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' 0 December 5, 2005 NOA Project Number: E05132C 1.1 Site History ' According to information discovered during the production of the Phase I,' the Site has been owned by the Caffese family for approximately 45 years. The property was used prior to 1980 for growing ' row crops;irrigation water was provided by a pipe which ran under Main Street from a property to the south. After the pipe was disconnected around 1975 or 1980, the Site could only be used for dry farming crops such as oats. The residence on the Site was constructed around 1979. Parcel 159-100-07 of the Site and the adjacent parcel to the east share the address of 5050 East Main Street. A listing for this address was found in the UST HIST database of historical underground storage tanks. According to the listing,Victor Rolleri, former owner of the Site,installed a 550- gallon regular gasoline underground storage tank at that address in 1957. No further information was provided. Mr. Caffese spoke to Victor Rolleri regarding the tank. Mr. Rolleri told him that he ' had stopped putting fuel in the tank in 1984 and that he removed the tank approximately five years ago. Mr. Rolleri described the approximate location of the former tank to Mr. Caffese;Mr. Caffese met NOA at the property on October 24, 2005 and indicated this location as a soil depression just east of the eastern property line of the subject property. 1.2 Soil ' According to the Soil Survey of San Joaquin County, California'2 the subject property is located on soils identified as Galt clay, 0 to 2 percent slopes,with small areas of Galt-Urban land complex, 0 to 2 ' percent slopes, and San Joaquin-Urban land complex, 0 to 2 percent slopes. The Soil Survey describes these map units as follows: ' Galt clay, 0 to 2 percent slopes—This moderately well drained, nearly level soil is on basin rims and in basins. It is moderately deep to a hardpan. It formed in alluvium derived from mixed rock sources. A few areas are dissected by intermittent sloughs that have been filled as a result of land ' leveling... Typically, the surface layer is grayish brown and dark grayish brown clay about 25 inches thick. The upper 9 inches of the subsoil is dark grayish brown clay. The lower part to a depth of 60 inches is a variegated/ightyellowisb brown, dark grayish brown, and white, weakly cemented ' hardpan. In some areas the surface layer is silly clay... Permeability is slow in the Galt soil... Runoff is slow, and the baZard of water erosion is slight. The soil is subject to ran flooding, which occurs duringyears of abnormally bigb precipitation. ' Galt-Urban land complex, 0 to 2 percent slopes—This nearly level map unit is on basin rims and in basins... This unit is 50 percent Galt clay and 35 percent Urban land... Urban land consists of 1Neil O.Anderson&Associates,Inc.,2005,Phase I Environmental Site Assessment,Ligurian Village Subdivision,E05132B. 2USDA Soil Conservation Service, 1992,Soil Survey of San Joaquin County,California. ' 2 "'44