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II V <br /> ( ! J <br /> t S � <br /> �. 15 May`2000 <br /> AG� E-NC Project No 95-0135 <br />' Page 2 of 4 <br /> s, <br /> S 1 y 1 <br /> i <br /> L 1 S <br />' chain-of-custody, to Pi ectsion Enviro-Tech(PET) of Stockton, a State of California Department of <br /> ' 'Health Sei vices (DHS)-certified laboratory, for analytical analysis The samples were analyzed for <br />' Total petroleum hydi ocarbons quantified as gasoline (TPH-g) In accordance with EPA <br /> Method 8015 Modified, <br /> i <br />' • Volatile al omatics benzene,'toluene, ethyl,benzene and total xylene (BTEX), oxygenating <br /> compounds Including methyl tertiary-butyl ether (MTBE), tertiary-butyl alcohol (TBA), di- <br /> isopropyl ether (DIPE), ethyl ternary-butyl ether (ETBE) and tertiary-amyl methyl ether <br />' (TAME) in accol dance with EPA Method 8260 Modified <br /> 1 , <br />' 3.0. FINDINGS <br /> G ound water flow direction and gradient were inferred from field data, petroleum hydrocarbon <br /> IImpact on ground water was quantified by the results of laboratory analysis <br />' 3 1 'GROUND WATER ELEVATION AND GRADIENT <br /> i <br /> Dui Ing the March 2000 monitoring event, depths to ground water in wells MW-1 through MW-3 <br />' were measured between 22 90 and 24 19 feet below the tops of the well casings The gr ound water <br /> elevations were calculated to be between -i 1 00 feet and -11 35 feet below mean sea level r <br /> Dui Ing the March 2000 monitoring event the shallow ground water under lying the site flowed to the <br /> ` northeast under a gradient of 0 017 ft/ft The ground water elevation data for MW-1 B thI ough MW- <br /> 3B dut tng the March 2000 ground water monitoring event is depicted on Figure 3 Dui ing the March <br /> 2000 monitor Ing event the deeper ground water underlying the site flowed to the southeast with a <br /> y ' gradient of 0 001 ft/ft The ground 'water elevation data for MW-1A thiough MW-3A duling the 1 <br /> March 2000 ground water monitor Ing event is depicted In Flgurc 4 <br />' 32 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> Excluding sample MW-3A, TPH-g was detected ui the ground water monitoring wells at - <br />' concentrations ranging from 520 pg/l in MW-3B to 20,800 µg/l in MW-213 <br /> Benzene was detected in samples MW-k, MW-1 B,,MW-2A and MW-2B at concentrations of 310 <br /> µg/l,70 µg/l, 175 µg/1 and 82 µg/1,respectively The I emarntng BTEX compounds were also detected <br /> in these four wells at concentrations ranging from 2 5 µg/l (toluene In MW-1B) to 193 µg/1 <br /> x <br /> 1 r Advanced GeoCnvkronmental,Inc <br /> 4 1 <br />