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' Project Quarterly Update Report July 28, 1992 Southland, 9110 Thornton Road, Stockton, Califomia 3 During this reporting period, no petroleum odors or separate-phase hydrocarbons were detected in any of the monitoring wells or pumping wells ' 2.2 Groundwater Sampling and Analyses ' Sampling of the operational groundwater monitoring wells (i e , wells which contained enough water to sample) was performed on June 29, 1992 Analyses of the samples collected on June 29, 1992, ' verified that benzene, toluene, ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons (TPH)-as-gasoline concentrations were below detection limits, except for the samples collected from ' monitoring well MW-1 and MW-18 The TPH-as-gasoline concentrations reported for samples from wells MW-1 and MW-18 were 48 parts per billion (ppb) and 19 ppb, respectively Samples were ' collected according to Groundwater Technology's standard operating procedures (Appendix A) Groundwater sampling was conducted by first purging water from each well using a polyvinyl chloride (PVC) bailer Each well was purged of a minimum of four well volumes of water by hand ' balling, unless the wells could be purged dry The groundwater was then allowed to recover to at least 80 percent of the original static water level before sampling The groundwater samples were collected using an Environmental Protection Agency (EPA)-approved Teflon® sampler A well-water bailer was lost down monitoring well MW-9 on March 30, 1992, rendering the well unsamplable A second attempt to remove the baller was unsuccessful on June 29, 1992 Another attempt will be made on July 31, 1992 ' Water samples were collected from the routinely sampled domestic wells three times during this reporting period, on April 21, May 28, and June 29, 1992 The routinely sampled domestic wells are ' listed In Table 3 ' All samples were collected in laboratory-supplied containers, preserved, labeled, and stored on ice Samples were transported under chain-of-custody protocol to a Cal€fomla-certified laboratory, GTEL ' Environmental Laboratories, Inc (GTEL) in Concord, Califomia Each sample was analyzed for BTEX and TPH-as-gasdine using modified EPA Methods 5030/8020/8015 ' The analytical results showed detectable concentrations of toluene, xylenes and TPH-as-gasoline NgL only In the water sample collected from domestic well 9172 {Ivy Motel) on April 21, 1992 The LAMA 1 ' analytical results reported a TPH-as-gasoline of 21 ppb Analytical results for the other samples collected from the domestic wells showed no concentrations of dissolved BTEX and TPH-as-gasoline PA GROUNDWATER __ ;TECHNOLOGY, INC