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1.0 INTRODUCTION At the request of Texaco Environmental Services (TES), Science & Engineering Analysis Corporation (SEACOR®) has prepared this Interim Soil Remediation Work Plan (SRWP) for the Texaco Service Station at 440 West Charter Way in Stockton, California. Previous environmental investigations performed by Groundwater Technology, Inc. (GTI) of West Sacramento, California have identified the presence of gasoline residual hydrocarbons in soil and groundwater beneath the site 1.1 Purpose of Interim Remedial Plan The purpose of this interim remedial plan is to summarize the results of environmental investigations performed to date, identify the appropriate technology, and implement a corrective action based on the results of investigations. The SRWP` presents results of hydrogeologic measurements, results of field tests and/or laboratory pilot studies, and conceptual remedial system design for a treatment system to remediate residual hydrocarbon impacted soil This information is presented in following sections of this report After approval of the SRWP by the appropriate agencies, corrective actions at the • site may proceed. 1.2 Background \� The site is located at 440 West Charter Way in the city of Stockton, California (Figure 1). The site is currently an operating retail gasoline station with four underground storage tanks (USTs); three 10,000 gallon and one 12,040 gallon. Locations of pertinent site structures and USTs are shown on the Site Plan (Figure 2). The site is bounded to the north by Charter Way and to the west by Lincoln Street To the north of the site across Charter Way and to the west across Lincoln Street are retail gasoline stations To the south and east of the site are retail businesses (Figure 3) A survey of wells within a half mile radius of the site indicated that there are three domestic wells and and one municipal well (GTI, October 9, 1990) This data was based upon the available information at the California Department of Water Resources in Sacramento, California. These well Iocations are shown on Figure 1. 1.3 Previous Site Investigations In October 1988 during new construction activities, soil containing hydrocarbons was observed beneath 2 pump islands during removal Soil beneath the eastern pump island was excavated to approximately 15 feet below surface grade (BSG). GTI collected samples from the sidewalls and bottom of the excavation and submitted the samples for laboratory analyses (GTI, 1990) Results indicated that the sample collected from the bottom of the excavation (15 feet BSG) contained gasoline hydrocarbons. Diesel range hydrocarbons were TEXSTOCK SRW SEACOR N0001-006-01 I