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Delta yFEB � � <br /> 2005 <br /> EnvironmentalIRONMENTHEALTH <br /> Consuftanft,Inc.Ire. PEF?MITISER <br /> V1C,�5, <br /> Solving eurirenment-related businetis problems )rorldivide wwm deliaeow.com <br /> C <br /> 3164 Gold Camp Drive • Suite 200 <br /> Rancho Cordova, California 95679 USA <br /> 916.638.2085 800.477.7411 <br /> Fax 916.638.8385 <br /> October 30, 2004 <br /> Harlin Knoll <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, Third Quarter 2004 <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 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 third <br /> quarter of 2004. The work was performed in accordance with the field methods and procedures included <br /> 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 July 16, 2004, 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. Field data sheets are presented in Enclosure B. Groundwater <br /> elevation data are presented in Table 1 and inferred groundwater elevation contours are presented on <br /> Figure 2. Depth to groundwater ranged from 49.69 to 50.73 feet below the top of the well casing. Based <br /> on groundwater elevation data computed from depth to water measurements in wells, the groundwater <br /> flow direction across the site was inferred to be south at an approximate gradient of 0.003. <br /> Xinogeft- <br /> EW-,�,immiAl At Ua%e <br /> I <br />�r <br />