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' ATTAoitM= 8 <br />Pope - Reid Associates Inc. <br />Environmental Engineering <br />245 E. Gth St., Suite 813 . St. Paul, MN 55101 . 6121227r6'S00 <br />1983 June 21 <br />Mr. Gary Dodge <br />3512 Edmund Boulevard <br />Minneapolis, MN 5506 <br />Dear Gary: <br />This letter contains the information that you requested On 1903 June 16 and 20. <br />1 will deal with the %ever upgrading first and then with the information for the <br />Environmental Assessment worksheet. <br />Sewer Uporadiu <br />•s�si <br />The average flow to the city sewer from the CRr should be about 60.000 - 1004000 <br />Gallons per days Assuming eight hours operation per day this is 130 to 200 <br />gallons per minute. For a one percent slope a cast irons carbon steel* <br />vitrified clay or concrete sewer pipe will Dandle the following flows: <br />* 6 inch pipe about 225 gallons per minute <br />i G inch pipe <br />about <br />480 <br />gallons <br />per <br />minute <br />o 10 inch pipe <br />about <br />$S0 <br />gallons <br />per <br />minute <br />Considering that the CBf will require peak flows above 200 gallons per minute in <br />order to drain clarifiers and tanks the present six inch cast iron sewer pipe <br />must be considered inadequate. I recommend an eight or nine inch connection to <br />the adequate nine inch the that connects the manhole to the Duty's University <br />Avenue sewer. 1 have already estimated the cost of a S00 foot helve inch fiald <br />fabricated schedule 30 carbon steel connection for Pramod ilulkarni as SIS.000, <br />not including the trench. This would pA jbably be reasonable for ie 250 foot <br />eight or nine inch connection Including trench. Any of the foul, materials <br />should be suitable. <br />I sahnct cement on the adequacy of the existing six inch water pipe without <br />knOwing the length of the connection and the water pressure maintained by the <br />City in the mains. i will check on this for yout <br />f'RIl <br />