HomeMy WebLinkAboutCity Council Packet 10-08-2002 SpecialAgenda
City of Plymouth
Study Session
Tuesday, October 8, 2002
5:30 p.m.
Public Safety Training Room
Call to Order
2. Discuss Ives/Jonquil drainage issues
3. Discuss lift station in Autumn Hills
4. Set future study sessions
5. Adjourn
Agenda Number: CZ
DATE: October 3, 2002 for the Special City Council Meeting of October 8, 2002
TO: Dwight D. Johnson, City Manager through
7//Daniel L. Faulkner, P.E., Director of Public Works
FROM: John M. Hagen, P.E., Assistant City Engineer
Ross A. Beckwith, Civil Engineer
SUBJECT: JONQUIL/IVES DRAINAGE SWALE
PROJECT UPDATE
CITY PROJECT NO. 1044
The purpose of this memorandum is to provide the City Council with an update of the
Jonquil/Ives Drainage Swale Project (City Project No. 1044).
BACKGROUND: The Jonquil/Ives drainage swale is located north of Schmidt Lake
Road, south of the Canadian Pacific railroad tracks, between Jonquil and Ives Lanes (see
attached project location map). The drainage ditch at Jonquil/Ives Lanes has been in
need of a properly built drainage way for many years. The existing drainage way
meandered through the drainage easement area around trees, planters, piles of yard waste,
and other debris that had been added over the years.
The City first looked at ways to improve the Jonquil/Ives drainage swale in 1990 when a
consultant was hired to prepare a concept plan and a preliminary report on drainage
improvements to the area. The concept plan would construct a ponding area just north of
the existing 27 -inch pipe outlet (north of Schmidt Lake Road), a 12 -inch pipe to
discharge the ponding area and handle smaller rain events, and an overflow drainage
swale to handle the larger rain events.
Erosion problems were identified at the northern end of the drainage swale in 1990 and in
1992. To address this, City crews placed rock along the north end of the swale on
February 23, 1994 to help minimize further erosion of the side slopes.
In the summer of 1994, the City was made aware of a planter installed within the
drainage easement area at 5115 Ives Lane. The City hired a consultant to perform a
computer modeling of the drainage swale to identify whether the planter posed a drainage
problem. Based on the consultant's analysis, the planter did pose a drainage problem,
and the owner was notified in writing to have the planter removed or modified so that the
NApw\Engineering\PR0JECTS\2000 - 2009\1044\Memos\SpecialCouncilMtgmemo.doc
SUBJECT: JONQUIL/IVES DRAINAGE SWALE
PROJECT UPDATE
CITY PROJECT NO. 1044
Page 2
distance from the planter to the rear property line was a minimum of 15 feet. The planter
was not modified or removed by the owner, and was subsequently removed this summer
by the City's contractor as part of the Jonquil/Ives Drainage Swale project.
In the summer of 2000, a retaining wall that was installed within the drainage easement at
5135 Ives Lane collapsed, renewing the need to have a Jonquil/Ives drainage swale
project. Other factors leading up to this construction project were a 27 -inch storm sewer
apron buried by approximately 5 feet of sediment, long over due ditch cleaning and
maintenance, and flooding of a property along the swale (5120 Jonquil Lane). The
objective of the project was to expose the end of the buried storm sewer apron, remove
the 5 -foot deep area of water ponding adjacent to this apron, and create a relatively flat,
straight channel to carry the water from the apron to the pond at the north end.
Over the past 2 -plus years, City staff have met with the 10 affected property owners
collectively as a group, and numerous times individually or in small group settings to
discuss the various options and alignments. The first meeting, on January 11, 2001, was
attended by Council Member Black, the former Public Works Director, Fred Moore, and
Senior Engineering Technician — Drainage, Darrell Johnson, and all of the affected
property owners with the exception of 5105 Ives Lane. Two options were presented in
general terms including an open swale and a pipe option. The open swale option would
re-establish a defined open channel within the existing drainage easement. The pipe
option that was presented was the one originally prepared by the City's consultant back in
1990. The topic of retaining walls was also discussed, and the City's position was that
City would not be responsible for rebuilding private retaining walls that were built within
the drainage easement.
It was further presented at this January 2001 meeting that the costs associated with the
pipe option would be assessed to the benefiting properties, in this case the 10 adjacent
property owners of the existing open channel. The open swale option would be paid for
by the City as routine maintenance of a drainage area. During the course of the meeting,
the property owners made it clear that they did not support a pipe option solution, and
clearly wanted the City to take care of the problems without assessing the improvements
back to the residents. Since none of the residents in attendance were in favor of paying
for the pipe option, the consensus was to have the City prepare a more defined plan for
the open swale option.
