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'L Preliminary Subsurface Investigation Work Plan Woodbridge Arco- Store No. 5650 18970 Lower Sacramento Road,Woodbridge, California 1.0. INTRODUCTION At the request of Mr. Lawrence Wight of Wight Enterprises, Advanced GeoEnvironmental, Inc. (AGE) has prepared the this Preliminary Subsurface Investigation Work Plan for the property at 18970 Lower,Sacramento Road, Woodbridge, California (the site). The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan is prepared as required by the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD)for the procurement of a soil boring permit. The work is being performed to assess for possible environmental concerns associated with'the operation of an underground storage tank(UST)system on the property.The work plan is prepared in accordance with Appendix A.to Tri-Regional Recommendations -Reporting, dated 30 August 1991, prepared by the Central Valley Regional Water Quality Control Board (Appendix A - Reports) for the investigation of underground storage tank (UST) sites. 2.0. BACKGROUND The site is located at 18970 Lower Sacramento Road in an unincorporated portion of northern San Joaquin County, California. The site is located in a mixed use area of Woodbridge (Figure 1). The property is comprised of a single parcel and is currently occupied by an-Arco Mini-Mart gasoline service station(Figure 2). Based upon a site reconnaissance of the property, it appears that two monitoring wells and/or soil vapor wells may be present on the property. Prior to conducting field work, AGE will conduct a review of PHS-EHD files to determine the nature of the wells. The estimated depth to ground water at the subject property is approximately 25 feet bsg,based on the map titled Lines of Equal Depth to Groundwater,Fall 1998 published bythe San Joaquin County Flood Control District and Water Conservation District (FCD&WCD). It is inferred from the map titled Lines of Equal Elevation of Groundwater, Fall 1998, also published by the FCD&WCD,that groundwater elevation at the subject property is approximately 5 feet below mean sea level and that the local groundwater flow is toward the south at the subject property, but this may be greatly modified.by local recharge and discharge patterns.The.Mokelumne River is approximately 300 feet east of the site 3.0. SCOPE OF WORK AGE proposes to collect soil samples and one groundwater sample if ground water is encountered Advanced GeoEnvironmental,Inc.