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Home My WebLink About20111436 Varra Companies, Inc. Office of Special Projects 1431 East 16th Street Greeley, Colorado 80631 Telephone(970)353-8310 Fax(970)353-4047 Thursday 9 June 2011 Weld County Clerk to the Board 915 10th Street,3rd Floor Greeley,Colorado 80632 Subject: Varra Companies, Inc.—Western Sugar Reclamation Land Development Permit— Regular Impact(112) Technical Revision Application —Permit M-2010-049 Materials submitted to the Colorado Division of Reclamation Mining and Safety (CRMS)—Office of Mined Land Reclamation (OMLR): • Correspondence of 6 June 2011 from Varra C.G.R.S. to the Colorado Office of Mined Land Reclamation,with attending map. Attachments: 1 Proof of Placement of this material with the Weld County Clerk to the Board. 2 C.G.R.S. Correspondence of 6 June 2011. 3 Revised Figure 1 (Exhibit C-1 Map). Your signature below acknowledges receipt of the above referenced material, as attached. The material should be added to the above referenced Application, as originally submitted to the Weld County Clerk to the Board,and made accessible for public review. Received On JQtt to, 71) ,2011 By ter-C77r17 Office of the Weld County Clerk to the 1k rd of County Commissioners C ?wdt� Rit_x)kv.A3 PL Varra Companies, Inc. WESTERN SUGAR RECLAMATION LAND DEVELOPMENT PROJECT 1 OMLR Permit—M-2010-049 2011-1436 CGENVIRONMENTAL flAWO©Lg June 6,2011 Division of Reclamation,Mining and Safety(Division) 1313 Sherman Street, Room 215 Denver,Colorado 80203 Attn: Mr. Michael Cunningham RE: Varra Great Western Sugar Project Response to Division Letter DRMS File No. M-2010-049—Review 5 CGRS No. 1-135-12539aa Dear Mr.Cunningham: I have been authorized by Varra Companies(Varra)to respond to your review comments of June 1,2011. Item 1 — The Division is requesting that the applicant establish a "Trigger Point" at which mitigation or the evaluation of mitigation will occur. As written, the Division's proposed criterion is not only impossible to comply with but also reflects its failure to recognize the basic fundamentals of groundwater hydraulics and totally ignores the purpose and content of the dewatering evaluation. The drawdown associated with such operations is not fixed in time or space and trying to impose a single limit is not appropriate or achievable as the drawdown will vary greatly across the site and exceed the Division's recommended criteria in close proximity to the mine face. Natural groundwater levels cannot be practically maintained in close proximity to mining operations. Obviously,Varra Companies does not have concerns regarding drawdown beneath its property. We propose that sentinel wells be established as close as possible to its property boundaries and the trigger point be used at these points. However,the Division should acknowledge that during mining of the southern tracts, and possibly other areas, that water levels will fall below the recommended trigger level. Both the Division and applicant should recognize that mitigation may or may not be required even if the proposed trigger level is exceeded or not. Varra also contends that its operations considers and maintains the hydrologic balance as required by the Water Resources Division. Item 2—The