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Remedial Investigation/Feasibility Study Work Plan <br /> RAINWATER CAR WASH <br /> 420 West Yosemite Avenue, Manteca, California <br /> 1.0 INTRODUCTION <br /> Advanced GeoEnvironmental, Inc (AGE)has prepared this work plan for installation of one ground <br /> water extraction well, installation of one ground water observation well and performance of a ground <br /> water agwfer pump test at 420 West Yosemite Avenue (site), Manteca, California The location of <br /> the site is illustrated in Figure 1 A plan of the site is illustrated on Figure 2 <br /> On 02 March 2001, the California Regional Water Quality Control Board - Central Valley Region <br /> (RWQCB) directed by letter that an interim ground water pump and treat system be installed and <br /> continuously operated at the site In order to design an appropriate interim ground water pump and <br /> treat remediation system for the site, AGE believes an aquifer pump test is necessary to predict <br /> general aquifer characteristics at the site <br /> This Remedial Investigation/Feasibility Study Work Plan is prepared in accordance with California <br /> Regional Water Quality Control Board - Central Valley Region (RWQCB) guidelines for the <br /> investigation of underground storage tanks (UST) sites <br /> 7.0. BACKGROUND <br /> The site is located at 420 West Yosemite Avenue, at the southeast corner of Yosemite Avenue and <br /> Jessie Street The site is located in a topographically flat area at an elevation between 30 and 35 feet <br /> above mean sea level in Manteca, San Joaquin County, California The site is within the northeast <br /> quarter of Section 5, Township 2 South, Range 7 East, Mount Diablo Base and Meridian (Manteca <br /> Quadrangle, 7 5-Mmutc USGS Topographic Series, 1952, photo revised 1987) <br /> 21 SITE DESCRIPTION <br /> The site is presently operated as a fueling facility and a mini-market One 10,000-gallon UST, one <br /> 6,000-gallon UST and one 4,000-gallon gasoline UST were formerly located on the west section of <br /> the property One 12,000 gallon gasoline UST is presently located on the east section of the property <br /> 22 UNDERGROUND STORAGE TANK REMOVAL <br /> In December 1998, three gasoline U'STs (UST Nos 1, 2 and 3) and associated dispensers/product <br /> piping were removed from a west section of the site (see Figure 2) Upon removal, soil samples were <br /> • collected from the floor of the excavation and beneath product piping Total petroleum hydrocarbons <br /> quantified as gasolmc (TPI1-g) were detected in soil from beneath the Ldst ends of the three USTs <br /> ui a L is U I I u II --1, IIl <br />