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Mr. John Elks, MPCA <br />Mr. Matt Ledvina, NRG <br />October 7, 2005 <br />Page 2 <br />-NRG comments via email to WMI on July 22, 2004 <br />-NRG comments via email to WMI on August 25, 2005 <br />3. The lithology of SBS on the soil boring log at total depth will be corrected <br />The Iithologic description has been cai~•ected and a revised log is attached. <br />4. The MPCA recommends that proposed monitoring wells P-321 C and P-322C, located <br />along the southern margin of the South Development Area (SDS) be moved northward to <br />coincide with the 10 year footprint. MPCA understands the current operations of the <br />sand and gravel mining could complicate placement of these groundwater monitoring <br />wells. The MPCA will work with Waste Management on the f nal location of these wells. <br />Potential future development of the SDA will required abandonment of these wells and <br />the installation of additional groundwater monitoring wells along the southern margin of <br />the facility. MPCA staff understands that a revised Phase IV Water Quality Monitoring <br />Work Plan will be submitted. <br />WMI agreed to this eonce~t,Twhich will be addressed in the Phase IV Water Ouality <br />Monitoring Work Plan, ~Spe~ppl~al-ef-tl~ap~n~pl~~~T ~ ~~'~,~~~o~aat-fit <br />~garding~-ger->:item-wel~I-3.ee-atie~s-~i-an-updat '~-plan--wil~a~ <br />surd: <br />NI2G Comments dated August 25, 2005 <br />WMI recognizes the comments regarding alternative stratigraphic interpretation presented in the <br />comment letter and will continue to refine the working stratigraphic model of the site as <br />additional data is gathered. <br />1, Figures 17, 19, and ZO should be revised to show the extension of the flow boundary <br />further to the east in the northwest area of the SDA. <br />Revised Figures 17, 19, and 20 area included in the attached Addendum. <br />2. The compliance boundary should include well 317 OWA during the early stage s of <br />development. This well will subsequently be abandoned as filling progresses to cell 24. <br />WMI will include well 3170WA in the compliance monitoring program until the well is <br />abandoned. <br />C•\Documents and Settiuas\neriaclLocal Sett~s\Temporary Lttemet riles\01 K33E\SDA rev rent responso ltr oc6s\Besumenis~snd <br />SeE{ittgslt~eHese831zesal~SeHingslTentp9ra~y-I+~term~t-T~les\AbI4-1~1SDA-rav-retst-respense-4k:dos <br />