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' Project Quarterly Update Report--Revision 1 December 30, 1991 <br /> 9110 Thornton Road, Stockton, California Page 12 <br /> None of the samples from the monitoring wells contained detectable levels of dissolved petroleum <br /> hydrocarbons. (A summary of the current laboratory analytical results from groundwater samples is <br />' provided In Appendix C and the laboratory analytical reports are provided in Appendix D.) The historical <br /> laboratory results for samples from the monitoring and pumping wells are tabulated in Appendix E. <br />' None of the domestic wells contained detectable levels of dissolved petroleum hydrocarbons except for <br />' domestic well number 9172. A positive detection was first reported for the August 26 sampling event. In <br /> response to the positive detection, a confirmation sample was collected on September 12. Analysis of <br /> the samples collected during the September 12 event and the following scheduled monthly sampling <br />' event of September 26 confirmed the positive detection. The detected petroleum hydrocarbon <br /> concentrations are summarized as follows: <br />' DATE XYLENES(ppb) TPH-AS-GASOLINE(ppb) <br /> 8/26/91 0.9 31 <br />' 9/12/91 0.7 10 <br /> 9/26/91 7 230 <br /> The reported xylene concentrations did not exceed California state maximum contaminant levels (MCLS) <br />' for drinking water of 1.75 ppm (22 CCR 64444.5). The positive detections were reported to the San <br /> Joaquin County Health Services through written correspondence. <br />' Domestic Well number 9172 is located on the Ivy Motel property, which reportedly hada petroleum <br /> underground storage tank on site. The Ivy Motel is located cross gradient of the Southland site. <br /> Appendix C and D contain the current analytical results summary and laboratory reports respectively.) <br />' The historical laboratory results for samples from the domestic wells are tabulated in Appendix F. <br />' REMEDIATION SYSTEMS <br /> Since January 1990, Groundwater Technology, Inc. has been responsible for operation and maintenance <br />' of the groundwater-extraction and treatment system only. The groundwater-extraction system consisted <br /> of a pumping well designed to depress the water table and remove separate-phase hydrocarbons <br />' (product), and an air stripper designed to treat the dissolved constituents in the extracted groundwater. <br /> �_]_I GROUNDWATER <br /> L-� �fjTECHNOLOGY, INC. <br />