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r GRA YLAND ENVIRONMENTAL ry6ONS'ULTINGSERVICES July 11, 1997 ��'S/ 022-151 Ms. Margaret Lagorio San Joaquin County Environmental Health Division 304 E. Weber Avenue, Third Floor Stockton, California 95201-0388 Subject: Interim Remedial Action Work Plan- Soil Excavation Subsurface Environmental Investigation, 1405 California Street, Escalon, California Dear Ms Lagorio: Grayland Environmental (Grayland) has prepared this Interim Remedial Action Work Plan for excavating and removing known contaminated soil from beneath the former fuel dispenser area at the site located at 1405 California Street in Escalon, California(Figure 1). Our proposed scope of work entails enlarging the existing trench excavation beneath the former fuel dispenser area at the site(Figure 2). Immediately following the excavation work, soil samples will be collected from the sidewalls and base of the enlarged excavation. The soil samples will be analyzed at a certified environmental laboratory. The results of the laboratory analyses will be presented in a written report to the San Joaquin County Environmental Health Division for review. Soil Excavation Soil beneath and surrounding the former fuel dispenser area at the site will be excavated and removed from the subsurface by Walton Engineering, Inc. of West Sacramento, California. We anticipate enlarging the existing trench excavation to no greater than approximately 8 to 10 feet towards the south; 8 to 10 feet towards the east; 8 to 10 feet towards the north; and to a depth of approximately 8 to 10 feet below ground surface. Soil removed from the subsurface will be stockpiled on AC paving at the site and covered with plastic sheeting for a brief interim, pending laboratory results of soil characterization samples. The enlarged excavation will be backfilled to near grade with base rock immediately following the soil sample collection work. Soil Sample Collection Soil samples will be collected from the bucket of the excavator immediately after removing soil from the sidewalls and base of the open excavation. To collect a-soil sample, a clean stainless steel sample sleeve will be driven into a relatively undisturbed portion of the soil contained in the excavator bucket using a hand-operated ATM percussion core sampler. One soil sample will be collected for every approximate 20 lineal feet;of exposed sidewall, and one soil sample will be collected for every approximate 200 square feet of exposed base. Each soil sample will be sealed 2731 Quail Street Davis, California 95616 (916) 756-1441 Grayland 022-151.scw l July 11,1997