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iii iiiiiiiuiiu iii <br />/~~~ ACZ Inc. 999 <br />!/l~l'JI Engineering and Environmental Services <br />1475 Pine Grove Road, Suite 109 <br />P.C. Box 774016 <br />Steamboat Springs, Colorado 60477 <br />303-679-6260 <br />January 7, 1991 <br />~~~~ <br /> <br />Ms. Cathy Begej '~ <br />~ • G <br />Colorado Mined Land Reclamation Division ~qN 1 ~ 19g7 <br />423 Centennial Bldg. <br />1313 Sherman Street, Room 215 fitted Land <br />R <br />l <br />Denver, CO 80203 P" <br />a"'ation n~•.~-• <br />Re: The Rockcastle Company -Grassy Gap Mine (C-81-039) Annual Hydrology <br />Report <br />Dear Cathy: <br />On behalf of The Rockcastle Company, ACZ Inc. (ACZ) has performed monthly <br />and quarterly surface and groundwater monitoring, semi-annual sediment pond <br />inspections, and the annual seep and spring survey during 1991 at the Grassy <br />Gap Mine in Routt County, Colorado, Please find the Annual Hydrology Report <br />for 1991 included with this letter. <br />ACZ initiated monitoring in May 1991 consistent with the agreement for abatement <br />of the related Notice of Violation (NOV), therefore the enclosed report does not <br />represent a full year of monitoring data. ACZ will continue monitoring in 1992 and <br />anticipates collection of all data necessary to satisfy requirements stipulated in the <br />Mining and Reclamation, and Colorado Wastewater Discharge Permits currently <br />in place. <br />If you have questions concerning this Annual Hydrology Report or the previous <br />reports or results, please contact either myself or Jerry Nettleton at (303) 879- <br />6260. <br />Sincerely, <br />ACZ Inc. <br />Robert J. Peterson <br />Engineer <br />RJP:cmc <br />enclosures <br />cc: Robert Sherman/Ryan Inc. <br />Dean Massey/PMH&S <br />Jerry Nettleton/ACZ <br />c: \aorx\ pq\rkcasiie\enmm~ya.rpi <br />01/09/82 eem <br />