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stresses, including humidity and temperature changes, settlement from consolidation and variations in <br />ground moisture, wind and even slantnting a door. If the stucco was not kept wet until set or there was <br />too much cement in the stucco, small-large cracks could occur. Basement walls could crack if the <br />backfilled material was not compacted properly or if the concrete was allowed to freeze before it se[ or <br />any of the hundreds of other conditions that cause cracking, or damage, to a structure. <br />The Division cannot be concerned with all the conditions that, ultimately, will damage a structure. Only <br />those activities that are regulated by the Mined Land Reclamation Act will be considered. Blasting is a <br />mining activity that comes under the jurisdiction of the Division. Pursuant to Rule 6.5(4), operators shall <br />demonstrate through appropriate blasting, vibration, geotechnical and structural engineering analyses, <br />[hat off-site areas will not be adversely affected by blasting. Adequate demonstration shall be in the form <br />of one of the available Compliance Options outlined in the OSM Blasting Guidance Manual. OSM <br />threshhold limits are part of the compliance options. The operator, in my opinion, submitted sufficient <br />data to adequately demonstrate that the ground nto[ion, airblast and maximum charge weight limits were <br />never exceeded during the 5-8-97 through 11-14-97 blasting period. So, therefore, the operator is in <br />compliance with the Act and/or the Rules and Regulations. <br />It is suggested that the operator attempt to keep the airblast noise below the annoyance level (110 dBL). <br />This may reduce complaints. Also, [he operator needs to report accurate weather data on each of the <br />blasting shot records (or some other document). <br />You should have the operator monitor the Bowie home during all future blasts (or until the complaints <br />stop). <br />