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07 February 2001 AGE-NC Project No 95-0130 Page 3 of 8 ' 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 Method 5030/8015M, ' • Volatile aromatic compounds including benzene,toluene, ethylbenzene and xylene (BTEX) and methyl-tertiary butyl ether(MTBE) by EPA Method 8020, and • Volatile organic compounds including methanol, ethanol, ethylene dibromide (EDB), 1,2- 1 dichloroethane(1,2-DCA),tertiary butanol(TBA), di-isopropyl ether(DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether(TAME), and confirmation of MTBE by EPA Method 8260 24 LABORATORY RESULTS OF "GRAB" GROUND WATER SAMPLES A total of eighteen "grab" ground water samples were collected from P-7, P-8, P-9 and P-10 and ' submitted for laboratory analysis for the above mentioned constituents TPH-g was detected in three water samples collected from P-7 at depths of 73 to 76 feet bsg, 101 ' to 104 feet bsg and 129 to 132 feet bsg at concentrations as high as 590 micrograms per liter(ug/1), in four water samples collected from P-8 at depths of 50 to 53 feet bsg, 83 to 86 feet bsg, 112 to 115 feet bsg and 134 to 137 feet bsg at concentrations as high as 850µg/l, in one water sample collected ' from P-9 at a depth of 115 to 118 feet bsg at a concentration of 270µg/l, and in three water samples collected from P-10 at depths or 29 to 32 feet bsg, 59 to 62 feet bsg and 82 to 85 feet bsg at t concentrations as high as 520µg/l The laboratory reported all the above sample chromatograms as not having typical gasoline patterns except two samples from P-8 at 50 to 53 feet bsg and 83 to 86 feet bsg ' TPH-d was detected in four water samples collected from P-8 at depths of 50 to 53 feet bsg, 83 to 86 feet bsg, 112 to 115 feet bsg and 134 to 137 feet bsg at concentrations as high as 110 4g/1, in two water samples collected from P-9 at depths of 63 to 66 feet bsg and 83 to 86 feet bsg at concentrations of 61 and 270 µg/1, respectively, and from P-10 at depths of 29 to 32 feet bsg, 82 to 85 feet bsg and 133 to 136 feet bsg at concentrations as high as 460 4g/1 The laboratory reportcd ' the foul sample chromatograms from P-8 as not having typical diesel patterns . Vanous BTEX compounds were detected to four water samples collected frorn P-8 at depths of 5(I ' Fldvanced(,eoEnvironment d !nc