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• Where the "B" horizon is distinguishable from the <br /> "A" horizon (which is most shallow on' the steep slopes) , the <br /> "B" horizon consists , generally, of sandstone fragment soils <br /> over a layer of Mancos Shale . In some cases , the fragments <br /> are quite large . <br /> Construction of surface facilities began in the <br /> early 1950 ' s and nearly all predate the Federal Surface <br /> Mining Reclamation and Control Act of 1977 (P .L. 95-87) , <br /> with the exception of the portal facilities for the tunnel <br /> project . <br /> The only on-going and future surface disturbance <br /> anticipated is in the coal refuse disposal area, which will <br /> disturb an estimated three acres per year . <br /> • Prior to the passage of P .L . 95-87 , no requirement <br /> or request existed for the segregation or testing of soil <br /> horizons in the disturbed areas . Consequently the "A" and <br /> "B" horizons are well mixed in the pre-law disturbed areas . <br /> In construction of the tunnel ,. face-up work was <br /> done in accordance with the interim performance standards of <br /> the Office of Surface Mining and the Mined Land Reclamation <br /> Division . However, no distinct "A" and "B" Horizons could <br /> be identified due to the shallowness of the soil . <br /> The soils being removed for the disturbance <br /> associated with the coal refuse disposal area are somewhat <br /> deeper , and are being segregated according to soil horizon . <br /> • <br /> -5 <br />