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Attachment - NRC-2020-000076 - Appeal Response to NRC-2019-000132. (Part 10 of 29)
	ML20015A360
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Issue date:	01/08/2020
From:	; NRC/OCIO
To:	;
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ML20015A350	List: ML20015A351; ML20015A353; ML20015A354; ML20015A355; ML20015A356; ML20015A357; ML20015A358; ML20015A359; ML20015A360; ML20015A361; ML20015A362; ML20015A363; ML20015A364; ML20015A365; ML20015A366; ML20015A367; ML20015A368; ML20015A369; ML20015A370; ML20015A371; ML20015A372; ML20015A373; ML20015A374; ML20015A375; ML20015A376; ML20015A377; ML20015A378; ML20015A379; ML20015A380;
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	FOIA, NRC-2019-000132, NRC-2020-000076
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lNTEftSATIONAL 0 i ! \\ 1 li l ' ) URANIUM (USA) CORPORATION Via Qvcmipt Mail Mr. Joseph J. Holonich, Branch Chief High Level Waste and Uranium Recovery Projects Branch Division of Waste Management Office of Nuclear Regulatory Commission 2 White Flint North, Mail Stop T-7J9 11 S4S Rockville Pike Rockville, MD 20852 Re: NRC Letter dated August 19, 1997, and December 5, 1997, regarding NRC Acceptance Review of the Reclamation Plan for the White Mesa Uranium Mill Source Material License SUA-1358 Docket No. 40-8681

Dear Mr. Holonich:

Enclosed please find our responses to the August 19, 1997 and December 5, 1997 NRC comm.ents to the White Mesa Reclamation Plan. This plan wa~ wbmitted to the NRC by lntt.mational Uranium (USA) Corporation on February 28, 1997. These responses were developed following telephone conference with NRC staff and contractors and will hopefully address all ofNRC's questions. If you have any questions on the enclosed responses, or require additional clarificatio~ please feel free to contact Michelle Rehmann or me at the letterhead phone or address. m:1~a~. C PDR HRR/pl Enclosures cc: Earl E. Hoellen David C. Frydenlund William N. Deal Michelle R. Rehmann V cry truly yom'S, / / 1 £~- Harold R. Roberts Executive Vice President ,.4(~

!, ti I I I I I I I I I I I I I I I INTERNATIONAL URANIUM (USA) CORPORATION Responses to NRC Letter Dated August 19, 1997 and December 5, 1997, Regarding NRC Acceptance Review of the Reclamation Plan for the White Mesa Uranium Mill Source Material License SUA-1358 Docket No. 40-8681 I-**-------------- 1 I December 16, 1997

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Den~~6, M-928 7798 (main)
303 389 412.5 (fax)

Vil Qvcmiab& Mail Mr. Joseph J. Holonich, Branch Chief High Level Waste and Uranium Recovery Projects Branch Division of Waste Management Office of Nuclear Regulatory Commission 2 White Flint North, Mail Stop T-7J9 11545 Rockville Pike Rockville,l\\iD 20852 Re: NRC Letter dated August 19, 1997, and December 5, 1997, regarding NRC Acceptance Review of the Reclamation Plan for the White Mesa Uranium Mill Source Material License SUA-1358 Ducket No. 40-8681

Dear Mr. Holonich:

&closed please find our responses to the August 19, 1997 and December 5, 1997 NRC comments to the White Mesa Reclamation Plan. This plan was b'Ubmitted to the NRC by Intanational Uranium (USA) Corporation on February 28, 1997. These responses were developed following telephone conference with NRC staff and contractors and will hopefully address all ofNRC's questions. If you have any questions on the enclosed responses, or require additional clarification, please feel free to contact Michelle Rehmann or me at the letterhead phone or address. HRR/pl Enclosures cc: Earl E. Hoellen David C. Frydenlund Wiliiam N. Deal .Michelle R. Rehmann Very truly yours, ~~ Harold R. Roberts Executive Vice President

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......_ to Nuclear Replatory Commluloa / Wlaite Mesa MUI Reclamation Plan Commeatl Dated Aapst 19, 1997 Soarce Material License SUA-1358 (1) llfl.,.,,,..,,, to,,wort* nwn, of tu~ of tu nulon 6turla tlolp. s,<<JJblly: (I) A dacrlptlon of die IMll4rlllb to /Je IISal for tJ,e 12"°11 lltlrtvr an4,u ralllll;111 JIU

Response

The materials to be Uffll for the radon barrier and M random fill are h.e clay and soil and rock derived from sandstone (random fill), respectively, that are available within the site boundaries. Theee materials were tested as part of the original tailings reclamation plan design. Based on empirical data collected to date on the cover material placed over portions of Cells 2 and 3, the random fill material alone provides an effective banier to radon flux. Following ue brief descriptions of the clay and random fill mmerials. Laboratoay tesdng of the clay maUllial wu performed following a field investigation of the Section 16 clay source. The laboratory results are presented in a letter report to Energy Fuels Nuclear, Inc., fiom D' Appolonia ConsultintJ Engineers, Inc. entitled "Section 16 Clay Material Test Data, White Mesa Uranium Project, Blaniling, Utah" dated March 8, 1982. This ietter report is presented in of this re.3ponse. Based on the above-meutioned report, the Section 16 clay source contains soils r,Jassified according to the Unified Soils Classification System (USCS) as CL, CH, SC, SM, and ML. The material is a fine pained soil with varying amounts of: silt and clay ))8lticles. The plasticity of the soil samples ranged from non-,plastic to highly plastic. BN¥k>mfil1 Rawlom fill material consists of soil and rock derived from sandstone and obtained from excavations within the site bo~. The,ioil and rr..ck have been stockpiled on the site for future rccJamation use. Soils in these stockpiles can be described generally as a granular soil with relatively low plallidty (railings Cover Design, Appendix A, T'!hle 3.4-1, indicates Plasticity Index of 7, and 48 percent pumll8 the No. 200 sfove). However, they cannot be representatively classified according to the USCS a the piles contain highly variable amounts of clay, silt, sand and gravel. Additionally, I.be piles contain varying amounts of sandatone cobbles and boulders which may be aeened during ieclemadon and utiliml as riprap. December 16, 1997

I,, I I I I I I I I I I I I I I I '.:I I Response to Nuclear Rcplatory Commission Comments/White Mesa Reclamation Plan -**---------------------Commeots Dlted A... ugust.___19..;.,_199_7 Random fill material~ obtained from the on-site stockpiles, currently covers portions of the tailings piles in Cells 2 and 3. The portions of these cells arc covered with three to four feet of random fill. Radon Ow measurements, prGSeDtcd in Section 1.1.2 of the Tailings Cover Design, indicate radon flux~.. the random fill material of less than 20 pCi/m2/second. These empirical data indicate that the random fill material alone is currently providing an effective banier to radon Oux. (U) All Mtllpls to sjow tJ,111 eac* type of material Is avallable Ill slfffkient Analysis of the quantity of the clay and random fill material demonstrates that sufficient material is available for constructing the cover. Clay Luer The reclamation construction estimate requires 259,100 cubic yards of clay material for construction ofilie clay layer. Based on anal)*sis of the field investigation data, quantities in excess of 1.8 million cubic yards of clay arc available. This quantity is more than six times the quantity of clay needed for the cover. The field investigation data arc presented in a letter report to Energy Fuels Nuclear, Inc., from D' Appolonia Consulting Engineers, Inc. entitled "Section 16 Clay Material Test Data, White Mesa Uranium Project, Blanding, Ut!lb" dated March 8, 1982. This letter report is presented in Attachment I of thie response. The clay materials wae identified in the Section 16 area encompassed by borings B-100, B-103, B-104 and B-106 u shown on Figure 1 contained within Attachment 1 of this response. The surface lffll b,,tween these borings is approximately l, 160,000 square feet. The average depth of CL and CH materials encountered in the seven borings is approximately 44 feet as indicated on Figure 2 contained within Attachment 1 of this response. Based on the surface area and average depth estimated from Figures 1 and 2, the quantity of clay material available is approximately 1.8 million cubic yards. 2 December 16, 1997

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I I I I I '*I I BfWknnfill Respome to Nuclear Regulatory Commission Comments/White Mesa Reclamation Plan Comments DaSed August 19, 1997 The redarnadon construction estimate requires 1,547,500 cubic yards of random fill material to complete the cover. The material \\f/ill be supplied from the random fill stockpiles generated ftom excavation of the cells for the taiKinp fieility. The location of these stockpiles is shown on Figure 3.2.1 of the Reclamation Plan. According to planimetric mea.uements, these stockpiles contain in excess of 9 million cubic yards of random fill material, which is more than five times the quantity required for the cover. (UI)

Response

The potential for cover cracking due to shrinkage is considered to be negligible for two reasons: First, the random fill material is a granular soil with low plasticity, which will inhibit cracking. Second, the clay layer will be overlain by a minimum of two feet of compacted random fill, which will prevent moisture loss from the clay. ftandgmfiJJ Cover cracking due to shrinkage of the random fill material will not be a concern, as the random fill consists of soil and rock derived from sandstone and is generally a granular soil with very low plasticity (failings Cover Desi~ Appendix A, Table 3.4-1, indicates Plasticity Index of 7, and 48 percent passing the No. 200 sieve). These material properties will inhibit cracking. During final reclamation, the stockpiles of random fill may contain isolated pockets of material classified as CL aceordiog to the Unified Soils Clauification System. Clayey materials encoW1tered will be mixed with the granular soils to minimize the risk of surface cracking. Clay Layer The clay layer will be overlain by a minimum of two feet of compacted random fill which will protect the clay layer from cracking. In older to determine the potential of clay layer cracking, the performance of the soils cover was evaluated using the Hydrologic Evaluation of Landfill Performance (HELP) Model. Weather data were input using the default parameters from Grand Junction, Colorado. Grand Junction is located nortbeut of Blanding, Utah in a similar climate and elevation. 3 December 16, 1997

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~., '.I Response to Nuclear Regulatory Commission Comments/White Mesa Reclamation Plan Commfflts Dated August 19, 1997 Baaed on thelc values the HELP model estimates an evaporative zone depth of 18-inchcs on barren soil. The surface of the soil cover will be considered b8ITen as the riprap cover layer will inhibit vegetative growth. Therefore, the moisture content of the clay layer, and six inches of random fill overlyina tho clay layer, will be protected from moisture changes which mry induce shrinkage. Thia ii a conservative estimate as the depth of the riprap layer, which will provide additional protection from evaporation of the underlying soils, was not considered in the HELP model evaluation. (w) A lklll,utlo11 of.-aura tJ,at wUI be Iden to plffffll burrowu,g """"'* fro* pendratln1 tJ,e nulon barrkr

Response

No meuures short of continual annihilation of target animais can prevent burrowing. However, reasonable measures will discourage burrowing including: Total cover thickness of at least six-feet; Compaction of the upper three feet of soil cover materials to a minimum of 9S-pcrcent, and the lower three feet to 80-90 percent, based on a standard Proctor (ASTM D-698); and Riprap placed over the compacted random fill material. Comment: (2) An ualysir of die total and dl/Jaellllal settlements of di~ talllll,s s,uface 1111d di~ ejf,ctr of slldl settle,_,,ts on soU COVf!r lnugrlty.

