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is observed, and a conceptual subdrain plan shall be prepared ance <br /> grading plans have been,finaliz�d. <br /> o) A geoteclmical engineeir sha11 be on site during or j�st following <br /> heavy rainstortns to evainate and map xhe locatioas of springs on the <br /> site,and provide recomtnenda�ons far mitigatxng the adverse <br /> impacts af springs or seepa,if necessary. <br /> p) The sha�low laadslide area on Lots 14 and i 5 shall be completely <br /> removed down to bedrock,and#he grade rebuilt with a keyed and <br /> benched engincered buttress fill containing subdrains. <br /> c� Further ev�luatiom of the questionable Zaadslide near the botkam of <br /> T.�ts 3 and 4 shail be performed during the design level geoteclmical <br /> invesdigatians for I.ot� 1 t�ro�gh 4 ta pmvicie detailed <br /> �ecnmmendations for keyways,benching, and subdrains. The t�esign- <br /> level geotechnioal investigatian shall detern�ine whethez midgation <br /> is needed ta rednce the patential for damage to the planned site <br /> imprtivements and the potential far adversalp affiecting neigbboring <br /> P�P��- <br /> r} The bottam af fihe bio-retention basins on Lots 5, 7, S,9,aitd l 0 shall <br /> be lined with HDPE liner to limit w�ter infiltration inta the native <br /> soils below the peimeable filter soils.A subdrain shaSl be instalXed <br /> above the HDPE liner to intercept the extess wata'and direct it to a <br /> suitable di�harge point. The apecific recammendations for the <br /> HDP�Yiner system and sub�ains sha11 be presented in the design- <br /> level geotechnica�report. <br /> s) The outfall for the bio-�ten#ion�asins shall relesse thc dischargc <br /> near tlie base of the seasonal cre�k and sha1l not be allowed to flow <br /> over the tap of the creek bax�s. <br /> t) Cut-of�plugs cansisting af controlled density fil�about 2 faet wide <br /> and keye�into the native sai�a sball be installed at 25-to 50-foot <br /> intervals along a11 pipeline trenches and at the beginning,midpoints, <br /> and ends of the culvert and a�]36-inch-diame#er detention pipes. <br /> Specific recommendations for the cut-offplugs shall be gresented in <br /> tha design-level geat�hnical report� <br /> u) All proposed struatures shall be designed u.�a.ccardance with the <br /> seismic design criteria af the 2410 Califoraria Building Code(CBC) <br /> or other recent applicable building cade. <br /> v) Cut areas in serpentinite and exposed fill slapes composed of <br /> serpentinite rock ahafl be r,apped with asbestas-free soil. <br /> l�nding: Irnplem�tation of Mitigation Measure Geolog,y-I would reduce impacts from <br /> exposure to asbestos fram serpent�mite to a less than sig�ificazxt level. <br /> Fact�in Support of ItYmding: Implementation of Mitigation M�asure Geolagy-1 would reduce <br /> impacts from exposure to asbestas from serpentinite by roquiri.ng testang of <br /> serpentinite for asbestos prior to any const�uction activi�ies and implementation of <br /> measures to prevent the release of asbestoa should asbes�s prove to be present <br /> 31 <br />