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i I <br /> E I <br /> 10 January 1997 <br /> AGE-NC Project No 95-0144 ' <br /> Page 2 of 3 <br /> 1 <br /> transferred into 40-ml EPA vials containing 035 ml of 181/o hydrochloric acid as a preservative and <br /> into 1-liter amber bottles The samples were transported in a chilled container to McCampbell a <br /> ' Analytical, Inc (MAI) in Pacheco, California and were analyzed for total petroleum hydrocarbons <br /> quantified as gasoline (TPH-g), diesel (TPH-d), and motor oil (TPH-mo) and,volatile aromatic I <br /> ' 'I compounds (benzene, toluene, ethylbenzene and xylenes, BTE&X) with methyl-tertiary-butyl-ether <br /> (MTBE) in accordance with EPA methods 5030 and 602, respectively <br /> - 9 I i <br /> I Y, <br /> 3.0. , FINDINGS <br /> - 3"1 RELATIVE GROUNDWATER ELEVATION AND GRADIENT , <br /> The relative elevation of ground water in each well was calculated by subti acting the depth to water <br /> from the surveyed casing elevation(Table 1) Ground water elevation decreased an average of 0 64 <br /> feet between August and November 1996 The approximate gradient for the November 1996 <br /> monitoring A as calculated to be 0 0048 ft/ft with a northerly flow direction Ground water elevation <br /> contours derived from,data collected on 05 November 1996,are depicted in Figure 3 <br /> 32 ANALYTICAL RESULTS OF WATER SAMPLES F <br /> ' During the November 1996 monitoring event,TPH-g was detected in wells MW-I, MW-5 and MW- <br /> 13 at concentrations as high as 1,300 parts per billion(ppb, reported as micrograms per liter),TPH-d , <br /> was"detected in wells MW-1, MW-2 and MW'5 at concentrations as high as 220 ppb TPH-mo was �a <br /> not detected in samples collected during the November 1996 monitoring event The highest <br /> concentration of xylenes was detected in the sample from MW-1 at 390 ppb The same sample was <br /> also found to contain benzene at 16 ppb Petroleum hydrocarbons NN ere not detected m wells MW-8; ! <br /> MW-11, MW-12 or MW-18 ; <br /> ' Analytical results of ground water samples are summarized on Tables 2 and 3 The laboratory report <br /> y .(MAI Laboratory I D Nos 71037 - 71045) and chain-of-custody forms are included in Appendix <br /> B <br /> f <br /> E I <br /> 4.0. CONCLUSIONS AND RECOMMENDATIONS ; <br /> 41 CONCLUSIONS <br /> ' Based upon data collected from the site, the following conclusions are presented <br /> , I <br />