Response

Analysis of the total arid differential settlement of the tailings surface was performed using the survey data compiled for the five settlement monuments installed within Cell 2. These monuments Wel'C installed on the surface of the tailinss, bet\\WCl1 August 1989 and November 1992, prior to the placement of approximately three to four feet of random fill material. Survey results of each monument were plotted as time vs. settlement graphs and arc presented in Attachment 2 of this response. 4 December 16, I 997

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I Response to Nuclear Regulatory Commission Comments/White Mesa Reclamation Plan Comments Dated August 19. 1997 Review of the survey data and graphs shows that primary consolidation of the tailings has occwred, and the aettlement rate has been very slow with minor total values. The maximum total settlement m:ordcd is 0.97 feet, and the difl'erentia1 aettlcment is on the order of O.SO feet. Approximately 81 percent of tbe total measured settlement occum,d within the initial three years. Additionally, recent survey data indicata tlw the settlement has virtually stopped. From September l 99S to September 1997 the settlement averaged less than 0.03 feet per year, which is within the expectable survey error of 0.05 feet. This indicates that the settlement since l 995 is negligible.

Placement of the final rechunation cover will induce additional settlement. However, since primary couolidation of the tailings has occurred. under cUJffllt loading conditions, additional settkment is expected to be less than the total settlement values to date. This minor amount of additional settlement, due to the added surcharge of the cap, will not effect the integrity of the six foot thick final reclamation cover. Comment: (J) All 011tllptr o/ tl,e Uq,u/actlo11 pota,tlal of sllbs,uface llllltulab and 11r1111ium mJJJ tallbl,s.

Response

Analyds of the liquifaction potential of the subsurface materials and mill tailings was performed utilizing the data from the Tailings Cover Design and the Reclamation Plan. The results of the analysis indicate that the subsurface materials have no liquifaction potential because they consist r,,f unsaturated bedrock. Liquifaction of the tailings would be a concern only if the cover material cracked t.o allow a path for additional moistun, to enter the tailings and/or provide a potential escape path for liquefied tailings. However, the tailings placement methods have consolidated the sands to the maximum extent possible which will inhibit the potential for cover cracking. Subgface Materials Information about the subsurface materials was obtained from boring logs compiled in Appendix 0 of the Tailings Cover Design, which contains Section 2 of the subsurface investigation report prepnd by Chen and Associates, Inc.; entided Soil Property Study, F.arth Lined Tailings Retention Cells, White Mesa Uraniwn Project, Blanding, Utah", dated July 18, 1978. Tac bore log5 indicate that the bottom of the cells are within the unsaturated Dakota Sandstone bedrock. Therefore, liquefaction of the subsurface materials is not possible. December 16, 1997

II I I I I I I I I I (; ;, t~ .1 I I I I I I Reapome to Nuclear Regulatory Con_unission Comments/White Mesa hclamation Plan Commmts Dated August 19, 1997 Mill Tailiup The liquifaction potential of the mill tailings was a11alyi.ed using the data on the tailings properties and opendiona1 data concerning placement of the tailings. Information about tM properties of the mill tailings was obtained from Page 2-4, Section 2.2.3 of the Reclamation Plan. Operational proc.::dures were obtained &om Page 2-S, Section 2.2.3.1 of the Reclamation Plan. A. di.scussed in the ~~lamation Plan, the tailings produced by the mill typically contain 30 percent moisture by weight, have an in-plooe density of 74.2 pounds per cubic foot and have a size distribution with a predo.rninant -32S meth size fraction. These tailings properties indicate that the material is potentially liquefiable. Although the taiiinas properties indicate that the material is potentially liquefiable the method of tailings placement S\\~bstantially reduces the potential for liquifaction. Sluny disposal bas takenplaa, in both Cells 2 and 3. Tails placement in Cell 2 was accomplished by a perimeter discharge method with discharge points around the east, north, and west boundaries of the cell. The advantage of this method is that maximum beach stability is achieved by allowing tailings sands to interfinger with slimes during placement. During sluny disposal. solutions from Cell 2 were decanted and pumped back to Cell 1 for evap.:~mion, to minimize net water gains. Additionally, spray systems were utilize<i to enhance evaporation rates. These processes allowed maximum drainage from the sands. Tailings placement in Cell 3 is accomplished with a final grade method. The discharge points are set up in the east end of the cell and the final grade surface is advanced to the slimes pool area. When the slimes pool is reached, the discharge points are moved to the west end of the cell and worked back to the middle of the cell. The advantage of this method is that maximum beach stability is achieved by allowing water to drain from the sands to the maximum extent, and by allowing coarse sand depo!.ition to help provide stable beaches. Additionally, solution is recycled from the active cells to the maximwn 4!:i<tent possible. 1be tailinp placement methods have consolidated the sands to the maximum extent possible during active operation. This consolidation will minimize the risk of liquifaction as well as minimize the eff<<t of cover settlement which will in tum inhibit cover cracking. Cover cracking would be the only viab!~ pathway for the release of liquefied tailings as the tailing cells are fully contained with non-li~acfiable embankments. 6 December 16, 1997 .,*.\\ 20 22

ii I I I I I I I I I I I I I I I I I I Comment: Respome to Nuclear Regulatory Commission Comments/White Mesa Rccbar-dation Plan Commen11Dat&dAugust 19, 1997 (4) Be locatlo111 111111 tlqt/,6 of 11,e wnpla *<<I for atbrttdh,g tJ,1 p,.,,,,atlo of 11,, t,,1111,p """ cow, IIIIIID'lllb bl 11,, ldortdory, tllo11g w1t1, tldl,Jb of tAe luortllory ralllb. Moreowr, 11,e ffllllllutb 1111tVor procetl,ua ** to coll<<t 11,, 111111pla Md to IMIISlllW " IJMC/jk propmla sl,ollltl be llkntlfktl.

Response

The soil cover design consists of two material types readily available within the site boundaries. The cov~r consists of a clay layer and a random fill layer. Locations, depths, and sampling methods of the samples used for estimating the properties of the clay layer are presented in a letter report to Energy Fuels Nuclear, Inc., from D' Appolonia Consulting Engineers, Inc. entitled "Section 16 Clay Material Test Data, White Mesa Uranium Project, Blanding, Utah" dated March 8, 1982. This letter report is pmiented in Attachment 1 of this response. Random Fill Random fill and tailings testing was performed by Chen and Associates ( 1987) and the results of the laboratory testing program are presented in Appendix A of the Tailings Cover Design. Comment: (S) A dacrlptlon of tl,1 soU sampling methodology and lnst,,,,.IIIIIJlon, lncllUllng tl,1 11161/,od for det1rmlnlng bacigro1111d rtllll11111 co11c1nlratlon ond II dacrlptlon of any otl,er radlonucllda (e.g. Tl,-230) for w,.lch sa,npla wUI I# lated.

Response

For details refer to the Reclamation Plan, Attachment A, Sections 3.3 through 3.5 which discusses the methodology for the determination of windblown contaminants. All methods utilb:ed will be consistent with the guidance contained in NUREG-5849: "Manual for Conducting Radiological Surveys in Support of License Termination.,. I December 16, 1997

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Comm en_ts_D_~Ap 191 1997 Soil sampling n>>~~logy and instrumentalion is further discussed below in response to Comment 6 and Comment 7.

co... eat: (6) lllldMt* 6y wild, 1"'*"11,,, """'- Wtt sd<<tetl In th* 6Ctlplng 1,uvq to ~ wltdMr 1111 ana m,1"ra ~ 771* llld,od IOal to 4-l'lfflu tll* adlllll lltl-116 collCalrtldoa II, tu,oil dollltl H tlaerlW "' wdl "' tll* co~ Inell uMI to '*1Jllsl, tile pllWl,,e va/11& Relpome: QvithUoc Yaluoa Reclamation Plan, Attachment ~ Section 3.3.2, indicates that guideline values will be determined and will form the basis for the cleanup of the site. Specific guideline vabes have not been determined at this time. The method used to determine the actual Ra-226 concentration in the soil will consist of collecting a series of soil samples and correlating the, gamma tt-ading of a Mount Sopris Model SC-132 scintillometer (or equivalent device) with the Ra-226 concentration determined by a multi-channel analyzer (or equivalent device) on each soil sample. The actull number of samples used for correlation will depend on the correlation of the results between the gamma readings and the Ra-226 concentration. However, it is proposed that a minimum of 50 sample locations be te1!ted in order to determine a statistically based correlation coefficient of not less than 0.7. December 16, 1997 -~~~-------- --~j

