HomeMy WebLinkAboutR-42780400
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1. MAY BE CONSTRUCTED BY EXCAVATION OR BY BUILDING A BERM
VIDPUBLIC WORKS SEDIMENT TRAP
DEPARTMENT
-) TEMPORARY POND SPILLWAY
UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS)
STD. PLAN - 211.00
GAZ 9/28/2018 1
Works Administrator DATE
TOE IN
4" x 4"
NOTES:
1. CONDITIONS OF USE
1.1. PLASTIC COVERING MAY BE USED ON DISTURBED AREAS THAT REQUIRE COVER MEASURES FOR LESS THAN 30 DAYS.
1.2. PLASTIC IS PARTICULARLY USEFUL FOR PROTECTING CUT AND FILL SLOPES AND STOCKPILES.
1.3. CLEAR PLASTIC SHEETING MAY BE USED OVER NEWLY -SEEDED AREAS TO CREATE A GREENHOUSE EFFECT AND ENCOURAGE GRASS GROWTH.
CLEAR PLASTIC SHOULD NOT BE USED FOR THIS PURPOSE DURING THE SUMMER MONTHS.
1.4. THIS METHOD SHALL NOT BE USED UPSLOPE OF AREAS THAT MIGHT BE ADVERSELY IMPACTED BY RUNOFF. SUCH AREAS INCLUDE STEEP AND
UNSTABLE SLOPES.
2. DESIGN AND INSTALLATION SPECIFICATIONS
2.1. PLASTIC SHEETING SHOULD HAVE A MINIMUM THICKNESS OF 0.06 MILLIMETERS.
2.2. IF EROSION AT THE TOE OF A SLOPE IS LIKELY, A GRAVEL BERM, RIPRAP, OR OTHER SUITABLE PROTECTION SHALL BE INSTALLED AT THE TOE
OF THE SLOPE IN ORDER TO REDUCE THE VELOCITY OF RUNOFF.
2.3. TIRES, SAND BAGS, OR EQUIVALENT MAY BE USED TO WEIGHT PLASTIC.
2.4. SEAMS BETWEEN SHEETS MUST OVERLAP A MINIMUM OF 12 INCHES AND BE WEIGHTED OR TAPED.
3. MAINTENANCE STANDARDS
3.1. TORN SHEETS MUST BE REPLACED AND OPEN SEAMS REPAIRED.
3.2. IF THE PLASTIC BEGINS TO DETERIORATE DUE TO ULTRAVIOLET RADIATION, IT MUST BE COMPLETELY REMOVED AND REPLACED.
3.3. WHEN THE PLASTIC IS NO LONGER NEEDED. IT SHALL BE COMPLETELY REMOVED.
UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS)
STD. PLAN - 213.30
VID
PUBLIC WORKS PRO DEPARTMENT PLASTIC COVERING GAZ9/28/2018
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Public Works Administrator DATE
PLASTIC COVERING
NOT TO SCALE \ L / NOT TO SCALE
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Call before you dig. 09/10/2024 NO. REVISION BY DATE APPR APPROVED
VERTICAL: NAVD 1988
HORIZONTAL: NAD 1983/1991
DATU M
JOINTS IN FILTER FABRIC SHALL BE SPLICED AT
POSTS. USE STAPLES, WIRE RINGS, OR
EQUIVALENT TO ATTACH FABRIC TO POSTS
6' MAX.
POST SPACING MAY BE INCREASED
TO 8' IF WIRE BACKING IS USED
u r%,r c C.
2"x2" 14 GAUGE WIRE, OR
EQUIVALENT, IF STANDARD
STRENGTH FABRIC USED -
FILTER FABRIC
I
4"x4" MIN. TRENCH
BACKFILL TRENCH WITH NATIVE SOIL
OR 3/4" TO 1-1/2" WASHED GRAVEL
2"x4" WOOD POSTS, STEEL FENCE POSTS, OR EQUIVALENT (TYP.)
