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COFFIN & GRONBERG, INC. <br /> SURVEYING,ENGINEERING AND LAND PLANNING <br /> 482-A TAMARACK AVENUE <br /> LONG LAKE,MINN.85388 <br /> 473.4141 <br /> December 11, 1990 <br /> City of Orono <br /> P. 0. Box 66 <br /> Crystal Bay MN 55323 <br /> Attn: Mark Bernhardson and John Gerhardson <br /> Re: WOODHILL COUNTRY CLUB SEWER CONNECTION <br /> Dear Mark & John: <br /> We first looked at the possibility of using a new drainfield <br /> system to treat the effluent from Woodhill Country Club. After <br /> having Woodhill install a water meter, we found that peak flows <br /> exceed 11,000 GPD. Mound systems can only handle 1,000 - 1,200 <br /> GPD in any one location because any additional volume raises the <br /> groundwater elevation under the mound area causing hydraulic fail- <br /> ure. This is known as "groundwater mounding" . Thus, we would <br /> need about 10 different sites to put in the mounds required. <br /> Most of the Woodhill site is wooded, hilly, prone to flooding <br /> or is located in golf fairways, greens or tees which makes it in- <br /> appropriate for drainfield systems (as shown on attached Exhibit A <br /> from a 1978 drainage study) . It would be very difficult to find <br /> enough areas meeting the criteria for mound systems. Constructing <br /> a pumping system to reach 10 remote and separate mound sites would <br /> be very complex and disruptive to the grounds and golf course. <br /> After checking with the City of Wayzata, we found two pos- <br /> sible connections to their sewer at this time. One connection <br /> would be near the lift station just south of Wayzata Country Club <br /> near old Highway 12, and the other being south of County Road 15 <br /> at the west end of Peavey Lane near the cul-de-sac. <br /> The first option to the lift station would involve ap- <br /> proximately 4,000 feet of sewer line with jacking required under <br /> the Burlington Northern Railroad, NEW U.S. Hwy. No. 12 and OLD <br /> U.S. Hwy. No. 12, and would also involve getting approval from <br /> those owners as well as approval from Wayzata Country Club to <br /> cross their parcel between the two highways. Also, some pumping <br /> stations would be needed and depending on the route allowed ( if at <br /> all) , some unsuitable soils and additional length could be encoun- <br /> tered. <br /> The second option to Peavey Lane would involve cutting <br /> through the center of the golf course with its many irrigation and <br /> draintile lines, under the Dakota Rail, West Lake Street and <br />