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MCTC Response: <br /> The intent of the remedial investigation activities is to gather <br /> sufficient informatiow to identify and evaluate potential <br /> remedial actions. It is premature to mandate that Phase IV wells <br /> be capable of monitoring the effectiveness of implemented <br /> remedial actions. <br /> DHS Comment: <br /> Page 4-8 Second paragraph: <br /> Revise Phase IV groundwater assessment activities to <br /> include- <br /> The. construction of nested systems at all six proposed <br /> (single) well sites shown on Figure 4-3 and at (or in <br /> close proximity to) the locations of existing <br /> monitoring wells Mu-323 and MV-328. See attached copy <br /> of Figure 4-3 which identifies the (approximate) <br /> locations. <br /> Each nested well system shall include a minimum of <br /> three individual wells which are screened to <br /> represent the shallow, intermediate, b deep zones <br /> of interest in the aquifer. The specific depths <br /> of the screened intervals shall be based on <br /> lithologic conditions. For wells installed to <br /> determine and monitor conditions of the tipper <br /> aquifer, the screened interval shall not exceed 20 <br /> feet in length. For wells installed to determine <br /> and monitor conditions of the intermediate and <br /> deeper zones of the aquifer, screened intervals <br /> shall be limited to a maximum 10 feet in length. <br /> Note- <br /> Figure 4-3 shows 3 new wells adjacent to CVS 20-01 <br /> while the description of screen lengths to be <br /> installed implies 4 wells. It is assumed that 4 wells <br /> will be installed: the Department will not aoorove <br /> installation of a multiole screened well. <br /> MCTC Response: <br /> The Phase IV groundwater assessment activities description will <br /> be revised to incorporate the following modifications: <br /> o Clarification that the activities are subject to <br /> modification based on evaluation of field conditions <br /> encountered. <br /> 11654 5 <br />