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5.0 HISTORICAL USE INFORMATION The following is a list of historical Site use information sources reviewed during the original Phase I ESA. Aerial Photographs - CAC acquired and reviewed aerial photographs from Environmental Data Resources, Inc. (EDR). EDR provided photographs from 1937, 1940, 1957, 1963, 1968, 1975, 1982, 1993, 2006, 2009, 2012 and 2016. Copies of the aerial photographs are included in Appendix B. Sanborn Fire Insurance Maps- CAC requested Sanborn Fire Insurance Maps from EDR covering the Site and nearby areas. Sanborn Fire Insurance Maps were not available for the Site vicinity. City Directories - City Directories were available for the Site vicinity and the information is summarized below. USGS Topographic Map - CAC acquired and reviewed the historic topographic maps of the Lathrop, Ripon, Vernalis and Manteca, California Quadrangles (7.5 -minute) for the years 1914, 1915, 1952, 1968, 1969, 1976, 1980, 1987, 1991, 1994, 1996, 2012, 20015 and 20018. Building Department - CAC interviewed personnel at the City of Manteca and San Joaquin County Building and Planning Departments regarding records for the Site. Fire Department - CAC interviewed personnel regarding past hazardous materials use/storage at the Site at the San Joaquin County Environmental Health Department. Other Sources - CAC interviewed Ms. Joanne Kimbrough (representative of the current Site ownership) and Mr. Steve Miller of Signature. 5.1 SUMMARY OF PRIOR USES — THE SITE Pre 1914-1968 Based on a review of historic maps from 1914 and aerial photographs from as early as 1937, the Site has been vacant and/or used for agricultural production. The irrigation ditch running through the Site and pump were observed as early as 1940. The residential structures as well as a larger structure (possibly a barn) were identified in the northeast corner of the Site as early as 1937. 5-3