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GROUNDWATER OBSERVATION DATA WATTENBERG LAKES <br />Aggregate Industries <br />WELL NUMBER MW -8 40 Degrees 00.91 North <br />104 Degrees 50.60 West <br />Date <br />Depth Measured <br />PVC Rim <br />Ground <br />Water <br />Depth Below <br />Difference from <br />Notes <br />Time <br />(PVC rim to water) <br />Elevation <br />Elevation <br />Elevation <br />Original Ground <br />Historic Levels <br />(ft) <br />(ft) <br />(ft) <br />(ft) <br />(ft) <br />(ft) <br />01/16/13 <br />13.40 <br />4949.59 <br />4946.77 <br />4936.19 <br />10.58 <br />(1.40) <br />Not dewatering. <br />02/20/13 <br />13.70 <br />4949.59 <br />4946.77 <br />4935.89 <br />10.88 <br />(1.20) <br />Not dewatering. <br />Slurry wall construction commenced in March, <br />w /water being pumped from existing excavated <br />pond (starting March 13) to betonite slurry pond. <br />Construction commenced @ Station 60 on E side <br />just S of conveyor bridge /exisiting excavation & <br />continued to N boundary, then W toward W <br />03/25/13 <br />13.80 <br />4949.59 <br />4946.77 <br />4935.79 <br />10.98 <br />(0.30) <br />boundary. <br />Slurry wall continued across N boundary then S <br />along W boundary to Station 17 +50 as of 4/29/13. <br />Water being pumped from existing excavated pond <br />04/19/13 <br />13.60 <br />4949.59 <br />4946.77 <br />4935.99 <br />10.78 <br />(0.60) <br />to betonite slurry pond. <br />Slurry wall continued S along W boundary then E <br />along S boundary to Station 96 +97.86 as of 5/30/13. <br />Water being pumped from existing excavated pond <br />05/22/131 <br />12.80 <br />4949.59 <br />4946.77 <br />4936.79 <br />9.98 <br />(030) <br />to betonite slurry pond. <br />Slurry wall continued E along S boundary then N <br />along E boundary to Station 59 +64.73 as of 6/17/13 <br />(slurry wall completion date). Water being pumped <br />from existing excavated pond to betonite slurry pond <br />through 6/13/13. Pit dewatering from within slurry <br />06/26/13 <br />12.20 <br />4949.59 <br />4946.77 <br />4937.39 <br />9.38 <br />(0.70) <br />lined pit commenced 5/24/13. <br />07/24/13 <br />12.60 <br />4949.59 <br />4946.77 <br />4936.99 <br />9.78 <br />(1.60) <br />Pit dewatering from within slurry lined pit. <br />08/20/13 <br />12.50 <br />4949.59 <br />4946.77 <br />4937.09 <br />9.68 <br />(2.00) <br />Pit dewatering from within slurry lined pit. <br />S Platte flooded site; slurry wall breached in 1 area <br />on E boundary & 1 area on N boundary. Pit <br />09/12/13 <br />4949.59 <br />4946.77 <br />#VALUE! <br />dewatering from within slurry lined pit. <br />E slurry wall breach repaired week of Oct. 14. Pit <br />10/22/13 <br />11.70 <br />4949.59 <br />4946.77 <br />4937.89 <br />8.88 <br />(1.70) <br />dewatering from within slurry lined pit. <br />11/20/13 <br />11.80 <br />4949.59 <br />4946.77 <br />4937.79 <br />8.98 <br />(1.30) <br />Pit dewatering from within slurry lined pit. <br />N slurry wall breach repaired week of Dec. 16. Pit <br />12/09/13 <br />12.20 <br />4949.59 <br />4946.77 <br />4937.39 <br />9.38 <br />(0.70) <br />dewatering from within slurry lined pit. <br />Page 1 of 1 <br />