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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 /> (DWR, Bulletin 118) which straddles the portions of both Sacramento and San Joaquin <br /> Valleys. Sediments of the San Joaquin Valley consist of interlayered gravel, sand, silt, <br /> and clay derived from the adjacent mountains and deposited in alluvial-fan, floodplain, <br /> flood-basin, lacustrine, and marsh environments. Hydrogeologic 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 Formation. The unconsolidated deposits include continental deposits, <br /> lacustrine 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 (EHD). 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 boring application will be submitted for approval. Once the <br /> '- California Department of Water Resources,September 1975,California's Groundwater, Bulletin, 118. <br /> 3 San Joaquin County Flood Control and Water Conservation District,Spring 1999,Groundwater Report. <br /> P\wp\lobs\20587\107153 Grou dwatcr WP.doc <br />