HomeMy WebLinkAboutR-387202Surface Water Standard Plan Notes
1. These notes shall appear on projects for the surface water utility.
2. Before any cont uction or development activity occurs, a pre -construction meeting must be held between the City of Renton plan review
section and the applicant.
3. All design and construction shall be in accordance with the Renton Municipal Code (RMC), the latest edition of the Standard Specifications for
Road, Bridge and Municipal Construction prepared by WSDOT and the American Public Works Association (APWA), as amended by the City of
Renton Public Works Department. It shall be the sole responsibility of the applicant and the professional civil engineer to correct any &Tm,
omission or variation from the above requirements found in this plans. all corrections shall be at no additional cost to the City.
4. Approval of this road, grading, parking and drainage plan does not constitute an approval of any other construction (e.g. domestic water
conveyance, sewer conveyance, gas, ekctrical. etc.)The surface wager drainage system shall be constructed according to the approved plans,
which are on file in with the City. Any deviation from the approved plans will require written approval from the City of Renton Public Works
Department, Surface Water Utility Section.
5. A copy of these approved plans must be on the job site whenever construction is in progress.
6. Grading activities (site alteration) are limited to the hours of 7 a.m. to 7 p.m. Monday through Saturday and no work on Sunday is allowed,
unless otherwise approved with a written decision by the City of Renton.
7. It shall be the applkant's1contractor's responsibility to obtain all construction easements necessary before initiating off-site work. Easements
require City review and approval prior to construction.
8. Franchised utilities or other installations that are not shown on these approved dans shall not be constructed unless an approved set of plans
that met all requirements of Chapter 4 of the Surface Water Design Manual are submitted to the City of Renton.
9. Datum shall be N 4 VD 88 unkw otherwise approved by the City of Renton. Reference benchmark and elevations are noted on the plans.
10. Any dewatering system necessary for the con of stormwater facilities must be submitted to the City for review and approval.
11. All utility trenches and roadway subgrade shall be backfilled and compacted to 95 percent density, standard proctor.
12. Open cutting of existing roadways for non -franchised utility or storm drainage work is not allowed unless specifically approved by the City of
Renton and noted on these approved plans. Any open cut shall be restored in accordance with the City of Renton trench restoration standards.
13. All sedimentabon/erosion facilities must be in operation prior to clearing and building construction, and they must be satisfactorily maintained
until construction is completed and the potential for on-site erosion has passed.
14. All retention/detention facilities must be installed and in operation prior to or in conjunction with all construction activity unless otherwise
approved by the Public Works Department, Surface Water Utility Section.
15. All pipe and appurtenances shall be laid on a properly prepared foundation in accordance with the current State of Washington Standard
Spec0cation for Road and Bridge Construction. This shall include necessary leveling of the trench bottom or the top of the foundation
material, as well as piacerrmt and compaction of required bedding material, to uniform grade so that the entire of the pipe will be
supported on a unifiormly dense, unyielding base. All pipe bedding shall be APWA Class "C, with the exception of PVC pipe.
16. Steel pipe shall be aluminized, or galvanized with asphalt treatment #1 or better inside and outside.
17. All drainage structures, such as catch basins and manholes shall have solid locking lids. All drainage structures associated with a permanent
retention/detention facility shall have solid locking lids.
18. Building and other structures shall be placed in accordance with Table 4.1 Easement Widths and Building Setbacks Lines.
19. All catch basin grates shall be depressed 0.10 feet below pavement level.
20. All driveway culverts located within City of Renton right-of-way shall be of sufficient length to provide a minimum 3:1 slope from the edge of
the driveway to the bottom of the ditch. Rock for erosion protection of roadside ditches, where required, shall be of sound quarry rock placed
to a depth of one (1) foot and must meet the following specifications:
a. 4 - 8 inch rock / 40 - 70% passing;
b. 2 - 4 inch rock/ 30 - 40% passing; and
c. less than 2 inch rock/ 10 - 20% passing.
21. All building downspouts and footing drains shall be connected to the storm drainage system, unless approved by the City plan reviewer or
Surface Water Utility Section. An accurately dimensioned, certified as -built drawing of this drainage system will be submitted to the City upon
completes.