wells that are appropriate for Trigger Point monitoring are monitoring wells 1,2, 11 and proposed VCI wells 12 and 13. Well locations are presented on Exhibit C-1. Item 3 —We concur with the three month criteria. As significant water level changes can take months to occur we do not feel more frequent monitoring is warranted; however, we propose that off-site wells in areas of concern may be added to the monitoring program if access can be obtained.Areal extent, not frequency should be the issue of concern. Item 4 —When the trigger point is met Varra will increase its assessment of surrounding land use. It will obtain opinions from a qualified hydrogeologist as to possible impacts to surrounding P.O. Box 1489 Fort Collins, CO 80522 T 800-288-2657 F 970-493-7986 www.cgrs.com Mr.Michael Cunningham Western Sugar Project June 6,2011 Page 2 of 2 wells. Varra will attempt to obtain access to monitor off-site wells in areas of concern. If a complaint is received an assessment will be made as to the cause of the injury, if any. If any adverse impacts are the result of mining operations,Varra will implement the most appropriate remedy,which may include items a through d of this section. In all situations,the Division will be contacted prior to implementing any corrective measures. Item 5 — Varra Companies will continue to monitor water levels on a monthly basis and will Include these data in its annual report. Item 6 — Varra will commit to installing two additional monitoring wells at the locations presented on Figure 1. However, it should be noted that these wells will have little use other than verifying model results once mining approaches the southern mine face as water levels will be well below the Division's trigger point criteria. If you have any questions regarding this letter, please contact me at 970-493-7780. Sincerely, CGRS, Inc. Jo y L.Adams, P.G. Principal/Hydrogeologist I': • . N . 2 / .x4 ‘,..9l r l r rII • ta g J : r . 'II.- .s..S:,.- -a - • re,: -- (14 i V 5 f 4 • - ' ‘ \ ‘41/4 . -, • -4, - ' t st . ‘4, . '� • r i:LJiSi51 ... �✓rr . * w aril- I I • �,• N 7 �-� r ; zk4 .i : am♦ t � ,f I f - ., ; SI I . ict414, ... ; C ,tj . ",\•, ' . ,, - .,...L,n: ;:-17. ..r. '4,41': . >-"r. - ..... .r • . 1,•lc) Li 1 i s SSW 4 t 0 ! 1 Jy • _ RC• : r - Sri:•. / 1 y '1 � 3' 1•/ 4. * fie.. i C a L 1 F 99P1 r+►=met! 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I•H CGENVIRONMENTAL • • June 11,2011 Division of Reclamation,Mining and Safety(Division) 1313 Sherman Street, Room 215 Denver, Colorado 80203 Attn:Mr. Michael Cunningham RE: Varra Great Western Sugar Project Response to Division Letter DRMS File No. M-2010-049—Slope Stability Review CG RS No. 1-135-12539aa Dear Mr.Cunningham: The following provides responses to Mr.Cazier's comments. Item 1—It is our understanding that mining will not exceeded 45 feet in the northern tracts due to engineering issues and less valuable aggregate. Item 2(a) — The last sample obtained from boring 2 was in the transition zone between unconsolidated deposits and the Pierre shale. After conversations with Terracon, the geotechnical contractor, the upper portion of the last sample was used for the grain sized analysis and the lower portion was used for strength testing.The lower portion