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Surface and Subsurface Contamination Report Page 8 <br /> VELASQUEZ PROPERTY September 5,2008 <br /> ' WKA No.8237.01 <br /> 4.2.2 Topographic Maps <br /> 1 <br /> Historical USGS topographic maps with coverage of the site and outlying land areas were <br /> ' reviewed. Topographic maps of the Mariposa Lakes and Stockton East, California Quadrangles <br /> for years 1914, 1952, 1968, 1976, and 1987 were available for review from WKA's in-house <br /> ' library. The maps are discussed below. The 1987 topographic map has been adapted to serve as <br /> Figure 2 of this report. <br /> ' 1914 <br /> Scale: 1:31,680 <br /> The site is as part of a larger vacant land area. Elmwood School is mapped approximately <br /> ' 4,000 feet northeast of the site. East Main Street is mapped but not labeled. <br /> 1952, 1968, 1976, and 1987 <br /> Scale: 1:62,500 and 1:24,000 <br /> ' The site is mapped with USGS omission tinting on all of the reviewed maps. The tinting was used <br /> in areas that contained dense structural development. East Main Street is labeled as such. <br /> ' 4.2.3 California Oil/Gas Well Maps <br /> ' Review of California Department of Conservation, Division of Oil, Gas, and Geothermal / <br /> Resources(DOGGR) Map 606, dated June 20, 2002, showed that the site is not located in a (3 s A6 <br /> designated natural gas field. No DOGGR wells are located on or within at least one-mile of the site <br /> (DOGGR, 2007). <br /> ' 4.2.4 Aerial Photographs <br /> ' Historical aerial photographs of the site and general vicinity covering the years 1957, 1963, 1970, <br /> 1982, 1993, 1998, 2002, and 2005 were compiled by EDR®(EDR®, 2008c). The results of the <br /> ' review are discussed below by year. Copies of the aerial photographs provided through EDRF are <br /> included on the CD attached to the back cover of this report. <br /> 1 <br />