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i-. <br />Ms. Lori Potter ~nC <br />November 3, 1999 <br />Page S <br />'I <br />Iron has two standards, one for total recoverable and one for the dissolved form; and <br />The mercury standard is for the total recoverable form, not total. <br />Please provide the analytical methods that will be used to perform these analysis. Please provide <br />the detection limits for these methods; they must be at or below the water quality standards <br />applicable to Rio Grande Basin Segment No. 28. Many of the metals are hardness-be.sed; <br />conservative hardness values should be used to determine appropriate analytical met~ods. <br />Appendix A. Section 2.3. Page 6, Paragraph 3 <br />Currently, the DMG requires monthly monitoring at the downstream most surface water monitoring <br />station, RS-S. We recommend maintaining the monthly monitoring frequency at this particular <br />location. <br />Please call me at 303-665-6283 if you require additional information. <br />Yours truly, <br />ROCKY MOUNTAIN CONSULTANTS, INC. <br />~,~~ ~~~ <br />Bruce T. Marshall, P.G. <br />Associate, Senior Project Hydrogeochemist <br />BTM:bm <br />Attachment <br />cc Mike McGowan, CCCD <br />I.UISi 001\Response_I.wpd <br />