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GROUNDWATER OBSERVATION DATA WATTENBERG LAKES <br />Aggregate Industries <br />WELL NUMBER MWA 40 Degrees 01.31 North <br />Date Depth Measured PVC Rim Ground Water Depth Below Difference from Notes <br />Time (PVC rim to water) Elevation Elevation Elevation Original Ground Historic Levels <br />(ft) (ft) (ft) (ft) (ft) (ft) <br />01/16/13 12.80 4945.61 4943.03 4932.81 10.22 (1.70) Not dewatering. <br />02/20/13 <br />13.00 <br />4945.61 <br />4943.03 <br />4932.61 <br />10.42 <br />(0.50) <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 />13.20 <br />4945.61 <br />4943.03 <br />4932.41 <br />10.62 <br />(0.20) <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 />13.10 <br />4945.61 <br />4943.03 <br />4932.51 <br />10.52 <br />(0.10) <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 />12.10 <br />4945.61 <br />4943.03 <br />4933.51 <br />9.52 <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 />12.20 <br />4945.61 <br />4943.03 <br />4933.41 <br />9.62 <br />(1.70) <br />lined pit commenced 5/24/13. <br />07/24/13 <br />11.60 <br />4945.61 <br />4943.03 <br />4934.01 <br />9.02 <br />(2.10) <br />Pit dewatering from within slurry lined pit. <br />08/20/13 <br />11.40 <br />4945.61 <br />4943.03 <br />4934.21 <br />8.82 <br />(1.90) <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 />4945.61 <br />4943.03 <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 />10.20 <br />4945.61 <br />4943.03 <br />4935.41 <br />7.62 <br />(1.70) <br />dewatering from within slurry lined pit. <br />11/20/13 <br />10.70 <br />4945.61 <br />4943.03 <br />4934.91 <br />8.12 <br />(1.20) <br />Pit dewatering from within slurry lined pit. <br />N slurry wall breach repaired week of Dec. 16. Pit <br />12/09/13 <br />11.30 <br />4945.61 <br />4943.03 <br />4934.31 <br />8.72 <br />(0.80) <br />dewatering from within slurry lined pit. <br />Page 1 of 1 <br />