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Commeat: Response to Nvclear Regulatory Commission Comments/White Mesa Reclamation Plan Comments Dated Aupst 19, 1997 (7) A tlacrlptlo11 ad rdonal for "'* crltala u.r*tl to tlefb,* "'* ~ of wlntlblown ldb,p co""'11dnatlon bqo11tl wl,iel, /111'11,a s.,,,,,U,,1 l.r not **ca1uy. R.eaponse: The description and ratfonal: for the criteria used to define the extent of windblown conwnination is presented in the Reclamation Plan. The sections of the plan containing this information for the scoping survey and the final survey are discussed below. Semtoa survey Reclamation Plan, Attachment A, Sections 3.3.2 and 3.3.3, indicates that the scoping survey for windblown contamination will be initially conducted using a calibrated Mount Sopris Model SC* 132 scintillometer ( or equivalent device) on a SO x SO meter grid. Furthermore, Reclamation Plan, Attachment A, Section 3.3.3 states: "Grids where no readings exceed 75 percent of the guideline value will be classified as unaffected, and therefore will not require remediation." Reclamation Plan, Attachment A, Section 3.3.S states: "After remediation, the affected areas deemed to be in compliance with st.andards will then undergo a final survey, utilizing a 10 x IO meter grid system with sample point locations as shown in Figure A-3.3.2." (Standard Sampling Pattern for Systematic Survey of Soil). The firud survey will be conducted with a calibrated Mount Sopris SC-132 scintillomcter ( or equivalent device) at each systematic survey point. When readings at two consecutive systematic sample locations do not exceed the cleanup standards the area extending outward from the first systematic point will be classified as unaffected and no further remediation will be required. 9 December 16, 1997

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Comment: RNpODN to Nuclear R.eplltory Commission Comments/White Mesa Reclamation Plan Comments Dated Aupst 19, 1997 (I) A *6cn,,IIM of Ill, "'6lp to * ""°'*' In 11,, 6Md.,. of Cal 44 ad"" 1111,uy,u to *l,ow 11'6fll<<1 of*** to l'fWMI IIIIY Jll*IIIW awlo&

Response

Liquids in Cell 4A will be evaporated to dryness and the crystals, synthetic liner and any contaminated soils will be placed in Cell 2 or Cell 3. Non-contamioatt4 soils will than be utilil.ed to reduce the southern slopes of Cell 3 from the current 3: 1 to the poposcd S: 1. Followina reclamation, Cell 4A will cootain no by-product materials. Therefore, the breach is desipied ooly to prevent ponding within the area. The deaign does not consider potential erosion of the breach area. It should be noted that no measures, limited to natural materials, will prevent any or all potential erosion. Comment: (9) A tlacrlptlo11 of 1,ow " tukqllllq of tJ,1 ""*""' proputla,a<<J Ill die dalgn of varlo,a CO"'POllffln of ltdllllg "'"'""'"""lib (1.g.,ffe/4 l,ydralllk co11dllCtlvlty of cover mat,rlal, solllmlllnp pro~rtla,aed for embtulklMnt tlalgn) Is verlfl<<I.

Response

Verification of the adequacy of the material properties used in the tailinp impoundment design was provided in a study provided by Dames and Moore, the results of which arc presented in the report entitled "Site Selection and Design Study - Tailings Retention and Mill Facilities, White Mesa Uranium Project" dated January 17, 1978. A summary of the material properties from the Dames and Moore report is presented in Appendix A of the Tailinp Cover Design. 10 December 16, 1997

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..,I I Co111m*t: Relpome: Response to Nuclear Regulatory Commission Commentl/Wbite Mela Reclamation Plan Comments Dated August 19, 1997 Drainage catchment area(s) and diversion channel(s) are not included in the design. A "clilcbarJe dJlnnel" is shown on Figure A-2.2.4-1, Sedimentation Basin Detail. The purpose of this channel is to pnMllt pondina within Cell I followina reclamation. A detailed discussion cf this discharge channel is presented in response to Comment 18. Comment: (11) A r~p/Off,uld of UNII P"I* of Ukgl6/e tlt,tt,. ffta* JHl6G till II, IIJJJHlltlix A of App,116 D fT11llln11 Cova Da'611 filu Maa MUI, October 1996 (/H,la 111111'/utl p. l:Z "°*" p. 11)/ """ In.,,.,.tllx G of ApJM,ullx D /1'""'111' Cowr Dalp Wille MOIi MUI, Odo/Mr 1916 (/1611n 1lulwlll1 c,oa.,.<<tlol, alo111 Oii 4 tllu)J.

Response

The seven replacement pages are included in Attachment 3 of this response. Comment: (l l) It l.r IIOI c,-, If dt* roei """'1>lllty tat rallla for dt* pl'OJIOffll 11111btoM solll'C* roek 11n INaMI M II aria of tllll'dlllty tats or 011 ollly o* lat; 11,aefon, 11tl4ltlonlll rock .,.,,,,.., tot bf!°""""°" l.t 11.W. At 11 """""""" /UC 11,olllll (1),,,,.,_ dlllYlblllty tot,a,lllsjo,MWl'tll ~ nd..,.,_; 111111 (l) wrtt, tut tu "'111 rqrae11ts ~,.,,,,,for~ ltllfllla; ""'(J) ptf1llwk...,_,_, ra'* If tlllfGat rocl tn,a wn ard. ~'*""*'1, IUC 11,olllll prtWIM /11111,*r }11611/kdo* tlull dte Uflonwtlo*... ,.. to.,,,_..,. rod """""""* F*rtl,er, /UC 11,olllll pl'tJIIIM lll/01'11111111111 tt/Jd64 to die l<<lltlo* of dt* propost!tl IOlllff(I) 111111, Ill ll<<Ol'fMlla will, Ill* crllalt,,...,_ 11, Ill* NllC SIIIJf T<<J,*kal lwldole, *"-",,..,. *"'6 of 11,e,,.,.,..,,le°""""""'° (llliltmllogy, W""'°",,/ttll:tlll'a, cay COll#III, de) IIJG Wff co"""'*'I 08 lff,wi. II December 16, 1997 *

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Response

Response to Nuclear Regulator; Commiuion Comments/White Mesa Reclamation Plan Comments Dated August 19, 1997 One rock durability test baa been performed to date. The sandstone sample was collected approximately one mile west of the site in the Westwater Canyon Area. Representative rock durability wtina and petroaraphic examinations will be performed as an integral part of Comtruction Quality Assurance procedura, prior to reclamation, on each proposed source (i.e. from IIIDdstone cobbles within the random fill stockpiles). Comment: (JJ) Bue4 011 111lu vi.flt co"'IICIM 1n,rtd ~MS fl60, tl,t NRC slllf/ Is IIWtll't tl,lll hlg,,- qllllllly.U,wlol rocl exists In tll* 1/te tuU. Baetl on tl,t JN*ntlally quatlonllbk qlUlllty o/ tl,t 11111dstone 1011rc*, tUltlltloul lnfonnatlon should be provultd regarding this.U,wud source and tht muons for lb r*Jection.

Response

The utilization of the alluvial source was not considered as the source is located within a riparian area. The potential impact during constnlction of haul roads and excavation of the alluvial material is not recommendable from an environmental standpoint. Conversely, the sandstone is readily available and the use of the material will not pose an environmental threat. Comment: (14) Ad4Jtlo11al ltfformation,,,ould be provided ng11rdlng the construction speclfkatlons (Appe11tllx F) and construction tatlng progra,,, to be conducted 011 the rlpn,p. Tit sp<<lflct,tlo,u 11,011/d bt revised to lnc/,uu specl/k ~rluru, for rocl p/llco,,ent. Speclflc toltrt111ca /or placemtnt should bt sp.cljkd for dtt rlprap 1111d jllJer, uptt""'11g 011 dtt slu of Ill* IIIOUrud king plactd. M<<uura,,uc1, tu dlptl, cJ,ecks on ",pedjk,rid, sllollld H provided ta vtrlfy tl,e tl,kknas of tht rlprap. Response: of this response contains "Specification for Construction of Rock Covers and Other Erosion Protection on the Tailings Cells". 12 December 16, 1997

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~', Relpome to Nuclear Regulatory Commission Comments/White Mesa Reclamation Plan Comments Dated August 19, 1997 Attacluncnt 4 is intended u an outline of the formal construction specifications that will be provided prior to reclamation. Specific values have been p,,cluded &om the docwnent as additional soil and rock properties (riprap durability for oversizing analysis / random fill grain size analysis for detamining filter criteria) will be verified at a later date. (See also response to Comment 12). Comm*t: (I J) 1'11* Nll.C Riff/' noto 11,111 ojllur l(,y,r Is not proposed for die rip,. layer Ill H plaad on tu JV OIi SH,,. alopo of de cA In~ 11.fllur ~r Is not n11111tttl/or top 1/opa (will, nllldNly /11111/opa Oj UOIII ON /#rulll or /a$), blll 11.fll*r U /luly to I# n--4 for tll* 1/u,Iopa. 71* jllla Is natled 6<<11,a* Nlocltla 11,rougl, ti,* 111,ga rtd w,1116 ""'Y erotle ti,* llllllmyl,,1 60II ptUtlcla. IUC 1/,ould prtll1iM II fllur., for"'*,,. 1/opa or pl'OVllk JIISll/1,clldon tJ,111 a Jllter layer Is not neetled.

