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2025 ENCOMPASS DESIGN INC.C AN AFFORDABLE HOUSING DEVELOPMENT:ROCKY MOUNTAIN FLATSBOZEMAN, MONTANA1535 liberty lane
suite 110b
missoula, montana
59808
phone: 406.540.4437
24.115edinc Job #:
SITE PLAN REVIEW: 05/29/2025
REV. 02: SP RESUBMITTAL #2
C6.2
DETAILS
MATERIAL LOCATION DESCRIPTION AASHTO MATERIAL
CLASSIFICATIONS COMPACTION / DENSITY REQUIREMENT
D
FINAL FILL: FILL MATERIAL FOR LAYER 'D' STARTS FROM THE TOP OF THE 'C'
LAYER TO THE BOTTOM OF FLEXIBLE PAVEMENT OR UNPAVED FINISHED
GRADE ABOVE. NOTE THAT PAVEMENT SUBBASE MAY BE PART OF THE 'D'
LAYER
ANY SOIL/ROCK MATERIALS, NATIVE SOILS, OR PER ENGINEER'S PLANS.
CHECK PLANS FOR PAVEMENT SUBGRADE REQUIREMENTS.N/A
PREPARE PER SITE DESIGN ENGINEER'S PLANS. PAVED
INSTALLATIONS MAY HAVE STRINGENT MATERIAL AND
PREPARATION REQUIREMENTS.
C
INITIAL FILL: FILL MATERIAL FOR LAYER 'C' STARTS FROM THE TOP OF THE
EMBEDMENT STONE ('B' LAYER) TO 14" (355 mm) ABOVE THE TOP OF THE
CHAMBER. NOTE THAT PAVEMENT SUBBASE MAY BE A PART OF THE 'C'
LAYER.
GRANULAR WELL-GRADED SOIL/AGGREGATE MIXTURES, <35% FINES OR
PROCESSED AGGREGATE.
MOST PAVEMENT SUBBASE MATERIALS CAN BE USED IN LIEU OF THIS
LAYER.
AASHTO M145¹
A-1, A-2-4, A-3
OR
AASHTO M43¹
3, 357, 4, 467, 5, 56, 57, 6, 67, 68, 7, 78, 8, 89, 9, 10
BEGIN COMPACTIONS AFTER 12" (300 mm) OF MATERIAL OVER
THE CHAMBERS IS REACHED. COMPACT ADDITIONAL LAYERS IN
6" (150 mm) MAX LIFTS TO A MIN. 95% PROCTOR DENSITY FOR
WELL GRADED MATERIAL AND 95% RELATIVE DENSITY FOR
PROCESSED AGGREGATE MATERIALS. ROLLER GROSS
VEHICLE WEIGHT NOT TO EXCEED 12,000 lbs (53 kN). DYNAMIC
FORCE NOT TO EXCEED 20,000 lbs (89 kN).
B EMBEDMENT STONE: FILL SURROUNDING THE CHAMBERS FROM THE
FOUNDATION STONE ('A' LAYER) TO THE 'C' LAYER ABOVE.CLEAN, CRUSHED, ANGULAR STONE AASHTO M43¹
3, 357, 4, 467, 5, 56, 57 NO COMPACTION REQUIRED.
A FOUNDATION STONE: FILL BELOW CHAMBERS FROM THE SUBGRADE UP TO
THE FOOT (BOTTOM) OF THE CHAMBER.CLEAN, CRUSHED, ANGULAR STONE AASHTO M43¹
3, 357, 4, 467, 5, 56, 57 PLATE COMPACT OR ROLL TO ACHIEVE A FLAT SURFACE.2,3
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 FOR 'A' 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.
ACCEPTABLE FILL MATERIALS: STORMTECH SC-160LP CHAMBER SYSTEMS
NOTES:
1.CHAMBERS SHALL MEET THE REQUIREMENTS OF ASTM F2418, "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS".
2.CHAMBERS SHALL BE DESIGNED, TESTED AND ALLOWABLE LOAD CONFIGURATIONS DETERMINED IN ACCORDANCE WITH ASTM F2787, "STANDARD PRACTICE FOR STRUCTURAL DESIGN OF
THERMOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS". LOAD CONFIGURATIONS SHALL INCLUDE: 1) INSTANTANEOUS (<1 MIN) AASHTO DESIGN TRUCK LIVE LOAD ON MINIMUM
COVER 2) MAXIMUM PERMANENT (75-YR) COVER LOAD AND 3) ALLOWABLE COVER WITH PARKED (1-WEEK) AASHTO DESIGN TRUCK.
