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CLEARWATER <br />' G R O U P, I N C. <br /> £nvirenn—ntal Serv,c,-s <br /> results of this thorough testing indicated the radius of influence for each well ranged from 17 to 35 <br /> feet (please refer to Clearwater's Problem Assessment Report, Feasibility Study, and Remedial <br /> Action Plan dated February 21, 1996). While Clearwater concurs that the footprint of vacuum <br /> control in the vadose should be verified with the system operating, it should be noted that a <br /> substantial amount of radius of influence data already exist for.specific wells at the site. <br /> (4) "During the meeting Henry Hurkmans stated that it was the intention Clearwater Group, Inc. <br /> to.have this system in operation for three months. PHS/EHD questions this timetable. In their <br /> June 9, 1998 letter to Mrs.Ruiz, the State Water Resources Controi`Eoard,Technical R-eview TJnit <br /> pre-approved the cost for a six-moth SVE/AS unit rental. Please have your consultant clarify this <br />�I <br /> discrepancy to the PHS/EHD." <br /> E It is unfortunate that miscommunication must'have occurred-here. Clearwater intends to perform <br /> ongoing review of system operational data to determine remedial efficacy. In general, I envision <br /> the SVE/AS system operating until contaminant recovery becomes negligible, a point-to be <br /> I <br /> f. determined jointly'between the.SJCPHS/EHD, Mrs. Stella Ruiz, and Clearwater. If remediation is <br /> needed beyond the initial six month period (end of March.1999), cost pre-approval,will be sought <br /> j from the UST Cleanup Fund for additional operation. <br /> {4} "Please have your consultant inform the PHS/EHD when installation of the required <br /> instrumentation and sampling ports will be completed, and have them send PHS/EHD a detailed <br /> copy of their proposed operation and maintenance schedule along with a detailed as-built diagram <br /> of the SVE system." <br /> f It is anticipate that these modifications will be completed by the end of January 1999. The <br /> operations and maintenance schedule will be discussed in the next groundwater monitor report, <br /> which will also provide an as-built remediation system diagram. <br /> I look forward to working with you to compete remediation and close this project in the future. If <br /> you have any questions, please feel free to calf me. <br /> I <br /> Ms. Lori Duncan, SJCPHSIEHD 3 December 23, 1998 <br />