Response

It is acknowledged that a filter layer will be required on the SH: IV side slopes. The filter criteria will be dcsiped in accordance with NUREO/CR-4620 "Methodologies for Evaluating Long-Term Stabilimion Designs of Uranium Mill Tailings Impoundments". According to NUREG/CR-4620, the D., of the base (random fill) is required in order to establish the filter gradation. At this time, the proposed random fill materials are stockpiled on the site for future use and extensive laboratory testing bas not been perfonned to determine a representative D.,. The filter layer gradation will be detennined prior to reclamation, when additional laboratory analysis is available. The filter layer will be included in the cost estimate. For costing purposes a filter thickness of six inches will be utiliml. Commeat: (16) 11.ocA -,l'OIUltoa an Uuly to be 111eded at dlose locations wh,re die steeper sitk slopes ,.., Ill* natlll'tll 1rolllUI. BIIUII 011 site vl.rlt.r to the 11tt11, dlen is sllJlkknt evidence of lldlN fllllyb,f,.,,, 1.U,,,,_.""'111 lido tl,e cdb Is poss/bk. &vnwl ftlClon nud to H..,, lido ll<<OIIIII, Mil tlle tlalp of d*,q,ronltH sl,olllll I# basetl 011 11,e JoUowlllg pHtwl COftC91$: (1) prov/4e rqm,p of '*'I"'* slu to be slllbk t1gabut tl,e tlalgn dorn, (PMI); (l) prov#M llll#fom, 111111/or gtnlk """° along "'*,q,ron ad 11,e 13 December 16. J 997

I I I I I I I I I I I I I I I I I I I Response to Nucleu Regulatory Commission Comments/White Mesa Reclamation Plan Comments Dated August 19. 1997 adjacent ground surface such that runoff is distributed uniformly at a relatively low velocity, mlnlmldng the potential for flow concentration and erosion; and (J) provide an atkqlUIU apron thickness (depth) to prevent underclllting of the disposal cells by: (I) local scour that could result from the PMF; or (II) potential glllly encroachment, that collld occur due to gradual 1,eadcllltlng over a long ~rlod of tllM. The key ele1Mnts which /UC needs to consider In the design of riprap protection for the apron/toe are: (1) the downstream portion of the apron/toe wl,lcl, Is assumed to have collapsed due to scour or long-term erosion; and (2) scour at the ground surface downstnam of the apron/toe. To account for the potential uncertainties In toe dalgn, the NRC staff suggests that II may be prudent to use several dlj/erent analytical methods to design the rlprap for these key elements. As part of tl,e analysis, /UC should assume that the natural ground downstream of the toe wUI be eroded due to cumulative local scour and/or erosion at Its base, resulting In the collapse of the rock Into the eroded area. To determine the depth to which the toe must be placed, II Is necessary to estimate the depth of scour which wUI occur to the nat11ral ground slope just downstream of the toe. The toe should then be placed at least to the estimated tkpth of scour. To f urtll~r document the acceptablllty of tke design of the rock todapron, ii may be very use/Ill for /UC to provide a geomorphlc report. Th't geomorphk bases for the design of the rock toe should be provided, including a geomorpldc evaluation of the pot,ntlel for formation of gullies. The geomorphic analysis may also document the depth of the gullies in the immediate area and help to justify the selection of a depth of scour. It should also be noted that rock toes are considered to be critical areas, and the rock quality criteria/ or these rock toes are not likely to be met by the proposed sandstone source. Use of rock of higher quality appears necessary (see Comment 2).

Response

Cell 2 South Slope A toe apron will be included where the south slope ofCell 2 discharges to the surface of Cell 3. This toe apron will consist of the same riprap size and thickness as is on the south slope ( see response to comment 17) and will extend outward from the toe of the slope for a distance of ten feet. 14 December 16, 1997

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[?* Cell 3 South Slope Response to Nuclear Regulatory Commission Comments/White Mesa Reclamation Plan Comments Dated August 19, 1997 A toe apron will be included for the south side slope of Cell 3 where the Dakota sandstone is not present at the surface. No other side slope bas either the dimensions (height and length) or nmoff to experience significant scour. The south slope toe apron will consist of the same riprap size and tbidtmsl aa is on the side slope (see response to comment 17) and will extend outward from the toe of the slope a distance of ten feet. The final padina plan will provide for distribution of runoff from the south slope of Cell 3, with surface padients away from established drainage courses so that runoff is not concentrated along pathways where natural erosion has caused gullying. This measure will deprive the existing gullies of most of the runoff that they had previously carried, arresting or sharply reducing the potential for futun, erosion. The toe apron will not be placed where the Dakota sandstone is insent at the surface. The bedrock provides natural resistance to gullying that is better than, or equal to, any scour protection using natural materials that could be constructed. It is evident, however, that the sandstone does erode and erosion cannot be absolutely prevented using sandstone as riprap or erosion barriers. For that reason, diversion and distribution of nmoff away from active gullies will be moie effective than constructing riprap toes below final grade. Commeat: (11) Review of tl,e calc11/atiolUl:spreadsJ,eets (Appendix F) for,,,e dalgn of die rock on the

silk slopa lndkllla that tl,ejlow lengtlu used/or tl,e daign o/t,,e :side :slo~ racA (275 feet) doa not lnclw the lengtJ, of the top slope tJ,111 wUI contrlbuu runoff to the side

slopa. Begl11nlng tit,,,. 11pper t11d of Cell 2 (11ear CeU 1), It tlp/¥tlff tJ,111 raoff from

~ 2 ""d J wUljlow 1011tl,Wlll'd/or over 1000 feet a11d dl.tcl,lll'ge down tJ,e :side slopa of tbe cells. Accordingly, tl,e rlprop In tJ,ae areas :siollld I# retlalgnetl,,a necasary, to acco11111 /or tl,e lncreaed flow le11gtl,s.

Response

The calculations have been revised to include the total flow path length of the top slope which will contribute nmoffto the south and east side slope of Cell 3, and the south side slope of Cell 2. The revised calculations are presented in Attachment S of this response. IS Docember 16, 1997

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I Response to Nuclear Regulatory Commission Commcots/White Mesa Reclamation Plan

____________________ Comments Dated August 19, 1997 The size of the riprap placed along the sides of the slopes was determined using the Stephenson method (NUREO/CR-4651). The side slopes are designed at SH:IV. Assuming that the on-site sandstone would be utilized u riprap material, with a rock rating of SS. 74%, the modified D50 size should be at least 8.0 inches. According to the Stephenson model, the riprap thickness should be at least 2 times the Dso value. This indicates a minimum thickness of 16 inches, with a suggested thickness of 18 inches, on the sides of the slopes. Comment: (18) Addltlolu,I Uf{onnatlon 1llould 1M provldtd for t/ft dalp of tJ,e se,U,.ntatlon basin ""d ti,* d&cll,up cllanntL HEC-1 analysis should* provuhd, lllong will, HEC-2 u,put 1111d o"1put dilttl (or otJ,er water 1,uf11et projlk 111111lysls), to doc*ment tJ,e accqtdlllty of JHlrtUMltn used In tl,e dalgn of,,,e rlp111p for tJ,e c"1111neL In addltlon, stdbntntatlon analyses,,,01114 1M provided to,,,,,,., tltlll die capacity of die se,U,,.ntatlon basin ls tukqlUM ad dull ti,~ HEC-1 rolltlnp tulqllllldy 11ecount for dtcreua Ill 1to111ge cllp(IC/ty ln tl,e balln du to se,U,.nt accllllUlltdlon owr a long 1¥rlotl of tu.. Flll'tl,a, tad of dlt JHUf""dtrs HStd to dalgn die rlprt1p ln tJ,e cl,anntl sllollld 1M provided, lncllUllng dlannd slope, wldll,, flow "*, ""d waur **rface proflla, particularly If flow ch""ga fro,n subcrltkal to s~rcrltlcal at so,- location ln,,,,. cJ,anntL

Response

Sedimentation Basin Following reclamation, Cell l will trap sediment over long periods of time and the storage capacity of the basin will decrease. However, the cell is not designed to serve as a sedimentation basin, it will simply collect sediment due to the physical configuration of the reclaimed subsurface cell. As Cell 1 is not designed to serve as a sedimentation basin, and the cell (following n:clamation) will not be related to the reclamation of the by-product cells, sedimentation mlalyses to detennine the long tcnn capacity of the basin was not performed. 16 December 16, 1997

~: : I I I I I I I I I I I I I I I I., I Response to Nuclear Regulatory Commission Comments/White Mesa Reclamation Plan Comments Dated August 19, 1997 Surface runoff &om the mill area, and immediately north of the mill area, will be routed through the sedimentation basin and ultimately discharged through the channel located in the southwest portion of Cell 1. The disclwge channel and riprap were sized to accommodate the PMF flood using the HEC-1 model, as stated on Page 3-8, Section 3.2.2.2 of the Reclamation Plan. Following reclamation Cell 1 will not contain by-product materiab and will not be related to the reclamation of the by-product cells. Therefore, the purpose (and size) of the channel is only to prevent excessive ponding within the cell area. 17 December 16, 1997

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....,._ to Nuclear.Replatory Coamiuloa / Wlalte Mesa MW Reclamation Plaa Comaeafl Received December 8, IW/ Soarce Material Uceue SUA-1358 Collulleld: (J) Tdllbl Jlldl/bllll* dull tlllfrqllDlda of 9..at, eolllrol (QC) tau propouil In tu ,.._,,_ pla 11tt '*'I"'* for t:lllllrOIJb,6 du flUlllty of du eo1Ulnldlo11 of 1111 jbud ..,,_.u/J. Tat 1'u Nll.C "SIi,// Tdlllal PO$/tlo11 (STP) o* Totblg tuUI l,up<<tlo,, Pltuu Darb,g Coutnu:tJo,, of DOE'* /lOlldlld Adlo11 Ill I~ Urabun M/JJ Ttdlb,p Sita" (NRC, JIii),nm4a r<<OIIIIIIOIIW fntlllllda for (lC tao for """'1,a ptU'tlllWlen '"""* du COIUlnldlM of llllllq6..,,,_ al& NllC luu folUUI du frqllalda ~ In 1111 STP tl<<qltliJk for """"""111g die 9..uty of tu eoutndlon lldlP4tla for boll, Tltll I tllUI Tltk H 611a. In Ml/lie eaa, 11,e staff r<<ollUIIDUb In tJ,e STP COIIIIIU:lillg 1111 QC tall lllmY Jr,qllally tJuu, /USA ios pl'tlJIO#II in tlu redtunllllo11 pla. T/,e reco1111M11Md tat fmlllltllda for 6J¥djk (lC tao till prDYilld In tJ,e /olJDwing R<<ollllllDUllld,u for Tadn1 Freq11enq Fld4Daulty Mbrin,11111 of one tat pa J,(J(J(J ytl' of contamlnllled material. tuUI Molst11re Toa MbrUIIIIIII of one 14:t pa SOO ytl of otJ,u eolllp<<led llllllerial lndlllllng uq,tl6e INlrrler ad/or rllllDn barrla art/, cown. Min,_,,,, of two la* for elldl lil,y "'"'"" IIJIPttdabk 11111011nt of JUI tr pl<<d (In au. of J SO ytl'). M"""'- of Olle tat pa lift ad Ill /eat mu tat for nery full sllift of a"'fNIC*tl opm,tio,u. C**p,,:dot, 0-pollll "'1dor tat* 11 fml11111cy of 011e tat for every jive /kid T.,. tllll,lly lo& ~dy 011e """""""7 CIHllplldlon Clll'Ve IHIMd o* comp/de hod# lalafor nay JI or JS /kid tau, tlqaullng on tJ,e varlol,illty of II December 16, 1997

