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~ ~ .~Jso. tension cracks should be monitored as [hey develop. Their progratioa and behavior •viil help <br />determine whether they are responding ro preaoitadoa mining activity, or other iatlueaces. Tansion <br />sack maps should be kept up-[o-date. When tension Qackt ue mapped. the end of each (feature <br />should be marked with dated fLlgging. thus, the progressiaa of previously mapped Qacks and the <br />development of crew sacks will be immediately noticed during future inspections. <br />1 <br />1 <br />1 <br /> <br /> <br />1 <br />1 <br />1 <br />