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<br /> MSJ~ <br /> . (VM'ltnW!GIG <br /> March 9, 1994 <br /> File: 520-049-70 <br /> Mr. Dan Winkel <br /> Public Works Supervisor <br /> City of Arden Hills <br /> OVIl ENG;NEEitl\,'G 1450 West Highway 96 <br /> Arden Hills, MN 55112-5794 <br /> EN;:tC~I.\~fN~Aj RE: TWIN CITIES ARMY AMMUNITION PLANT (TCAAP) INTERCEPTOR <br /> MUN:CiP.4j Dear Mr. Winkel: <br /> PV.NNlNG It is my understanding that the City of Arden Hills is considering over-sizing of that portion <br /> of the new interceptor under Interstate 35W. <br /> srl'.JCI,;'A1 <br /> The interceptor sewer as designed calls for an IS" 0 PVC sewer in a 30" 0 steel casing <br /> . SUMYING where it crosses the interstate. The capacity of the interceptor at this location is <br /> approximately 1,800 gallons per minute (gpm). The construction cost of the 18" 10 PVC <br /> "?:Fr/c sewer and 30" 0 steel casing for the crossing is estimated at $48,500. <br /> 'RANS?<;iirJ r;OI I have investigated t'NO scenarios for over-sizing the interceptor crossing of Interstate 35W. <br /> These scenarios will be explained below. <br /> SCl"n~rio 1 <br /> The MWCC lift station (L-35) along County Road H has a capacity of approximately 4,400 <br /> gpm. Allowing 2,000 gpm for Mounds View's sewage flow leaves a capacity of <br /> approximately 2,400 available for future redevelopment of the TCAAP property. A 21" 0 <br /> RCP sewer in a 42. {21 steel casing would be necessary to convey 2,400 gpm. The <br /> construction cost of the 21. 0 RCP sewer and 4r {21 steel casing for the crossing is <br /> 1326 Energy Pane Drive estimated at $68,000. <br /> St. Paul, ~ S5 roa . <br /> 612-644-4389 S("~n~rio 1- <br /> Fax: 612-64.:9446 The second scenario would involve sizing the crossing for the ultimate flow from the <br /> TCAAP development. A 27" 0 Rep sewer in a 48. {21 steel casing would be necessary to <br /> 9800 5nelcrd Po~ convey the ultimate flow (4,500 gpm). The construction cost of the 27. {21 Rep sewer and <br /> . Minneapolis, MN 554..41 48. 0 steel casing is estimated at $93,000. <br /> 612- 5.46-0432 <br /> Fall: 612-5,44.6398 <br />