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Preliminary Site Assessment Work Plan WEVER TRUCKING 777 South Locust Street, Ripon, California 1.0. INTRODUCTION At the request of Mr. Barry Wever, Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Work Plan for the Wever Trucking site located at 777 South Locust Street, Ripon, California. The location of the site is illustrated on Figure 1 - Location Hap. A plan of the site is illustrated on Figure 2 - Site Plan. This Work Plan has been prepared as required by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) to evaluate an unauthorized release of petroleum hydrocarbon compounds from an underground storage tank (UST) formerly located at the site. Additionally, this work plan is prepared in accordance with PHS-EHD and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of UST sites. The purpose of this preliminary site assessment is to complete the evaluation of the vertical extent of petroleum hydrocarbon impacts to soil and/or groundwater at the site. This Work Plan provides a description of the scope of work and procedures to be used in soil probe borings, soil and groundwater sample collection and analysis, and soil boring abandonment. 2.0. BACKGROUND The site is currently utilized as a truck repair facility for a fleet of company owned tractor-trailers. One 750-gallon waste oil underground storage tank (UST) was removed on 13 June 1991. At the time of removal PHS-EHD was unable to properly evaluate the site for closure. In a letter dated 14 December 1992 from PHS-EHD personnel, "an Underground Storage Tank Unauthorized Release (Leak)/Contaminated Site Report has not been filed for this site nor is it considered contaminated." In order to receive a site closure certification the PHS-EHD is requiring further site investigation in the area of the former UST. 3.0. SCOPE OF WORK The scope of work will initially include the advancement of one soil probe boring to a depth of 30 feet below surface grade (bsg). However, if field observations indicate that hydrocarbons are present at the site, the probe boring may be advanced to greater depth,�ror additional probe borings may be advanced. Soil samples will be collected from each probe boring; grab ground water samples will be collected from selected borings. Assessment activities will include the following tasks: • Performance of a sensitive receptor/well survey; Advanced Geo Environmental,Inc.