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FUGRO CONSULTANTS, INC. <br />The surficial features at the site (shown in Figure 2) included ground depressions (possible sinkholes), <br />underground drainage points along the canal system, and a vertical air shaft (backfilled) associated with the <br />mine. The main objective of this Phase 2 ERT survey was to image the area above the mined coal seam at an <br />approximate depth of up to 15 meters along each profile. The north -south oriented survey lines extended from <br />just west of the ditch sinkholes to the east in order to capture any potential surface anomalies that could <br />transport groundwater to the east. Per a mine representative, approximately 10,500 gallons of water was <br />poured into depressions within the ground. This was done to increase the electrical conductivity of groundwater <br />pathways and increase their detectability by the electrical survey. Approximately 8,500 gallons were poured into <br />the main depressions (sinkholes) within the trench where it turns to the west. Another 2,000 gallons went into <br />the rock pile feature shown below. <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 />Project/Proposal No. 04.79160011 August 23, 2016 Page 3 of 7 <br />TR -69 A14-15-6 09/16 <br />