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WATER INFORMATION <br />1. Surface Water General Discussion <br />EXIIIBIT G <br />The site currently is used as irrigated fields. The fields are bordered on all sides by active <br />irrigation ditches. Presently the water from these ditches is being used to irrigate the field as <br />well as adjacent fields. These ditches act as return ditches for other farmers irrigation. Several <br />irrigation ditches run through the property which aze currently used for irrigation Irrigation of <br />neighboring fields is not expected to affect or be affected by this operation once mining has <br />commenced. Upon commencement of mining at the Anderson Pit, irrigation will cease onsite. <br />Increased water flow into the pit area may occur during irrigation periods due to adjacent fields, <br />but it is not expected to be change drastically. <br />The pit is within a mile of the Gunnison River. The pit's proximity to the river is not expected to <br />be an issue. The 100 year flood plain does not enter the permit boundary. See Map C-1. The <br />flood plain is bordered by 1675 Road. An open field acts as a buffer from the river to the <br />Anderson Pit. Quality and flow rates for the river at this location can be found in Appendix C. <br />The three principal ways that the gravel pit could affect the water quality of the azea downstream <br />aze a) through poor sediment control within the site causing increased sedimentation <br />downstream, b) by fuel leakage from a ruptured tank, and c) increased selenium in the discharge <br />by mining on the top of the Mancos Shale. As described in the mining plan, the sediment pond <br />and sump will be designed for optimal sediment control. Fuel leakage is also not a problem <br />since all fuel tanks on site will have secondary containment as well as strict SPCC Plan <br />procedures for spill prevention and control. As seen in the water data in Appendix B, selenium in <br />the North Fork of the Gunnison River runs at approximately 4.0 µg/liter. The CDPHE <br />determined that the level of selenium chronic to aquatic life is 4.6 µg/liter. The acute level is <br />18.4 µg/liter. <br />Anderson Pit February OS G-1 <br />