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.
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 1.5”
·TO ENSURE THE INTEGRITY OF THE ARCH SHAPE DURING INSTALLATION, a) THE ARCH STIFFNESS CONSTANT SHALL BE GREATER THAN OR EQUAL TO 400 LBS/FT/%. THE ASC IS DEFINED IN
SECTION 6.2.8 OF ASTM F2418. 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.
D
C
B
A
6" N12
8" N12
SC-160StormTech
6" N12
8" N12
SC-160StormTech
6" N12
8" N12
SC-160StormTech
6" N12
8" N12
SC-160StormTech
6" N1
8" N12
SC-160StormTech
PAVEMENT LAYER
REFER TO PAVEMENT SECTION DETAIL
SUBGRADE SOILS
(SEE NOTE 3)
PERIMETER STONE
(SEE NOTE 4)
EXCAVATION WALL
(CAN BE SLOPED OR VERTICAL)
SC-160LP
END CAP NO SPACING REQUIRED
BETWEEN CHAMBERS
12"
(300 mm)
14"
(350 mm)
MIN*
10'
(3.0 m)
MAX
6" (150 mm) MIN
12" (300 mm) MIN 25"
(635 mm)
12" (300 mm)
TYP
DEPTH OF BASE STONE TO BE DETERMINED
BY SITE DESIGN ENGINEER 6" (150 mm) MIN
ADS GEOSYNTHETICS 601T NON-WOVEN GEOTEXTILE ALL
AROUND CLEAN, CRUSHED, ANGULAR STONE IN A & B LAYERS
SC-160LP ISOLATOR ROW PLUS DETAIL
NTS
CATCH BASIN
OR
MANHOLE
SC-160LP CHAMBERSTORMTECH HIGHLY RECOMMENDS
FLEXSTORM INSERTS IN ANY UPSTREAM
STRUCTURES WITH OPEN GRATES
8" (200 mm) HDPE ACCESS PIPE REQUIRED USE 8" OPEN END CAP
PART #: SC160IEPP08
SC-160LP END CAP
OPTIONAL INSPECTION PORT
ONE LAYER OF ADSPLUS125 WOVEN GEOTEXTILE BETWEEN
FOUNDATION STONE AND CHAMBERS
4' (1.2 m) MIN WIDE CONTINUOUS FABRIC WITHOUT SEAMS
SUMP DEPTH TBD BY
SITE DESIGN ENGINEER
(24" [600 mm] MIN RECOMMENDED)
INSPECTION & MAINTENANCE
STEP 1)INSPECT ISOLATOR ROW PLUS FOR SEDIMENT
A.INSPECTION PORTS (IF PRESENT)
A.1.REMOVE/OPEN LID ON NYLOPLAST INLINE DRAIN
A.2.REMOVE AND CLEAN FLEXSTORM FILTER IF INSTALLED
A.3.USING A FLASHLIGHT AND STADIA ROD, MEASURE DEPTH OF SEDIMENT AND RECORD ON MAINTENANCE LOG
A.4.LOWER A CAMERA INTO ISOLATOR ROW PLUS FOR VISUAL INSPECTION OF SEDIMENT LEVELS (OPTIONAL)
A.5.IF SEDIMENT IS AT, OR ABOVE, 3" (80 mm) PROCEED TO STEP 2. IF NOT, PROCEED TO STEP 3.
B.ALL ISOLATOR PLUS ROWS
B.1.REMOVE COVER FROM STRUCTURE AT UPSTREAM END OF ISOLATOR ROW PLUS
B.2.USING A FLASHLIGHT, INSPECT DOWN THE ISOLATOR ROW PLUS THROUGH OUTLET PIPE
i)MIRRORS ON POLES OR CAMERAS MAY BE USED TO AVOID A CONFINED SPACE ENTRY
ii)FOLLOW OSHA REGULATIONS FOR CONFINED SPACE ENTRY IF ENTERING MANHOLE
B.3.IF SEDIMENT IS AT, OR ABOVE, 3" (80 mm) PROCEED TO STEP 2. IF NOT, PROCEED TO STEP 3.
