HomeMy WebLinkAboutR-437003C)
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STORMWATER DRAINAGE PLAN NOTES
1. All construction shall be in accordance with King County specifications
2. Datum shall be K.C.A.`• unless otherwise approved by King County Department of Public Works
3. All sedimentation/erosion facilities must be in oneration prior cc clearing and building construction,
and they must be satisfactorily maintained until construction are completed and the potential for
onsite erosion has passed.
w Galvanized steel pipe utilized as detention facilities shall have asphalt treatment #1 or herrer
inside and outside.
5. All disturbed areas shall be seeded or stabilized by other Surface Water Management methods for the
prevention of onsite erosion after the completion of construction.
6. Grass seedink will be done using an approved type hydro -seeder, or as otherwise approved by King
County Department of Public Works. The performance bond will not be released until the grass has
been established, unless otherwise approved by the King County Department of Public Works.
7. All pipe shall be laid on a properly prepared foundation according to Washington State Spec. 7-02.3(1).
This shall include necessary leveling of the trench bottom or the top of the foundation material as
well as placement and compaction of required beddino material to uniform grade so that the enrire
lenth of the pipe will be supported on a uniformly dense unyielding 'base. If the native material
in the bottom of the trench meets the requirements for "Gravel Backfill for Pipe Bedding" the first
lift of pipe bedding may be omitted provided the material in the bottom of the trench is loosened,
regraded ,and compacted to form a dense unyieldin, base.
8. All building downspouts and footing drains shall be connected to the storm drainage systerl, unless
otherwise approved by the Department of Public Works.
9. All drainage structures not on public right-of-ways shall have round, solid locking lids, unless
otherwise approved by the Department of Public Works.
10. Rock for erosion protecton of roadside ditches, where required, shall be of sound quarry rock to a
depth of 1 foot. rock aggregate to be as follows
h" - 2" ---- 10% - 20%
2" - 4" ---- 20% - 40%
4" - 8" ---- 40% - 70%
11. Structures shall not be permitted within 10' of the spring line of any storm drainage pipe(j). or
15' from the top of any channel bank.
12. The storm drainage system shall be constructed according to the approved plans which are on file in
the Department of Public Works Central Records. Any deviation from the approved plans will require
written approval from the proper agency, currently the King County Department of Public Works.
13. A copy of these approved plans must be on the job site whenever construction is in progress
14. Prior to any construction/development activity the King County Department of Public Works Development
Inspection Section must be contacted (Phone No. 255-2531) for a pre- construction meeting.
15. ALL R/D FACILITIES WILL BE INSTALLED AND IN OPERATION PRIOR TO OR IN CONJUNCTION WITH ALL CONSTRUCTION
ACTIVITY UNLESS THAT ACTIVITY EXCEEDS THE CAPACITY AND INTENT CF THE EROSION/ SEDIM$NTATION nnNTIIOL
rACILITIES or UNLESS OTHERIJISE APPROVED BY THE SURFACE WATER MANAGF1fENT DIVISION.
16. All catch Basin grates shall be depressed 0.10 feet below pavement level.
17. Per King County Code 20.50.100 Section D., the person required to construct the facility pursuant
to Section 20.20.050 shall maintain a liability policy in the amount of one hundred thousand dollars
($100,000) per individual, three liur.dred thousand dollars ($300,000) per occurrence and fifty
thousand dollars ($50,000) property damage, which shall name King County as an additional insured,
and which shall protect King County from any liability up to those amounts or any accident, nei•-
ligence, failure of the facility, or any other liability whatsoever, relating to the construction
or maintenance of the facility. Proof of said liability policy shall be provided to the Development
Inspection Section, 155 Monroe Ave. N.E., Renton, WA 98055 (206-255-2531, or Operator assisted.
ZENITH 5050. toll free) prior to setting up a pre- construction meeting, provided, that in the case
of facilities assumed by King County for maintenance pursuant to Section 20.50.110, said liability
policy shall be terminated when said county maintenance responsibility commences.
18. Catch basin grates installed on County right-of-way shall conform to standard drawing No. 39 or No. 44
which includes the stamping "Outfall to stream, Dump no Pollutants" and "Property of King nounry."
19. Open cut road crossings for utility trenches on existing traveled roadway shall be backfilled only
with pea gravel or 5/8 minus crushed road and mechanically compacted. Cuts into the existing
asphalt shall be neat line cut with saw or jackhammer in a continuous line. A temporary cold rrix
patch must be placed immediately after backfill and compaction. A permanent hot mix patch shall be
placed within 30 days and shall be the thickness of the original asphalt or two inches, whirhever
is greater.
20. All metal driveway culverts within County right-of-way must have concrete or masonry headwalls
of acceptable design.
21. UTILITY INSTALLATION PLANS: Plans showing all underground utilities must be provided to the
King County Department of Public Works Development Inspection Section, 155 Monroe Ave. N.F..,
Penton, WA 98055 (206-255-2531, or Operator assisted, toll free number - ZENITH 5050). Plans for
water and sanitary sewers must be provided prior to the pre -construction meeting. Plans ror all
ocher utilities must be provided prior to the installation of road base course materials. Said
plans shall show the location of the measures that will be taken to prevent soil erosio sedi- /
mentation.
22. Construction of dewatering (ground water) system shall be in accordance t e APWA Standarc
Specification, Section 61-3.02.
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FIELD CHANGE APPROVAL El
THIS APPROVAL IS FOR CHANGES ��� J� �✓
SPECIFIED IN FIELD CHANGE NO 7
DATEp,L NLY AND REVISES THE
PLAN APPROVED ON 67,
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ESTREL BLUEPRINT INC
R-437003