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' 15 March 2002 AGE-NC Project No 97-0249 Page 5 of 10 ' 2 5 CPT DRILLING AND GROUND WATER COLLECTION PROCEDURES A 25-ton truck-mounted CPT drill ng equipped with 2-inch diameter hollow-stem rods fitted with a HydroPunch ground water sampling tool utilized a hydraulic ram to advance to specified depths in each soil boring (Appendix B) A HydroPunch sample tool was pushed into the specified zone, then withdrawn approximately three feet to expose an inlet screen The interior of the sampling tool filled with water and a %2-inch outer diameter (O D ) stainless steel bailer was lowered and utilized to extract a ground water sample Ground water samples were collected from each selected depth interval (zone)based on previously acquired CPT-hthology data indicating favorable conditions for sampling ground water All rinseate generated during drilling activities was contamenzed in properly labeled DOT-approved 55-gallon drums, and was stored on-site in an area lacking public access All soil borings were backfilled over their entire depth with a portland cement grout mix Following sample collection, each preserved sample was logged on a chain-of-custody form, placed in a chilled container and transported to a California Department of Health Services (DHS)-certified laboratory for analysis for • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively) by EPA Methods 8015M/5030 and 8015M/3550, respectively, • Volatile aromatic compounds - benzene, toluene, ethylbenzene and xylene (BTEX) by EPA Method 8020, • Fuel oxygenated compounds - tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether(TAME), methanol, ethanol and MTBE by EPA Method 8260M, and • Ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) by EPA Method 8260M • Total lead by EPA Method 6010/200 7 26 LABORATORY RESULTS OF GRAB GROUND WATER SAMPLES ' A total of thirty grab ground water samples were collected from soil bonngs P-13, P-14, P-15, P-16, P-17 and P-18 in November 2001 and submitted for laboratory analysis for the above mentioned. Iconstituents Six grab water samples were collected from Hydrologic Unit No 1 (between 10 feet and 35 feet ' bsg) TPH-g was detected from water samples collected from P-15, P-16 and P-17 at concentrations as high as 1,100 micrograms per liter (ug/l), TPH-d was detected from all six water samples at concentrations as high as 460 E.tg/l,BTEX constituents were detected from P-14,P-15, P-16 and P-17 Advanced CeoEnwronmental,Inc