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2 E�avi���amental,f�naly�is <br /> • If the NAHC-appointed MI.,D,Caltrans, and the City cannot reach an agreement within <br /> 48 hours, the landowner or his or her representative shall rebury t�te Nari�-e American <br /> remains on a site where no futthex subsuxface distutbance would occur; <br /> • Ground-disturbing activities may resurne after the County Coroner and the appropriate <br /> law enforcement authority�ave released the area for construcuon. <br /> With the implementation of this mitigation measure,the potential unpacts to human remains would <br /> be less than significant. (Less than Significant Impact with Mitigation Incorporation) <br /> 2.fi GEOLOGY AND SDILS <br /> The Geotechnfcal Design Report prepared by CaI Engineering&Geology,Inc. (CE&G) describes <br /> the exisring geologic setting of the project area, evatuates proJect impacts,ana contains site-level <br /> design recommendations for mitigating potential impacts associated with geologic hazards (see <br /> Appendix F�. The City is located within the San Francisco Bay Area,a seismically acrive region at the <br /> boundary of North American and Pacific plates that is susceptible to geologic hazaxds such as <br /> earthquake ruptures, seismic ground shaking,and gtaund-failure and coatains areas subject to <br /> liquefacrion and landslides. <br /> Redwood Creek,bordering proJect area to the east,was known as "Redwood Siough"until the <br /> 1950's. During the 1950's-1960's,levee�anks were constructed to raise the creek bank elevarion <br /> above the ridal waters within Redwood Creek. Addirional fill using st�Ff-clap and gravel materials was <br /> added in the project area as development continued. Bay Mud,which is thick and highly <br /> compressible si�ty clay,underlies the fill materials used in the ptoject area. The proposed project area <br /> consists of Urban-land Orthents,reclaimed complex soils with 0 ta 2 percent slopes (CE&G,2d13 <br /> and USGS,2009). <br /> CE&G conducted five geatechnical borings within the proposed project axea at depths of 10-2d feet <br /> using a 4.5 inch solid stem drill with conrinuous augers. Rep�esentative soil samples were collected <br /> from the borings and bagged for analysis. The soils that were encountered duxing diilling of the <br /> botings consisted of artificial fill., alluvium,Young Bay Mud,and Old Bay Mud. Artificial fill was <br /> encountered in all five of the borings and consistea of firm to hard lean clay in four of the samples <br /> and low to medium plas�icity o£sandy silt in one. Alluvium was encountered in two of the five <br /> borings and cansisted of poorlp graded sand and silty elastic sand. Young Bay Mud was encountered <br /> in all five of the borings at various depths 6.0-145 feet and consisted of loose, saft ta very soft wet <br /> clay and elastic silt. OZd Ba�T I�'Iud was encountered in three of the five borings at depths of 13-20 <br /> feet and consisted of firm to hard lean clay (CE&G,2013). <br /> ?-v� US 909 �'edestrian Undercro.ccing arad$air <br /> Island Rnad Storrrz Drain Pump Statio�a Project <br />