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Rule 4.05 <br />• Sediment Ponds <br />During operations, sediment ponds were utilized [o treat drainage from all affected azeas within <br />the mine permit boundary. Ponds and diversion structures were designed to control runoff <br />from a 10-year, 24-hour storm event. Water treatment consisted of simple settling and <br />controlled release of the water. Discharges from the ponds were subject to NPDES permi[ <br />limitations as set forth below. <br />Parameter Maximum Minimum <br />Iron, total (mg/1) 7.0 3.5 <br />Manganese, [o[al (mg/I) 4.0 2.0 <br />Total Suspended Solids (mg/1) 45.0 pH 30 <br />pH (s[d. uni[s) between 6.0 and 9.0 <br />Pond discharges during operations did no[ exceed [hese limits. Current monitoring requirements <br />for discharges from the permanent impoundments are: <br />Measurement <br />Parameter Frequencx <br />Settleable Solids (mg/1) Monthly <br />Total Dissolved Solids (mg/1) Quarterly <br />Oil and Grease (mg/1) Monthly <br />Flow (mgd) Monthly <br /> Monthly <br />• <br />Discharges from the sediment ponds are intermittent in nature and varying in magni[ude <br />according to snow melt storm events or subsurface inflows. <br />Monitoring of surface and ground water will continue as described above until such time as [he <br />MLRD approves a reduction or dele[ion in the monitoring program. All monitoring and <br />sampling da[a will be maintained at the TerraMatrix Office at 1475 Pine Grove Road in <br />S[eamboat Springs, CO as required by Rule 4.05.13(4). Results of the monitoring program will <br />continue to be reported [o DMG in [he Annual Reclamation Report for HG Coal Company. <br />• <br />H:~B7] V+EItMRUtULE~-0S.HC <br />11/39/95 B:SSun mrsv~,~ 4.05-3 Revised - 11/28/95 <br />