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Manganese -dissolved <br />Molybdenum -dissolved <br />Sodium -dissolved <br />Selenium -dissolved <br />Lead -dissolved <br />Hardness (as CaC03) <br />Alkalinity, total (as CaC03 to pH 4.5) <br />Carbonate (as C03) <br />Bicarbonate (as HCO~) <br />pH (pH units) <br />Specific conductance (mmhos/cm) <br />Chloride <br />Hydroxide (as OH-) <br />Sulfate (S0,) <br />Totai dissolved solids (at 180 degrees C) <br />SAR (sodium absorption ratio) <br />2. There is no surface water monitoring described in the Application at the <br />Keenesburg Mine Site (Sec 2.04.7). On December 18, 1989 Technical Revision <br />N23 approved the deactivation of the NPDES permit with the Department of Health <br />concurring. Permit COG-850038 was later instated (re-instated), with an expiration <br />date of 6/30/97. CEC has again proposed, and CDPHE approved, the expiration of <br />the NPDES permit without renewal (see CDPHE letter, undated, Re: Request for <br />Inactivation, Coors Energy Company -Keenesburg Mine, CDPS No. COG-850038, <br />Weld County, CDMG files). <br />3. The Division will require the sealing of drilled holes. Each hole, well or other <br />underground opening is to be capped, sealed, backfilled, or otherwise properly <br />managed. (Rule 4.07.3){Application, page 114b) <br />4. The Division proposes to exempt certain small disturbed areas (topsand storage <br />and reference area sites) from the requirement for sediment ponds. This is because <br />of the limited size of the areas, and that ponds and treatment facilities are not <br />necessary for drainage to meet the effluent limitations of Rule 4.05.2 and applicable <br />State and Federal water quality standards for receiving streams. No mixing of the <br />surface drainage from these areas with a discharge from underground workings will <br />occur. The small areas to be exempted are described in the Index Maps and Legal <br />Description sections of the Permit and Application. [Rule 4.05.2(3)(b)(I)] <br />B. Diversions and Conveyance of Overland Flow <br />There are no, and there is no requirement for, permanent diversions on the site. [Rule <br />4.05.3(3)]. <br />26 18 February 1998 <br />