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PHASE II PRELIMINARY SITE ASSESSMENT WORK PLAN PROPOSED RETAIL SHOPPING CENTER INTERSECTION OF FRENCH CAMP AND MANTHEY ROADS STOCKTON, CALIFORNIA 1.0 INTRODUCTION This work plan outlines a proposed work scope to perform a Phase II Preliminary Site Assessment for the vacant property located near the intersection of French Camp and Manthey Roads in Stockton, San Joquin County, California(site). This work plan was prepared by the Environmental and Geological Services Division of The Twining Laboratories, Inc. (Twining), located in Fresno, California. Mr. David Ristau of Vestar Development Company(client)commissioned preparation of this work plan in an agreement dated October 27, 2004. The proposed work is being performed at the request of Vestar Development Company(client) in connection with an impending real estate transaction and commercial redevelopment of the site. 2.0 BACKGROUND A description of the site, the geologic and hydrologic characteristics, and the project history are summarized in the following subsections. 2.1 Site Description: The site is located in Stockton,San Joaquin County,California near the northwest intersection of French Camp and Manthey Roads,in Section 26,Township 1 North,Range 6 East,Mount Diablo Baseline and Meridian.The site elevation is approximately 15 feet above mean sea level. Drawing 1 is a site location map. This work plan addresses the field work to be conducted on the portion of the site owned by Caridad S. Dulay Family Trust assessor's parcel number 168-190-07 address 530 Henry Long Boulevard, Stockton, California. 2.2 Geologic and Hydrologic Characteristics: The following subsections summarize the geology and hydrology of the Stockton area. ti 2.2.1 Geology: The site is located within the central portion of the San Joaquin Valley. The San Joaquin Valley is part of the Great Valley Geomorphic Province,a topographic and structural basin bounded on the east by the Sierra Nevada and to the west by the Coast Range. The Siena Nevada, a fault-block dipping gently to the-southwest,is composed of igneous andmetamorphic rocks of pre- Tertiary age which comprise the basement complex beneath the valley (USGS, 1986). The subsurface of the site and surrounding vicinity is characterized by a thick sequence of Quaternary sediments. Subsurface material beneath the site is primarily composed of alluvial fan deposits and flood plain over-bank deposits including interbedded silts,sands,clays,and gravels(USGS, 1986). 2.2.2 Hydrology: The site is located within the San Joaquin Valley groundwater basin,which is part of the San Joaquin Basin Hydrologic Study Area(SJB HSA). Twenty-six groundwater basins and areas of potential groundwater storage have been identified in the SJB HSA. The SJB HSA is bound by the Sacramento-San Joaquin Delta to the north, the Sierra Nevada to the east, the Tehachapi Mountains to the south,and the Coast Range to the west. Groundwater in the vicinity of