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Home My WebLink About20013509.tiff • • P E PICKETT ENGINEERING, INC. April 23, 2001 Clerk to the Board Weld County Commissioner's Office 915 10th Street, 3'1 Floor Greeley, Colorado 80631 RE: Application for a Mined Land Reclamation Permit PEI No. 01-006 Dear Sir/Madam: Enclosed herewith is a Technical Revision of the application for the S&H Mine to be operated by Platte Sand& Gravel, LLC. This copy of the Technical Revision packet is being delivered to you pursuant to Colorado Revised Statutes §34-32.5-112(9)(a), 1995 as amended. This packet must be kept with the original book for public review until the permit has been approved by the Division of Minerals and Geology, Department of Natural Resources. We will contact you once it has been approved and make arrangements to pick up this copy. If you have any questions, please contact me. Sincerely, PICKETr ENGINEERING, INC. / . (/1 / H k rt Kris A. Pickett, P.E. President KAP/jz cc: Sharyn Frazer, AgPro Environmental Services, Inc. Fred Ginsburg, Attorney for Platte Sand & Gravel, LLC Rocky Hoffschneider, Platte Sand & Gravel, LLC Steve O'Brian, Environment, Inc. Kim Ogle, Weld County Planning Tom Sharkey, Platte Sand & Gravel, LLC Weld County Attorney (/ 808 8th Street -- Greeley, CO 80631 Phone (970) 356-6362 — Fax (970) 356-6486 aOO1- 3569 pt_159,5 • • PE PICKETT ENGINEERING, INC. April 20, 2001 Erica Crosby Division of Minerals and Geology Department of Natural Resources 1313 Sherman Street, Room 215 Denver, Colorado 80203 RE: Technical Revision to S&H Mine 112 Application Platte Sand and Gravel,LLC File No. M-2000-158 Response to Hydrologic Adequacy Review PEI No. 01-006 Dear Ms. Crosby: Enclosed is a response to the aforementioned adequacy review. The contents include a flood mitigation plan. The map is color coded on an 11" x 17" size sheet and addresses the location of sensitive areas with potential for excessive erosion during flooding events. Cross-sectional views of the design of the protection of the mitigation measures, as well as an itemized cost for installation are included. As well, a discussion of the schedule of when these improvements would be installed is provided. This information has been forwarded to the Clerk to the Board of Weld County Board of County Commissioners. We will forward to you proof of submittal within the next three days. If you have any questions,please do not hesitate to call me. ' Sincerely, - PICKETT ENGINEERING, INC. 's A. ickett, P.E. Presi ent KAP/jz enclosures 808 8th Street — Greeley, CO 80631 Phone (970) 356-6362 — Fax (970) 356-6486 • • P E PICKETT ENGINEERING. INC. April 20, 2001 Erica Crosby Division of Minerals and Geology Department of Natural Resources 1313 Sherman Street, Room 215 Denver, Colorado 80203 RE: TECHNICAL REVISION TO S&H MINE 112 APPLICATION PLATTE SAND AND GRAVEL, LLC FILE NO. M-2000-158 RESPONSE TO HYDROLOGICAL ADEQUACY REVIEW DATED APRIL 18, 2001 FROM TOM SCBRELNER TO ERICA CROSBY PEI No. 01-006 Dear Ms. Crosby: Following the review of information provided by Pickett Engineering, Inc., relative to flood ' events and erosion potential for the proposed S&H mine, the Department of Minerals and Geology has requested additional information. The packet of information contained herein is intended to address the comments posed by the letter referred to above. 1. Enclosed is an 11" x 17"color coded map showing the locations of sensitive areas with " potential for excessive erosion during flooding events and these areas are associated with recommended mitigation measures,which are addressed within this packet. 