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Jane 1996 H-G Coa! Company ' Facilities Area Phase !Bond Release Applicanon ~ d <br />to determine the bond release amount for this bond release application are included in Exhibit 1, <br />Facilities Area Phase I Bond Liability Release Calculations. <br />l) As-built Post-mining Topography Map Showing the Regraded Contours: <br />• Map I, Facilities Area Reclamation Map is acomputer-generated map developed <br />from the As-Built Post-Mining Contour Map generated from the aerial photography <br />datum photographed on December 3, 1987. The original map was submitted to the <br />Division as part of the Mine Site Phase [Bond Release Application. <br />2) Certified Cross-sections of the Backfilled and Graded Area: <br />• Map 2, Facilities Area Post-mining Cross-Sections Map, shows the certified cross- <br />sections for the facilities azea and topsoil pile post-mining topography delineated on <br />Map 1. HGCC previously submitted certified cross-sections of the post-mining <br />surface configuration for the shop/warehouse area in MR-03 (Facility Reclamation <br />Minor Revision) which was approved by the Division on August 4, 1987. <br />3) Drainage Documentation and Profile: <br />• No permanent drainages were constructed in association with the facilities area <br />reclamation. However, Pond 003 has been approved by the Division as a permanent <br />post-mining structure. <br />4) Drainage Control Documentation: <br />• HGCC has provided the Division with drainage control documentation in the HGCC, <br />1 Annual Reclamation Reports since 1988. All pond discharges have been in <br />compliance with the Colorado Wastewater Discharge Permit System (CDPS) permit <br />requirements. All monitoring results indicate that sedimentation ponds 001 <br />l (Explosive Storage Area pond) and 002 (Landfill Area pond) have never experienced <br />a discharge event. <br />Monitoring of pond 003 (Shop Warehouse Area pond) indicates that 003 has had <br />infrequent discharges to Upper Hayden Gulch, most recently in April 1996. All <br />ponds at the mine site are permitted under CDPS Permit No. CO-0036447. NPDES <br />discharge records indicate that the discharges from pond 003 meet post-mining <br />effluent limitations for pH, TDS, oil and grease. In addition to monitoring for the <br />CDPS effluent parameters, HGCC has periodically analyzed pond discharge for <br />TSS. TSS was analyzed to compare discharge suspended sediment against <br />background suspended sediment in Upper Hayden Gulch surface water. Table 1, <br />TSS Results from Pond 003 Discharge, summarizes the TSS values which have been <br />recorded. <br />The Hayden Gulch Mine Annual Reclamation Reports (HGCC, 1988; 1989; 1990; <br />1991; 1992; 1993; 1994; 1995; 1996) provide the results of water quality monitoring <br />for the Upper Hayden Gulch surface water site (UHG), located downstream of ponds <br />001 and 002. TSS concentrations range from 2 mg/L to 104 mg/L. Baseline <br />sampling conducted as part of the Mine Permit Application indicate that the <br />TerraMatrix /nc. • P.O. Bos 174018 • Steamboat Springs. Colorado 80477 • (910) 879-6160 <br />"`°""°"""""":E""°"'~"°°~ Revised 4/8/97 <br />°M] Cpl <br />