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<br />dearorhemicat gee senior. The• setno: pr~idn t <br />voltage otitpnt rv6ier b lioeaziy rained ~ the absohaoe <br />ooncaatradoq of q The taaacy of Ihr usssor is <br />0.196 Os. Daring aeaatanmeass ovrr dear. the output <br />fmm the witmeeat- was rewrded tm a portable <br />compute. <br />WWlams (~ tested the aaaracy of the setrsor <br />ova a rtmge of eoedldom observed is We pretunt <br />IIeld study, iadoditt< vuiadon in umpesseuee atsd <br />drop !a beadspace preaare due' m oxy~m <br />eonto~tinn. The laboratory tewlts foddiare s lirxear <br />drop in feasot response with deucastag ptessute sad <br />increasing tempaahae. For the tutge of pr~tae and <br />tsmperanue varEadom observed during Bald <br />meastuemeats, the rtuirrloa is the seetsvr ruse <br />was Insignifit:adt. <br />The sexmttivity of the oxpged cotmumptioa rate messuremesa {a the ffdd was tested by measarrtog <br />the atmospheric oxpgea coxmaadon before and sfta tae n meaaurementa. The maxhtrum <br />cAsuge is tae measured atmoaphaic oxygen conceatndons equals f0.i moles O3 m'ryear'' represemdng <br />a drift is measmemeaa sod b asaumeri m be the Iowa detecdon limit for tae anent method of <br />moditoting oxygen conmmptiun rata. <br />ThC Oxygen COilWmptlOn rues was <br />trsonieoced a 26 test stn m ode exisriag <br />tsilinga over an area of 10 ha on s tallhtgs <br />that was Inactive slate 1986. At nine sites <br />along a line the[ progteeaed from the tar~iaga <br />discharge none to :podded azra (DL-D9), <br />the comumptlon rata were alottioored <br />severe[ time ova atwo-momh period. Tae <br />26 texe slid ,7lustrued ddfatmt oxygen <br />avallabilhy and included vaziatioa is the <br />presence of 5ne-g<aiaad lupus add the depth <br />tb the waxer table. Two additioaai eolttmn <br />can5guratiom were esorblisaed slang the <br />transact u sites D2 through 171, the column <br />n each site iorluded a 20 em taick fine- <br />grslned sadd layers ova the oulidgs. la the <br />other column, 20 cm of tae uppermost <br />oxidized zone wan removed and replaced by <br />ttnoxidized tat7iags (Figure 2). The Me seed <br />was obtained by sieving <110 mach material <br />from the sand add gravd quarry adjacent to <br />the tailings. No anempt wet made >n obtain <br />'ideal' cover muerisl, Ar sites D2, D4, add <br />b7, additional eolumm similaz to the others <br />a 2 - ExpexiateaW setup showing tae cob <br />ltuadods incindiag sites wits Aae grained sw <br />with udoxidtted ta7iffgs n We surface, and <br />eter for the aollecdon of elRnesu. <br />10112 <br />o~w~wrnmu <br />