SITE INFORMATION AND CORRESPONDENCE

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- h-9 KLEINFELDER 2 BACKGROUND The Leprino Foods facility,.located at 2401 MacArthur Drive in Tracy, California (Plate 1), is used to manufacture cheese for bulk distribution. The facility consists of one large building complex to the south and a smaller complex to the north. The larger complex provides office space, milk receiving and processing, and cheese shipping/receiving services. The smaller complex dries, warehouses, and ships milk by-products. A 10,000-gallon above ground diesel tank, a 10,000 gallon above-ground fuel oil tank, and a 500- gallon above-ground waste oil tank are located inside an above-ground cinder block containment compound just to the south of the milk by-products warehouse. Both 10,000-gallon tanks were filled by 3-inch pipelines which surface approximately 12 feet outside the containment wall. Adjacent to the pipelines was a fuel dispenser pump for the diesel tank. On February 24, 1992, employees from Leprino Foods noticed diesel fuel along joint cracks in the concrete apron around the containment wall and at the fuel dispenser. Subsequently, the fuel dispensing pump, the concrete in the immediate vicinity of the pump, and the soil to a depth of approximately 2 feet around the fuel line were removed. On March 13, 18, and 19, 1992, approximately 140 cubic yards of soil were excavated from the vicinity of the pipelines. An additional 10 cubic yards of soil were removed on March 20, 1992 by Semco. Two soil samples were collected from the bottom of the excavation, one from the northeast quadrant at a depth of four feet and one from a depth of eleven feet under pipeline's previous location and were analyzed for total petroleum hydrocarbons, diesel range (TPH-D. TPH-D) was not detected at the laboratory's reporting limit in the northeast 4-foot depth sample. The 11-foot depth soil sample from under the pipelines was reported to contain 1,000,000 mg/kg TPH-D. A groundwater sample was collected from a depth of I 1-1/2 feet on March 18, 1992 in the excavation using a BAT vacuum sampling device. Free product was observed in the water sample, and therefore diesel saturation of the sample was assumed and the sample was not analyzed. The results of the excavation water and soil sampling were presented in Kleinfelder's "Soil Sampling Results," letter report, dated March 25, 1992. On April 24, 1992, Kleinfelder collected sidewall and bottom samples to verify removal of petroleum hydrocarbons from the excavation. The three bottom samples were composited and 24-220176-FOl/CR43-8 (1994) Page 2 of 13 June 3, 1994 Copyright 1994 Kleinfelder, Inc. i