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' Project Quarterly Update Report July 30, 1991 <br /> 9110 Thornton Road, Stockton, California Page 14 <br /> SUMMARY <br />' Groundwater monitoring data has documented a decrease in the water table elevation of <br /> approximately 0 2-0 3 feet during this reporting period The average depth to water in June,1991 <br />' was approximately 35-feet below mean sea level 1ms11, compared to a depth of approximately 20- <br /> feet below msl in June 1986 The groundwater flow direction remained in an easterly direction at <br />' the average gradient of approximately 0 002 during the three month period <br /> On May 27, 1991, a total of eleven monitoring and extraction wells were sampled and analyzed for <br />' the presence of BTEX and TPH-as-gasoline concentrations Analytical results reported no <br /> detectable concentrations for any constituents in any of the samples <br /> I <br /> A select group of nearby domestic wells were sampled three times during the quarter and analyzed <br /> Ifor the presence of BTEX and TPH-as-gasoline concentrations All analytical results for the samples <br /> from the domestic wells reported non-detectable levels for all parameters analyzed <br /> A review of the laboratory analytical results collected to date shows that decreases in the <br /> concentrations of BTEX and TPH-as-gasoiine have occurred over the duration of the project to the <br />' current non-detectable levels It is apparent that the combined efforts of separate-phase product <br /> removal, groundwater extraction, the declining water table and in situ sal venting have proven <br /> Ieffective in removing the gasoline hydrocarbon constituents from the groundwater over the life of <br /> the project <br /> The groundwater extraction and treatment system was not operated during this quarter, due to the <br /> low & to non-detectable concentrations of petroleum hydrocarbons in the groundwater over the <br /> last six months <br /> ICLOSURE <br /> IGroundwater Technology, Inc 4s pleased to provide Southland Corporation with this Project <br /> Quarterly Update Report If you have any questions or need additional information regarding this <br /> site, contact Groundwater Technology's office at 14151 671-2387 <br /> i <br /> _JL� GROUNDWATER <br /> TECHNOLOGY, INC <br /> I <br />