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DRAINAGE NOTES
1. PROOF Or LIABILITY INSURANCE SHALL BE SUBMITTED TO DDES PRIOR TO THE
CONSTRUCHON OF THE DRAINAGE FACILITIES, PREFERABLY AT THE
PRECONSTNUCTION MEETING.
2. ALL PIPE AND APPURTENANCES SHALL BE LAID ON A PROPERLY PREPARED
FOUNDATION IN ACCORDANCE WITH WSDOT SPECIFICATIONS. THIS SHALL
INCLUDE LEVELING AND COMPACTING THE TRENCH BOTTOM, THE TOP OF THE
FOUNDATION MATERIAL, AND ANY REQUIRED PIPE BEDDING, TO A UNIFORM
GRADE SO THAT THE ENTIRE PIPE IS SUPPORTED BY A UNIFORMLY DENSE
UNYIELDING BASE.
3. STEEL PIPE SHALL BE ALUMINIZED, OR GALVANIZED WITH ASPHALT TREATMENT
#1 OR BETTER INSIDE AND OUTSIDE.
4. ALL DRAINAGE STRUCTURES, SUCH AS CATCH BASINS AND MANHOLES, NOT
LOCATED WITHIN A TRAVELED ROADWAY OR SIDEWALK, SHALL HAVE SOLID
LOCKING LIDS, ALL DRAINAGE STRUCTURES ASSOCIATED WITH A PERMANENT
RETENTION/DETENTION FACILITY SHALL HAVE SOLID LOCKING LIDS.
5. ALL CATCH BASIN GRATES SHALL CONFORM TO KCRS, WHICH INCLUDES THE
STAMPING "OUTFALL TO STREAM, DUMP NO POLLUTANTS' AND "PROPERTY OF
KING COUNTY', EXCEPT THAT PRIVATE DRAINAGE SYSTEMS SHALL NOT HAVE
THE WORDS "PROPERTY OF KING COUNTY'.
6. ALL DRIVEWAY CULVERTS LOCATED WITHIN KING COUNTY 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. CULVERTS SHALL
HAVE BEVELED END SECTIONS TO MATCH THE SIDE SLOPE KCRS.
7. ROCK FOR EROSION PROTECTION OF ROADWAY DITCHES, WHERE REQUIRED,
MUST BE OF SOUND QUARRY ROCK, PLACED TO'A DEPTH OF 1 FOOT, AND
MUST MEET THE FOLLOWING SPECIFICATIONS: 4" -8" 140%-70% PASSING; 2"-
" ,r
4 ROCK/30% 40%0 PASSING; AND 2 ROCK/10%-207PASSING.
INSTALLATION SHALL BE IN ACCORDANCE WITH KCRS.
8. DRAINAGE OUTLETS (STUB -OUTS) SHALL BE PROVIDED FOR EACH INDIVIDUAL
LOT, EXCEPT FOR THOSE LOTS APPROVED FOR INFILTRATION BY KING COUNTY.
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 KCRS AND, IF NON-METALLIC, THE PIPE SHALL CONTAIN WIRE
OR OTHER ACCEPTABLE DETECTION.
D) DRAINAGE EASEMENTS ARE REQUIRED FOR DRAINAGE SYSTEMS DESIGNED
TO CONVEY FLOWS THROUGH INDIVIDUAL LOTS.
E) THE APPLICANT/CONTRACTOR IS RESPONSE, LE FOR COORDINATING THE
LOCATIONS OF ALL STUB -OUT CONVEYANCE LINES WITH RESPECT TO THE
UTILITIES (E G. POWER, GAS, TELEPHONE, 'TELEVISION).
F) ALL INDIVIDUAL STUB --OUTS SHALL BE PRIVATELY OWNED AND MAINTAINED
BY THE LOT HOME OWNER.
9. 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 SOIL, OR; AMENDED SOIL SHALL BE ADDED
TO MAINTAIN THE MOISTURE CAPACITY.
10. SEASONAL CLEARING IS LIMITED BETWEEN OCTOBER 1 AND MARCH 30
INCLUSIVE, UNLESS OTHERWISE APPROVED WITH A WRITTEN DECISION BY THE
REVIEWING AGENCY.
