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<br />eastern boundary of the subdivision, tieing in the remaining portion of the existing <br />drain,and will connect to the existing drain (Tile Drain #5) located on the southern <br />portion of the subdivision. <br />Tile Drain #5 that originates to the east of Ce112 and flows to the southwest will be <br />intersected by the mining operation. The portion of the drain that is located in Cell 2 will <br />be removed. The portion of the drain that is [o the west of Cell 2 will remain intact and <br />continue to flow to the west. The portion of the the drain that lies to the east of Cell 2 <br />will be incorporated into a new drain that will originatejust south of "O" Street and run <br />to the south following the section line between Sections 32 and 33. This new drain will <br />tie into the replacement drain for Tile Drain #9 that will be discussed later in this report. <br />Tile Drains #6, 7, and 8, which are located on Mr. Goetzel's property in the northwest <br />comer of Section 33, will remain intact and will not be affected by the mining operation. <br />Tile Drain #9 which paralells the northern boundary of the lower portion of Cell #2 may <br />or may not be physically affected by the mining operation. The exact location of [he <br />drain could not be determined and therefore it is unknown whether the drain lies on Mr <br />Goetzel's property or within Cell 2. To ensure that proper drainage is maintained in this <br />area a new drain will be constmcted along the northern boundary of Cell 2. This drain <br />will also have an additiona125%aoss-sectional area in comparison [o the existing drain <br />and if the existing drain is not altered by mining, this drain will supplement the existing <br />structure. <br />A new drain will be installed that will originate to time north of Ce114 and flow to the <br />west paralleling "O"Street. This drain will continue along the northern boundary of Celt <br />6 to the intersection of "O" Street and 83" Avenue. At this point the drain will turn south <br />and will daylight into [he reconfigured drainage channel (Storm Lake Drain). This drain <br />will eliminate any potential ground water mounding that may occur due to the installation <br />of a liner in this area. <br />All of the new drains will be constructed at the same elevation as the existing drain that <br />they aze replacing or at listoric ground water levels as indicated by the monitoring plan. <br />This will allow for the historic ground water levels to be maintained. <br />In response to Concern #7 listed under Exhibit G -Water Information regarding the <br />characteristics of the alluvial aquifer, please find attached the following information. Figure 2 <br />illustrates the water levels and depth of the aquifer for the site. The water levels and depth of <br />alluvial material were obtained from the soil borings for the site. The soil borings for Cells <br />1,3,4,S,and 6 were completed in 1988 with the borings for Ce112 completed in 1999. The depth <br />to groundwater varies acrosss the site with the uplands portion of the site having a greater depth <br />to groundwater.The average depth to groundwater is approximately 4-5 feet across the site. The <br />flow direction of the groundwater is approximately south-southeast as indicated by the flow <br />arrows on Figure 2. The depth of the alluvium varies form 12-40 feet across the site. The <br />/~ approximate transmissivity for the site is 120,000 gpd/ft. This value was determined from the <br />USGS Groundwater Circular No. 11 with Location No. B6-66-34bab2 used as the reference <br />