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� r <br /> Delta <br /> �/. Environmental 't��' =�1f <br /> • Consultants,Inc. C C 1� <br /> Solving environment-related business problems worldwide FEB " 1 2060' www.dettaenv.com <br /> 3164 Gold Camp Drive • Suite 200 <br /> Rancho Cordova, California 95670 USA ENV1R0'1`,1N'T:\71 HEALTH <br /> 916.638,2085 800.477.74II PERIWUSERVICES <br /> Fax 9I6.638.8385 <br /> February 2, 2006 <br /> Mr. Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> 304 E. Weber Avenue, Fourth Floor <br /> Stockton, California 95202-2708 <br /> Subject: Quarterly Groundwater Monitoring Results Report, Fourth 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 fourth <br /> quarter of 2005. 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. Depth <br /> measurements were obtained using an electronic water-level indicator and recorded to the nearest 0.01- <br /> foot. The water-level indicator was cleaned with a solution of non-phosphate detergent and de-ionized <br /> water, and rinsed before each use. The groundwater elevation data are presented in Table 1 and the field <br /> data sheets are included as Enclosure B. Depth to groundwater ranged from 49.06 to 50.15 feet below <br /> the top of the well casing. The measurements taken on October 6, 2005, were used to construct a water <br /> table elevation contour map included as Figure 3. Based on the inferred contours, the groundwater flow <br /> direction across the site was to the southwest with an approximate gradient of 0.002_ <br /> Groundwater Samoling and Analytical Results <br /> Groundwater monitoring wells MW-1 through MW-3 were sampled on October 6, 2005. The methods <br /> used to collect the samples are presented in Enclosure A. Samples from these wells were analyzed for <br /> total petroleum hydrocarbons in the gasoline range (TPHg), benzene, toluene, ethylbenzene, xylenes <br /> (BTEX), methyl tertiary butyl ether (MTBE), tertiary amyl methyl ether (TAME),,tertiary butyl alcohol <br /> A member of <br /> XInogenmenu,All ,ce <br />