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" GPs, covers or diversions to mini <br />" limited holdin mize in#iitra <br />g times, i.e. limit the tiro tton of <br />For the Division to a available formin water or snowmelt, or <br />balance have bean ~1oN' waste rock to Precipitation to contact the ore <br />rock w°~d be m~mze rem unprotect or waste rock. <br />classifieds diluted s ~ the operator should show ~ and st~Il <br />am. $ ufficienflypnor to g gro that assure that im <br />the lar ~ ecause sel enterin Pollutants released from ai to gic <br />gestpercenta ~~ concentr urtdwatex at some use the ore odrolo <br />mmim1zation of • ge factor, sele ations exceed both Point or waste <br />nnpacts to the h mum is used to derive the diluti ~ound Prior to <br />that pollutants will be diluted Ydrolo and surface w meeting a <br />I understand at least 46 °. balance (see Table I , values ater standards by <br />the o roes ) For w neCe~~' tO demonstrate <br />ante piles toe hmg a stye ~ it must be <br />mnofr' the w at Pe stablish e JD Mines ah• ade reac am (sere lead demonstrated <br />anticipated some Yhas constructed > Table I). <br />~s P4nd is from some desi protection for a small <br />place to meant to evaporate rath~~'storm: I would recgroundwater. This pond sh o~retention fea <br />prevent ev than leach slow] °~end at le ould retain tm'es <br />fluids maybe acc aPorite residues in the Y into ast Ute 100- all of the <br />eptable provided the pond from beco ~Oandwater Peat storm, If water in <br />Permit is revised a mmg blowing dusthere should be measures in <br />Thera is preced ppr° ri <br />order to ent m the Division P ately. I-and application of the <br />meet groundwat allowing dilution of <br />groundwater numeric ~ numeric protectio <br />can be expected ifrain ootection levels, the o n levels. contaminants with fresh water or <br />If dilution is selected water <br />Numeric protection levels snow melt p~'ator should as a m ~°~d in <br />the dilution c drives pollutants fr construct a model sho Bans °f meeting <br />alculations. may also need to be deveIo °m the r°ek g what dilutio <br />piles into Local ~n <br />Ped if high a-nbient levels ~O~dv' n rates <br />The Division sho are to be ater. <br />g~'oundwater nhould carefully evaluate the considered in <br />proximity to go d eS' Thts will require sitc-oximity of ore and waste rock <br />and reclamation water, size of sPeciflc piles to <br />and clo ore and waste rock examinations that consider surface and <br />sure techniques facilities <br />Discussion: The S > duration of their ex roximity to streams <br />of slightly acidiFiedm~etic Preci Posure to weathering, <br />nitric acid deionized wateration Leach Procedure <br />It is reco ) to 100 g °f Powdered (ini tial pg . 4.2 usin (EPA Method S W_g46 <br />gnized that the SPLP is ~~ple' and agitating the a mixture ofHzSO4 andrequ~es addin <br />may derive from a rock ggressive mixtu g 2 liters <br />Sl'LP• Tesi results for mass under na fest that tends too a ~d~OVei•-end at 30 03 (sulfuric and <br />conditions. this stud rural conditions, uuless rstate the rpm for 1 g hours <br />do indicate hlathough t]te test is c arc °Ons~dered m their n amOant ofpollu <br />on these <br />Paz'ameters~etets are likely oa11Y more aggr~sitve ~ fight be expected nndere crashed as ~ttathe <br />prunaril appear under na an natural conditions worst-case <br />Overall, I Y to minimize the rel rural conditions. might allow <br />believe the facilities n ease ofcont Operators ° the tests <br />potential ex eed to ex ammanis fr°m their ° may wish to focus <br />Posure to amine Perations. <br />ground and surface water. their ore and waste handlin <br />g Procedures in context of <br />Cc: $ruce IlumPhries <br />Carl Mount <br />Steve Shuey <br />3 <br />