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I Response to Nuclear Regulatory Commission Comment!/White Mesa Reclamation Plan Comments Received December 8, 1997 G"""1tlon 11114 Mlnilll11m of ou tat per 1,000 yd' of nulonlsupage barrier material, O.Uljlatlon 11114 ou tat per 2,000 yd' of otJ,u engll,uml soUflll llllllerilll.

Tot, For Ill/ ""'*""1s otier tl,1111 r1111tlo111 flll 111111 conllllnlnate4 materiab, Ill last one '°"""'n tat *,,ollld be r1111 for eadl uy of slgnJ/kant llllllerilll plaeelllelll (In eJtU$$ of l SO yd').

Attaber, UIIIJt At least 011e tat for eaci tlay of slgnlf1C1111t co,,esiff cover or liner Tao lllllterlal p/11<<,Mnt (In eua.r of 1 SO yd'). Rod DIU'llbllJly For any type of rlpn,p..,,,ere tlle vol111M a grater"'"" 30,IHJ(J yd', a tat Tab serla.,,ollld be per/onne4 for eac,, lllltlltiona/ l 0,000 yd' of rlprap delmred. /UC *,,o.,,d adopt t,,e freqwncla reco1111Mnded In tie STP, or a/umately, present a tec,,nlcal j11,1tijlcation tl,at tl,e freq11encla of QC tats proposed In tie recllunatlon plan tue tuleq1111U for controlling the qlllllJty of constrlldlo11 of tlle f111al dJsposa/ ce/L REFERENCE NRC, 1919, "SIii// Tec,,nlca/ Posldon on Testing 1111d Inspection Plans D11rlng Constr11ction of DOE's Re1Mdial Action Ill Inactive Uranium Mill TaHing Sita," Revision 2, Jan11ary 1989.

Response

At this time technical justification that the proposed QC testing frequencies are adequate for comtruction, should not be required. The testing frequencies, presented within Attachment A of the Reclamation Plan, are intended as a rough outline for the fonnal construction specifications that will be~ prior to reclamation. The QC outline, although not detailed for construction, is adequate for determining the QC cost estimate. It is clear that the NRC "Staff Technical Position (STP) on Testing and Inspection Plans During Construction ofOOE's Remedial Action at Inactive Uranium Mill Tailings Sites" rigidly provides conservative QC testing frequencies adequate foi controlling construction quality. However, the STP does not allow for site specific conditions whid1 may exist. Jn order to plq>lft the fonnal QC specifications a pre-construction laboratory testing program will be performed, immediately preceding the reclamation construction, on the proposed random fill and riprap materials. This additional testing, along with the current laboratory data fiom the Section 16 19 December 16, 1997

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<21' I a,.,... to Nuclear Regulatory Commiuion CommeatslWhite Mesa Reclamation Plan Comments Received Decanber 8, 1997 clay IC>IRe, will povide the information required to establlilb the site specific QC testing fiequencies adequate for controlling the quality of construction. The following chart briefly 8IIIDID8liz.es the site specific conditions that will be utiliad to detamine the QC testing frequencies: Tat Tenbl1 Jnqaeacy Determiaatiom Field Density and Variability of the materials optimwn moisture content and maximum dry Moisture Testing density: Highly variable soils will require conservative field control. Conversely, consistent soils may require less testing than recommended in the STP as consistent compactor coverages will yield consistent results. Volume of fill materials: Large swface area fills, such as the top of the tailings cells, require less tests per cubic yard compared with small swface areas where rapid lift placement occms. Topography of the fill area: Fill placement on slopes, and tight corners, require additional tests as compaction equipment movement is hindeml. Compaction Tests Variability of the materials optimum moisture content and maximum dry density: Highly variable soils will require conservative laboratory control to properly identify the materials in the field. Conversely, consistent materials may require less testing than recommended in the STP as field control testing will be less conservative. If variable soils are encountered one point Proctors may be valid. However, if distinct visible variations are pmlCllt within the various soils one point Proctors would not be necessary. Additionally, if consistent materials are encountered one point Procton will not be valid. Gradation and Gradations will be necessay for soil classification pwposes. However, Classification gradation specifications for the random fill and clay layers are not Tests included in the Reclamation Plan. Therefore gradation testing should require less testing than recommended in the STP. 20 December 16, 1997

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!} ~,. ,I I I I I I I I I I I I I I I I I I Atterberg Limit Tests Rock Durability Tests Response to Nuclear Regulatory Commission Comments/White Mesa Reclamation Plan Comments Received December 8, 1997 Atterberg Limit tests will be required for soil classification purposes. However, liquid and plastic limits are not specified in the Reclamation Plan. Therefore Atterberg Limit tests should be less than recommended in the STP. Number of bormw areas: The testing frequency will be dependent upon the number of sources utiliud. Each source should have at least one test. Following additional laboratory analysis, the construction QC site specific specifications will be established to control the quality of the construction in accordance with standard industry procedures. However, at this time the QC outline is adequate for the QC cost estimate. Comment: (2) AddltlolUII lnfol'ltlllllon addressing delllils of di.rposal cell constrllCtion. This information should incl11de: Methods, procdlll'O, tuUI nqllinments for excavating, llauling, stockpUing, and plllclng contaminated and non-eontaminattd materials and other disposal cdl lllllttrlals.

Response

The comment as stated indicates the reclamation plan includes the construction of a disposal cell. However, materials disposed during the reclamation will be placed in the existing tailings Cells 2 and 3. Contaminated materials to be deposited within the tailings cells consists of raffinate crystals, synthetic liners, contaminated soils, and decommissioned mill equipment. The placement of these rMtcrials is discussed in Sections 2.0, 3.0 and 4.0, Attachment A, of the Reclamation Plan. Non-contaminated materials to be placed within the tailings cells consists of the ftnal cover materials. The placement of these materials is discussed in Sections 5.0 and 6.0, Attachment A, of the Reclamation Plan. The excavation and hauling procedures for these materials will be the responsibility of the contractor. As per industry practice, the contractor may use any type of equipment he may desire, provided the equipment is in satisfactory condition and is of such capacity that the construction schedule can be maintained as planned. It is not expected that materials will be stockpiled during construction. 21 December 16, 1997

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1~- 1 I I I I I I I I I I I I I I I Respcnse to Nuclear Regulatory Commission Comments/White Mesa Reclamation Plan Comments Received December 8, 1997 Mlllmill p/1,u,nmt and collfllldlo,, pt'Offll,,ra (e.g., lift hi664 COllfJIIICIM effort) lo eilffe ti,~ tlairt!ll 11tOlst11tt conunt, p11,a,-n1 daully, ad pu,,,ablllty.

Response

MaleriaJ placancnt and compaction procedures will be developed by the earthwork contractor. The Quality Control testing (moisture content and dry density) will be used to verify that the specified moi.stule content and percent compaction is being achieved with the contractors chosen equipment and procedures. The earthwork contractor will be required to place and compact the soil materials within the maximwn lift thicknea, percent compaction, and moisture content specificatiom presented in Table A-S.3.2.1-1, Attacbment A, of the Reclamation Plan. The lift thickness.ind number of compactor passes required to conform to the soil placement and compaction specificatiom will b.: dependent upon the actual equipment utilized during construction. The contractor may use any type of earthmoving and watering equipment he may desire, or have at his disposal, provided the equipment is in satisfactory condition and is of such capacity that the construction schedule can be maintained as planned. To determine that the moisture content and percent compaction requirements of the soil material is being met Quality Control field. and laboratory tests will be conducted at specified intervals as presented in Section 7.4, Attachment A, of the Reclamation Plan. Furthermore, Quality Control observation will be performed to ensure that the maximwn lift thickness is not exceeded during soil placement. 22 December 16, 1997

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ATTACHMENT I "Letter Report Seceioa 16 Cla)' Material T*t Data

. White MIia U,..w Project Blaadlaa,Utn" ,.,.,and by D' Appolonia Cwulttaa Enpraeen, lac. Dated Marc* 8, 1982

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CONSULTING ENGtNEERS. INC, Mar.:h 8

1982 Project No. RM78-6823 Kr. B. R. Roberti Eneray Juel, Nuclear. Inc.

1515 Arapahoe Street Three Park Central, Suite 900 DenveT, Colorado 80202 Letter llepart Section 16 Clay Material Teat Data White Me** Urani1111 P~oJect llandina 1 Utah

Dear Harold:

