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GB-SEAL-SS56
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DRAIN DOWN
FILTER
PRE -FILTER
CARTRIDGE
IA
INLET PIPE SEE
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O3 CONTROL
POINT 1
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VOID AREA
OUTLET PIPE
SEE NOTES O1
CONTROL
POINT 2 (D
BIOFILTRATION SYSTEM TYPE D PLAN
NOT TO SCALE
C/L
OOUTLET PIPI
SEE NOTES
CONTROL
O3 POINT 2
ALTERNATE ORIENTATION
NOT TO SCALE
HATCH (SEE GENERAL
NOTES FOR LOAD RATING)
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LENGTH,
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BIOFILTRATION SYSTEM TYPE D SECTION
NOT TO SCALE
1
06/13/2025
SS
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ADDENDUM #1
0::
12/10/2024
SS
RP
SS
ISSUED FOR BID
No.
DATE
IDSN
ICHK
APP
IREVISION
CONSTRUCTION NOTES
O INLET AND OUTLET PIPE LOCATION VARIES, SEE DRAINAGE PLAN SHEETS.
O2 INTERIOR FEATURES OF BIOFILTRATION TYPE D UNIT ARE PROVIDED BY
MANUFACTURER AND ARE SHOWN FOR REFERENCE ONLY.
O3 STATION/OFFSET CONTROL POINTS FOR BIOFILTRATION TYPE C UNITS ARE TO
THE CORNER OF EACH UNIT AT OUTER FACE OF PRECAST WALL. UNIT
ALIGNMENT IS ORIENTED PARALLEL TO CURB LINE: LOCATIONS ARE
APPROXIMATE, CONTRACTOR TO FIELD VERIFY.
O INLET TO OUTLET ELEVATION DROP VARIES, MINIMUM 6". SEE DRAINAGE
PROFILE SHEETS.
INLET PIPE SEE
NOTES O_
CONTROL
POINT 1 O
BIOFILTRATION SYSTEM TYPE D GENERAL NOTES:
1 1. BIOFILTRATION SYSTEM TYPE D WITHOUT PLANTS SHALL HAVE
SOLID CONCRETE TOP SLAB AND ACCESS HATCHES MEETING
LOADING REQUIREMENTS PER SCHEDULE TABLE BELOW.
2. THE CONTRACTOR IS RESPONSIBLE FOR INLET
PROTECTION/SEDIMENT CONTROL AND CLEANING AROUND EACH
BIOFILTRATION SYSTEM TYPE D UNIT.
3. THE UNIT SHALL BE PLACED ON A COMPACTED SUB -GRADE WITH A
MINIMUM 6-INCH CSTC. COMPACT UNDISTURBED SUB -GRADE
MATERIALS TO 95% OF MAXIMUM DENSITY AT +1 TO 2% OF OPTIMUM
MOISTURE. UNSUITABLE MATERIAL BELOW SUB -GRADE SHALL BE
REPLACED TO THE ENGINEER'S APPROVAL.
4. BIOFILTRATION SYSTEM TYPE D SHALL CONSIST OF PRE -CAST
VAULT WITH BIOFILTRATION MEDIA, OUTLET CHAMBER AND AN
INTERNAL FLOW BYPASS SYSTEM. THE TREATMENT SHALL BE IN
ACCORDANCE WITH DESIGN DATA AND INFORMATION CONTAINED IN
THIS DRAWING AND THE CONTRACT DOCUMENTS. CONTRACTOR TO
CONFIRM TREATMENT SYSTEM MEETS REQUIREMENTS OF THE
PROJECT.
5. BIOFILTRATION SYSTEM TYPE D SHALL HAVE GENERAL USE LEVEL
DESIGNATION (GULD) AND CERTIFICATION FROM THE WASHINGTON
STATE DEPARTMENT OF ECOLOGY FOR BASIC AND METALS
TREATMENT.
6. MANUFACTURER TO PROVIDE ALL MATERIALS UNLESS NOTED
OTHERWISE.
7. FOR FABRICATION DRAWINGS WITH DETAILED STRUCTURE
DIMENSIONS, WEIGHTS, AND ACCESSORIES, CONTACT
MANUFACTURER.