1. CONDITIONS OF USE
1.1. SILT FENCE MAY BE USED DOWNSLOPE OF ALL DISTURBED AREAS.
1.2. SILT FENCE IS NOT INTENDED TO TREAT CONCENTRATED FLOWS, NOR IS IT INTENDED TO TREAT SUBSTANTIAL AMOUNTS OF OVERLAND FLOW. ANY CONCENTRATED
FLOW MUST BE CONVEYED THROUGH THE DRAINAGE SYSTEM TO A SEDIMENT TRAP OR POND.
2. DESIGN AND INSTALLATION SPECIFICATIONS
2.1. THE GEOTEXTILE USED MUST MEET THE STANDARD LISTED BELLOW. A COPY OF THE MANUFACTURER'S FABRIC SPECIFICATIONS MUST BE AVAILABLE ON SITE.
AOS (ASTM D4751)
30-100 SIEVE SIZE (0.60-0.15mm) FOR SILT FILM
50-100 SIEVE SIZE (0.30-0.15mm) FOR OTHER FABRICS
WATER PERMITTIVITY (ASTM D4491)
0.02 SEC-' MINIMUM
GRAB TENSILE STRENGTH (ASTM D4632)
180 LBS. MIN. FOR EXTRA STRENGTH FABRIC
100 LBS. MIN. FOR STANDARD STRENGTH FABRIC
GRAB TENSILE ELONGATION (ASTM D4632)
30% MAX. (WOVEN)
ULTRAVIOLET RESISTANCE (ASTM D4355)
70% MIN.
2.2. STANDARD STRENGTH FABRIC REQUIRES WIRE BACKING TO INCREASE THE STRENGTH OF THE FENCE. WIRE BACKING OR CLOSER POST SPACING MAY BE REQUIRED
FOR EXTRA STRENGTH FABRIC IF FIELD PERFORMANCE WARRANTS A STRONGER FENCE.
2.3. WHERE THE FENCE IS INSTALLED, THE SLOPE SHALL NOT BE STEEPER THAN 2HAV
2.4. IF A TYPICAL SILT FENCE IS USED, THE STANDARD 4"X4" TRENCH MAY BE REDUCED AS LONG AS THE BOTTOM 8 INCHES OF THE SILT FENCE FABRIC IS WELL BURIED AND
SECURE IN A TRENCH THAT STABILIZES THE FENCE AND DOES NOT ALLOW WATER TO BYPASS OR UNDERMINE THE SILT FENCE.
2.5. FILTER FABRIC FENCES SHALL BE INSTALLED ALONG CONTOURS WHENEVER POSSIBLE.
3. MAINTENANCE STANDARDS
3.1. ANY DAMAGE SHALL BE REPAIRED IMMEDIATELY.
3.2. IF CONCENTRATED FLOWS ARE EVIDENT UPHILL OF THE FENCE, THEY MUST BE INTERCEPTED AND CONVEYED TO A SEDIMENT TRAP OR POND.
3.3. IT IS IMPORTANT TO CHECK THE UPHILL SIDE OF THE FENCE FOR SIGNS OF THE FENCE CLOGGING AND ACTING AS A BARRIER TO FLOW AND THEN CAUSING
CHANNELIZATION OF FLOWS PARALLEL TO THE FENCE. IF THIS OCCURS, REPLACE THE FENCE OR REMOVE THE TRAPPED SEDIMENT.
3.4. SEDIMENT MUST BE REMOVED WHEN SEDIMENT IS 6 INCHES HIGH.
3.5. IF THE FILTER FABRIC (GEOTEXTILE) HAS DETERIORATED DUE TO ULTRAVIOLET BREAKDOWN, IT SHALL BE REPLACED.
UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS)
PUBLIC WORKS
STD. PLAN - 214.00
1)PRO
4 DEPARTMENT SILT FENCE GAZ 9/28/2018
v4x•
Public Works Administrator DATE
SILT FENCE
NOT TO SCALE
AOQ%k
CITY OF
RENTON
Planning/Building/Public Works Dept.
R-427804
IN COMPLIANCE WITH CITY OF RENTON STANDARDS
MAPLE HIGHLANDS
AHBL JOB #2221005.10
TESC NOTES & DETAILS
DATE:
9/6/2024
FIELDBOOK:
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