2002-01-23 CC Packet - Laserfiche WebLink

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BONESTROO ROSENE ANDERLIK 'ii 6516361311 01/18/02 10:33 B :03/05 NO:619' . i\ civil ~ngil1eer ill the prescnce of City Staff insrec!cd Ihe lift stulions. The site visit lasted approximutoly Iwo hOllrs, dlll'ing which time the structural, mechat1icllI, and electrical components were inspected during opeJ1Jlion, Flow tests wen: conducted and inforllwtion was gathered ahO[11 the sladons history, maimemll1ce, und operation, Lift Station No, 1 Description This station is U Ivet-well mounted vacuulll pump system mounted on top of a lour-foot diameter prec<\sl concrete w~1 well. The station is located on the south side of COWlty Rond J 4 nnd wns constructed in 19i7, The original lilt stuli~nlVas sllpplied wilh lW\) V,tCUUfl; pumps rmed ror is gallons per minute ~t 24' tolnl dynumie helld (TDH), Dllllllg the on-site inspection, the pumps werc n.ll! manually to conduct the desired flow test experiment The pumps were flow tested andftre currently pJmping at the following rates. Pump No I = 62 grm, Pump No, 2 = 80 gpm, Putl1ui"g R.,.\i>~qn:.\~..!S:1.~ j.i11 st"tiol1 f\lnlimes have beelll'evicwcd ulld tl1bullHCd il'om Jnmlllry 1997 tl1rough Febrile,,)' 1999 T1;e combil1ed runTimes lor both plllllpS hus :lv~raged appmximillely 3 hOllrs per day througll'.llll this pe,iod. This is not ~n excessive amount of hours per day, The station c[lrrenlly services ~pproxinmely ] S homes during the time period listed above, An additional 10 homes will add flow to this lift station by The Shores development with another 5 homos possib],~ 01!1<:r properties nearby FI<lwJ and rUll times will increase /IS Ihese developments are completed. ~.Jll SUHiofl R.cctJm:nl:ndatiuns A. Equipmcm and Piping The eqll!pl:lent in this lift station has reached the ead of its I1sefullife, Therefore, at a minimul11, it is ['ecommended that the existing equipment be replaced with new submersible pumps, The existing concrete wct well is stl1.lcturally in good concitictJ and can I',main in service as the wet wen. Due to the style of the vacuum pump system, the top cover of thc lilT. station will need to be replaced, We recommend the existing pumps be replaced with new submersible non-clog pumps with A minimum capacity of 100 .!Snllon5 per minute a, 30' IDE. Buried val ves or ne'.v shut orl' vulves inside of n valve v~1u1t should also be cOI1$idered as a possible option for this statio11, Th~ "live vault would be similar to the vault installed at Uft Sl~\til1n No.2. B, El~clricul Equipment The electrical equipm~11t is in very poor condilit1n 'l11d needs to be entirely rephc0d, It is r',c"m111<I~de(i that ,ll1eW lIoove.gl'a.1e electrical wntml panel be r[lrni,hed and installed. Ollr'Jr d"clri';,lI re"0111111e11duliol1s inclllde u new SJI'lice disconnecr, l'0pl:icel11ent of the cxistlllg control system with a subnlersibl<.} !~vel transducer, addition Of~ll()w wmCr lc\.'d l1al, ir.corponll;ion of]ow wilter level float and high wuter noats into bnck-up contr"l, ntrinsic safety barrier and vented conduit for nouts, 'lew alamllight, nnd all new wiring.