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Site Background Information
<br /> Former Surface Impoundment Area
<br /> CHEROKEE TRUCK STOP
<br /> 3535 East Cherokee Road, Stockton, California
<br /> The former Delta Truck, Inc., nee Delta White, is currently owned by Cecchini, Cecchini, and
<br /> Giovannoni, a small family-owned, real estate holding company, which received the property
<br /> through foreclosure in July 1992. The property address is given as 3535 East Cherokee Lane,
<br /> Stockton,California;the location is approximately 300 feet northeast ofthe intersection ofCherokee
<br /> Road and Newton Road,near the eastern portion of Stockton, California.
<br /> GEOLOGIC/HYDROGEOLOGIC SETTING
<br /> The Geologic Map of California,published in 1966 by the California Department of Conservation
<br /> Division ofMines and Geology,shows the site area within the Great Valley Syncline(GVS),a large,
<br /> elongate, northwest trending structural trough. The GVS is subdivided into two major divisions
<br /> designated the Sacramento and San Joaquin Valleys,which have been filled to the present elevation
<br /> with thick sequences of sediment ranging in age from Jurassic to present day, creating a nearly
<br /> flat-lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath
<br /> Mountains in the north. The western and eastern boundaries of this province are comprised of the
<br /> California Coast Range and the Sierra Nevada, respectively.
<br /> Geologically,the area around the site generally consists of Holocene-aged flood-basin deposits of
<br /> clay, silt, and sand. Miocene to Holocene age- units are located in the surrounding area. These
<br /> deposits are heterogeneous mix of generally poorly sorted clay,silt,sand,and gravel with some beds
<br /> of claystone, siltstone, sandstone, and conglomerate(Page, 1986). Most of the fresh ground water
<br /> in the Central Valley is contained in the post-Eocene-aged continental rocks and deposits and in the
<br /> Holocene-aged river deposits consisting of gravel,sand,silt,and minor amounts of clay.In general,
<br /> these geologic materials comprise a major widespread aquifer extending hundreds of feet deep and
<br /> occasionally containing individual confining layers. Boring logs of ground water monitoring wells
<br /> SI-1, SI-2, and SI-3, located around the former excavation, indicate that the upper 100 feet of soil
<br /> at the site is generally described as silty clay to clayey silt. Below a depth of 50 feet, silty sand to
<br /> sand units are interbedded with the silty clay;these sandier zones are up to 10 feet in thickness.The
<br /> total depth of subsurface investigation at the site was 100 feet below ground surface.
<br /> The Modesto,Riverbank,Turlock Lake Formations and overlying recent alluvium are the principal
<br /> source of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin
<br /> (Basin 5-22). This basin is drained primarily by the San Joaquin River, which is approximately
<br /> 10 miles west of the site. The nearest surface water features in the vicinity of the property are the
<br /> Stockton Diverting Canal,located approximately 2,500 feet southwest of the site and the Calaveras
<br /> River, located approximately one mile north of the site.
<br /> Advanced GeoEnvironmental,Inc.
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