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Work Plan Addendum RAINWATER CAR WASH ' 420 West Yosemite Avenue, Manteca, California 1.0. INTRODUCTION At the request of Phil Elder of Rain Water Car Wash,Advanced GeoEnvironmental,Inc(AGE)has ' prepared this work plan addendum for the installation of six multi-level ground water monitoring wells at 420 West Yosemite Avenue,Manteca,California(site).The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan addendum complies with letter directives from the California Regional Water Quality ' Control Board(RWQCB)-Central Valley Region dated 02 March 2001 and the San Joaquin County Environmental Health Department(SJCEHD)dated 09 March 2001 (Appendix A).This work plan addendum is being submitted to characterize and delineate the vertical extent of petroleum ' hydrocarbon-impacted soil and ground water at the site and is in accordance with RWQCB guidelines for the investigation of underground storage tanks (UST) sites. This work plan provides the scope of work and procedures for installation of seven(7)multi-level ground water monitoring wells at the site. ' 2.0. BACKGROUND ' The site is located at 420 West Yosemite Avenue, at the southeast corner of Yosemite Avenue and Jessie Street in a topographically flat area at an elevation between 30 and 35 feet above mean sea level in Manteca,San Joaquin County,California.The site is within the northeast quarter of Section 5, Township 2 South, Range 7 East, Mount Diablo Base and Meridian (Manteca Quadrangle, 7.5- Minute USGS Topographic Series, 1952, photo revised 1987). ' 2.1. SITE DESCRIPTION The site is presently operated as a fueling facility and a mini-market. One 10,000-gallon UST, one 6,000-gallon UST and one 4,000-gallon gasoline UST were formerly located on the west section of ' the property.One 12,000 gallon gasoline UST is presently located on the east section of the property. 2.2. UNDERGROUND STORAGE TANK REMOVAL In December 1998, three gasoline USTs (UST Nos. 1, 2 and 3) and associated dispensers/product ' piping were removed from a west section of the site(see Figure 2).Upon removal,soil samples were collected from the floor of the excavation and beneath product piping.Total petroleum hydrocarbons quantified as gasoline(TPH-g)were detected in soil samples collected beneath the east ends of the ' Advanced GmEnvironmental,Inc.