Wednesday, April 16, 2014 * 4:00 p.m. Dr. Perry H. Rahn, P.E.announcement with Dr. Rahn's research Abstract. Wednesday, April 16, 2014 * 4:00 p.m. * CB 204W Dr. Perry H. Rahn, P.E.

buDjeci: t-wa: t-w: tLampus Community] FW: CEE Graduate Seminar Series: Wednesday, April 16th 4:00 pmCB 204W

This is TODAY. You received notice of this a few days ago, but here is theannouncement with Dr. Rahn's research Abstract.

Wednesday, April 16, 2014 * 4:00 p.m. * CB 204WDr. Perry H. Rahn, P.E.

Professor Emeritus, SDSM&T Department of Geology & Geological Engineering

"Permeability of the Inyan Kara Group in the Black Hills Area"ABSTRACT: Fluvial sandstone channels in the Cretaceous Inyan Kara Group in western South Dakota havevariable thickness and texture, causing variability of the hydraulic conductivity. Pumping tests in two 120-ft thicksandstones at a proposed in-situ leach uranium mine in the Dewey/Burdock area provide hydraulic conductivitydata. The hydraulic conductivity in the upper sandstone (Fall River Formation) is 0.45 ft/day and the lowersandstone (Chilson Member of the Lakota Formation) is 1.56 ft/day. These data, along with the prevailing gradientof the potentiometric surface, can be used with conventional Darcy Law equations to estimate the groundwatervelocity. The average groundwater velocity for these two sandstones in the Inyan Kara Group is approximately66 ft/year.

Real groundwater velocity data for this aquifer seem to invalidate this Darcy Law prediction. Based on tritiumdata, Gott et al. (1974) determined the groundwater velocity in the Inyan Kara Group in the Dewey/Burdock areais 5,480 ft/year. This value seems very high, but may indicate fast groundwater movement through verypermeable units or through fractures.

An important environmental consideration following the abandonment of this proposed uranium mine is that thegroundwater will migrate down gradient and may contain a high concentration of dissolved uranium (with daughterproducts radium and radon) and selenium. The rate of movement of these elements would be less than thegroundwater velocity because of retardation associated with geochemical reactions related to changes of pH and

https://us-mg6.mail.yahoo.com/neo/launch?retry ssl=1 4/17/2014

Writers t(N$t3ral gas is the 'new

major focus for energy and hasnegatively affected the nuclearindustry resultingin decreaseddemand for uranium. Germanyis nearly nuclear-free and othercountries are closing down reactors.

The USA's reactors are in ill-repair and very susceptible toweather events, earthquakes anterrorism. Our method of stor-age for spent fuel is outdated,making our reactors very vul-nerable. Europe uses a "HOSS"(hardened on-site storage) sys-tem, greatly reducing risks.

The USA is closing reac-tors and has sufficient uraniumavailable. France is perfectinga system of re-using uranium,which will further decreasedemand.,

Confusing the public are

)o dose to Powertech uram, urn proposalowertech relationship and his' if the public were to be apprised reads the NRC, EPA, USGS liter-nm auffior owed" wife's being a Powertech lob- of these peoplelý relationships to, ature and scientific studies from

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Cindy Turner wrote a for opposing the mine and st sPowertech employees, share - artic e 9 id City "ISL mining is intrinsically safe," tific themselvesholders and supporters writing Council's resolution, comparing contrary to EPA admittance rely on what a companyletters to the editor but not the proceedings to the Salem that in situ leach technology is " it will do; that is called

d identifying their relationship. Witch Trials and calling Dakota way ahead of health and safkty s es pitch," not fact. ,This is im ublic Rural Action an "environmental knowledge. Clem e sing ur=Wqp--0

extremist group" and then threw unethicgland"Othtt oscýien2 7 mining bee en-ee d n beRep. Mike Verchio stated in pine beetles I s . In fact, because the ý\tific d= ents and letterscanThiscer wasn't a problem in Bev Gehman wrote an utra- done underground is the tor have repeatedly

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*uDject: i-wa: t-W: [Campus Community] FW: GEE Graduate Seminar Series: Wednesday, April 16th 4:00 pmCB 204W

This is TODAY. You received notice of this a few days ago, but here is theannouncement with Dr. Rahn's research Abstract.

Wednesday, April 16, 2014 * 4:00 p.m. * CB 204WDr. Perry H. Rahn, P.E.