apparently had a much higher clay/weathered shale content. We used the values reported by Terracon which are reasonable for weathered shale. Item 2(b) —The values used were either reported by Terracon or in the absence of measured values we used table values provided by your agency. For the second soil layer varied across the site from silty sandy gravel to lean clay.To be conservative in our analysis lean clay strength and weight values were used.The table provided by the Division is presented as Attachment A. Item 2(b) — The model can run multiple simulations and then compares the results only reporting the most conservative result. One method can also be selected and I have provided the Spencer method output for an example (Attachment B). As can be seen the Safety Factor is less conservative than the Bishop method. Item 3—As we modified a previous report the reference was inadvertently left in. Item 4—We have labled the three Plates for reference and have provided color reproductions in Attachment C. Item 4(a)—The soils were not named in the original simulations.The model attempted to input names based on available data. We generated a color soil profile with an appropriate legend, which is provided as Attachment D. P.O. Box 1489 Fort Collins, CO 80522 T 800-288.2657 F 970-493-7986 www.cgrs.com Mr.Michael Cunningham Western Sugar Project June 11,2011 Page 2of2 Item 4(b) —A groundwater model was generated for a dewatering analysis and slightly flatter gradients were simulated near the river and steeper gradients near the mine face. From personal observations at other operational mines groundwater will daylight on the mine wall up from the toe of the excavation. The water table was drawn to simulate this condition and there is some artistic interpretation based on my 24 years as a practicing professional. However, simulating the water table near the exposed mine wall,weather accurate or not,will provide the most conservative analysis. Item 4(c) — The geotechnical report provided a range of values for the gravel deposits. The difference between the two simulations is that friction angles (4)) of 40 and 45 degrees were used for the poorly graded gravel as a sensitivity analysis. Item 5—Please refer to Item 2. If you have any questions regarding this letter, please contact me at 970-493-7780. Sincerely, CGRS, Inc. Joby L.Adams, P.G. Principal/Hydrogeologist ATTACHMENT A GEOTECHNICAL PROPERTIES STATE OF COLOFADO DIVISION OF MINERALS AND GEOLOGY Departrnent of Natural Resources 1313 Sherman SL,Room 215 Denver,Colorado 80203 DIVISION OF Phone:(303)866-3567 MINERALS FAX:(303)832-8106 & GEOLOGY RECLAMATION DATE: March 12,2003 MINING•SAFETY TO: Peter Wayland,Weiland G error y Sugnet,Inc. c,�„�,„o, Greg E.Walther FROM: Allen Sorenson ( ec taIve Director Ronald W,Cotta ny Division Director Suggested Conservative Soil Shear Strength Parameters for Stability Analyses Given that these strength values, in particular the residual strength value for the weathered bedrock, represent the worst-case for potential slope instability,any safety factor in excess of one should be protective of critical structures. CLAY,sandy,soft to stiff,very moist to wet,brown(CL): 0' =28 degrees c' =50 psf moist unit weight= 114 pcf saturated unit weight= 