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TABLE II Analytical Laboratory Results Sample TPI1 Bc uzcne Toluene F—Benzene Xylenes Total Lead MW-1 (>5?J g 6 3 SS ti 6A $1210 ND MW-2 02(g 87 2.2 103 ND MW-3 ND ND ND ND ND ND ---- ---- --- MW-5 --- ---- --- ---- - MW-6 ND ND ND ND ND ND MW 7 --- --- MW 8 ND ND ND ND ND ND asNIA 1 2000 680 1750 50 NOTES • TPi-1 Total petroleum liydrocarbons analwed per method 8015 modified/purge and trap Results are reported in parts per million(ppm) Detection limit = 0 1 ppm for gasoline(g), 0 2 ppm for diesel fuel (d)and 0 5 ppm for motor oil (mo) • Benzene toluene,ethyl benzene,and total svlenes Aromatic volatile organics analyzed per EPA Method 602 Results are reported in parts per billion (ppb) Detection limit = 0 5 ppb • Total lead Analyzed per EPA method 6010 Results are reported in parts per million (ppm) Detection limit � 0 05 ppm • ND Not detected • NS Not sampled • NIA Not applicable • MCL Maximum Contaminant Levels(MCL s)in parts per hilLon(ppb)per the Sime of California Regionel Water Quality Cattrol Boards A Compilation of Water Quality Goals,November 1989 An MCL for total pttrolcum hydrocarbons has not been esiablishcd • MW-4, MW 5 and MW-7 could not be sampled due to the lack of groundyyater in the sells DISPOSITION OF PURGED WELL WATER Groundwater purged from the monitoring wells prior to sampling was containerized in a 55-gallon drum and stored on the site Following receipt of the analytical data, Ramos Environmental Services of West Sacramento collected and disposed of the purged well water on 12 May 1992 as a non-RCRA, hazardous liquid waste under Uniform Hazardous Waste Manifest number 90382817 CONCLUSIONS The following conclusions are based on data obtained the current and past samplings Figure 2 illustrates the locations of the wells and their corresponding contaminant concentrations • The direction of the local groundwater gradient was calculated to be toward the east/northeast during this current sampling This corresponds to the groundwater gradient direction calculated for prior samplings • MW-1, located in the center of the prior tank cluster, had detecable levels of petroleum hydrocarbons, similar to prior samplings • MW-2, located just south of the prior tank cluster, had low levels of petroleum hydrocarbons This contrasts with prior samplings, in which no petroleum hydrocarbons were detected in this well ANDERSON N , CONSULTING V GROUP