Parks Construction Specification Erie Colorado

Engineering
2017-12-15
Eire, Colorado Parks and Recreation

1080.00           TRAILS, WALKWAYS AND MAINTENANCE PATHS

1081.00           Concrete Trails, Walkways and Maintenance Paths

All sidewalks and maintenance paths within the parks, open space, or greenbelts, which could be utilized by the general public for conveyance, will be a minimum of eight (8) feet wide and six (6) inches thick concrete and shall have fiber mesh included in the mix. The concrete shall have minimum twenty-eight (28) day compression strength of four thousand (4,000) pounds per square inch (PSI) and shall meet all applicable requirements of Section 400.00, Concrete Work, of these STANDARDS AND SPECIFICATIONS.

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1082.00           Soft Trails

Soft trails will conform in accordance with the Standard Drawings unless otherwise approved by the Assistant to the Town Administrator-Community Services or designee.

1083.00            Trail Specifications

1083.01           Location of Trails

To the extent possible, trails should be located, configured and set back from natural creeks or bodies of water so that recreation use will not significantly impact native plant and animal habitat, or be damaged by high water events.

1083.02           Alignment of Trails

Trails should be generally sinuous in nature, avoiding overlong and straight runs greater than 300 feet. A two foot (2’) change from centerline, alternating from side to side every one hundred feet (100’) is the standard used by the Town.

1083.03           Width of Trail Corridor

Spaces used to accommodate trails should be generally no less than three (3) times the width of the trail and shall accommodate development of Americans with Disabilities Act (ADA) compliant trails.

1083.04           Requirement for Flared Ends at Intersecting Trail Connections

At each trail intersection, there shall be a flared end to assist maintenance vehicles, pedestrians and cyclists in navigating the turn. At ninety (90) degree intersections, a three foot (3’) flare shall be placed. For more information, see the Stand Detail sheet which shows this requirement. If not clearly shown on approved construction drawings, trails which intersect at an orientation other than ninety (90) degrees will be field-fitted to create an appropriate flared trail connection.

1083.05           Crusher Fines Specifications

Crusher fines shall be gold or grey colored, depending upon project requirements. 100% of crusher fines are to pass through a ¼” screen; no larger material shall be included within the crusher fines mixture. The mixture should be approximately 25% pebbles (screen sizes >#4 and <#10); 35% grit (screen sizes >10 and <100); and 40% dust (screen sizes >#100 and <#270). Vendor must supply a material sample for approval by the Assistant to the Town Administrator-Community Services or designee, as well as a written composition analysis showing the sieve size and amount of material retained within each sieve.

1083.06           Use of Stabilized vs. Unstabilized Crusher Fines

Normally, unstabilized crusher fines are adequate for most trail applications. However, if pathway (or a portion of the pathway) is to be located within an area that is subject to a 1% or greater probability of flooding in any one year (100 year flood plain or greater), than polymer-stabilized crusher fines are to be used. Suitable polymers include Soiltac, StaLoc, and NaturalPave (or equivalent). Vendor must supply a material sample for approval by the Assistant to the Town Administrator-Community Services or designee, as well as a written composition analysis showing the sieve size and amount of material retained within each sieve, as well as the polymer content. Petroleum-based polymer products are unacceptable and will be rejected.

1084.00           Types of Trails 

1084.01           Spine Trail

Spine Trails consist of a wide concrete trail (8’-10’) with an attached crusher fines trail (4’). In areas with low water conditions that may experience regular flooding, or turf areas that are permanently irrigated, a ten foot (10’) or wider concrete trail may be substituted for the standard spine trail configuration of a concrete trail with an attached crusher fines trail.

A. A.1. Shoulders maximum slope 1:6.

A.2. The cross slope across travel surface shall not exceed 2%.

B. Soft surface width – 4’ crusher fines with geo textile fabric underlayment.

B.1.     Shoulders must be a minimum width of 2’, with up to 6’ preferred.

B.2.  Slope along the direction of travel not to exceed 5%.

