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v BACKGROUND LSan Joaquin County removed an underground storage tank gr g at the Corral Hollow Sanitary Landfill, located at 31130 S. Corral Hollow Road, Tracy, California on February 16, 1996. Soil tests taken after the tank's removal indicate diesel fuel contamination at the tank removal and fuel dispenser sites. LSoil tests were taken in the undisturbed soil at the east and west ends of the tank, at the dispenser, as well as two composite samples of the excavated soil stockpile. Test results indicate a diesel 02 concentration of 190 mg/kg, 1900 mg/kg, and 54,000 mg/kg at the east and west ends of the tank, and at the dispenser .respectively. ` L The San Joaquin County Public Health Services Department has cited the site for diesel fuel soil contamination (Exhibit 1) . They have also requested a plan describing further assessment of the extent of contamination and corrective action. This plan details the methods proposed by the County Department of Public Works to determine the extent of contamination, and remediate the site for Lclosure. L- 101 DETERMINATION OF EXTENT OF CONTAMINATION The Corral Hollow Sanitary Landfill is located approximately 5 miles southwest of the City of Tracy (Figure 1) . The tank removal site is located near the shop building in the northeast corner of the landfill property. (Figure 2) . . It will be excavated 8 to 10 feet below the bottom of the tank removal depth. The excavated soil will be placed on visquene plastic adjacent to the tank removal site. An in-situ soil test for diesel 12 will be taken at a point in the excavated site favoring the west 1/3 of the tank L removal area where the contamination was the greatest. The sample will be taken as directed by a Registered Environmental Health Specialist from the County's Environmental Health Division. LTesting of the sample will be performed by a certified laboratory. The dispenser location will be excavated to a depth of 5 feet below L its existing grade. The excavated soil will be placed on visquene plastic adjacent to the dispenser site, separate from the excavated soil from the tank site. After the dispenser area is excavated, an in-situ soil sample will be taken as directed by the Registered L Environmental Health Specialist from the County's Environmental Health Division. As with the sample taken from the tank removal area, the sample taken from the dispenser area will be tested by a Lcertified laboratory. The excavations will be left open until the test results are known. �i✓ A safety fence will be placed around the excavated areas while the Lexcavations are open. L