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<'lrrre11ded Limited Impact 110 Operation Permit Application E llibits <br />Robins Rot -k Pit - Robins Constrnc•tion, LLLP <br />h) Water will be used for dust suppression and will come from Robins Construction nearby <br />yard in tank trucks. The Division of Water Resources has given Robins permission to use <br />up to 37 acre feet maximum in any one year, and an average of 9 acre feet per year in any <br />5 year period. After mining is completed, this water will be used for operation of the <br />concrete batch plant and asphalt hot plant. <br />i) Mining will immediately cease at any depth where ground water is encountered. It is <br />highly unlikely, based on our investigation, that groundwater will be encountered at any <br />time of the year. <br />j) We have, and will continue working closely with Division 3 of the Colorado Water <br />Resources to insure all applicable Colorado water laws and regulations are conformed to. <br />k) We do not anticipate exposing any refuse, acidic, or toxic materials during excavation, <br />but will dispose of them according to current federal, state, and county regulations, if <br />encountered. <br />1) The area of this pit is relatively small and we do not anticipate any overall disturbance to <br />the hydrologic balance, further any precipitation upon the reclaimed area will migrate to <br />groundwater level, at whatever depth encountered, without any additional resistance by <br />the reclaimed surface. Annual precipitation for the area is very low, and normally less <br />than 9 inches. Any runoff from the mining area will and the side of the mesa will be <br />detained at the bottom of the hill by a graded depression and ditch. Once detained, runoff <br />will infiltrate into the soil. The south end of the site adjacent to the field will also be <br />graded in such a manner as to be slightly below native grade, or have a berm protection <br />when necessary. <br />m) Deposit will be processed on -site. However, the gravel and sand mined at this location <br />will not be processed in any way other than normal crushing, screening, and stockpiling <br />operations. <br />n) The primary intended use for this material is for "J" hooks in an NRCS sponsored <br />reclamation project on the Conejos River and as ballast for the Cumbres & Toltec Scenic <br />Railroad. Secondary commodities will be sand and gravel for primarily roadway <br />construction projects. <br />o) No incidental products are anticipated. <br />p) Explosives have been, and will be used in conjunction with mining operations. Effects of <br />blasting are not expected to reach beyond the permit boundary. In 2007, Merritt LS, LLC <br />was hired to perform a study on the effects of blasting within the immediate area of the <br />Robins Rock Pit. This report can be found in the following pages within this exhibit. The <br />operator will comply with those recommendations included in the Merrit report, and with <br />the "Blasting Vibration Control Plan' outlined in the DRMS review by Allen Sorenson <br />dated December 19, 2007 (DRMS File No. M- 2007 -080). Furthermore, a pre -blast survey <br />of the area was conducted around the area of the Robins Rock Pit that showed there were <br />Prepared Bt: Sirrnmit Lnoinc•rrbig Co <br />Job Number: 4N61 Page 19 of 73 <br />