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Mr Nuel Henderson, SJCFHD April 7,2006 <br /> Well Installation Report <br /> ARCO Facility No 5469 <br /> Stockton,California <br /> Page 5 <br /> Surveying <br /> Morrow Surveying, Inc of West Sacramento, California, surveyed the elevations and <br /> locations of each newly installed monitoring well The Iocations of wells IW-1 through IW- <br /> 5, and boring CPT-1, were also surveyed at this time Monitoring well elevations were <br /> established to the nearest 0 01 vertical feet, and tied to a previous survey completed at the <br /> site Latitudes and longitudes of all wells were established using the Global Positioning <br /> System (GPS) California State Plane Coordinates, latitudes and longitudes of the wells, <br /> and well elevations are included on the surveyor's map presented in Appendix D Well <br /> survey data was forwarded to the California State Water Resources Control Board for <br /> inclusion in the Geotracker database <br /> Waste Management <br /> Soil cuttings generated during drilling was placed in DOT-approved, 55-gallon steel drums <br /> and stored on-site pending disposal Dillard Trucking Company of Byron, California, <br /> transported the soil cuttings to a licensed facility for disposal <br /> . Analytical Methods <br /> Soil and groundwater samples were forwarded to Sequoia Analytical, Inc , a California <br /> state-certified laboratory (ELAP #1210), for chemical analysis under stnct chain-of-custody <br /> procedures The samples were analyzed for gasoline range organics (GRO), benzene, <br /> toluene, ethylbenzene, and xylenes (BTEX constituents), MTBE, ethyl tertiary butyl ether <br /> (ETBE), di-isopropyl ether (DIPE), tertiary amyl methyl ether (TAME), TBA, <br /> 1,2-dichloroethane (1,2-DCA), 1,2-dibromoethane (EDB), and ethanol using USEPA <br /> Method 8260B Soil analytical results are presented in Table 2 and groundwater analytical <br /> results are presented in Table 3 Certified Analytical Reports with chain-of-custody records <br /> are presented in Appendix E <br /> FINDINGS <br /> Site Geology and Hydrogeology <br /> Based on data collected during this investigation and previous subsurface assessment <br /> activities, silt and clay mixtures, and thin, discontinuous lenses of silty sand, have generally <br /> been encountered between surface grade and 120 feet bgs Stratus personnel predominately <br /> observed clay and silty clay from surface grade to the base of well borings MW-11 through <br /> MW-13, sand with silt (less than 2 feet known thickness) was observed near the base of <br /> boring MW-12 <br /> K lBp-Arco for URS\5469\Reports\ARC05469-wellreport2006 doc 5TRATU5 <br />