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Resolution - 2021 - 21-24 - Adopting Trail And Pathway Design And Construction Standards - 12/14/2021 RESOLUTION NO. 21-24 A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF EAGLE, IDAHO ADOPTING TRAIL AND PATHWAY DESIGN AND CONSTRUCTION STANDARDS, AND PROVIDING AN EFFECTIVE DATE. WHEREAS the Mayor and City Council desire to provide the citizens of Eagle with safe and durable trails and pathways that will support the desired level of service and reflect the City of Eagle Trails and Pathways Master Plan with a minimum of long-term maintenance; and WHEREAS the Mayor and City Council desire to adopt a sustainable trail and pathway construction standard which addresses the conditions,topography,and the forces that impact trails and pathways in the City of Eagle area of impact; and WHEREAS the Mayor and City Council desire to provide consistent standards for the development of trails and pathways within the City of Eagle; and WHEREAS the Mayor and City Council desire to establish adopted standards for inclusion in future grant applications that require that official construction standards be used in the formulation of cost estimates, and for the reconstruction of City-maintained trails and pathways. NOW THEREFORE, BE IT RESOLVED BY THE MAYOR AND CITY COUNCIL OF THE CITY OF EAGLE, Ada County, Idaho, as follows: CITY OF EAGLE TRAIL AND PATHWAY DESIGN AND CONSTRUCTION STANDARDS A. Regional and Community Trail and Pathway Design: while the City may exercise considerable discretion in determining design,the following minimum standards shall be followed unless exceptions are approved in writing: 1. Tread width (the width of the finished trail or pathway surface) shall be determined by the guidelines found in Eagle City Code 9-4-1-6 and are subject to City revision and approval. 2.Layout must facilitate access of maintenance,construction,and emergency vehicles(i.e., Turn radius and slope suitable for full size pickup and 15' trailer). Consideration of vehicle access from public roadways, vehicle turnaround, and materials staging will be evaluated by the City. 3. If bollards, or any other access controls, are required for security, they must be removable and employ a locking method approved by the City. Lock keys or access information will be provided to the City. Page 1 of 9 C:\Users\tnrumsey\Documents\Resolution No.21-24 Trail and Pathway Design and Construction Standards.docx 4. Connections to sidewalks, trails and pathways must be transitioned using a radius of no less than 8-feet. Curb ramps where pathways meet roadways shall be provided where they are permitted by ACHD. 5. Landscaping along City Maintained trails and pathways is prohibited within 4-feet of the tread except for grass seeding, sod,or gravel beds. Areas within 4-feet of the trail tread are subject to damage in the course of maintenance and/or repair by the City and will be repaired or replaced by the property owner. The landscape, fence and building regulations for this area shall be indicated by a note on the plat. 6. Existing trees within 6-feet of the tread shall be removed. (Some exceptions shall be made to preserve streambank stability. See City Code 8-2A-7(C) and 8-2A-7(Q) for removal and replacement requirements.) 7. Planting of trees within 8-feet of the tread is prohibited. 8. To improve sightlines and user safety, at no time in the lifespan of trees or shrubs, will they be permitted to obstruct spaces above grade within 3-feet of the tread horizontally or 8-feet vertically relative to the tread. Planting locations must account for expected growth of species selected. 9. All roots shall be cut along both sides of the tread a minimum of 15-inches in depth and remove all root and organic material that crosses the tread prior to construction. 10. To increase user safety and extend the life of the tread surface, adjacent irrigation systems must not distribute water onto the tread in calm weather conditions. 11. Public trails and pathways that are anticipated to connect to an adjacent trail or pathway are to employ the cul-de-sac design below. The public access easement must extend to the parcel boundary and allow possible connection to adjacent development and allow the City, or City authorized parties, and adjacent developers, to make alterations within the easement. Such alterations to elements include, but are not limited to, connection to other trails and pathways, landscaping, fencing, irrigation equipment and signage. a. Tread surface to be constructed using City approved materials and widths. b. Design to employ an 8-foot radius minimum in transitions from the cul-de-sac circle to the main tread. c. Cul-de-sac turnaround area tread to be 6-feet greater in diameter than the approved tread width. d. Cul-de-sac to terminate between 3-feet and 10-feet from the property boundary. e. Compacted 3/4-inch minus and 6-inch minus layers are to extend 6-inches beyond the outer edge of the tread material. f. For City maintained trails and pathways, a gravel bed must extend between 3- feet and 4-feet from the tread edge in all landscaped environments. (See Section E for landscaped areas, Section F for natural areas.) Page 2 of 9 C:\Users\mrumsey\Documents\Resolution No.21-24 Trail and Pathway Design and Construction Standards.docx . 