HomeMy WebLinkAbout03487 - Technical Information Report (2)�
� TIR Addendum
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� FOR CONSTRUCTlON CHANGE #1 I
�� TO
_ Van's Auto Repair Shop
at
4405 NE 4t" Street
Renton, WA 98059
Building permit #B-080342
May, 2010
Prepared for:
Van Nguyen 8� Minh-Du Huynh
2012 Duvall Avenue NE �. . .. . �
Renton, WA 98059 (�='
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Prepared By: Jerry O'Connell, P.E. �' ��:��5�„�_��
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E M 0 1 N E f R S ! S U 9 V E Y O p 8 �
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Lovell-Sauerland & Associates, Inc.
19217 36th Avenue W. Suite 106
Lynnwood, Washington 98036
LSA FILE No: 5102
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TIR Addendum
FOR CONSTRUCTION CHANGE #1
TO
Van's Auto Repair Shop
at
4405 NE 4th Street
Renton, WA 98059
Building permit#B-080342
May, 2010
Prepared for: ,
Van Nguyen � Minh-Du Huynh I,
2012 Duvall Avenue NE
Renton, WA 98059
Prepared By: Jerry O'Connell, P.E.
■ C �� �
E M O 1 N E E R S / 8 U R V E Y O R b �
-- _ _ �
Lovell-Sauerland & Associates, Inc.
19217 36th Avenue W. Suite 106
Lynnwood, Washington 98036
LSA FILE No: 5102
I '
Executive Summary
This addendum has been prepared to provide supporting information for the proposed
construction change to substitute a `Stormtech' chamber detention system for the previously
approved CMP pipe manifold system. There is no proposed change to the previously approved
water quality system.
The following information has been provided in this report:
l. Revised KCRTS detention calculations for the chamber detention tank using a vault
design and adjusting the volume to simulate the 30%voids in the rock and the chamber
voids for an overall trench void ratio of 59.5%.
2. A copy of the 2 sheets from the approved plans that have been revised to accommodate
the change.
3. Backup documentation from Stormtech for the chamber system and the a `Tech Sheet' on
the thermoplastic liner.
Lo��ell-Sauerland and Associates Van's Auto Repair ��
Urainage Report Addendum April,2010
' LSA tl5102 Bldg Permit�B-080342
Project Overview
Project Name: Van's Auto Repair
Project Site Address: 24405 NE 4`h Street
Renton, WA 98059
Assessor Parcel Number: �182-1000-3902
Project Engineer: Lovell-Sauerland&Associates, Inc.
19400 33'd Avenue W., Suite 200
Lynnwood, Washington 98036
Phone: (425) 77�-1951
Project Applicant/Owner: Van Nguyen & Minh-du Huynh
2012 Duvall Ave NE
Renton. WA 980�9
Project Total Area: 0.�3�Acres (23,301sf)
Disturbed site area: 0.25 Acres
(project area)
Soils Data: Alde��ood(AgC-') - Type C soil
:llodeled as Till in KCRTS
Lovell-Sauerland and Associates Van's Auto Repair
Drainase Report Addendum April,20]0
� LSA#�102 I31de Permit�B-080342
KCRTS Detention Calculations
!, LOVELL-SAUERLAIVD&ASSOCIATES,INC.
__�� 1921736t1: j�:,Suite 106
Lynnwood, �f'A 98036
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Stormtech chamber option
Option with connection to new cb:
Bottom of chamber of 399.75 (bottom of rock=399.0)
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5102-chamber-calcs.docx
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Duration Comparison Anaylsis
Base File: predev-st.tsf
New File: rdout-st.tsf ,
Cutoff Units: Discharge in CFS I
-----Fraction of Time----- ---------Check of Tolerance------- �
Cutoff Base New %Change Probability Base New oChange !
0.003 I O. 10E-01 0.78E-02 -22.7 � O.10E-01 0. 003 0.003 -13. 1 '
0.004 � 0.73E-02 0.75E-02 2.9 I 0.73E-02 0. 004 0.004 2 . 6 '
0.004 I 0. 65E-02 0. 62E-03 -90.5 � 0. 65E-02 0.004 0.004 -7 . 0
0.005 I 0.59E-02 0.59E-03 -90.1 � 0.59E-02 0. 005 0.004 -14. 9
0.005 � 0.54E-02 0.57E-03 -89.5 I 0.54E-02 0. 005 0.004 -21. 6
0. 005 I 0.45E-02 0.55E-03 -87.8 � 0.45E-02 0. 005 0.004 -27 .3 i
0 . 006 � 0.41E-02 0.54E-03 -87.0 I 0.41E-02 0. 006 0.004 -32.3
0 . 006 I 0.38E-02 0.52E-03 -86.1 � 0.38E-02 0. 006 0.004 -36. 6
0 . 007 I 0.34E-02 0.52E-03 -84.5 I 0.34E-02 0. 007 0.004 -40.4
0 . 007 I 0.29E-02 0. 52E-03 -81.8 I 0.29E-02 0.007 0. 004 -43.7
0 . 008 � 0.27E-02 0. 49E-03 -81.6 � 0.27E-02 0.008 0. 004 -46.7
0. 008 � 0.24E-02 0. 47E-03 -80.4 � 0.24E-02 0.008 0.004 -49.4
0 . 008 � 0.22E-02 0. 42E-03 -81.0 � 0.22E-02 0.008 0,004 -51. 9
0 . 009 � 0.17E-02 0.39E-03 -77 .4 � 0. 17E-02 0.009 0.004 -54. 1
0. 009 ( 0.15E-02 0.33E-03 -78 .0 � 0. 15E-02 0.009 0.004 -56. 1
0 . 010 I 0. 14E-02 0.29E-03 -78 .3 I 0. 14E-02 0.010 0.004 -58.0
0.010 � 0. 99E-03 0.24E-03 -75. 4 � 0. 99E-03 0.010 0.004 -59.7
0.010 I 0. 83E-03 0.21E-03 -74 .5 I 0.83E-03 0. 010 0.004 -61.2
0.011 � 0.72E-03 0.18E-03 -75.0 I 0.72E-03 0. 011 0.004 -62 .7
0.011 � 0. 64E-03 0.18E-03 -71.8 � 0.64E-03 0. 011 0.004 -62.7
0.012 � 0.38E-03 0.13E-03 -65.2 I 0.38E-03 0. 012 0.009 -23. 4
0.012 � 0. 33E-03 0.98E-04 -70.0 � 0.33E-03 0.012 0.009 -21. 9
0.012 I 0.29E-03 0.82E-09 -72.2 I 0.29E-03 0.012 0.010 -22.7
0.013 I 0.28E-03 0.82E-04 -70. 6 I 0.28E-03 0.013 0.010 -24.5
0.013 I 0.21E-03 0.82E-04 -61.5 � 0.21E-03 0.013 0.010 -21.5
0 . 014 I 0. 18E-03 0. 65E-04 -63. 6 I 0.18E-03 0.014 0.011 -17.8
