2014-04-21_HYDROLOGY - M1977348 (2)

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Manufacturing Performance Center April 21, 2014 Office of the State Engineer Colorado Division of Water Resources 1313 Sherman Street, Suite 818 Denver, CO 80203 Attn: Ms. Joanna Williams Holcim (US) Inc. Phone 719 - 784 -6325 Holcim 3500 State Hwy 120 Fax: 719 -784 -3470 Florence, CO 81226 www.holcim.com /us Reference: Holcim (US) Inc. - Boettcher Limestone Quarry — DRMS Permit No. 1977 -348 Dear Ms. Williams, Pursuant to my letter to Nathan Hernandez on November 14, 2012 wherein Holcim indicated that it would pursue the Liner Test on the water ponds within the Boettcher Limestone Quarry. The objective in pursuing the Liner Test was (i) to determine whether there is any groundwater seeping into the ponds which would, in turn would eliminate the necessity of Holcim having to provide an Augmentation Plan and apply for water well permits and (ii) to expedite the approval for the release of reclamation as requested in 2012. 1 am writing to let you know that Holcim has completed the pumping of three ponds and the monitoring of the water levels for 90 days as per the "liner test" requirements. The following is a description of the actions taken during the period for pumping and the 90 day monitoring: The project was delayed early in 2013 due to freezing weather and the fact that the ponds were covered with ice. Once the ponds thawed and Holcim was able to obtain pumps of sufficient rating to dewater the ponds, pumping was initiated. Pumping was initiated in Pond B on August 8, 2013. After Pond B was pumped out to a minimal level, we moved to Pond C and then Pond 2 (as shown on the map) and finished pumping in Pond 2 on November 30,, 2013. The `liner test' — 90 day monitoring was initiated in each pond after we pulled the pump at that pond.