HomeMy WebLinkAboutContract CITY )F RENTON
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Kathy Keolker,Mayor Gregg Zimmerman P.E.,Administrator
April 3, 2007
RECEIVED EC I
Mr. Russell Millard
Property Manager JUN 0 1 2007
Leisure Estates Manufactured Housing Community
201 Union Avenue SE CITY OF RENTON
Renton,WA 98059 PUBLIC WORKS ADMIN
SUBJECT: LETTER OF UNDERSTANDING—RESOLUTION OF DRAINAGE
PROBLEMS BETWEEN HERITAGE PARK AND LEISURE ESTATES
Dear Mr. Millard:
This letter documents the City of Renton's findings regarding a drainage problem that has
occurred between Renton's Heritage Park and Leisure Estates. The letter also proposes an
agreement between you and the City of Renton regarding a means of resolving this problem. If
you agree to the provisions of this proposal,please execute and return this agreement to the
undersigned. We will then move forward with corrective actions.
Background: The City of Renton's Heritage Park and the Leisure Estates Manufactured
Housing Community share a common border near the southwest corner of the City Park. A
natural depression and drainage way exists between the two adjacent properties that conveys
runoff water from rain events from the Heritage Park property to the Leisure Estates property.
There are two Leisure Estates manufactured housing units on the east side of Cedar Drive that are
in the location of this natural drainage course. At some time in the past an unknown party
installed without City permit a rough inlet structure and plastic pipe from the Heritage Park
property on the east side of the fence that separates Leisure Estates from Heritage Park. This pipe
is partially buried, and conveys drainage from Heritage Park between the subject housing units,
where it daylights adjacent to Cedar Drive. The purpose of the pipe is to convey drainage along
the natural drainage course from Heritage Park to Cedar Drive, where it flows across the street
and enters an existing catch basin. This catch basin and piping conveys the flow through the
Leisure Estates private drainage system,which consists of a series of drainage swales and
culverts. The flow is carried to a drainage channel west of Leisure Estates. This drainage
channel carries flow to Maplewood Creek.
The City of Renton is in the process of developing Heritage Park into a recreational facility. This
project involves some grading work and removal of trees, and installation of walking paths.
Statement of Issue: The Puget Sound region experienced the rainiest November on record in
November 2006. This included a storm event very close to the 100-year storm event(storm
expected to happen once every hundred years) in magnitude of rainfall. As a result of this record
rainfall, localized flooding occurred in many places in the Puget Sound Region and in Renton.
Proposal: Although the City believes that it shares no fault in the flooding that was experienced
at Leisure Estates,we are of the opinion that it would be to our common benefit to work to
resolve the problem and to forestall claims or litigation now or in the future. Therefore the City
wishes to make the following proposal:
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1055 South Grady Way-Renton,Washington 98057 RENTON
AHEAD OF THE CURVE
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May 18, 2007 ti,r, rwp
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1) As part of the Heritage Park project, and at no cost to Leisure Estates,the City will install
an engineered drainage conveyance system designed for the 100-year storm event
between Heritage Park and Leisure Estates. This system will consist of an inlet, and a
system of culverts and drain pipes and/or swales that will carry runoff from Heritage Park
to a suitable portion of the Leisure Estates private drainage system. The installation will
be mutually acceptable to Renton and the Leisure Estates Management. Leisure Estates
Management will provide needed temporary construction easements or right of entry
documentation for Renton to install the improvements within Leisure Estates property.
The duration of the right of entry will not be more than six(6)months.
2) Leisure Estates Management will accept maintenance responsibilities for the new
drainage system located on Leisure Estates property upon its completion.
3) During the investigation of the flooding event, it was discovered that catch basins and
drain lines within Leisure Estates are partially filled with silt and need to be cleaned.
Leisure Estates Management commits to cleaning out the system at this time and
implementing a routine maintenance program that will be sufficient to prevent the build
up of silt in the existing drainage system.
4) The costs for constructing this improvement that are borne by Renton will not be passed
along as extra costs to Leisure Estates residents.
5) Leisure Estates Management will not file any claims or lawsuits against the City due to
any damages that may have been experienced due to the subject flooding events.
6) Leisure Estates Management agrees, upon their approval of the new drain system and the
installation of the system by Renton to waive any future drainage claims regarding runoff
from Heritage Park.
Ci of Renton Concurrence Leisure :I a agement Concurrence
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Sincerely,
Gregg Zimmerman, Administrator
Renton Planning/Building/Public Works Dept.
cc: Mayor Kathy Keolker
Jay Covington
Terry Higashiyama
Leslie Betlach
Lys Hornsby
Bonnie Walton
Ron Straka
Rich Marshall
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