0 . 014 � 0. 15E-03 0. 65E-04 -55. 6 I 0.15E-03 0.014 0.011 -19.3
0 . 014 � 0. 15E-03 0.33E-09 -77.8 � 0. 15E-03 0.014 0.011 -21.6
0 . 015 I 0.82E-04 0.33E-04 -60.0 � 0.82E-04 0.015 0.013 -10. 1
0 . 015 � 0. 65E-04 O.00E+00 -100.0 I 0.65E-09 0.015 0.014 -6.1
0. 016 I 0. 16E-04 O.00E+00 -100.0 I 0. 16E-04 0.016 0.015 -3.7
0. 016 I 0. 16E-04 O.00E+00 -100.0 I 0. 16E-04 0. 016 0. 015 -6.2
Maximum positive excursion = 0.000 cfs ( 3.3°)
occurring at 0.004 cfs on the Base Data:predev-st.tsf
and at 0.004 cfs on the New Data:rdout-st.tsf
Maximum negative excursion = 0.007 cfs (-63. 1%)
occurring at 0.011 cfs on the Base Data:predev-st.tsf
and at 0.004 cfs on the New Data:rdout-st.tsf
Retention/Detention Facility
5102-chamber-calcs.docx
Type of Facility: Detention Arch Tank
Tank Rise: 4.75 ft � 5�£ �' (��- �
Tank Span: 4.40 ft ���t��
Tank Length: 220.00 ft �- ��
Effective Storage Depth: 4.75 ft
Stage 0 Elevation: 0.00 ft
Storage Volume: 3623. cu. ft
Riser Head: 4.75 ft
Riser Diameter: 12.00 inches '
Number of orifices: 1
Full Head Pipe
Orifice # Height Diameter Discharge Diameter
(ft) (in) (CFS) (in)
1 0.00 0.31 0.006
Top Notch Weir: Rectangular
Length: 3.00 in ,
Weir Height: 4.70 ft
Outflow Rating Curve: None
Stage Elevation Storage Discharge Percolation
(ft) (ft) (cu. ft) (ac-ft} (cfs) (cfs)
0.00 0.00 0. 0.000 0. 000 0.00
0.01 0.01 6. 0.000 0.000 0. 00
0.02 0.02 13. 0.000 0.000 0.00
0.03 0.03 19. 0.000 0.000 0.00 ,
0. 13 0.13 82. 0.002 0.001 0.00
0.23 0.23 146. 0.003 0.001 0.00 ,
0.33 0.33 209. 0.005 0.002 0.00
0.43 0.43 272. 0.006 0.002 0.00
0.53 0.53 338. 0.008 0.002 0.00
0. 63 0.63 426. 0.010 0.002 0.00
0.73 0.73 518. 0.012 0.002 0.00
0.83 0.83 518. 0.012 0.002 0.00
0. 93 0.93 705. 0.016 0.003 0.00
1.03 1.03 799. 0.018 0.003 0. 00
1. 13 1.13 896. 0.021 0.003 0.00 '
1.23 1.23 993. 0.023 0. 003 0.00 I
1.33 1.33 1090. 0.025 0.003 0.00 �i
1. 43 1.43 1187. 0.027 0.003 0.00
1.53 1.53 1283. 0.029 0.003 0.00
1. 63 1.63 1380. 0.032 0.003 0.00 ,
1. 73 1.73 1472. 0.034 0.003 0. 00 'i
1. 83 1.83 1569. 0.036 0.004 0.00 �
1. 93 1.93 1663. 0.038 0.004 0.00
i , , 2.03 2.03 1758. 0.040 0.004 0.00
2. 13 2.13 1850. 0.042 0. 004 0.00
2.23 2.23 1943. 0.045 0. 004 0.00
2.33 2.33 2035. 0.047 0.004 0.00
2. 43 2.43 2122. 0.049 0.004 0.00
� 2.53 2.53 2213. 0.051 0.004 0.00
2. 63 2.63 2301. 0.053 0.004 0.00
- 2.73 2.73 2388. 0.055 0.004 0. 00
5102-cha m be r-ca Ics.d ocx
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2.83 2.83 2472. 0.057 0. 004 0.00
2. 93 2.93 2557. 0.059 0.005 0.00
3.03 3.03 2640. 0.061 0.005 0.00
3. 13 3. 13 2718. 0.062 0.005 0.00
3.23 3.23 2796. 0.064 0.005 0.00
3.33 3.33 2903. 0.067 0.005 0. 00
3. 43 3.43 2950. 0.068 0.005 0. 00
3.53 3.53 3022. 0.069 0.005 0.00
3. 63 3. 63 3094. 0.071 0.005 0.00
3.73 3.73 3160. 0.073 0.005 0.00
3.83 3.83 3225. 0.074 0.005 0.00
3. 93 3.93 3285. 0.075 0. 005 0.00
4 .03 4.03 3343. 0.077 0. 005 0.00
4 . 13 9 .13 3401. 0.078 0. 005 0.00
4.23 4.23 3950. 0.079 0. 005 0.00
4.33 4.33 3997. 0.080 0. 006 0.00
4. 43 4.43 3540. 0.081 0.006 0. 00
4 .53 9 .53 3575. 0.082 0.006 0. 00
4 . 63 4.63 3605. 0.083 0.006 0. 00
4.70 4.70 3618. 0.083 0.006 0.00
4.71 4.71 3619. 0.083 0.007 0.00
4.72 4.72 3620. 0.083 0.009 0.00
4.73 4 .73 3621. 0.083 0.010 0.00
4.74 4 .74 3622. 0.083 0.013 0.00
4.75 4 .75 3623. 0.083 0.015 0.00
4. 85 4.85 3623. 0.083 0. 323 0. 00
4. 95 4.95 3623. 0.083 0. 886 0.00
5.05 5.05 3623. 0.083 1. 620 0.00
5. 15 5.15 3623. 0.083 2.410 0.00
5.25 5.25 3623. 0.083 2. 690 0.00
5. 35 5.35 3623. 0.083 2. 940 0.00
5.45 5.45 3623. 0.083 3.180 0.00
5.55 5.55 3623. 0.083 3.400 0.00
5. 65 5.65 3623. 0.083 3.600 0. 00
5.75 5.75 3623. 0.083 3.800 0.00
5.85 5.85 3623. 0.083 3. 980 0. 00
5. 95 5.95 3623. 0.083 4 . 160 0.00
6.05 6.05 3623. 0.083 4 .330 0.00
6. 15 6.15 3623. 0.083 4 .490 0.00
6.25 6.25 3623. 0.083 4. 650 0.00
6. 35 6.35 3623. 0.083 4.800 0.00
6. 45 6.45 3623. 0.083 4 . 950 0.00
6.55 6.55 3623. 0.083 5.090 0. 00
6. 65 6.65 3623. 0.083 5.230 0.00
6.75 6.75 3623. 0.083 5.360 0.00
Hyd Inflow Outflow Peak Storage
Target Calc Stage Elev {Cu-Ft) (Ac-Ft)
1 0.10 0.02 0.03 4.76 4.76 3623. 0.083
2 0.05 ******* 0.01 4.73 4.73 3621. 0.083
3 0.06 ******* 0.00 3.84 3.84 3233. 0.074
4 0.07 ******* 0.00 3.46 3. 46 2972. 0.068
5 0.06 ******* 0.00 2.76 2.76 2410. 0.055
6 0.06 ******* 0.00 2.16 2. 16 1875. 0.043
5102-chamber-calcs.docx
'
7 0.04 ******* 0.00 1. 89 1. 89 1629. 0. 037
8 0.05 ******* 0.00 1. 60 1. 60 1353. 0. 031
----------------------------------
Route Time Series through Facility
Inflow Time Series File:dev-st. tsf
Outflow Time Series File:rdout
Inflow/Outflow Analysis
Peak Inflow Discharge: 0. 102 CFS at 6:00 on Jan 9 in Year 8
Peak Outflow Discharge: 0.032 CFS at 11:00 on Jan 9 in Year 8
Peak Reservoir Stage: 4 .76 Ft
Peak Reservoir Elev: 9 .76 Ft
Peak Reservoir Storage: 3623. Cu-Ft
. 0.083 AC-Ft
Flow Frequency Analysis
' Time Series File:rdout.tsf
Project Location:Sea-Tac
' ---Annual Peak Flow Rates--- -----Flow Frequency Analysis-------
Flow Rate Rank Time of Peak - - Peaks - - Rank Return Prob
(CFS) (CFS) (ft) Period
0.011 2 2/10/Ol 17:00 0. 032 4.76 1 100.00 0. 990
