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. 3 Resurfacing activities utilizing the stockpiled soil as base material were performed in <br /> December 1990 Soil was blended with the gravel base rock, spread in a single lift on the <br /> ground, topped with road oil, and rolled to create an asphalt-like surface <br /> 5.0 WASTEWATER LINE INVESTIGATION AND CLOSURE <br /> 1 The abandoned wastewater line,which connected the track pans and the inspection pit at the <br /> former fueling facility with the former wastewater tank,was left in place at the time of tank <br /> removal activities in November 1990 Site plans called for the installation of an oil/water <br /> separator in the same area as the line, and the line was left in place until its potential future use <br /> could be determined However, after future site plans changed and installation of an oiUwater <br /> separator was no longer required, reuse of the line was not required <br /> 2 During tank removal activities, the line was pressure tested to detect potential leaks The line <br /> passed the initial integrity testing at a pressure of 2 pounds per square inch (psi), but failed at <br /> 5 psi pressure required by San Joaquin County Additional testing and/or sampling was <br /> recommended to determine proper abandonment procedures <br /> • <br /> 5.1 WASTEWATER LINE INVESTIGATION <br /> 1 The precise location of the wastewater line was determined on January 9, 1992 Since the line <br /> was constructed of polyvinyl chloride (PVC) pipe, a metal plumber's snake was inserted <br /> through the line and a signal generator was placed on the snake The wastewater line was then <br /> traced using a pipe locator The line was found to be a total of 359 feet in length, and ranged <br /> from a depth of approximately 4 feet at the east end to approximately 10 feet at the west end <br /> 2 The Workplan far Investigation and Closure of Remaining Fill Line was submitted to <br /> Ms Diane Hinson at San Joaquin County on May 11, 1992, outlining the use of a tracer <br /> gas method for locating potential leaks in the wastewater line A copy of this Workplan <br /> is included in Appendix E The proposed approach was modified per discussions with <br /> Ms Hinson such that integrity of the line would be evaluated by collecting soil samples <br /> from below the line by hand sampling <br /> 3 Field activities were performed during the period of April 7 through April 9, 1993 Eighteen <br /> soil borings (BH-1 through BH-18) were drilled by hand to approximately 1 to 2 feet below <br /> the bottom of the wastewater line at approximately 20-foot intervals along the length of the line <br /> 10 <br /> ENVIRONMENTAL SOLUTIONS <br />