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PQabody <br />Twentymile Coal Company <br />Memo <br />To: Mike Berdine <br />From: Jerry Nettleton <br />Date: September 12, 2006 <br />Re: Sedimentation Pond Cael Firres Disdiarge <br />Mike- <br />At about 10:30 AM yesterday morning (09/11/06), Dave Wallace notified me of an <br />unanticipated disdrarge of coal fines 1b Sedimentation Pond E from a broken thickener <br />trrderFlow dedrarge line. The line apparently ruptured near the inlet 1p Pond E, <br />discharging slurried coal fines into the Pond. The disdrarge went urrdetec83d for some <br />time, and ~ a result, the slurried coal fines built-up in the Pand and disdrarged thrax,~r <br />the principal spillway riser to Foidel Creek. <br />Immediately on notification of the disdrarge, a Surface Crew was dispatdred to the pond <br />>p seal the riser by wrapping it with brattice ckNh to stop further d"sdiarge of ccal fines to <br />Foidel Creek. SimuNarreorsly, Enviramerrtal Staff praseded danrrstieam on Foidel <br />Creek 1p determine the dowrstream migration of coal fines with normal low-flows in the <br />stream, placing anchored boars at six dovurtstiearn locations in the stream 1p filter and <br />caphire anal fines 1b prevent their further migration. Coal fines had been carried <br />downsbearn approximately 2.8 miles by normal stiearrrflovvs tb a marshy area in the <br />vicinity of a road craning of the rail-line behind the original Ashley Rarrch base. There <br />was no further evidence of coal fines migration beknnr this point (based on visual <br />tirrbidity observations). <br />Water samples were oblairred at both the discharge of Sedimentation Pond E (prior to <br />sealing the user) and justdomrrstiearrr ofthe limit of the viable coal fines migration. The <br />doHrrrsb+earn sample was clear. After setting for 24-tours, ttie coal fines had settled out of <br />the "worstrase" discharge sample from Pond E, resulting in a slightly turbid decant <br />water in the upper portion of the sample botNe. The initial samples wen: sent-0ut today <br />for water quality analysis. Envirarrrrental Staff is continuing with sampling of the minor <br />flow at tine Pond E disdrarge and atseveral do+nrts6earr points on Foidel Cn~k. <br />