-- 0.004 7 12/29/O1 10:00 0.011 4.73 2 25.00 0. 960
0.005 3 3/07/03 0:00 0.005 3.84 3 10.00 0. 900
0.003 8 8/26/04 7:00 0.005 3.96 4 5.00 0.800
0.004 6 1/08/05 3:00 0.004 2.76 5 3. 00 0. 667
0.004 5 1/19/06 3:00 0.004 2. 16 6 2. 00 0.500
0.005 4 11/24/06 10:00 0.004 1.89 7 1. 30 0.231
0.032 1 1/09/08 11:00 0.003 1. 60 8 1. 10 0.091
Computed Peaks 0.025 4.75 50.00 0. 980
Flow Duration from Time Series File:rdout.tsf
_ Cutoff Count Frequency CDF Exceedence Probability
CFS ° ° ° -
0 0 0
0.000 77 0. 126 0. 126 99.874 0. 999E+00
0.000 34846 56.826 56. 952 43.048 0.430E+00
0.001 2577 4 .203 61. 155 38.845 0.388E+00
_ 0.001 1650 2 .691 63.895 36.155 0.362E+00
0.001 5372 8 .761 72.606 27.394 0.274E+00
0.001 924 1.507 74.113 25.887 0.259E+00
0.002 744 1.213 75.326 24.674 0.247E+00
0.002 7732 12.609 87. 935 12.065 0. 121E+00
0.002 869 1.417 89.353 10.647 0. 106E+00
0.003 669 1.091 90.444 9.556 0. 956E-01
0.003 538 0.877 91.321 8.679 0.868E-01
0.003 3646 5.946 97 .267 2.733 0.273E-01
0.003 82 0. 134 97. 401 2.599 0.260E-01
0.004 73 0.119 97.520 2.480 0.248E-01
0.004 63 0.103 97. 622 2.378 0.238E-01
0.004 1136 1.853 99.475 0.525 0.525E-02
0. 004 13 0.021 99.496 0.504 0.504E-02
0.005 27 0.049 99.540 0. 460 0. 460E-02
5102-cham ber-ca Ics.docx
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S'tormtech Manufacturer's Information
LOVELL-SAUERLAND c�ASSOCIATES,INC.
19217 36tlr W.,Sui1e 106
L}�nnwood, K'A 98036
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StormTech ��
Detenlion•Retentron•Recharge '
Subsurface Sformwater Management�" '
MC-3500 ��
Design Manual -
StormTech$ Chamber Systems _
for Stormwater Management
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1.0 Product Information....................................................................................................................................................2
2.0 Foundations for Chambers ........................................................................................................................................5
3.0 Required MaterialslRow Separation ..........................................................................................................................6
4.0 Hydraulics ................ ............................................................................8
......................................................................
5.0 Cumulative Storage Volume ....................................................................................................................................10
6.0 System Sizing ..........................................................................................................................................................12
7.0 Structural Cross Section and Specifications............................................................................................................13
8.0 General Notes ..........................................................................................................................................................14
StormTech Technical Services Department assists design professionals in specifying StormTech stormwater systems.
This assistance includes the layout of chambers to meet the engineer's volume requirements and the connections to
and from the chambers. The Technical Department can also assist converting and cost engineering projects currently
specified with ponds, pipe, concrete vaults and other manufactured stormwater detention/retention products. Please
note that it is the responsibility of the design engineer to ensure that the chamber bed layout meets all design require-
ments and is in compliance with applicable laws and regulations go�erning a project.
srRucTuae wini wew
(DESICaN BY ENGWEER/PROVIDED BY OTHERS) .
I MANIFOLD(SIZE TBO BV ISOLATOR ROW �H�PE VNDERDRAI�N(SIZE
ENGINEERSEE TECH SHEETX7—. i / TBD BY ENGINEER I SHONRJ �
FOR MANIFOLD SIZING �'�,, � AS 6� .
GUIDANCE!SFiOWN AS 15'X 1Sj
PLACE MINIMUM 1ZS OF AASHTO MANIFOLD(SRE TBD BY .
M288CLASSI WOVEN �ENGINEER/SEETECHSHEET �,
GEOTEXTILE OVER BEDDWG M7 FOR MANIFOLD SIZING
'i STONEFORSCWRPROTECTION GUIDANCE/SHOWNAS ,
'oo - ATALLCHAMBERINLETROWS 1SX15' ��.
STRUCNRE WITH WEIfl �.
� , (DESIGN BY ENGWEER/ ��,
' PROVIDE�BY O7HERS) ��..
� I
OUTLET MANIFOL�(SIZE TBD �'�
� �BY ENGINEEF/SEE TECH I
j SHEET Y7 f-0R MANIFOLD I
SRING GUIDANCE/SHOWN i
AS 15"x 15') I
. ISOLATOR ROW II
OUTLETCONTROL I
��� � `-STFUCTURE�DESIGN
BV ENGINEER!
37.08' — PROVIDEDBYOTHERS)
on� oanwri cHec�o oesca�ran � PROPOSED STORMTECH MC-3500
� �T� PLAN LAYOUT
m erovm aow,w�id DATE: 4-7-09 PROJECT-
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v�.msa9z-�6v, DRAWN: MK SGLLE: NTS
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lO�m�`�'•�`������""'��`�'y �'+�+'ST���� CMECKED: �JM PAGE: Of
' This man�al is exclusively intended to assist engineers in the design o. subsurface stormwater systems usmg SiormTech chambers.
,_________ .._�T_�.___._�� . --.�.. .�____ ___ _ .�_ �__� �_.__
1 Call StormTech at 860.529.8188 or 888.892.2694 or visit our website at www.stormtech.com for technical and product information.
