HomeMy WebLinkAboutR-393704Erasion Control Notes
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1. These notes shall appear for all projects - site improvements, surface water utility,
wastewater utility, water utility, and transportation plans:
2. Before any construction or development activity occurs, a pre -construction meeting
must be held with the City of Renton, public works design engineer.
3. The Boundaries of the clearing limits and areas of vegetation preservation as
prescribed on the plan(s) shall be clearly flagged by survey tape or fencing in the
field prior to construction in accordance with Appendix D of the Surface Water
Design Manual and observed during construction. During the construction period, no
disturbance beyond the clearing limits shall be permitted. The clearing limits shall be
maintained by the applicanVESC supervisor for the duration of construction.
4. Stabilized construction entrances shall be installed at the beginning of construction
and maintained For the duration of the project. Additional measures, such as
constructed wheel wash systems or wash pads, may be required to ensure that all
paved areas are kept clean and track out to road right of way does not occur for the
duration of the project.
5. All required sedimentation/erosion control facilities must be constructed and in
operation prior to land clearing and/or construction to prevent transportation of
sediment to surface water, drainage systems and adjacent properties. All erosion
and sediment facilities shall be maintained in a satisfactory condition until such time
that clearing and/or construction is complete and potential for on -site erosion has
passed. The implementation, maintenance, replacement and additions to
erosion/sedimentation control systems shall be the responsibility of the permitee.
6. The erosion and sedimentation control systems depicted on this drawing are
intended to be minimum requirements to meet anticipated site conditions. As
construction progresses and unexpected or seasonal conditions dictate, the permitee
shall anticipate that more erosion and sedimentation control facilities will be
necessary to ensure complete siltation control on the proposed site. During the
course of construction, it shall be the obligation and responsibility of the permitee to
address any new conditions that may be created by the activities and to provide
additional facilities, over and above minimum requirements, as may be needed, to
protect adjacent properties and water quality of the receiving drainage system.
7. Approval of this plan is for erosion/sedimentation control only. It does not constitute
an approval of storm drainage design, size nor location of pipes, restrictors,
channels, or retention facilities.
8. Any areas of exposed soils, including roadway embankments, that will not be
disturbed for two days during the wet season (October 1st trough March 301h) or
seven days during the dry season (April 1st tough September 30) shall be
immediately stabilized with the approved ESC cover methods (e.g., seeding,
mulching, plastic covering, etc.).
construction sites clearing between October 1 and March 30 inclusive, unless
otherwise approved by the City through an adjustment process.
10. Cover measures will be applied in conformance with Appendix D of the Surface
Water Design Manual.
11. Any area needing ESC measures, not requiring immediate attention, shall be
addressed within seven (7)days.
12. The ESC facilities on inactive sites shall be inspected and maintained a minimum of
once a month or within 24 hours following a storm event.
13, At no time shall more than one (1) foot of sediment be allowed to accumulate within
a catch basin. All catch basins and conveyance lines shall be cleaned prior to paving.
The cleaning operation shall not flush sediment -laden water into the downstream
system.
14. During the time period of October 1"thrflugh March 3V', all project distributed soil
areas greater, that are to be left un-worked for more than 12 hours, shall be
covered by mulch, sodding or plastic covering.
15. Any permanent retention/detention facility used as a temporary settling basin shall
be modified with the necessary erosion control measures and shall provide adequate
storage capacity. If the permanent facility is to function ultimately as an infiltration
system, the temporary facility must be rough graded so that the bottom and sides
are at least three feet above the final grade of the permanent facility.
16. Prior to the beginning of the wet season (Oct. 1), all disturbed areas shall be
reviewed to 'identify which ones can be seeded in preparation for the winter rains.
Disturbed areas shall be seeded within one week of the beginning of the wet season.
A sketch map of those areas to be seeded and those areas to remain uncovered
shall be submitted to the City of Renton for review.
17. All ESC measures must be removed after construction activity is complete.
SECTION D.5 ESC IMPLEMENTATION REQUIREMENTS
D.5.2 WET SEASON REQUIREMENTS
Any site with exposed soils during the wet season (October I to April 30) shall be subject to the special
provisions below. In addition to the ESC cover measures (see Section D.3.2, p. D-10), these provisions
include covering any newly seeded areas with mulch and identifying and seeding as much disturbed area
as possible prior to September 23 in order to provide grass cover for the wet season. A "wet season ESC
plan" must be submitted and approved by the County before work proceeds or continues.