Thi, report pre1ent1 the reeult* of field inveatigatione and laboratory te1t1 perfor.ed on Se~tion 16 clay aaterial. The aateTial teated vae obtained from borina* and teet pita made in April 1979. The laboratory teat* vere performed and the data retained in OUT file, until your recent requeet for the data. Field lnveeti1ation1 The area of inveatigation i1 a canyon located in Section 16, about three miles eouth of the aill eite. Seven boring, were dril~ed ** part of the field iaveatigatione. Theae boriage, 100 through 106, are located approximately as ebovn on Fiaure 1. The boring* vere drilled with a rig provided by Energy Puel1 ueing che rotary .. thod vith air pre11ure to fluah out the cutting*. Saaplea were obtained by a.. pli111 the cuttiaa* on five foot intervala. Only qualitative information on the aub1urface aateriala i* available becau1e of the aetbod of drilling and 1.. pli111 utilised. Bovever, the qualitative information and eaaple1 obtained are *uitable to provide in*elillinary data on the character of the aub1urface .. terial* preaent. Three t~et pit* (1-3) lfttre excavated to obtain bulk 1aaple* for laboratory te1ting. The location of the teat pit* ia ahovn on Pigure 1. Saaple* froa Boring 2-16 drilled by E111r1y Puele in November 1978 were al,o p!'ovided to D'Appolonia for te*tiq. The location of Boring 2-16 i8 ahovn on Piaure 1. 7'00 SOUTH Al.TON COURT, INGLIWOOD. CO I0112 TELEPHONE: 3031771-3484 IICK\\.EY, WV CHESTERTON. IN_ CHICAGO, IL HOUSTON. TX PITTUUflOH, PA WIUIINQTON, NC IAUSSEL8, IILGIUM TELEX:4S-456S LAGUNA NIGUEL. CA SEOUL. KOREA

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I I I Mr. H. R. Roberti 2 Mar.:h 8, '.'182 Subaurface Condition, The aub1urface condition, in the canyon, baaed on the boring data, are ahovn on Croat Se~tiona A-A' aad 1-1* preaented on Pi1ure1 2 and 3, reapectively. The plan locatiou of theae croaa aectiou ii ahovn on Pi.sure 1. A1 abovn on the croao aectiona, the aubaurfice conaiata of a aurficial layer of red clayey and 1ilty aand about five feet thick. Tbe uaderlyiag aaterial i1.ao1tly a red or aray ailty clay. The con1i1tency of tbe ailty clay layer varies from 1tiff to hard, baaed on ob1ervationa of the driller, and ria du~ina drilling. A leaae or layer of very bard ailt vaa noted in lori11& 10S. Thi* layer appe8r1 to be a well c*ented unit froa the cuttiaa 1aple1 obtained. In Boring 106, the aurficial 1&nd layer wa, about 20 feet thick and a clayey aaad layer va1 alao encountered at

depth of about 30 feet.

The laboratory 1oil cla11ificationa for the teated 1aaplea are al10 ahovn on Croaa Sectiona A-A' and 1-1*. The teating proaraa is di1cu11ed in detail in the following eection, however, the te1ting re1ult1.indicato that the ailty clay layer i* 1101tl7 a CL or Cl aaterial with one aaaple being a SM and r:vo a ML. Theae te.at re1ult1 1hov tbe aaterial ia basically a fine grained 1oil with a varying aaount of ailt and clay aiae particle,. The plaaticity characteriatica of the uterial vary froa low to high. Purther diacuaaion of the teat re1ult1 and aaterial characteriatica is given below. Water in the bo~iag1 va, not noted except for Boring 104 for which a depth of about 43 feet tt:*1.:is aeaaured. Tbi1 depth i1 not conaidered coapletttly reliable aince it waa aeaaured only one day after drilling and the water level aay not have bad t me to e tab il iae. Laboratory Teat leaulta The laboratory te1tiag proaraa conducted on,ample* from the borings and test pits included the folloviag typee of teata: o Claa1ification Crain 1iae. 1ieve and bydrOll8ter Atterbeq liaitt Specific ara~ity o x-a.y Diffraction o Cat ion lxchange Capacity 0 lxchaaaeable cation, o Modified Proctor Coapaetion Denaity o Peraeability The re1ulta of the cla11ification teats are aiveo on Table l. The soil cl.aeeificationa given are ahovn on Cro11 Sectiou A-A' and 1-B' (Fi,uree 2 and

3) and vere diacu1aed above.

WAPPOLONIA

( j; I I I I I ,1 i, I I I I I' .r.,. f,* '( Nr. H. R. Roberti 3 Mar.:h 8, 1982 Tbe cation exchanae capacity (CIC) and exchangeable ions vere conducted to evaluate tbe type of clays present and the chemical effects reaulting from contact with the taili1111 liquid. Teet* were rlll', on saaples from Test Pita l a~ 3 saaplea aad lorioa 103 (15-20 foot depth). Soil from each 1aaple was treated by aoakina in 1iaulated tailing, liquid for 48 hours before teating. loth treated and untreated (as received) *maples were te1ted and the re1ults are pre1ented on Table 2. Re1ult1 of the testing are summarized as follows: o The untreated 1aaple1 indicat~ pH (1:1) ~*lues between 7.40 and 8.35 with CIC values in tbe 45-56 aeq/lOOg ra111e. Tbe predominate exchaqeable ions are calcium and 1odi1111 for Te1t Piu 2 and 3 and calc iua and aaane*iua for Boring 103 (15-20 ft). o The treated... plea indicate pB (1:1} values between 1.70 and 2.35 with CEC value* in the 90-100 meq/lOOg raage. The predoainate exchanaeable ion* are hydro-aen, calcium, and aagneaium for all the samples. These reaulta indicate that expo1ure to the tailinaa water cau1es: the pB (1:1) of the aaterial to decreaae. the excbangeable*bydrogen and aagneoium to increase.

the exchangeable calcium and aodium to dec=eaae
the CIC to i~crea1e by a factor of about two. due primarily to the large increaae in exchangeable hydroaen.

The effect* of theae change* on clay material properties, particularly penaaability, ia diacuaaed in the following paragraph*. The I-ray diffraction teat* were lt'UD on aaterial frC111 the aaae three ***plea at. teated for CIC and exchanaeable iona. The x-ray diffraction teating waa conducted to evaluate the type of clay mineral* occurring in the 111&terial. Tbe reaulta of the te1ting are given on Table 3. A* shown, about 50 percent of the aaterial i* quarts, 25 percent montaorillonite, 25 percent illite, and miDOr percenta1** of other mineral,. Montaorillonite ia an active clay aiaeral which typically ha1 1 lov coefficient of permeability. Illite ia alao a elay mineral, but it it typically relatively inactive with a aoa:~vhat higher coefficient of peratability. Modified Proctor compaction teat, were conducted on four different *-plea. Teat Pita 1 1 2 and 3 aaaples ware teated and a composite aaaple from Boring 2-16 (85 to 210 feet derth). The re1ult1 of the aodified Proctor te1ts are 3lven on Table 1. The averaae aaxiaua dry denaity measured i* 107 pound* per cubic foot and the averaae optiaua water content ie 17.5 percent. f rr

j.,**

*,§., '

I I I I I I I I I I I I I I I .1 ,:I Mr. R.R. Robert* 4 Mar.:h 8, 1932 Permeability tests were conducted on compacted 1aaples of material from Boring 2-16 (coapo1ite 8S-120 feet). Boring 101 (coapoeite 0-25 feet}, Boring 103 (coapoaite 0-25 feet) and Teat Pit 2. The teats vere conducted in perme-ability cells with a confining prea1ure applied around the aaaple which is encaaed in a rubber aeabrane. A differential pressure was applied acro11 the a.. ple and flow of fluid through the aaaple measured. Both distilled water and. 1iaulated tailings liquid vere u1ed in the te1t1. The teats on Borings 101 and 103, and Teet Pit 2 were conducted over a period of about five months to**~*** the effect, of tailings liquid on the permeability of the .. terial. The teat, were conducted with di1tilled water for about two a>nths to eatabli1h saturation and 1teady *tate flow. Tailing* liquid was then introduced to the aaaple and the teat continued for three more months. The re1ult1 of the permeability tests are pre1ented on Table 4 along with other pertinent 1aaple data. The ~~erial has an average coefficient of 1germe-ability with water of 3.3xl0-centimeter, per 1econd and 5.lxlO-centi-aeter1 per 1econd with 1i.aulated tailing, liquid. The teat result, indicate that the permeability of the material was e1aentially the same with distilled water and tailings liquid and no degradation of the material was indicated. Conclusions and Recoaaendations Baaed on the field and laboratory investigations di1cuaeed above, conclusions which can be aade regarding the materials in Section 16 are: o The material is a>1tly a silty clay (CL to CH) with alight variation in properties. The clay ainerals are mo1tly aontaorillonite with some illite. o The material varies laterally with eoae layers or len1e1 of 1and and eilt. The con1istency of the aaterial alao varie1 from 1tiff to hard or very hard. o The penaeability value* of the aaterial are very low and long-tera permeability teats conducted with

illulated tailing, liquid indicate little c~ange in permeability with tiae. Thia re*ult is in good agreeaent with the result, of the CEC, exchangeable ion test* and x-ray diffraction test re1ult1.

o The clay material i1 1uitable for use as borrow for use a, a clay liner or in 1itu as a natural liner layer. lecOIE\\endation1 for further aa1e11aent of the clay for use a1 a borrow area or ic situ clcy liner aource are:* o Geotechnical boring, with eplit apoon 1ample1 to

- - - - the.. terial characteristic, aore apecifically, includiQI cooai1tency, natural water content, and c lauiification.

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I I I I I I I I I I I.,, t**:,.. Mr. H. R. Roberts 5 March 8, 1982 o Field peraeability te1t1 {falling or r1s1ng head) in the boring* to neaaure the in aitu permeability. o Installation of pi11&oaetera to determine the ground water level. Additional diacu11ion of the above rec01111endation1 can be provided as nece1-1ary depending oo your need*. ~u~~~~ Corvin I. Oldveiler Project Engineer CEO: par D"-PPOLONIA

I 111 'Ii I = II I .al = 1~ *= ii ii I t I f f I I f I I I I I I I I t I I t I I I f I I I I t f t I I I I I I I I f.. "' ti! i = ;; f f I I I I ~ I t I I t I I f I f I t t f I I ~ I f I I i 8 8 I - id I I I I Id,*d I I I I I I Id I I I I is ii=.. "'. '

as.-, ::;;a::;::....

i 0 ~... ... *.. = - 0 ~ I I..... I I I O I I I I I I I il i 0 91! ::: - I -" j .~ .1.

