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1 1- <br /> A Delta <br /> t <br /> Environmentalal <br /> Consultants, Inc. <br /> 3330 Data Drive,Suite 100 <br /> Rancho Cordova,CA 95670 <br /> 916/638-2085 f <br /> FAX:9161638-8385 <br /> November 28, 1990 <br /> Mr. Harlin Knoll,REHS <br /> Environmental Health Division <br /> Public Health Services <br /> San Joaquin County <br /> Post Office Box 2009 <br /> Stockton,California 95201 <br /> Subject: Preliminary Report and Tank Closure Report <br /> Shell Service Station <br /> w 3725 Tracy Boulevard,Tracy,California <br /> Shell WIC No.204-7884-0901 <br /> Delta Project No.40-89-012 <br /> Dear Mr.Knoll: <br /> Enclosed is the report titled Preliminary Report and Tank Closure Report for the subject site,prepared <br /> by Delta Environmental Consultants,Inc. (Delta). <br /> Approximately 400 cubic yards of soil containing petroleum hydrocarbons have been excavated at the <br /> subject site and transported to disposal facilities. The soil has been removed from the former and new <br /> product storage tank locations and from the former pump island locations. Soil containing petroleum <br /> constituents beneath the site to a depth of anproximately 9 feet,has been removed. However,petroleum <br /> constituents have been identified in soil at the water table, approximately 10 feet below the surface. <br /> Concentrations of total petroleum hydrocarbons (TPH)in 12 soil samples ranged from 0.09 to 140.0 <br /> parts per million. <br /> Eight of the 12 samples collected at the water table contained TPH as gasoline and 4 contained'FPH <br /> as Stoddard solvent or light petroleum distillate. The Stoddard solvent concentrations may be the result <br /> of an upgradient activity. <br /> Concentrations of petroleum constituents in ground water samples collected during two sampling events <br /> were below laboratory analytical method detection limits. We propose to monitor ground water for <br /> petroleum constituents during November 1990 and February, May, and August 1991. If petroleum <br /> constituents are not detected in ground water, monitoring should be discontinued and the site closed. <br /> Practical Solutions to Environmental Concerns <br />