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SQL T CRF'E'K rVII_tiI ~'~ G COrtiIP~N~" _ - { P.O. Box 70 Loma. Colorado 81=24-00'0 ~ (303) 8~8-3608 ~ I I July 20, 1992', CDCn - West°.^ v'+:a.i~? CUntr01 D17:s:on Pe.-mils and Enforcemen. Section ??10 East 11T3 avenue Den•:er, CO 8G_20-3710' Re: Perait CO C0333?? Dear Sis. Ihlenfeidt; Ca tae night of July 12, 199°. there was an intense storm at Salt Creek's McClane Canyon hiine. The storm s*.arted at about 9:00 FH, lasted about one half hour and deposited about 2.5 inches of rain. The 10 year 2=4 hour storm for this area is about 1.4 inches. This storm approximated the 100 year 2'{4 hour storm event, 2.4 'inches.. The sediment pgnd at the mine was; completely filled with sinter ~nti- _ -sediment. This goad is designed to-retain the volume of siz 10- pear ( - 24 hour bvents! Prior .to the storm there was approximately volume - _-- - of one 10_ year ;e vent stored is thx-pond. - do unkuoWn quantify of ,- . water and sedisent.rbypassed the pond-through-the emergency spillway-= and overflowed 'the embankment after the pond was filled. - On July 13, 1992, Mr. John Subic of your office was informed of the storm and the need for Salt Creek. to discharge the water in the pcnd to regain the capacity of the pond for the next stores. An exemption for the large storm was also requested. bir. Subic explained that the aormal~procedure was to discharge the water and sample the discharge.. fie e:plained tin= these resul~s should ba submitted with tea next D~fR for Point 001. It was ag.eed that normal samolina proced::res and reporting would Se followed. Salt Creek also committed to send you this latter new to es?lain the circumstances of the discharge. I will also resubmit this litter and the sampling res+alcs with the D~1R for this quarter. Please call! if there are questions or if I can be of assistance. Sincerei, r~ ~~-- i ' !/= -,. ~- _ John M. Walters Manager of Mine Services J ~y' _ it r~ -r