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' Project Quarterly Update Report--Revislon 1 December 30, 1991 <br /> 9110 Thornton Road, Stockton, California Page 14 <br /> A review of the laboratory analytical results collected to date shows that decreases In the concentrations <br />' of BTEX and TPH-as-gasoline have occurred over the duration of the project to the current non- <br /> detectable levels in all monitoring and domestic wells except domestic well 9172. It is apparent that the <br />' combined efforts of separate-phase product removal, groundwater extraction, the declining water table <br /> and in situ soil venting have proven effective in removing the gasoline hydrocarbon constituents from the <br />' groundwater over the life of the project. <br /> The groundwater extraction and treatment system was not operated during this quarter, because of the <br />' low &to non-detectable concentrations of petroleum hydrocarbons in the groundwater over the last nine <br /> months. <br /> 1 <br /> CLOSURE <br />' Groundwater Technology, Inc. Is pleased to provide Southland Corporation with this Project Quarterly <br /> Update Report. If you have any questions or need additional information regarding this site, contact <br /> Groundwater Technology's office at (510) 671-2387. <br /> 1 <br /> 1 <br /> LJ GROUNDWATER <br /> TECHNOLOGY,INC. <br /> 1 <br />