HomeMy WebLinkAbout6.b. Section 30 Storm Sewer, Project 177 Discussionf
DATE: JANUARY 14, 1988
TO: MAYOR & COUNCILMEMBERS
C/O STEVE JILK
FROM: CITY ENGINEER/PUBLIC WORKS DIRECTOR HEF
RE: ITEMS FOR THE JANUARY 19, 1988 COUNCIL MEETING
OLD BUSINESS
Section 30 Storm Sewer, Project 177 Discussion
At the December 1, 1987 Public Hearing for this Project Council deferred any
decisions until the January 19, 1988 Council meeting. At Councils direction our
Consultant and Staff were to review the alternatives regarding phasing for this
project to see if all phases were necessary at this time.
Our Consultant and Staff have reviewed the phasing that we discussed at the
December 1, 1987 Hearing, that being Phase I including Subdrainage Areas B3 and
B4, Phase II being Subdrainage Area C and Phase III being Subdrainage Area Dl and
D2. If the Project was phased, then the cost estimate for the different phases
are as follows:
Subdistrict B (Phase I) 95,500.00
Subdistrict C (Phase II) 121,500.00
Subdistrict D (Phase III) 253,000.00
The proposed assessment rate for these phases are as follows:
Subdistrict B-3 (Phase 1) $0.0892 per square foot
Subdistrict B-4 (Phase 1) $0.0165 per square foot
Subdistrict C (Phase II) $0.0646 per square foot
SubDistrict D (Phase III) $0.075 per square foot
If Council should decide to follow the phasing plan and initiate Phase I at this
time, with subsequent phases at later dates, then Subdistricts C and D will be
responsible for portions of the cost of Phase I improvements because the Phase I
storm sewer segment is the downstream segment and would have to be oversized to
accommodate the future flow proposed from Subdistrict C and D. Attached is a
copy of the cost attributable to each Subdistrict for each Phase. As you can see
from the table the cost for Phase I to oversize the pipe to include SubDistricts
C and D in the future would be $8,625.00 and $43,500.00 respectively.
All the cost estimates are based on 1988 dollars and reflects an economy of
scale. Should this project be phased then the Phase II and III cast estimates
would not be accurate at the time these projects may be built. Also, if the size
of the project is reduced the Phase I cost may increase somewhat because of the
loss of the economy of scale if the entire project was to go at once. However,
Staff does not feel that these costs would be much more than in the range of 10%.
Page 2
Section 30 Storm Sewer, Project 177 Discussion
Because there are three (3) new Councilmembers on the Council from the time this
was originally considered last December, Staff would not have any problem meeting
with the Council in a workshop type atmosphere to inform the new members and
update the old members on this project should the Council so desire. Our
Consultant and myself will be at the January 19, 1988 meeting to provide a brief
presentation.
City of Rosemount
Public Works
Dept
01 -Dec -87
Project #176 -
Hawkins Pond
Preliminary Assessment Rate Table
Area
Subdistrict
------------------------------------------------
(sq.ft.)
Rate
Amount
B-1
522,720
$0.0163
$8,502
B-2
8,189,280
$0.0163
$133,195
B-3
719,968
$0.0163
$11,710"
B-4
450,176
$0.0163
$7,322
C
1,411,499
$0.0163
$22,957
D
2,540,135
40.0163
$41,314
Totals
13,833,778
0225,000
Project #177
-Section 30 Storm Sewer Improvements
Preliminary
Assessment Rate
Table
Costs
Costs
Costs
Subdistrict
--------------------------------------------------------------------------------------------
Area(sq.ft.)
Phase I
Rate
Phase II
Rate
Phase III Rate
B-3
719,968
$64,200
$0.0892
$64,200
$0.0892
$64,200 $0.0892
B-4
450,176
$7,425
00.0165
$7,425
$0.0165
$7,425 $0.0165
C
1,411,499
$8,625
40.0061
$91,125
$0.0646
$91,125 $0.0646
D
2,540,135
$43,500
40.0171
$43,500
00.0171
$189,750 40.0747
Totals
5,121,778
$123,750
$0.0242
$206,250
$0.0403
$352,500 $0.0688
Note: Amount
assessed is total project
costs less
25% City share.