City staff collected field survey data in the summer of 2001, and completed a preliminary
design of an open swale option in late fall of 2001. In December of 2001 and January of
2002, a preliminary plan showing the proposed ditch alignment to be constructed
completely within the existing drainage and utility easement was presented to residents
along the swale. The bottom of the proposed swale had a design slope that it had to
follow in order to connect the apron with the pond. From the bottom of the swale, 2:1
slopes (2 feet horizontal to 1 foot vertical) were designed to minimize impact in
N:\pw\Engineering\PROJECTS\2000 - 2009\1044\Memos\SpecialCouncilMtgmemo.doc
SUBJECT: JONQUIL/IVES DRAINAGE SWALE
PROJECT UPDATE
CITY PROJECT NO. 1044
Page 3
neighboring back yards. The steeper the side slopes of the swale, the more of the back
yards would remain undisturbed; while the gentler the side slopes of the swale, the
further the swale would cut in to the existing backyards. A low to no maintenance slope
would then be established for the homeowners by planting a short growing, native
looking seed mixture along the swale's side slopes.
In order to keep the project within the limits of the drainage easement, the northernmost
100 feet had only one alignment possible. The next task was to connect this alignment to
the storm outlet end with as few bends as possible (bends in a drainage swale will lead to
erosion in those areas over time as water's natural path is a straight line.)
At the December 2001, and January 2002 meetings, the approximate limits of
construction were roughly estimated in the field with the understanding that a more exact
location would be staked in the months to come, with the trees that needed to be removed
marked, and the residents notified prior to any removal of the trees. A preliminary
schedule was also discussed which included tree removal in the winter, and the actual
excavation of the swale occurring once the ground had a chance to dry up (sometime in
late spring or summer).
On February 26, 2002 a letter was sent to the homeowners explaining that trees would be
marked for removal and if there were concerns, to contact the City by Friday, March 8.
One resident (Brad and Virginia Kalin, 511.5 Ives Lane) responded to this letter and a
meeting was set up at his residence. Assistant City Engineer, John Hagen and Civil
Engineer, Ross Beckwith met with Mr. Kalin, and at that time he asked that we do
everything in our power to save the 4 trees outside his picture window. This concern led
to a redesign of the swale alignment, and the centerline of the swale was shifted to the
west in that area as much as possible to save these 4 trees and not kink the swale too
much to introduce an erosion problem. This second design was then brought to a meeting
on March 21, 2002 at the residence of Lorne and Cindy Pederson (5125 Ives Lane),
Council Member Black, Ross Beckwith, John Hagen, Virginia Kalin and the Pedersons
were all present. Those present agreed upon this design and a copy of the plan sheets was
given to the Pedersons. These are the same plans that were used in construction of the
drainage swale.
Construction of the drainage swale began August 12, 2002. Once the project was
completed, City staff received letters from the residences at 5115 and 5125 Ives Lane
with concerns about the side slopes of the newly constructed drainage swale. City staff
checked the slopes along the ditch. The current slope at 5115 Ives Lane was constructed
at a 2.5:1 at the north end and a 6:1 at the south end of the lot. This is much more gradual
than the planned 2:1 slope in that area. The increase in elevation of the lot to the north
5125 Ives Lane) keeps the slope at a 2:1 to minimize the disruption of the backyard and
allow enough existing ground for the shed to be relocated.
N.\pw\Engineering\PR0JECTS\2000 - 2009\1044\Memos\SpecialCouncilMtgmemo.doc
SUBJECT: JONQUIL/IVES DRAINAGE SWALE
PROJECT UPDATE
CITY PROJECT NO. 1044
Page 4
If the construction limits were extended out to the limits of the drainage and utility
easement, the side slopes would extend anywhere from 7 to 35 feet further in to the
backyard of 5115 Ives Lane, and 5 to 7 feet further into the backyard of 5125 Ives Lane.
The four trees along the existing slope in the backyard of 5115 Ives Lane (that staff
adjusted the design of the swale to save) would be lost, the side slope of the swale would
begin within a few feet from the back of the house, and the side slopes would only be
improved from 2.5:1 and 6:1 to 3:1 and 7:1. At 5125 Ives Lane, there would be greater
impact to the existing backyard, further reducing the area to place the relocated shed, the
side slope would be brought closer to the root mass of some larger mature trees, and the
side slopes would only be improved from 2:1 to 2.5:1 or 3:1.