11. IMPROVEMENTS AND/OR BUILDINGS SHALL NOT BE INSTALLED UNTIL DRAINAGE
FACILITIES ARE "IN OPERATION", (KCC 9.04).
12. STORM DRAIN PIPE SHALL MEET THE FOLLOWING REQUIREMENTS:
A) PVC PIPE SHALL CONFORM TO ASTM D 3034-73 SDR 35 FOR 4' THRU
15' DIAMETER PVC PIPE, AND SHALL CONFORM TO ASTM F 679 FOR 18"
THRU 21' DIAMETER PVC PIPE, WITH JOINTS AND GASKETS CONFORMING TO
ASTM D 3212 AND ASTM F 477. PVC PIPE SHALL HAVE SMOOTH INTERIOR.
B) POLYETHYLENE SMOOTH WALL PIPE PER ADVANCED DRAINAGE SYSTEMS
(ADS) N-12 CONSTRUCTED PER THE STANDARD SPECIFICATIONS 7-04.
VARIES fE FRAME AND GRATE
(SEE TABLE OR COVER
AT RIGHT) SIDEWALK OR-7
d LANDSCAPING
PAVING
e
4
a
d
OF
STRUCTURE
ADJUSTMENT SECTION
(LEVELING BRICKS OR
GRADE RINGS OPTIONAL).
A ..
STORM DRAIN
STRUCTURE PER PLAN
NOTE:
CONTRAG TOR TO VERIFY TABULATED DIMENSIONS WITH
SUPPLIER PRIOR TO CONSTRUCTION. IF DIMENSIONS
VARY FROM THOSE GIVEN, CONTRACTOR TO ADJUST
STRUCTURE OFFSETS TO COMPENSATE.
GENERA. NOTES
1. ALL DESIGN AND CONSTRUCTION SHALL BE IN ACCORDANCE WITH PERMIT
CONDITIONS, THE KING COUNTY CODE (KCC), ROAD STANDARDS (KCRS),
WASHINGTON STATE DOT (WSDOT) STANDARD SPECIFICATIONS AND THE CONDITIONS
OF PRELIMINARY APPROVAL. IT SHALL BE THE SOLE RESPONSIBILITY OF THE
APPLICANT AND THE PROFESSIONAL CIVIL ENGINEER TO CORRECT ANY ERROR,
OMISSION, OR VARIATION FROM THE ABOVE REQUIREMENTS FOUND IN THESE PLANS.
ALL CORRECTIONS SHALL BE AT NO ADDITIONAL COST OR LIABILITY TO KING
COUNTY.
2. THE DESIGN ELEMENTS WITHIN THESE PLANS HAVE BEEN REVIEWED ACCORDING TO
THE KING COUNTY DEPARTMENT OF DEVELOPMENT AND ENVIRONMENTAL SERVICES
(DDES) ENGINEERING REVIEW CHECKLIST. SOME ELEMENTS MAY HAVE BEEN OVERFLOW ELEV. TO PROVIDE
OVERLOOKED OR MISSED BY THE DDES PLAN REVIEWER. ANY VARIANCE FROM DETENTION & OIL SEPARATION
ADOPTED STANDARDS IS NOT ALLOWED UNLESS SPECIFICALLY APPROVED BY KING PER PLANS
COUNTY PRIOR TO CONSTRUCTION REMOVABLE Cr DIAMETER ELBOW WITH
WATER TIGHT GASKET. SEE DETAIL ON
3. APPROVAL OF THIS ROAD, GRADING, PARKING AND DRAINAGE PLAN DOES NOT K.C.R.S. DWG 2-027.
CONSTITUTE AN APPROVAL OF ANY OTHER CONSTRUCTION (E.G. DOMESTIC WATER o��ORIFICE DIA.=2.73", I.E.=500.60'
CONVEYANCE, SEWER CONVEYANCE, GAS, ELECTRICAL, ETC.) PIPE SUPPORT(S): 3" X .090"
4. BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY, A PRECONSTRUCTION REMOVABLE 6" DIAMETER ELBOW WITH
MEETING MUST BE HELD BETWEEN THE DDES'S LAND USE INSPECTION SECTION, THE WATER TIGHT GASKET. SEE DETAIL ON
APPLICANT, AND THE APPLICANT'S CONSTRUCTION REPRESENTATIVE. K.C.R.S. DWG 2-027
r ORIFICE DIA.=2.55", I.E.=499.50'
5. A COPY OF THESE APPROVED PLANS MUST BE ON THE JOB SITE WHENEVER PIPE SUPPORT(S): 3" X .090"
CONSTRUCTION IS IN PROGRESS.