126 pcf SAND.fine grained,clayey,silty,very loose,very moist to wet,brown(SC,SM): • 0' =25 degrees c' = 10 psf moist unit weight=90 pcf saturated unit weight= 115 pcf SAND. fine grained,clean to slightly silty,dense,wet,brown (SP,SP-SM): 0' =31 degrees c' =0 psf moist unit weight= 117 pcf saturated unit weight= 130 pcf SAND&GRAVEL,fine to coarse grained,some cobbles,clean'tb slightly silty,very dense,wet brown (SP,GP): 0'=35 degrees c'=0 psf moist unit weight= 130 pcf saturated unit weight= 137 pcf WEATHERED SHALE,this is an over-consolidated stiff-fissured clay,so the residual strength values arc appropriate to the analysis: 0'= 14 degrees c' =0 psf moist unit weight= 125 pcf saturated unit weight= 142 pcf c.1acs\M'y DocumentAshear strength pnrameters.doc Ps ! ti « • i : lc, 1 O . .,,, ,, ,,,,, :,,, i: 1 . i- . .,I., • i ! ,,Hi , y �f o I a' 00000 f 1 d �. •apo�pp ! ` I O a _ ' n J((( • I' N i ... 6S.1 C; a 5 C 0 _.--_a C i• .. . .. 1. ! z - p '� r)co ul co o j.!..c w • ql1 .0 M N v CO 1-'lJ {' •. O -, W • 117 CII C4 ! C qq n S �.3,3 ._ I `'r C i BI - � „ N i< . 1 ° •• • s •. ; C ;. • CO ( ,1 ' w L_ Q } i;3 Yi f i H- ri -' I s Yi (CAI j I • • =r ,o 4 ! �3 : : j`I • .! a o L,) 3 • _ • us ` I I i J N Z s ,_ --. .__._1 . I o ,c 33 E • co k O Z IF.t3 O G G p �iJ�j i'.4I • f C ] % Vl I.6 in n u; i F • 0 . n :• , E • SJ.i - g .s.. .. . . .... . . .. .. �- 'N :;. •• q .• " a.: 4 G 1, •••• 3�. 3 t si r- ""6:."40-....."- U fl. ' , in a a - E1 t' � aI k U • ''• fiJ G Fj rl !I o c y1 a , of a b u c,ic :i% — N C In 11 n 7 63 m, a w a. ¢. O wob N C 47 flu m w �I ! .M V• oa�s a7Q a_ 9 }7 `� r ,i•' .ere.» V 1� f - i ,•4 M ._ C ,.'5 .,'�a .°tl• is ATTACHMENT B SPENCER SIMULATION OUTPUT 1 1 I I r r ! r r • 1 , I L f - > b I 1 ,; : S I r F 1 i t t n • 1 g l e a - . • • r r 1 • : I 1 • ft • 1 • Ill 4 I 1 / 1 I ` 1 6 I e 1 I t 1 1 r I 1 III t 1 r C{.;7.-iJ ".5.. ▪f 1 .�r y y j/ l� .; K'v r .{ r r r I 1 .: a•-.:.. ,,. • • ,�^. �.- .. . 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Vi- V 4v go:- ti' ni' w!- d• gr ,r.. d V' 4 Al-- s!' ...t `d' 'ti' 4tr .�J' •a- ATTACHMENT C COLOR SIMULATION OUTPUTS I Hr _ _J__l.J C I d' 1 I I 1_ _ __ _ __ _..__ ____ __l_ __-_1____ I (a.• ra 1 I 1 1 I i 1 1 I I 1 I I t 1 I I I I I I IG I 1 y I 1 I 1 I 1 1 I I I 1 1 I 1 1 I":..n '_ 6 N y 1 I 1 I 1 1 � � 1� I / to > IyE N . ) z 1 {n , I I 1 I ,- I 4n,, b CO r I I I i o 1 I' 1 N I N 1 C 1 N q 1 1 4 I I 'E r. > YCS 111O41. 1 I I ..: . 1 I LI p 1 I E I I $ '^ O I ' v I _ _ ' 'o T Ve }e N �. >11 IN 0 ' �L: ' r C C4S a ax r O m A40 - C 1 RS ' - a • t cp ' a- 1 I U1 r I I I 0 o-. I __ ' 1 II - -' Cr ' ro . o- I H y y-. fj C• O i U .G C d • •6 ,, - ' _ Y _ _ .: a. P4 I .Q - O b� at; U O - N n G 45 I uJ m al , ,_ I .,—I di ID I I I N ,u V Y I 1 L i e Y? 6 5 r a- G N CJ I I 1 1 1 1 I I I I C I 1 1 1 1 1 1 1 1 1 I I Y I I 1 O I 1 I 1 I 1 I , 'ro 1. _. __r___ r i..2 �__r_ r____i r �_ r_ r__ _r i__r_i 'f 1 I 1 I 1 1 I I 1 I 5 I 1 ! f1 I I I (� .C011 1 {� !fi 1 (I� i.. 45 CD;. CO I i yl . II rte`- W 41 w.40 ma G45 0 CI 03 45 0 45 45 t5 0 SO PI UP 0 U7 Ul U7 Ul LI_ in 05 LP 0 U5 O1 V_ a UO a1' d' d1. d, v. .r' .v.yo. d' .O d' .4, Nit .,. d, d' w .r d' d• a1 v' .r .r d' a1 d• V v V iit lr • o .4 i i I • I I 1 /k4 i , . ."15 tt - 0 I M 4- iI ,y 8 b x N 1 . a CII o 4 ¢ !