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lw e'0100 and en.mInlent,ine. 2. Site Background The United States Department of Agriculture,National Resources Conservation Service soil survey mapped the soil type at the site as Jacktone Urban Land Complex, 0 to 2 percent slopes (USDA 2008). According to the a geotechnical engineering investigation at the site by Krazan and Associates in May 2000, the site is underlain by between 4 to 14 feet of clay and silty clay material, followed by sandy silt, and then alternating horizons of silty clay, clayey silt and sand. The closest surface water is the Mormon Slough and Walker Slough, approximately 0.3 miles north and 1.1 miles south-southeast, respectively. The Stockton Deep Water Channel is located approximately 1.5 miles northwest of the site and the San Joaquin River is approximately 2.1 miles southwest of the site. No water supply or monitoring wells are located on the subject parcel. Three groundwater monitoring wells were previously located at the site and monitored throughout the year in 1999 (ATC, 1999). In the ATC reports, groundwater was encountered onsite at depths ranging from 34.08 to 36.31 feet below ground surface (bgs). Based on review of the three wells monitored on site in 1999 and of sites within a 1-mile radius of the site, groundwater flow is generally to the east-southeast and southeast. 2.4 Site History 2.4.1 Land Use According to a E&E Draft Phase I Environmental Site Assessment—Draft Phase I ESA (E & E 2010b), the only information available regarding past property use is from limited ownership search, historical topographic maps, and historic aerial photographs. Historical topographic maps from 1913 to 1952 show that the northern portion of the site was undeveloped. The fire station is observed for the first time on the 1968 topographic map. The topographic maps from 1913 to 1987 show that the southern portion of the site has never been developed with any structures. Aerial photographs from 1957 to 2005 show that the fire station and storage garage have existed on site since 1957 and that the southern portion of the site was not developed throughout this timeframe. There also appears to be a race track with an associated building in the center of the southern portion of the adjoining site to the east from 1963 through 1970. The building and track are no longer visible after the 1970 aerial photograph. The property owner for the northern parcels (APN 169-030-06 and 169-030-05) are listed as the City of Stockton with land use listed as public service. The property owner for the southern parcel (APN 169-030-13) is listed as the Redevelopment Agency of the City of Stockton, who received the deed from BCG #1 LLC, dated January 15, 2008. 2.4.2 Previous Investigations According to the E&E Draft Phase I ESA(E&E 2010), multiple letters and documents from the San Joaquin County Environmental Health Department (SJCEHD)were reviewed regarding the removal and sampling of the two former underground storage tanks (USTs)that were located on site, which are discussed individually below: 500 gallan diesel UST:A 500-gallon diesel UST, which was located approximately 10 feet east of the northeast corner of the fire station, was removed on June 28, 1993,under permit and inspection by the SJCEHD. Two soil samples were collected for analysis, one in the stockpile of 2-2