3.0. SR 04-12-1993
ITEM 3.
TO: MAYOR & CITY COUNCIL
PARK & RECREATION CO
SUBJECT: WELL #4 AND BACKWASH POND
FROM: PAT KLAERS, CITY
DATE: APRIL 8, 1993
The City Council briefly reviewed this issue at its 4/5/93
meeting as did the Park and Recreation Commission at its 4/7/93
meeting. Based on the limited information that was available,
it was the general opinion of both groups that the Orono Park
area, on the west side of Gary Street and south of the
apartments, is not an appropriate location for a water
department backwash drainage pond.
Utilities Superintendent, Bill Birrenkott, has expressed
concern that not all of the information related to this
proposal was presented. Bill requested that he be able to
present information on this issue to the City Council and the
Park & Rec Commission. Accordingly, Bill is on this agenda to
present information related to the backwash pond.
.
Attached for your review is a memo from the City Engineer on
the proposed backwash pond, some handwritten notes regarding
the proposed backwash pond, and a few sketches showing the
general location and size of the pond. In general terms, the
backwash pond will be located in the vicinity of the drainfield
of the apartment complex. (The apartment complex is required
to hook up to sewer and water this summer.)
There is no doubt that a backwash pond is more economical in
the short run. However, a holding tank within the building may
have some long term benefits. The holding tank may facilitate
recycling the water in the future. Recycling of the water
cannot take place now because the water system is not
chlorinated.
At the old City Hall site (creamery site) the water is "flushed"
directly into the sanitary sewer system. At this new well
site, if a pond is constructed, no water would flow into the
sanitary sewer system. If the water was retained in a concrete
tank in the building, then the water would be discharged during
off peak sewer periods into the sewer system. No charges will
be made to the Utilities for the discharge into the sewer
system, but it will be noted in our City Audit as a
contribution to the Water Utility.
.
The biggest issue with this backwash pond, is the question of
whether or not this fenced-in pond area is appropriate for a
park...either the Orono area-wide park or a neighborhood park.
By this I mean we are proposing a well and tower some time in
720 Dodge Avenue N.W., Elk River, Minnesota 55330 (612) 441-7420
.
.
.
the next few years in the Hillside Addition. Is this location
also appropriate for a backwash pond or would a tank be
required in this residential neighborhood? It seems that a
pond would further erode the area available for park activities
in either park vicinity. No plans are finalized for what will
happen in Orono Park, but certainly many options. have been
discussed and some alternative will be implemented as time and
money allows.
My recommendation on this issue remains the same in that a
holding tank be required and that no backwash or discharge pond
be allowed in this park.
_ / } ~ ~ ~ 3 J CONSULTING ENGINEERS
· ~-"'" Maier Stewart & Associates Inc.
April 7, 1993
File: 23S~OOS~20
Mr. Bill Birrenkott
Elk River Municipal Utilities
322 King Street
Elk River, MN 55330
RE: WATER TREATMENT FACILITY
BACKWASH WATER POND
Dear Mr. Birrenkott:
In follow-up to the information we faxed to you today, we have prepared this correspondence
expanding on the issue of a pond for disposal of the backwash water generated from the water
treatment facility.
. Qriginally, the \Vater treatment facility was designed with a concrete basin below the building
which has a volume of 108,000 gallons. This will allow for the complete bachvashing of the
filter, storage of the 'Miter used, and then a metered discharge to the sanitary sewer system.
This design allows for backViashing at any time without overloading the sewer system. The
basin is also large enough so that, once the entire water system is chlorinated, the backwash
water could be reclaimed through the water treatment facility.
Elk River happens to be one of the few locations in the state which has native soils capable of
accepting large volumes of backwash water and percolating them into the ground. The City of
Anob has seven water treatment facilities, six of which utilize ponds to dispose of backwash
water.
Investigating this option, we have determined that a ponding area would require an area
approximately 100 feet by 108 feet. The pond would be eight feet deep but would only fill to
a depth of six feet every time the filter is backwashed. This is a volume of approximately
100,000 gallons, depending on length of backwash.. According to John Norgren of the City of
Anoka, their ponds drain down in about a day. We estinlate Elk River will backwash this filter
1~2 times a week, depending on water usage.
We visited one of Anoka's sites at 5th Avenue and East River Road. The backwash water is
very turbid, having a brownish iron color. Other than normal grass cutting, John indicated their
. maintenance consisted of cleaning the bottom of the pond every 10~12 years.
1959 SLOAN PLACE, SUITE 200, ST. PAUL, MINNESOTA 55117 612-n4-6021
9800 SHELARD PARKWAY, SUITE 102, MINNEAPOLIS, MINNESOTA 55441 612-546-0432 . Equal Opportunity Employer
~.as.lpr
. Mr. Bill Birrenkott
April 7, 1993
Pdge Two
The construction of a pond would reduce the initial construction cost by an estimated 563,000.
This is due to the elimination of the basin below the building. This estimated reduction in cost
assumes that the approximately 0.25 acre of land for the pond has no value. Another cost
savings, which is harder to quantify, is the value of treating at the wastewater treatment plant
approximately 150,000 pllons per week of backwash water. Of course, this would be
eliminated in the future if the backwash water was reclaimed.
As we discussed, from strictly a cost-effective engineering perspective, we believe a pond is the
best alternative. From an initial cost standpoint, it certainly is the least costly alternative.
However, there are other issues involved in this decision such as safety, liability, aesthetics, and
environmental sensitivity. These other issues may outweigh the issue of least costly alternative.
If you have any questions or would like further information on this issue, please call.
Sincerely,
.
MAIER STEWAlU & ASSOCIATES, INe
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cc: Mr. Pat Klaers, City Administrator
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