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Mr. David Bieber <br />July 1, 2015 <br />Page 2 <br />m:\min\tc1\_fremont\m-97-54 parkdale\tr06 reclslopechng\par2015-07-01.docx <br />above to 10 feet below the expected water line where slopes shall be not steeper than 3:1.” <br />Please provide the following: <br />a. The expected operating level of the water storage facility, <br />b. Engineering drawings, sections, and/or details showing the expected water <br />line/operating level and the 3H:1V side slopes where required by Rule 3.1.5(7). <br />2) Applegate Group Memorandum – The opening paragraph mentions: a) the “proposed <br />groundwater drain”. The Division could not find any information on the groundwater <br />drain; b) “Soil Strength parameters were determined from tests performed by North <br />American Testing, Inc.”, yet the attached lab report is from Geo-Logic Associates, and <br />assumption No. 3 states “Soil Parameters for the undisturbed alluvium and bedrock were <br />based on our previous analysis”; and c) “The section geometry was based off a figure <br />provided by you (David Bieber)”. Please provide the following: <br />a. Drawings and analyses related to the groundwater drain in order for the Division <br />to understand the intent and evaluate its effectiveness, <br />b. Clarification on the source(s) for each soil parameter (“Slope Fill”, “Native <br />Alluvium”, and “Native Shale Bedrock”) used in the stability analyses, and <br />c. The section geometry based off a figure provided by David Bieber. This should <br />include the final mined slope of the alluvium and the proposed liner for <br />comparison to the slope stability analyses. (Note: based on Comment No. 1 <br />above, this section geometry should be revised.) <br />3) Slope Stability Analyses: Based on the aforementioned Rule 3.1.5(7), the stability <br />analyses should be re-run with the appropriate slope geometry. Please provide the <br />updated analyses. <br />If you have any questions or need further information, please contact me at (303)866-3567 x8169. <br /> <br />Sincerely, <br /> <br /> <br />Timothy A. Cazier, P.E. <br />Environmental Protection Specialist <br /> <br />ec: Wally Erickson, DRMS <br /> DRMS file