3b. Approve plans and specs for Well No. 6 1 i ; 31)
CITY OF _____.
. i„
1 i cuANHAssEN
1 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317
(612) 937-1900 • FAX (612) 937-5739
1
1 MEMORANDUM
if-/1- 9/
ITO: Don Ashworth, City Manager
FROM: Charles Folch, Asst. City Engineer(4( ''
L/,xs_`11.
DATE: April 1, 1991
SUBJ: Approve Plans and Specifications for Construction of Well
.1 No. 6 and Related Watermains and Appurtenances; Authorize
Advertising for Bids, Project No. 91-1
1 On December 10 , 1990 the City Council authorized the preparation
of plans and specifications for the construction of Well and
Pumphouse No. 6 with the interest in having this well brought
Ion-line in the summer of 1991 . At that meeting there were some
questions relating to the quality of water that would be pumped
from a drift well at this location . The concerns primarily
I related to what the iron and manganese content of the water would
be. To acquire the needed information to adequately address this
issue, tests were taken for the iron and manganese content of the
I water from the adjacent Well No. 5, also a drift aquifer. It was
found that approximately 0.20 mg/L of manganese concentration and
0 .02 mg/L of iron were present. By State and Federal standards
these concentrations are considered acceptable from both a health
I and aesthetic standpoint . The iron content is identical to that
of our deep wells . The manganese is higher than our deep wells;
however, its presence is typically not noticed, nor is it
Iharmful.
Bruce A. Liesch Associates, Inc. has prepared plans and
specifications for the construction of the new Well and Pumphouse
1 No. 6. City staff review from the Engineering, Building, Fire
and Utility Departments has recommended some minor revisions to
the preliminary plan which have been incoporated in this final
I plan and specification submittal. The mechanical aspect of the
system is being designed to afford the application of chemical
dosing should the manganese or iron levels reach undesireable
1 levels . Given the current time schedule a late July construction
completion is forecasted.
I
1
Don Ashworth, City Manager
April 1, 1991
Page 2
' A copy of the plans are included in the packets . The
specifications are also available for review upon request. It is
therefore recommended that the plans and specifications prepared
' by Bruce A. Liesch Associates, Inc . be approved for the
construction of Well and Pumphouse No. 6 and that authorization
be given to advertise for bids .
lap
' Attachment: 1. Plans and Specifications .
2 . Location map .
' c: Jerry Boucher, Utility Superintendent
Dave Hempel, Sr. Engineeing Technician
Mark Litfin, Fire Marshal
Steve Kirchman Building Official
' Jim Bullert, Liesch & Associates , Inc.
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