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1 " <br /> PRELIMINARY INVESTIGATION AND EVALUATION REPORT <br /> Stockton Municipal Wastewater Treatment Plant <br />' 2500 Navy Drive <br /> Stockton, California <br />' JuIy 1995 <br />' 1.0. INTRODUCTION/SCOPE OF WORK <br /> In accordance with a request from the City of Stockton - Department of Public Works, Advanced <br />' GeoEnvironmental Inc (AGE) has drilled four soil bonngs and installed one ground water monitoring <br /> well at 2500 Navy Drive in Stockton, California (the site) <br />' The investigation was performed in accordance with Tn-ReVonal Board and San Joaquin County <br /> Public Health Services-Environmental Health Division (PHS-EHD) guidelines for the investigation <br />' of underground storage tank (UST) saes The location of the site is illustrated on Figure 1 A site <br /> plan is depicted in Figure 2 <br />' The scope of work was performed in accordance with a Request for Bid (RFB) dated 17 January <br /> 1995 purposed by the City of Stockton <br />' •� 2.0. BACKGROUND <br />' 2 1 SITE LOCATION <br /> The site is located in a fiat industrial area of the western portion of the Port of Stockton in San <br />' Joaquin County, Cahfornia The City of Stockton Municipal Waste Water Treatment Plant is located <br /> on the site <br />' 2 2 UNDERGROUND STORAGE TANK REM <br /> OVAL <br /> In July 1994, one 5,000-gallon UST and one 3,000-gallon UST were removed from the site by Goins <br /> Environmental Construction of Sacramento, California Soil samples were collected from beneath <br /> the USTs at the time of removal Total petroleum hydrocarbons quantified as gasoline and volatile <br /> aromatics were detected in two soil samples from the UST excavation Based upon laboratory results <br /> of soil samples from the UST removal, the PHS-EHD required further investigation to deterrmne the <br /> Iextent of the hydrocarbon-impacted soil and/or ground water at the site <br />