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I <br /> Quarterly Project Update Report January 29, 1993 <br /> Southland Store No 20680, 9110 Thornton Road, Stockton, CA 4 <br /> ppb was detected by laboratory analyses in the groundwater sample collected from domestic well <br /> 9156 on October 29, 1992 Laboratory results of groundwater samples collected from each of the <br /> Iother domestic wells during the reporting period did not report TPH-G concentrations The <br /> analytical results of groundwater samples collected during this quarter are summarized in Tables 3 <br /> I and 5 Copies of the analytical laboratory reports are included in Appendix B The historical TPH-G <br /> laboratory results for groundwater samples collected from the monitoring, pumping, and domestic <br /> Iwells 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 /> Idepress the groundwater surface and remove separate-phase hydrocarbons and an air stripper <br /> designed to remove the petroleum fuel constituents dissolved in the extracted groundwater <br /> The groundwater extraction and treatment system experienced a mechanical breakdown in October <br /> 1990 as reported in the January 1991 Project Quarterly Update Report At Southland's request, the <br /> system has not been reactivated because of the following analytical results <br /> I ■ No detectable TPH-G concentrations in the groundwater samples collected from the <br /> monitoring, pumping, or nearby domestic wells between January 1991 and March <br /> 1992, except monitoring well MW-1 and domestic well No 9172, <br /> ■ No detectable BTEX concentrations in groundwater samples collected from <br /> monitoring, pumping, or nearby domestic wells between April 1991 and March 1992, <br /> I except domestic well 9172 during August and September 1991 and April 1992, and <br /> monitoring well MW-1 in March 1992 <br /> ISouthland has requested the San Joaquin County Department of Health to place the groundwater <br /> treatment system in dormant status with reactivation criteria based on changes in water quality data <br /> This concludes Groundwater Technology's Project Quarterly Ugdate Re rt for the Southland site at <br /> 9110 Thornton Road In Stockton, California If you have any questions or need additional <br /> information regarding this site, please contact our Concord office at (510) 671-2387 <br /> i <br /> R12yynz RH <br /> ���J,GROUNDWATER <br /> L IF T]'TECHNOLOGY, INC <br /> I <br />