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~~~ ACZ Ine. <br />Englneering and Envlronmenlel Servlcea <br />1475 Pine Grove Road, Suite 109 <br />P.O. Box 77401 B <br />Steamboat Springs, Colorado 80477 <br />303-879-6260 <br /> <br />March lo, l~rz v1AR 12 1992 <br />Ms. Catherine W. Begej Mined Land <br />iiir~iirrriirriirii <br />s99 <br />Mined Land Reclamation Division '7e^'9"-^finr n'"~-` <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: EFCI Southfield Mine (Permit No. C-81-014), Design of Ponds 2 and 3 For the 100-Year, 24Hour Storm <br />Event <br />Dear Ms. Begej: <br />As a result of our recent conversation relative to rbanges in the regulations wilh respect to [he specified design <br />event for storm runoff retention capaa[y, I have enclosed three copies of revised desigrr calculations and related <br />text and map revisions for Ponds 2 and 3. <br />• The revised calculations reOeU runoff and deed preapita[ion to the two pond basins as a result of a 100-year, <br />24hour design storm event. Because the contnbuting drainage areas for these two ponds are so small, the <br />resulting inQemeatal storage volume required is minima] and the only effect is a minor reduction is design <br />freeboard. No adjustment in permanent pool levels or other goad design or operating modifications are <br />required. <br />Please review the accompanying permit materials, contact me with any questions or concerns, and replace the <br />revised information in the Division's copies of the EFCI Permit Application document as appropriate. <br />Sincerely, <br />ACZ Inc. <br />~~i~~!~ <br />Jerry M. N etoa <br />JMN:cm <br />enclosures <br />cc: Randy Aae/Sou[hfeld (w/o encl) <br />Al Weaver/ Southfield (w/eocl) <br />Philip Goldsmith/EFC (w/encl) <br /> <br />=\wrt\vn\era\~PIAr <br />ulna/9: l:pm <br />