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L i . 1 0 INTRODUCTION SECOR International Incorporated (SECOR) has prepared this report to present the results of the installation and start-up of a soil vapor extraction and treatment system at 440 West Charter Way, in Stockton, California (Figure 1) Texaco Refining and Marketing Inc (Texaco) currently owns and operates a gasoline service station and car wash at this site Previous environmental investigations performed by Groundwater Technology, Inc (GTT) of West Sacramento, California have identified the presence of petroleum hydrocarbons in soil and groundwater beneath the site Because several other sources to the groundwater contaminant plume have been identified in and around the intersection of Charter Way and Lincoln Avenue, interim soil remediation was approved for the site while a cooperative effort between all responsible parties is organized to address the impacted groundwater 12 Background In October 1988 during new construction activities, hydrocarbon impacted soil was observed a beneath two pump islands Soil beneath the eastern pump island was excavated to approximately 15 feet below ground surface (bgs) GTI collected samples from the sidewalls of the excavation and submitted the samples for laboratory analyses Results indicated that the sample collected from the bottom of the excavation (15 feet bgs) was impacted with gasoline hydrocarbons Diesel range hydrocarbons were not detected From May 1989 to present, twenty soil borings were drilled, sixteen groundwater monitor wells were installed, four nested vapor extraction wells were installed, and a vapor extraction test performed Locations of soil borings, groundwater monitor wells, and vapor extraction wells are shown on Figure 2 In June 1992, GTI performed a vapor extraction test (VET) utilizing the four nested vapor extraction wells According to GTI, the results of the VET indicated that vapor extraction is . 440ASB RYr 1SECOR !ob No N0001-006.01 September I Z 1996