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25 November 2015 AGE Project No. 15-3594 Page 6 of 26 3 . 0. RECORDS REVIEW The purpose of obtaining and reviewing subject property and site vicinity historical , physical setting , and regulatory records is to help identify recognized environmental conditions in connection with the subject property. 3 . 1 . HISTORICAL USE INFORMATION The objective of consulting historical sources for a Phase I is to develop a history of previous uses of the property and surrounding area to help identify the likelihood of past uses having led to recognized environmental conditions with respect to the property. All obvious uses shall be identified from the present to the property's first obvious developed use , or back to 1940 , whichever is earlier. Review of standard sources at less than five year intervals is not required . 3 . 1 . 1 . Historical Use Information on Subject Property Subject property history was researched by reviewing historical Sanborn Fire Insurance Maps (no coverage) , aerial photographs , topographic maps , telephone directory information , San Joaquin County Assessor's Office records and the San Joaquin County Community Development Department records . Based on a review of historical documents , the subject property was utilized agriculturally from at least the late 1930s to the early 1990s . By the late 1990s the property was developed with the existing trucking terminal and maintenance facility . In summary , review of the historical documents revealed no features on the subject property of environmental concern . Representative historical records are provided within Appendix B . 3 . 1 . 1 . 1 , Sanborn Fire Insurance Maps Sanborn Fire Insurance maps were developed in the late 1800s and early 1900s for use as an assessment tool for fire insurance rates in urbanized areas but are now utilized as a valuable source of historical and environmental risk information . EDR owns the largest collection of Sanborn Fire Insurance Maps . AGE requested EDR to provide any Sanborn Fire Insurance Maps that might cover the subject property. Sanborn Fire Insurance Map coverage is not available for the subject property. 3 . 1 . 1 .2 . Aerial Photographs AGE reviewed aerial photographs of the subject property and surrounding area that were provided by EDR for the years 1937 , 1940 , 1957 , 1963 , 1968 , 1975 , 1982 , 1993 , Advanced GeoEnvironmental, Inc.