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~5 ~ <br />• ®~ <br />Adequacy Items <br />SFIB AGRA Project E92-7075 <br />Page B <br />The primary structural impacts of air overpressure is glass breakage. Limits on air overpressure <br />are established well below levels that could potentially damage lazge, unsupported panes of <br />glass. Th glow level of stress induced in glass by air overpressure combined with elastic <br />behavi of glass at those low stress levels results in a negligible potential for cumulative <br />im s of repeated blasts. <br />re you willing to commit to pre-blast surveys to be completed for all buildings within the <br />r vicinity (to be defined) of the mine before initial blasting can start? This would include a <br />aseline assessment of the condition of the buildings before blasting. <br />G~(\~ Southwestern Portland Cement is committed to completing pre-blast surveys for adjacent <br />J ` ~ structures in accordance with Office of Surface Mining Reclamation and Enforcement <br />equirements as presented in the "Blasting Guidance Manual" (Rosenthal and Morlock, 198'n. <br />5. ibit E -Reclamation Plan <br />mentioned under Exhibit D - Mining Plan, please provide acreages of all classes of <br />disturbed land, volumes to be moved, haul distances, and haul grades (in percent) at the <br />point of maximum disturbance ou the site during the life of the mine. <br />The response to this comment was provided under item 3.d. above. <br />~~ <br />age 4 -How many acres will be ripped at the time of maximum disturbance during the <br />hfe of the mine? Please explain what "cultipacked" means when referring to seedbed <br />preparation. <br />The response is provided in Attachment 9, <br />Page 5 -Under wooded wetland you state "...substrates in which these (trees and shrubs) <br />will be placed will be 15-20 inches of topsoil, with surface elevations set slightly ((r12 <br />inches) above water table to allow roots "breathing space". How will this be monitored and <br />assured? <br />he response is included in Attachment 9. <br />Page 5 -Cottonwood groves -How will you maintain enough moisture here to support <br />cottonwood groves? <br />The response is included in Attachment 9. <br /> <br />L~ A G R A <br />EsrM & Environments/Group <br />