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1 <br />' Project Chrarterly Update Report May 1, 1991 <br /> 9110 Thornton Road, Stockton, California Page 11 <br /> A map depicting the distribution of dissolved hydrocarbons in the groundwater, based on the laboratory <br />' results for the monitonng well samples collected February 21, 1991, is presented as Figure 6 <br />' None of the samples from the monitoring wells and pumping wells contained detectable levels of <br /> dissolved total-petroleum hydrocarbons However, the samples from monitoring wells MW-15A and <br />' MW-17B contained detectable toluene ooncentratrons of 0 5 parts per billion (ppb) and 0 4 ppb, <br /> respectively All other samples analyzed contained no detectable levels of BTEX compounds Historical <br /> results of past laboratory data for the monitoring and pumping wells are tabulated In Appendix E <br /> The results of laboratory analyses of groundwater samples collected from the domestic wells <br /> Isurrounding the site Indicate that none of the wells contained detectable levels of dissolved <br /> hydrocarbons during any of the sampling rounds conducted during this reporting period Historical <br /> results of past laboratory data for the samples from the domestic wells are tabulated Appendix F <br /> lie REMEDIATION SYSTEMS <br /> Since January 1990, Groundwater Technology, Inc has been responsible for the operating of the <br /> groundwater-extraction and treatment system only The groundwater-extraction system consists of a <br /> pumping well designed to depress the water table and remove separate-phase hydrocarbons (product), <br /> and an air stripper designed to treat the dissolved constituents In the extracted groundwater. <br /> IGROUNDWATER REMEDIATION SYSTEM <br /> During this three-month reporting period,the groundwater treatment system was not operational as a <br /> result of mechanical breakdown The system can be brought back to operational status pending <br /> notification from Southland However, due to the current analytical results, which reported no detectable <br /> TPH-as-gasoline levels in the samples from any of the monitoring wells, pumping wells, or nearby <br /> domestic wells, continued groundwater treatment at the site may not be warranted <br /> I <br /> Currently, Southland has submitted correspondence to the San Joaquin County Department of Health to <br /> I place the groundwater treatment system In dormant status, with reactivation criteria based on changes in <br /> water quality data. <br /> 1�4 GROUNDWATER <br /> TECHNOLOGY,INC <br />