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F` ENERCON SITE ASSESSMENT WORKPLAN STOCKTON COMMERCIAL PROPERTY PHASE II ESA 4807 SOUTH AIRPORT WAY STOCKTON,CALIFORNIA 1.0 INTRODUCTION This workplan has been prepared by ENERCON Services, Inc. (ENERCON) to propose environmental assessment work at the property located at 4807 South Airport Way, in Stockton, California (subject property). The primary focus of the assessment is to perform routine environmental due diligence on the subject property. Proposed activities include a soil boring to 45 feet below ground surface (bgs) to obtain a groundwater sample. The work is being conducted on behalf on Mr. Douglas Dennis, a potential purchaser of the subject property. 2.0 SITE LOCATION AND DESCRIPTION The subject property encompasses approximately 2.92 acres and is located at 4807 South Airport Way in Stockton,California(Figure 1).The parcel is identified as Assessor's Parcel Number 177-46-019. As of September 2009,the subject property is improved with a single-story warehouse building. The subject property is located within a commercial,industrial mixed-use area.The subject property is bound to the north by vacant land,beyond which is a single-family residence;to the east by South Airport Way,beyond which is the A G Spanos Jet Center; to the south by Van De Pol Enterprises; and to the west by Coastal Pacific Food Distribution. 3.0 BACKGROUND INFORMATION From the historical information reviewed, ENERCON concluded the subject property was undeveloped land since at least 1913 and the northeast corner of the property was residentially developed and the remainder of the property was agriculturally developed sometime between 1913 and the 1950s. In the late 1960s the residence was demolished and the property was developed with the current warehouse Suite A. The current warehouse Suites B, C and D were developed in the late 1970s.Occupants of the warehouse building have been commercial businesses utilizing the warehouse for storage and light manufacturing activities. The first known use of the warehouse building was indicated in records on file with the San Joaquin County Environmental Health Department (SJCEHD)as Custom RV repair and sales shop from approximately 1970 until the mid 1990s. Two 1000 and 2000-gallon gasoline underground storage tanks (USTs) were installed in 1970 and one 12,000-gallon diesel UST was installed in 1982 on the northeast portion of the property. The USTs were associated with Custom RV and were removed from the property in 1992 under the supervision of the SJCEHD. Soil contamination was not detected in the soil samples collected from beneath the USTs or in the stockpiled soil generated during the excavation. The proposed groundwater sample was requested by Mr.Dennis in order to assess whether operations associated with above ground petroleum hydrocarbon fuel tanks at the south-adjacent property may ENMISCI745 Page 2 September 14, 2009