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, t 28 April 2004 • AGE-NC Project No-99-0570 Page 2 of 6 s a , and Greig, J , 1986) and displayed the interpreted lithologies on a continuous CPT bonng'log The CPT interpretive logs are presented in Appendix A f Rmseate generated during drilling activities was containenzed in properly labeled DOT-approved 55-gallon drums and was stored on-site to an area lacking public access The CPT soil bonngs were backfilled over their entire depth range with a bentonite/portland cement grout mix 2 2 GROUND WATER SAMPLE COLLECTION IGrab ground water samples were collected In a twin soil boring advanced immediately adjacent to the initial CPT boring The samples were collected utilizing the 25-ton truck-mounted CPT drill rig equipped with 1 75-inch diameter hollow-stem rods fitted with a HydroPunch ground water sampling assembly, which was pushed to specified sampling depths in each soil boring Diagrams of the sampling assemblies are illustrated in Appendix A ' r Ground water samples were collected from specified depth intervals (zones)based on the acquired ICPT-llthology data indicating favorable conditions for sampling A HydroPunch sampling tool was . pushed into the specified zone,then withdrawn approximately five feet to expose an inlet screen,the Interior of the sampling tool filled with water and a 1-inch outer diameter(O D )stainless steel bailer Was lowered and utilized to extract a ground water sample Ground water samples were collected from CPT boring locations at the following intervals I • CPT-1 was sampled between 55 feet and 60 feet bsg and between 80 feet and 84 feet bsg, • CPT-2 was sampled between 55 feet and 60 feet bsg, between 89 feet and 94 feet bsg and Ibetween 110 feet and 114 feet bsg, and • CPT-3 was sampled between 55 feet and 60 feet bsg, between 85 feet and 90 feet bsg and between 110 feet and 114 feet bsg I Following sample collection, the samples were placed in laboratory-supplied containers, properly labeled and transported under chain-of-custody to McCampbell Analytical Inc (MAI), a State of California Department ofHealth Services(DHS)-certified laboratory All samples were analyzed for • Total petro Icum,hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Method 8015-Modified, and • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and the fuel additives methyl tertiary-butyl ether MTBE, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), IAdvanced GeoEnvhronmental,Inc