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Response to PHS EHD Comments Letter Dated September 10, 2003 <br /> Extraction Well and Monitoring Probe Details <br /> Wright has prepared the anticipated construction details forthe wells <br /> and probes <br /> attached as Figure 1. The wells and probes would be installed <br /> undaccess agreements and PHS EHD permits. The undersigned CEG has reviewed the <br /> above workplan and attached well details specificati6r1s. <br /> Well and Probe Locations <br /> The two extraction wells and three vapor probes are anticipated to be installed in <br /> individually drilled hollowstem boreholes (clustered not in a nested installation) on <br /> the downgradient side of the site. The probes positions may be adjusted due to <br /> utilities and the very small size of the site, r as well as to allow the interpreted best <br /> locations for collecting data. <br /> Measuring Gauge Installation <br /> Magnahelix gauges will be installed on each well and probe wellhead and sealed to <br /> prevent leakage during testing and pressure readings. The gauges will be adjusted <br /> as needed by the engineer for the work. <br /> Well Installation <br /> Wright will schedule the well installation to commence by October 18, 2003. <br /> I If you have any questions, please call. <br /> Sincerely, E D <br /> Wright Environmental Services, Inc. � <br /> aR GAO <br /> �'°q l� <br /> L t l 19262 <br /> CERMED <br /> .John Lynch Christopher M. Palmer ENOINEfRI,NG <br /> President REAII 20185; CEG 1262 GEOLOGIST <br /> OF CAU 5 <br /> Attachment: Figure 1, Vapor Extraction Well and Vapor Probe Specifications <br /> Revision 1 Page 3 of 3 <br /> k <br /> } <br /> 1 <br />