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8.A. - Page 40 <br />s) The outfall for the bio -retention basins shall release the discharge near the <br />base of the seasonal creek and shall not be allowed to flow over the top of <br />the creek banks. <br />t) Cut-off plugs consisting of controlled density fill about 2 feet wide and <br />keyed into the native soils shall be installed at 25- to 50 -foot intervals along <br />all pipeline trenches and at the beginning, midpoints, and ends of the culvert <br />and all 36 -inch -diameter detention pipes. Specific recommendations for the <br />cut-off plugs shall be presented in the design -level geotechnical report. <br />u) All proposed structures shall be designed in accordance with the seismic <br />design criteria of the 2010 California Building Code (CBC) or other recent <br />applicable building code. <br />v) Cut areas in serpentinite and exposed fill slopes composed of serpentinite <br />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 creep would <br />impact these structures; <br />b) Detailed surface and subsurface explorations performed for each lot during <br />the design -level geotechnical investigation; data from these investigations <br />shall be used to generate foundation design criteria; <br />c) Consideration of the need for extra steel reinforcement of piers and grade <br />beams, voids beneath grade beams to mitigate uplift distress to the <br />structures, perimeter subdrains and moisture barriers, and measures <br />implemented during construction to prevent concrete over -pours at the tops <br />of the drilled piers; and <br />d) Consideration of impacts arising from excavations of foundation elements, <br />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 construction, if <br />necessary, by utilizing temporary excavation support systems or grading <br />controls; <br />b) Recommendations for corrective grading measures to replace existing <br />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., roadways and <br />sidewalks) from expansive soils; <br />24 <br />