- 11 LL l AOLL Co a vrA o � F I CO '0•-• a f r -- - %t 4 of ,- - .--%f •• N _ U . r C CO �p in C7 u`. 4 R. N co N N to a ` I m E - g o0 a - � .O 0 C3 c3 0- . I 0 L c c p L- V c N n . N a o ` m = N M d u5 QS I.- t4 t71 0 --4 , O .! in j�CC J . U it) U U U 0 U U U I G cl n o > > > > O O o e i to c0 .- .- a toU U1U W N UJU) I try 7 U7 III_ ' HI - � p — _- pp tp N- NN- N N- v- pNp '0 co f .R M1 co w c n, in in t7 WI It u in YJ I in N q UPS b;:v '7 .CO uYn'_.' a j N 1d' c t-_ r tin_ - COt0 co„RO COtp cp. ca NI. •m a d" .r .r e v � v. v v v a .r .47 •1 c v' •c •m d v w a ; +f +r sr .r ^a i . 1 0 a 1 1__1__ __r_-r_ 0... 1 -7-i-vJ -.::s fir, +d ea,_ q i 2 II t, ' ro con V�: , u - 2 OD lb ;_ N i m, -i4,,- N 0 N `>i F' ''.„ C ti t CC � y .. V yr ' v G : ____ __ __ _ ____" _. ._._. 3..- ' oo N I ew N i Cl) - 8i N a -2 CO g u 4 ), "i CD t 1... _ t rn t 0 c L.i.� o f E - cy fV --, , - 2 ;. C G okfx �' 4, i 6 x,t jF e .L� U o o f H . i P I... O. r., - N `I C1•• V N" ! s � 3. j '-' � �w ,i' ' ` p.. l Cu) L w i- t� ,, _ .. , .1 s�,z.0 G' i I C) 0 C. C) a 0 0 N- W ii)ro. Ie_ COn co — a 0) N,I{-- Coi 'C vs a a � r N .O Ir1 la 4' O'- N r<oN C Ln laU) ppp (pp vd I ATTACHMENT D COLOR SOIL PROFILE • , . . -- : g i - - -- ,_ Icicicil./yi 3 / / gi/ ' />r ! tW i y S —a'J /'' //' i / d _ - : /q - // C5 o / M 1 • N i r- _-_.. _Y . -.. _ % t6 . 4 N r" / �/ 0 x f 0 co f :J y u_ • ? toyL - . - //i / .r t a` .. _ a. 1 x e: E a U al re) - f - • \ l 'it C -- _' of, // /' u. < • / / / 6 O - C 6 '" 66 Q'- _'• - - - -_s 6Y 2 r. o N- 4) -c.ccenc,caCIIICii "ccccicIccicc-c4c.Cc-cC:IiIIci-c:cccci ,--c:ctccc:<:$1,;:cc,cceicci,cc..4 (...4 V { . s W q 2,....f_ . i_...__e - x __ :✓✓...:: •`er '„*F44 � rei g,., ... 4-_-,.. N a bC? U' to N- - - i - ._ ____ __ __ _ _ y6• • 0 0 • • ' - - ' 1 i O 0 0 04^06 cif 0 0 0 0 0 O O b O O b b al pH" O b b O O b d O d d• 8 N d ch t0 t— cg: u7 ca,, - o u, u) u d +T n [+f f- t` w N N ' tttOGtl ' �D KS Fins �A �D W W N u'i u1 ui u) tf� u, u7 u3 V_ tic f `t •f_ 0 0 a u a 0, a v .r ,r v v a a q' y r .r a a v v V' a a v a v .r a er a Varra Companies, Inc. Office of Special Projects 1431 East 161h Street Greeley,Colorado 80631 Telephone(970)353-8310 Fax(970) 353-4047 Monday 13 June 2011 Weld County Clerk to the Board 915 10th Street, 3'd Floor Greeley, Colorado 80632 Subject: Varra Companies, Inc. — Western Sugar Reclamation Land Development Permit - Regular Impact (112) Technical Revision Application - Permit M-2010-049 Materials submitted to the Colorado Division of Reclamation Mining and Safety (CRMS) — Office of Mined Land Reclamation (OMLR): • Correspondence of 11 June 2011 from C.G.R.S. to the Colorado Office of Mined Land Reclamation, with attending attachments. Other Attachments: 1 Proof of Placement of this material with the Weld County Clerk to the Board. Your signature below acknowledges receipt of the above referenced material, as attached. The material should be added to the above referenced Application, as originally submitted to the Weld County Clerk to the Board, and made accessible for public review. Received On43.)A fl 1 3 , 2011 By: Office of the Weld County Clerk to the Board of ounty Commissioners Varra Companies, Inc. WESTERN SUGAR RECLAMATION LAND DEVELOPMENT PROJECT I OMLR Permit— M-2010-049 Hello