SITE INFORMATION AND CORRESPONDENCE

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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO 91-722 CLEANUP AND ABATEMENT ORDER FOR DELTA TRUCK SALES, INC. SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: 1 . Delta Truck Sales, Inc. (hereafter Discharger) is a truck fueling, repair, and sales facility in northwest Stockton. Mr. Ken Smith is President and Mr. Darrell Smith is Vice President of Delta Truck Sales, Inc. The facility is in the NW-1/4 of Section 53, T2N, R7E, MDB&M. The San Joaquin County Assessor's Parcel Number is 092-200-007. 2. A surface impoundment (SI) was constructed in 1970 on the north side of the facility in an area formerly used as a dump or landfill in the 1950s, and possibly over an open trench which reportedly traversed the site. Reported dimensions of the surface impoundment in 1970 were 20 feet by 40 feet, with depths ranging from 4 to 8 feet and a maximum capacity of roughly 36,000 gallons. However, on a 1979 aerial photo, the SI appears to have been roughly 120 feet by 90 feet. 3. The Discharger steam-cleaned vehicles and vehicle parts on a wash pad area adjacent to the unlined SI. The steam-cleaning wastewater was discharged into the SI between 1970 and March 1985. After March 1985 the SI was backfilled with dirt and rubble from local construction soil and covered with 8 to 12 inches of a 3/4" gravel and clay mixture. The closure and removal of sludges from the surface impoundment was not documented or supervised by a qualified professional . Two sumps followed by a septic tank, which acted as oil/water separators, and a leachline system were installed to handle steam-cleaning discharges in April 1985. The septic tank was removed during the first soils excavation performed in 1989. 4. In March and July 1987, the Discharger drilled soil borings into the buried surface impoundmet and collected waste samples. A Waste Extraction Test was run on the samples and soluble lead values of 27 and 28 mg/L were obtained. Waste that contribute 5 mg/l or more soluble mg/L or more soluble lead to the leachate from a Waste Extraction Test are hazardous according to Section 66699 of Title 22 of the California Code of Regulations (22 CCR) . 5. The ground water aquifers directly underlying the site are waters of the state and potential sources of drinking water. The surface impoundments are within one-half mile of a potential source of drinking water.