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Delta <br /> �/. �n�ironmental <br /> ., Consultants,Inc. <br /> Solving environment-related business problems worldwide www.dettaenv.com <br /> 3164 Gold Camp Drive • Suite 200 <br /> EEG <br /> Rancho Cordova, California 95670 USA 1 70 <br /> 916.638.2085 800.477.7411 � <br /> Fax 916.638.8385 R��MEN 0�'ES <br /> January 6, 2005 ISE <br /> Mr. Harlin Knoll,R.E.H.S. <br /> Senior Registered Environmental Health Specialist <br /> San Joaquin County Environmental Health Department <br /> 304 E. Weber Avenue,Third Floor <br /> Stockton, California 95202-2708 <br /> Subject: Quarterly Groundwater Monitoring Results Report, Fourth Quarter 2004 <br /> Tesoro Station#67080 <br /> 2448 Kettleman Road <br /> Lodi, California <br /> Delta Project No. D003-007-1 <br /> Dear Mr. McHugh: <br /> Delta Environmental Consultants, Inc. (Delta) has been authorized by Tesoro Petroleum Company <br /> (Tesoro) to perform quarterly groundwater monitoring at the site located at 2448 Kettleman Road, Lodi, <br /> California(Figure 1). <br /> The locations of former and current site features are illustrated on Figure 2. 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 fourth <br /> quarter of 2004. Well construction details for the three current 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 MW-1, MW-2, and MW-3. The measurements <br /> taken on October 12, 2004, were used to construct a water table elevation contour map included as <br /> Figure 2. Depth measurements were obtained using an electronic water-level indicator and recorded to <br /> the nearest 0.01-foot. The water-level indicator was cleaned with a solution of non-phosphate detergent <br /> and de-ionized water, and rinsed before each use. Groundwater elevation data are presented in Table 2 <br /> and inferred groundwater elevation contours are presented on Figure 2. Depth to groundwater ranged <br /> from 50.23 to 50.98 feet below the top of the well casing. Based on groundwater elevation data <br /> corriputed-from depth to water measurements in wells, the groundwater flow direction across the site was <br /> inferred to be to the southwest with an approximate gradient of 0.018, <br /> A member of. <br /> Xinogen. <br /> FmuoomenW Allis <br />