpose. Designated areas shall be located, designed, and maintained so as oils, gasoline, grease, solvents, and other potential pollutants cannot be washed into the storm sewer system or any other receiving stream. Contractor shall not allow oils, gasoline, waste fluids, and other potential pollutants to spill onto the soil or seep into the ground and groundwater. Adequate waste disposal receptacles shall be provided for liquid waste, as well as solid waste. Proper spill response measures and materials will be the responsibility of the Contractor. Designated maintenance areas shall be inspected and properly maintained daily. (Note: Maintenance for Item 725

 is paid for under Item 751 “SWPPP Inspection and Maintenance”)

 

On a site where designated equipment maintenance and repair areas are not feasible, care shall be taken during each individual repair or maintenance operation to prevent spills of potential pollutants. All applicable local, State and Federal Regulations shall be followed for the proper handling, storage, and waste disposal of oils, gasoline, grease, solvents, and other designated potential pollutants associated with the maintenance and repair of construction machinery and equipment.

 

Waste Collection and Disposal:

A plan shall be implemented for the collection and disposal of on site general trash, as well as construction debris. Disposal of waste materials shall be in compliance with current local, State and Federal Regulations. Trash and debris shall not be allowed to overflow its receptacle or accumulate for excessively long periods of time. Receptacles shall be located where they will least likely be affected by storm water runoff.  Trash and construction debris shall not be burned on the project right-of- way.

 

Special provisions shall be made for the collection and disposal of liquid, toxic, or hazardous materials.

Sanitary Facilities:

Adequate sanitary facilities shall be provided for workers. Sanitary collection and disposal shall be in compliance with current local, State and Federal Regulations.

Vehicle Washing:

Construction equipment and vehicles, such as concrete trucks, shall be washed in designated areas only, as approved by the Engineer. These designated wash areas shall be designed and maintained such as to prevent runoff from leaving the site, as well as preventing the runoff from entering a storm sewer system or into a watercourse. The designated areas shall be located where the wash water will evaporate or infiltrate directly into the ground and where runoff can be collected in a temporary

 

 

holding or seepage basin. Wash areas shall not be located immediately adjacent to a storm sewer system or other watercourse or near a designated jurisdictional wetland. Concrete waste shall be permitted to  dry in a controlled pit, sump, or other, and the waste shall be removed from the project site.

Storage of Construction Materials and Chemicals:

Storage of chemicals, cements, solvents, paints, pesticides, herbicides, fuels, or other potential pollutants shall be stored so that they will not be in contact with storm water runoff or cause potential leachate to the soil or groundwater. These items shall not be stored adjacent to a storm sewer system or other watercourse. Storage and use shall be in  compliance  with current local, State and Federal Regulations, as well as manufacturer's guidelines.

 

Contractor shall have a spill response program which addresses spills of construction related hazardous and toxic materials.

Demolition Areas:

Demolition projects usually generate large amounts of dust with significant concentrations of heavy metals and other toxic pollutants. Dust control techniques shall be used to limit the transport of the airborne pollutants. Water or slurries used to control dust shall not be allowed to flow into the storm sewer system or other watercourse.

Street Cleaning:

Street cleaning, such as sweeping, vacuuming, or shoveling, shall be provided along project area roadways where erosion have deposited or construction traffic have tracked sediments, mud, or debris. Contractor shall inspect the roadways daily, and perform the cleaning on a daily basis, if necessary. Washing or flushing of sediments, mud, or debris into adjacent drainage systems is prohibited.

 

Dewatering:

The pumping of ponded storm water, or other waters, from the project site directly into an adjacent watercourse or storm sewer system shall not be permitted unless the water has been pretreated through a sediment basin or other method, and as approved by the Engineer.

 

Pesticides, Herbicides, and Fertilizers:

Contractor shall only use pesticides, herbicides, and fertilizers on the construction site as indicated in the construction specifications and plans or as approved the Engineer. Pesticides, herbicides, and fertilizers shall be stored, used, applied, and disposed of in accordance with manufacturer’s guidelines and with local, state, and federal regulations. Contractor shall not dispose of the pesticide, herbicide, and fertilizer wastes, and containers, on site or in the storm sewer system or other watercourse.

