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TO* <br />COFFIN &. GRONBERG. INC. <br />SUnvEYINQ. KNQINEERINQ ANO CANO PLANNING <br />482 A tamarack avenue <br />long lake . MINN 39350 <br />473-414 1 <br />Dacesiber 11, 1990 <br />City of Orono <br />F. 0. Box 66 <br />Crystal Bay MN 55323 <br />Attn: Mark Bernhardsor. 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. Aiter <br />having Woodhill install a water meter, we found that peak flows <br />exceed 11,000 GPD. Mound systems can only handle 1,000 - l.zuu <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 « <br />appropriate for drainfield systems (as shown on attached pchibit A <br />from a 1978 drainage study). It would be very di.,.^icult to find <br />enough areas meeting che criteria for mound systems. Constructing <br />a pumping system to reach 10 remote and separace mound sites would <br />be very complex and disruptive to the grounds and golf course. <br />After checking with the City of Waysata, 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 lo <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 OLD®"*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 imsuitable 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