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Mr. Ross Atkinson <br /> March 30,2001 <br /> Page 3 <br /> The facilities and surrounding areas are located within the San Joaquin Hydrologic Basin <br /> PWR,Bulletin 1182) which straddles the portions of both Sacramento and San Joaquin <br /> Valleys. Sediments of the San Joaquin Valley consist of mterlayered gravel, salad, silt, <br /> and clay derived from the adjacent mountains and deposited in alluvial-fan, floodplain, <br /> flood-basin,lacustrine, and marsh environments. Hydsogeologac units in the San <br /> Joaquin Basin include both consolidated rocks and unconsolidated deposits. The <br /> consolidated rocks include the Victor Formation,the Laguna Formation, and the <br /> Mehrten Fornution. The unconsolidated deposits include continental deposits, <br /> lacustrinc and marsh deposits, older alluvium, younger alluvium, and flood-basin <br /> deposits. The continental deposits and older alluvium are the main water-yielding units <br /> in the unconsolidated deposits. <br /> Groundwater in the vicinity of the facilities may occur at approximately 15 to 20 feet <br /> below grade (bgs). Regional groundwater flow in this area has been reported to the <br /> north-northwest (San Joaquin County Flood Control and Water Conservation District, <br /> 1999). <br /> Filed Activities <br /> This section presents a description of the limited groundwater investigation activities <br /> proposed at the area of the waste reject tile stockpiles located at both facilities and <br /> includes: <br /> • Site preparation and health and safety <br /> • Boring permits <br /> ' Utility clearance <br /> ■ Groundwater sample collection <br /> ■ Analyses <br /> " Field quality assurance/quality control samples (QA/QC) <br /> • Sample storage, transport and analyses <br /> • Equipment decontamination and waste containment <br /> Health and Safety and Site Preparation Activities. A Site-specific Health and Safety <br /> Plan (SSHP) that details safe working practices will be on-site during investigation <br /> activities. <br /> Prior to the commencement of drilling activities, a permit for each groundwater <br /> sampling location will be obtained from the San Joaquin County Public Health Services <br /> Environmental Health Division (1?14D). In addition to a fee per sampling location, <br /> details of the probe hole grouting method, a map indicating proposed sample probe <br /> locations, and a completed boting, application will be submitted for approval. Once the <br /> 2 Califortua Department of Water Resotttres,September 1975,California's Groundwater,Bulletin, 116. <br /> 3 San jm9tan County Flood Conuol and Water Conservation District,Spring 1999,Groundwater Report. <br /> 1':1wp\jobs\20587\TOM3 Groundwater WP.doc <br /> EDV-d 9l0/VOO d ZZl-1 OV692M6 113MOlVO ONV NADH-woad m86g:Ol 1002-OE-adV <br />