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• • iii iiiiiiiiuiuiii <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room ? 15 ~r~~~ <br />Denver, Colorado 80203 I <br />Phone: 1303) A66-3567 <br />FAX: 13031 832-8106 <br />DEPARTMENT OF <br />NATURAL <br />Date: June 19, 1996 RESOURCES <br />To: NOV C-96-O1~ File Dove pore, <br />/p lames 5. Lochhead <br />From: David Ber /~ Etecvove Dneuor <br />Michael B. Lung <br />Division Dueclor <br />Re: Material Balance/Subsoil Salvage <br />The following calculations summarize the probable subsoil volumes covered, and subsequently <br />salvaged following the field observations of June 13, 1996, leading to issuance of NOV C-96-013. <br />Estimated amount of subsoil covered by refuse at the northwest corner of the Lower Refuse Pile: <br />(Berry assumes subsoil depth = 24 inches) <br />27 ft x 30 ft x 2 ft = 60 yds3 <br />(Avery assumes subsoil depth = 18 inches) <br />27 ft x 30 ft x 1.5 ft = 45 yds' <br />The area dimensions of 27 ft x 30 ft were agreed by Berry (DMG), Barbe and Avery (MCC) in <br />the field on June 13, 1996. Assuming that Avery's estimate of depth is correct, a minimum of <br />•35 yds' of subsoil were buried when the dozer operator pushed the refuse material ramp over the <br />unsalvaged subsoil at the northwest corner of the Lower Refuse Pile on June 13, 1996. <br />Avery estimates and Berry agrees that once abatement activities were completed, to the extent <br />possible (on June 13, 1996), a subsoil pile of approximately 25 ydsB was created by the salvage <br />operation. This pile resulted from efforts conducted by the dozer operator to separate the buried <br />subsoil from the refuse, and from additional salvage conducted adjacent to and north of the buried <br />area. <br />Avery estimates and Berry agrees that the salvage activities included a total area of about <br />55 ft x 33 f[, including the 27 ft x 30 ft area buried by refuse. <br />Assuming that a total approximate volume (55 ft x 33 ft x 1.5 ft) of about 100 yds' could be <br />salvaged, it appears that as much as 75 yds' were lost due to this violation. At the least, we can <br />he certain that the buried area involved, at a minimum, 45 ydsB of buried subsoil. This indicates a <br />minimum probable loss of soil of about 20 yds'. <br />DAB/bjw <br />\env\C96013.DAe <br />