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1//Y <br />• <br />~~ 6~~~ ~ c <br />AMERICAN 1 <br />SODA, L.L.P. 1 <br />~ -III IIIIIIIIIIIIIIII <br />999 <br />710 Casper Ave. P0. Box 2070 <br />Glenwood Springs, CO 81602 <br />RECEIVED <br />SEP 1 ~r 1SS9 <br />Division of Minerals & Geology <br />Mr. Carl Mount <br />Senior Environmental Protection Specialist <br />Colorado Department of Natural Resources <br />I ~~ Division of Minerals and Geology <br />215 Centennial Building <br />1313 Sherman Street <br />Denver, CO 80203 <br />Telephone (970] 92B-9B6fi <br />Facsimile [970] 929-9863 <br />September 16,1999 <br />J.O.N. 124 WP 6, lb, l <br />Letter No. 124-736 <br />Subject: Technical Revision -Mining and Reclamation Permit No. M-99-002 <br />~k~Sto_rmwater Pond Spillway Calculation and Diversion Ditch Calculations <br />DDC~~ -/ Yankee Gulch Sodium Minerals Project <br />Dear Carl, <br />American Soda, L.L.P. (American Soda) filed an application for a Regular Operation <br />(112) Reclamation Permit (112 Permit Application) for the Yankee Gulch Sodium <br />Minerals Project (Yankee Gulch Project) with the Colorado Division of Minerals and <br />Geology (CDMG) on January 20, 1999. Prior to CDMG's issuance of Mining and <br />Reclamation Permit (112 Permit) No. M-99-002 by letter dated July 16, 1999, CDMG <br />requested and American Soda provided certain additional information relevant to the <br />112 Permit Application. In response to questions and comments from the CDMG's <br />Second Adequacy Letter, dated May 23, 1999, we provided a Second Additional <br />Information Response for the 112 Permit Application (American Soda's Second <br />Response), dated June 1, 1999. In that response, we explained that certain design details <br />related to site drainage were not yet available, but that they would be submitted to the <br />CDMG as a Technical Revision to the 112 Permit prior to construction. The information <br />described in Items 6 and 7 of American Soda's Second Response is hereby provided. <br />Item 6 of American Soda's Second Response provided a brief description of the <br />stormwater retention pond, which contains a discharge spillway system. The pond is <br />sized to contain the runoff from the initial processing facility area resulting from the <br />100-year, 24-hour storm event plus direct precipitation to the pond itself from the same <br />storm event plus the volume of the largest on-site storage tank. The pond spillway is <br />sized to accommodate the 50-year, 24-hour storm event, assuming a full pond. Design <br />Natura/ Sodium Products For a C/eaner Environment <br />