 

 

725.4                   Measurement and Payment. No separate payment shall be made for this Item. The work performed under this Item shall be paid for  and considered incidental to Item 751 “SWPPP Inspection and Maintenance”.

 

There are no line codes for this Item.

NOTE: This Item requires other Standard Specifications. Item 160 “Topsoil”

Item 751 “SWPPP Inspection and Maintenance”

END OF ITEM 725

 

 

ITEM 730

CONCRETE TRUCK WASHOUT STRUCTURES

 

730.1                   Description. This Item shall govern for furnishing, installing and removing concrete washout structures. The description for maintenance is included in this Item, but payment for maintenance is part of Item 751 “SWPPP Inspection and Maintenance”.

730.2                   Submittals. Concrete truck washout structure shall be used per Standard Civil Drawing.

 

Submit site plan showing location(s) of concrete truck washout structure(s) for approval.

 

Submit plan for disposal of both concrete truck washout water and solid concrete wastes for approval.

 

730.3                   Concrete Truck Washout Structure. Refer to the Standard Civil Drawing detail for “Concrete Truck Washout Structure”, with sandbags.

730.4                   Placement. Do not locate concrete washout structures within 50 feet of storm drain inlets, open drainage facilities or watercourses.

 

Locate away from construction traffic or access areas to prevent disturbance or tracking.

730.5                   Construction. Install a sign adjacent to each temporary concrete washout structure to inform concrete equipment operators to utilize the proper facilities. See Detail sheets for sign dimensions.

Detail – “Below Grade Concrete Truck Washout Structure with Sandbags”.

  • Construct temporary concrete truck washout structures below grade with a minimum length and width of 10 feet. Construct and maintain concrete truck washout structures in sufficient quantity and size to contain all liquid and concrete waste generated by washout operations.
  • Remove rocks and other debris in soil base of structure that might tear or puncture the plastic lining.
  • Provide plastic lining material which is a minimum of 10 mil thick polyethylene sheeting. Sheeting shall be free of holes, tears or other defects that compromise the impermeability of the lining. Install lining seams in accordance with manufacturers’ recommendations.
  • Provide sandbags to hold plastic lining in place.
  • Install 15 feet by 35 feet by 8 inches thick granular fill truck parking pad underlain with geotextile per Item 724 “Stabilized Construction Access”.
  • Install orange safety fence around three sides of the structure as shown on the drawing detail.

 

 

730.6                   Maintenance. Once concrete wastes are washed into the designated structure and allowed to harden, break up the concrete, remove and dispose in accordance with approved submittal.

 

Inspect lining integrity and level in concrete washout structure before each rainfall to prevent overtopping due to rainfall and daily during periods of daily rainfall and, at a minimum, once every week.

 

Repair or replace damaged lining or other damaged or missing parts of the washout structure immediately.

 

Maintain level in washout structure(s) to provide adequate holding capacity with a minimum freeboard of 12 inches.

 

Existing washout structure(s) must be cleaned, or new washout structure(s) constructed and ready for use once the washout structure is 75 percent full. Contractor is responsible for any concrete washed out in other location. (Note: Maintenance for Item 730 is paid for under Item 751

 “SWPPP Inspection and Maintenance”)

 

730.7                   Removal of Concrete Washout Structures. Once concrete washout structures are no longer required, as determined by the Engineer, remove and dispose the hardened concrete and concrete washout water per the approved submittal.

 

730.8                   Material Disposal. Dispose materials used to construct truck washout structure(s) and granular fill parking pad(s) in compliance with current local, State and Federal Regulations.

 

Remove unusable, objectionable or excess material from the construction work area. Dispose of such material in compliance with current local, State and Federal Regulations.

 

Disposal of material in the 100-year flood plain without permits is prohibited.

