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Delta <br /> /., Environmental - 7 - - <br /> Consultants,Inc. <br /> Solving environment-related business problems worldwide www.deltaenv.com <br /> 3164 Gold Camp Drive • Suite 200 <br /> Rancho Cordova, California 95670 USA <br /> 916.638.2085 800.477.7411 <br /> Fax 916.638.8385 - <br /> December 5, 2005 <br /> 2005 <br /> Mr.-Harlin Knoll ENVI, ;�f�i:'E'�[ 1��) <br /> San Joaquin County Environmental Health Department PER'9'V"V ENT H��SfH <br /> 304 E. Weber Avenue, Third Floor <br /> Stockton, California 95202-2708 - <br /> Subject: Quarterly Groundwater Monitoring Result Report, Third Quarter 2005 <br /> Tesoro Station#67080 <br /> 2448 Kettleman Road <br /> Lodi, California <br /> Delta Project No. D003-007-1 <br /> Dear Mr. Knoll: <br /> Delta Environmental Consultants, Inc. (Delta) has been authorized by Tesoro Petroleum Company <br /> (Tesoro)to perform quarterly groundwater monitoring at tie site located at 2448 Kettleman_ Road, Lodi, <br /> California(Figure 1). - <br /> The locations of former and current site features are illustrated on Figure 1. Quarterly groundwater <br /> monitoring is intended to evaluate the distribution of petroleum hydrocarbon constituents in groundwater <br /> beneath the site. This report summarizes results of the samples collected from the site during the third <br /> quarter of 2005. Well construction details for the three c rrent groundwater monitoring wells (MW-1, <br /> MW-2 and MW-3) are included in Table 1. The work was performed in accordance with the field <br /> methods and procedures included in Enclosure A. <br /> Groundwater Level'Measurements <br /> Depth to groundwater was measured in monitoring wells W-1, MW72, and MW-3. The measurements <br /> taken on July 13, 2005, were used to construct a water table elevation contour map included as Figure 3. <br /> Depth measurements were obtained using an electronic water-level indicator and recorded to the nearest. <br /> 0.01-foot: :The water-level indicator was cleaned with a solution of non-phosphate detergent.and de- <br /> ionized water, and rinsed before each use. Groundwater elevation data.are presented in-.Table`l and: <br /> inferred .groundwater elevation contours.are presented on igure D.='Depth to groundwater ranged from <br /> 47.56 to 49.66 feet below the top of the well casing. Ba sed on groundwater elevation data computed <br /> from depth to water measurements in wells, the groundwa lerflow direction across the site was inferred <br /> to be to the northwest with an approximate.gradient of .03. A site rnap.showing groundwater flow <br /> direction is included as'F'igure 3. <br /> .: A member of.. - - <br /> Inogeif <br />