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RECEIVED <br />ppR 3 fl 2001 <br />Dip m1n9 a d Sa ery ' <br />Apri126, 2007 <br />Ms. Kelly Morgan <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division <br />4300 Cherry Creek Drive South <br />Denver, CO. 80246-1530 <br />RE: COLOWYO COAL COMPANY L.P. (COLOWYO); CDP$ NO. CO-00045161 <br />SETTLEABLE SOLIDS REPORTED DATA MODIFICATION REQUEST. <br />Deaz Ms. Morgan, <br />During the course of District Engineer Andrew Poirot's inspection recently, he noticed that Colowyo was <br />appeazing to report settleable solids (SS) concentrations which were above the permitted limit. Colowyo <br />investigated the matter and determined that when IML took over sample analyses duties from ACZ <br />Laboratories between Mazch and April, 2005 they failed to enter the correct method minimum detection <br />limit on Colowyo's analysis reports. The method used in this case measured SS concentration down to the <br />0.2 ml/L level and made it's determination ofnon-detection at that concentration, not at the 1.0 ml/L level <br />that is implied by their laboratory reports. As a result of Colowyo's policy of reporting the minimum <br />detection limit in instances of ND (non-detectable) results from laboratory analyses, values of "<L0" were <br />entered on all subsequent reporting forms begi aning with the second quarter 2005 through the fourth quarter <br />2006., As a result of this investigation, the con•ect method minimum detection limit of "0.2" will be added <br />to future laboratory analysis reports and IIvff, reprinted and sent to Colowyo connected laboratory reports <br />from April, 2005 through Mazch, 2007. <br />Colowyo has attached corrected copies of the DMR reports from the time period in question and requests <br />that the corrected values of "<0.2" be entered into the system to replace the "<].0" values reported in error. <br />It should be noted that SS concentrations during that time period were never detected above the 0.2 ml/L <br />concentration level, suggesting that the outfalls aze functioning well, especially during instances when <br />Colowyo is allowed to use alternative criteria during and within 48 hours of detectable precipitation and <br />stormwater inflow into the outfall structures. Also important to know is the fact that no current outfall <br />locations at Colowyo involved in waiver requests during April, 2005 through December, 2006 received any <br />process water from the operation, and all loading resulted from stormwater/meltwater activity. <br />Thank you for your consideration. Please feel free to contact me if you have any questions or concerns. I <br />can be reached at (970) 824-1531. <br />Sincerely, <br />Kurt~Blunt <br />Environmental Engineer <br />Encls. <br />C: CDMG/James S. w/encl <br />WQCD/Mdrew P. w/encl <br />IdPDES Reports Binder w/encl C.F. 21.1.2 w/encl <br />Colowyo Mine • 5731 State Highway 13 • Meeker, Colorado 81641 <br />T +1 970 824 1500 • P +1 970 824 1504 ~ www.rtea.com <br />Kurfis R Blunt <br />Environmental Engineer <br />