-
6. GRADING ACTIVITIES (SITE ALTERATION) ARE LIMITED TO THE HOURS OF 7 A.M. TO 7 21"0 STANDPIPE
P.M. MONDAY THROUGH SATURDAY AND 10 A.M. TO 5 P.M. ON SUNDAY, UNLESS
OTHERWISE APPROVED WITH A WRITTEN DECISION BY THE REVIEWING AGENCY. I
7. IT SHALL BE THE APPLICANT'S/CONTRACTOR'S RESPONSIBILITY TO OBTAIN ALL _
CONSTRUCTION EASEMENTS NECESSARY BEFORE INITIATING OFF -SITE WORK,
EASEMENTS REQUIRE REVIEW AND APPROVAL PRIOR TO CONSTRUCTION.
8. FRANCHISED UTILITIES OR OTHER INSTALLATIONS THAT ARE NOT SHOWN ON THESE
APPROVED PLANS SHALL NOT BE CONSTRUCTED UNLESS AN APPROVED SET OF __ r_11j
PLANS THAT MEET ALL REQUIREMENTS OF KCRS CHAPTER 8 ARE SUBMITTED TO THE
DDES'S LAND USE INSPECTION SECTION THREE DAYS PRIOR TO CONSTRUCTION. INVERT ELEVATION
9. DATUM SHALL BE KCAS UNLESS OTHERWISE APPROVED BY DDES. SEE TABLE BELOW
10, DEWATERING SYSTEM (UNDERDRAIN) CONSTRUCTION SHALL BE WITHIN A PIPE SUPPORT(S): 3" X .090" -
RIGHT-OF-WAY OR APPROPRIATE DRAINAGE EASEMENT, BUT NOT UNDERNEATH THE
ROADWAY SECTION. ALL UNDERDRAIN SYSTEMS MUST BE CONSTRUCTED IN
ACCORDANCE WITH WSDOT STANDARD SPECIFICATIONS.
1' SECTION OF PIPE ATTACHED BY -�
11. ALL UTILITY TRENCHES AND ROADWAY SUBGRADE SHALL BE BACKFILLED AND GASKETED BAND TO ALLOW REMOVAL
COMPACTED TO 95 PERCENT DENSITY, STANDARD PROCTOR.
12. OPEN CUTTING OF EXISTING ROADWAYS FOR NON -FRANCHISED UTILITY OR STORM RESTRICTOR PLATE WITH ORIFICE ----�
WORK IS NOT ALLOWED UNLESS SPECIFICALLY APPROVED BY DDES AND NOTED ON .40RIFICE DIA.=1.55", I.E.=494.25'
THESE APPROVED PLANS. ANY OPEN CUT SHALL BE RESTORED IN ACCORDANCE
WITH KCRS
13. THE CONTRACTOR SHALL BE RESPONSIBLE FOR PROVIDING ADEQUATE SAFEGUARDS,
SAFETY DEVICES, PROTECTIVE EQUIPMENT, FLAGGERS, AND ANY OTHER NEEDED
ACTIONS TO PROTECT THE LIFE, HEALTH, AND SAFETY OF THE PUBLIC, AND TO
V-6" MIN.
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18"
OUTLET PIPE
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3/4" THICK x 4' O.C., 4" MAX. SPACING.
x 7'-10" L.F. VERTICAL BARS CORROSION
RESISTANT, STEEL PARTS GALVANIZED. (25
BARS EVENLY SPACED, SEE NOTE 1)
ROUND SOLID COVER
MARKED "DRAIN" WITH
LOCKING BOLTS. SEE
DWG. NOS. 2-022 &
2-023.
