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, - Y ' 23 December 2,004 . ' AGE-NC'Project No.i.95-0106 II,IA „ ..Page 2 of 4 The :samples ;were transported in .a ,chilledcontainer,under chain of custody io Cal Tech Environmental Laboratories,(CTEL), a California Department,of Health Services;(DHS)-certified analytical laboratory, and analyzed for: _ _• d �-er, - -. �- _:g L,. _ ._ - ° ill. Total petroleum hydrocarbons quantified . • , , , - - •' tided as, gasoline (TPH=g) in accordance with i r EPA Method 8015-Modified; , Benzene, toluene, ethylbenzene and xylenes (BTEX); and fuel additives methyl tertiary- butyl-ether(MTBE), tertiary butyl alcohol(TBA), di-isopropyl ether(D1PE), ethyl tertiary- ; butyl ether.(ETBE),tertiary-amyl methyl ether(TAME), 1,2-dibromoethane(EDB),and.1,21 dichloroethane (-1,2-DCA) in accordancewith EPA Method 8260B. . ' 3.0. -FINDINGS f Groundwater elevation and flow direction were inferred from field data. The hydrocarbon-impact ' to Quid water,was quantified b ,laborato analysis of the ground water samples. to q by,laboratory Y 3.1. ; . GROUND WATER ELEVATION AND FLOW DIRECTION ' The relative ground water elevation ranged from 31.86 feet (MW-6 upper)-to 32.70 feet (MW-2),-__ decreasing an average of 0.35 feet since the Sune 2004 monitoring event. The water table appears ' as a northerly•plunging ridge; the east Arid west limbs of the ridge flow.toward the.,northeast and northwest;ies ectivel 'at a adient of approximately 0.006 foot/foot while the•flow adientat the P Y� bn pp Y . . center of the ridge is-approximately 0.003 foot/foot toward the north. Ground water elevation data ' d-.the.contoured ound water elevation data is shown on Figure 3. is presented in Table 1 angr , • g , 3.2. 'ANALYTICAL RESULTS OF GROUND WATER'-SAMPLES '• TPA-,g was ldetected at concentrations of I I Y micrograms per liter(µgd) and.330 µg11-in samples '' t ' from wells MW-,1 and MW-4,re_spectively(Figure 4)'' ' BTEX corripounds were detected in .wells MW 1;and. MW-4 at the following concentrations benzene at 26;µg/1 In MW:-1 and 6$ µg/1 in Mw=4,toluene at 2.2 µg11, ethylbenzene at'38 µg/1 and ! xylenes at,3:4 gg/l in'MW-4 only. No additional;analytes were;detected at or above 'laboratory detection limits in wells`MW-1 and ' ' ' ri limits'in, MW=2 MW-3 . MW-4. No analytes were,detected at or above laboratory detectio ., •, r .46ancedVGeoEnvironmental,Inc.