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PRELIMINARY SITE CHARACTERIZATION ' 315 SOUTH CENTER STREET AND 37 WEST SONORA STREET STOCKTON, CALIFORNIA 1.0 INTRODUCTION IThis report is for a preliminary characterization of the property at 315 South Center Street and 37 West Sonora Street(site) in Stockton, California. The purpose of the preliminary characterization is to investigate the possibility that Halogenated Volatile Organic Constituants (HVOCs) may be present in sub-surface soil near the former and current location of two dry cleaner facilities (dry cleaners). ' This work plan was commissioned by Mr. Chris Cammack of CL Properties, VI (client) in an agreement(C-199-195)dated December 3, 1999. The IBPOE of W.Lodge 1016(P.O.Box 691985, Stockton, California 95212) owns both parcels . ' This work plan was prepared by The Twining Laboratories, Inc. (Twining), Environmental and Geological Services Division. This work is not being carried out to meet the requirements of any regulatory agency. The work is being carried out to provide data for a property transaction. 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 (Assessor's parcel numberl37-31-10 and 137-31-16) is west of South Center Street, and west of East Sonora Street. The site is currently vacant. The site elevation is approximately 14 feet above mean sea level(MSL). Drawing 1 is a site location map and Drawing 2 is a site plan. 2.2 Geologic and Hydrologic Characteristics: The following subsections summarize the geology and hydrology of the Stockton area. ' 2.2.1 Geolou: The site is in the central portion of the San Joaquin Valley within the central portion of the Great Valley geomorphic province of California. The Great Valley is a nearly flat northwest to southeast trending structural basin approximately 450 miles long by 50 miles wide. The Great Valley has been filled with a sequence of older to younger alluvium of Pliocene to Holocene age which overlie sedimentary rocks of Cretaceous to Tertiary age. These sedimentary units, in turn, overlie a crystalline basement of Paleozoic and Mesozoic metamorphic and igneous 1 rocks. The shallow subsurface geology in the site vicinity is a heterogeneous mix of gravel, sand, silt, and clay(Hackel, 1966). 2.2.2 Hydrology: First-encountered groundwater in the site vicinity occurs under unconfined ' (water table) conditions at a depth of approximately 25 feet below site grade (BSG) (California Department of Water Resources, 1998). Sediments containing fresh groundwater are largely unconsolidated silts and sands which were derived from river channel, flood plain, and alluvial fan deposits of Pliocene to Recent age(Davis