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Project Quarterly Update Report July 30, 1991 <br /> / 9110 Thornton Road, Stockton, California Page 12 <br />' C None of the samples from the monitoring and pumping wells contained detectable levels of <br /> dissolved petroleum hydrocarbons (A summary of the current laboratory analytical results from <br /> groundwater samples is provided in Appendix C and the laboratory analytical reports are provided in <br /> Appendix D ) A map showing the locations of the sampled wells and their respective Not Detected <br /> (ND) concentration is presented as Figure 7 The historical laboratory results for samples from the <br /> monitoring and pumping wells are tabulated in Appendix E <br /> I [ The results of laboratory analysis results on groundwater samples collected from the domestic <br /> wells were ND for all parameters (See Appendix C and D for current analytical results summary <br /> and laboratory reports respectively ) The historical laboratory results for samples from the <br /> domestic wells are tabulated Appendix F <br /> ` REMEDIATION SYSTEMS <br /> l � <br /> L Since January 1990, Groundwater Technology, Inc has been responsible for the groundwater- <br /> extraction and treatment system only The groundwater-extraction system consisted of a pumping <br /> [ well designed to depress the water table and remove separate-phase hydrocarbons (product), and <br /> I an air stripper designed to treat the dissolved constituents in the extracted groundwater <br /> / r <br /> l GROUNDWATER REMEDIATION SYSTEM <br /> The groundwater treatment system experienced a mechanical breakdown last quarter as reported in <br /> ( the last project Quarterly Update Report The system has not been reactivated at Southland's <br /> request due to the recent analytical results, which reported (1) no detectable TPH-as-gasoline levels <br /> r in the samples from any of the monitoring wells, pumping wells, or nearby domestic wells for the <br /> ILS period of January - March 1991, and (2) no detectable petroleum hydrocarbon constituents for the <br /> E I same wells for the period of April - June 1991 <br /> ❑o c <br /> coo FE <br /> t <br /> K Southland has submitted correspondence to the San Joaquin County Department of Health to place <br /> No <br /> I the groundwater treatment system ,n dormant status, with reactivation criteria based on changes in <br /> l water quality data <br /> I [ <br /> GROUNDWATER <br /> Tl lE ; L., �t- TECHNOLOGY, INC <br /> I STOC I`( <br />