.�.�
� �� Pro���� Ir�for������ StormT�h•
Figure 1
StormTech MC-3500 Chamber(not to scale) `I � �II (�� i� l,r �I � i ( �
Nominal Chamber Specifications II I
� � ' � �
Size(L x W x H) 90'(2286 mm)x 77'(1956 mm)x 45'(1143 mm) , � ��
Chamber Storage 113.0 ft'(3.20 m') � '
Min.Installed Storage' 176.8 ft(5.01 m') � I ,. `
�
Weight 124 Ibs(56.2 kg)
�li ��� � I
�,,, ��j ,�, l� i�''� ;,� � '�'' ��,'� �, ,1
90.0"(2286 mm)
�86.0"(2184 mm)INSTALLED---�
I �
j 45.0" I I
� �,� (1143 mm�
r '� I
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�_ -- 77.0"(1956 mm) �-� - �
Figure 2
StormTech MC-3500 End Cap(not to scale)
Nominal End Cap Specifications
Size(L x W x H) 26.5'(673 mm)x 71'(1803 mm)x 45.1'(1145 mm)
End Cap Storage 15.6 ft'(0.44 m')
Min.Installed Storage' 45.6 ft'(1.29 m')
WeigM 43 Ibs(19.5 kg) �, 22.s^ r--
� (574 mm)
� INSTALLED ��
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� � 45.1" i � (
(1145 mm) i
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26.5" I
�71.0'(1803 mm)� (673 mm)�
'This assumes a minimum of 12`(305 mm)of stone above,9'(229 mm)of stone below antl 6'(152 mm)of stone between the chambers/end caps and
40%stone porosity.The end cap minimum installed storage also includes the stone storage located in the 6"(152 mm)stone perimeter.
, Call StormTech at 860.529.8188 or 888.692.2694 or visit our website at www.stormtech.com for technical and product information. 2
� s
� ��� � ������� ���� � ���� StormTech•
1.1 PRODUR DESIGN 1.2 TECHNICAL SUPPORT
StormTech's commitment to thorough product testing The StormTech Technical Services Department is available
programs, materials evaluation and adherence to nation- to assist the engineer with the layout of MC-3500 chamber
al standards has resulted in another superior product. systems and answer questions regarding all the StormTech
Like other StormTech chambers, the MC-3500 is chamber models. Call the Technical Services Department,
designed to meet the full scope of design requirements email us at techinfo�stormtech.com or contact your
of Section 12.12 of the AASHTO LRFD Bridge Design locai StormTech representative.
Specifications and produced to the requirements of the
American Society of Testing Materials (ASTM) 1.3 MC-3500 CHAMBER
International specification F 2418 "Standard All StormTech chambers are designed to the full scope
Specification for Polypropylene(PP)Corrugated of AASHTO requirements without repeating end walls or
Stormwater Collection Chambers". other structural reinforcing. StormTech's continuously
The StormTech MC-3500 chamber provides the full curved, elliptical arch and the surrounding angular
AASHTO safety facto�.s for live loads and permanent backfill are the key components of the structural system.
earth loads. The ASTM F 2418 standard is linked to the With the addition of patent pending integral stiffening
AASHTO LRFD Bridge Design Specifications Section ribs�Figure 3), the MC-3500 is assured to provide a long,
12.12 design standard. ASTM F 2418 requires that the safe service life. Like other StormTech chambers, the
safety factors included in the AASHTO guidance are MC-3500 is produced from high quality, impact modified
achieved as a prerequisite to meeting ASTM F 2418. virgin polypropylene which is tested for short-term and
StormTech chambers are also designed in accordance �ong-term mechanical properties.
with ASTM F 2787 "Standard Practice for Structural
Design of Thermoplastic Corrugated Wail Stormwater
Collection Chambers" which provides specific guidance '
on how to design thermopiastic chambers in accor-
dance with AASHTO Section 12.12. The three standards
provide both the assurance of product quality and safe
structural design. o
The design of a larger chamber in the same tradition of � ��!
our other chambers required the collaboration of experts
in soil-structure interaction, plastics and manufacturing.
Years of extensive research, including laboratory testing With the MC-3500, one chamber type is used for the
and field verification, were required to produce a cham- start, middle and end of rows. Rows are formed by over-
ber that is ready to meet both the rigors of installation lapping the upperjoint corrugation of the next chamber
and the longevity expected by engineers and owners. over the fower joint corrugation of the previous chamber
This MC-3500 Design Manual provides the details and (Figure 4).
specifications necessary for consulting engineers to The MC-3500 is designed with an optimized joining system.
design stormwater management systems using the The height and width of the end corrugations have been
MC-3500 chamber. It provides specifications for storage designed to provide the required structural safety factors
capacities, layout dimensions as well as requirements while providing an unobstructed flow path down each row.
for design to ensure a long service life. The basic
design concepts for foundation and backfill materials,
subgrade bearing capacities and row spacing remain
equally as pertinent for the MC-3500 as the SC-740 and
SC-310 chamber systems. However, since many design
values and dimensional requirements are different for
the MC-3500 than the SC-740 and SC-310 chambers,
design manuals and installation instructions are not
interchangeable.
This manual includes only those details, dimensions,
cover limits, etc for the MC-3500 and is intended to be
a stand-alone design guide for the MC-3500 chamber.
Installation Instructions specifically for the MC-3500
have also been published.
, _ _.__ _ _.._ _. __ __ -- --_____�___- -_ .- ._.,._ _ -___.. .. ______.__._.- ------__
3 Call StormTech at 860.529.8188 or 888.892.2694 or visit our website at www.stormtech.com for technical and product information.
� �� �� - �� ������ ����� StormTecha
To assist the contractor, StormTech chambers are molded 1.4 MC-3500 END CAP
with simple assembly instructions and arrows that indicate The MC-3500 end cap is very easy to install. The
the direction in which to build rows. The corrugation MC-3500 end cap is designed with a corrugation joint
valley immediately adjacent to the lower joint corrugation that fits over the top of either end of the chamber. The
is marked "Overlap Here- Lower Joint." The corrugation end cap joint is simply set over the top of either of the
valiey immediately adjacent to the upper joint corrugation upper or lower chamber joint corrugations(Figure 5).
is marked "Build This Direction-Upper Joint." Three(3)screws fasten the end cap to the chamber
Two people can safely and efficiently carry and place to maintain a positive connection during backfilling.
chambers without cumbersome connectors, special Handles are molded into the end cap to enable one
tools or heavy equipment. Each row of MC-3500 cham- person to carry and set the end cap in place.
bers must begin and end with a joint corrugation. Field
cutting is not recommended. For system layout assis- 1.5 MC-3500 PRE-CORED END CAPS
tance contact StormTech. End caps with pre-cored 18" and 24' bottom conneo- ,
tions and 15"top connections are standard parts.
Other pre-cored end cap configurations are available
by special order. See StormTech details. '
Figure 3—Chamber and End Cap Components '
—UPPER JOINT =VALLEY ,—LOWER JOINT
% CORRUGATION ' STIFFENING RIB ` CORRUGATION
�CREST ,rVALLEY ;VENT %� —END CAP JOINT
�WEB %� HOLES % � CORRUGATION �
% r-'�-�
HANDLE
SHELL i
� '
SCREW �
HOLE '
FOOT BUILD ROW IN THIS DIRECTION — CREST - I
STIFFENING Fil6 i
—HANDLING PORT(4 LOC) ��
Figure 4—Chamber Joint Overlap Figure 5—End Cap Joint Overlap '
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Call StormTech at 860.529.8188 or 888.892.2694 or wsit our website at wwwstormtech.com for technical and product information. 4
�` � � .�� = � = �.�<'" � ����`
2.1 FOUNDATION REQUIREMENTS LIVE AND DEAD LOAD
StormTech MC-3500 chamber systems can be installed �� �
in various soil types.The subgrade bearing capacity and the i '
cover height over the chambers determine the required
depth of clean,crushed,angular foundation stone below sTONE
the chambers. Foundation stone, also called bedding, COLUMN �.
is the stone between the subgrade soils and the feet of � � ,`�>�„ ',�" "
, �. � ..�
the chamber. Flexible structures are designed to transfer � � '�<•, LOAD --" r }�
I '�•; �,
.��;�, PATH f ' �o;
a significant portion of both live and dead loads through �� `,�� ��� (( ,-:
the surroundin soils. Chamber s stems accom lish this � "' ���'� ;N�',�"' "��
9 Y P �-- �1� I�H
by creating load paths through the columns of embed- ----
ment stone between and around the rows of chambers. FouNoaTioN �sTONE
This creates load concentrations at the base of the �susGRA�E `—_-'
columns between the rows. The foundation stone spreads II—���fl �I I —i' I— � i '
out the concentrated toads to distributed loads that can � ��I I ��� � I I�� I_
b e s u p p o r t e d b y t h e s u b g r a d e s oi l s.
