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AUGUSTIN BERNAL MOUNTAIN BIKE TRAIL PROJECT DRAFT INITIAL STUDY <br /> 12956 <br />DUDEK 10 April 2022 <br />Construction Activities and Methods <br />Construction of the proposed project would require minor grading and vegetation clearing along the entire bike trail <br />alignment. The trailbed and construction area for the proposed trail and the trails to be decommissioned covers <br />approximately 0.76 acres. This includes the trailbed and trails to be decommissioned within the City’s existing 237- <br />acre Augustin Bernal Community Park and the portion of trailbed within the Golden Eagle HOA property. The City <br />would need to obtain an access easement across the Golden Eagle HOA property to allow for trail construction and <br />long-term use. <br />Construction activities and methodology would include the following: <br /> Clearing and grubbing of shrubs and groundcover vegetation and trimming of tree branches that could <br />impede the vertical clearance along the trail. No tree removal is proposed. Cleared and grubbed vegetation <br />may be chipped and spread on site or may be removed and disposed of off-site. Tree branches may be <br />used on site to define trail edges and block access to existing unofficial trail spurs. <br /> Some rocks, existing downed tree branches, and existing downed tree trunks may be moved off of the trail <br />surface and used to define trail edges, create trail features (jumps), and/or block access to existing <br />unofficial trail spurs. <br /> Grading the trail surface to create a trailbed, berms, turns, jumps, and other trail features, as well as to <br />create grade changes to provide for appropriate erosion and drainage control. <br /> It is assumed that construction activities would be performed continuously during daylight hours throughout <br />a 3-month period between May 1 and October 15 in 2022 or 2023. <br />Decommissioning the user-created trails would include the following: <br /> Removing existing rock and any logs or wood edging where it occurs along the existing trail edges and <br />redistributing those materials within the trail decommissioning area to mimic a random and natural layout. <br /> Refilling holes resulting from the decommissioning operations. <br /> Shallow-ripping soils to decrease compaction. <br /> Broadcasting native plant species seed mix to revegetate decommissioned areas. The seed mix would <br />include common yarrow (achillea millifolium), California brome (bromus carinatus), Miner’s lettuce <br />(claytonia perfoliate), blue wildrye (elymus glaucus), Douglas iris (iris douglasiana), sticky monkeyflower <br />(mimulus aurantiacus), purple needlegrass (nasella pulchra), blue eyed grass (sisyrinchium bellum), native <br />clover (trifolium ciliolaturm), and small fescue (vulpia microstachys). <br />Grading <br />To construct the proposed project, nearly the entire trail would require grading to some extent, with grading cuts <br />generally at a maximum of 0.5 feet in depth. It is expected that the majority of the soil removed would be reused <br />on site to create grade changes, berms, and other trail features. It is estimated that the proposed project would <br />require approximately 68 cubic yards of earthwork. Soils cuts and fills would be balanced on site, so no soil export <br />would be needed. Up to 15 cubic yards of dirt and/or rock would be imported to build berms and other trail features.