2013-02-08_HYDROLOGY - M1977348 (3)

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Manufacturing Performance Center January 30, 2013 Jonathan Hernandez P.E. Division of Water Resources 810 9th St., Suite 200 Greeley, CO 80631 Holcim (US) Inc. Phone 719 - 784 -6325 3500 State Hwy 120 Fax: 719 - 784 -3470 Florence, CO 81226 www.holcim.com /us RECEIVED FEB 0 8 2013 DIVISION OF RECLAMATION MINING AND SAFETY Reference: Boettcher Limestone Quarry — Exposed Groundwater DRMS Permit No. M- 1977 -348, WDID 0303043 Dear Jonathan: RECEIVED FEB 082013 Division of Reclamation, Mini; Safety Pursuant to your letter of October 31, 2012, regarding the Boettcher Limestone Quarry, I am responding on behalf of Holcim as to Holcim's request to exempt some ponds, specifically ponds on the West side of the property as they were exposed to mining activity prior to 1981. Colorado Revised Statute §37- 90- 137(11)(b) allows pre -81 exposed groundwater areas to be exempted from augmentation requirements for the evaporation of groundwater. Per you letter, in order to seek an exemption for pre -81 areas, Holcim is submitting the following documentation: • An aerial photo taken in 1974 that shows the location of the pre -81 area. (Figure 2) • A current aerial photo showing the claimed pre -81 area and mining permit boundary as it existed at the time the at the time the groundwater was exposed. (Figure 1) • A GIS compatible file that has a shape file for the pre -81 area and the permit boundary as it existed at the time the ground water was exposed. (Enclosed CD ROM) • A calculation of the area shown on the aerial photos. (Figure 1) Please note that the map coordinate system is based on NAD 1983 State Plane Colorado North FIPS 0501 Feet NAVD 88. Figure 1 shows the current photography and the outline of the Permit Boundary as permitted through the Department of Natural Resources, Division of Reclamation, Mining and Safety - Permit #M- 1977 -348. Ponds 2 and C are on the Eastern side and are post 1981. The Ponds being requested for exclusion per the Pre -81 statute are Ponds A, B, B2, and B3 which are identified by coordinate on the West side of the Permit Boundary. The calculation indicating approximate area is shown on the map. Figure 2 shows the permit boundary and the pre -law (pre 1977 Reclamation Act) areas as well as the ponds overlaid on the 1974 photo which shows the areas being mined prior to 1974.