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Home My WebLink About20111596.tiff Varra Companies, Inc. Office of Special Projects 1431 East 161h Street Greeley,Colorado 80631 Telephone(970) 353-8310 Fax(970)353-4047 Wednesday 29 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 29 June 2011 from Varra Companies, Inc. to the Colorado Office of Mined Land Reclamation, with attending attachments. Attachments: 1 Proof of Placement of this material with the Weld County Clerk to the Board. 2 C.G.R.S. correspondence of 28 June 2011. 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 Ut.-c u 1 `y , 2011 By: �( ` � 2J-a � Office of the Weld County Clerk to the Board of County Commissioners R1/4)..\,-)1‘c, IQe a wA-) 1 It II 3c1 I 1 Varra Companies, Inc. WESTERN SUGAR RECLAMATION LAND DEVELOPMENT PROJECT I OMLR Permit—M-2010-049 2011-1596 Varra Companies, Inc. Office of Special Projects 8120 Gage Street Frederick,Colorado 80516 Telephone(970)353-8310 Fax(970)353-4047 Wednesday 29 June 2011 To: Michael Cunningham, E.P.S. Colorado Division of Reclamation Mining and Safety Office of Mined Land Reclamation 1313 Sherman St., #215 Denver, CO 80203 • From: Varra Companies, Inc. Bradford Janes, Forester Subject: M-2010-049 Western Sugar Reclamation Land Development Project - Reply to the Colorado Office of Mined Land Reclamation (OMLR) Preliminary Adequacy Review correspondence of 21 June 2011. Dear Michael: For greater continuity and ease of reference, we have iterated your comments necessitating a reply according to its respective item, iterated in a graphical box, with our comments in blue following: 6.3.4 Exhibit L - Reclamation Costs 1. The Applicant has proposed using the same unit rates that were used in the Kurtz Resource Recovery & Land Development Project (M-1999-006) to determine the cost to dewater the pits at the Western Sugar Reclamation Land Development Project. The pumping rates for the Kurtz site were approved because the Operator was able to demonstrate that a pump and associated infrastructure was in place at the site. In addition, the Operator supplied data demonstrating the cost to operate the pump. Please confirm the same pump and associated infrastructure will be installed at this site. Also, please confirm the cost to operate the pump will be the same as the cost at the Kurtz site. Pump design and infrastructure w ill be equal to or greater than that provided for the Kurtz operation. Pump manufacturer and completed facilities may be provided to the ()NIL': at the time of the first Annual Report to affirm this 1 statement as assurance regarding pump quality. consistency of discharge infrastructure and operating practices. and unit electric costs. Finally, your financial warranty determination of 21 June 2011 , sent 27 June 2011 , in the amount of $127,203.22. is agreed to. 6.5 Geotechnical Stability Exhibit 2. The Division has reviewed the Applicant's response to the Division's Slope Stability Analysis dated June 11, 2011. Please respond to the Division's comments in the attached document and make any necessary changes to the applicable exhibits. The Response continues as iterated below per the Memorandum of 17 .1une 201 1 from Tim Cazier, P.E. NOTE WELL ONLY those items needing a reply are iterated: Item 1 — Please provide further clarification as to whether any mining anywhere within the permit boundary is proposed below a depth of 45 feet. Your response should also consider the applicant's reclamation plan which proposes pushing up material from the bottom fo the pit to construct 3H:1V slopes. If the pit is mined to 45 feet, and no deeper, where is the material coming from to push up the slope for reclamation? Operations will be restrained from exceeding the 15 foot depth to. provide for adequate use of the bottom materials to establish finished slopes: in the absence of any data and subsequent depths supported by the data that would provide for deeper extraction depths beyond the 15 foot limit established respective of finished slopes and respective assurances of the supporting data by the OMLR via an approved Technical Revision. Item 2(b) — The response stated 'The values used were either reported by Terracon or in the absence of measured values we used table values provided by your agency.' There appear to be some discrepancies between this statement and what was used in the STABL for Windows model as shown in your `Soils Properties' screen capture in Attachment A of the response letter. The Varra Companies, Inc. correspondence of 29 June 2011 to the Colorado Office of Mined Land Reclamation 2 (OMLR) in reply to OMLR correspondence of 21 June 2011 —Western Sugar Reclamation Land Development Project—M-2010-049. attached Table 1 provides a summary of the various parameters used in the model; reported by Terracon; and those recommended by DRMS. Please update the analyses with unit weight, cohesion, and friction angle values for each of the five soil layers recommended by DRMS in the attached Table 1, or provide some rationale as to why other values should