ELEV. = 503.07
- ELEV. _ ,¢01.75
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CLEANOUT GATE: SHEAR
_1 a"
INLET PIPE SMOOTH
GATE. VERTICAL BARS
v
INVERT ELEV.
SEE TABLE BELOW
HANDHOLDS, STEPS OR
LADDER, SEE K.C.R.S.
DWG 2-006. SEE NOTE HOOK CLAMP
8. FRAME & COVER ANCHORED TO
' ELEV. P P
RISER
,vraT2ot✓
Nlews� rvZ n C.B. RIS
fj C,TvT/'e Uv Svc A/ y S
ems.,,, Alt, hl®OK�C� P DI
NaAL' OIC 7i NQ TO SCALE
C.B. NO.
DIA.
INLET PIPE
DIA.
OUTLET PIPE
DIA.
INVERT IN
INVERT OUT
RIM ELEV.
1.55"
ORIFICE EL.
"-
ORIFICE EL.
.73"
ORIFICE EL.
STANDPIPE
OVERFLOW
28
60"
18"
18"
496.25(18")
496.25(18')
504.5
494.25
499.50
500.60
501.75
PROTECT PROPERTY IN CONNECTION WITH THE PERFORMANCE OF WORK COVERED
BY THE CONTRACTOR. ANY WORK WITHIN THE TRAVELED RIGHT-OF-WAY THAT MAY
INTERRUPT NORMAL TRAFFIC FLOW SHALL REQUIRE AT LEAST ONE FLAGGER FOR
EACH LANE OF TRAFFIC AFFECTED. MANUAL ON UNIFORM TRAFFIC CONTROL DEVICES C8
(MUTCD) SHALL APPLY. WORK IN RIGHT-OF-WAY IS NOT AUTHORIZED UNTIL A EMERGENCY OVERFLOW
TRAFFIC CONTROL PLAN IS APPROVED BY KING COUNTY.
STRUCTURAL NOTES
1. THESE PLANS ARE APPROVED FOR STANDARD ROAD AND DRAINAGE IMPROVEMENTS
ONLY. PLANS FOR STRUCTURES SUCH AS 3. BRIDGES, VAULTS, AND RETAINING
WALLS REQUIRE A SEPARATE REVIEW AND APPROVAL BY DDES PRIOR TO
CONSTRUCTION (KCB. 16 04- 16.70, 14.20).
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 COUNTY ROAD RIGHT-OF-WAY SHALL BE
CONSTRUCTED IN ACCORDANCE WITH KCRS. ROCKERIES OUTSIDE OF ROAD
RIGHT-F-WAY SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE INTERNATIONAL
BUILDING CODE.
SIRU %URE
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fr
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(L STRUCTURE
Q STRUCTURE
TO FLOW LINE
TO FLOW LINE
TYPE 1
0.78'
0.22'
TYPE 1
0.46'
N/A
THRU CURB
TYPE 2-4&'0
1.78'
0.61'
TYPE 2-48"0
1.46'
N/A
THRU CURB
TYPE 2-54 0
2.03'
0.86'
TYPE 2-54 0
1.71'
N/A
THRU CURB
TYPE 2-60"0
2.28'
1.1 1,
TYPE 2-60"0
1.96'
N/A
THRU CURB
TYPE 2--72"0
2.78'
1.61,
TYPE 2-72"0
2.46'
N/A
THRU CURB
TYPE 2-84"0
3.28'
2.11'
TYPE 2-840
2.96'
N/A
THRU CURB
TYPE 2-96'0
3.78'
2.61'
TYPE 2-96'0
3.46'
N/A
THRU CURB
CATCH BASIN CURB OFFSET DETAIL
TOP HINGE -
(180' SWING)
FLOW RESTRICTOR/OIL POLLUTION
CONTROL DEVICE
SCALE: 1"=2'
UP
JTER OF
,UCTURE
C.B. #29 TYPE -54"0 OFFSET DETAIL
SCALE: 1" =2'
20'
Imtmt�tlair:try:r:���iiTi�llllllll�:!i!�!i!i!i�
1-1 2 PIPE I 16
12" ROUND SECTION - I
i CONC. CLASS C
i 1 I BOTTOM HINGE 1. FENCE AND GATE SHALL BE CONSTRUCTED Imo►
(180' SWING) NOTES: OF BLACK VINYL COATED MATERIAL.