1 0 0 © B. Neighborhood Trail and Pathway Design: while the City may exercise considerable discretion in determining design, the following minimum standards shall be followed unless exceptions are approved in writing: 1. Tread width (the width of the finished trail or pathway surface) shall be determined by the classifications found in Eagle City Code 9-4-1-6 and are subject to City revision and approval. 2. Connections to sidewalks,trails and pathways must be transitioned using a radius of no less than 8-feet. Curb ramps where pathways meet roadways shall be provided where they are permitted by ACHD. 3. To improve sightlines and user safety, at no time in the lifespan of trees or shrubs, will they be permitted to obstruct spaces above grade within 3-feet of the tread horizontally or 8-feet vertically relative to the tread. Planting locations must account for expected growth of species selected. 4. To increase user safety and extend the life of the tread surface, adjacent irrigation systems must not distribute water onto the tread in calm weather conditions. C. Tread Surface Specifications 1. Concrete:provide a 3.5-inch-deep Portland cement 4000psi with fiber mesh reinforcement (1.5 lbs/cy) additive tread surface, cross-sloped at 1.75% +/- 0.25%, and centered on the gravel base. This surface is to be medium broom finished, with a 0.75-inch tooled radius on edge. Control joints shall be 10-feet o.c., saw cut. Expansion joints shall be at 40-feet o.c., shall provide and install (5) 24-inch length #3 rebar. Expansion joint material shall comply with AASHTO M213 and shall be installed vertically extending to the full depth and width of the concrete work. 2. Asphalt: a 2.5-inch deep 10-foot-wide class iii asphalt tread surface, sloped at 1.75% +/- .25%. This surface is to be compacted in accordance with ISPWC 810.3.12. Page 3 of 9 C:\Users\mmmsey\Documents\Resolution No.21-24 Trail and Pathway Design and Construction Standards.docx 3. Natural Surface: provide a 2.5-inch deep 1/2 minus crusher fines tread surface in accordance with the approved tread width. It is to be sloped at 1.75%+/- .25%. This surface is to be compacted and the finished surface shall be suitable for wheeled,non- motorized traffic. The rock must be crushed into irregular and angular particles to allow interlocking into a tight matrix. Rounded particles like pea gravel or decomposed granite are not permitted. If the gradation of crusher fines does not meet the 10%passing the #200, clay fines may be added and mixed with the aggregate. Consistent mixing of particles is critical. Material shall have a percent wear not more than 35, at 500 revolutions as determined using the Los Angeles abrasion test(AASHTO-T96). Natural surface tread material gradation table: SIEVE SIZE%PASSING PARTICLE SIZE %OF PASSING BY WEIGHT 1/2" 100% 3/8" 100% #4 70-90% #8 45-70% #16 28-50% #30 19-34% #50 12-25% #100 7-18% #200 10- 15% D. Trail and Pathway Construction Specification: 1. All classifications of trails shall be built to the same standards with the exception of surface materials and width,unless approved by the City. a. To be constructed on undisturbed native soil or compacted fill. b. Install 8-inches of 6-inch minus pit run. It must be compacted to 95%on top of undisturbed soil. c. Apply monobar-chlorate and Trifluralin to base per manufacturers specifications. Below an installed weed fabric (4 oz. Non-woven geotextile filter fabric) under the entire 4-inch layer of 3/4-inch minus. d. Install 4-inches of 3/4-inch minus crushed gravel base compacted to 95%. e. Construct the approved tread surface as specified in Section C to the City approved width. f. Tread width to be determined by City Council approval and may vary from the City Code 9-4-1-6 Trail and Pathway Classifications based on area factors and conditions. Page 4 of 9 C:\Users\mrumsey\Documents\Resolution No.21-24 Trail and Pathway Design and Construction Standards.docx g. 3/4-inch minus and 6-inch minus layers are to extend 6-inches beyond both outer edges of the tread material (intended to improve tread edge load resilience). CDI ® CO ® • . Page 5 of 9 C:\Users\mrumsey\Documents\Resolution No.21-24 Trail and Pathway Design and Construction Standards.docx E. Trail and Pathway Finished Grade—Landscaped 1. All City maintained trails and pathways