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i [MROGEOLOGIC INVFSnOATiON E=n Company,U.S.A. Retail Store 7-3708 2705 Country Club Boulevard Stockton,California Detm Project.No.=0-9I-83S Page 2 2.0 ARTA OF iNVFSTIGATION 2.1 Site Description The subject site is an cperating retail gasoline station located on a 12 acre parcel at the northwest corner of Ryde Avenue and Country Club Boulevard in Stockton,California. Site features are shown in Figure 7- Elevation of the ground surface at the site is approximately 1 to 2 feet abe-ve mean sea level. The site slopEs -. down toward the northeast and southwest corners from a slight topographic high across the center. There are four steel,single-wail underground storage tanks at the site:one 1,000-g9llon waste oil tank,one 6,400-gallon regular gasoline tank,one 8,000-gallon premium unleaded gasoline tank,and one 10,400-gallon regular unleaded gasoline tank. 2.2 Surrounding Vicinity r The site is located in an area of residential and commercial development and is bordered by a large s apartment complex to the:north,Ryde Avenue and Interstate 5 to the east,a shopping center across Country Club Boulevard to the south,and a 7-11 market to the west. A site vicinity map is included as Figure 3. w- The region surrounding the site is relatively flat except for elevated highways and canal banks. The nearest body of surface water is Smith Canal located approximately 1,000 fet south of the site Figure 4. The Stockton Deep Water Channel and the Calaveras River are located approximately 4,500 feet from the site to the south and northwest,respectively. 2.3 Vicinity Wnter Wells There are ten water well locations within 12 mile of the subject site, according to well drillers reports provided by the California Department of Water Resources(DWR). Information regarding these wells is presented in Table 1 and well locations are shown in Figure 4. RPT002BP