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1 IN I RODLJC i ION <br /> Foniici I~xxon Retail Site(RS) 7-3708 is an active U S A PetrolC1.1111 station located at 2705 Country <br /> C lub Bouletiald ni Stockton, California, at the northwest corner of the intd.isection of Ryde Avenue <br /> and Country Club Bould.,�aid I levation of the ground surface at the site is approxnnately I to ? feet <br /> abo,c mean sea lcvel The site slopes down toward the northeast and southwest corners from -I <br /> Slight topogiaphic high across the center <br /> Ihere are two undergiound storage tanks at the site containing diesel fuel and unleaded gasoluie <br /> Groundwater monitoring has been conducted at the site since 1991 <br /> 2 GROLJNDWAJ ER MONITORING <br /> On 17 May 2000, wells MW and MW4-MW10 were gauged for depth to water and for liquid-phase <br />' hydrocarbon,, (LPH) with an optical interface probe Groundwater samples were collected from thd, <br /> wells and the sample,, %titre analyzed for Total Petroleum Hydrocarbons as gasoline (TPH-g), for <br /> benzene, toluene, ethylbenzene, and total xylcncs (BTEX), and for methyl t-butyl ether (MTBF) <br /> Fhc current depth-to-"ater measurements and calculated groundwater elevation,, are prescntcd in <br /> boldface type in Tablc 1, along with previous data, and current groundwater elevation,, arc shown <br />' in Figure I I he groundwater flow direction on 17 May was to the southeast, with a gradient of <br /> approximately 0 001 LPII was not observed in any of the wells <br /> After the depths to water were measured, the wells were purged Field parameters of pH, <br /> temperature, and elects ical conductance of the purged water wcrc measured for approximately every <br /> %C11 casing volume during purging Field documents are included in Appendix A When the field <br />' parameter,, were stable (less than a 10 percent change from the prcviotis reading for temperature and <br /> clectncal conductance and not more than 0 1 pl I units) and approximately 3 casing volumes were <br /> removed from each well, purging was stopped and samples were collected, using factory-cleaned <br /> Idisposable bailers The samples were poured into 40-m1 glass VOA vials and stored in an ice-filled <br /> cooler A laboratory-prepared trip blank was stored and transported in the cooler with the samples <br />' All samples were handled and transported under chain of custody <br /> The samples were submitted to SPL, Inc in Houston, Texas, and were analyzed for TPH-g by Cal <br />' EPA-modified EPA Method 8015 and for BTEX and MTBE by EPA Method 8021B "Che results <br /> are presented in boldface type, along with previous analytical data, in Table 1, and are shown in <br /> Figure 1 The laboratory analytical report and chain-of-custody documentation are included in <br />' Appendix B <br /> 3. WORK PROPOSED FOR NEXT QUARTER <br />' Groundwater will be gauged and sampled in August 2000 Groundwater samples will be analyzed <br /> for TPH-g, BTEX, and MTBE <br />' F�Fro3ecis1737os\m.,rlwm5w rz_3706 doe 1 <br />