2012-11-19_HYDROLOGY - M1977348 - Laserfiche WebLink

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Manufacturing Performance Center November 16, 2012 Jonathan Hernandez P.E. Division of Water Resources 810 9 St., Suite 200 Greeley, CO 80631 Dear Jonathan: E G5 Holcim (US) Inc. 3500 State Hwy 120 Florence, CO 81226 RECEIVED NOV 19 2012 Division of Reclamation, Wing & Safety Phone 719 - 784 -6325 Fax: 719- 784 -3470 www.holcim.com /us Reference: Holcim (US) Inc. — Boettcher Limestone Quarry — DRMS Permit No. M- 1977 -348, WDID 0303043 Pursuant to your letter of October 31, 2012, regarding the Boettcher Limestone Quarry, I am responding on behalf of Holcim as to the option that Holcim will follow regarding the water issues at the Boettcher Limestone Quarry site. Reviewing the options, Holcim confirms that it will not pursue Options A or C. With respect to Option A, Holcim does not believe that it can clearly demonstrate at this time that the water present is only from precipitation and not groundwater and, with respect to Option C; backfilling the pit(s) is not economically feasible at this time. With respect to Option B, Holcim is researching the area at Pond B which we believe to be pre - 1981. This may also hold true for Pond A although Pond A is intermittent as it was dry a few months ago. Holcim will provide such documentation by December 31, 2012 as you requested in your letter. With respect to Pond 2 and Pond C, Holcim will pursue Option D -- the Liner Test. Holcim believes that the surrounding rock provides a natural liner and that any natural seepage is below the State Engineer's allowable leakage standards given that the hydraulic conductivity is estimated to be approximately 4x10 centimeters /second (1x10 -4 feet/day). It is Holcim's intent to pump out the water then monitor for influx of water and precipitation events as per the Section 3.0 Performance Standards of the State Engineer Guidelines for Lining Criteria for Gravel Pits — Issued August 1999.