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8.A. - Page 44 <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 />Mitigation Measure Geology -2: A design -level geotechnical investigation shall <br />be completed for each lot and for the utility improvements on Laurel Way. The <br />geotechnical investigation shall include: <br />a) Evaluation of the layout of proposed underground utilities, exterior <br />hardscape, and retaining walls to evaluate whether surficial soil <br />creep would impact these structures; <br />b) Detailed surface and subsurface explorations performed for each lot <br />during the design -level geotechnical investigation; data from these <br />investigations shall be used to generate foundation design criteria; <br />c) Consideration of the need for extra steel reinforcement of piers and <br />grade beams, voids beneath grade beams to mitigate uplift distress to <br />the structures, perimeter subdrains and moisture barriers, and <br />measures implemented during construction to prevent concrete over - <br />pours at the tops of the drilled piers; and <br />d) Consideration of impacts arising from excavations of foundation <br />elements, including drilled piers. <br />Recommendations in the design -level investigation report shall be implemented, <br />as approved by Redwood City. At a minimum, the recommendations shall <br />include: <br />a) Recommendations for mitigating slope instability during <br />construction, if necessary, by utilizing temporary excavation support <br />systems or grading controls; <br />b) Recommendations for corrective grading measures to replace <br />existing undocumented fill with engineered fill; <br />c) Recommendations to reduce impacts to utility facilities arising from <br />differential movement related to expansive soils; <br />d) Recommendations to reduce impacts to shared hardscape (i.e., <br />roadways and sidewalks) from expansive soils; <br />28 <br />