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y r l 10 December 2001 AGE,NC Project No 00-0769 Page 3 of 6 ' withdrawn approximately three to five feet to expose an inlet screen The Interior of the sampling tool filled with water and a'h-inch outer diameter(O D ) stainless steel bailer was utilized to extract a ground water'drnple Ground water samples were�collected from each depth interval(zone),based ' on previously acquired CPT-lithology data indicating favorable conditions` for sampling ground water All rinseate generated during drilling activities was containerized 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 properly labeled sample was logged on a chain-of-custody form, placed in a chilled container and transported to McCampbell Analytical, Inc (MAI), a California r Department of Health Services (DHS)-certified laboratory for analysis for ` Total petroleumhydrocarbons quantified as gasoline(TPH-g)by EPA Method 5030/8015M, • Volatile aromatic compounds including benzene, toluene, ethylbenzene and xylene (BTEC) ' and methyl-tertiary butyl ether (MTBE) by EPA Method 8020, and • Volatile organic compounds including methanol, ethanol, ethylene dibromide (EDB), M1,2-dichloroethane(1,2-DCA), tertiary butanol(TBA), dn-isopropyl ether(DIPE), ethyl tert butyl'ether (ETBE), tert amyl methyl ether (TAME), and MTBE by EPA Method 8260 ' f 25 LABORATORY RESULTS OF"GRAB" GROUND WATER SAMPLES R ` ' Y A total of 29 'grab" ground water samples were collected from the'informal hydrologic units from CPT-01 through CPT-06 and,were submitted for laboratory analysis for the above mentioned constituents Tables 3, 4 and 5 were each sample collected to the hydrologic unit from which it was collected TPH-g was detected in one ofthe two samples collected fromthe First Water- Upper Zone, CPT-01 at a concentration of 78,000 micrograms liter gr per (µg/l),the CPT-02 sample was non-detect TPH-g was detected in all four samples collected from First Water-Middle Zone at concentrations ranging from 3,200 µg/1(CPT=03) to 110,000 µg/l (CPT-06, located near former USTs No 1 and No 2), in nine samples collected from the First Water-Lower Zone'at concentrations ranging from 1,900 µg/l (CPT-03)to 140,000 µg/I(CPT-06), in five of the six samples collected from the Second Water Zone at concentrations raning from 120 µg/1(CPT-01) to 27,000 µg/l (CPT-05, located near the former UST No'3), the CPT-3"sample was non-detect Concentrations of TPH-g were detected in five of the six samples collected from the Third Water Zone ranging from 56 µg/l(CPT-04) to 68,000 µg/1 (CPT-05),the CPT-03 sample was non-detect TPH-g was detected in the one sample collected from the Fourth Water Zone at a concentration of 29,000 µg/1(CPT-06) One sample collected from CPT- ' Advanced GeoEnvironniental,Inc 5