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T~ 14~ ~ '~' <br />quite 2O~J, 3~Q~ Shoreline Drive, Vvay~afa, Minnesota ~539~ <br />phone; 95~~47~-949 ~ fax: 9~2~47~~94~~ <br />June ~, ~0~5 <br />Mr, John Esl~s <br />~i`vision Metra District <br />Section Regular ~`acilities <br />ll~innesota Pollution Control Agency <br />5Z4 ~ayfayette Road <br />St. Paul, Minnesota 55155 <br />Mr. Matt Ledvina <br />Natural Resource group, Inc <br />$o South 8t~' Street <br />N~inneapolis, MN 55402 <br />ievzse~. ~drogeo~ogic ~va~~at~o~ ~Pha~c ~ azad ~I} .cpo~•t, wate~• o~.itoring <br />Systcrn ~~h~.sc r~} Rcpart and ~.'hase ~'~ water ~a~i~ Mo~itori~~g word ~'1an, <br />~o~th ~evelopm.cnt ,Area, Elk .fiver ~an~fill ~~w~7'4}, 11~ .lverg ll~ <br />Dear Mr, Sirs; <br />Enclosed are two Copies of the Subject Repa~~t for the proposed Permit Modificatio~a at the <br />referenced facility, <br />The repar~t has been revised to include findings frog. additional in~restigation conducted as part <br />of the Supplemental Phase III ~-~ydrogeologic Evaluation and details to address the comments <br />submitted on behalf of the Minnesota Pollution Contras Agency August ~, 2004} and the City <br />of Ells River May 11, 2004}, To assist you with review of the revised report the refe~~enccd <br />camments are reproduced below in italics followed by responses in standard font, <br />MICA Comment fetter dated Au u~t G ZOO4 <br />1. The h,~d~aul~c p~^npertres of the upper autwash sand were. ~e~Z defined, ~Iawe~er, the <br />hydraulic ~e~ati~nship between the lower out~ash sand, the tirl unit, and the upper <br />outwash sand has not been defined. ~'ar example, what is the Zever of the <br />patentiometric surface of the dower autwash sand? also, could ~t be determined if the <br />rower outwash sand was saturated at the base of the tzrZ unit? ~4dditional <br />