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03/16/2001 11:33 20946710 AGE STOCKTON • PAGE 04 <br /> 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 aquifer 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 /> 2.0. 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-Minute USGS Topographic Series, 1952,photo revised 1987). <br /> 2.1. 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 /> 2.2. UNDERGROUND STORAGE TANK REMOVAL <br /> In December 1998, three gasoline USTs(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 gasoline (TPII-g)were detected in soil from beneath the east ends of the three USTs <br /> Advanced Ga Emironm-ntvl,rnG <br />