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Site Assessment Work Plan Charlie's Day & Nite 706 North El Dorado Street, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with the request of Mr. Charles Skobrak of Charlie's Day & Nite, 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 706 North El Dorado Street, Stockton, California. The proposed scope of work initially includes advancement of three soil probe borings and collection of soil and grab water 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 I - Location Map. Structures and proposed soil probe boring locations on the site are illustrated on Figure 2 - Site Plan. 2.0. BACKGROUND One residence was located at the site in 1895, several residences were located at the site in 1917, based upon Sanborn Maps. Operation of a gasoline service station began at the site between 1937 and 1950, based upon aerial photographs and Sanborn Maps. Two 4.000-gallon USTs were removed from the southeastern portion of the site on 10 June 1997. The USTs had not been in operation for an unspecified length of time. Petroleum hydrocarbons were detected in the sample collected beneath the western end of the southern UST at a concentration of 11.000 ppm. Hydrocarbons were not detected in the three remaining samples collected beneath the USTs or one sample collected beneath "dispenser #1". The product piping was not removed or sampled. Soil removed during the UST removal was stockpiled at the southeastern corner of 121-123 E. Park Street. Further assessment is required by the PHS-EHD. 3.0. SCOPE OF WORK 3.1. DRILLING AND SAMPLING AGE proposes to initially advance three soil probe borings (probing) to depths of approximately 35 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 using AGE's Geoprobe soil probing unit. Advanced GeoEnvironmental,Inc.