Agenda - Council - 03/26/1996 - Laserfiche WebLink

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Bonestroo Rosene Andertik & Associates Engineers & Architects March 22, 1996 Mr. Steve Jankowski City of Ramsey 15153 Nowthen Blvd. NW Ramsey, MN 55303 Re: Well No. l Improvements Our File No. 438WS Dear Steve: 9OneStr00. Ro.ecnc. Anderlik and ASSOCI.rrek I.nC, /J an Affirmprlve Action /Eoual opporrUAlty Employer Prrn<ipe/.•.: Otto G 60neStroo, P.E. - Joreph C: Anderlik. PE. - Marvin 1 Sorvald, P.E. - R ='Chard E. Turner, PE. - Glenn R. Cook. PF. - Tt MAr E Noyes, P.E. - Robert G. Schunicht. P.E. Jerry A. P,ouroon. P.E. - Robcrt W. koscnr, RE and Sus,n M.>:eerbn, C PA.. Senior COnWtanls Asrncipte Prineip,1wHOWar6 A. Sanford, PE - Keith A. Gordon, PP. - Robert R P(crrerle, P.F. - Richord W Foster, P.E. - havjd O. Lo%kota. P.E. - Roberr C. RuSSek, AJ.A, - Ma; k A. HOnSon, P.C. Michael t, Rautmenn, P.t, - Tea K.Firlrt Pb, orficpc, -St, Paul and Rochester. MN - Mcquon, Wl 4GG' J9Dh The City's water demand has boon rapidly increasing due to development. The City has difficulty meeting maximum demands even with supplemental supply from the Anoka system. Well No. 1 was tested by Mr. Mark Boos and E.1`i. Renner & Sons, to determine if a higher pumping rate could be sustained. The well was tested at 650 gpm, 800 gpm and 900 gpm and it was concluded that the pumpage rate could be safely increased to 900 gpm. A review of the original test pump data indicates little time was spent pumping the aquifer to develop a high production well. A substantial amount of sand was observed at 1000 gpm in contrast to the 25 grains observed in the February 1996 test. Normal use over the last 10 years has further developed the aquifer, allowing a higher withdrawal rate. Well No. 2 has been a problem for many years due to pumping of sand and recently sand concentrations have been increasing. The original driller has indicated it may not be possible to increase capacity of well No. 2 due to the quality of the formation at this location. Well No. 2 should be evaluated in the future and redeveloped or abandoned. The Well No. 1 capacity would be increased by removing the existing 40 hp submersible pump and installing a 75 hp vertical turbine pump. .A, concrete pump base would be constructed with casing vents. The present 6 inch discharge piping can be used; however, the water velocity is high. Replacing this line with 8 inch piping should be included in a future budget, We would recommend that a variable speed drive ('V'FD) be installed to operate the new well pump. The VFD would minimize sand as the aquifer is not surged during starting and stopping of the pump, minimize water hammer, allow matching of supply to demand and minimize electrical energy costs. �y 2335 West Highway 36 ■ St. Paul, MN 55113-3898 ■ 612 - 636-4600