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INTEROFFICE MEMORANDUM <br />TO: ZACH TRUJILLO <br />CC: DAN HERNANDEZ <br />FROM: ROB ZUBER <br />SUBJECT: MUNGER TR -25 ADEQUACY REVIEW — WATER QUALITY REGULATIONS <br />DATE: 5/13/2014 <br />Zach — <br />I recommend that the following be included in your adequacy letter to C ," I. <br />Per Rule 4.05.2(2) sediment ponds shall me maintained until the disturbed area ceases to contribute a sediment load <br />above natural conditions and "the quality of untreated drainage from the disturbed area meets the [applicable] State and <br />Federal water quality standard requirements ... for receiving streams." Stover and Associates has provided the first part <br />of this (the sediment load portion), but has not addressed the portion of the rule regarding water quality requirements. <br />CA Al Mining (or consultant) needs to address this by comparing water quality requirements in receiving waters to <br />measured or predicted water quality in runoff from the areas in question (without treatment from the pond or other <br />sediment control practices). The water quality requirements that are relevant are those of the Water Quality Control <br />Commission (within the Colorado Department of Public Health and Environment), namely Regulation No. 37, <br />Classifications and Numeric Standards for Lower Colorado River Basin. <br />Thanks, <br />Rob <br />