  1. All spine trails must meet ADA standards.
  2. Minimum trail corridor width 30 – 40’ or greater preferred.
  3. Trails shall be designed to minimize crossings of streets and other hazards.
  4. On grade street crossings will be clearly marked with signage and cross-walks. Must conform to American Association of State Highway & Transportation Officials (AASHTO) Standards.
  5. Stop signs shall be installed at all street crossings.
  6. Prefer on grade street crossings at intersections rather than mid-block.
  7. Trails shall be located away from nuisance areas such as oil and gas facilities, dangerous ditches, steep slopes and mining areas that include tailings and shafts.
    1. Minimum overhead clearance shall be 10’. Minimum side clearance shall  be 8’ from edge of trail.
    2. Spine trails shall be designed to accommodate maintenance vehicles such as pick up trucks and utility vehicles for routine all weather maintenance.
    3. Locate spine trails in open space areas whenever possible.
    4. Avoid locations which impact native plant and animal habitat.
    5. Where the path is located next to a steep drop off or embankment, an ADA- compliant railing with a minimum height of 36” and/or a 5’ separation between the trail and top or bottom of embankment is required.
  1. Minimum turning radius for 20 mph trails shall be 100 ft, 25 mph trails 156 ft, 30 mph trails 225 ft. In cases where substandard curve radius is unavoidable curve warning signs and centerline striping shall be used.
  2. Stormwater and drainage control shall be installed to prevent standing water, soil accumulation, moss and algae on trail surface.
  3. Adequate sight distance at curves and intersections must be maintained. Must conform to AASHTO Standards.
  4. General design speed of 20 mph should be used for all spine trails.
  5. Follow AASHTO Guide for the Development of Bicycle Facilities.

1084.02           Local Trails

  1. Local trail width equals the width of the spine trail to which it connects.
  2. Local trails are made of concrete, using the specifications shown above in 1084.01.
  3. At no time will the width of a local trail be less that 6’.
  4. Slope across trail not to exceed 2%.
  5. Slopes along direction of travel not to exceed 5%.
  6. Trails should be located away from nuisance areas, including above ground oil and gas facilities, pipelines, dangerous ditches, steep slopes, and mining areas that include tailings and shafts.
  7. All local trails must meet ADA Standards.
  8. Local trails shall be designed to accommodate maintenance vehicles.
  9. Adjacent slopes, grades and separations shall comply with those described under Spine Trails (section 1084.01).
  10. Minimum overhead clearance shall be 10’; minimum side clearance shall be 8’.

1084.03           Primitive Trails

  1. Primitive trails shall be located away from steep slopes, sensitive habitat and natural areas and nuisance areas.
  2. Minimum width shall be no less than 4’.
  3. Primitive trails shall consist of stabilized crusher fines with geo textile fabric underlayment.
  4. Erosion control components shall be installed at appropriate locations.
  5. Adjacent slopes, grades and separations shall comply with those described under Spine Trails (section 1084.01)
  6. Minimum overhead clearance shall be 10’; minimum side clearance shall be 8’.

1084.04           Trailheads

  1. Trailheads shall be provided where primary trail routes converge and where access from street to parking is convenient.
  2. Adequate number of parking spaces is required based upon projected use of trailhead including the required number of parking spaces meeting current ADA guidelines, including hard surfacing, signage, ramps, detectable warnings, etc.
  3. Adequate location and informational signage is required at trailhead, including trail name and map and ordinances. Signage must comply with Town of Erie sign specifications and include town logo.
  4. Trash containers shall be provided, number based upon projected use. Containers must be of an approved design, be anchored, expanded metal, and covered to exclude animals.
  5. Pet Waste stations shall be provided that match to current model in use by Parks & Recreation Department.
  6. Benches and tables shall be provided based on projected use. 6’ expanded metal and surface mounted on concrete pad.
  7. All amenities shall be ADA accessible and selected for durability and vandal resistance, consistency of color, material and form. All amenities shall be approved by the Assistant to the Town Administrator-Community Services or designee.
  8. Portable restrooms in a permanent enclosure may be installed as appropriate using MZI enclosures or approved equivalent.

1084.05           Waysides

  1. Located every ½ mile.
  2. Will include 6’ benches or tables of expanded metal which shall be surface mounted on concrete pad. Tables should be ADA accessible.
  3. Adequate number of seating elements based on projected trail use.

1084.06           Bridges

  1. All bridge designs must be stamped as certified by a licensed Engineer and be approved by the Town Engineer or designee.
  2. Bridges must meet all current ADA accessibility guidelines.
  3. Bridges shall be of steel construction.
  4. Bridges shall have a minimum clear width of 10’.
  5. Bridges must accommodate a minimum load weight of 10,000 pounds for maintenance vehicles. Depending upon location, higher load weights may be required.
  6. Concrete floors are preferred. Wood or TREX-type recycled plastic lumber may be acceptable, but must be approved in writing by the Assistant to the Town Administrator-Community Services or designee.
  7. Bridges must conform to all current standards, including the AASHTO Guide Specifications for Design of Pedestrian Bridges, the AASHTO Standard Specifications for Highway Bridges, and the CDOT Standard Specifications for Road and Bridge Construction
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