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Adequacy Items <br />SIiB AGRA Project E92-7075 <br />~~~ Page 8 <br />i' Bi <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 large, unsupported panes of <br />glass. Th %low level of stress induced in glass by air overpressure combined with elastic <br />behave of glass at those low stress levels results in a negligible potential for cumulative <br />im of repeated blasts. <br />re you willing to commit to pre-blast surveys to be completed for all buildings within the <br />t 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 />SJV <br />~(\~ <br />Southwestern <br />Portland Cement <br />is committed to completing <br />pre-blast surveys <br />for adjacent <br />~ ~ structures in accordance with Office of Surface Mining Reclamation and Enforcement <br />~T uirements as presented in the "Blasting Guidance Manual" (Rosenthal and Morlock, 1987). <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 on the site during the life of the mine. <br />The r nse to this comment was provided under item 3.d. above. <br />ge 4 -How many acres will be ripped at the time of maximum disturbance during the <br />life of the mine? Please explain what "cultipacked" means when referring to seedbed <br />preparation. <br /> <br />The response is provided in Attachment 9, <br />Page S -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 (6-12 <br />inches) above water table to allow roots "breathing space". How will this be monitored and <br />assured? <br />response is included in Attachment 9. <br />Page 5 -Cottonwood groves -How will you maintain enough moisture here to support <br />cottonwood groves? <br />~1~ie response is included in Attachment 9. <br />L, A G R A <br />Earth & Emironmenrsl Group <br />