more than 6-feet in width that are surrounded by, or adjacent to landscaping shall be required to utilize the following elements in landscaped areas: a. Install a 24-inch(depth) BioBarrier along both sides of the tread in any area within 15-feet of a tree drip line or 30-feet from any tree trunk, whichever distance is greater. No BioBarrier is to be placed with a running-length of less than 30-feet, and no gaps of less than 30-feet will exist between BioBarrier sections. Installed BioBarrier top edge must be within 1-inch of the grade prior to installation of gravel margin. b. Install 5.5-inch-tall metal lawn edging outside of the BioBarrier as shown below. Note: fastening the BioBarrier to the lawn edging (minimum 3-inch overlap)prior to backfilling will improve BioBarrier function and ease installation. (Edge material equivalent to Sure-Loc Sure-Edge 3/16"x 5.5") c. A compacted finish grade along the sides of the(minimum of 3-feet wide) shall be sloped a minimum of 2%drainage(sloping away from tread)but a maximum of 5% for erosion resistance. No adjacent grades shall drain across the tread unless approved by the City. d. Install a 3-inch-depth of gravel adjacent to the tread. Gravel bed must extend a minimum of 3-feet and a maximum of 4-feet from the finished tread. Gravel level shall be 1-inch below the tread edge to reduce spread onto the tread.Crushed gravel with a minimum hardness of basalt and screened particles between 3/8-inch and 3/4-inch shall be used. Note: No irrigation elements may be placed in this area. e. Install grass seed or sod as approved in City approved landscape plan. 0 ‘1, O O 0 ti Page 6 of 9 C.\Users\mrumsey\Documents\aesolution No"21-24 Trail and Pathway Design and Construction Standards.docx F. Trail and Pathway Finished Grade—Natural 1. All City maintained trails and pathways more than 6-feet in width that are located in areas where landscaping is not required or approved may include those with trails or pathways along waterways, in canal easements, or in natural and unimproved foothills settings, and must include the following elements: a. Install a 24-inch (depth) BioBarrier along both sides of the tread in any area within 15-feet of a tree drip line or 30-feet from any tree trunk, whichever distance is greater. No BioBarrier is to be placed with a running-length of less than 30-feet, and no gaps of less than 30-feet will exist between BioBarrier sections. Installed BioBarrier top edge must be within 1-inch of the finish grade to help prevent tree roots from migrating over the top-edge. b. A compacted finish grade along the sides of the tread (approximately 3-feet wide) shall be 1-inch below the tread edge, shall be sloped a minimum of 2% drainage (sloping away from tread) but a maximum of 8% for erosion resistance. No adjacent grades shall drain across the tread unless approved by the City. b b___ Page 7 of 9 C:\Users\mrumsey\Documents\Resolution No.21-24 Trail and Pathway Design and Construction Standards.docx G. Modified Levee Construction 1. The following specification may be approved by the City for trails and pathways located in areas where narrow existing compacted earthen structures are the only available alignment option. These areas may include those with trails or pathways located along a waterway, in canal easements, or in natural and unimproved foothills settings, and may be approved to utilize the following elements.: a. Preserve and protect the area between the planned tread edge and top of bank during construction to protect undisturbed soil and vegetation. b. Preserve and protect below top of bank. No improvements or fill may be added to this area without City approval. c. Apply monobar-chlorate and Trifluralin to base per manufacturers specifications. Below an installed weed fabric (4 oz.Non-woven geotextile filter fabric) under the entire area under the 4-inch layer of 3 -minus. d. Install 4-inches of 3 -inch minus crushed gravel base compacted to 95%. 3 - inch minus layer is to extend 6-inches beyond both outer edges of the tread material (intended to improve tread edge load resilience). e. Construct the required tread surface as specified in Section C to the City approved width. O4!) O END OF CITY OF EAGLE TRAIL AND PATHWAY DESIGN AND CONSTRUCTION STANDARDS Page 8 of 9 C:\Users\mrumsey\Documents\Resolution No.21-24 Trail and Pathway Design and Construction Standards.docx This resolution shall be in full force and effect immediately upon its adoption and approval. ADOPTED by the Eagle City Council, Eagle, Idaho, this 14th day of December, 2021. APPROVED: Jas's n Pi•rce, Mayor ATTEST: pGC :••R Q0R A TF•.:K : Tracy 0 , City Clerk ? u; o -•� 1, • O • .U p. S� i S r ''•.,,STATE p ..•. s Page 9 of 9 C:\Users\mrumsey\Documents\Resolution No.21-24 Trail and Pathway Design and Construction Standards docx