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d engineers inc McClellan g , e 2140 Eastman Avenue,Ventura,California 93003, Tel.(805)644-5535,Telex:659241 EN F`ERtM1 f5E�v1C�"S March 9, 1988 Project No. 0588-1603 Ogden Environmental Services, Inc. 10955 John Jay Hopkins Drive San Diego, CA 92121 Attention: William S. Rickman Groundwater Assessment Plan Ogden Foods Underground Tank 1405 South Fresno Avenue Stockton, California In response to your request of March 4, 1988, we have prepared this groundwater assessment plan to further evaluate the nature and extent of groundwater contamination at the above-referenced location. A preliminary assessment of groundwater contamination was provided by Kleinfelder and Associates in a report dated April 8, 1987. The report indicated that benzene, toluene, xylene, and ethylbenzene (BTXE) were not detected in the three wells. Monitoring Well MW-1 detected 0.3 ppm total petroleum hydrocar- bons. The groundwater gradient at this time was to the north. The wells were resampled by McClelland Engineers on February 16, 1988. The groundwater gradient at the time of sampling was to the northeast. No detectable concentrations of TPH or BTXE were found in the groundwater samples. To further evaluate groundwater characteristics at the project site McClelland proposes to install three additional groundwater monitoring wells. The wells will be constructed according to state and county requirements for monitoring wells. Our services will include the following: 1. Drill three borings to a depth of up to 20 feet below the water table; install 2-inch-diameter PVC wells (top of screen set at a depth of about 5 feet below ground surface) , locking covers and traffic boxes; develop each well and sample the groundwater accord- ing to EPA methodology. One groundwater sample will be collected from each well for chemical analysis. Soil samples will be obtained at 5-foot intervals in each boring. 2. Collect groundwater samples from the two existing on-site water supply wells.