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S__, <br /> <br />blue <br />cb~bon <br />company <br />October 22, 1986 <br />Thomas A. Schreiner <br />Reclamation Specialist <br />Colorado Mined Land Reclamation <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203-2273 <br />Re: Semi-annual Bench Hydrologic Monitoring <br />Report - File #C-047-81 <br />Dear Tom: <br />III IIIIIIIIIIII I III' <br />999 <br />blue ribbon coal company <br />p.o. box 1352 <br />palisade, Colorado 81526 <br />(303) 464-7951 <br />-., •) <br />OCT 27 1986 <br />IVII I~I~~i I_~•,+~J <br />FtECLASv4 . `lCl~ DIVIS!G^' <br />The following is the results of hydrologic monitoring on the restabilized <br />mine bench for the second and third quarters of 1986. <br />North Subdrain <br />Date 4/29 6/04 7/02 <br />Flow (gpm) 0.5 0.4 trickle <br />pH 7.2 ---- 7.9 <br />Conductivity 1490 @ 18°C 1290 @ 21°C 1120 @ 9°C <br />Date 7/31 9/04 10/3 <br />Flow (gpm) none none 0.1 <br />pH ---- ---- 8.3 <br />Conductivity ---- ---- 1310 @ 11°C <br />Middle Subdrain <br />Date 4/29 6/04 7/02 <br />Flow (gpm) none none none <br />pH <br />Conductivity <br />Date 7/31 9/04 10/3 <br />Flow (gpm) none none none <br />pH <br />Conductivity <br />