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23 March 2001 . AGE-NC Project No 95-0130 Page 3 of 6 I water All nnseate 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 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(D1PE), 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 lie • Total lead by EPA Method 6010/200 7 24 LABORATORY RESULTS OF "GRAB" GROUND WATER SAMPLES ' A total of fifteen "grab" ground water samples were collected from P-10, P-11 and P-12 and submitted for laboratory analysis for the above mentioned constituents ' TPH-g impact was not detected in any of the five ground water samples collected between 20 and 120 feet bsg in boring P-10 TPH-g was detected in three water samples collected from P-11 at depths of 41 to 44 feet bsg, 92 to 95 feet bsg and 117 to 120 feet bsg at concentrations as high as ' 1,800 micrograms per liter(4g/l), and in four water samples collected from P-12 at depths of 17 to 20 feet bsg, 43 to 46 feet bsg, 93 to 96 feet bsg and 116 to 119 feet bsg at concentrations as high as ' 7,500 ktgll The laboratory reported all the above sample chromatograms as having significant unmodified or weakly modified gasoline patterns ' TPH-d impact was not detected in any of the five ground water samples collected between 20 and 120 feet bsg in boring P-10 TPH-d was detected in three water samples collected from P-11 at depths of 41 to 44 feet bsg, 92 to 95 feet bsg and 117 to 120 feet bsg at concentrations as high as ' 1,000 gg/l, and in four water samples collected from P-12 at depths of 17 to 20 feet bsg, 43 to 46 feet bsg, 93 to 96 feet bsg and 116 to 119 feet bsg at concentrations as high as 2,300 kig/l The laboratory reported the three sample chromatograms from P-11 as having significant gasoline range, ' Advanced GeoEnvironmental,Inc