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' 1. 0 INTRODUCTION <br /> This report presents the results of Tank Protect Engineering of <br />' Northern California ' s (TPE) subsurface investigation at -2A-3-74 2�'3 <br /> Waterloo Road, Stockton, California (see Figure 1) . The purpose <br /> of this investigation was to characterize the subsurface soil and <br />' groundwater quality beneath the property. <br /> This site assessment was authorized by E-Z Serve Petroleum <br />' Marketing Company' s (E-Z Serve) May 1 , 1992 confirmation letter. <br /> The investigation was conducted in accordance with the E-Z Serve <br /> March 3 , 1992 Work Plan and TPE ' s subsequent May 26 , 1992 Health <br /> and Safety Plan. Prior to implementing the work, both documents <br />' were submitted to and approved by the San Joaquin County Health <br /> Services Department (SJCHSD) . <br /> This Preliminary Site Assessment Report (PSARI includes: 1) a <br /> limited review of site background information; 2) the <br /> construction of 5 groundwater monitoring wells; 3 ) the collection <br /> and laboratory analysis of selected soil and groundwater samples; <br />' 4) determination of groundwater flow direction and gradient <br /> beneath the site; and 5) the preparation of this PSAR summarizing <br /> TPE' s findings. <br /> t <br /> 2 . 0 SITE HISTORY <br /> Background information provided by E-Z Serve documents that the <br /> site was formerly a gasoline/mini-mart containing 1 - 8000 gallon <br /> and 2 -- 10, 000 gallon underground gasoline storage tanks. Each <br /> tank was of single walled steel construction. The ages of the <br /> tanks are unknown. The gasoline dispensing facility was closed <br /> on March 3 , 1990 and the tanks were removed on March 8 , 1990 . <br />' The general configuration of the site is shown on Figure 2 . On <br /> August 5 , 1991 a preliminary soils investigation was conducted by <br /> Nachant Environmental Inc. (NEI) . NEI drilled and sampled three <br /> exploratory soil borings (B-1, B-2 , and B-3) . Details of this <br />' preliminary study were submitted to E-Z Serve in a report dated <br /> November 22 , 1991. According to Linda Turkatte (SJCHSD <br /> representative) laboratory results of soil samples selected for <br />' chemical analyses detected petroleum hydrocarbons in at least one <br /> sample from each boring . Analytical results from this study were <br /> not available for TPE' s review prior to implementing the present <br />' investigation. <br /> 3 . 0 SOIL AND GROUNDWATER INVESTIGATION <br />' On May 1, 1992 TPE was contracted by E-Z Serve to drill and <br /> install 5 monitoring wells (designated MW-1 through MW-5) at the <br /> site. The purposes of this investigation were 1) to further <br /> characterize the subsurface vadose zone soils, 2) to investigate <br /> 1 <br />