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Page 2 <br /> 4491 W. Durham Ferry Road 1 <br /> perform this monitoring, they need to have a set of gauges for each well and be <br /> able to insure that the temporary systems are airtight (not allowing any flow or <br /> vacuum leaks into or out of the system). <br /> Significant contamination continues to be evidenced at this site during routine <br /> quarterly groundwater monitoring events. It is the concern of PHSIEHD that the <br /> SVE system in operation at this site be functioning at maximum efficiency to <br /> optimize its ability to remediate this contamination in the shortest time possible. <br /> SVE system performance can only be evaluated with thorough monitoring of <br /> each system component. <br /> During the meeting Henry Hurkmans stated that it was the intention of <br /> Clearwater Group, Inc. to have this system in operation for three months. <br /> PHSIEHD questions this timetable. In their June 9, 1998 letter to Mrs. Ruiz, the <br /> State Water Resources Control Board, Technical Review Unit pre-approved the <br /> cost for a six-month SVE/AS unit rental_ Please have your consultant clarify this <br /> discrepancy to PHSIEHD. <br /> Please have your consultant inform PHSIEHD when installation of the required <br /> instrumentation and sampling ports will be completed, and have them send <br /> PHSIEHD a detailed copy of their proposed operation and maintenance <br /> schedule along with a detailed as-built diagram of the SVE system. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS <br /> Director, Environmental Health Division <br /> G[ C�"�c a.t.- <br /> Lori Duncan, REHS Margare Lagorio, REHS <br /> Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Mark List, CVRWQCB <br /> Brian Gwinn, Clearwater Group, Inc. <br /> i <br /> i <br /> k <br />