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PRELIMINARY SUBSURFACE INVESTIGATION WORK PLAN INDUSTRIAL PROPERTY 248 INDUSTRIAL DRIVE STOCKTON, CALIFORNIA 95206 1.0 INTRODUCTION The subject property consists of an approximately 5-acre parcel of land, occupied by an approximately 50,000-square-foot single-story industrial building, and a 1,500-square-foot single-story office structure. The subject buildings were vacant during the site visit, but most recently were occupied by NICA Metals, a materials recycling business. The property is now in the hands of a Receiver, Mr. Stephen Donell, who is acting as owner of the property. The scope of Work Plan for this preliminary subsurface investigation is based on information gathered during a July 23, 2010 Phase I ESA completed by Pinnacle Environmental, Inc. (PEI) for the subject property. That report concluded the subject property was used as a large (apparent) agricultural products warehouse from approximately 1960 to the early 1980s. It was then occupied by a roofing manufacturer until 2007 and a metal recycling business through 2010. Significant portions of the property have been altered and/or improved from their earlier states, including various generations of paving, alterations and additions to the main building, removal of equipment and ASTs, alterations to stormdrain systems, etc. Due to the potential change in ownership of the subject property, Pinnacle Environmental, Inc. (PEI) has been requested to perform a due-diligence assessment. As required by the city of Stockton and San Joaquin County Department of Environmental Health, PEI is pleased to present this workplan for limited subsurface assessment. 2.0 SITE DESCRIPTION The subject property consists of an approximately 5-acre parcel of land, occupied by an approximately 50,000-square-foot single-story industrial building, and a 1,500-square-foot single-story office structure. The subject buildings were vacant during the site visit, but most recently were occupied by NICA Metals, a materials recycling business. The subject property is located on south side of Industrial Drive approximately 500 feet east of McKinley Avenue, within an industrial area. It is identified by the San Joaquin County Assessor as Parcel Number 177-280-20. The relevant portion of the Stockton West, California topographic map is excerpted and shown as Figure 1 of this work plan. Figure 2 is a site plan which shows the approximate locations of structures on the property, the approximate locations of the property boundaries, and adjoining structures. Subsurface utilities (e.g., sewer lines, electrical, water, and stormwater drains) will be identified prior to subsurface work using a private utility location contractor (discussed in Section 3.1). Remediation Pilot Study Workplan Pinnacle Environmental,Inc. 248 Industrial Drive,Stockton,CA Page 3