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Project Quarterly Update Report May 11, 1992 <br /> Southland. 9110 Thornton Road, Stockton, Caldomia 4 <br /> then allowed to recover to at least 80 percent of the original static water level before sampling The <br /> groundwater samples were collected using an Ernrnronmental Protection Agency (EPA)-approved <br /> I Teflone sampler well-water bailer was lost down monitoring well MW-9 on March 30, 1992, <br /> F rename ng the well unsaniplable ) <br /> IWater samples were collected from the routinely sampled domestic wells three times during this <br /> reporting period, on January 30, February 24, and March 30, 1992 The routinely sampled domestic <br /> wells are listed in Table 3 <br /> All samples were collected in laboratory-supplied containers, preserved, labeled, and stored on ice <br /> Samples were transported under chain-of-custody protocol to a California-certified laboratory, GTEL <br />' Environmental Laboratories, Inc (GTEL) in Concord, California Each sample was analyzed for <br /> BTEX and TPH-as-gasoline using modified EPA Methods 5030/8020/8015 <br /> All of the samples from the monitoring wells and the domestic wells contained nondetectable <br /> concentrations of dissolved BTEX and TPH-as-gasoline, except one sample from monitoring well <br /> MW-1, as described above The analytical results for the groundwater samples collected during this <br /> quarter are summarized In Tables 4 and 5 Copies of the analytical laboratory reports are included <br />' in Appendix B The historical laboratory results for samples from the monitoring, pumping, and <br /> domestic wells are presented in Appendices C and D <br /> 3 0 REMEDIATION SYSTEM <br /> The groundwater extraction and treatment system at the site consists of a pumping well designed to <br /> depress the groundwater surface and remove separate-phase hydrocarbons and an air stripper <br /> designed to remove the petroleum fuel constituents dissolved to the extracted groundwater <br /> The groundwater extraction and treatment system had a mechanical breakdown in October 1990 as <br /> reported in the January 1991 Proiect Quarterly Ugdate Report At Southland's request, the system <br /> has not been reactivated because of the recent analytical results <br /> y I <br /> � -'GROUNDWATER <br /> TECHNOLOGY, INC <br />