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SECTION 1 SOIL INVESTIGATION WORKPLAN Introduction The Manna Pro facility consists of a feed mill and warehouse located on El Dorado Street in Stockton, California. The mill is no longer in operation and a portion of the warehouse is being leased to a tenant. A Phase II site audit was conducted by WHF Environmental Consultants in February 1990. During the site audit five underground fuel tanks were identified in the northwest corner of the property. The fuel tanks were removed by SEMCO (a subcontractor to WHF) in June 1990. Diesel and gasoline contamination was found in the underlying soils after the tanks were removed. Contamination was also found underneath the fuel pumps, to the southeast of the tanks. A re-excavation workplan was prepared by WHF in July 1990 and approved by San Joaquin County. Approximately 2,500 cubic yards of soil were then excavated from the area and stockpiled on site. An addendum to the re-excavation workplan calling for removal of 5,000 cubic yards of soil was filed with San Joaquin County on September 12, 1990, and was recently approved by the County. The activities proposed in this Soil Investigation Workplan will be pursued under the auspices of the September 12th addendum. The County requested this workplan to further specify the work to be undertaken. Current Situation Currently there is a large excavation pit in the parking lot near the northwest corner of the property. Soil has been mounded around.the pit and a temporary fence has been placed on top of the mounded soil. The excavated soil has been segregated into stockpiles of clean soil - and contaminated soil. Soil samples have been submitted for laboratory analysis on two occasions during the past nine months. Seven soil borings were drilled in conjunction with the Phase II site assessment report in February 1990, and samples were collected at an elevation of 15 feet below grade. In July, 1990, ten additional soil samples were collected