Also at the request of the two residents, City staff also revisited the pipe option. Upon
further review of the original 12 -inch pipe option concept, City staff determined that it
would make more sense for the pipe option to include a 27 -inch pipe (connected to the
existing 27 -inch pipe outlet on the south side of the project area, eliminating the need for
a second pond at the existing outlet just north of Schmidt Lake Road), and a smaller
overflow swale to carry the large rain events when the pipe is full as well as the backyard
runoff from adjacent properties. The actual construction limits of the 27 -inch pipe option
on the east side, from 5115 to 5145 Ives Lane, would not have been much different than
those of the recently constructed swale, and in fact would extend further up the back
yards in many instances. As a result, approximately 10 more trees would have to
removed for the 27 -inch pipe option than the current swale option. Some of these trees
are significant in size.
In order for the overflow swale of the 27 -inch pipe option to be low enough to avoid
future water damage to the walkout basement at 5120 Jonquil Lane, the alignment of the
overflow swale would have to be separated from the alignment of the pipe. To
accomplish this separation, the pipe was shifted slightly to the east, and the swale was
shifted slightly to the west. This would have led to a little less final impacts to the back
yards on the Ives Lane side, and greater impacts to the backyards on the Jonquil Lane
side. Figures showing the impacts of the various design options and cross-sections at
critical locations along the project will be presented and discussed at the Special Council
Meeting on October 8, 2002
The estimated costs associated with installing the 27 -inch pipe option now (after the
construction of the open swale) would be an additional $40,000. It should be noted that
prior to any work performed on the project, the cost difference between the swale and the
pipe options was approximately $25,000. The estimated cost of the swale option was
42,890 (actual bid was $41,338), and the estimated cost of the 27 -inch pipe option was
originally $66,940.
Throughout the entire project, City staff has taken into account the residents input in the
design and construction of a drainage swale that has balanced these concerns with
NApw\Engineering\PR0JECTS\2000 - 2009\1044\Memos\SpecialCouncilMtgmemo.doc
SUBJECT: JONQUIL/IVES DRAINAGE SWALE
PROJECT UPDATE
CITY PROJECT NO. 1044
Page 5
engineering guidelines and the competing budgetary needs within the City to solve the
critical drainage problems that have been present in this area for years.
RECOMMENDATIONS AND CONCLUSIONS: Based on the limited benefit, the
additional impacts, and the additional costs associated with the pipe option, City staff
does not recommend the installation of a pipe option at this time.
JAn M. Hagen, P.E.
Assistant City Engineer
attachment: Project Location Map
NApw\Engineering\PROJECTS\2000 - 2009\1044\Memos\SpecialCouncilMtgmemo.doc
c0
S
PROJECT 51 S
AREA
I
130 513 II
5120
12
511
511 510
U
n" 5070
Q 5060
J
Q l W
SCHMIDT
PROJECT LOCATION MAP
MEMO
CITY OF PLYMOUTH
3400 PLYMOUTH BOULEVARD, PLYMOUTH, MN 55447
DATE: October 3, 2002
TO: Laurie Ahrens, Assistant City Manager
FROM: Bob Pemberton, Risk Management Coordinator
SUBJECT: Sewer Backup/Lift Station Incident of July 7, 2002
The LMCIT has agreed to fund the damage claims of Jack MacBean, Mike Jennings,
Gregory Pulles and Jerry Kelley. The parties involved, including Ryland Homes, S. M.
Hentges & Sons and the City of Plymouth agreed to appoint a property adjuster from
GAB Robins to contact the homeowners and reach a reasonable documented settlement
of necessary and provable damages. The adjuster contacted Mike Jennings on September
26, 2002 and I was advised that the balance of the homeowners were contacted on
September 27, 2002.
We have asked Swan Development, and will asked Bonestroo & Associates and Total
Control to join us in the voluntary settlement. All parties agreeing to the settlement will
be named on the joint release. Once the claims are settled, the participating parties will
meet and negotiate their final percentage of participation.
Agenda Number:
TO: Dwight D. Johnson, City Manager
FROM: Laurie Ahrens, Assistant City Manager
SUBJECT: Set Future Study Sessions
DATE: September 27, 2002, for City Council study session of October 8, 2002
ACTION REQUESTED: Review the pending study session topics list and establish future
special meetings if desired. Calendars are attached to assist in scheduling.
