HomeMy WebLinkAboutRS_Trip_Generation_Memo_180309_v1701 Pike Street, Suite 1200
Seattle, Washington 98101
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rs_trip_generation_memo_171130_v1
November 30, 2017
Susan Hildreth
King County Department of Natural Resources and Parks
Wastewater Treatment Division
King Street Center, Room 503
201 South Jackson Street
Seattle, Washington 98104 148642.630.2
Subject: South Plant Biogas and Heat Systems Improvements Project
Trip Generation Memo
Dear Ms. Hildreth:
In accordance with the City of Renton’s conditional use permit and site plan review ap-
plication requirements for the subject project, Brown and Caldwell developed the follow-
ing evaluation of expected traffic generation. As the new facilities are a replacement
and upgrade of existing biogas utilization and plant heating systems, and not new pro-
cesses, this project is not expected to have any impact on the number of traffic trips dur-
ing operation of the facility. As such, this evaluation is focused solely on construction
traffic trips.
At present, the expected construction dates for the project are from May 2019 to May
2021. Construction is expected to be limited to normal working hours (7:00 am to 5:00
pm) and weekdays (no weekend work or work on legal holidays). Work associated with
the project is confined within the plant boundaries and as a result, there are no signifi-
cant traffic impacts to public right-of-way as part of this project. The construction con-
tractor will be required to develop a detailed traffic control plan as well as an environ-
mental mitigation plan for review and approval by King County prior to commencing the
work on site. These plans will be required to conform with all City of Renton require-
ments and will document the construction contractor’s procedures for minimizing dust,
traffic, erosion, noise, and other impacts resulting from construction traffic.
The total number of construction trips will depend on the final staffing and means and
methods selected by the construction contractor. Generally, the project is expected to
require on average roughly 20 workers travelling to the site each weekday in personal
vehicles. Truck traffic will almost exclusively be for the delivery of materials and equip-
ment to the site and is expected to be on the order of 750 trips over the course of the
two-year construction period. The project currently does not include any removal of ex-
cavation materials from the site and as a result, truck traffic for hauling spoils off-site is
not expected.
Susan Hildreth
King County Department of Natural Resources and Parks
November 30, 2017
Page 2
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Please don’t hesitate to contact me should you require any further information regarding
this topic.
Very truly yours,
Brown and Caldwell
Ian McKelvey, Project Manager
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