8. CONTRACTOR TO PROVIDE ALL LABOR, EQUIPMENT, MATERIALS AND
INCIDENTALS REQUIRED TO OFFLOAD AND INSTALL THE SYSTEM
AND APPURTENANCES IN ACCORDANCE WITH THIS DRAWING AND
THE MANUFACTURER'S SPECIFICATIONS, UNLESS OTHERWISE
STATES IN MANUFACTURER'S CONTRACT. UNIT MUST BE INSTALLED
ON LEVEL BASE. MANUFACTURER RECOMMENDS A MINIMUM OF 6"
LEVEL ROCK BASE UNLESS SPECIFIED BY THE PROJECT ENGINEER.
HATCH (SEE GENERAL CONTRACTOR IS RESPONSIBLE FOR VERIFYING PROJECT
C/L NOTES FOR LOAD RATING)
ENGINEER'S RECOMMENDED BASE SPECIFICATIONS.
WIDTH,
SEE SCHEDULE
ti
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RIM/FG
OUTLET PIPE
BIOFILTRATION SYSTEM TYPE D SECTION
NOT TO SCALE
DESIGNED BY:
S. SRIDHARAN
DRAWN BY:
H. ONG
CHECKED BY:
R. PARISH
APPROVED BY:
S. SRIDHARAN
SUBMITTED BY:
6-9-2025 R. PARGAS
9. CONTRACTOR TO SUPPLY AND INSTALL ALL EXTERNAL CONNECTING
PIPES. ALL PIPES MUST BE FLUSH WITH INSIDE SURFACE OF
CONCRETE (PIPES CANNOT INTRUDE BEYOND FLUSH). INVERT OF
OUTFLOW PIPE MUST BE FLUSH WITH DISCHARGE CHAMBER FLOOR.
ALL PIPES SHALL BE SEALED WATER TIGHT PER MANUFACTURER'S
STANDARD CONNECTION DETAILS. CONTRACTOR RESPONSIBLE FOR
CONTACTING MANUFACTURER FOR ACTIVATION OF UNIT.
MANUFACTURER'S WARRANTY IS VOID WITHOUT PROPER
ACTIVATION BY A MANUFACTURER REPRESENTATIVE.
1
BIOFILTRATION SYSTEM TYPE D SCHEDULE
ID #
TREATMENT
OFFLINE 15 MIN
PEAK FLOW
STATION/OFFSET
VAULT
INLET
OUTLET
LOADING
REQUIREMENT
WQ FLOW RATE
(CFS)
RATE (CFS)
DIMENSIONS
ORIENTATION
ORIENTATION
REQUIREMENTS
CONTROL POINT 1
CONTROL POINT 2
RAINIER 207+87.20,
RAINIER 207+87.40,
MWS-66
METALS BASIC
0.025
0.089
4.30 RT
9.30 RT
41 x 4'W
C
C
HS-20
STC 610+84.18,
STC 610+84.18,
MWS-67
METALS BASIC
0.477
1.864
21.78 RT
30.78 RT
81 x 24'W
C
C
HS 20
STC 610+93.14,
STC 610+84.14,
MWS-68
METALS BASIC
0.463
1.82
42.50 RT
28.50 RT
81 x 24'W
A
B
HS 20
RAILAKDW
RAILAKDW
MWS-69
METALS BASIC
0.212
1.039
720+46.47, 45.78 LT
720+37.47, 45.78 LT
81 x 8'W
B
A
HS 30
SCALE:
Q J NTS
- Q FILENAME:
.5r.RIDE 1cf) col I
w S1-BT120-CDD501-507
BRT General Engineering Consultont z " SOUNDTRANSIT CONTRACT No.:
RTA/CN 0205-24
DATE: REVIEWED BY: DATE: DATE:
12/10/2024 J. ALTCHECH 12/10/2024 12/10/2024
STRIDE BUS RAPID TRANSIT
SOUTH RENTON TRANSIT CENTER
BT105
CIVIL
DRAINAGE DETAILS
`J "1R-4332159 �
DEVELOPMENT ENGINEERING
IL
msippo 11 /25/2025
DRAWING No.:
BT120-CDD504
FACILITY ID:
BT120
SHEET No.: REV:
183 1
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