2. We have provided cross-sectional designs for riprap protection, which will be the sole method of mitigation used for this project. Upon further consideration of the proposed mining activities and the mitigation procedures, it is my opinion that the use of equalization pipes and spillways would not be the most effective means of protecting or stabilizing the areas sensitive to excessive erosion during flooding events. Therefore, as the map indicates, there are two types of areas of mitigation. The blue line, which follows the length of the eastern bank of the South Platte River, is specified as "Riverbank Armor." The purpose of this blue line is to indicate the full extent of the potential areas that could be armored by the applicant. This armoring should only occur if the applicant is otherwise required to provide this armoring due to any permit requirements or due to the applicants desire to minimize the directional change of the river, which could possibly impact the applicant's ability to mine their property. Therefore, it should be made clear that this armoring is optional unless it is required by other agencies. The second type is indicated in green and for the most part is 808 8th Street — Greeley, CO 80631 • Phone (970) 356-6362 — Fax (970) 356-6486 • • located along the western and southern edge of the proposed lakes. This slope protection (riprap) is intended to be installed during mine operations only. The riprap protection would be installed during the mining operation and it is intended that no more than 500 feet of completed mined slope edge be allowed to remain unprotected at any one time. Once the mine operations are complete and mitigation procedures begin, it is intended for this riprap protection to remain in place as indicated on the enclosed cross-section titled"Lake Slope Protection." 3. The cost of this mitigation is estimated below. It is estimated that the riverbank armor will utilize approximately six tons of material per linear feet. We estimate the cost at S3 per ton or S18 per linear foot. Again,this armoring is optional but if the entire length were armored we estimated 20,000 linear feet or$360,000. Likewise the lake slope protection area is estimated to require about 41/4 tons of material per linear foot. At S3 per ton this would cost S13.50 per linear foot. We estimate currently that there is 22,000 linear feet of protection required for a cost of$297,000. Both of these are total maximum project costs. 4. Describe when during the mining and reclamation sequence that this specified mitigation procedures will be employed: As previously described, the riverbank armoring should be applied, if the applicant desires to maintain the current location of the river and/or when mining operations or other requirements of the applicant require that the applicant armor the river. The lake slope protection will occur during mining operations. Once the mining operations have reached the point of the extremity of the lake, in the area so highlighted on - the enclosed map, these areas will be armored at that time. No more than 500 linear feet of - bank will remain unprotected for a continuous operation. If mining operations cease along the bank edge this protection should be placed within ninety days of cessation of mining operations along the edge regardless of the length. Please do not hesitate to contact me if you need further information. Sincerely, PICKKEET�T ENGINEERING, INC. ickett, P.E. /Presi ent KAP/jz cc: Clerk to the Board, Board of County Commissioners Weld County Planning Platte Sand and Gravel, LLC Steve O'Brian, Environment, Inc. LAKE SLOPE PROTECTION NOT TO SCALE 41 MITIGATED SLOPE WATER SURFACE 5 ' RIPRAP 1 10 ' MINIMUM d50 = 24 " 3 D = 1 . 5 d50 MIN . D=3 ' MIN 1 1 2 • 1 RIVER BANK ARMOR SOUTH PLATTE RIVER NOT TO SCALE Z m LL 0 • a 0 I- I- CD w MAIN CHANNEL 10 ' MIN . D=3 MIN NORMAL WATER LEVEL �! 2 . 0 ' RIPRAP (OR BROKEN CONCRETE) MINIMUM d50 = 24 " D = 1 . 5 d50 MIN . I fr—_ ,c I / _ , 7 ;L. _ _ ' . /� �,� � KE /7w /✓ c•11,E 11]]{{R -- j ( jl 41 j 1 • • I j j' (t�. LGIG3KMN LAKE J, 20713 AC at > xl Rit ( fl I cH �" 1 :a it , �\1/4.:".......4.---", �b SY4RAEYS CAFE an is As A r is 1 - —�_ '',.) I 4 le 1 - ,__ 41,...c. b,i,.,k- I'-L rt t j - p• = L L G E N U '. k 4 i Afi[cIiu LA.Os— — •r 200 1001 LINE - • — AREA 50 NOAR ROADS • - • • - POH ER LOMmue.iCAi!ONS ONE `1 .. RAIL ROAD NACAa i 1 -- (WARNED GAsuNL \ T P . OIILII IiR,GAi ON ortkwn oTN 1I '- O 'R(E5 V 1 eft BRUSH ( I _ v 0 PONJ;.AN. 1_J I ,1 r BUILDINGS • OIL / GAS HEEL [�/yam • OIL FIELD IAI.AS & LAC.u0[5 /p/' r {— — d.. .. . I s [ACCPIIGN ARLAs d Ej • [ ....z_s n 1 r E{!'R'. MEADOW LAKE �E! IItN ea • NAP EXHIBIT F I I \ PLATTE SAND & GRAVEL, L.L.C. I \ S & H MINE Hello