22. Drainage outlets (stub -outs) shall be provided for each individual lot, except for those lots approved for infiltration by the City. Stub -outs
shall conform to the following:
a. Each outlet shall be suitably located at the lowest elevation on the lot, so as to service all future roof downspouts and footing drains,
driveways, yard drains, and any other surface or subsurface drains necessary to render the lots suitable for their intended use. Each
outlet shall have free-flowing, positive drainage to an approved stormwater conveyance system or to an approved outfall location.
b. Outlets on each lot shall be located with a five -foot -high, 2" x 4" stake marked "storm" or "drain' . The stub -out shall extend above
surface level, be visible, and be secured to the stake.
c. Pipe material shall conform to underdrain specifications described in Chapter 4 of the Surface Water Design Manual and, if non-metallic,
the pipe shall be placed in a trench with a tracing wire above or other acceptable detection.
d. Private drainage easements are required for drainage systems designed to convey flows through individual lots.
e. The applicant/contractor is responsible for coordinating the locations of all stub- out conveyance lines with respect to other utilities (e.g.
power, gas, telephone, television).
f. All individual stub -outs shall be privately owned and maintained by the lot home owner.
g. Storm drainage pipe systems shall not penetrate building foundations, except for sump pump discharge lines used to drain crawl spaces,
provided the sump pump system includes backflow prevention or a check valve.
23. All disturbed pervious areas (compacted, graded, landscaped, etc.) of the development site must demonstrate one of the following: The
existing duff layer shall be staged and redistributed to maintain the moisture capacity of the sal, OR; Amended soil shall be added to maintain
the moisture capacity.
24. Proof of liability insurance shall be submitted to the City prior to construction permit issuance.
25. Issuance of the building or construction permits by the City of Renton does not relieve the owner of the continuing legal obligation and/or
liability connected with storm surface water disposition. Further, the City of Renton does not accept any obligation for the proper functioning
and maintenance of the system provided during construction.
26. The Contractor shall be responsible for providing adequate safeguard, safety devices, protective equipment, flaggers, and any other needed
actions to protect the life, health, and safety of the public, and to protect property in connection with the performance of work. Any work
within the traveled right-of-way that may interrupt normal traffic flow shall require a traffic control plan approve by the Public Works
Department, Transportation Systems Division. All sections of the WSDOT Standard Specifications 1-07-23 Traffic Control shall apply.
27. Project located within the aquifer protection area (APA) shall comply with Special Requirement #6 of the Surface Water Design Manual and
Aquifer Protection Regulations (RMC 4-3-050).
Erosion Control Notes
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 curing 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. ging the construction period, no disturbance beyond the clearing limits shall be permitted.
The clearing limits shall be maintained by the applrcantlESC 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 1 through March 30 ) or seven days during the dry season (April 1 tough September 30) shall be immediately
stabilized with the approved ESC cover methods (e.g., seeding, mulching, plastic covering, etc.).
9. Wet season seasonal erosion and sediment control requirements apply to all 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 1st through March 30th, 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.
STRUCTURAL NOTES
1. These plans are approved for standard road and drainage improvements only. Plans for structures such as bridges, vaults, and
retaining walls require a separate review and approval by the City prior to construction.
2. Rockeries are considered to be a method of bank stabilization and erosion control. Rockeries shall not be constructed to serve
as retaining walls. All rockeries in City road right-of-way shall be constructed in accordance with City Standards. Rockeries
outside of road right-of-way shall be constructed in accordance with the International Building Code.
EROSION AND SEDIMENT CONTROL RECOMMENDED CONSTRUCTION SEQUENCE
2. Post sign with name and phone number of ESC supervisor (may be consolidated with the required notice of construction sign).
3. Flag or fence clearing limits.
4. Install catch basin protection if required.
5. Grade and install construction entrance(s).
6. Install perimeter protection (silt fence, brush barrier, etc.).
7. Construct sediment ponds and traps.
8. Grade and stabilize construction roads.
9. Construct surface water controls (interceptor- dikes, pipe slope drains, etc.) simultaneously with clearing and grading for project
development.
10. Maintain erosion control measures in accordance with Appendix D of the Surface Water Design Manual and manufacturer's
recommendations.
11. Relocate erosion control measures or install new measures so that as site conditions change the erosion and sediment control
is always in accordance with the City's Erosion and Sediment Control Standards.
12. Cover all areas that will be unworked for more than seven days during the dry season or two days during the wet season
with straw, wood fiber mulch, compost, plastic sheeting or equivalent.
13. Stabilize all areas that reach final grade within seven days.
14. Seed or sod any areas to remain unworked for more than 30 days.
15. Upon completion of the project, all disturbed areas must be stabilized and BMPs removed if appropriate.
CALL DIAL -DIG AT 1-800--424-5555 AT
LEAST 3 BUSINESS DA YS BEFORE DIGGING
IN COMPLIANCE WITH CIN OF RENTON
STANDARDS
BY: V l Date:
I BY:
I BY:
[-14
0 WNER
Date:
Date:
Date:
R-381102
PROJECT NO. B15 002961
PARCEL NO. 723150-1545
SW -17-23-5
JOE BERNASCONI
520 WILLIAMS A VENUE SOUTH
RENTON, WA 98055
CO:R3872o2