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July 2019 18107649 <br /> Table 1: Monitoring Well Construction Summary <br /> ' Elevation Elevation Well s Screened Filter Pack Bentonite <br /> Well , Northing , Concrete Well Material Well Depth 4 Interperted <br /> Fasting _(feet) PVC Top , Installation Interval Interval Seal Interval <br /> No. (feet) Pad Top s Type (ft bgs) Screened Unit <br /> (feet) feet Date (ft bgs) (ft bgs) (ft bgs) <br /> MW-1 3097466.02 1486791.74 5272.09 5269.95 6/2/1998 2"/SCH40 65.9 45.90 5 - 26 1 - 5 Niobrara/Codell <br /> PVC Contact <br /> MW-2 3097623.12 1487456.76 5266.03 5263.95 6/1/1998 2"/ SCH40 112 89 87 - 109 81.5 - 87 Niobrara/Codell <br /> PVC Contact <br /> MW-3 3097728.68 1486250.38 5261.03 5258.8 6/1/1998 2"/SCH40 107.2 84 81.5 - 113 77.5 - 81.5 Niobrara/Codell <br /> PVC Contact <br /> MW-4 3098893.31 1484259.44 5246.13 5243.77 April, 1999 2 /PVC SCH40 188.3 168 unknown unknown unknown <br /> MW-5 3097213.94 1489893.21 5276.42 5273.86 11/30/2012 2 /PVC 40 57.4 37.3 35.2 - 57.4 32.7 - 35.2 Silt Overburden <br /> MW-6 3098238 1486747.45 5239.68 5237.64 12/19/2012 4 /PVC SCH40 229.7 209.4 205.5-231.1 203.0-205.5 Niobrara <br /> 1 MW-7 3098804.41 1484797.04 5219.61 5217.22 12/15/2012 4 /PVC40 259.2 238.8 236.1-259.2 231.2-236.1 Niobrara <br /> ' Notes: 1-Coordinates are in Colorado State Plane North Grid NAD 83 and elevations are on NAD 88 datum. Top of well pads about 6 inches above land surface. <br /> 2- MW-5 through MW-7 installation date is date the well,filter pack and grout placement were installed in the borehole, but completion with concrete pad, bollards and <br /> protective steel riser was conducted at a later date. <br /> 3-Well total depths for MW-1 through MW-4 measured by Golder 7/30/2010 from the top of the PVC well casing top; bls= below land surface. Borehole and well <br /> ' construction logs were unavailable for MW-4. Information provided for MW-4 was obtained from a video survey of the well performed on July 30, 2010. MW-1 well casing <br /> likely extended sometime after construction based on differences in drilled depth based from borehole log and total depth measurement made 7/30/2010;was reduced by <br /> 0.30 feet on 01/10/2013 to enable closing and securing the steel protective riser lid. <br /> 4-Screened interval is the depth interval of the nominal length of the screen pipe section, and not the actual measured length of the perforations provided on the well <br /> construction diagrams. <br /> 1 <br /> 1 <br /> ' GOLDER 1 <br />