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May 8, 2015 <br />Project No. LOVREA-2F6B-57-330 <br />Loveland Ready Mix Inc. <br />C/o Stephanie Fancher <br />P. O. Box 299 <br />Loveland, CO 80537 <br />RE: Proposed Future Pond Lining for the Loveland Ready Mix Pond #21 located in the <br />Northwest corner of Wilson Ave. and 1St Street, Loveland, Larimer, Colorado <br />Dear Stephanie, <br />As requested we have reviewed the data and soils for the proposed lining of the Loveland Ready <br />Mix Pond #21 in Loveland, Colorado located as indicated above. Pit 321 is located south of the <br />Big Thompson River and will encompass approximately 15 acres. The pit is proposed for a future <br />aggregate extraction site with the reclamation plan to be for an open meadow and not holding <br />augmentation water. <br />The mining operation is proposed to be approximately 28 feet from the existing site ground <br />surface. During the mining operation, the overburden is proposed to remain onsite around the <br />perimeter of the mined area to provide convenient close storage, minimize trucking, and provide <br />a sound attenuation feature. The base of the excavation will extend to the silty sandy claystone <br />bedrock. With the adjacent Big Thompson River, it is anticipated the ground water is relatively <br />shallow in the area. <br />A cross section diagram of the proposed lining is attached. The low permeability layer of the <br />lining should be constructed of the stockpiled overburden soils placed in a twelve foot (12`) wide <br />layer placed in staggered lifts. It is advised that the overburden soils be tested again prior to <br />placement to determine if the permeability factor is still valid and that the overburden has not <br />become contaminated. The interior facing of the dry pond meadow can also be the overburden <br />soils. However, if there is no overburden soils remaining, the interior face may be composed of <br />claystone bedrock material excavated from the bottom of the pit. We recommend the lining be <br />placed on the banks of the excavation after a minimum of upper twelve inches (12") has been <br />scarified, moisture treated, and compacted to a minimum of 95% Standard Proctor in accordance <br />with ASTM Specification D-698. The overburden lining should be placed in lifts of approximately <br />eight inches (8") and compacted to at least 98% of the materials maximum dry density using the