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Surface&Subsurface Contamination Report Page 11 Sandhu Farms Project No. 655.1 August 16, 2012 Hydrology Evaluation of the site's geologic and hydrologic conditions included a review of the surface soils and topography, a review of groundwater monitoring reports for nearby known contamination sites, a review of the USGS Topographic Map, Vernalis Quadrangle and the map Lines of Equal Depth in Water Wells, which is attached to Geology of Fresh Groundwater Basin, Central Valley, California. USGS Professional Paper 1401-C. 1986. Based on this map the surface of groundwater is estimated to he less about 10 feet below grade and flows in a northeasterly direction. Groundwater monitoring data from a remedial investigation at the Tracy Defense Depot about 1 mile west of the Property suggest that locally, groundwater lies at about 13 feet below grade and flows in a north easterly direction. The nearest open body of water is the San Joaquin River, about 2 miles to the east. A Banta Carbona Irrigation ditch forms the south boundary of the Property. According to maps in the EDR report, much of the Property does not lie within a 100-year flood zone. In much of the Central Valley, the shallow groundwater contains marginally potable water, and generally the only water production wells completed opposite this zone are domestic wells. The shallow aquifer is composed of shallow sand, and silt alluvium deposited on the valley floor. Hotchkiss & Balding, in their 1971 US Geological Survey report, Geology Hydrology. and Water Quality of the Tracy-Dos Palos Area San Joaquin Valley California (Open File Report 72- 169) described the aquifers and their characteristics for the Tracy-Dos Palos area. In the Vernalis-New Jerusalem area, the recent alluvium is generally less than 100 feet thick and directly overlies the Tulare Formation, a Plio-Pleistocene age, mixed clastic sequence of clay, silt, sand and gravel. There is little to distinguish the contact between the base of the alluvium from the top of the Tulare Formation Petroleum Production Based on oil and gas production maps produced by the California Division of Oil, Gas and Geothermal Resources, the Vernalis Gas Field lies about 1 mile southeast of the Property. Several step-out exploratory gas wells were drilled near the Property and one was on the Property, but all were abandoned as dry holes. The Vernalis field produces natural gas from a depth of about 5000 feet from the Cretaceous age Panoche Formation. 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone: (209)569.0293 Modesto, CA 95356 Fax: (209)569-0295