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ATTACHMM Pope w Reid associates Inc. Environmental Engineering 245 E. 6th St., Suite 613 9 St. Paul, MN 55101 •612/227165M 1983 June 21 Mr. Gary Dodge 3512 Edmund Boulevard Minneapolis, MN 55406 Dear Gary: This letter contains the information that you requested on 1983 June 16 and 20. I will deal with the sewer upgrading first and then with the information for the Environmental Assessment worksheet. Sewer Upgrading Th zverage flow to the city sewer from the CRF should be about 60,000 - 100,000 gallons per day. Assuming eight hours operation per day this is 130 to 200 gallons per minute. For a one percent slope a cast iron, carbon steel, vitrified clay or concrete sewer pipe will handle the following flows: ® 6 inch pipe about 225 gallons per minute a 6 inch pipe about 480 gallons per minute • 10 inch pipe about 850 gallons per minute Considering that the CRF will require peak flows above 200 gallons per minute in order to drain clarifiers and tanks the present six inch cast iron sewer pipe must be considered inadequate. I recommend aivi eight or nine inch con CC.on.-jo the adequate nine inch tile that connects the manhole to the City Is n�"fth!*d ver Avenue sewer. I have already estimated the cost of a 500 foot twelve 'fabricated schedule 30 carbon steel connection for Pramod Kulkarni as S15,000, not including the trench. This would probably be reasonable for a 250 foot eight or nine inch connection including trench. Any of the four materials should be suitable. I cannot connent on the adequacy of the existiig six inch water pipe without knowing the length 'of the connection and the water pressure maintained by the City in the mains. I will check on this for you. ,