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Z Site Background 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. Groundwater was encountered on site at a depth of 39 feet below ground surface(bgs)in May 2000 (Krazan,2000). Based on review of sites within a 1-mile radius of the site, groundwater flow is generally to the southeast and east. 2.4 Site History According to the E&E Phase I ESA(E&E 2010),the subject property has been primarily vacant land with no history of development. Historical aerial photographs show an apparent race track with an associated building on the property between 1963 and 1970. A concrete slab on the site may be a remnant of the foundation of this building.The lien search indicated that the Redevelopment Agency of the City of Stockton was the grantee of a grant deed from the United States Postal Service(USPS) for the subject property(APN# 169-020-11)dated February 13, 2003. 2.4.1 Current Uses The property is currently vacant pending redevelopment. 2.4.2 Previous Investigations on the Subject Property Previous site investigations include Krazan&Associates Geotechnical Engineering Investigation,2000; Lowney Associates Soil Quality Evaluation, 2000; URS Phase I Environmental Site Assessment,2000; and E&E Phase I Environmental Site Assessment,2010. Geotechnical Engineering Investigation, 2000,Krazan & Associates,Inc. In 2000,Krazan&Associates conducted a geotechnical engineering investigation at the subject property for the USPS. Four borings were drilled at the subject property to depths from 10 to 50 feet bgs. The borings encountered alternating layers of silty sands, clayey silts, and silty clays at various depths below the subject property. No environmental samples were collected. Groundwater was encountered in one boring at approximately 39 feet bgs. Soil Quality Evaluation,2000,Lowney Associates In 2000, Lowney Associates conducted a soil investigation at the subject property in which eight soil borings were advanced to depths of 15 feet bgs throughout the site. Soil samples were collected from each boring at depths ranging from 10 feet to 15 feet bgs,and from approximately 5 feet bgs at three locations. All 19 soil samples were analyzed for Total Petroleum Hydrocarbons(TPH) as Gasoline(TPH-g), Diesel(TPH-d),and Motor Oil(TPH-mo);benzene, toluene, ethylbenzene,and xylenes(BTEX); and volatile organic compounds(VOCs). Laboratory analysis of the soil samples collected from the exploratory borings did not detect TPH-g,TPH-mo, BTEX compounds,or VOCs at concentrations above the laboratory reporting limits. One soil sample from 10 feet bgs in boring B-1,located in the northeast portion of the site, detected concentrations of TPH-d at 1.3 parts per million. The low level of diesel range I4902693.1401.01BR 2-2 El Co.M.No.l