STEP 2)CLEAN OUT ISOLATOR ROW PLUS USING THE JETVAC PROCESS
A.A FIXED CULVERT CLEANING NOZZLE WITH REAR FACING SPREAD OF 45" (1.1 m) OR MORE IS PREFERRED
B.APPLY MULTIPLE PASSES OF JETVAC UNTIL BACKFLUSH WATER IS CLEAN
C.VACUUM STRUCTURE SUMP AS REQUIRED
STEP 3)REPLACE ALL COVERS, GRATES, FILTERS, AND LIDS; RECORD OBSERVATIONS AND ACTIONS.
STEP 4)INSPECT AND CLEAN BASINS AND MANHOLES UPSTREAM OF THE STORMTECH SYSTEM.
NOTES
1.INSPECT EVERY 6 MONTHS DURING THE FIRST YEAR OF OPERATION. ADJUST THE INSPECTION INTERVAL BASED ON PREVIOUS
OBSERVATIONS OF SEDIMENT ACCUMULATION AND HIGH WATER ELEVATIONS.
2.CONDUCT JETTING AND VACTORING ANNUALLY OR WHEN INSPECTION SHOWS THAT MAINTENANCE IS NECESSARY.
SC-160LP 6" INSPECTION PORT DETAIL
NTS
* THE PART# 2712AG6IPKIT CAN BE
USED TO ORDER ALL NECESSARY
COMPONENTS FOR A SOLID LID
INSPECTION PORT INSTALLATION
6" (150 mm) INSERTA TEE
PART# 6P26FBSTIP*
INSERTA TEE TO BE CENTERED
ON CORRUGATION CREST
FLEXSTORM CATCH IT
PART# 6212NYFX
WITH USE OF OPEN GRATE
PAVEMENT
CONCRETE COLLAR
CONCRETE COLLAR NOT REQUIRED
FOR UNPAVED APPLICATION
12" (300 mm) NYLOPLAST INLINE DRAIN
BODY W/SOLID HINGED COVER OR GRATE
PART# 2712AG6IP*
SOLID COVER: 1299CGC*
GRATE: 1299CGS
6" (150 mm) SDR35 PIPE
SC-160LP CHAMBER
18" (450 mm) MIN WIDTH
CONCRETE SLAB
8" (200 mm) MIN THICKNESS
PART #STUB A
SC160EPP 6" (150 mm)0.66" (16 mm)
8" (200 mm)0.80" (20 mm)
SC160EPP08 8" (200 mm)0.96" (24 mm)
ALL STUBS ARE PLACED AT BOTTOM OF END CAP SUCH THAT THE OUTSIDE
DIAMETER OF THE STUB IS FLUSH WITH THE BOTTOM OF THE END CAP. FOR
ADDITIONAL INFORMATION CONTACT STORMTECH AT 1-888-892-2694.
NOTE: ALL DIMENSIONS ARE NOMINAL
NOMINAL CHAMBER SPECIFICATIONS
SIZE (W X H X INSTALLED LENGTH)25.0" X 12.0" X 85.4" (635 mm X 305 mm X 2169 mm)
CHAMBER STORAGE 6.85 CUBIC FEET (0.19 m³)
MINIMUM INSTALLED STORAGE*16.0 CUBIC FEET (0.45 m³)
WEIGHT 24.0 lbs.(10.9 kg)
*ASSUMES 6" (152 mm) ABOVE, 6" (152 mm) BELOW, AND STONE BETWEEN CHAMBERS WITH 40% STONE POROSITY.
BUILD ROW IN THIS DIRECTION
START END
SC-160LP TECHNICAL SPECIFICATION
NTS
SC-160StormTech
6" N12
8" N12
SC-160StormTech
OVERLAP NEXT CHAMBER HERE (OVER SMALL CORRUGATION)
25.0"
(635 mm)
12.0"
(305 mm)
90.7" (2304 mm) ACTUAL LENGTH
85.4" (2169 mm) INSTALLED LENGTH
4.4"
(112 mm)
A
11.7"
(297 mm)
18.6"
(472 mm)
STORMTECH SC-160 LP PROFILE2SCALE: NTS
STORMTECH SC-160 LP PROFILE ISOLATOR ROW & INSPECTION PORT DETAIL3SCALE: NTS
STORMTECH SC-160 LP TECHNICAL DETAILS4SCALE: NTS
CONCEPTUAL ELEVATIONS
MAXIMUM ALLOWABLE GRADE (TOP OF PAVEMENT/UNPAVED):11.50
MINIMUM ALLOWABLE GRADE (UNPAVED WITH TRAFFIC):3.17
MINIMUM ALLOWABLE GRADE (UNPAVED NO TRAFFIC):2.67
MINIMUM ALLOWABLE GRADE (TOP OF RIGID CONCRETE PAVEMENT):2.67
MINIMUM ALLOWABLE GRADE (BASE OF FLEXIBLE PAVEMENT):2.67
TOP OF STONE:2.00
TOP OF SC-160LP CHAMBER:1.50
8" x 8" BOTTOM MANIFOLD INVERT:0.58
8" x 8" BOTTOM MANIFOLD INVERT:0.58
8" ISOLATOR ROW PLUS INVERT:0.58
8" ISOLATOR ROW PLUS INVERT:0.58
BOTTOM OF SC-160LP CHAMBER:0.50
BOTTOM OF STONE:0.00
PROPOSED LAYOUT
144 STORMTECH SC-160LP CHAMBERS
18 STORMTECH SC-160LP END CAPS
6 STONE ABOVE (in)
6 STONE BELOW (in)
40 STONE VOID
2612
INSTALLED SYSTEM VOLUME (CF)
(PERIMETER STONE INCLUDED)
(COVER STONE INCLUDED)
(BASE STONE INCLUDED)
2524 SYSTEM AREA (SF)
288.4 SYSTEM PERIMETER (ft)
MAX FLOWINVERT*DESCRIPTIONITEM ON
LAYOUTPART TYPE
0.96"8" x 8" BOTTOM MANIFOLD, MOLDED FITTINGSAMANIFOLD
0.96"8" x 8" BOTTOM MANIFOLD, MOLDED FITTINGSBMANIFOLD
2.2 CFS IN(DESIGN BY ENGINEER / PROVIDED BY OTHERS)CCONCRETE STRUCTURE
W/WEIR
2.2 CFS IN(DESIGN BY ENGINEER / PROVIDED BY OTHERS)DCONCRETE STRUCTURE
W/WEIR
ISOLATOR ROW PLUS
(SEE DETAIL)
PLACE MINIMUM 12.50' OF ADSPLUS625 WOVEN GEOTEXTILE OVER BEDDING
STONE AND UNDERNEATH CHAMBER FEET FOR SCOUR PROTECTION AT ALL
CHAMBER INLET ROWS
BED LIMITS
123.43'20.75'114.33'18.75'NOTES
•THE SITE DESIGN ENGINEER MUST REVIEW ELEVATIONS AND IF NECESSARY ADJUST GRADING TO ENSURE THE CHAMBER COVER
REQUIREMENTS ARE MET.
•NOT FOR CONSTRUCTION: THIS LAYOUT IS FOR DIMENSIONAL PURPOSES ONLY TO PROVE CONCEPT & THE REQUIRED STORAGE
VOLUME CAN BE ACHIEVED ON SITE.
*INVERT ABOVE BASE OF CHAMBER
AB
D C
STORMTECH SC-160 LP SYSTEM 15SCALE: NTS
*TO BOTTOM OF FLEXIBLE PAVEMENT. FOR UNPAVED
INSTALLATIONS WHERE RUTTING FROM VEHICLES MAY
OCCUR, INCREASE COVER TO 20" (510 mm).
NOTES:
1.PROVIDE CONTRACTION JOINTS SPACED AT NO MORE THAN WIDTH OF SLAB OR 10' MAX INTERVALS.
2.EXPANSION JOINTS SHALL BE PLACED AT JUNCTIONS WITH ADJACENT SLABS.
3.ROUND ALL SIDE EDGES AND JOINT EDGES WITH EDGING TOOL.
4.JOINT SEALANT PLACED OVER ROPE BACKING SET IN A 1 12" DEEP BY 34" WIDE GROOVE.
5.ANY RECOMMENDATIONS IN THE SITE GEOTECHNICAL REPORT REGARDING EXTERIOR CONCRETE
SLABS SHALL TAKE PRECEDENCE OVER THIS DETAIL
EXTERIOR CONCRETE SECTION W/ VEHICULAR TRAFFIC1SCALE: NTS
6" THICK M-4000 CONCRETE
9" MIN. THICK SECTION COMPACTED
3
4" MINUS CRUSHED ROCK BASE
WIDTH VARIES PER PLAN
SLOPE PER PLAN
GRAVEL SUBGRADE COMPACTED TO
MIN. 95% OF MAXIMUM DRY DENSITY
#4 REBAR @ 18" O.C. EACH WAY
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