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~ *, a,* --, ~-~ f",. i*:r '.{.;. I I I I I I I I ~-~*: i_, , *I I I \\.., I ,{ "I .(: /:,,:,, b J,:,-., PAIWIITIR pl 0:1) Buffer pB l.xclulqeab le: R Ca Na Ila X Cat ion bchaqe Capacity (CBC) TABLE 2 CATION EICU..GI CAPACI'ff AID EICIWIGEABLE CATION T!ST RESULTS UNITS aeq/lOOg aeq/1001 aeq/lOOg

q/lOOg aeq/1001 aeq/lOOg UtfTUAT&D SAMPLES T!ST PIT TEST PIT BORING 2

3 103 8.35 7.40 7.60 MA MA RA 0 0 0 19.5 21.l 25.8 4.3 4.9 15.4 20.0 28.0 6.5 1.2 2.5 0.6 45 56 48 TREATED SAKPL!S(l) TEstcIJT T&sr PIT ao11NG 2 3 103 2.30 2.35 l.70 2.28 2.20 2.15 56.6 57.6 58.2 12.3 13.5 18.7 17.0 20.3 17.8 3.7 6.5 2.6 0.8 1.6 0.5 90 100 98 ~!~saaplea aoaked in aiaulated ta~linga liquid for 48 hour, before teating. llepreeenta triplicate re1ult1. D~LONlt

'I I I I I I I I I I I I I I I I I I

I

. **-r ~ ' ' " SAMPLE Teat Pit 2 Teat Pit 3 loriaa 101 (15'-20' Depth) TABLE 3 1-IAY D1F1L\\CTI0N SIMI-QUANTITATIVE RESULTS QUARTZ AIIDESINE tl>lft'MORILLOMIT! ILLITE MIXED LAYER 50%+ -5% 10-25% 10-25% 5-10% 50%+ 5-10% 10-25% 10-25% 5-10% 50%+ 5-10% 25-50% Trace -5% D~LONIA

'1111...... - SAMPLE IOIING/ DIPTR TIST PIT (PEIT) 103 0-25 101 0-25 2 2-16 85-210 2-16 85-210 TABLE 4 PERMEABILITY TEST RESULTS INITIAL OONDITIORS DRY DIIISITY WAT&R OOIITDT (PCF) (PIICllff) 116. 7 13.3 117.5 14.6 HO. 7

14. 7 101 15 110 15 COEFfiClllffS OF PIIMIAIILlTY WIT& DISTlLLID WITH TAIL111CS WATIR LIQUID (CM/SIC)

(CN/S!C) 1.2 X 10-g 9.4 X 10-lO 5.2 X 10-lO 7.5 X 10-lO 4.7 X 10-lO 2.J X 10-lO 1.0 X 10-lO 5.5 x 10-10

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REFERENCE TOPOGRAPHIC MAP 0 SITE. $H££T.. a/ otLANOING MILL SUAV£V$i INC., 12.. 8
7, LTA AERIAL I

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INTERSECTION WI CROSS SECTION 8 I BORING 102 T ML CL HARD, RED AND GRAY SILTY CLAY 8.0 8-47 8 0 B. -60 1 HORIZONTAL SCA.l 200 0 LEGEND CH - LA80RATORY SOIL CLASSIFICATION (UNIFIED SQIL CLASSIFICATION SYSTII ---*--------..---------------~~------~~-..-----------------------

I fUNG IOI CH APPROXIMATE EXISTING GROUND 'SURFACE REO,CLAYEY ANO SILTY SANO STIFF, R EO ANO GRAY SILTY CLAY "' ' \\. -..,,,,,,,,, -~ ~ ; ') I I A' 5180 5160 ~ 5140 I 5120 ~ ct 1----~--- W _J 5100 W 8.0.1 -40'

VERY HARO

? A~ii~~ ~E~:E~R:NO ANtnl1:c B 08. jPERT RE . 1£D SILT, CEMENTED VERTICAL SCALE ..~..... -

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20 NORTH) 0 20 FEET NOTES: I FOR PLAN LOCATION OF C"OSS SECTION, SU'. ,tGUfU: I.

2. VI.TICAL IXAGGlftATION IOOAU tOX

CA 080 5060 FIG ~RE 2 SUt!SURFACE CROSS $£(, TtON A*A' PREP4REO FOR ENEHGY FUELS NUCLEAR, tNC.

DENVER, COLORADO

-.:... o**.:., =l C ..,.,D ii C [ [ . f~ L r ': l.*.......,... ~- 11D I ll.. z.,.. Cm a: 0 B 5180 5160 5140 APPROXIMATE EXISTING GROUND SURFACE w w u.... z 5120 0.,_ <( w ..J IJJ 5100 CL 5080 5060 THI Ol"H ANO THICKNESS Of THE SU8SUAFACE STRATA INDttAllO 0.. Ttff SICTIOtlS WEIil GINIAALllEO FAOM AHO...... fiOt.ATIO anwut, THI TUT 80A1NGS ftiOAMA1'°" ON ACTUAL S"'88Vf!lfACE..CONOITtONS UIITS 0...Y Al T"( 1..0CAl'IO,. 0, THE TISI 80RtNGS Nl/0 ** 1$ flOls*u THAT SUIS\\dlFACE CONOlftONS llfWHtf THI lfST IORMlS MAY VAA't' FROM hi0Sf N>ICAflD 8.0.8. - 46 1

REO, SIL STIFF, RED AND GRAY SILTY CLAY HORIZONTAL SCALE 200 0

LEGEND: Cti - LABORATORY SOIL CLASSIFICATION (UNIFIED SOIL CLASSIFICATION SY

8.0 8. -47' VERTICAL SCALE 00 FEET 20 L 00 K ING WE ST} 0 20 FEET NOTES: I FOR PLAN LOCATION OF CROSS SECTION, SEE FIGURE I. 2 VERTICAL EXAGGERATION EQUALS 10 X. e* 5180 5160 5140 t-i.LI uJ

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z 5120 0 ANSTEC B 0. 8 APERTURE CARD MIO AYIIEl8 OIi ApertUnt.Clrd 5100 5080 5060 FIGURE 3 -t- <( > Lu ...J l&J SUBSURFACE CROSS SECTION B-B PREPARED FOR ENERGY FUELS NUCLEAR,I~. DENVER, COLORADO

