75D - PH - 2525 N MAIN - Laserfiche WebLink

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EIR Mitiaation Measure Mitigation Measure AES-1: Construction plans and specifications shall state that the following measures shall be implemented by the construction contractor to protect the trees along the eastern Project site boundary and to the extent feasible protect and preserve the existing mature trees within the 15-foot setback along the southern boundary within the 15-foot setback along the southern boundary that are planned for preservation during construction of the proposed Project pursuant to the 2018 Arborist Report: • If the wall along the eastern boundary of the Project site cannot be heightened in -place and must be replaced, it shall be reconstructed with a precast concrete fence or a wall without a continuous footing. • Before finalizing construction plans, a contractor with an AirSpade or AirKnife shall explore the locations adjacent to the preserved trees to locate large lateral roots. The root locations shall be marked, and a survey provided to update the construction plans to avoid cutting any significant large roots. The cutting of small roots shall be planned for late spring or winter and made with clean cuts. No pruning paint or sealants shall be used. • Any grade changes near the preserved trees or pruning of trees to provide clearances for construction equipment shall be coordinated with a Registered Consulting Arborist before construction begins, and precautions pursuant to the arborist's recommendations shall be taken to mitigate potential tree injuries. • Prior to construction, a one -pound soil sample shall be taken from the top 18-inches of soil in each area where trees will be preserved. The samples shall be sent to an appropriate laboratory for analysis and soil supplement recommendations. Fertilization of the preserved trees shall be completed pursuant to the laboratory analysis' soil supplement recommendations. • Prior to construction, augur 6-inch diameter holes about 3 feet deep at a 3-foot spacing between large roots in the more compacted and crowded spaces. Avoid large visible roots, relocating the holes as needed. Start augur holes at three times the trunk diameter, i.e. 6-feet from a 24-inch tree. Back fill with amended soil, based on an agronomic lab's testing and recommendations. • Prior to construction, mulch all exposed soil areas using a topical application of a well -composted, coarse - texture mulch, without manure or bio-solids, e.g. Aguinaga Forest Floor %: to 11/ particle size. Apply it 2- inches deep, but not against the tree trunks. • Deep water before construction and check soil moisture monthly during construction by means of a soil test probe. Slow water with a soaker hose or water spike for 12 hours, or as long as necessary to reach 4-feet deep. • Rinse tree foliage at the end of each work week, using a strong stream of water from a high-pressure nozzle. • During construction in areas without pavement near the preserved trees, 3 or more inches of coarse mulch or tree chips under 1-inch plywood for light vehicle parking and steel plates for larger vehicles is required to prevent compaction and protect surface roots. • Protection Barrier: A protection barrier shall be installed around the trees to be preserved. The barrier shall be constructed of durable fencing material, such as chain link fencing. The barrier shall be placed as far from the base of the tree(s) as possible and shall be maintained in good repair throughout the duration of construction, and shall not be removed, relocated, or encroached upon without permission of the Project arborist. o Storage of Materials: There shall be NO storage of materials or supplies of any kind within the area of the protection barriers. Concrete and cement materials, block, stone, sand and soil shall not be placed within the drip -line of the tree.