Wet Season Special Provisions
All of the following provisions for wet season construction are detailed in the referenced sections. These
requirements are listed here for the convenience of the designer and the reviewer.
I. The allowed time that a disturbed area may remain unworked without cover measures is reduced to
two consecutive working days, rather than seven (Section D.3.2).
2. Stockpiles and steep cut and fill slopes are to be protected if unworked for more than 12 hours
(Section D.3.2).
3. Cover materials sufficient to cover all disturbed areas shall be stockpiled on site (Section D.3.2).
4. All areas that are to be unworked during the wet season shall be seeded within one week of the
beginning of the wet season (Section D.3.2.5).
5. Mulch is required to protect all seeded areas (Section D.3.2.1).
6. Fifty linear feet of silt fence (and the necessary stakes) per acre of disturbance must be stockpiled on
site (Section D.3.3.I ).
7. Construction road and parking lot stabilization are required for all sites unless the site is underlain by
coarse -grained soil (Section D.3.4.2).
8. Sediment retention is required unless no offsite discharge is anticipated for the specified design flow
(Section D.3.5).
9. Surface water controls are required unless no offsite discharge is anticipated for the specified design
Dow (Section D.3.6).
10. Phasing and more conservative BMPs must be evaluated for construction activity near surface waters
(Section D.5.3).
11. Any runoff generated by dewatering may be required to discharge to the sanitary sewer (with
appropriate discharge authorization), portable sand filter systems, or holding tanks.
12. The frequency of maintenance review increases from monthly to weekly (Section 13.5.4).
D.5.3 CRITICAL AREAS RESTRICTIONS
Any construction that will result in disturbed areas on or within a stream or associated buffer, a wetland or
associated butTer, or within 50 feet of a lake shall be subject to the special provisions below. These
provisions include, whenever possible, phasing the project so that construction in these areas is limited to
the dry season. The County may require more conservative BMPs, including more stringent cover
requirements, in order to protect surface water quality. Any project proposing work within 50 feet of a
steep slope hazard area shall evaluate the need for diverting runoff that might flow over the top of the
slope.
Critical Areas Special Provisions
Any project that disturbs areas on or within a stream or associated buffer, wetland or associated buffer, or
within 50 feet of a lake has the potential to seriously damage water resources, even if the project is
1/9/2009 2009 Surface Water Design Manual — Appendix D
n_1A
T.E.S.C. NOTES AND DETAILS
FOR
UW MEDICINE - VALLEY MEDICAL CENTER
NORTH GARAGE EXPANSION
RECORD DRA WING
ELECTRIC
SUB -PUMP
4 REWSED PER AS —BUILT COND/T/ONS
3 CP-03
2 CP-02
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Nominal Fiow:
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Min Flow:
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Dimensions:
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Capacity:
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25 kVA GENERATORP
GEENERNM FROMATOR
DISCHARGE
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SEWER
APPROVED FOR CONSTRUCTION
SUBJECT TO ERRORS AND OMISSIONS
BY: DATE:
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SURVEYED:
BCE
SCALE:
VERTICAL: NAVD 1988
83/1
HORIZONTAL: NAD 193/1991
DATUM
CITY OF
R RENTON
Planning/Building/Public Works De t.
P
T.E.S.C. NOTES AND DETAILS
UW MEDICINE - VALLEY MEDICAL CENTER
NORTH GARAGE EXPANSION
400 SOUTH 43rd STREET
RENTON, WASHINGTON 98055
CK
0911JI17
AS
DESIGNED:
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02/24/17
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01/30/17
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ONE INCH
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11/04/16
AS
CHECKED:
AS
AS
FULL SCALE
IF NOT ONE INCH
SCALE ACCORDINGLY
BY
DATE
APPR
APPRAOSVED:
03/13/2019
FIELDBOOK:
PAGE:
DRAWING NO:
SHEET w31 OF: 2,�
R - 393704
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