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QUARTERLY REPORT <br /> April 1996 <br /> Rbpon Farm Service <br /> 22871 South Highway 99 <br />' Ripon, California <br /> 1.0. INTRODUCTION AND SCOPE OF WORK <br /> In accordance with a request from Ripon Farm Service (RFS),Advanced GeoEnvironmental, Inc <br /> (AGE)has prepared this report for 22871 South Highway 99, Ripon, California The report details <br /> quarterly monitoring and sampling activities performed at the site in April 1996 The location of the <br /> site is illustrated in Figure 1 - Location Map A plan of the site is depicted in Figure 2 -Site Plan <br /> Monitoring and sampling activities were conducted in accordance with both the San Joaquin County <br /> Public Health Services - Environmental Health Division (PHS-EHD) and the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of <br /> underground storage tank(UST) sites <br /> 20 BACKGROUND <br /> M21 SITE LOCATION <br /> The site is located in an industrial area of low topographic relief in northern Ripon,east of Jack Tone <br /> Road(Figure 1) The site is currently operated by Ripon Farm Service (RFS) An automotive shop <br /> is located near the northeast corner of the site and an office building and truck scale are located at <br /> the southern corner The surface of the remainder of the site is covered with gravel Jimco Truck <br /> Stop is located immediately north of the site <br />' 2 2 UNDERGROUND STORAGE TANK REMOVAL <br /> ' Four USTs were removed from the site on 15 July 1987 One 10,000-gallon diesel tank (Tank #1) <br /> and one 7,500-gallon diesel tank(Tank#2)were located near the tuning shop, and one 10,000-gallon <br /> unleaded gasoline tank (Tank 93) and one 10,000-gallon diesel tank (Tank #4) were located <br /> ' approximately 120 feet east of the shop Petroleum hydrocarbons were detected in soil samples <br /> collected below Tanks #1, #2, and#3 <br /> 1 <br /> 2 3 ASSESSMENT OF HYDROCARBON-IMPACTED SOIL AND GROUND WATER <br /> ' In April 1994,three ground water monitoring wells and five soil bonngs were drilled and installed <br /> at the site by Geological Audit Services,Inc (GAS) Hydrocarbon-impacted soil and ground water <br /> i <br />