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FUGRO CONSULTANTS, INC. <br />The surficial features at the site included sinkholes or ground depressions, underground drainage points along <br />the canal system, and a vertical air shaft associated with the mine. The main objective of the ERT survey was to <br />image to the mined coal seam at an approximate depth of 100 ft along each profile, while incrementing each of <br />the north -south oriented survey lines to the east in order to capture any potential surface anomaly that could <br />intersect the mine workings. Per a mine representative, approximately 10,000 gallons of water was poured into <br />the trench, which flowed into the subsurface through several sinkhole openings to help illuminate potential <br />pathways. <br />K <br />y <br />.rA •_ <br />�_•ice ~_� J� ^- <br />Figure 3 shows a backfilled sinkhole immediately west of the buried 8 inch non-metallic water line. A metal <br />marker post for the water line can be seen in the upper left side of the photo. <br />ProjecVProposal No. 04.79160011 <br />25 April, 2016 Page 3 of 6 <br />TR -69 A14-14-8 09/16 <br />