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