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. was stored on-site In drums pending analytical results The well sampling Information sheet <br /> containing data on temperature, conductivity, pH, depth to water, and well volumes purged can <br /> be found In Appendix A <br /> Once the well recovers to about 80% of the Initial water level measurement, a new disposable <br /> bailer was used to obtain the groundwater sample which was placed Into the appropriate, <br /> laboratory prepared sample containers leaving no headspace, and immediately placed on Ice for <br /> shipment to Priority Environmental Labs in Milpitas, California (a State Certified Testing Lab) <br /> under proper chain-of-custody documentation The chain-of-custody and the Laboratory <br /> Analysis Results can be found In Appendix B <br /> LABORATORY FINDINGS <br /> Three groundwater samples were analyzed for Total Petroleum Hydrocarbons as Gasoline <br /> (TPHG) and Benzene, Toluene, Ethylbenzene and Xylene (BTEX) using EPA Methods 8015 and <br /> 8020 respectively The analytical results of the groundwater samples revealed the following <br /> (see Table 2), <br /> Table 2 Groundwater Analytical Results <br /> Well <br /> Number Date TPHG Benzene Toluene Ethyl Benzene Xylene <br /> • M W- 1 12/05/94a 48,000 2100 510 1900 3000 <br /> (49 40) 4/3/95 82,000 380 150 310 620 <br /> 6/16/95 46,000 160 130 110 200 <br /> MW-2 12/06/94a <200 ND ND ND ND <br /> (50 52) 4/3/95 ND ND ND ND ND <br /> 6/16/95 ND ND ND ND ND <br /> MW- 3 1 2/09/94a <200 ND ND ND ND <br /> (49 78) 4/3/95 ND ND ND ND ND <br /> 6/16/95 ND ND ND ND ND <br /> Depth to water measured in feet below top of PVC casing NC-Not Calculated <br /> Groundwater elevation measured in feet above Mean Sea Level ND-Not Detected <br /> Groundwater elevation equals surveyed top of PVC casing elevation minus depth to water <br /> (49 40) Surveyed elevation of the top of PVC casing <br /> TPHG-Total petroleum hydrocarbons as gasoline results in ug/L parts per billion(ppb) <br /> BTEX-Benzene,Toluene,Ethyl-Benzene,Xylene results in ug/L parts per billion(ppb) <br /> a) Samples not analyzed at RWQCB detection limit for this monitoring episode <br /> GROUNDWATER CONTOUR MAP AND GRADIENT <br /> A groundwater contour map was prepared for June 16, 1995 from the data listed In Table 1 <br /> (see Figure 1) Groundwater elevation contours were plotted from the measurements and <br />• plotted to a known datum The groundwater flow was In a northerly direction under a calculated <br /> gradient of 0 004 <br />