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r 4 <br /> I � ,n �F r r "' i fi, Yrt.. ' + r z r . i v " _ 9 —` •— v , ' r ' I <br /> — ' 3 ✓ Se , f <br /> 14 November 1995 4 � <br /> 3 AGE-NC Project No 95-0121 ; <br />' r Page 3 of 20 <br /> r ; <br /> conducuvity Stabilization data were collected at one-gallon intervals using an ICM water analyzer <br /> ` Field parameter data sheets*are included in Appendix A Purged water was placed in 55-gallon drums <br /> < for temporary storage on-site } <br /> F <br /> 3 2 COLLECTION OF GROUND WATER SAMPLES ' <br /> 41 ' <br /> Ground water samples were collected from each well using new disposable bailers The samples were <br /> collected in 40-m1 EPA vials preserved with hydrochloric acid and one-liter amber bottles and,were <br /> transported in a chilled container to ABC Laboratories, Pan-Ag Division (Pan-Ag) in Madera, <br /> California Each sample was analyzed for TPH(gasoline and diesel) and volatile aromatics(benzene, ; <br /> toluene, ethylbenzene and xylede BT-&X) in accordance with EPA methods 8015m and 602, <br />' respectively ; <br /> I I <br /> 3 3 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> Ground water elevation at the site ranged from -18 22 to -18 67 feet, indicating an average nse of <br /> 0 54 feet between May and July 1995 (Table 1) <br /> I r <br /> The ground water flow direction was determined to be toward northeast (Figure 3) The ground <br /> water gradient was determined to be approximately 0 0013 ft/ft This gradient is more shallow than <br /> the gradient calculated for May 1995 (0 0025 ft/ft) No free product was observed in MW-1 that <br /> I _ would effect,ground water depth measurements n , <br /> I , <br /> , n <br /> n I <br /> 5 r <br />' 3 4 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH as"gasoline was ,detected in samples from MW-1 through MW-4, MW-6 and MW-7 at <br />' concentrations ranging from 740 µg/1 (parts per billion ppb, MW-6) to 26,000 ppb (MW-3) TPH <br /> as diesel was detected in samples from the same wells at concentrations ranging from 230 ppb (MW- <br /> ' I 6) to 2,500 ppb (MW-3) <br /> Benzene, toluene, ethylbenzene and xylenes were detected at concentrations as high as 8,100 ppb <br /> (benzene, MW-3) Analytical results of ground water samples are summarized in Table 2 The u <br /> laboratory report and chain-of-custody form are included in Appendix B <br /> , <br /> I r <br /> •, ' l i , ,I S <br /> F I <br /> Y- <br /> , I , <br />