The City Council may wish to establish a date for the board and commission interviews. We
are actively soliticiting applications through December 3, so any date after that would be fine.
The terms of office for most boards and commissions run through January 31.
The Council previously scheduled discussion of the Met Council's 2030 Blue Print for
November 19. We have learned that this date will not meet the comment period; therefore,
we recommend deleting this item from the November 19 study session. It will be placed on
the October 22 regular meeting agenda for consideration.
Pending Study Session Topics
at least 3 Council members have approved the following study items on the list)
Discuss 2001 Audit Report — spring 2003 (Tierney, Black, Slavik)
Pond cleaning options and Policy for handling drainage concerns —
spring 2003 (Black, Johnson, Stein)
Street Reconstruction Program — spring 2003 (Black, Harstad,
Johnson)
Land Trusts and related housing issues (Black, Johnson, Stein)
Connection to City sewer and septic systems (Stein, Black, Hewitt)
Other requests for study session topics:
Jake Braking of Trucks (Black, Johnson)
OFFICIAL CITY MEETINGS
October 2002
Sunday I Monday Tuesday Wednesday Thursday Friday Saturday
c
Sep 2002
S M T W T F S 7:00 PM
PLANNING
7:00 PM HUMAN
RIGHTS
1:00 PM -5:00
PM
1 2 3 4 5 6 7 COMMISSION, COMMISSION - PLYMOUTH ON
8 9 10 11 12 13 14 Council Chambers Council Chambers PARADE
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30
6 7 8 9 10 11 12
5:30 PM SPECIALCOUNCIL
MEETING:DISCUSS
7:00 PM
ENVIRONMENTAL
7:00 PM HRA -
Council
IVES/JONQUIL DRAINAGE QUALITY Chambers(this
ISSUES; DISCUSS LIFT
STATION IN AUTUMN COMMITTEE meeting only)
HILLS; SET FUTURE
STUDY SESSIONS, Public
EQC), Bass Lake
Safety Training Room Room
7:00 PM PRAC,
Medicine Lake
DoPM REGULAR
Room (this
meeting only) COUNCIL MEETING,
Council Chambers
13 14 15 16 17 18 19
7:30 PM YOUTH
ADVISORY
COUNCIL, Council
7:00 PM
PLANNING
COMMISSION,
7:00 PM PUBLIC
SAFETYADVISORY
BOARD (PSAB), Police
Dept. LibraryChambers
Council Chambers
COLUMBUS DAY
OBSERVED), Public
Works Division closed
20 21 22 23 24 25 26
7:00 PM 7:30,=,L ALBUSINE55
COUNCIL, Rtlum Halal 7:00 PM 7:00 PM
LEAGUE OF
WOMEN 5: 00 I#1 SPECIAL COUNCIL
MEETING: REVIEW SHINGLE
PLYMOUTH
ADVISORY
LEAGUE OF
WOMEN
VOTERS CITY CREEK AND EUA CREEK
SECONDGENERATION
COMMITTEE ON VOTERS STATE
COUNCIL WATERSHED MGMT PLAN, TRANSIT(PACT)- LEGISLATIVE
CANDIDATE
Public So" Tli*gRo Bass Lake Room CANDIDATES
FORUM, Council FORUM, Council
7-PMREGUARCOUNCILChambers Chambers
MEETING, (:aurcY Clvn6ae
27 28 29 30 31 Nov 2002
DAYLIGHT 7:30 PM S M T W T F S7:00 PM LEAGUE
SAVINGS ENDS - YOUTH OF WOMEN
1 2setdocksback1ADVISORYVOTERS3RD
hour COUNCIL, CONGRESSIONAL 3 4 5 6 7 8 9
Council DISTRICT 10 11 12 13 14 15 16
Chambers
CANDIDATES
FORUM, Council 17 18 19 20 21 22 23
Chambers 24 25 26 27 28 29 30
modified on 9/26/2002
OFFICIAL CITY MEETINGS
November 2002
Sunday Monday I Tuesday I Wednesday Thursday Friday Saturday
Oct 2002 Dec 2002
