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Suite zao, 7"° so. t°bra°° a"°. Northern <br />P. O. Box 17583, Terminal Annex <br />Denver, Cobrado 80217 Coal <br />TekOnone 303-753-8800 ~ ~ Company <br />October 23, 1980 <br />Mr. Jim Herron <br />Reclamation Specialist <br />Colorado Division of Mined Land Reclamation <br />1313 Sherman Street <br />Denver, Colorado 80202 <br />Dear Mr. Herron: <br />Please find enclosed a copy of the 22 October 1980 Espey, Huston b <br />Associates, Inc. letter containing a copy of calculations demon- <br />strating the Phase I pond design to be conservative. Also find <br />enclosed a copy of the revised dewatering device for the pond <br />including specifications. The permanent location of the dewatering <br />device above the sediment storage level prevents any possibility of <br />decanting sediment out of the pond. - <br />Persuant to our conversation of 22 October 1980 Northern Coal Company <br />will delete turbidity, hydroxide, alkalinity, li[hium and dissolved <br />iron and will add arsenic, barium, cadmium, lead, selenium and silver <br />to the list of water quality parameters to be monitored for any pond <br />discharges. <br />I am having Espey, Huston 6 Associates look into the derivation of a <br />curve number and what size pond would be needed for the ultimate <br />project. Should actual waste production ever require construction <br />of the ultimate project, Northern Coal Company would supply C2II.RD <br />with the calculations and, if necessary, the pond(s) design for <br />approval. <br />If you have any questions, please call me (753-8622). <br />Sincerely, <br />NORTHERN'C/OAL COPi~P,AN~Yi <br />dG~ G(/ iG~C+`N~/ <br />Terry W. Schulz (~ <br />Environmental Specialist <br />TWS:rg <br />Enc. <br />