 

Disposal of material in wetlands or other environmentally sensitive areas without permits is prohibited.

 

Material disposed of without permits shall be removed and properly disposed of at no cost to the County. Restore the site at no cost to the County.

730.9                   Site Restoration. Compact clean fill in pit up to surrounding grade.

 

Backfill and repair all holes, depressions or other ground disturbances caused by the construction and removal of the concrete washout structure(s).

 

Restore concrete washout structure area to match surrounding grade and vegetation.

 

Page -3-                                                                                    AFTER MARCH 1, 2014

REVISION 2

730.10                Measurement. Measurement is as noted as lump sum. No separate measurement will be made for maintenance or removal of accumulated washout structure wastes.

 

730.11                Payment. Payment is lump sum, for the duration of the project. Payment shall include and be full compensation for all labor, equipment, materials, supervision and for all incidental expenses for theinstallation of concrete washout structures, complete in place, where 60% of the total cost shall be for the furnishing and installation with embankment and excavation. Thus, 40% of the total cost shall be for the removal of concrete truck washout structures, after final stabilization, at the end of the project.

 

No separate payment will be made for maintenance or removal of accumulated washout structure wastes, per this Item. Removal of the concrete washout structure and site restoration is a part of the cost bid for the concrete washout structure. For the Below Grade Concrete Washout Structure shown on the Standard Civil Drawing detail, the sandbags and geotextile are incidental to the cost of the concrete truck washout structure.

 

There are line code(s), description(s), and unit(s) for this Item.

 

NOTE: This Item requires a Standard Civil Drawing that shall be incorporated into the contract documents.

NOTE: This Item requires other Standard Specifications. Item 724 “Stabilized Construction Access”

Item 751 “SWPPP Inspection and Maintenance”.

END OF ITEM 730

 

 

ITEM 750 ROCK FILTER DAMS

 

750.1                   Description. This Item shall govern for furnishing and installing temporary erosion protection and sediment control rock filter dams utilized during construction operations and prior to final stabilization in accordance with these Standard Specifications and construction drawings, and as directed by the Engineer. Rock filter dams are temporary berms constructed of stone to intercept and slow storm water runoff to retain sediment on the construction site. Depending upon the type of rock filter dam specified in the construction plans as Type 1, 2, 3, 4, or 5, the aggregate fill may be unwrapped, wrapped in twisted hexagonal wire mesh, or confined in a gabion wire basket.

 

Applications of RockFilter Dams:

 

  1. Type 1 dams may be used at toe of slopes, around inlets, in small ditches, and at dike or swale outlets. Type 1 dams are recommended for erosion and sediment control from a drainage area of 5 acres or less.
  2. Type 2 dams may be used in ditches and at dike or swale outlets.
  3. Type 3 dams may be used in stream flow.
  4. Type 4 sack gabions may be used in ditches and smaller channels to form an erosion and sediment control dam.
  5. Type 5: As shown in plans.

 

750.2                   Materials. Geotextile fabric shall consist of a woven monofilament or spunbond nonwoven fibers consisting of long chain synthetic polymers composed of at least 95 percent by weight of  polyolefins.  Geotextile fabric shall equal or exceed the following average roll values or as directed by the Engineer:

  1. Minimum average roll value.

(1)     Elongation ³50%.

(2)     Grab Strength – 200 pounds.

(3)     Puncture Strength – 75 pounds.

(4)   UV Stability (retained strength) – 50% after 500 hours of exposure.

  1. Maximum average roll value.

(1)     Apparent Opening Size (AOS) – 0.6 mm/#30 US sieve. Geotextile fabric shall be resistant to commonly encountered soil chemicals, mildew, rot, insects, and deterioration resulting from exposure to  sunlight or heat.                Geotextile fabric shall provide an expected useable life comparable to the anticipated construction period.

