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' 1.0 Introduction <br /> ' This report presents the results of the soil and groundwater investigation conducted at the <br /> intersection of State Route (SR) 120 and North Ripon Road, San Joaquin County, California <br /> (Figure 1). The property is located at Post Mile(PM) 9.82 of SR 120. The California <br /> Department of Transportation(Caltrans)proposes shoulder widening and intersection <br /> improvements at selected locations of SR 120 including the aforementioned project area. The <br /> ' purpose of this investigation is to determine the presence or absence of hazardous concentrations <br /> of fuel hydrocarbons within the aforementioned project area where soil excavation may occur <br /> ' during construction activities (Caltrans, 2001). All work was conducted within Caltrans <br /> right-of-way. <br /> This investigation was conducted at the request and authorization of Mr. Michael Robinson of <br /> Caltrans under Task Order No.I O-OA7401-ME, Expenditure Authorization No. 10-OA7401. <br /> ' 1.1 Project Description <br /> Caltrans proposes shoulder widening and intersection improvements at selected locations of <br /> ' SR 120 including the project area which is located at the intersection of SR 120 and <br /> North Ripon Road, San Joaquin County, California. Part of the rehabilitation of SR 120 will <br /> ' require ROW acquisitions. The information obtained by this project will be used to determine <br /> potential costs and liabilities as well as protect worker health and safety. <br /> Previous ISAs, the Regional Water Quality Control Board's Leaking Underground Storage Tank <br /> Information System (LUSTIS) list, and all available data from the VISTA Information Solutions <br /> ' Inc. database, have been reviewed to identify properties with hazardous waste concerns <br /> (Caltrans, 2002). The ISA identified the property as a former service station. Further field and <br /> ' archival research indicated that the location had formerly operated as a Mohawk gas station and <br /> that the service station was put out of business after a vehicle crashed into the pump island. <br /> ' A geophysical investigation was performed at the parcel under Task Order 10-OA7400-NY <br /> (Geocon, 2001). The findings from the geophysical investigation suggested that the underground <br /> ' storage tanks (USTs) beneath the pump island had been removed; however, SJCEHD indicated <br /> that they had no records of a tank removal at the site. The geophysical investigation did identify <br /> an anomaly indicating that a UST, possibly a waste oil tank, may still exist at the site. Site <br /> reconnaissance located the presence of piping,possibly vent pipes or fill spouts, at two locations <br /> 1 <br /> t4WCRFPIICOMMOMsecDN7002PR,MJBi6T634760.2m.doc -� <br />