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{ !aq • 2 <br /> r� <br /> Michael Infurna of the Environmental Health Division of the <br /> San Joaquin County Public Health Services Department <br /> (PHS/EHD) . <br /> Depth to water and total well depth in each of the wells <br /> were measured using an electric tape and the volume of <br /> water within each well casing was computed. Each well was <br /> then purged with a BK Hand Pump until the groundwater was <br /> free of significant sand, silt , and/or other grit , and <br /> temperature, pH, and electrical conductivity readings <br /> stabilized. In this case, over three well volumes of water <br /> were removed from each well . Measurements acquired <br /> attendant to sampling appear on the well monitoring forms <br /> enclosed in Appendix A. <br /> Subsequent to the purging of each well , a groundwater <br /> sample was collected from the discharge line of the and <br /> pump (a length of clean polyethylene tubing) . Each sample <br /> was transferred into one-liter amber glass sample bottles <br /> and two Volatile Organic Analysis (VOA) vials . Each sample <br /> container was promptly fitted with a teflon-lined screw <br /> cap, labeled, placed on ice, and transported under chain of <br /> custody to Priority Environmental Labs of Milpitas , a <br /> Californias-state certified hazardous waste analytical <br /> laboratory. Analyses were subsequently performed on all <br /> samples for Total Petroleum Hydrocarbons as Diesel (TPH-D) <br /> using EPA Methods 3510/8015, Total Petroleum Hydrocarbons <br /> as Gasoline (TPH-G) , and benzene, toluene, ethylbenzene, <br /> and total xylenes (BTEX) using EPA Methods 5030/8015-8020 <br /> ( 602) . The samples acquired from wells MW-1 and MW-2 were <br /> also analyzed for Oil and Grease (TOG) using SM 5520 C&F. <br /> Copies of the results of certified analyses as received <br /> from the certified are enclosed within Appendix A. These <br /> results are summarized and compared with previous sampling <br /> results in the following table: <br /> Table 1 <br /> Analytical Results of Groundwater Samples Acquired <br /> from Monitoring Wells MW-1 , MW-2 , and MW-3 at <br /> 275 Grant Line Road, Tracy, CA <br /> Sample Date <br /> & Depth to TPH-D TPH-G B T E X TOG <br /> Water ( ft) (ppb) (ppb) (ppb) (ppm) <br /> ------------------------------------------------------------ <br /> MW-1 <br /> 02/05/93 N.D. N.D. N .D. N.D. N.D. N.D. N .D . <br /> 7 . 97 ' <br />