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CONSULTANTS, INC. E NVI RONME NTAL ■ GEOTEC H N ICAL ■ MATERIALS _ Project No. S8475-06-70 April 30,2003 MAY 0 1 2003 Mr. Gary Gagliolo `) z"l 3•-Z�L ENVIRONMENT HEALTH California Department of Transportation-District 10 FERMITMSE"CES 2015 E. Shields Avenue Fresno,California 93726 Subject: STATE ROUTE 132-VERNALIS EXPRESSWAY SAN JOAQUIN COUNTY,CALIFORNIA CONTRACT NO.43AO078,TASK ORDER NO. 10-OA5100-BG PRELIMINARY SITE INVESTIGATION WORKPLAN Dear Mr. Gagliolo: In accordance with the California Department of Transportation (Caltrans) Contract No. 43AO078 and Task Order (TO) No. 10-OA5100-BG, Geocon Consultants, Inc. is submitting this Workplan for site investigation work to be conducted for the State Route 132 (SR-132) Vernalis Expressway project near Vernalis, California (the Site). This Workplan describes the scope of services requested by Caltrans and outlines procedures and methods to be employed by Geocon to complete the project. PROJECT LOCATION AND DESCRIPTION The project site consists of proposed highway improvements at 2500 East SR-132 in the Vernalis area of San Joaquin County, California. The Site contains an abandoned service station building, concrete pad supporting a fuel pump island, a metal aboveground storage tank(AST) and associated filler pipe. Diesel fuel is thought to have been used at the station. A buried septic tank is also thought to be onsite. The approximate project location and area of investigation are depicted on the Vicinity Map, Figure 1 and Site Plan, Figure 2. BACKGROUND The following background is based on information provided to Geocon by Caltrans. The results of an Initial Site Assessment (ISA) prepared by Caltrans identified an abandoned service station located at 2500 East SR-132, San Joaquin County, California. The service station is within the new Caltrans right of way on the south side of SR-132. PURPOSE The purpose of the scope of services outlined in the subject TO is to determine the potential presence of hydrocarbons and/or heavy metals contamination in the soil and to determine if buried underground storage tanks (USTs), piping or other structures are present. The contaminants of concern at the Site include oil and grease (O&G), total petroleum hydrocarbons as motor oil (TPHmo), total petroleum hydrocarbons as diesel (TPHd) and Title 22 metals. The proposed area of investigation is depicted on Figure 2. An estimate of the extent of potential site contamination is necessary prior to highway construction in order to determine approximate removal and disposal costs and to reduce risks to workers and to public health. 11375 Sunrise Park Drive, Suite 100 0 Rancho Cordova,California 95742 0 Telephone(916) 852-9118 0 Fax(916) 852-9132