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T 36• DIA. ADS N-12 PIPE
CONNECTING WELDED STUB
IE 392.5 CONNECT TO CB WITH WATER TIGHT
O CONNECTION (TYP)
Z GRAVEL BACKFILL FOR DRAINS
1 36" ACCESS 2-65 LF 5' DIAMETER 60° DN. CONTROL OR APPROVED (6" MIN
0 RISER �WITEMION TANK SYSTEM 1 STRUCTURE SURROUNDING PIPE)
WITH MANIFOLD END 6" (U.N.O.) PERFORATED
LLI MIRAFI BRIO40N40N PVC RIGID PIPE (SCHD 40
FILTER FABRIC 00 WRAP ON TOP, OR ASTM D3034 SUN 35)
SIDES AND ENDS, E
OVERLAP 12" ON
2' MIN. SEPARATION TOP. 18" MIN
FACTORY FABRICATED WELDED MANIFOLD END
SECTIONS (EYE). PROVIDE LAYOUT PLAN
SHOWING JOINT LOCATIONS AS PART OF
SUBMITTALS FOR ENGINEER APPROVAL.
DETENTION SYSTEM
6.6 MS
ROUND SOLID COVER
MARKED 'BRAIN' WITH
LOCKING BOLTS.
RIM 400.95
WATER -TIGHT COUPLING
4" DIA.
ORIFICE #3
0.41" DIAMETER
ELEV 396.15
ORIFICE #2
0.Y DIAMETER
ELEV 3WOO
36" PIPE TO DETENTION
TANK MANIFOLD SYSTEM.
IE 392.50
SHEAR GATE PER
DETAIL 2/C6.5
STEPS OR LADDER.
ORIFICE y1
0.23" DIAMETER
ELEV 390.50
60" TYPE 2 CATCH BASIN
`J-60" TYPE 2 GB ITT
3
UNDERDRAIN
DETAIL
PLAN
ROUND STUD LOCKING
LID
6.
NITS
SECTION A
2 % FLOW CONTROL STRUCTURE
C�-O6/ NTS
coterra
ENGINEERING PLLC
321 3rd Ave South, Suite 406
Seattle, Washington 98104
ph 206.596.7115
coterraeng i neeri ng.com
DESIGN W.S. 397.50
PIPE SUPPORT(5):
3° X .090°
12° RISER
r- 8° IE 392.50
36" PIPE TO
DETENTION TANK
o MANIFOLD SYSTEM.
INVERT ELEVATION
N PER PLAN
0
N
NO.
J
PLAN
REVISION
PROVIDE RIP RAP AROUND
6" FREEBOARD EXPOSED CB WALLS TYPE I CATCH BASIN
PLANTING PER IA WITH BEEHIVE GRATE
6'PONDINPUNS
WALL OR SIDE SLOPE (2:1 MAX.) BOTTOM ELEV.
PER GRATING PLANSS PER SHEEP C4.0
AND DETAILS, (ttP) ELEV.RIM DETAILSHR SHEET
O
O O
O
ill
W
k
SUBGRADE, DO NOT
COMPACT. SCARIFY
BIORETENTION
PRIOR TO PLACING SOIL
SOIL MIX
_
MIX.
6" MINI
�
e 8• as
\�
6" MI N.
(TYR)
CB IEN. IE PER PUNS
GRAVEL BACKFILL FOR DRAINS) kmI
PER WSDOT SECTION 9-03.12(4) MIN. (1YP)
UNDERDRAINS PER PUNS. SLOPE
® S=O%
6" UNDERDRAIN 0 S=0%
MIRAFI 140N GEOTEXTILE FABRIC WITH 12. OVERLAP ON TOP
ENTION SOIL SPECIFICATIONS
1. IORETENTION SOIL: CEDAR GROVE BIORENTENTION SOIL OR APPROVED EQUIVALENT
1. BIO
3. COMPOST SHALL MEET THE FOLLOWING REQUIREMENTS:
(APPROVED BY BOTH ENGINEER AND COFW BEFORE PLACEMENT). SOIL SHALL BE 65% TO
-SHALL MEET THE FOLLOWING SPECIFICATIONS FOR GRADING WHEN TESTED PER ASTM D422:
70% GRAVELLEY SAND AND 30% TO 35% COMPOST BY VOLUME. SOIL MAXIMUM CLAY
CONTENT SHALL BE LESS THAN 5%. SOIL MIXTURE SHALL BE UNIFORM, FREE OF
SIEVE SIZE PERCENT PASSING (BY WEIGHT)
STONES, STUMPS, ROOTS OR OTHER EXTRANEOUS OBJECTS LARGER THAN 1°. ORGANIC
%* 100
CONTENT SHALL BE 8-10%.