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t !~ ATIACBMENT4 Spedflcatloa for Coaatnactioa of Rock Coven ad Otlaer Eroaioa Protection on the Tailiap Cella
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I 8BCiftCMICllf CCNnltJ.JmIOII or IIOCIC covna.MD O!IIIIR D08I0lf aonc.rIOM' ON TB !AU.DIG C11LL8 1.1 Project O..oript.ion (to be added)
The rock covers consist of two different covers:
a.
Top cover - A layer of rock covering all portions of the tailing cell tops, a surface with gradients less than 0.10. This cover will be not less than feet thick and will consist of rock with a dso not less than inches.
b.
Side slope cover - A two-part cover consisting of a lower -~foot thick bedding layer of dis not larger than and d50 not larger than and an upper foot thick layer of rock with a d50 not less than inches. -- Other erosion protection to be constructed includes:
c.
Side slope toe apron - A 10-foot wide extension of the upper layer of the !.i 1e slope rock cover along the side slope toes of the tailing cells. The rock to be used for the rock coven, and other erosion protection is sandstone. This rock will be obtained from ---- The work to be performed consists of loading and hauling the rock, placing the roclc on the radon barrier surfaces and toe apron surfaces, finish-gra~iing the rock cover surfaces. 1.2 d50
The size, in mean diameter, of the rock material of which 501 by weight is finer.
Earthwork control grid: Orthogonal s:,*stem of uniformly spaced lines (integer multiples of 100 feet), based on the coordinate system and survey control points to be established on the site, used to record locations, thicknesses, lateral extentfl, and types of earthwork performed each day. Fines: Mineral particles passing the 1200 U.S. Standard s.ieve; i.e. smaller than 0.075 mm grain size. foreign matarial: Any solid material that is not sandstone. Includes wood, iron and steel, plastic, rubber, glass, ceramic and concrete. JOCURC.Hl
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I I I I I I I I I I I I I I Job site: The location of the tailing cells as well as all access routes, borrow areas, equipment laydown locations and storage areas on Owner property used i~ the Included Work. Native soil, natural soil: Naturally-occurring alluvial or residual soils existing below and at ground surface around the job site; consisting of gravel, sand, silt and clay materials. Tailing cell: Cell IL or 13 Planarity: The degree to which a surface approaches a flat (but not necessarily horizontal) surface Sand: Mineral particles with grain sizes between 1200 and 14 sieve (0.075 mm to about 5 mm). Tailings: Solid byproduct of uranium ore milling, consisting of particles of primarily silicate minerals and containing radioactive elements (mostly uranium and radium). Particle sizes range from clay (less than 0.002 mm) to medium sand (less than 140 sieve). 1.3 Liet or Conetruction Drawing* The following drawings are incorporated into this specification by reference: (to be added) 1. 4 Included Work The activities required for rock cover and other erosion protection construction will be performed by the Contractor using its own or subcontracted labor and equipment. The Included Work, described in detail in Part 2, consists of: a) Preparation of haulage routes b) Rock placement: Lo,:iding, hauling and placement of rock for rock cov~r layers, riprap and toe aprons c) Scour protection trenches: Excavation and backfilling of soil; loading, hauling and placement of rock for construction of scour protection trenches, if required. d) Oust control: Operation of water pumping, distribution and spray systems to suppress fugitive wind-blown dust in all work areas. 1.5 R.elat41d Work Per~oDMld by Other* a) Earthwork quality control: fampling and testing to verify rock properties at the quarry site and gradations and thicknesses of placed rock b) Quality control surveying: Surveying for verifying line and grade and for pay-quantity determination. lOCUPIC.993
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a) International Uranium Corporation,or IUC, the "Owner", will provide controlled access to the work
site, will make available construction water at locations on the mill property and will approve and make payment for work performed under this specification.
The Owner will perform surveys to verify rock properties, to measure gradations and thicknesses of placed rock, and to verify finished lines and grades and placed-rock quantities. b) "Engineer" will review or inspect and advise the Owner on the acceptance of the Included Work. The Engineer will specify and review quality control measures. c) Contractor shall provide all equipment, materials, labor and supplies and perform all work necessary to accomplish the Included Work. Contractor shall be responsible for the knowledge o! and compliance with all applicable federal, state, and local laws and regulations and for the safety of its job site and of all personnel and equipment which it employs anrl all others who are present on the job site. Contractor shall be responsible for limiting size segregation of rock materials during hauling and placement controlling thicknesses of rock layers, and achieving specified lines and grades of rock layers and finished iock cover surfaces. PART 2 - SDCUTION The Contractor shall perform the following work: 2.1 Haul Route Pr9pa.raUon and Naint..mance The Contractor shall select, prepare and maintain one or more haul roads from the rock stockpiles to the tailing cells. Preparation shall include:
a.
Clearing of vegetation and removal to an on-site disposal location approved by the Owner. Vegetation may be burned in lieu of removal for disposal.
b.
Preservation and protection of wells, water lines, and power lines needed for water supply or for the Owner's ground water restoration.
c.
Preservation and protection of pow~r lines, telephone lines and other utilities along rights-of-way crossed by the haul route(s).
d.
Hauling and placement of soil or rock to construct the haul road surfaces. The Contractor may use any rock or llOCllSPSC. H 3 soil it deems appropriate for U.is purpo:,e. If the source of the rock or soil to be used is located on the Owner's property, the Contractor shall identify the location, types and volumes of material needed, submit a plan for regrading and revegetation of the borrow location, and obtain the Owner's approval before using that source.
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~ ;':, ',\\ e, Maintaining the haul road(s), including dust control, for the entire period of use.
f.
Regrading and revegetation o ~ both the haul-road construction material borrow site and tht: t.. aul road(s) in accordance with a plan prepared by the Contractor and approved by the Owner. Fences may be temporarily removed where they cross the haul route (s) provided that if any license-boundary (~ecurity) fence is breached, a quard shall be posted at each such location during working hours and all such openings shall be closed during non-working hours. 2.2 Loadj09, Haulift9 and Pl~t o~ Rock The Contractor shall load and haul rock from the stockpile at ____, designated by the Owner, to placement locations on the tailing cells. All r.ock used for rock covers and erosion protection shall be sandstone from --------------- 2,2.1 Rock Cover* Rock covers shall be 90%-125% of the following thicknesses: cell top cell bedding (side slope) cell side slope feet --feet --feet A bedding layer will be placed on all side slope surfaces before placement of rock cover or riprap on those surfaces. Rock for covers shall be loaded, hauled and placed by mothods that maintain the gradation ranges in the stockpiled rock and prevent segregation of sizes during transport and placement. The rock shall be placed and spread to create a uniform surface on the rock cover that is free of visible high or low spots. The planarity of the surface will be acceptable if irregularities of the surface do not exceed+/- 1.0 feet vertical difference from the design gradient surface over 100 feet and+/- 0.5 feet vertical difference within any 10-foot segment of a 100-foot survey line. On the rounded corners of the tailing cells this irregularity criterion shall apply along radial lines down the slope, perpendicular to the elevation contours. 2.2.2 To. Apr~~ Along the south side slope toes of the tailing cells, the rock cover will be extended 10 feet beyond the toe of the side slope, as shown on Drawing This toe apror. will consist of the same rock sizes and gradations as the side slope rock cover and will be constructed so that the surface of the toe apron slopes away from the toe and the outer edge of the top surface is at the same elevation as the adjacent ground surface.
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2. 3 Duet Control The Contractor shall employ those measures necessary to minimize dust from its operations.
Unless otherwise approved by the Owner, acceptable measures are limited to spraying or other method of applying water to ground surfaces. The Contractor shall take all measures necessary to achieve all requirements of rart 2 of this specification. These measures shall include, as a minimum, the following: 3.1 luper,,iaion During all timfJs that the Contractor's equipment or personnel are performing Included Work on the job site, the Contractor supervisor shall be present to direct the work. The supervisor shall have experience, satisfactory to Owner, in the type of work being executed. The supervisor shall have
--hand at all times a copy of the current revision of this specification and the drawings relevant to the work.
The supervisor shall have the authority to make decisions for the Contractor in all matters related to parts 2 and 3 of this specification. 3.2 Line and Oracle and P1anarity Control The Contractor shall perform land surveying to determine that the specified lines and grades and planarity have been achieved in accordance with the limits established in this specification. Ground control for surveys shall be based on established benchmarks and other control points on the mill property and tailing cells as shown on Drawing Gradients shall be surveyed as often as necessary to control rock placement. If any part of the ror:" layer surface appears by visual examination of the Owner to exceed the planarity limits, that part shall be surveyed to quantify the magnitude of irregularities. All final gradients and elevations shall be recorded on base drawings that include the sire r~ordinate system, the earthwork control grid, and the topographic contours ~t the surfaces prior to fill placement. Base drawings will be provided in hard copy or Autocad (current version) plot file on 3.5-inch diskette. When the Contractor reports to Owner that all Included Work has been completed, owner will perform an acceptance survey to determine if line and grade requirements have been satisfied. OWner will survey the elevations and gr*adients at such locations as may be necessary. At its discretion, OWner may choose to have this survey done by aerial photogrammetry. 3.3 rield and Laboratory 'l'**tin9 of Rock and Rock Plaoaaant Testing of rock for the necessary properties and gradations will be performed on rock in the stockpiles at the quarry by a qualified materials testing service contracted by Owner. The Contractor shall have no responsibility for the rock until it removes rock from the stockpiles. The testing service will perform measurements and tests to determine size gradations and layer thicknesses of the placed rock according to the following frequencies: llOC:UKC. 993
I I I I I I I I I .11 I I I I I I ~* t~ fr1** ~r-1\\ f,
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a.
Visual inspection of rock delivered to the site and rock placement will be performed at least once daily.
b.
Visual inspection of rock cover surfaces will be performed at l~ast once in each control grid cell ( 100 feet x 100 feet) to evaluate surface uniformity and planarity. If the visual inspection results in uncertainty or dispute about adequacy of planarity at any location, the location shall be surveyed by rod and lbvel, or other method of at least equal accuracy, to determine if al!~wable limits of surface irregularity are ~xc0~ded along 100-foot l~ng horizontal and 20-foot slope-gradient lines of a 20-foot square grid covering the location in question. The allowable limits are + /-
1. 0 feet vertical difference from the aesign gradient surface ov£r 100 feet and+/- 0.5 feet vertical difference within any 10-foot segment of a 100-foot survey line.
This requiremem: does not negate or substitute for rock thickness testing required below.
c.
One size and gradation test using a portable screen stack shall be performed for every 5000 cy of rock or bedding placed on the Tailing cell.
d.
Rock and bedding layer thicknesses shall be measured at least once per 2000 cy placed. ,.1 - DoCNIMlntation by Contractor The Contractor shall record and report, in a format acceptable to Owner, the following information: Daily journdl containing list of equipment
used, hours

worked, reimbursablf! materials consumed or

used, and labor hours by wage category.
The journal will also record Included Work tasks started, completed, and in progress and the uni ts of work accomplished (e.g., volume of rock placed, area of final grading). Submit a copy to Owner by the start of the next working day.. Daily Work Summary listing all pay items and quantities. Submit by the start of the next working day. Earthwork Control Plot, using the earthwork control grid at a scale of not less than 1 inch* 200 feet, showing the location, area~ extent, and thickness of bedding or rock material placed accomplished each day. Survey notes for line and grade and planarity control (verbally report results immediately, and submit copy to Owner within 24 hours) Wdtten notifications to Owner of unexpected conditions, conditions that prevent conformance with specifications, disputes over acceptance of Contractor's work. Verbally notify Owner inunediately upon discovery or identification, submit in writing within 24 hours. NJCUHC,993
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OWner will create and a.int&in the following docuaentation that relates to the Inclw.s.ct Work: field inepection notes of Contractor*s performance, work acc011plished, and obaer,ed veriencea frcat the specification. Ritcorda of all field and laboratory tests performed by Owner and its testing eervice. Photographic and video tape records of the Included Work. Chronol09ical record of notifications to the Contractor of variances from apecl.ficationa, unacceptable work performance, discrepancies in payment quantiti.. claiaed by the Contractor, and all related resolutions th*.teto. Survey notes and calculations of the acceptance survey Aa*buUt drawings of completed work OWner shall have sole discretion to accept in part or in full, or to reject in part or in full, the Contractor'* work. Acceptance or rejectlon will be based on Owner* e visual inspections (including those of its Engineer and testing aervice), quality control data required under Part 3, and documentation required under Part 4. Upon identification of unacceptable work, OWner will notify the Contractor of the deficiency. The notification will include the location,
extent, and description of the unacceptable work.
Before proceeding with additional work at that location the Contractor shall correct the deficiency by bringing the work into compliance with specifications and drawings to the satisfaction of owner. All work and materials required for such corrective actions shall be at the expense of the Contractor. Complete the Included Work by (to be added) days from Notice to Proceed.
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ML20015A360

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Dear Mr. Holonich:

Dear Mr. Holonich:

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Dear Harold:

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ML20015A360

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Dear Mr. Holonich:

Dear Mr. Holonich:

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Dear Harold:

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