2010-03-17_REVISION - M2000156 (6)

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6.4.5 Exhibit E - Reclamation Plan This design and specification of this clay liner shall not be significantly modified without the Division of Mining Reclamation & Safety approval. Additionally, a final construction report and certification will be submitted to the Division of Mining Reclamation & Safety. Source Material Sampling/Laboratory Analysis A 5-gallon sample of weathered Pierre shale was collected from a gravel operation to the west. Collected from the upper 3 to 4 feet of the weathered horizon, the shale appeared very consistent with respect to color and texture with that of the weathered shale within the proposed excavation area. Moreover, personal communication with local excavators and drillers confirm the consistency of the Pierre shale throughout eastern Loveland. This consistency is most likely due to the flat lying nature of the shale in this region. If the source material shows any variability with respect to color, texture, or content from the sampled material, a full suite of geotechnical tests will be performed. Field data recorded during sample collection included: Color- dark gray Texture - Very fine-grained clay and silt with larger clumps that are friable with moderate pressure between fingertips Plasticity - Low Moisture - Moist The field sample was delivered to Aguirre Geotechnical Engineers of Englewood, Colorado, and the following tests were performed: Gradation Analysis - 1 %2" through No. 200 sieve Atterberg Limits - ASTM D-4318 Standard Proctor- ASTM D-698 Modified Proctor- ASTM D-1557 Data Analysis/Sample Material Suitability The results of the geotechnical tests are as follows: Gradation Analysis (Percent Fines) - 95.9% of material passed through a No. 200 sieve Atterberg Limits - Plastic Limit = 15 Plasticity Index = 24 Liquid Limit = 39 Standard Proctor- Optimum Moisture Content = 16.2%