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tay.� � -fir', a� Fk4t• k �� ,�{ Pn d +, r• <br /> t' <br /> Wiggins & Associates, Stockton, California / Project 309101 July 31, 1991 <br /> 7) Write a technical report that describes the field work and <br /> presents the results of the investigation. <br /> REVIEW OF HISTORIC AERIAL PHOTOS AND REVIEW OF SJCPHS FILES <br /> ka <br /> On April 26, 1991, TMC reviewed available historic aerial <br /> photographs of the subject site and site vicinity. Photo research <br /> was performed at Pacific Aerial Survey (PAS) , located in Oakland, <br /> (B California. Three black and white photos of the site and vicinity <br /> were available at the PAS library. The 1966 photo revealed that <br /> the site and vicinity were primarily used for agriculture or were <br /> non-developed. The 1985 photo reveal that the site and vicinity <br /> are similar to currently existing conditions. <br /> On May 29, 1991, TMC reviewed available environmentally-related <br /> files at the SJCPHS. Information in theso files reveal that the <br /> ell capacities.tanks at the site each have 12,000-gallon capacities. Two <br /> tanks formerly contained gasoline motor fuel, and one tank <br /> contained diesel fuel. There was no indication in these files of <br /> other tanks existing at the site. <br /> An Unauthorized Discharge Report for the site was found in the <br /> SJCPHS files. It revealed that in May, 1987, one of the gasoline <br /> tanks and the diesel tank failed a tank precision tank test. <br /> Documentation also reveals the diesel tank again failed a precision <br /> tank test in November 16 1989, <br /> , Quantities of fuer materials <br /> discharged is not indicated in these files. <br /> TMC also reviewed the SJCPHS's Underground Tank Program - UAR site <br /> List, revised March 4, 1991. Information in this file revealed <br /> seven sites, in the vicinity of the subject site, that failed tank <br /> precision tests and/or had unauthorized fuel discharges to the <br /> fi <br /> e� <br /> TMC Environmental, .Inc. / San Pablo, California 3 of 12 <br />