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ARCADIS representatives, the Gordon Family Trust, began removing all unlabeled containers, high-pressure cylinders, and debris. A fence was constructed around the Site. The Gordon Family Trust was unable to finish the required activities in 2009 so the DTSC through an emergency response obtained the necessary funds to complete removal action. On July 6, 2009, the DTSC issued a Notice of Final Determination of Non-Compliance to the Gordon Family Trust resulting in the reclassification of the Site to "Orphan" thereby making available funding necessary to complete the PEA. In October 2009, the DTSC conducted weed abatement in response to a Cease and Abatement Order issued by the Manteca Fire Department. 2.3 Physical and Environmental Characteristics The information presented in the following subsections is derived from referenced documents and independent confirmation and research conducted by ARCADIS. 2.3.1 Site Topography The Site is at an elevation of approximately 43 feet above mean sea level according to information obtained from Google Earth. Based on information obtained from the United States Geological Survey Topographic Map of Manteca, California 7.5-minute Quadrangle dated 1952, photo revised in 1987 and 1994, the surface of the Site is generally flat. An intermittent stream is mapped south of the Site. The site location is shown on Figure 1. 2.3.2 Site Geology and Soil Types The Site is located within the Great Valley Geomorphic Province, an alluvial plain about 50 miles wide and 400 miles long in the central part of California. The Great Valley is an asymmetrical synclinal trough with its axis off-center to the west. Sediments have been deposited in this trough almost continuously since the Jurassic period (about 160 million years ago). Lithology beneath the Great Valley is composed of alluvial sediments known as the Great Valley Sequence, comprised of interbedded sedimentary units. These sedimentary units are composed primarily of eroded rock from the Sierra Nevada Mountains. The syncline was previously underwater; therefore, some of the sediments are of marine origin. The thickness of the Great Valley Sequence exceeds 25,000 feet in some areas. The lowland of the Great Valley is referred to the Central Valley consisting of the northern Sacramento Valley and the southern San Joaquin Valley. The Site lies within the San Joaquin Valley. Generally, near-surface lithology in the Central Valley is comprised of unconsolidated Pleistocene and recent sediments (Norris & Webb 1976). wp-PEA-Gordon-Jul10-RV009808.doc: Page 9