2009-08-13_REVISION - C1991078 - Laserfiche WebLink

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C- 1991 -078 TR -09 Adequacy Review 13 August 2009 Page 3 of 3 For the evaluation of water quality in the pond, the CDPHE, Water Quality Control Commission — Agricultural Standards for Surface Water should be used as the testing parameters. These are deemed to be the most appropriate and applicable standards for a permanent stock pond that is intended to be primarily used for livestock watering. Agriculture (state use classified) surface waters are defined as suitable or intended to become suitable waters for irrigation of crops usually grown in Colorado and which are not hazardous as drinking water for livestock. To show compliance with 4.059(13) (a), the operator should demonstrate that the impounded water is of suitable quality for livestock watering. Please provide a laboratory analysis (if this has not already been previously provided) and a comparison of the pond water quality with the Agricultural Standards for Surface Water. Please incorporate the requested information into the revision application materials. 6. Since Pond B is now being requested as a permanent postmine feature, the operator should aggressively implement the approved weed control plan and control the growth of Tamarisk and other weeds that have been recently reported in DRMS inspections of the area in and around Pond B. 7. The last sentence of the first paragraph on revised page 2.05 - includes an extraneous "be'; which should he deleted. The second sentence of the fourth paragraph on revised page 2.05 -8 of the application is at odds with the changes proposed with TR -09. Please revise this sentence to refer to "temporary" impoundments only. This concludes the Division's Preliminary Adequacy Review for TR -09 for the Hamilton Mine. Please contact me with any questions you may have. Sincerely, j aat4 a� � Marcia L. Talvitie, P.E. Environmental Protection Specialist Enclosure — (1) Cc: J.E. Stover & Associates DRMS Files