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Site Assessment Work'Plan Mid Valley Trailer Sales 2421 (2461)North Wilson Way, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with the request of Mr. Robert Reeder,Advanced GeoEnvironmental, Inc. (AGE) has prepared this Site Assessment Work Plan for investigation of hydrocarbon-impacted soil and ground water associated with an unauthorized release of petroleum hydrocarbons from an underground storage tank (UST) system at 2461 North Wilson Way, Stockton, California. The former street address was 2421 North Wilson Way. The proposed scope of work initially includes advancement of four soil probe borings and collection of soil samples. Additional probings may be advanced based upon field observations. This work plan was prepared in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board(CVRWQCB) guidelines for the investigation of UST sites. The site location is illustrated on Figure 1 - Location Map. Structures and proposed soil probe boring locations on the site are illustrated on Figure 2 - Site Plan. 2.0. BACKGROUND The site is located on the west side of Wilson Way, south of Sanguinetti Lane. One building is currently located on the site. The remainder of the site is gravel parking area. The site is currently occupied by Pacific Towing. It is our understanding that one 1,000-gallon regular gasoline UST was removed from the north side of the building in August 1991. Total petroleum hydrocarbons quantified as gasoline (TPH-g) was detected in a sample collected beneath the dispenser a concentration of 280 parts per million (ppm). In September 1997, approximately 20 cubic yards of soil was excavated at the former dispenser location to a depth of 7 feet below surface grade. TPH-g was detected at a concentration of 8,100 ppm in a soil sample collected from the bottom of the excavation. The PHS-EHD has required additional investigation to define the vertical and lateral extent of impact. 3.0. SCOPE OF WORK 3.1. DRILLING AND SAMPLING AGE proposes to initially advance four soil probe borings (probing) to depths of approximately 30 feet below surface grade (bsg). Probings may be advanced to greater depths or additional probings may be advanced based upon field observations, time permitting. The probings will be advanced Advanced GeoEnvironmental,Inc.