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k� KLEINFELDER <br /> INITIAL SITE ASSESSMENT AND REMEDIATION WORK PLAN <br /> SAN JOAQUIN GENERAL HOSPITAL <br /> HOSPITAL ROAD WEST <br /> FRENCH CAMP, CALIFORNIA <br /> 24-220152-D00 <br /> December 17, 1992 U E C 2 1 9992 <br /> ENVIRONMENTAL HEALTH <br /> BACKGROUND PERM11 JSERVICES <br /> In September and October of 1991, Kleinfelder conducted an investigation of two tank <br /> sites (Site TI and Site T2/T3) at the San Joaquin County General Hospital complex in <br /> French Camp, California (Plates 1 and 2). A geophysical survey was conducted to <br /> evaluate the actual locations of the tanks, and a limited boring program was performed <br /> to assess the potential that the tanks may have leaked. <br /> The geophysical survey reported that the west (fill and vent) ends of tanks T2 and T3 <br /> were partially beneath the wall of the maintenance building (Plate 3) An awning <br /> extended from the maintenance building covering access to the south end of the tanks <br /> In addition, a utility tunnel was reported adjacent to the tanks to the north To collect <br /> soil samples from beneath both ends of the tanks, soil borings were angle drilled from <br /> the east side of the tanks. <br /> Soil samples submitted from the T1 tank site did not contain petroleum hydrocarbons, <br /> however, soil samples collected from beneath the west end of the T2/T3 tank site were <br /> . reported to contain petroleum hydrocarbons The results of the investigation are <br /> reported in Klemfelder's Soil Assessment Report dated December b, 1991. <br /> Based on these results and Kleinfelder's recommendations, San Joaquin County <br /> Department of Capital Projects has authorized Kleinfelder to further assess the T2/T3 <br /> tank site and remove both tanks Kleinfelder currently assumes that soil remediation <br /> will be accomplished by over-excavation during the tank removal. For continuity, the <br /> tanks will retain their original designations (T2/T3) <br /> APPROACH <br /> Kleinfelder recommends drilling of one soil sampling boring and installing three <br /> monitoring wells Because petroleum hydrocarbons were detected beneath the west end <br /> of the tanks, one boring is proposed on the west side of the tanks to assess the vertical <br /> extent of migration <br /> Based on the reported seasonal high water depth of 18 feet, there is a potential that <br /> ground water has been impacted The proposed monitoring wells will be triangulated <br /> around the tanks to make an initial assessment of the extent of impact to ground water <br /> and to evaluate the ground water gradient <br /> FWP2-92-25 Page 1 of 4 24-220152-DOO <br /> Copynght 1992 Klemfelder, Inc <br />