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' Work Plan Addendum- June 2001 <br /> TOP FILLING STATION <br /> ' 101 South Wilson Way, Stockton, California <br /> ' 1.0. INTRODUCTION <br /> ' At the request of Ed Endich of Top Filling Station,Advanced GeoEnvironmental, Inc (AGE) has <br /> prepared this work plan addendum for the installation of two multi-level ground water monitoring <br /> wells at 101 South Wilson Way, Stockton, California(site). The location of the site is illustrated on <br /> ' Figure 1. A plan of the site is illustrated on Figure 2. <br /> This work plan addendum is being submitted to characterize and delineate the vertical extent of <br /> petroleum hydrocarbon-impacted soil and ground water at the site. This work plan addendum <br /> complies with a letter directive from the San Joaquin County Public Health Services-Environmental <br /> Health Department (PHS-EHD) dated 03 June 1999 and has been prepared in accordance with <br /> ' California Regional Water Quality Control Board (RWQCB) guidelines for the investigation of <br /> underground storage tanks (UST) sites. <br /> ' This work plan provides the scope of work and procedures for installation of two multi-level ground <br /> water monitoring wells at the site. <br /> ' 2.0. BACKGROUND <br /> ' The site is located at 101 South Wilson Way, on the southwest corner of the intersection of Wilson <br /> Way and Market Street in Stockton, California (Figure 1).The site is within the northwest quarter <br /> ' of Section 32, Township 1 North, Range 6 East, Mount Diablo Base and Meridian (Stockton West <br /> Quadrangle, 7.5-Minute USGS Topographic Series, 1968, photo revised 1987). <br /> ' 2.1. SITE DESCRIPTION <br /> ' The Top Filling Station formerly operated as a gasoline dispensing station and automobile repair <br /> facility circa 1925 through 1998. A warehouse/auto repair shop and service station building are <br /> located on the site. The surrounding area is utilized for residential and light industrial purposes. <br /> 2.2. UNDERGROUND STORAGE TANK REMOVAL <br /> 1 It is AGE's understanding that two gasoline USTs were removed from a north section and a <br /> southwest section of the site in December 1988. Soil samples collected beneath the USTs detected <br /> ' total petroleum hydrocarbons quantified as gasoline (TPH-g) and the volatile aromatic compounds <br /> benzene, toluene, ethylbenzene and xylenes (BTE3Q at concentrations ranging up to 2,200 <br /> milligrams per kilogram (mg/kg). <br /> Advanced CeoEnvironmental,Inc. <br />