Professor Emeritus, SDSM&T Department of Geology & Geological Engineering

"Permeability of the Inyan Kara Group in the Black Hills Area"ABSTRACT: Fluvial sandstone channels in the Cretaceous Inyan Kara Group in western South Dakota havevariable thickness and texture, causing variability of the hydraulic conductivity. Pumping tests in two 120-ft thicksandstones at a proposed in-situ leach uranium mine in the Dewey/Burdock area provide hydraulic conductivitydata. The hydraulic conductivity in the upper sandstone (Fall River Formation) is 0.45 ft/day and the lowersandstone (Chilson Member of the Lakota Formation) is 1.56 ft/day. These data, along with the prevailing gradientof the potentiometric surface, can be used with conventional Darcy Law equations to estimate the groundwatervelocity. The average groundwater velocity for these two sandstones in the Inyan Kara Group is approximately66 f/year.

Real groundwater velocity data for this aquifer seem to invalidate this Darcy Law prediction. Based on tritiumdata, Gott et al. (1974) determined the groundwater velocity in the Inyan Kara Group in the Dewey/Burdock areais 5,480 ft/year. This value seems very high, but may indicate fast groundwater movement through verypermeable units or through fractures.

An important environmental consideration following the abandonment of this proposed uranium mine is that thegroundwater will migrate down gradient and may contain a high concentration of dissolved uranium (with daughterproducts radium and radon) and selenium. The rate of movement of these elements would be less than thegroundwater velocity because of retardation associated with geochemical reactions related to changes of pH and

https://us-mg6.mail.yahoo.com/neo/launch?retry ssl=1 4/17/2014

Writers top close to Powertech uraium proposalaralga is the new owertehrelationship andlhs' if the public were to be apprised reads the NRC, EPA, USGS liter-

major focusfor energy and has; wife's being a Powertech lob- of these people's relationships to ature and scientific studies fromnegatively affected the nuclear Rebecca R. Leas, Ph.D., byist in Pierre. He claims the Powertech. rindustxd resulting.in decreased Isa health education Crawford, Neb., mine has no In a Journal Forum article,demandifor uranium. Germany speciaist In Rapid City problems, but government doc- Powertech CEO Richard Cle - Hollenbeck's statementsis nearly nuclear-free and other uments demonstrate otherwise ent belittled a Rapid City ch conjecture, notcountries are closing down reac- Cindy Turner wrote a for opposing the mine and sta stors. Powertech employees, share- arti e id City "ISL mining is intrinsically safe," tific e.nts themss s

The USA's reactors are in ill- holders and supporters writing Council's resolution, comparing contrary to EPA admittance rely on what a companyrepair and very susceptible to letters to the editor but not the proceedings to the Salem that in situ leach technology is "claims" it will do; that is calledweather events, earthquakes and identifying their relationship. Witch Trials and calling Dakota way ahead of health and safety pitch," not fact.terrorism. Our method of stor- This is im tnv ulc Rural Action an "environmental knowledge. Cleme 'e siguage for spent fuel is outdated, to . extremist group" and then threw unethi thout scientifi mining have beemaking our reactors very vul- Rep. Mike Verchio stated in pine beetles! it. In fact, because the tifi douents and lettersnerable. Europe uses a "HOSS" cancer wasn't a problem in Bev Gehman wrote an outra- amage done underground is the editor have repeatedly(hardened on-site storage) sys- Fall River County but cited no geous journal Forum article, "hidden" and we can't observe rerred to government docu-(hareed US sosn g

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tem, greatly reducing risks., source. He failed to mention that engaging in extreme name- it nor perfectly predict what s and scientific sources.ree

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The USA is closing reac - he helped write and pass SB 158, calling and fallacious claims occurs, the likelihood of greater erevewed,4cience, not -salestors and has sufficient uranium strippig our state p-rotectio ] I st an Edgemont rancher, long-term damage occurring is i s what our state lead-

cogtr damaige pocrigiavailable. France is perfecting (along with legislators Lance d Edgemont's Bill Curran significant, rs should be using to guidesystem of re-using uranium, ussell, Bruce Rampelberg, opponents "Chicken Littles!' Powertech's project manager outh Dakota's future.

which will further decrease B Gosch and David Lust). Rep. Mark Kirkeby called ark Hollenbeck wrote an arti- Beware: water will be thedemand. R'dy Brich's letter.failed Rapid City Mayor Kooiker a liar. c accusing opponents of fear elimiting factor for future eco-

Confusing the public are to men his benefiial It certainly would be helpful mon e nomic growth and sustainability.