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AUG 17 190 16:24 T.K.D.H. & PSSOC. P.2 KING, , ANPlRSON 7" D AND ASSOCIATES, IN4dRPORATE D ENGINEERS ARCNITIOT5 KANNORS asoo AMemAN NATIONAL BANK BUILDING SAINT PAUL. MINN99TA 40191 elanaaawo August 17, 1990 PAxe,enoe.006t Honorable Mayor and City Council Lake Elmo, Minnesota Re: Alternate Watenmain Route SW-1 Water System Lake Elmo, Minnesota Conunission No, 9150-000 Dear Mayor and Council: At the informational meeting held August 14, we were instructed to investigate the feasibility of using Ideal Avenue (CSAH 13) and TH 5 right-of-way Instead of Lake Jane TraiL We have not made a detailed investigation yet but thought we would pass on some of the Information gathered to date. Firstly, the alternate route would require a 6" diameter watermain just like Lake Jane Trail, I was concerned that the longer distance of the alternate route would require a larger size, but that Is not the case, The alternate route is considerably longer at 3,570 feet additional length. 6" watermahn was estimated at $13 per foot; therefore, the additional pipe cost for the longer route is estimated to be $460410. This cost could be justified if the alternate route saved a corresponding amount of restoration. This additional pipe cost represents 58% of the entire restoration allowance; therefore, we doubt if the alternate route could be shown to be cost effective, Secondly, the alternate route has its own construction difficulties. We know that the Ideal Avenue ditches are very steep and deep. Installing a watermain. In the ditches would be difficult and re-establishing those steep ditches would be worse. We know the County would not allow us to tear up the blacktop. We do not see any difficulties in the TH 5 right-of-way; however, we would have to cross an Amoco 10" petroleum pipeline twice, once on Ideal Avenue and once on TH 5. A contractor must take special precautions crossing pipelines. Lastly, the alternate route would not lend itself to future connections, if needed or desired. No one is advocating additional connections outside the service area at this time, but the Lake Jane Trail route would allow the City to consider hook-ups on a case by case basis if someone's well goes dry or becomes contaminated. The alternate route abuts only about six homes on Ideal Avenue.