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+f RECEIVED <br /> FEB 2 4 1#9a <br /> • F-NVIRONMENTAL HCA&TH <br /> PERMITi69RVICfS <br /> AEGIS ENVIRONMENTAL , INC . <br /> 1050 Melody Lane, Suite 160, Roseville, CA 95678 ♦ 916.782-2110 1916-969-2110 1 FAX 916.786-7830 <br /> February 17, 1993 <br /> Mr Harlan Knoll <br /> Environmental Health Specialist <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 1601 East Hazelton Avenue <br /> Stockton, California 95201 <br /> Subject Site Status <br /> Exxon Site RAS #7-1050 <br /> 909 Hammer Lane, Stockton, California <br /> Dear Mr Knoll <br /> Aegis Environmental, Inc (Aegis), has prepared this letter to document our recent <br /> telephone conversation and the status of the subject site <br /> BACKGROUND <br /> The site, a former Exxon Company, U S A (Exxon), service station, is currently vacant <br /> and no structures remain The underground storage tanks and piping were removed in <br /> 1986 and 1990, respectively Petroleum hydrocarbons were noted in soil samples <br /> collected from excavation and soil boring activities at the site since 1986, and vapor <br /> samples collected during 1987 and 1990 soil gas surveys A soil vapor extraction system <br /> was operated on the site from March through December 1991 An estimated 1,439 <br /> pounds of petroleum hydrocarbons and 60 pounds of benzene were removed from the <br /> subsurface <br /> Groundwater has dropped from a depth of approximately 47 feet in 1987 to approximately <br /> 60 feet below surface in September 1992 Five groundwater monitoring wells (MW-1 <br /> through MW-5) were drilled in 1986 and 1987 In 1990, wells MW-6, MW-7, and MW-8 <br /> were drilled in the vicinity of wells MW-3, MW-4, and MW-5, respectively, because the <br /> latter went dry The wells have been sampled periodically since 1986 None of the <br /> groundwater samples from the wells has contained detectable petroleum hydrocarbon <br /> concentrations since 1991 <br /> 93 005A LTR <br /> GEOLOGISTS - ENGINEERS - GROUNDWATER SCIENTISTS L`�� <br />