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HBET reviewed the second Fugro report and came to the following conclusion: <br />As indicated in the attached report, the geophysical survey identified a <br />linear, horizontal anomaly that extends from the surface sinkhole <br />openings in the trench to the vertical anomaly previously identified. Based <br />upon all of the available data, HBET believes that the horizontal anomaly <br />represents the pathway from the sinkhole openings to the old air shaft. <br />The recent survey also identifies a horizontal anomaly north of the air <br />shaft. However, the anomaly does not appear to connect to the air shaft. <br />In addition, no surface sinkhole expression was observed in this area. <br />Although the survey identified two horizontal anomalies, the data did not <br />identify any horizontal anomaly extending from the rock pile feature <br />discussed in the report. As indicated in the referenced Fugro report, water <br />was dumped into this feature and as a result, HBET would have <br />anticipated that any horizontal anomaly extending from this location <br />would be identified during the survey. (See HBET report dated August 25, <br />2016 located in Appendix 14-15) <br />The air shaft was constructed in the 1979 time frame to ventilate a mining area known <br />as the northwest section, also know as C-section. According to the old mine maps, C- <br />section was mined out in September 1979. It appears the shaft was constructed post <br />law (after August 3, 1977) but prior to the 1981 permit issuance. <br />The Operator does not have any detail on how the shaft was constructed or how the <br />shaft was sealed. It is likely the shaft was sealed by dumping soil and rock into the shaft <br />until it was filled to the surface. A void in the shaft could have been created by settling <br />of the backfill. <br />The Fugro reports show the extent of the hydrologic communication are the old air shaft <br />and the near surface anomalies extending between the trench and the old shaft. The <br />following repair plan will stop the hydrologic communication between the underground <br />workings of the Roadside Mine and the properties overlying these workings that belong <br />to Mr. Rudolph Fontanari and Mr. Jason Carey <br />Air Shaft Repair and Pathway to the Air Shaft <br />The Operator proposes to use a large backhoe to excavate the area from the Fontanari <br />trench to the shaft as shown on Figure 14-17. The excavation should uncover the near <br />surface anomalies that run from the trench to the shaft. The shaft will be excavated 16 <br />feet deep. A 12 -inch thick low slump concrete slab will be placed to seal off the shaft <br />at this elevation. The native soils excavated from the area should be void of rocks larger <br />than 6 inches and placed in compacted lifts back up to original grade. <br />TR -69 14-34 12/16 <br />