Since increasing the cover height(top of chamber to 2.2 WEAKER SOILS
finished grade)causes increasing soil load, a greater StormTech has not provided guidance for subgrade
depth of foundation stone is necessary to distribute the bearing capacities less than 2000 pounds per square
load to the subgrade soils. Table 1 specifies the minimum foot [(2.0 ksf)(96 kPa)]. These soils are often highly vari-
required foundation depths for varying cover heights able, may contain organic materials and could be more
and allowable subgrade bearing capacities. The table sensitive to moisture. A geotechnical engineer must be
is based on StormTech service loads and standard 6" consulted if soils with bearing capacities less than 2000
(152 mm) row spacing for the MC-3500. The minimum psf(96 kPa) are present.
required foundation depth is 9"(229 mm).
Tahle 1 -Minimum Required Foundation Depth in Inches(mm)
� :. �r..,,-s'' � -. - -- 9�'LT2� ��e 'z . 5 .- � ;.��_ .. � -_ �,.� �` �
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2.0 9 . 9 9 ' 9 9 9 9 ^ 9 9 9 �9 9# 9 9 � 9 12 12 ' 12 , 12 15 i3 ` 15 18 : 18 ' 24
(0.61)'(229) (229) (229)'(229) (229) (229) (229) (229) �229) (229► (229) (229) (2291;(229) (229) (305) (305) (305) (305� �381j (38t)`(381) (45�!(45� (610)
2.5 9 9 9 9 9 9 9 9 9 9 9 9 9 9 ' 12 12 12 12 15 15 15 18 18 24 24
(OJ6) (229�;(229) (229),(229) (229) (229) (229) (229) (229) (229) (229) (229) (229) (229) (305} (305) (3(}5) {305) (381) (381� (381},(45� (45�'(6101;(6101
3.0 9 ! 9 9 9 9 9 9 9 9 9 9 9 12 12 12 12 ' 15 15 15 18 18 18 24 24 : 24
(0.91) (229);(229)',(229) (Y19);(229) (229) (229) �229) (229) (229) (229) (229) (305) f305I (305) {305),(381) (381) (381); I457� (45� (45� (610) (610);I61O)
3.5 ' 9 9 ! 9 ` 9 ' 9 9 9 9 9 ` 9 12 I 12 : 12 '. 12 12 15 15 15 18 18 24 24 24 24 ' 30
(1.071;(229);(229)!(229)'(229} �229) (229) (229) (229) (229) (229) (305) (305),(305),(305) (305)i(381):(381) (381}! 145�t(45� (610) (610) (610) (610)l(762)
4A 9 9 ' 9 9 9 9 9 ' 9 12 12 12 12 ' 12 15 15 : 15 18 18 18 24 24 24 24 30 ` 30
(1.22) (229) (229):(229),(229} (229) (229) (229) (2291 (305) (30.5) (305) (305) (305) (381� (381},�38f) (457) (457) (45� (610) (610) (610) (610) p62) (762)
4.5 9 9 9 9 9 9 9 12 12 ' 12 12 15 15 15 : 15 18 ' 18 18 24 24 24 24 30 30 '. 36
(1.3� (229) (229) (229) �229) (229) (229) (229) (305) (305) (30.5) (305) (381) (381) (381) (381}.(45� (45�;(457) (610) (610) (610) (610) (762) p62)'(914)
5.0 9 9 9 9 9 12 . 12 12 12 12 15 15 15 18 18 ' 18 18 : 18 24 24 24 30 30 36 36
(1.52) �229)';(229) (229) (229) (229) (305) (305) (305) (305) (305) (381) (381) �381) (457) (45� (45n (45�,(45� (610) (610) (610) (762) (/62) (914)'(914)
5.5 ' 9 ° 9 9 : 12 12 12 12 12 15 15 15 15 18 18 18 24 24 24 24 24 30 30 36 ' 36 42
(1.68►.(229) (229) (229);(305):(305) (305) (305) (305) (381) (381) (381) (381) (45� (45� (457) (610) (610),(610) (610) (610) (762) (762) (914)'(914)(106�
6.0 9 9 12 12 ' 12 12 15 15 15 15 18 18 18 18 24 24 24 24 24 30 30 36 36 42 42
(1.83).(229) (229)'(305).(305) (305} (305) (381) (381} (381) (381) (457� (45� (A57) �45� (610) (610)'(610) (610) (610) p62) p62) (914) (914):(1067��1067)
6.5 9 12 12 12 12 12 15 15 15 15 18 18 18 24 24 24 24 24 30 30 30 36 36 42 42
(1.98) (229) (30.5) (305) (305) (305) (305) (381) (381) (381) (381) (45� (45� (45n (45� (610►;(610);(610) �610) p62) (762) (762) (914) (914) (1067y(106�
. . _.';# .. ,r: �_'�.`< -
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5 Call StormTech at 860.529.8188 or 888.892.2694 or wsit our website at www.stormtech.com for technical and product information.
�- �
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3.1 FOUNDATION AND EMBEDMENT STONE stormwater storage.Table 2 provides the stone specifica-
The stone surrounding the chambers consists of the tions that achieve both structural requirements and a
foundation stone below the chambers and embedment porosity of 40%for stormwater storage. Figure 6 specifies
stone surrounding the chambers.The foundation stone the extents of each backfill stone location.
and embedment stone are important components of the
structural system and also provide open void space for
TABLE 2-Acceptable Fill Materials
� �j ��� #,� � ��- � d�"�'��� �� ` :, � `�
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`_�->- - .._ .1 ,���. '� ..=- -a _ . . ._�.- . . . _ ��stl'.c€d�1F�
QD Fill Material for iayer'D'starts from Any soil/rock materials,native N/A Prepare per engineer's plans.Paved installations
the top o1 the'C'layer to the bottom soils or per engineer's plans.Check may have stringent material and preparation ;
of flexible pavement or unpaved finished plans for pavement subgrade requirements.
gratle above_Note that the pavement requirements.
subbase may be part of the`D'layer.
- --__--- ------- - __---------- ---- _ _ - ------ ----�
C�Fill Material for layer'C starts from Granular well-graded soiVaggregate, 3,357,4,467,5, Begin compaction after 24'(610 mm)of material
the top of the embedment stone(`B'layer) mixh�res,<35%fines.Most , 56,57,6,67,68,, over the chambers is reached.Compact additional laye�s '
to 24'(610 mm)above the top of the pavement subbase materials can 7,78,8,89,9,10 in 12"(305 mm)max.lifts to a min.95°ro Standard
chambec Note that pavement subbase be used in lieu of this layec ; Proctor densiry.See MC-3500 Installation Instructions
may be part of the'C'layer. (AASHTO M145 A-1,A-2,A-3) for acceptable compaction equipment loads.
