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2.05 APPLICATION F~ PERbffT FOR SURFACE OR UAIDII2GROUlID MINII3G ACTIVITIES - <br />MINIMUM R}7QUII2f1~0;LSPS FC~t OPERATION AND RDCLAMP,TION PLANS. <br />• 2.05.6 Mitigation of Surface Opal Mining Operation IIIIpaCtS. <br />(COnt'd.) <br />(6) (c) (i) (C) (Cont'd.) <br />permit and adjacent area will be monitored prior to and during <br />undermining. <br />Pre-mining structure surveys will occur prior to undermining and <br />will typically be completed on an annual basis until the <br />Division agrees that the subsidence monitoring within the <br />concerned area is adequate. <br />A permanent location or benchmark will be emplaced at each <br />structure. The station will be monitored in conjunction with <br />the subsidence monitoring stations and will be completed using <br />standard survey techniques and equipment. Information gathered <br />will include accurate horizontal and vertical locations, and <br />general interior-exterior inspections, where ownership <br />permission is obtained (refer to sample inspection sheet, <br />Subsidence Repair Handbook). In this fashion, any deflection or <br />Vertical settlement will be monitored along with any other <br />manifestations of subsidence (fractured drywall, ill-fitting <br />doors and windows, plumbing leaks, etc.). COVCC believes any <br />subsidence caused damage can be promptly rectified on a case-by- <br />. case basis, using economically and technologically feasible <br />means. For additional monitoring information, refer to the <br />Stil~sidence Repair Handbook, Volume 3. <br />(D) Structure monuments will be surveyed and structure inspections <br />will typically be conducted on an annual basis. The initial <br />survey for each structure to be undermined will be conq~leted <br />prior to the commencement of retreat mining within the projected <br />angle of draw (conservatively estimated at 20.5 degrees) <br />encompassing each structure location. <br /> <br />PR 93-03 Revised 09/17/93 <br />148 <br />