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~~ <br />g <br />j <br />0 N OD fo »d ~ a>o tip 110 <br />Olaaliolb PenO (mj <br />+o1a --waa.o++ -«oaaurse <br />gore 4 - Oxygm consumption rates verses tee d <br />the pond for We sines Dl-D9, indttding sits with <br />ed coves and wtatidSxed tar7hrp on the surface. <br />miaeratt a taint of tla hiroory of We <br />mllnp she, D2 to We tailhtgs <br />dbldtarge area eeptsmn a typlea! pegdle with <br />m apps oxidised sotle and a lower motddtaed <br />moe. Nar the pond, when there L a skeilow <br />water tsbl0. the oaidhwd aotse ht tloitad m the <br />upper m ®or tee aotlhrp. <br />'il+e reeniu etom me ottygm <br />ooosumpdon meu~mts tt site Di-iM, <br />tac7udioi ettperimmts whts t{ae~atnOd layms <br />and tmolddlzed ta8htq ttro ttu~ed >a <br />1'igors 4.'Ibe orygm eoosm~dos vaciea from <br />250 molar q m°yar' at sloes whero the water <br />table ht blow the oxidation none m leas Wan <br />0.1 tnolea q m°year' darer to Ws pond <br />whets the water table approae6a We grwod <br />aotfica. Whm noaaidhted ta0brp wens placed <br />on the taiihsga tnrfxe, We d>anmce oxygen has <br />to diahte ht otdec f4 reach the oxidatloa wne <br />is decreased approximately by a boor of two and oxygen coosomptlon value were as high as two dma <br />the aoobient rates m oxidlud tailings. 'I]tae raulp are eoasisemr whe modelling malts presettaed by <br />Eiberling et at. (9). Goner to the pow, the oxidation zone is situated doter m the grwod 6urbce and <br />Wier affect dacsnta. Wo difftsencee were obsetwed between sites wiW sad without onoxWiud dilatgs <br />at sites wiW de~tht rb ware: table {ess rhea 0.2 m. <br />The near-surface atfearve difibsbn <br />ooeflldem aaa deaeatad by a boor of 100 <br />or more bdow the ilae-graiaad sand layer <br />that mainmined as g076 tuorsdon value. <br />'ilia is wosisteat whh the eotpected change <br />m the D„ atom We thmretiai relationship <br />between the eftatxive difNuioo coeffideru <br />and degrera of satutmion. The importance of <br />the water toatemt might even be greats if <br />oar-aaatrated coodidoas whhin We fins <br />grained cover oonid be obtained and <br />maintained ovc ezrmded periods of dma. <br />This factor of 100 teducdoo caald <br />conceivably be Improved if more <br />appropriate engineering sdection Of Dover <br />material were made. <br />Two mole of txrmumed Or produces approximately 1 mote of 50a' that the oxyjea <br />is Daly cnasumed by the talphot tnmpotumt of FeS and that oxygm It the Daly oxidation agent for the <br />Itl04 <br />