09-10-1990 Council Packet - Laserfiche WebLink

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f Bonestroo Rosene Anderlik & Associates Engineers & Architects September 6, 1990 City of Orono Lojk ^6 Crystal Bey, MN 55323 Attn« Ml. John Gerhardson Re: Veil No. 3 O.'ono, NN File No. 13949 Otto G aonettioo PE Booen * PE jowof C Anaertiit, PE M^rxnr) L SofvaU. PE PitnaRj E Tufnff P£ jam« C Otior pE Gie^i g Cook. PE Tho«»Mt E NoyP\ PE ItoOfft G StruncTM. PE SoM«' M EOWI C P A KMn A Go<oor PE Kicnna '* foiwf PE OonM C BuiQJidL PE .(«ftv A Bouroon PE Mare A Manvxt PE tW < PE Mcnae* r Rautmann. PE tooeft a P<pt»tfie PE DavKj O U3UVU. PE thomai Pftffvxi. PE ^fccfar C Lyncn PE jamn a Maiarx]. pe Kennetn P Anaenor PE Mart R floPi PE ■doott C Ruun. AIA E Anguv PE Hotwanj A SaotoitJ PE Daniel i Eogetton. PE Mart A S«i PE Ptukp J Catwe« “E i«na« Maitmn. PE Mare □ VUMv PE Thomai R Anoffwn. A IA Gary F Rytancm. PE Mae* B Jenten. PE L Pnoip Gfavei « PE tent C Ptumaii AiA Agnes M R>r>g. A IC P Jetty O Rwtaen. PE CetiAo Or«v«t PE CFianei a Encuon Leo M Pawersky Manan M Oryx’ V WiU l.r J SS^UO’-rJ CITY tif (tROND w~ ,'S Dear Jonn: This letter is to provide a report on the current status of the construction of Veil No. 3. Based on data from test pumping the well, it appears that the cavity in the JordEux sandstone has not stabilized and the veil in its present condition''vill pump sand each time it is started at rates as low as 500 gpm. Enclosed is a sketch of the well tor discussion purposes. Approximately 350 cu. yds. of sandstone was removed by pressurizing and airlifting. Pressurizing is intended to loosen soft material to allow its removal. Pressurization and boiling cycles are continued until little material is drawn into the cavity. These pressurization cycles were completed on the well prior to installing the test pump. Testing of the well was started at a low rate and increased in steps as the sand content at each rate decreased. The pumpage rate was then reduced to determine the sand free capacity of the well. It was desired to develop well No. 3 at 1000 gpm cmd tested at rates up to 1600 gpm. Generally wells of this type pump sand free at rates of 1200-1400 gpm and are operated at the lover 1000 gpm. However, Well No. 3 when pumped continuously was not sand free until the rate was dropped to 500-600 gpm. Because the permanent pump will be started and stopped in response to pressure in the hydropnematic tank, the test pump was cycled at 500 gpm. This test shoved that the well would pump sand at each start, and therefore cause substantial maintenance problems in the pumping facility and distribution system. 2335 West Highway 36 • St. Paul, Minnesota 55113 • 612-636-4600