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I/RDelta = AUG 1 6 2004 & Environmental Consultants;Inc. ENVIRONMENT HEALTH Solving environment-reated business,probms worwde PERMIT/SER\AM-de1taenv.com ltaenv.com 3164 Gold Camp Drive • Suite 200 Rancho Cordova, California 95670 USA 916:638.2085 800.477.74I1 Fax 916.638.8385 _ August 13,2004 Mr. Harlin Knoll,R.E.H.S. j Senior Registered Environmental Health Specialist San Joaquin County Environmental Health Department 304 E. Weber Avenue,Third Floor Stockton,California 95202-2708 Subject: Quarterly Groundwater Monitoring Results Report, Second Quarter 2004 Tesoro Site No. 67080 2448 Kettleman Road Lodi, California- Delta Project No.D003-007-1 Dear Mr. Knoll: Delta,Environmental Consultants, Inc. (Delta) has been orized by Tesoro Environmental Resources Company (Tesoro) to perform quarterly groundwater monitofing at the site located at 2448 Kettleman Road, Lodi, California(Figure 1). Tesoro sold the site to USA Petroleum,but retains responsibility for releases prior to the sale. The locations of former and current site features are illustrated on Figure 2. Quarterly groundwater monitoring _ is intended to evaluate the distribution-of petroleum hydrocarbon constituents in groundwater beneath the site. This report summarizes results of the samples collected from the site during the second quarter of 2004. The work was performed in accordance with the field methods and procedures included in Enclosure A. Groundwater Level Measurements _ On May 10, 2004,Doulos Environmental (Doulos)measured epth to groundwater in monitoring wells MW-1, MW-2, and MW-3. The Doulos field data sheets are presented in Enclosure B. The measurements were used - to construct a water table elevation contour map included a Figure 2. Depth measurements were obtained using an electronic water-level indicator and recorded-to the nearest 0.01-foot. The water-level indicator was cleaned with a solution of nonphosphate detergent and deio ized water, and rinsed before use at each well. Groundwater elevation data are preserited in Table 1 and inferred groundwater elevation contours are presented on Figure 2. Depth to groundwater ranged from 46.90 to 48 01 feet below the top of well casing. Based on ground water elevation data computed from depth to water measurements in wells, the groundwater flow direction across the site was.inferred to be south-southeast wit an approximate gradient of 0.002. Groundwater Sam lin and Anal tical Results Groundwater monitoring wells MW-f through MW-3 were simpled on May 10, 2004. The methods used to collect the samples are presented in-Enclosure A. Samples from these wells were analyzed for total petroleum hydrocarbons (TPH) in the gasoline range, benzene, toluene ethylbenzene, xylenes (BTEX), methyl tertiary butyl ether (MTBE), tertiary amyl methyl ether (TAME), tertiary butyl alcohol (TBA);' disopropyl ether A member of.. - InogeAe