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Limited Subsurface Investigation Work Plan LANDRUM PROPERTY 1747 East Charter Way, Stockton, California 1.0. INTRODUCTION At the request of Mr. Bill Landrum of Western Shower Door,Advanced GeoEnvironmental, Inc. (AGE)has prepared this Limited Subsurface Investigation Work Plan for the property at 1747 East Charter Way, Stockton,California(the site).The work is being performed as part of a due diligence for a potential property transfer. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This work plan was prepared as required by the San Joaquin County Environmental Health Department(EHD)for the procurement of a soil boring permit,and is in accordance with Appendix A to Tri-Regional Recommendations - Reporting, dated 30 August 1991; prepared by the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (UST) sites. 2.0. BACKGROUND The subject property is presently utilized for light industrial/commercial purposes.Several connected warehouse and "shop" buildings are located on the property. The southern end of the structure is utilized for office purposes.The property is bordered on the south by East Charter Way,on the north by Mormon Slough and the east and west by light industrial properties. 3.0. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the southern portion of the Great Valley Geomorphic Province of California: a large,elongate,northwest trending,asymmetric structural trough;the Sacramento and San Joaquin Valleys comprise the northern and southern portions of the Province. The Province is bordered by the Coast Ranges to the west,the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east. The Great Valley has been filled with sediments derived from both marine and continental sources. Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than 20,000 feet in the south central portion of the valley.The sedimentary formations range in age from Jurassic to Recent,with the older deposits being primarily marine in origin and the younger deposits being primarily continental. Continental-derived sediments were primarily deposited in lacustrine, fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the valley;the site itself is located on unconsolidated and semi-consolidated alluvium, lake,playa and terrace deposits of Quaternary age. Rocks composing the basement complex of the Province have not been completely defined but are believed to be metamorphic and igneous in origin. Advanced GeoEnvironmental,Inc.