HomeMy WebLinkAbout261.10 (replaced 2020)NOTES:
1.PERMEABLE PAVEMENT THICKNESSES LISTED FOR POROUS ASPHALT INCLUDE WEARING COURSE AND ASPHALT TREATED PERMEABLE BASE
(ATPB) WHEN UTILIZED. PERMEABLE ASPHALT TREATED BASE (PATB) SHALL CONFORM TO THE REQUIREMENTS OF APWA GSP 4-SA2. CHOKER
COURSE REQUIRED WHEN ATPB IS USED.
2.CRUSHED SURFACING CHOKER COURSE (CSCC) SHALL CONFORM TO THE REQUIREMENTS OF APWA GSP 4-04.2(9-03.9(2)).OPT2.
3.AGGREGATE BASE SHALL CONFORM TO THE REQUIREMENTS OF APWA GSP 4-04.2(9-03.9(2)).OPT1. RUNOFF STORAGE REQUIREMENTS MAY
REQUIRE A THICKER AGGREGATE BASE. HYDRAULIC MODELING RESULTS SHOWING THE REQUIRED AGGREGATE BASE THICKNESS FOR
STORMWATER CONTROL MUST BE SUBMITTED.
4.PREPARE AND PROTECT SUBGRADE PER APWA GSP 2-06.3(3) SUBGRADE FOR PERMEABLE PAVEMENTS. COMPACT TO A DEPTH OF 6" TO 90%-92%
OF MAXIMUM DENSITY PER WSDOT 2-03.3(14)D. OVERCOMPACTED SUBGRADE SHALL BE SCARIFIED TO 8" MIN. AND RECOMPACTED.
5.PERMEABLE PAVEMENT SHALL BE DESIGNED WHERE THE SOIL BENEATH THE BMP MEETS A MINIMUM ORGANIC MATTER CONTENT OF 1.0% AND
A MINIMUM CATION EXCHANGE CAPACITY OF 5 MILLIEQUIVALENTS PER 100 GRAMS. A 6 INCH SAND LAYER MUST BE INCLUDED IN THE DESIGN
BENEATH THE PERMEABLE PAVEMENT IF THE SOIL DOES NOT MEET THESE PROPERTIES.
6.PAVEMENT BASE SHALL BE INSTALLED PER APWA GSP 4-04.3(5) SHAPING AND COMPACTION.
PERVIOUS CONCRETE/POROUS ASPHALT
MINIMUM MATERIAL THICKNESS (IN):
A
B
SUBGRADE, SEE NOTE 4
PAVEMENT BASE,
SEE NOTE 6
RESIDENTIAL STREETS AND
ALLEYS PEDESTRIAN
LAYER MATERIAL TYPE*
PERVIOUS
CONCRETE
(IN)
POROUS
ASPHALT
(IN)
PERVIOUS
CONCRETE
(IN)
POROUS
ASPHALT
(IN)
PERMEABLE PAVEMENT, SEE NOTE 1 8 6 5 4
CHOKER COURSE, SEE NOTE 2 0 2 0 2
AGGREGATE BASE, SEE NOTE 3 8 6 6 4
A
B
C
C
GENERAL NOTES:
1.REFER TO WSDOT LOCAL AGENCY GENERAL SPECIAL PROVISIONS (GSPs) DIVISIONS 2-9 APWA GSPs, AND WSDOT STANDARD SPECIFICATIONS.
2.POROUS HMA SHALL CONFORM TO REQUIREMENTS OF APWA GSP 5-04.
3.MINIMUM UTILITY SETBACKS AND PROTECTION MEASURES MUST CONFORM TO CURRENT CITY STANDARDS, STD. PLANS 265.00, 265.10, AND
265.20, AND OTHER UTILITY PROVIDER REQUIREMENTS. COORDINATE WITH CITY ENGINEER IN THE EVENT OF UTILITY CROSSINGS OR
CONFLICTS.
4.PERMEABLE PAVEMENT SHALL BE DESIGNED OR REVIEWED BY A LICENSED ENGINEERING GEOLOGIST OR GEOTECHNICAL ENGINEER. FOR ALL
APPLICATIONS, PAVEMENT DESIGNS MUST BE PREPARED BY AN ENGINEER LICENSED IN WASHINGTON STATE.
5.ACCEPTANCE TESTING FOR SIDEWALKS, PATHS AND VEHICULAR PAVEMENT LESS THAN 2,000 SF SHALL BE AS FOLLOWS: PAVEMENT SHALL BE
PERMEABLE ENOUGH TO ABSORB WATER AT A MINIMUM RATE OF 20 INCHES PER HOUR IMMEDIATELY AFTER SURFACE HAS BEEN WETTED
CONTINUOUSLY FOR AT LEAST 10 MINUTES. APPROVAL WITH 5 GALLON BUCKET TEST, WATER TRUCK, OR ASTM C1701 USING A 12-INCH RING
SEALED AT THE PAVEMENT SURFACE.
6.ACCEPTANCE TESTING FOR ROADWAYS AND PARKING AREAS OF 2,000 SF OR GREATER SHALL HAVE A MINIMUM INFILTRATION RATE OF 100
IN/HR PER ASTM C1701 AND APWA GSP 5-04.3 AND 5-06.3(6).
7.ROADWAYS, DRIVEWAYS, AND PARKING LOTS SUBJECT TO VEHICLE LOADING SHALL MEET STRUCTURAL REQUIREMENTS OF CITY OF RENTON
TRANSPORTATION DEPARTMENT STANDARDS FOR EQUIVALENT NON-PERMEABLE PAVEMENT TYPES.
8.FOR PERMEABLE PAVEMENT INSTALLATIONS ON SLOPES GREATER THAN 5%, CHECK DAMS AREA REQUIRED PER STD. PLAN 261.20.
9.SEE CONSTRUCTION PLANS FOR SPECIFIC PROJECT REQUIREMENTS.
SAND LAYER (IF REQUIRED),
SEE NOTE 5
PERVIOUS CONCRETE/POROUS ASPHALT
12" MIN. ABOVE SEASONAL HIGH
GROUNDWATER OR
HYDRAULICALLY
RESTRICTIVE LAYER
PERMEABLE PAVEMENT MATERIAL
SECTIONS - PERVIOUS CONCRETE AND
POROUS ASPHALT
STD. PLAN - 261.10
PUBLIC WORKS
DEPARTMENT
APPROVED:
DATEGregg Zimmerman
Public Works Administrator
UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS)
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9/28/2018 | 9:45 AM PDT