_ --------- - - ----- ----------- ---- ----------- __ - ---------- -
OB Embedment Stone surrounding Clean,crushed,angular stone, 3,357,4,467,5,, No compaction required.
chambers from the foundation stone nominal size distribution 56,57
to the'C'layer above. 3/4-2'(19 mm-51 mm)
QA Foundation Stone below Ihe Clean,crushed,angular stone, 3,357,4,467,5, Plate compact or roll to achieve a 95%
chambers from the subgrade up to the nominal size distribution 56,57 Stantlard Proctor Density.z ,
foot(bottom)of the chamber. 3/4-2"(19 mm-51 mm)
,:.. ;�rC'Tf:
'�2�rSiB�?f�f?31Y':�LT�'S+ytivi:CiFS d.�8;�.^,�I�'r3a8ti0tls 91�ij'. `�'8 St0lIB f71�St 2eSC 'Jc:(E3A, C�EIS�!cG, 3:?PL�:`�f, fD!'unclP:�;a, �
:;;$Clf%C8ll.�'ir7 f�J(;��5�0�'L' W`0.°/�`sta?e "ciaan, �I!/Sj#2�; �r��ur�r no. 4(.4.4SHT�1�4��Sf0!tE.,
,_ L:�a�fPlfiuiP;`r rnn 1 T�: . %7.an!'iJ�{ft Ele11$if °.','��..r`!�7'Frf ;ar rts a�C /" L`f:7r77T:. h ..� n r rF t.3`?. f4 p �';P?
: . � Y � s cn op .r� �� io e: _�. :, ;a�Y,. �;,:;,;:,ar. �
F'U��l� 6-F�II IYlale��al �QCal�Ons -MO TPA,VEMENTSUB�GRhDEMATERNISCANBEI/SE�INLIEUDF
REQUIREMENTS FOR IAYERS'CJ d(D�
ii-iiioiiiiii i�i»»i�i��ia��ii«rr��rr�rrr�r�o�l�ia rirr�rnmi�iiiiiiiiiiiiiriio�o��i�nlizriiizi�rnz�rzizr,
'TO BOTTOM OF FLEXIBLE PAVEMENT.
-- ---- - .. . _-
OnCe layef`C'i5 plaCed FOR UNPAVED INSTALLATIONS,WHERE-
any SOII/material Can - � --- _ O�F R��� RUTTING FROM VEHICLES MAY OCCUR, . _.. �i�m�
INCREASE COVER TO 30"[762 mm). �
be placed in layer`D' � � �s�a„M,�
up to the finished ,z•�aos mm�MiN. MiN.,
grade.Most pavement � ' - '
subbase soils can be �`` � -'
used to replace the /. �I `� rol ,!j'/ / \ / \ \\
materials requirements � � _
of layer`C'or'D'at the � d �'I � '' %� � � �,, i n C' � , �i�4 mm)
design engineer's � �% � �` '''_ �� �
l I �� ,
discretion. \ � , ��, i _
;
,;�` � . �- �i. _�i :�� .. . 6. DEPTHOFSTONE
.�-.- .__._._. .. . . . .. -- -
i A._ .- _..__ -,__ _. ____._ .'_ BYDESIGN NGINE R
_� ., � . .�_--- :_.-_- . . _,_ - , r.��_ - 9'1229mm�MIN.
, .. - _.. ._ . _. _: ._...__._ ._-: __�_. -__--_ -.`-. .._.
� , --
'� 6'(152 mm)MIN. 7T(7956 mm) 12(305 mm�MIN.
���,�MSH�O M2E8 CL/SS 2 NON-WOVEN
GEOTE%TAE Al1 ARIXIW ANGIXAR STONE
' Call StormTech at 860.529.8188 or 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 6
_ - .�. �-� ��� _ ��� �� ����� �� ������t- II'
3.2 FI�I ABOVE CHAMBERS 3.3 GEOTEXTILE SEPARATION
Refer to Tabie 2 and Figure 6 for acceptable fill material A non-woven geotextile meeting AASHTO M288 Class 2
above the clean, crushed, angular stone. StormTech separation requirements must be installed to completely
requires a minimum of 24' (610 mm) from the top of envelope the system and prevent soil intrusion into the
the chamber to the bottom of flexible pavement. For crushed, angular stone. Overlap adjacent geotextile rolis '
non-paved installations where rutting from vehicles may per AASHTO M288 separation guidelines. See Table 3
occur StormTech requires a minimum of 30'(762 mm) for a list of acceptable geotextiles.
from top of chamber to finished grade.
TABLE 3-Some Suitable Geotextiles
�� - �._�,. __ _ � �� �
�.�� '1��`'E'sa <..i: �g.t.e- ` .x �:�- . . . �_��-� �s- � `�,i11�:�j6 '�-�
I�
Belton Industries ' Beltech 977
----- - --- - ---------__ _ __ - -
Carthage Mills -_-FX-60HS.FX-80HS ' FX-66
- -- --- --------- _- - --- ------- -------- --
GSE Lining Technology NW6,NW8 — '
- ----- - -- --___
- ------------.__ - - ----- --
Maccaferri MacTex MX245,MacTex MX275 —
_---- -- - ---- --- ----- ---- ------- --- ___ ___
Pavco-Amanco NT3000M,NT4000M TR 4000
---------- - ---- ---- --- ---=- --- - — - _
Propex Geotex 651,Geotex 861,Geotex 601,Geotex 701,Geotex 801 Geotex 315ST,Geotex�2HF,Geotex 250ST
SKAPS Industries ' GT 160NW,GT 180NW �. W315
------ ----- ----- --------- ---- ---------- _ ----
: Tencate Mirafi ; Mirafi 160N.Mirafi 180N Mirafi 600X,Filterweave 403,Filterweave 404, '
' Geolon HP570,Geolon HP665,Geolon HP770
-- -- --------- -- ----
__ _---__------- -
TNS Advanced Tech. R060,R070,RO80,R100 —
------------ ------- -- -------- — -------- _ --- - ----
US Fabrics ', US 205NW,US 160NW US 315
`AASHTO M288 Class 2 Non-Woven Geotextile Application:1.Separation layer between angular stone and surrounding soils to prevent iines intrusion.
2.Filter layer over the chambers ot lhe StormTech IsolatorT"Row to prevent fines migration out ot row while maintaining adequate hydraulic tlows.
'"AASHTO M288 Class 1 Woven Geote�ile Appliption:1.Filtration/stabilintion layer for the angular stone toundation of the StormTech IsolatorTM Row to prevent scouring
oi the stone base during the Je[Vac maintenance procedure,modest hydraulic tlows maintained.2.At each inlet row to prevent scouring of the foundation stone.
