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r <br /> of reducing the amount of contamination to background based upon the highest recorded water <br /> elevation at the site which is 33 feet below ground surface. <br /> Levels of contamination may have changed since the excavation was closed in 1990. Additional 1 <br /> borings to assess any changes in the subsurface conditions may be indicated at this time. Borings <br /> should be planned so they can be completed as part of a potential remediation system. <br /> In addition, there appears to be no monitoring well in close proximity down gradient of the <br /> former waste oil tank. <br /> i <br /> PHSIEHD has a Technical Review Committee which performs evaluations of case closures. You <br /> may request to present yourclosure report to that committee for their comments. <br /> Please submit a workplan or a request to schedule a presentation for the Technical Review <br /> Committee in writing within 30 days of the date of this letter. <br /> If you have any questions pleas-c.contact Steven Sasson, RENS, at (209) 468-3459. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Steven Son, SeniorHS Diane M: Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> SS <br /> CC: Bernie Sloop, AM&M <br /> Elizabeth Thayer, RWQCB <br /> Jeffery Bold, Dames and Moore V <br />