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Ceelogical Technics inc Page 4 <br /> Additional Site Characterization Report <br /> Project No 662 2 <br /> February 20,2004 <br /> ' Well No. Diam./TD Screen Slot Sand Pack Transition <br /> Grout Seal <br /> (in/ft) Interval (ft) (in) (ft) Seal (ft) (ft) <br /> ' MW-104 2"I55' 48-53' 0 010 45-55' 43-45' 43'-surface <br /> ' Before installing the bentonite seal the well was bailed using a 2-inch diameter steel bailer <br /> to achieve maximum filter pack density and remove fines A weighted bentonite pellet <br /> transition seal was then installed above the sand filter pack The surface seal was achieved <br /> ' by pumping a neat cement grout (augmented with < 4% bentonite) through a 1-inch <br /> diameter PVC tremmie pipe lowered into the augers The grout was pumped as the augers <br /> were withdrawn to ensure that an integral grout seal was achieved The well was secured <br /> ' with a locking watertight cap encased in flush mounted traffic rated well box <br /> 1 Well construction is detailed on the boring log included in Appendix C <br /> 2.1.2 Soil Sampling Procedures <br /> ' Soil samples were obtained from MW-104 at 23 and 53 feet bgs by driving 6-inch brass <br /> tubes into the core barrel sampler The soil samples were then sealed with Teflon sheets, <br /> capped, labeled and placed in a cooler at 4° Celsius for transport to the laboratory following <br /> Chain of Custody protocol <br /> ' 2.1.3 Soil Laboratory Analyses <br /> The soil samples collected on May 30, 2002, were delivered to Sherwood Labs (Department <br /> of Health Services Certification No 1400) of Hilmar, California, for analysis The samples <br /> were analyzed for <br /> • Benzene, Toluene, Ethyl Benzene and Xylene(BTEX) by EPA method 8020 <br /> ' o Total Petroleum Hydrocarbons as Gasoline (TPH-G)by EPA method 5030/8015(M) <br /> ' Sherwood forwarded samples to Entech Analytical Labs (Department of Health Services <br /> Certification No 2346) of Santa Clara, California, for analysis of <br /> • Oxygenated Fuel Compounds (MTBE, DIPE, ETBE, TAME & TBA) by EPA <br /> ' method 8260 <br /> The results and the detection limits for these analyses are listed in Table 1 of Appendix A, <br /> while the lab analytical results are presented in Appendix B <br /> As required under AB2886, the laboratory data were submitted electronically to GeoTracker <br /> ' on January 10, 2003 (confirmation #s 7523414492) <br />