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I( LEINEELDER 2 BACKGROUND This report summarizes Kleinfelder's petroleum hydrocarbon soil assessment and remediation of three underground gasoline storage tanks (UST) at the San Joaquin County General Hospital site at 500 Hospital Road in French Camp, California (Plate 1, Site Location Map) The USTs were located at two sites within the hospital complex (Plate 2, Underground Tank Location Map). Site #1 had a 6,000 gallon UST (T1). Although there was no written record of the tank's installation date, it is believed that T1 may have been installed during the 1940's T1 was reported to have contained unleaded gasoline, but because of its age, it is possible that it contained leaded gasoline at one time. After failing a precision tank test, the T1 site was assessed and T1 removed The initial soil investigation results are presented in Kleinfelder's Soil Assessment Report dated December 6, 1991 A copy of Kleinfelder's Assessment Report for the T1 site is included in Appendix A Kleinfelder did not recommend additional assessment or remediation of the T1 site Site #2 had two 750 gallon USTs (T2, T3). Tank T2 was originally thought to be the only tank at this site; however, tank T3 was found immediately adjacent to T2 during a geophysical survey. Both tanks are thought to have contained gasoline at one time, but have not been filled in at least 25 years. The T2/T3 site was initially assessed in October of 1991 The initial soil assessment results are presented in Kleinfelder's Soil Assessment Report dated December 6, 1991. Based on the results of the initial assessment, the San Joaquin County Department of Capital Projects requested further assessment and remediation of the T2/T3 site ' This report summarizes the additional assessment and remediation work, and presents the data and Kleinfelder's conclusions and recommendations based on that data ' Jul 27 1993 24_220152-D00/�R12-105 (1993) Page 3 of 18 y , copyright 1993 uteinfetder, Inc