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QUARTERLY REPORT <br /> December 1995 <br /> .. Arco Mini Mart <br /> 4511 Pacific Avenue <br /> Stockton, California <br /> .. <br /> 1.4. INTRODUCTION AND SCOPE OF WORK <br /> In accordance with the request of Mr. Art Wyatt, Advanced GeoEnvironmental, Inc. (AGE) has <br /> prepared this Quarterly Report of monitoring activities for the site located at 4511 Pacific Avenue, <br /> `' Stockton, California. Monitoring and sampling activities were performed on 22 December 1995. The <br /> location of the site is illustrated in Figure I -Localion Map. A plan of the site is illustrated in Figure <br /> 2 - Site Plan. <br /> Monitoring was perforin-d in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EI-TD) and Central Valley Regional Water Quality Control <br /> Board (CVR'vVQCB) guidelines for investigations of underground storage tank (UST) sites. <br /> 2.0. BACKGROUND <br /> 2.1. SITE DESCRIPTION <br /> The site is located at the northwest corner of Pacific Avenue and Rose Marie Lane in Stockton, <br /> L- California and currently operates as a gasoline dispensing station and mini-mart. The facility consists <br /> of a building and three pump islands with a covered canopy. <br /> 2.2. SITE ASSESSN41ErJT <br /> In February 1991, a broken coupling in a product line was discovered and repaired. During repair <br /> procedures, hydrocarbon-impacted soil was discovered beneath the product line. Subsequently, the <br /> PHS-EHD required an assessment of the vertical and lateral extent of the hydrocarbon impact. <br /> Between 1991 and 1993, three soil borings, one vapor extraction well and three ground water <br /> monitoring wells were installed at the site by Geological Audit Services, Inc. (GAS). The vertical and <br /> lateral extent of hydrocarbon-impacted soil and ground water were delineated to the satisfaction of <br /> the PHS-EHD. <br /> L. <br /> n 2.3. UNDERGROUND STORAGE TANK REMOVAL <br /> V <br /> Six USTs were removed from the site on 8 April 1994. Details of the USTs removal and soil <br /> sampling were presented in a report prepared by GAS. In May 1994, two 12,000-gallon USTs and <br /> r <br />