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R,ndahl & Associates <br />tant to note, that due to the nature of the <br />sand and gravel being mined, siltation of the <br />ponds is not expected to occur at a rapid rate <br />and the dfaad storage area should handle the <br />silt and clay for the full period of <br />operation. <br />f.f any cl-i~riucal.=_. ar•~~ user. :n i-hE-~ ~r-ac.ess plant. ~r~d <br />inc.or'por-at.ed i.ni.n the ta-`.f1uE_~nt r•rate~~rs, the aop:! icat~.~~n shuul.ci <br />raddrE:as the. nai:urr? of i::hesra c~-~emi.r_al sn~.~1 po~_enti.aJ comrnuni:~n <br />with grnund~•u-fifer via the I_ionds. <br />No chemicaF.s will be used that would be incor- <br />porated ini=o effluent waters. <br />]!l. l-h~~• ~„pP].i,::~~tic:rn is d.nf.ici.c~n~t :in tl-.e disra.re=i.on ~~+ <br />~lr-a_uirluua~:-.er.. ~fhe yrrundo-:ate~r p~~.tterns mal-i tend-; tc iml:~l~. <br />th;.,t flow i. •s gnvcrn~~d Lry lh'= berlr-c:~cl; t:npoprapliy. I-iowevr~r., i.t <br />i= not:: stated how =tr r..~.ci:r.tr~,~~:• cantor-!r~, wr-~~rFa d,~-~terroined nr.. <br />1. i. 4::r-._~w:is.=.;r•~~. the e.leva~t~LOne:; (dep~tf~s {n? ~:nd r.;tr_~nt o~. <br />grnun~.lwa{:e•r-. ftiia appl.icat:ion doe=: not ~:i.ve ..ny -nr'::u-rt~,~al:ion <br />In:~rtaini.ng {:o a groundwater yra,:.iient, yi~l.ds, per-me.abi].it~J n= <br />~~.llu•;iium, i.uidrarlying or atrat~igraphic char-rar_t.eri•at~ic~d., c,r <br />any other a n+ormation that would ,+11 uw can r-cr_ur_z{_e assrrs_~ment <br />c~f pre--mininr~ conditions or potential irt:p~_tcts imparted by th:= <br />opc-.~ atian. <br />The following theory and equations come from <br />"Selected Handheld Calculator Codes far the <br />Evaluation of the Cumulative Hydrological <br />Impacts of Mining," office of Surface Mining. <br />Using the pump test data fa a well located in <br />the same gravel formation as the proposed <br />operation at a distance of approximately one- <br />half mile, the aquifer parameters can be <br />calculated. <br />Well Fermit No. 18401 <br />Well diameter 36" <br />Pumping Rai_e 10 gpm <br />Drawdown 15 feet <br />Time of pumping 1 hour <br />5 <br />ngineering & Env,ronmental <br />