Laserfiche WebLink
Between each well volume purge, conductivity, pH, and water temperature readings were <br /> obtained and noted on the Groundwater Sampling Information Sheet (see Appendix A). Once the <br /> stabilization of the readings were noted, the sample was collected from the well Purge water <br /> 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) by EPA Methods 8015 and 8020 <br /> respectively The analytical results of the groundwater samples revealed the following (see <br /> Table 2); <br /> Table 2. Groundwater Analytical Results <br /> Well <br /> • Number Date TPHG Benzene Toluene Ethyl Benzene Xylene <br /> MW_ 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 /> 9/14/95 28,000 240 31 130 160 <br /> 12/26/95 35,800 8000 2100 9000 1800 <br /> mw-2 12/06/94a X200 NO NO NO NO <br /> (50 52) 4/3/95 NO NO ND NO NO <br /> 6/16/95 NO NO ND NO NO <br /> 9/14/95 NO NO ND NO NO <br /> 12/26/95 NO NO ND NO NO <br /> MW-3 12/09/94a X200 NO NO NO NO <br /> (49 78) 4/3/95 NO NO NO ND NO <br /> 6/16/95 ND NO ND NO NO <br /> 9/14/95 NO NO ND ND NO <br /> 12/26/95 NO NO ND NO NO <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,EthyFBenzene,Xylene results in ug/L parts per billion(ppb) <br /> a)Samples not analyzed at RWQCB detection limn for this monitoring episode <br /> I <br /> i <br /> I <br />