3.4 PARALLEL ROW SEPARATION/ �,, °{ ��� � �
PERPENDICULAR BED SEPARATION �� ������� .�
Parallel Row Separation - �� � �
The minimum installed spacing between parallel rows : ���� � �
after backfilling is 6'(152 mm)(measurement taken ,�t z ����'��� -
between the outside edges of the feet). Spacers may be ` �,�'° ; ���� �
used for layout convenience. Row spacing wider than y r��
the minimum 6"(152 mm) may be specified. ti,,;��=a ��
�-,rcj-Q.'�'�,.: -
Increasing the spacing between chamber rows may t"'��--�`
allow the application of StormTech chambers with either -'- '''��`�� �
less foundation stone or with weaker subgrade soils. �__.a,� _ ��
This may be a good option where vertical restrictions on _ �_
site prevent the use of a deeper foundation. „y '�
�r.�r_ >
Perpendicular Bed Separation -" ��_
When beds are laid perpendicular to each other, a � ti _
'�`�� `$�,�
minimum instalied spacing of 36" (914 mm) between -:.� � ' � 'g.- t�-� �
beds is required. �_ r._.�`'�_ -�- �_� =. ^
Spacers for row separation.
' _ _ _ -__. _ ._ .--. __ ._ _ ._ __ _ _ _
7 Call StormTech at 860.529.8188 or 888.892.2694 or visit our website at www.stormtech.com for technical and product information.
5-�: -
�.0 t�ydr������ StormTech•
�;..._.�� -_-_ . e : __�. _. :.�.� ���w _....r._�.�v -_. _ _
- -- . r _.,.�� �
4.1 GENERAL 4.2 THE ISOLATORT"'' ROW
StormTech subsurface chamber systems offer the flexibility The Isolator Row is a patented system that inexpensively
for a variety of inlet and outlet configurations. Contact captures total suspended solids(TSS) and debris and
the StormTech Technical Services Department or your provides easy access for inspection and maintenance.
local StormTech representative for assistance configur- A double layer of woven geotextile between the bottom
ing inlet and outlet connections. of the chambers and the foundation stone provides the
The open graded stone around and under the MC-3500 filter media that satisfies most contaminant removal objec-
rovides si nificant conve ance ca acit ran in from tives. Each installed MC-3500 chamber and MC-3500
p g y p y g 9 end cap provides 43.2 ft2(4.0 mz) and 7.5 ft2(0.7 m2) of
approximately 0.8 cfs (23 I/s)to 13 cfs(368 IIs)per bottom filter area respectively. Flow through Isolator Row
chamber. The actual conveyance capacity is dependent chamber and end cap joints is filtered by a nonwoven
upon stone size, depth of foundation stone and head of geotextile that covers the chambers and end caps.
water. Although the high conveyance capacity of the
open graded stone is an important component of the The Isolator Row can be configured for maintenance
flow network, StormTech recommends that a system of objectives or, in some regulatory jurisdictions, for water
inlet and outlet manifolds be designed to distribute and quality objectives. For water quality applications,
convey the peak flow through the chamber system. Isolator Rows can be sized based on water quality
it is the responsibility of the design engineer to provide
volume or flow rate.
the design flow rates and storage volumes for the All Isolator Rows require: 1) a manhole for maintenance
stormwater system and to ensure that the final design access, 2)a means of diversion of flows to the Isolator
meets all conveyance and storage requirements. Row and 3)a high flow bypass. Flow diversion can be
However, StormTech will work with the design engineer accomplished by either a weir in the upstream access
to assist with manifold and chamber layouts that meet manhole or simply by feeding the Isolator Row at a
the design objectives. lower elevation than the high flow bypass. Contact
StormTech for assistance sizing Isolator Rows.
When additional stormwater treatment is required,
StormTech systems can be configured using a treatment
train approach where other stormwater BMPs are located
in series.
Fi ure 7—StormTech IsolatorTM'Row Detail COVER ENTIRE ROW WITH AASHTO M288
g —CLASS 2 NON-WOVEN GEOTEXTILE STORMTECH
� � MC-3500—12.5'(3.81 m)WIDE STRIP END CAP �
.. - .1 l:
: • . � .
i , , � . .
ICATCH BASIN J� ``���i � �i\ r, `,�\ ���, �i�� �� `�� \ ;O ��� � �� ,J l O \,,, 1��,\11 ti�� �1't'11��
IOR � � � � � � , , � � � �
�, MANHOLE
i � r �
�,
I ;\ �
, �,, � �i�� ,
�; �
I � � � 1� �
� SUMP DEPTH � �`
I TBD BY DESIGN I{�I�II- 31�111�1�111�1 iHl�ll�\
I�II-1 �''� =1 I�IL=J1�1 �IT=1�1` '� p�qYERS OF AASHTO M288 CLASS 1
ENGINEER I��� �' p4"(600mm)HDPEACCESS ��������� �����F�r �WOVENGEOTEXTILE,BETWEEN
� Ik�l�' PIPE REQUIRED.USE FACTORY - =11I I I'�I�" FOUNDATION STONE AND CHAMBERS
�r PRE-CORED END CAPS. ~� MC-3500—825'(2.51 m)WIDE STRIPS
.,� _. �7_ !,.•7r^e��a;3,�-,>R�,��7J$ f;fia r:�Ct� ..«3�a .sp��T-.. :1�� ;.�� _'�� ,t,s_ _ �'�� ., ��"�'.'hF.'?"S..?n i'p �-� . ._ ' '. _ ''�. t-,tc'!j . . . ..
Call StormTech at 860.529.8188 or 888.892.2694 or visit our�h�eosite at www.stormtech.com for technical and product information 8
� =�:
Figure 8—Typicai Inlet Configuration With Isolator Row and TABLE 4—Allowable Inlet Flows With 15' (4.57 m)of Scour
Scour Protection Protection for the MC-3500 Chamber
•� '"�'�- :�`�= �.,. � , "�-�*� x
/� OPTIONPLPP.E-TAEATh7ENT � �::..���. ��___ � �:-� *-3��-'�, :
� r�
/ i- 24'(600 mml DW.ACCESS '?"'�. . ��"� ��"•+�`�
������0 12(300) 2(57)
� -- -- - --- - --
l �so°,A°r�Moi;Ro,ro --- 15(375) 3.5(99) -- _—
�� �/ 18(450) 5.5(156)
STRUCTUREWITHOVEPROWWEIii ' -.___. _____ - � ___-___-__-_.________-_.
(48"(1200 mml MIN.CIA.WfTH 26'(610 mm) ( . , 24(600) - 8.5(241)
` ------ - _ ----- - - ---
SUMP RECOMMENOED FOP AGCESS) � - �----� � ---
i
�,�,��ativ,�„Fo,� 4.4 OUTLET MANiFOIDS
� The primary function of the outlet manifoid is to convey
aasr+ro t�n2ea cwss i wovEN �
! peak flows from the chamber system to the outlet control
�wTocr��c�R Fa,Noa„or,� structure. Outlet manifolds are often sized for attenuated
sror�E FOR scouR�+o�cnoN
HT.�=cH�ti,r�R�N��-rPows � `+ flows. They may be smaller in diameter and have fewer
row connections than inlet manifolds. In some applica-
tions however, the intent of the outlet piping is to convey
;o;6m��'3�s� ''_;To�,,,,,;E�H an unattenuated bypass flow rate and manifolds may be
c"""'BE`�s sized similar to inlet manifolds.
