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Page B <br /> TPH-D. . . Total Petroleum Hydrocarbons as Diesel <br /> TPH-G . .Total Petroleum Hydrocarbons as Gasoline <br /> BTEX. . Benzene, toluene, ethylbenzene, total xylenes <br /> ppm. Parts per million <br /> ppb. .Parts per billion ( 1 ppm = 1, 000 ppb) <br /> N .D . . .Not detected above method detection limit <br /> Table 4 <br /> Analytical Results of Grab Water Samples Acquired <br /> at 2360 East Street , Tracy, CA <br /> July, 1994 <br /> TPH-D TPH-G B T E X <br /> Sample No. (ppb) (ppb) (ppb) <br /> ----------------------------------------------------------- <br /> EP-5 380 58 ,000 140 150 230 550 <br /> EP-6 N. D. N.D. N.D. N.D. N .D. N .D. <br /> EP-7 N.D. N D N .D. N D. N.D. N .D <br /> ----------------------------------------------------------- <br /> Method <br /> Detection 50 50 0 . 5 0 . 5 0 . 5 0 . 5 <br /> Limit <br /> ----------------------------------------------------------- <br /> TPH-D. . Total Petroleum Hydrocarbons as Diesel <br /> TPH-G. . Total Petroleum Hydrocarbons as Gasoline <br /> BTEX. . .Benzene, toluene, ethylbenzene, total xylenes <br /> ppb. . .Parts per billion <br /> N .D. —Not detected above method detection limit <br /> QUARTERLY COMPLIANCE MONITORING OF THE ON-SITE WELLS <br /> Sampling of the three on-site , 4-inch inside-diameter <br /> groundwater monitoring wells (MW-1, MW-2 , and MW-3) was <br /> performed on December 2 , 1994 with the approval of Mr . <br /> Michael Infurna of San Joaquin County Public Health <br /> Services , Environmental Health Division (PHS/EHD) . <br /> Depth to water and total depth of each of the wells were <br /> measured using an electric tape and the volume of water <br /> within each well casing was computed. Each well was then <br /> purged using a BK Hand Pump until the groundwater was free <br /> 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 />