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Work Plan ,Addendum August 1999 <br /> • RAINWATER CAR WASH <br /> 420 West Yosemite Avenue,Manteca,California <br /> I.O. INTRODUCTION <br /> At the request of Mr Phil Elder,Advanced GeoEnvironmental,Inc (AGE)has prepared this work <br /> plan addendum for the site located at 420 West Yosemite Avenue, Manteca, California(site) The <br /> location of the site is illustrated on Figure 1 A plan of the site is illustrated on Figure 2 <br /> Tlie San Joaquin County Public Health Services - Envirotiziuental Health Division (PHS-EHD)has <br /> directed by letter, dated 07 July 1999, that a work plan addendum be prepared for a soil vapor <br /> extraction (SVE) and air sparging (AS) feasibility pilot study Trus work plan is prepared in <br /> accordance with PHS-EHD and Central Valley Regional Water Quality Control Board(CVRWQCB) <br /> gwdelines for the investigation of underground storage tanks(UST) sites <br /> This work plan addendum provides a description of the scope of work and procedures for the <br /> installation of two SVE wells,one AS well,performance of a SVE and AS feasibility pilot test and <br /> a ground water pump test <br /> 2.0. BACKGROUND <br /> The site is located at 420 Wzzt liluscmi;e 1yvenuc, on the soutneast corner at the intersection of <br /> Yosemite.Avenue and Jessie Street The site is located in a topographically flat area at an elevation <br /> between 30 and 35 feet above mean sea level in Manteca, San Joaquin County, California The site <br /> is within the northeast quarter of Section 5, Township 2 South, Range 7 East, Mount Diablo Base <br /> and Meridian (Manteca Quadrangle, 7 5-Minute USGS Topographic Series, 1952, photo revised <br /> 1987) <br /> 2 7 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 /> 7 2 UNDERGROUND STORAGE TANK REMOVAL <br /> In December 1998,three gasoline USTs(UST Nos I through 3) and associated dispensers/product <br /> piping were removed from a west section of the site(see Figure 1) Upon removal,soil samples ti�ere <br /> collected from the floor of the excavation and beneath product piping Total petioleuni hydrocarbons <br /> . A&at,ned GcoEnNiroamtaisj Inc <br />