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1 Project Quarterly Update Report February 21, 1992 Southland, 9110 Thornton Road, Stockton, Caldornla Page 6 2 3 GROUNDWATER SAMPLING AND ANALYSES Sampling of the operational groundwater monitoring wells (i e, wells which contained enough water to sample) was performed once during this reporting period on November 26, 1991 This sampling ' event included the newly installed monitoring wells Samples were collected according to Groundwater Technology's SOPs 8, 10, 11, and 12 (Appendix C) Groundwater sampling was ' conducted by first purging water from each well using a PVC bailer Each well was purged of a minimum of four well volumes of water by hand bailing, 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 EPA-approved TeflonO sampler ' Water samples were collected from the routinely sampled domestic wells three times during this reporting period on October 30, November 26, and December, 23 1991 The routinely sampled ' domestic wells are listed in Table 4 All samples were collected In laboratory-supplied containers, labeled, preserved, and stored on Ice Samples were transported under chain-of-custody protocol to a California-certified laboratory, GTEL ' Environmental Laboratories, Inc (GTEL) in Concord, California Each sample was analyzed for BTEX and TPH-as-gasoline using modified EPA Methods 5030/8020/8015 ' None of the samples from the mondonng wells or the domestic wells contained detectable levels of dissolved BTEX or TPHas-gasoline The analytical results for the groundwater samples collected during this quarter are summarized in Tables 5 and 6 Copies of the analytical laboratory reports are included in Appendix D The well name for 1927 was transposed to 9127 on the October 1991 and ' November 1991 laboratory reports The historical laboratory results for samples from the monitoring, pumping, and domestic wells are presented in Appendices E and F 3 0 REMEDIATION SYSTEM Since January 1990, Groundwater Technology has been responsible for operation and maintenance of the groundwater extraction and treatment system The groundwater-extraction system consists of a pumping well designed to depress the groundwater surface and remove separate-phase hydrocarbons (product), and an air stripper designed to treat the petroleum fuel constituents dissolved in the extracted groundwater =&j'GROUNDWATER �! TECHNOLOGY, INC