 

Aggregate for the rock filter dams shall consist of crushed stone. Aggregate particles shall be composed of clean, hard, durable materials free from adherent coatings, salt, alkali, dirt, clay, loam, shale, soft or flaky materials or organic and injurious matter. Aggregate shall be cubic or

 

 

rounded form, not elongated, flat, shapes. Spalls, fragments, and chips shall not exceed 5 percent by weight. Crushed concrete shall not be substituted for the crushed stone unless as approved by the Engineer.

Aggregate size shall depend upon the type of rock filter dam specified in the construction plans. Aggregate size based on type of rock filter dam is as follows:

  1. Type 1:           3 inches to 5 inches, open graded.
  2. Type 2:           3 inches to 5 inches, open graded.
  3. Type 3:           4 inches to 8 inches, open graded.
  4. Type 4:           3 inches to 5 inches, open graded.
  5. Type 5:           As shown on the plans.

 

Mesh is required for reinforced type rock filter dams. Mesh shall be 20 gauge galvanized double twisted hexagonal wire mesh with 1 inch diameter hexagonal openings. Mesh wire shall be zinc coated prior to being double twisted. Reinforcing spiral binders, lacing wire,  and stiffeners shall be made of wire having the same coating material and same wire size as the wire mesh. Gabion wire baskets shall equal or exceed the requirements of the wire mesh.

 

750.3                   Construction Methods. No clearing and grubbing or rough cutting, other than as specifically directed by the Engineer to allow for soil testing, surveying and installation of erosion protection and sediment control measures, shall be permitted until sediment control and erosion protection systems are in place.

 

Rock filter dams shall be installed at the locations shown on the construction plans and in accordance with the Standard Civil Drawing or as directed by the Engineer. Rock filter dams shall be the types specified in the construction plans. Rock filter dams shall be constructed in accordance with an approved schedule that clearly describes the timing during the construction process that the various erosion control measures will be implemented. Rock filter dams shall be installed so as to prevent downstream deposition of sediment and debris from the construction site.

 

The separation geotextile fabric and wire mesh shall be sized and placed in accordance with the rock filter dam detail and as specified by the type  of rock filter dam shown in the construction plans. The separation geotextile fabric may be omitted only as approved by the Engineer. The separation geotextile fabric and wire mesh shall be securely staked with wooden or metal stakes to the bottom and side slopes of the ditch or channel prior to aggregate placement. Sack gabions for Type 4 rock filter dams shall be securely staked with wooden or metal stakes to the bottom and side slopes of the ditch or channel, as well.

 

Aggregate fill shall be placed to the width, length, height and slopes in accordance with this Item and the rock filter dam detail and as specified  by the type of rock filter dam shown in the construction plans. The height of the dam shall be measured vertically from the existing ground to the top of the filter dam. The length of the dam shall be measured across the top

 

 

centerline of the dam from embankment to embankment and includes the additional length embedded into the embankment. Width of the dam shall be measured along the top face of the dam.

 

Wire mesh shall be folded upstream side over the aggregate fill and tightly secured to itself on the downstream side using wire tires. Rings may be substituted for wire ties.

 

Additional aggregate fill or gravel bags shall be placed and secured at the embedded section to prevent low flows from short circuiting the dam at  the adjacent dirt embankment area. Gravel bags shall meet the specifications of Item 741 “Inlet Protection Barrier (for Stage II Inlets, Gravel Bags)”.

 

The Contractor shall be responsible for periodic reshaping, repairing, and maintaining of rock filter dams as directed by the Engineer.

 

The Contractor shall inspect the rock filter dam at least once every week or as directed by the Engineer. Damage caused to rock filter dams shall be repaired immediately. Rock filter dams shall be maintained by the Contractor until construction staging requires removal or upon final stabilization of the construction site. Upon removal of the rock filter dam, the area shall be stabilized with vegetation, or other. (Note: Maintenance for Item 750 is paid for under Item 751 “SWPPP Inspection and

 Maintenance”)

 

The Contractor is responsible for removal and proper disposal of sediment and debris from the rock filter dam. Removed sediment and debris shall not be allowed to flush into the storm sewer system, waterways, jurisdictional wetlands, or onto adjacent properties. Sediment deposits shall be removed before they reach 1/3 of the height of the dam.

