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L I I Lllilt101] i,0. <br />'r;I'PH1N u0 i);~`.S OF FERPiI1' 15Sfa.?eCE, THE PERI•]IT'~•r~~. h~L'~1 <br />• SUBPiI'P CAL•C:ULATiONS S]lOiJItdG 'i']IE AMOUNT THE GATED SPILL- <br />'r!AYS Old Tiff NORTHERN N0. 1 PORTAL/COAL STOCiiPILE, REFUSE <br />DISPOSAL AREA, AND RIEI4AU N0. ? SEDIMENT PONDS DIUST BE <br />OPENED TO ALL04J FOR AUTOMATIC DEk'ATERI1dG YJITH Ald AVERAGE <br />RETE1dTI0td TIP•lE OF 24 HOURS. <br />Itd ADDITION, THE PERMITTEE I•]UST SUBb7IT DESIGNS ARID SUPPORTIA'G <br />CALCULATIOIJS FOR AN AUTOP~IATIC llEWATERING DEVICE YJHICH <br />ALLOLJS A1d AVERAGE RETEIJTIOA] TIME OF 24 HOURS TO BE INSTALLED <br />IN THE IORTHERN N0. 1 OFFICE AREA SEDII~'fE14T POND. THE <br />AUTOMATIC DEI~iATERINC DEVICES AT THE NORTHERN IdO. 1 <br />FACILITIES MUST BE INSTALLED EY FALL OF 19$5• <br />Northern Ci~ 1's Answer: <br />The o~ _:,iaJ;'s required are detailed on the follovring <br />pages a'^:~r i:~ith the supporting calculations. <br />A small ::r_a exemption has been applied for that mill <br />eliminaL~ 'he pond beloL•; the !iorr vacated office site. <br />A cony c:' .!;e exemption is included for reference. <br />_~ <br />L J <br />