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ARCADIS According to the United States Department of Agriculture Soil Survey website, the surficial soil at the Site consists of Delhi-Urban Land Complex, with 0 to 2 percent slopes. It should be noted that ARCADIS has not drilled soil borings at the Site, and the local and regional geologic conditions described herein are based solely on available literature regarding the area. 2.3.3 Site Hydrogeologic Setting The Site is located within the San Joaquin River Hydrologic Region, which includes 9.7 million acres and all of San Joaquin County as well as surrounding counties. The San Joaquin River Hydrologic Basin is divided into nine sub-basins. The Site is located within the Eastern San Joaquin Sub-basin consisting of the following water-bearing formations: Alluvium and Modesto Riverbank Formation, Flood Basin Deposits, Laguna Formation, and Mehrten Formation(California's Groundwater, Bulletin 118; California Department of Water Resources 2003). The Hydrologic Basin is heavily dependent on groundwater with 30 percent of agriculture and urban water use from groundwater. The City of Manteca water service is provided 100 percent by groundwater. An out-of- service domestic water well is also located at the Site. Depth to first groundwater in the site vicinity is reportedly at less than 20 feet below ground surface (bgs; California Well Log Database website. No surface water is located on the Site. The nearest surface water to the Site appears to be an unnamed creek located south of the Site. 2.3.4 Site Climatological Setting The climate in the site vicinity is characterized by warm, dry summers and damp winters. The daily (24-hour) average temperature in the area is 73.8 degrees Fahrenheit (°F) in April. The average annual rainfall is 12.0 inches; most of the rainfall occurs from November through March (www.worldclimate.com). 2.4 Current and Historical Land Uses The Site has historically been used for residential purposes. However, the former owner operated a small business from his residence for repackaging chemicals for resale. Mr. Larry Gordon was identified as the site owner from approximately 1959 to 2003 (Nichols and Clean Harbors 2008). In 2003, ownership of the Site was transferred to the survivors of the Gordon Family Trust (Nichols and Clean Harbors 2008). The Site consists of several vacant, dilapidated structures some, of which, have been partially destroyed by fires of natural and unnatural causes and vandalism. Currently, dilapidated structures including a former residence are present at the Site. Empty metal storage containers, which appear to have been used for former storage of chemicals, Page 10 wp-PEA-Gordon-Juil0-RV009808.doc: