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STATE OF COLORADO <br />Roy Romer, Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAViD C. SHELTON, Director <br />DATE: June 8, 1987 <br />T0: Dan Mathews <br />FROM: Cathy Begej ~~~ <br />RE: LITTLE MIDDLE CREEK PERMIT REVIEW (N0. 1), ECKMAN PARK C-81-071, <br />SUPPLEMENTAL OVERSlJRDEN ANALYSES <br />Summary: Selected parameters (Ca, Mg Na, SAR, NHq, N03, Cd, Pb, <br />Ni, Acid-Base Potential, Sulfur Forms, Neutralization <br />Potential, pH & EC) were analyzed in two new holes in zones <br />15' above and 10' below the overburden. Sulfur forms from <br />the coal were submitted for six holes drilled in 1984. <br /> <br />Observations: These samples seemed less toxic than those examined <br />previously. No problems were noted with Cd, pH and NH4, <br />acid-base potential maximum values looked better, and pH was <br />a half unit (0: 5) more alkaline. - <br />There still exists a problem w/acid base potential and <br />nickel, with statistics lining up well with previous analyses \w '~~ <br />n~'~""w. -~ (over 40% of samples show acid-base potential exceeding ,~,\~`~~` <br />~ ~ ~ 0~~- recommended overburden limitations and over 75% show nickel <br />SJ~Sr~~"_`~ y_-.. exceeding recommended overburden limitations). ~f <br />Recommendation: Since the top of the spoils will probably contain a large <br />portion of the roof material, I would note the possibility <br />for acidity problems and nickel toxicity in the Findings, but <br />ignore the problem unless revegetation becomes an issue. I <br />would concurrently recommend that no decrease in topsoil <br />depth requirements be approved. <br />Additional Quality Control Comments: <br />°I wonder if the location of two holes is reversed on Map 83, as the log <br />for 026-87-2 had a 2' parting and I thought the parting showed up in the <br />eastern part of the tract. <br />°I wonder if sulfate sulfur tests were run on coal samples. All analyses <br />equal zero, and I suspect no analysis was run. As sulfate sulfur is a <br />minor constituent, I will ask them about it, but won't press it. <br />/vj r <br />0261E <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />