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TW: 395.53
BW: 395.53
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N 581.08
E 900.06
N 581.41
E 897.43
TW: 397.90
BW: 395.73
25.85'
4 INLET
C4.9 PROTECTION
(TYP.)
4.00' MIN. BERM
I-TW: 397.90
BW: 395.80
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PLAN FOR FULL CHAMBER DESIGN
110.78'
GRADE AT BACK OF CURB
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STORM LAYOUT
SCALE: 1" = 10'
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07/21 /2025
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T A C O M A S E A T T L E
S P O K A N E T R I- C I T I E S
2215 North 30th Street, Suite 300 Tacoma, WA 98403
253.383.2422 TEL 253.383.2572 FAX www.ahbl.com WEB
INLET 4
PROTECTION C 9
(TYP. )
N 628.11�/_,
N 609.59 E 991.20
E 964.64
0.73
N 617.90
E 994.47
ITW: 397.90
BW: 396.13
TW: 397.90 /
BW:396.26 /
ZETENTION CELL 1
TOM AREA: 478 SF C4.8
ELEV: 396.90
ELEV:397.90 /
4 /
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GRAPHIC SCALE
0 5 10
1" = 10 FEET
20
PERIMETER STONE
(SEE NOTE 4)
EXCAVATION WALL
(CAN BE SLOPED OR VERTICAL)
/
/
/
TW: 396.66
BW: 396.66
/
TW: 383
BW: 6.42
12" (300 mm
dlf'1TC�.
ADS GEOSYNTHETICS 601T NON -WOVEN GEOTEXTILE ALL
AROUND CLEAN, CRUSHED, ANGULAR STONE IN A & B LAYERS
100 END CAP
SUBGRADE SOILS J
(SEE NOTE 3)
PAVEMENT LAYER (DESIGNED
BY SITE DESIGN ENGINEER)
1 1 i
"TO BOTTOM OF FLEXIBLE PAVEMENT. FOR UNPAVED
INSTALLATIONS WHERE RUTTING FROM VEHICLES MAY OCCUR, 15, 8
INCREASE COVER TO 21" (525 mm). (2.4 m) MAX
(375 mm) MIN'
6" (150 mm) MIN
6"
(150 mm) MIN
33" "THIS CROSS SECTION DETAIL REPRESENTS
(838 mm) MINIMUM REQUIREMENTS FOR INSTALLATION.
PLEASE SEE THE LAYOUT SHEET(S) FOR
PROJECT SPECIFIC REQUIREMENTS.
II I I li-
III— 6" (150 mm) MIN
TT
(SEE NOTE S)
51" (1295 mm) 12" (300 mm) MIN
1. CHAMBERS SHALL MEET THE REQUIREMENTS OF ASTM F2418, "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS".
2. SC-800 CHAMBERS SHALL BE DESIGNED IN ACCORDANCE WITH ASTM F2787 "STANDARD PRACTICE FOR STRUCTURAL DESIGN OF THERMOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS".
3. THE SITE DESIGN ENGINEER IS RESPONSIBLE FOR ASSESSING THE BEARING RESISTANCE (ALLOWABLE BEARING CAPACITY) OF THE SUBGRADE SOILS AND THE DEPTH OF FOUNDATION STONE WITH
CONSIDERATION FOR THE RANGE OF EXPECTED SOIL MOISTURE CONDITIONS. REFERENCE STORMTECH DESIGN MANUAL FOR BEARING CAPACITY GUIDANCE.
4. PERIMETER STONE MUST BE EXTENDED HORIZONTALLY TO THE EXCAVATION WALL FOR BOTH VERTICAL AND SLOPED EXCAVATION WALLS.
5. REQUIREMENTS FOR HANDLING AND INSTALLATION:
• TO MAINTAIN THE WIDTH OF CHAMBERS DURING SHIPPING AND HANDLING, CHAMBERS SHALL HAVE INTEGRAL, INTERLOCKING STACKING LUGS.
• TO ENSURE A SECURE JOINT DURING INSTALLATION AND BACKFILL, THE HEIGHT OF THE CHAMBER JOINT SHALL NOT BE LESS THAN 211
.
• TO ENSURE THE INTEGRITY OF THE ARCH SHAPE DURING INSTALLATION, a) THE ARCH STIFFNESS CONSTANT AS DEFINED IN SECTION 6.2.8 OF ASTM F2418 SHALL BE GREATER THAN OR EQUAL TO 550
LBS/FT/%. AND b) TO RESIST CHAMBER DEFORMATION DURING INSTALLATION AT ELEVATED TEMPERATURES (ABOVE 73° F / 23° C), CHAMBERS SHALL BE PRODUCED FROM REFLECTIVE GOLD OR YELLOW
COLORS.
ACCEPTABLE FILL MATERIALS: STORMTECH SC-800 CHAMBER SYSTEMS
AASHTO MATERIAL
MATERIAL LOCATION
DESCRIPTION
COMPACTION / DENSITY REQUIREMENT
CLASSIFICATIONS
FINAL FILL: FILL MATERIAL FOR LAYER'D' STARTS FROM THE
PREPARE PER SITE DESIGN ENGINEER'S PLANS. PAVED
D
TOP OF THE 'C' LAYER TO THE BOTTOM OF FLEXIBLE
ANY SOIL/ROCK MATERIALS, NATIVE SOILS, OR PER ENGINEER'S PLANS.
N/A
INSTALLATIONS MAY HAVE STRINGENT MATERIAL AND
PAVEMENT OR UNPAVED FINISHED GRADE ABOVE. NOTE THAT
CHECK PLANS FOR PAVEMENT SUBGRADE REQUIREMENTS.
PREPARATION REQUIREMENTS.
PAVEMENT SUBBASE MAY BE PART OF THE'D' LAYER.
AASHTO M145'
BEGIN COMPACTIONS AFTER 12" (300 mm) OF MATERIAL OVER
GRANULAR WELL -GRADED SOIL/AGGREGATE MIXTURES, <35% FINES OR
A-1, A-2-4, A-3
THE CHAMBERS IS REACHED. COMPACT ADDITIONAL LAYERS IN
INITIAL FILL: FILL MATERIAL FOR LAYER'C' STARTS FROM THE
PROCESSED AGGREGATE.
6" (150 mm) MAX LIFTS TO A MIN. 95% PROCTOR DENSITY FOR
C
TOP OF THE EMBEDMENT STONE ('B' LAYER) TO 15" (375 mm)
OR
WELL GRADED MATERIAL AND 95% RELATIVE DENSITY FOR
ABOVE THE TOP OF THE CHAMBER. NOTE THAT PAVEMENT
MOST PAVEMENT SUBBASE MATERIALS CAN BE USED IN LIEU OF THIS
PROCESSED AGGREGATE MATERIALS. ROLLER GROSS
SUBBASE MAY BE A PART OF THE'C' LAYER.
LAYER.
AASHTO M43'
VEHICLE WEIGHT NOT TO EXCEED 12,000 Ibs (53 kN). DYNAMIC
3, 357, 4, 467, 5, 56, 57, 6, 67, 68, 7, 78, 8, 89, 9, 10
FORCE NOT TO EXCEED 20,000 Ibs (89 kN).
EMBEDMENT STONE: FILL SURROUNDING THE CHAMBERS
CLEAN, CRUSHED, ANGULAR STONE
AASHTO M43'
B
FROM THE FOUNDATION STONE (W LAYER) TO THE 'C' LAYER
OR RECYCLED CONCRETE
3, 357, 4, 467, 5, 56, 57
NO COMPACTION REQUIRED.
ABOVE.
A
FOUNDATION STONE: FILL BELOW CHAMBERS FROM THE
CLEAN, CRUSHED, ANGULAR STONE
AASHTO M43'
PLATE COMPACT OR ROLL TO ACHIEVE A FLAT SURFACE.z,s
SUBGRADE UP TO THE FOOT (BOTTOM) OF THE CHAMBER.
OR RECYCLED CONCRETE
3, 357, 4, 467, 5, 56, 57
PLEASE NOTE:
1. THE LISTED AASHTO DESIGNATIONS ARE FOR GRADATIONS ONLY. THE STONE MUST ALSO BE CLEAN, CRUSHED, ANGULAR. FOR EXAMPLE, A SPECIFICATION FOR #4 STONE WOULD STATE: "CLEAN, CRUSHED, ANGULAR NO. 4 (AASHTO M43) STONE".
2. STORMTECH COMPACTION REQUIREMENTS ARE MET FORA' LOCATION MATERIALS WHEN PLACED AND COMPACTED IN 6" (150 mm) (MAX) LIFTS USING TWO FULL COVERAGES WITH A VIBRATORY COMPACTOR.
3. WHERE INFILTRATION SURFACES MAY BE COMPROMISED BY COMPACTION, FOR STANDARD DESIGN LOAD CONDITIONS, A FLAT SURFACE MAY BE ACHIEVED BY RAKING OR DRAGGING WITHOUT COMPACTION EQUIPMENT. FOR SPECIAL LOAD DESIGNS, CONTACT STORMTECH FOR
COMPACTION REQUIREMENTS.
4. ONCE LAYER'C' IS PLACED, ANY SOIL/MATERIAL CAN BE PLACED IN LAYER'D' UP TO THE FINISHED GRADE. MOST PAVEMENT SUBBASE SOILS CAN BE USED TO REPLACE THE MATERIAL REQUIREMENTS OF LAYER 'C' OR 'D' AT THE SITE DESIGN ENGINEER'S DISCRETION.
5. WHERE RECYCLED CONCRETE AGGREGATE IS USED IN LAYERS W OR'B' THE MATERIAL SHOULD ALSO MEET THE ACCEPTABILITY CRITERIA OUTLINED IN TECHNICAL NOTE 6.20 "RECYCLED CONCRETE STRUCTURAL BACKFILL".
STORMTECH CHAMBER SYSTEM
NOT TO SCALE
R-433513
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