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Derek Slack and Neil Thomson <br /> June 24, 2020 <br /> Page 2 <br /> Activities to Identify Water Source <br /> It is necessary to identify the source or sources of the water collecting at Sandy Acres Pit before a <br /> solution for mitigation can be identified and implemented. To that end, E-470 has taken the <br /> following actions since the ponding issue was first identified in 2019: <br /> • Reviewed historical aerial imagery and topographic mapping <br /> • Reviewed mapping of storm drainage systems that may direct surface water to or through <br /> Sandy Acres <br /> • Performed field investigations to identify possible point inflows for surface runoff <br /> • Reviewed local precipitation data for correlation with inflows to Sandy Acres <br /> • Reviewed diversion records for the Fulton Ditch,which traverses to the east of Sandy Acres <br /> • Communication with owner of raw water transmission line adjacent to Sandy Acres pit <br /> • Reviewed available data from nearby water wells <br /> • Identified locations of nearby slurry walls and lined reservoirs <br /> • Initiated monitoring well program at Sandy Acres to gain better understanding of ground <br /> water patterns in the vicinity of Sandy Acres. <br /> Sandy Acres Monitoring Well Program <br /> In March 2020, E-470 installed six monitoring wells (monitoring holes) within and around the <br /> Sandy Acres property. The locations for the monitoring holes were selected with assistance from <br /> BBA and were constructed by Kumar & Associates, Inc. and their subcontractors. The six new <br /> monitoring wells are as follows: <br /> WELL NO. WELL PERMIT NO. TOTAL DEPTH TOP ELEV. <br /> MW-1 MH-60550 43.0 feet 5024.90 <br /> MW-2 MH-60550 49.0 feet 5033.78 <br /> MW-3 MH-60550 44.75 feet 5038.32 <br /> i <br /> f <br /> MW-4 MH-60550 49.0 feet 5033.32 <br /> MW-5 MH-60550 45.0 feet 5029.13 <br /> MW-6 MH-60554 35.0 feet 5014.51 <br />