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1 <br /> QUARTERLY REPORT <br />' March 1996 <br /> Arco Mini Mart <br />' 4511 Pacific Avenue <br /> Stockton, California <br />' 1.0. INTRODUCTION AND SCOPE OF WORK <br /> tIn accordance with the request of Mr Art Wyatt, Adianced GeoEnvironmental, Inc (AGE) has <br /> prepared this Quarterly Report of monitoring activities for the site located at 4511 Pacific Avenue, <br />' Stockton, California Monitonng and sampling activities were performed on 07 March 1996 The <br /> location of the site is illustrated in Figure 1 -Location Map A plan of the site is illustrated in Figure <br /> 2 - Site Plata <br /> Monitoring was performed in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br />' Board (CVRWQCB) guidelines for investigations of underground storage tank (UST) saes <br /> 2.0. BACKGROUND <br /> 21 SITE DESCRIPTION <br /> The site is located at the northwest corner of Pacific Avenue and Rose Mane Lane in Stockton, <br /> California and currently operates as a gasoline dispensing station and mim-mart The facility consists <br /> of a building and three pump islands with a covered canopy <br /> 22 SITE ASSESSMENT <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 /> 2 3 UNDERGROUND STORAGE TANK REMOVAL <br /> Six USTs were removed from the site on 8 April 1994 Details of the USTs removal and soil sampling <br /> were presented in a report prepared by GAS In May 1994, two 12,000-gallon USTs and associated <br />