S M T W T F S S M T W T F S
1 2 3 4 5 1 2 3 4 5 6 7
6 7 8 9 10 11 12 8 9 10 11 12 13 14
13 14 15 16 17 18 19 15 16 17 18 19 20 21
20 21 22 23 24 25 26 22 23 24 25 26 27 28
27 28 29 30 31 29 30 31
3 4 5 6 7 8 9
GENERAL
ELECTION -
Polls open 7 AM
7:00 PM
PLANNING
COMMISSION,
7:00 PM
CHOCOLATE
SAMPLE ,
Plymouth
Close 8 PM Council Chambers
7:00 PM HUMAN
RIGHTS
COMMISSION -
Council Chambers
10 11 12 13 14 15 16
VETERANS5:30
DAY
PM SPECIAL
COUNCIL MEETING:
CONSIDER OPTIONS FOR
7:00 PM
ENVIRONMENTAL
7:00 PM PARK &
REC ADVISORY
OBSERVED), POLICY ON DISPOSAL OF
CITY -OWNED PROPERTY,
QUALITY COMMISSION
City Offices SET FUTURE STUDY COMMITTEE FRAC), Council
Closed
SESSIONS, Public Safety
Training Room
EQC), Bass Lake Chambers
Room
7:00 PM REGULAR
COUNCIL MEETING,
Council Chambers
17 18 19 20 21 22 23
7:OOPMSPECIAL COUNCIL
MEETING -DISCUSS: PUBLIC
SAFETY ADVISORY BOARD
CONTINUANCE;
FIREFIGHTER POLICY;WEED
7:00 PM
PLANNING
COMMISSION,
7:00 PM HOUSINGS
REDEVELOPMENT
AUTHORITY (HRA),
Plymouth Creek Center
MOWING a ASSESSMENT
ORDINANCE; BLUEPRINT Council Chambers this meeting only)
2030; FALLEN TREES POLICY;
SCHEDULE FUTURE STUDY
SESSIONS, council Cl 7:D0 PM PUBLIC
SAFETY ADVISORY
BOARD (PSAB), Police
Dept. Library
24 25 26 27 28 29 30
7:30 PM
YOUTH
7:30 AM LOCAL
BUSINESS
COUNCIL,
HRadisson
7:00 PM
PLYMOUTH
THANKSGIVING
HOLIDAY - City
Chanukkah
begins at Sunset9
ADVISORY ADVISORY Center Offices
COUNCIL,
otel
COMMITTEE ON Closed
Council TRANSIT (PACT) -
Chambers 7:00 PM REGULAR
COUNCIL MEETING,
Bass Lake Room THANKSGIVING
HOLIDAY - City
Council Chambers Center Offices
Closed
modified on 9/26/2002
OFFICIAL CITY MEETINGS
December 2002
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
1 2 3 4 5 6 7
2:00 PM OLD
FASHIONED
7:00 PM TRUTH IN
TAXATION HEARING,
Council Chambers
7:00 PM
PLANNING
7:00 PM HUMAN
RIGHTS
CHRISTMAS - SPECIAL COUNCIL
COMMISSION,
Council Chambers
COMMISSION -
Council Chambers
Plymouth
Historical
MEETING: (IMMEDIATELY
FOLLOWING TRUTH IN
Society Building
TAXATION): FIRE DEPT.
REPORT, CONSIDER
PULL TAB REQUEST, SET
FUTURE STUDY
SESSIONS, Council
Chambers
8 9 10 11 12 13 14
7:00 PM TRUTH IN
TAXATION HEARING
RECONVENED (IF
NEEDED), CouncilQUALITY
7:00 PM
ENVIRONMENTAL
7:00 PM PARK &
REC ADVISORY
COMMISSION
Chambers COMMITTEE PRAC), Council
EQC), Bass Lake Chambers
7:30 PM YOUTH Room
ADVISORY COUNCIL,
Council Chambers
15 16 17 18 19 20 21
7:00 PM 7:00 PM 7:00 PM
REGULAR PLANNING HOUSING &
COUNCIL COMMISSION, EDEVELOPMEN
MEETING, Council Council Chambers AUTHORITY
Chambers HRA), Council
Chambers
7:00 PM PUBLIC
SAFETY ADVISORY
BOARD (PSAB), Police
Dept. Library
22 23 24 25 26 27 28
7:30 PM
YOUTH
7:30 AM LOCAL
BUSINESS
CHRISTMAS
HOLIDAY - City
ADVISORY COUNCIL, Offices closed
COUNCIL, Radisson Hotel
Council
Chambers
29 30 31 Nov 2002 Jan 2003
S M T W T F S S M T W T F S
1 2 1 2 3 4
3 4 5 6 7 8 9 5 6 7 8 9 10 11
10 11 12 13 14 15 16 12 13 14 15 16 17 18
17 18 19 20 21 22 23 19 20 21 22 23 24 25
24 25 26 27 28 29 30 26 27 28 29 30 31
modified on 9/26/2002