be used, specifically for the parameters for which Terracon provided measured values and values recommended by DRMS/DMG in the response reference.. Please refer to attached correspondence from C.G.R.S. of 28 June 2011. Additional Comments: Item 6 — The DRMS engineering staff uses the Galena Slope Stability Analysis software (Version 5.02) to analyze slope stability. The staff used the parameters recommended in the attached Table 1 and the Spencer-Wright method to analyze the two cases presented: 1) 'Pit Side Flood,' an d 2) the dewatered condition. The staff found all analyzed failure surfaces for the Pit Side Flood to have a Factor of Safety (FoS) very near or greater than 1.1. However, when the staff analyzed the dewatered condition, several failure surfaces were found to have a FoS below 1.0 and some surfaces originating as far as 26 feet from the slope crest with a FoS less than 1.1. Given the uncertainty in the soil properties and the water table, the proposed 25-foot setback must have a FoS of at least 1.1 in critical areas such as the gas wells. Please revise the mine plan and provide slope stability analyses to demonstrate the revised mine plan will result in a FoS of at least 1.1 in critical areas. Please refer to attached correspondence from C.G.R.S. of 28 June 2011. Attachments: 1 Proof of Placement of this material with the Weld County Clerk to the Board. 2 C.G.R.S. correspondence of 28 June 2011. Varra Companies, Inc. correspondence of 29 June 2011 to the Colorado Office of Mined Land Reclamation 3 (OMLR)in reply to OMLR correspondence of 21 June 2011 —Western Sugar Reclamation Land Development Project—M-2010-049. CGENVIRONMENTAL ©[ MICR? June 28,2011 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 CGRS No. 1-135-12539aa Dear Mr.Cunningham: The following provides responses to Mr.Cazier's comments of June 17,2011. Item 1—This issue is addressed by Varra Companies. Item 2(b)—This is a confusing response and appears that we are being asked to justify why we used field or laboratory measured values instead of table values. Varra performed direct shear testing on sand deposits at the Durham facility, which is adjacent to the proposed mine. The testing results are attached. A review of the data shows that the strength properties are much greater than those presented in the March 2003 table presented by the Division. Penetration resistance data also indicate strength values very close to those presented by Terracon for the Great Western Sugar site. We ran simulations using the table value data for the upper two soil profiles and strength properties for the lower three profiles as reported by Terracon. A safety factor of greater than 1.2 was calculated for this scenario. We also ran simulations using the table values for all soil profiles and obtained a safety factor of slightly greater than 1. Plates depicting the simulations are also presented as an attachment to this letter. Item 6—Our analysis using the table values presented by the Division indicates a safety factor of greater than one.The Divisions memo, relied upon by the Division, clearly states that the table values represent the worst case for critical structures and "any safety factor in excess of one should be protective of critical structures." We contend that additional studies are not warranted for the existing mine plan. Varra Companies conducted a geotechnical investigation, by a respected contractor, so that its slope failure analysis would reflect actual conditions. The Division's response appears to ignore field conditions and even contradicts its own recommendations. If the Division conducts its own analysis using the best available data and still concludes the FoS values are insufficient we agree to further analysis. 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 28,2011 Page 2 of 2 If you have any questions regarding this letter, please contact me at 970-493-7780. Sincerely, CGRS,Inc. Job L. .ams, P.G. cipal/Hydrogeologist rogeologist ATTACHMENT A STABL MODEL RUNS, GEOTECHNICAL DATA L i 6.0 — --_----- -- �d Moisture Dry ta 4.0 _ ,.� Sample Boring Depth Content (%) Density • . No. No. (FT) Before After (PCF) 1 B-4 14' 11 . 1 15.7 119 �.. , ---<Y 2 C' B-4 14 11 . 1 15.5 119 Y20 - - 3 B-4 14 11 . 1 14.5 119 # � � w w II d W (no.o 0 0.1 0.2 0.3 0.4 LL, %: NL PI, %: NP -200: NM HORIZONTAL DEFORMATION (IN.) Thickness (in): 1 .0 Diameter (in): 1 .935 Strain Rate (in/min): 0.0063 Peak Residual 50 - Normal Shear Shear Sample Stress Stress Stress O 0 No. (KSF) (KSF) © (KSF) O 4. O O 1 1 .5 2. 11 '1 .22 2 2.5 3.48 2.4 3.0 3 3.5 4.41 3.48 O 0 cn Peak (1) (DEG): 49 c Residual (I) (DEG): 44 alto N Peak C (PSF): 450 Residual C (PSF): 0 N0.0 -- 0.0 1 .0 2.0 3.0 4.0 5.0 NORMAL STRESS (KSF) Sample Description: SAND, SL.SILTY, MOIST, BROWN Sample Type: BULK Remarks: Dfrect Shear Test ResuOts CTL1T PROJECT NO. FC03746-125 FIGURE 4 Relationship between 4, and standard penetration number for sands, (from Meyerhof 1956,Foundation Engineering Handbook). 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