NO. 4 95-100
NO. 10 75-90
2. GRAVELLY SAND SHALL CONSIST OF GRANULAR MATERIAL, EITHER NATURALLY
NO. 40 25-40
OCCURRING OR PROCESSED. IT SHALL BE ESSENTIALLY FREE FROM VARIOUS TYPES OF
NO. 100 4-10
WOOD WASTE OR OTHER EXTRANEOUS OR OBJECTIONABLE MATERIALS. IT SHALL HAVE
NO. 200 2-5
SUCH CHARACTERISTICS OF SIZE AND SHAPE THAT IT WILL COMPACT AND SHALL MEET
THE FOLLOWING SPECIFICATIONS FOR GRADING WHEN TESTED PER ASTM D422:
- MATERIAL MUST MEET THE DEFINITION FOR TYPE 1 OR 2 FEEDSTOCKS COMPOSTED MATERIALS
PER WAG 173-350-220.
SIEVE SIZE PERCENT PASSING (BY WEIGHT)
- CERTIFIED IN COMPLIANCE WITH COMPOSTING COUNCIL S.T.A. PROGRAM.
%" 100
ORGANIC MATTER CONTENT BETWEEN 45% AND 65% AS DETERMINED BY ASTM D2974,
NO. 4 95-100
- PH BETWEEN 5.5 AND 8.0
NO. 10 75-90
- SOLUBLE SALT CONTENT LESS THAN 6.0 mmhos/cm.
NO. 40 25-40
- MATURITY SHALL BE OVER 80% PER TMECC METHOD 05.05-A.
NO. 100 4-10
- STABILITY SHALL BE 7 OR BELOW PER TMECC METHOD 05.08-8
NO. 200 2-5
- CONTAIN I MINIMUM OF 65% BY VOLUME RECYCLED PLANT WASTE AS DEFINED BY WAG
173-350-100 AS TYPE 1 FEEDSTOCKS, FROM LOCAL RECYCLING PROGRAMS.
-- CARBON/NITROGEN RATIO SHALL BE LESS THAN 25:1
BIORETENTION AREA TYPICAL SECTION
MIRAFI 140N OR
APPROVD EQUIVALENT
11 PER PUNS
UNDISTURBED NATIVE MATERIAL, SCARIFY SIDES
AND BOTTOM PRIOR TO PLACING FABRIC
21
GRAVEL BACKFILL FOR DRAINS
(WSDOT/APWA 9-03.12(4))
GRAVEL BACKFILL FOR DRAINS
-'
13` (TYP)
COMPACT IN 6' LIFTS TO 95% DENSITY
[WSDOT/APWA 9-03.12(4)]
6° PVC SDR 35 PERF. PIPE
W/SOLVENT WELD JOINTS
13" (ttP)
FILTER FABRIC LAYER
FREE -DRAINING BACKFILL-
(LESS THAN 5% LINES BASED
ON MINUS 4 FRACTION.
SEE ENGINEERING REPORT).
FILTER FABRIC
4" PERFORATED FOOTING
DRAIN MIN. SLOPE 0.5%
EMBEDDED IN CLEAN
WASHED GRAVEL BACKFILL
FOR DRAINS CONFORMING
TO WSDOT SPECIFICATION 7
9-30.12(4).6' ON EACH SIDE
AND ON TOP, WRAPPED
WITH A FILTER FABRIC
WITH 12" OVERLAP.
i� FOOTING DRAIN
C6.6 1, 1,
IN COMPLIANCE WITH CITY OF RENTON STANDARDS
DEVELOPMENT ENGINEERING
MSippo 06/03/2020
O PERFORATED INTERCEPTOR DRAIN
C6.6 NIS
1 -2D' "'°"w'�°MI ® CITY OF LA FORTUNA PH III [�U'
Me RENTON17210-17324 127TH STREET, RENTON, WA
DM cxm hDA7UMPA Planning/Building/Public Works Deft.IF I WE RICH CIVIL DETAILS
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