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Expanded Phase II Site Assessment Work Plan BIER PROPERTIES 1881 East Main Street et al. , Stockton, California 1.0. INTRODUCTION At the request of Mr. Wayne Bier, Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Expanded Phase II Site Assessment Work Plan for the property located on eighteen parcels on Main Street between Market Street and Wilson Way in Stockton, California (the site). The work is being performed as part of a due diligence for a property transfer. The site setting 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 soil boring permits, and is in accordance with Appendix A-Tri-Regional Recommendations - Reporting prepared by the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (UST) sites. 2.0. BACKGROUND The site is located at 1523-1617 East Main Street, 1881 East Market Street, 1904-1936 East Weber Avenue and four vacant parcels with no address, all located in Stockton, California. The property consists of eighteen parcels totaling approximately 18 acres; APNs 153-040-03 and 153-040-09 have existing commercial structures, APN 153-040-10 includes a small office building and APNs 153- 040-11, 153-040-12, 153-040-13, 153-040-14, 153-040-15 are vacant land utilized by a tow yard, and APNs 153-090-01, 153-090-02, 153-090-03, 153-090-04, 153-090-05, 153-090-06, 153-090-07, 153-090-61 and 153-090-62 are vacant land and 153-090-58 is abandoned roadways (East Weber and A Street). The prominent features on the subject property are depicted in Figure 2. 2.1. 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 northern and southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, respectively. 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 Advanced GeoEnvironmental, Inc.