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Dama, Inc. March 31, 2004 B94301.01 Page 7 Other Physical Evidence of Contamination Indications of contamination in the form of stained soil was observed on the Site the day of the Site ` reconnaissance. An oily staining of the soil was observed within the on-Site garages/workshops located on the northeastern portion of the1301 W. Joan Avenue property. The staining does not appear to be major and no specific area was identified that appeared to be used for dumpier. 4.0 HISTORICAL INFORMATION OF THE SITE AND ADJOINING PROPERTIES. The history of land-use on and near the Site was determined from interviews, review of historic aerial photographs and topographic and Sanborn maps, building permits, and historic city directories. 4.1 Aerial Photograph Review Available historical aerial photographs ofthe Site and vicinity for the years 1937, 1952, 1974, 1981, 1987,and 1996 were reviewed for indications of past use and/or activities which may have involved the manufacture, generation, use, storage, and/or disposal of hazardous materials. The aerial photographs were reviewed at the San Joaquin County Engineering and Planning Department on Wednesday,March 17, 2004. • The 1937 aerial photograph depicts the Site and adjoiningproperties as agriculturally developed. • The 1952, 1974, 1981, 1987, and 1996 aerial photographs depict the Site as residentially developed with what appears to be the same residential structures observed at 1301 W. Joan Avenue during the Site reconnaissance. Adjacent properties to the west and south are residentially developed by 1952, and properties beyond Hammer Lane to the north are residentially developed in the 1974 photograph as is the church to the east of the Site. .. 4.2 Sanborn Fire Insurance Map Review Twining reviewed Sanborn Fire Insurance Maps online at htip:Hsanbom.umi.com,sponsored by Bell & Howell UMI. Sanborn Maps can provide historical information regarding a site. Available Sanborn Fire Insurance Maps drawn for the city of Stockton do not cover the area of the Site. 4.3 Historical City Directory Review City directories published by R.L.Polk Company(Polk)were reviewed at the San Joaquin County ` Library, located in Stockton, California. City directories can provide information concerning past and current occupancy of the Site. The city directories reviewed indicated the property at 1301 W. Joan Avenue was occupied with a residence as early as 1950 and continuing to the present. The