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Lyster Pit <br />Moffat County, Colorado <br />o The operator has subsequently <br />Company, which I understand you <br />wells between the ditch and the pit. <br />Page 3 of 4 <br />July 15, 2008 <br />obtained a letter from the Deep Cut Ditch <br />have. Thus, we have eliminated the monitor <br />5. With regards to the domestic well just west of the property (well #20 on Figure), we've <br />added a monitoring well along the west pit boundary. <br />6. Similarly, we've moved the two proposed monitoring wells just east of the pit, to east of <br />the pit and south of the Highway. See Figure 1. These will provide monitoring of the <br />groundwater table to the east of the pit, near wells 9, 10 and 11. Note that only well # <br />11 has a completion report. The well was drilled to 760 feet deep. <br />7. As for the length of monitoring to establish a baseline, here's our observations, thoughts <br />and suggestions: <br />o The groundwater table is seasonally influenced by irrigation. <br />o Monitoring irrigation induced groundwater from the peak of the water table (this <br />summer) to when it drops to its lowest point (wintertime, likely in Nov-Dec+-), will <br />tell us the entire fluctuation in the water table. <br />o Monitoring the water table beyond this time will only show what the irrigation <br />response time is next spring, and how rapidly the soils respond to snowmelt. If <br />we know the seasonally high and low groundwater levels, that will tell us what we <br />need to know regarding seasonal fluctuation of the alluvial aquifer. <br />o The extent of drawdown surrounding the pit will likely vary significantly. We do <br />not anticipate that measurable drawdown will occur more than several hundred <br />feet from the pit. This is by virtue of the aquifer actually being an aquitard that <br />has layers of silt and clay interspersed with the gravels. Also, its an unknown <br />how continuous and contiguous the gravels actually are outside of the pit area: <br />However, based on logs from the pit, there's clays and silts interspersed with the <br />gravels, and thus we can extrapolate that the same is true outside of the pit. <br />Thus, we'd like to request that baseline groundwater monitoring occur from <br />essentially now (July/August) to Nov/Dec, when groundwater levels should at the <br />seasonally low level. <br />Attached is a revised Figure 1, which shows proposed monitoring wells, three wells total. <br />We're proposing that the wells be monitored at least monthly from now until December 2008, <br />and that they be monitored per the Divisions recommendations after that time. <br />Ak <br />WATER RESOURCE CONSULTANTS, LLC