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2 Site Background 2.1 Location The El Concilio#2 site is located at 1116 East 1st Street in Stockton, San Joaquin County, California.This assessment focuses on APN 169-030-05, 169-030-06,and 169-030-13, with a total recorded acreage of approximately 1.98 acres.The geographic coordinates for the approximate center of the area of concern are 37'56' 22.32"north latitude, 121' 16' 18.00"west longitude. Figure 1 shows the location of the property. Figure 2 shows the El Concilio No. 2 site and features at the subject property, including the parcel boundaries. Figure 3 is a site detail map showing previous sample locations. Figures are contained in Appendix A. 2.2 Site Description The subject site is designated by three APNs,with the northern two parcels being developed with a fire house, storage garage,parking areas, and a firefighting training structure while the southern parcel consists of an undeveloped,open field. The entire site is approximately 200 feet (ft)by 430 ft or 1.98 acres(86,100 square ft)and is designated for commercial land use. The property is bordered by 2nd Street to the south, an undeveloped field followed by South Airport Way to the east, East I" Street to the north,and to the west by South Union Street. The general neighborhood surrounding the site is mixed use residential and commercial properties. The city of Stockton is located along the San Joaquin Delta waterway,connecting the San Francisco Bay and the Sacramento and San Joaquin Rivers. The site is located approximately 2 miles east of the San Joaquin River and Deep Water Ship Canal and is approximately 20 feet above mean sea level. The site is relatively flat and at grade with the surrounding streets and properties The climate for Stockton is temperate. The average mean temperature is 63 degrees Fahrenheit. The annual mean precipitation is 13.95 inches. 2.3 Topographic and Geologic Information According to the Stockton West U.S. Geological Survey 7.5-minute quadrangle, 1987,the elevation of the ground surface at the subject property is approximately 20 feet above sea level. Topography at the site and surrounding properties is relatively flat. Regional topography slopes in a westerly and southerly direction. Storm water runoff appears to pond on site in the vegetated and bare soil areas throughout the site. Discussion of the geology at the El Concilio No. 2 site and the surrounding area is based on the "Preliminary Environmental Assessment Report, Merlo I.E.T. School Additional Earth Technologies, Inc. (Condor 2007). The subject area is located in the Great Valley Geomorphic Province,which consists of the Sacramento Valley to the north and the San Joaquin Valley to the south. The site is situated in the northern portion of the San Joaquin Valley. The Great Valley Geomorphic Province is a northwest trending, structural depression, filled with up to six vertical miles of lithified marine and non-marine sediments. Regionally,the lithology of the upper 3,000 002693.I501.OIBR 2-1 BI C=W.N.2