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i �I WORK PLAN FOR INVESTIGATION OF REPORTED RELEASE FROM FORMER UNDERGROUND STORAGE TANKS CALIFORNIA TANK LINES FACILITY 3105 SOUTH EL DORADO STREET STOCKTON, CALIFORNIA SIERRA-PACIFIC PROJECT NO. 96-620.01 1.0 BACKGROUND This scope of work has been prepared in response to a reported release of waste oil or other petroleum hydrocarbons detected during removal of two underground storage tanks (USTs) from the above named property in August of 1990. The tanks were 6,000 gallons and 550 gallons in size, and had reportedly been utilized for receiving waste oil from trucking operations . The site is located at 3105 South El Dorado Street in Stockton, California. The site is an essentially level rectangular parcel underlain by laterally discontinuous beds of fluvial sediments . Groundwater on the site, based on regional information, is expected to lie below the depth of exploration proposed herein. The following scope of work is proposed. 2.0 PURPOSE OF INVESTIGATION The purpose of the current investigation is to determine the extent of the reported release of + dO petroleum hydrocarbons (waste oil) at the site. Impacts to soils in the vicinity of the former tanks will be assessed in accordance with the Tri-Regional Guidelines. Excavation, logging, and sampling of two soil borings is proposed in the vicinity of the former UST excavation. The proposed locations for the borings is shown on Figure 3 . The borings will be positioned adjacent to the former UST excavation. Logging of the borings will assist us in determining the nature of the subsurface soils. Soil samples will be analyzed for petroleum hydrocarbons. This information will be used to determine the extent of the reported release, and will aid in the selection and design of possible remediation efforts. Sierra-Pacific Groundwater Consultants, Inc. 1 � l