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�/. Delta <br /> Environn+ental <br /> Consultants,Inc. <br /> Solving environment-related business problems worldwide www.delfaenv.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 /> March 24, 2005 � CRJED <br /> klAy 0 2 2005 <br /> Mr. Harlin Knoll, R.E.H.S. ENVIRONMENT HEALTH <br /> Senior Registered Environmental Health Specialist PERN"TISERVICES <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, First 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 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 first <br /> quarter of 2005. 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 January 13, 2005, were used to construct a water table elevation contour map included as Figure <br /> 2. Depth measurements were obtained using an electronic water-level indicator and recorded to the <br /> nearest 0.01-foot. The water-level indicator was cleaned with a solution of non-phosphate detergent and <br /> de-ionized water, and rinsed before each use. Groundwater elevation data are presented in Table 2 and <br /> inferred groundwater elevation contours are presented on Figure 2. Depth to groundwater ranged.from <br /> = == <br /> .95 to`49.08 feet below the to of the well casin . Based on <br /> P g groundwater elevation data computed <br /> from depth to water measurements in wells, the groundwater flow direction across the site was inferred <br /> to be to the southeast with an approximate gradient of 0.002. A groundwater flow direction rose diagram <br /> is included as Figure 3. <br /> • <br /> A member of., <br /> Xinogen ental Alliance <br />