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GROUNDWATER OBSERVATION DATA WATTENBERG LAKES <br />Aggregate Industries <br />WELL NUMBER MW-4 40 Degrees 01.17 North <br />104 Degrees 49.63 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 />7.80 <br />4939.35 <br />4936.59 <br />4931.55 <br />5.05 <br />(0.50) <br />Not dewatering. <br />02/20/13 <br />7.70 <br />4939.35 <br />4936.59 <br />4931.65 <br />4.95 <br />0.30 <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 />03/25113 <br />7.50 <br />4939.35 <br />4936.59 <br />4931.85 <br />4.75 <br />0.00 <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 />7.40 <br />4939.35 <br />4936.59 <br />4931.95 <br />4.65 <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 />05/22/13 <br />7.60 <br />4939.35 <br />4936.59 <br />4931.75 <br />4.85 <br />(0.10) <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 />7.50 <br />4939.35 <br />4936.59 <br />4931.85 <br />4.75 <br />0.00 <br />lined pit commenced 5/24/13. <br />07/24/13 <br />7.40 <br />4939.35 <br />4936.59 <br />4931.95 <br />4.65 <br />0.10 <br />Pit dewatering from within slurry lined pit. <br />08/20/13 <br />7.10 <br />4939.35 <br />4936.59 <br />4932.25 <br />4.35 <br />0.40 <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 />09/12113 <br />4939.35 <br />4936.59 <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 />7.20 <br />4939.35 <br />4936.59 <br />4932.15 <br />4.45 <br />(0.20) <br />dewatering from within slurry lined pit. <br />11/20/13 <br />7.50 <br />4939.35 <br />4936.59 <br />4931.85 <br />4.75 <br />0.00 <br />Pit dewatering from within slurry lined pit. <br />N slurry wall breach repaired week of Dec. 16. Pit <br />12/09/13 <br />7.70 <br />4939.35 <br />4936.59 <br />4931.65 <br />4.95 <br />(0.20) <br />dewatering from within slurry lined pit. <br />Page 1 of 1 <br />