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1.0 INTRODUCTION Conestoga-Rovers&Associates(GRA)has prepared this work plan on behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell) for the Former Shell Central Valley Crude Oil Pipelines located at Hansen Road near Schulte Road,in Cordes Ranch,Tracy, California (Figure 1). This work plan describes procedures to investigate soil conditions beneath a former crude oil pipeline right-of-way (ROW) located within a portion of the proposed Crossroads Business Center commercial development. Specifically, the proposed investigation areas are approximately 2,600 feet of former pipeline ROW northwest of the current investigation area shown on Figure 2, and approximately 3,700 feet of former pipeline ROW located southeast of the current investigation area. The proposed investigation activities will be performed in accordance with the Regional Water Quality Control Board,Central Valley Region(RWQCB) guidelines. A summary of previous work performed at the site and background information is presented in CRA's January 17,2011 Site Assessnient Work Plan and is not repeated here. 2.0 WORK PLAN The purpose of this investigation is to obtain information on the presence or absence of petroleum hydrocarbons in soil beneath the former pipelines. The following scope of work will be performed to achieve the investigation objectives: • Survey and mark the former pipelines • Advance soil borings at 300 feet (ft) intervals to evaluate soil conditions beneath the former pipelines. • If necessary, advance additional soil borings at locations of observed soil impact to define the soil impacts. 2.1 PERMITS AND PROPERTY ACCESS CRA will obtain drilling permits from the San Joaquin County Environmental Health Department. Prior to performing the assessment, property access approval and notification will be required for two property owners. OM22XI4) 1 CGNESTOGA-ROVERS R AssocIATEs