2. MINIMUM POST LENGTH:
12" ROUND SECTION TYPE 1 8'-8"
CONC. CLASS C 3. A CONTINUOUS TENSIONER WIRE SHALL BE 3'-TYPE 1
PROVIDED ON THE BOTTOM TO PREVENT THE
FENCE FROM LIFTING.
4. PROVIDE "NO TRESPASSING' SIGNS AT 50' INTERVALS ON
THE CHAIN LINK FENCE.
STANDARD PLAN L-3
FENCE AND GATE DETAIL
NOT TO SCALE
TOP OF C.B. GRATE
aCCuw
20" x 24"
10" x 12"
160 S.D.
FROM POND
M
DER
HOOK CLAPS / -ORIFICE #2
(2) PLACE DIA. = 2.55"
EVENLY SACED
SEE DETAI BELOW
ORIFICE #3
DIA. = 2.73" CP..
ORIFICE # 1 pi$
DIA. = 1.55" Gam\ a
PLAN VIEW
NOTES:
1. PIPE SIZES AND SLOPES: PER PLANS.
2. OUTLET CAPACITY: NOT LESS THAN COMBINED INLETS.
3. EXCEPT AS SHOWN OR NOTED, UNITS SHALL BE CONSTRUCTED
IN ACCORDANCE WITH THE REQUIREMENTS FOR CATCH BASIN
TYPE 2, 54" MIN. DIAM.
4. PIPE SUPPORTS AND RESTRICTOR/SEPARATOR SHALL BE OF
SAME MATERIAL, AND BE ANCHORED AT 3' MAX. SPACING BY 5/8"
DIAM. STAINLESS STEEL EXPANSION BOLTS OR EMBEDDED 2" IN
WALL.
5. THE RESTRICTOR/SEPARATOR SHALL BE FAEIRICTED FROM .060"
ALUMINUM, OR .064" ALUMINIZED STEEL, OR .064" GALVANIZED STEEL PIPE;
IN ACCORDANCE WITH AASHTO M 36, M 196, M 197 AND M 274.
GALVANIZED STEEL SHALL HAVE TREATMENT 1.
6. OUTLET SHALL BE CONNECTED TO CULVERT OR SEWER PIPE
WITH A STANDARD COUPLING BAND FOR CORRU13ATED METAL
PIPE, OR GROUTED INTO -THE BELL OF CONCRETE PIPE.
7. THE VERTICAL RISER STEM OF THE RESTICTDR/SEPARATOR SHALL BE
THE SAME DIAM. AS THE HORIZONTAL OUTLET PIPE, WITH AN 8" MIN. DIAM.
8. FRAME AND LADDER OR STEPS OFFSET SO THAT:
i
A. CLEANOUT GATE IS VISIBLE FROM TOP.
B. CLIMB DOWN SPACE IS CLEAR OF RISER AND CLEANOUT GATE.
C. FRAME IS CLEAR OF CURB.
9. IF METAL OUTLET PIPE CONNECTS TO CEMENT CONCRETE
PIPE: OUTLET PIPE TO HAVE SMOOTH O.D. EQUAL TO
CONCRETE PIPE I.D. LESS 1/4".
10. MULTI -ORIFICE ELBOWS MAY BE LOCATED AS SHOWN OR
ALL ON ONE SIDE OF RISER TO ASSURE LADDER CLEARANCE.
11. ORIFICE MUST BE INSPECTED PRIOR TO INSTALLATION
LOCKING [SOME GRATE DETAIL
OLYMPIC FOUNDRY 011 EQUAL
N
R 'ew gineer Completion Dote
S nior En i e Comple iPou
Date
JAM ERS Appr vol Date
DEVELOPMENT NGI�IEEP.
Comments:
�dTa'Y 7
R-404511