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2.05 APPLICATION FYH2 PEE2DIIT FCH2 S[7RFACE OR UrIDERCdtOUDID MII4ING PvCTiVITIES -- <br />MINIMOM RE7QUII2II+IEN1'S FC%2 OPERATION AND RDCLAMP,TION PLANS. <br />2.05.6 Mitigation of Surface Coal Mining Operation impacts. (Cont'd.) <br />(6) (f) (ii) (B) (iii) (Cont'd.) <br />Structures located near projected undermining within Lease COC-37210 <br />are discussed in special stipulation "1" which states a 300 foot buffer <br />zone will be maintained around occupied structures. Strain projections <br />derived by Geo-Hydro Consulting (Subsidence Appendix, Volume 3) <br />indicate material damage or diminution will not occur. Structures <br />located within the Lease COC-37210 area generally overlie the "D" coal <br />seam at depths less than 850 feet. II~loying a draw angle of 20.5 <br />degrees, the area of subsidence influence is approximately 320 feet. <br />The coincidental concurrence between federal lease stipulation "1" and <br />site conditions at Orchard Valley will minimize structural damage due <br />to reduced strains and predicted tilt. <br />Buffer zones of limited mining are left below areas defined as <br />Renewable Resource Lands in Stevens Gulch and East Roatcap Creek. <br />These zones are required by federal lease COC-37210 stipulation "g". <br />Only access entryways are permitted through these zones. <br />Structures located near projected undermining within Lease COC-53356 <br />are protected by virtue of the overburden thic3mess occurring at these <br />locations. All structures identified in this lease area occur in areas <br />• of over 2000 feet of overburden cover. Employing the subsidence <br />projections developed by Geo-Hydro Consulting, only slight to <br />negligible damage is to be expected at these structures. COVCC <br />believes any subsidence caused damage can be promptly rectified on a <br />case-by-case basis, using economically and technologically feasible <br />means. <br />(6) (f) (ii) (C) <br />~VCC does not anticipate using measures on the surface to: prevent <br />material damage; prevent the lessening of value; or to prevent the <br />diminution of reasonable foreseeable use (refer to Section 2.05.6 (6) <br />(f))• <br />(6) (f) (ii) (C) (I) <br />Reinforcement of sensitive structures or features is not anticipated <br />(refer to Section 2.05.6 (6) (f)). <br />(6) (f) (ii) (C) (II) <br />Installation of footers designed to reduce damage caused by ground <br />movements is not anticipated (refer to Section 2.05.6 (6) (f)). <br />~~ <br />PR 93-03 Revised 04/17/93 <br />160 <br />