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8.A. - Page 47 <br />is observed, and a conceptual subdrain plan shall be prepared once <br />grading plans have been finalized. <br />o) A geotechnical engineer shall be on site during or just following <br />heavy rainstorms to evaluate and map the locations of springs on the <br />site, and provide recommendations for mitigating the adverse <br />impacts of springs or seeps, if necessary. <br />p) The shallow landslide area on Lots 14 and 15 shall be completely <br />removed down to bedrock, and the grade rebuilt with a keyed and <br />benched engineered buttress fill containing subdrains. <br />q) Further evaluation of the questionable landslide near the bottom of <br />Lots 3 and 4 shall be performed during the design -level geotechnical <br />investigations for Lots 1 through 4 to provide detailed <br />recommendations for keyways, benching, and subdrains. The design - <br />level geotechnical investigation shall determine whether mitigation <br />is needed to reduce the potential for damage to the planned site <br />improvements and the potential for adversely affecting neighboring <br />properties. <br />r) The bottom of the bio -retention basins on Lots 5, 7, 8, 9, and 10 shall <br />be lined with HDPE liner to limit water infiltration into the native <br />soils below the permeable filter soils. A subdrain shall be installed <br />above the HDPE liner to intercept the excess water and direct it to a <br />suitable discharge point. The specific recommendations for the <br />HDPE liner system and subdrains shall be presented in the design - <br />level geotechnical report. <br />s) The outfall for the bio -retention basins shall release the discharge <br />near the base of the seasonal creek and shall not be allowed to flow <br />over the top of the creek banks. <br />t) Cut-off plugs consisting of controlled density fill about 2 feet wide <br />and keyed into the native soils shall be installed at 25- to 50 -foot <br />intervals along all pipeline trenches and at the beginning, midpoints, <br />and ends of the culvert and all 36 -inch -diameter detention pipes. <br />Specific recommendations for the cut-off plugs shall be presented in <br />the design -level geotechnical report. <br />u) All proposed structures shall be designed in accordance with the <br />seismic design criteria of the 2010 California Building Code (CBC) <br />or other recent applicable building code. <br />v) Cut areas in serpentinite and exposed fill slopes composed of <br />serpentinite rock shall be capped with asbestos -free soil. <br />Finding: Implementation of Mitigation Measure Geology -1 would reduce impacts from <br />exposure to asbestos from serpentinite to a less than significant level. <br />Facts in Support of Finding: Implementation of Mitigation Measure Geology -1 would reduce <br />impacts from exposure to asbestos from serpentinite by requiring testing of <br />serpentinite for asbestos prior to any construction activities and implementation of <br />measures to prevent the release of asbestos should asbestos prove to be present <br />31 <br />