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FROX • <br />I ' MEMORANDUM <br />T0: Mike Hart - Flatiron Companies <br />FROM: sob ldrogden <br />DATE: Auqust 4, 1977 <br />N o.2+.1951+~+5 <br />JOB k2071.P.00 <br />SUBJECT: Well Locations and Water Table Drawdowns, <br />Greeley West travel operation <br />Enclosed please find a map and a list of wells that are located in <br />the vicinity of xour gravel operations. Numbers on the list are <br />keyed to numbers on th6 map. Both the list and the map may help <br />you determine which wells Flntirona Company owns and which wells <br />may be impacted by the drawdowna. There may be additional wells <br />in the area because of the large number of houses shown on the map. <br />P.10 <br />We have calculated the drawdowns that will extend up gradient from <br />the lake. The drawflowns will be Created by forming an outlet from <br />the lake to the Cache la Poudre River whicYr will lower the lake level. <br />For the purpose of calculations we assume that a lowering of five <br />feet was all that cpuld be obtained by gravity drainage. Of course, <br />a pump may be used to lower the water level even more and the draw- <br />downs will be prpportionately greater. The drawdowns extending up <br />gradient or to the west end south from the lake are shown in the <br />table below: <br />DRAWDOWNS AT DISTANCES FROM LAKE EDGE <br />Distance, in Feet Drawdown, in Feet Peroent Water Available <br />Lake Edge 5 l3 <br />500 3.6 9 <br />1000 2.2 6 <br />1500 1.0 3 <br />1875 0 0 <br />The table indicates that moat of the drawdown occurs within SOO feet <br />of the lake. TherC will be no drawdown or no impact on water levels <br />at distances greater than 1875 feet from the lake. When the magni- <br />tude of these drawdowns are compared with the magnitude of the water <br />r'C1 LconerdRlcaConsutlingWnlerEnoineele,Inc. <br />