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SITE INVESTIGATION WORK PLAN <br /> October 1996 <br /> Marquardt Transportation <br /> 1340 W. Charter Way <br /> Stockton, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Ms. Heidi Scherr of Scudder Law Firm, Advanced <br /> GeoEnvironmental, Inc. (AGE) has prepared this Site Investigation Work Plan for the collection of <br /> soil samples at 1340 W. Charter Way, Stockton, California. The scope of work includes the <br /> advancement of two soil probe borings near the former underground storage tank(UST) excavations <br /> and collection of soil samples. The location of the site is illustrated in Figure 1 -Location Map. A <br /> plan of the site is illustrated on Figure 2 - Site Plan. <br /> This Work Plan is prepared in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) guidelines for the investigation of UST sites. <br /> 2.0. BACKGROUND <br /> 2.1. SITE LOCATION AND DESCRIPTION <br /> It is our understanding that one (1) 2,000-gallon gasoline underground storage tank (UST) and one <br /> (1) 1,000-gallon waste oil tank UST were excavated and removed from the site in November 1989. <br /> Soil samples collected beneath the tank did not detect any petroleum hydrocarbon constituents. <br /> 2.2. REGIONAL GEOLOGIC SETTING <br /> The subject site is located in the eastern portion of the Great Valley geomorphic province of <br /> California. The valley is a nearly flat, elongate trough trending northwest and southeast for <br /> approximately 450 miles. The valley is enclosed by the igneous Sierra Nevada to the east and the <br /> sedimentary and metamorphic Coast Ranges to the west. The surficial and upper several hundred feet <br /> of subsurface layers consists of a great thickness of predominantly unconsolidated alluvial and <br /> floodplain deposits(dominantly sands, silts, and clays) of Quaternary age, which are derived from the <br /> predominantly granitic mountains of the Sierra Nevada. Beneath the upper sedimentary deposits lie <br /> a thick sequence of marine deposits of Mesozoic age. These units are further underlain by a pre- <br /> Jurassic complex of igneous and metamorphic basement rock. <br />