Laserfiche WebLink
i <br /> TETRATECH RMC <br /> MEMORANDUM <br /> TO: Mike Refer,Aggregate Industries-WCR,Inc. <br /> FROM: Christoph Goss, Tetra Tech RMC Cr(f <br /> RE: Material Quantities at Proposed Tucson South Resource; <br /> Tetra Tech RMC Job No. 19-3919.019.00 <br /> DATE: May 25, 2004 <br /> This technical memorandum is written in response to your request at the April 27,2004 status <br /> meeting to provide a material quantity estimate,refine the mud lens extents,and draw interpreted <br /> geologic cross-sections at the proposed Tucson South gravel resource site. The material quantities <br /> described herein supercede and replace the quantity estimates in the Tetra Tech RMC memos of <br /> March 17,2004 and April 13, 2004. <br /> Quantity estimates are based on 2004 Tetra Tech RMC drilling results (report pending)and summary <br /> drill logs provided by Aggregate Industries (Mike Refer,February 2004,on file at Tetra Tech RMC). <br /> Table 1 shows the estimated in-place material quantities within the mining limits shown on Figure 1 <br /> (current as of.Mar 19,200,4)_ All n•ear'tities ar4 in cud it ya—Is No t^=n`n <br /> determined. For finis project we define overburden as fine-grained soil above the main sand and <br /> gravel deposit and a mud lens as clay and silt zones within the sand and gravel.These raw quantities <br /> assume no bulking or compaction.The sand and gravel will contain additional fines(waste material) <br /> that would be removed by washing. All volumes in this memo are before washing. <br /> Table 1 breaks the quantities down by cell and high wall slopes. While vertical slopes will provide <br /> the most material, such slopes may be unstable;hence quantities are shown for a 1:1 (H:V) slope as <br /> well. <br /> Table 1: Estimate of Material Volumes At Tucson South Site <br /> Near Vertical High Walls High Walls at 1:1 Slope <br /> West Cell East Cell WWI Total Site West Cell East Cell SW Cell I Total Site <br /> Overburden 357,000 465,000 116,000 938,000 356,000 461,000 115,000 932,000 <br /> Mud Lens c 275,000 12,000 59,000 346,000 259,000 12,000 49,000 320,1000 <br /> Sand&Gravel 2,164,000 3,884,000 517,000 6,565,000 2,109,000 3,679,000 482,000 6,270,000 <br /> `In-place quantities before washing <br /> AU volumes in-situ:no shrinkage or swell assumed <br /> 1900 S.Sunset Street,Suite I-F.Longmont CO 80501 <br /> Tel 303-7723282 Fax 303.665.6959 <br /> www.ttrmc.com <br />