 

Uncontaminated sediment can be placed at the project spoil site or, if properly handled, spread out to supplement fill requirements. The Engineer will designate how the sediment deposits are to be handled. Uncontaminated sediment shall not be placed in waterways or jurisdictional wetlands, unless as approved by the Engineer. If sediment has been contaminated, then it shall be disposed of in compliance with current local, State and Federal Regulations. Offsite disposal shall be the responsibility of the Contractor.

 

After final stabilization and at the direction of the Engineer, the Contractor, when required, shall be responsible for removing all erosion protection and sediment control systems that are not permanent, from the project.

 

Pursuant to Section 404 of the Clean Water Act, a permit may be required for placement of fill, rock filter dams, into Waters of the United States, Waters of the State, and their associated jurisdictional wetlands. The Contractor shall not proceed with the construction of the rock filter dams in Waters of the United States, Waters of the State, and their associated jurisdictional wetlands until the permits are obtained.

 

 

 

750.4                   Quality Assurance. The Contractor is responsible for the control of the quality of materials incorporated into the construction and quality of completed construction. The County will engage materials engineering services to provide quality assurance testing and inspection to assist the Engineer in determining the acceptability of materials and completed construction. Quality assurance services provided by the County do not relieve the Contractor of his responsibility for quality control. The  Materials Engineer shall not have control of the means, methods, techni- ques, sequences or procedures of construction selected by the  Contractor.

 

750.5                   Measurement. When paid for separately as a pay item, measurement for rock filter dams, Types 1,2,3,4, or 5 shall be by the linear foot, as shown on the plans, complete in place. Measurement shall be along the centerline of the top of the dam from embankment to embankment and includes the additional length which is embedded into the embankment.

 

750.6                   Payment. Payment for rock filter dams shall include and be full compensation for all labor, equipment, materials, supervision and for all incidental expenses for the construction of these items, complete in place, where 60 percent of the total unit cost shall be for furnishing and installation with embankment and excavation. Thus, 40 percent of the  total unit cost shall be for the removal of erosion protection and sediment control systems: rock filter dams, after final stabilization, at the end of the project. Geotextile fabric, reinforcement, aggregate fill, and gravel bags shall be considered incidental expenses to this Item. Disposal  of  sediment and debris are considered incidental expenses to this Item.

 

There are line code(s), description(s), and unit(s) for this Item.

 

NOTE: This Item requires drawing details that shall be incorporated into the contract documents.

 

NOTE: This Item requires other Standard Specifications.

 

Item 741 “Inlet Protection Barrier (for Stage II Inlets, Gravel Bags)” Item 751 “SWPPP Inspection and Maintenance”

END OF ITEM 750

 

 

EXCAVATION FOR CHANNEL AND OTHER DRAINAGE FACILITIES

 

 

Section 120.4 Measurement & Payment. The excavation for channel and other drainage facilities shall have the following paragraph added:

 

Regrading of existing channels shall be measured in its original condition along the centerline and the total length be computed, in Linear Feet and shall be full compensation for furnishing all labor, supervision, supplies, materials, permits and equipment required to complete the work, including all items of excavation, disposal, haul, compaction, grading, and channel dressing as specified, in the project documents

 

 

TRAFFIC CONTROL

 

 

Section 671.3 Measurement & Payment. The first paragraph is replaced with the following:

 

Barricades, signs, barriers, barrels, cones, lights, delineators, and other such devices shall be paid for by the Lump Sum, provided the traffic control plan is properly installed and maintained. This includes preparation of an alternative Traffic Control Plan by the Contractor, if any, and approved by the Engineer.

 

 

GENERAL SOURCE CONTROLS (SWPPP)

 

 

Section 725.4 Measurement & Payment. This item is replaced with the following:

 

No separate payment shall be made for this item. Each proposed control is paid separately.

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