4.3 INLET MANIFOLDS Since chambers are generally flowing at or near full at
The primary function of the inlet manifold is to convey the time of the peak outlet flow rate, scour is generally
and distribute flows to a sufficient number of rows in not governing and outlet manifold sizing is based on
the chamber bed such that there is ample conveyance pipe flow equations. In most cases, StormTech recom-
capacity to pass the peak flows without creating an mends that outlet manifolds connect the same rows that
unacceptable backwater condition in upstream piping are connected to an inlet manifold. This provides a con-
or scour the foundation stone under the chambers. tinuous flow path through open conduits to pass the
Manifolds are connected to MC-3500 end caps either at peak flow without dependence on passing peak flows
the top or bottom of the end cap. High inlet flow rates through stone.
from either connection location produce a shear scour The primary function of the underdrains is to draw down
potential of the foundation stone. Inlet flows from top Water stored in the stone below the invert of the manifold.
inlets also produce impingement scour potential. Scour Underdrains are generally not sized for conveyance of
potentiaf is reduced when standing water is present over the peak flow.
the foundation stone. However, for safe design across
the wide range of applications, StormTech assumes min-
imal standing water at the time the design flow occurs. Figure 9-Typical Inlet, Outiet and Underdrain Configuration
To minimize scour potential, StormTech recommends the
installation of woven scour protection fabric at each inlet eEo
I PERIMETER
row. This enables a protected transition zone from the STORMTECH
concentrated flow coming out of the inlet pipe to a uni- cHnMeERs
form flow across the entire width of the chamber for both
top and bottom connections.
Allowable flow rates for design are dependent upon:
the elevation of inlet pipe, foundation stone size and
scour protection. With an appropriate scour protection iN��
geotextile installed from the end cap to at least 15� MANIFOLD
our��
(4.57 m) in front of the inlet pipe, for both top and MANIFOLD
bottom feeds, the flow rates listed in Table 4 can be used
for ail StormTech specified foundation stone gradations.
SCOUR NUMBER AND SIZE
PROTECTION OF UNOERDRAW(S) ��
PER ENGINEEA'S
OESIGN
OUTLEf CONTROL STRUCTURE
(PER ENGINEER'S DESIGWPROVIDED BY OTHERSj
, _ _ — -- _ .. __ ._ ___. _ _ _ __ .__.. _ _ _,__ ,-- ___ _ _ _ ._. ._ _ _ _.._ _.
9 Call StormTech at 860.529.8188 oF 888.892.2694 or visit our website at www.stormtech.com for technica�ard product informa?ion.
��� ����������� �����_� : ���� .. StormTech�
Tables 5 and 6 provide cumulative storage volumes for be input for quick cumulative storage calculations are
the MC-3500 chamber and end cap. These tables can available at www.stormtech.com. For assistance with
be used to calculate the stage-storage relationship for site-specific calculations or input into routing software,
the retention or detention system. Digital spreadsheets contact the StormTech Technical Services Department.
in which the number of chambers and end caps can
TABLE 5-MC-3500 Incremenial Storage Volume Per Chamber
Assumes 40%stone porosity. Calculations are based upon a 9"(229 mm)stone base under the chambers, 72"(305 mm)
of stone above chambers, and 6'(152 mm)spacing between chambers.
` � `����� �`� _ �{ e
� F _:s !.- � � " ': r
�- s.:� f ��' s :t .� %'� , _
�� �� � pi �_- ' � }i _
� � _ �'-4 �� �
.. �' .��t� �-, �� -- _��� :`^-e'�'��' �
�,
� . .
. „�
�"' ,�� � ��. �., � .. . , - ����-�s€�:, =
�,
_X. .,- :�..; . -.-. .'`-. . ,' _ .,. _. .�-. �:.''-?;
, . ;:., __.,._e_�- . _��._;r�. . v_ _�::. ... . .. , _
;_ 66(1676) _ _ 0 176.88(5.009)___ --- 32�813) _ -- 74_54(2_111) __ 97.60(2.764)-
: 65(1651) T�--- 0 --� 175.22 4.962�__- -__31_(787) 71.71 (2 031�_ _ 94.25(2.669)-_
� 64(1626)-_ ;Stone 0 ; 173.57(4.915�__ - 30(762) _ 68.83(1.949)_ __-_ 90.8�573)_
-- - --- - -
- _63(1600�__ Cover --- 0 '__ 171.92 4.868) ____ 29(737) _ 65.89(1 8661_-_-_ 87.45(2.476)
_ 62(1575)__ _-- 0 '--- 170.27 4.821)--_ -- 28(711�_ 62.91 (1.782�_____-84.01�2.379) -
�, '; ; 61 (1549Z __ 0 �__168.61 (4.775�- - -- _27�686�__ _ 59_89(1.6� - -_- 80.55 2281) _
'=-_60(1524)_ 0 ' 166.96(4.72� -- 26�660)-- 56.82(1.60�9 ___ 77.05 2.182�
-- ' --- - - _
^__59�1499) _- �-_165.31 �.681�- _- -_ 25�635) 53.72{1.521) - __ 73.54�.082j_
r__-58�1473)_ _ 0� - 163.66 4.634) _, _ __24(610) 50.57(1.432) -___ 70.00 1.982)
; ! 57�448�_ __0 � 162.01�4.588) 23(584) 47 39(1 342)_ _ _ 66.44 1.881�
-- - --- - -
_ - 56�1422) ---� 160.35(4.541) -- -_22(559) 4418(1 251)__ _ 62_86(L780)
._ __55(1397� ____ .0��_ 15870(4.494)_ � _21 �33) 40.93(1_159)__- _ 59.26 1.678) _
_-54(1372� __-_113.04(3.201)--___ 157.05(4.447)__ `-_ 20(508)-_ _ 37.66(1.Q6�-_ --55.64(1.576)__
� 53(1346)_ _ __11298 3.199�--_ -- 155.36(4.399�_- ; _ 19(483) _ 34.35(0.97�--_ _ 52.01 (1,473)_
; --
; _ 52(1321)_- - 112.78�3_194)__ 153.59 L.349}__ ;-_ 18(457) __ 31.02(0.878�- _ __-- 48_35�1_369)
, __-__51_�1295) _ 112.47 3.185) _ 151.75(4.297)___ ___ 17�432�- 27.66(0.783�__ _---44.69(1.265�
' I 50(1270)_ __ -111.86(3.168 __149.73�4.240) -___-16(406) _ - 24.28(0.688 ___ 41.00�.16�-
!r-- 49(1245� _____110.89�140) -_ _147.50(4,177�� �_ _15(381)- _- 20.87(0.591 -__ 37.31 (1.05�__
�-
; 48(1219)_-____--109.68�10�_ _ 145.12(4.109�-__-, ,--_ 14(356)-__ __ 17.45(0.494) _ _ 33.60(0_951) _
� 47(1194) 108.29(3.066) 142.64(4.039) ! ` 13(330) 14.00(0.396) ' __ __ 29.88_(0.846) _
-- -- - -- - - -
; 46(1168) --106 75(3.023)_- -140.06(3.966) : �_ 12(305) _ 10_53(0.298� _ 26.15(0740)
45(1143) _--_--105.07�975) _ 137.39(3.891) _- ,_ 11 (279) _ ___ 7.04(0.199�----- 22.40(0_634)__
�_44(1118� __ -_-103_26�_924 _-- 134 66�3_813)__- `_- 10(254)__ __ __ 3.53(0.100) __�_ 18.64�0_528�__
__43(1092) __-_ - 101.33 2.869� _- 131.85(3.734�--_ �_ _9�229) - -_0 __ 14.87(0_421)
�- 42(1067)__ __ _ 99.31 �12)_ -_ 128.98(3.652)_-, ;- -_ S(203)-- _ _ 0 ' -- 13.22�0_374� _
-- - - - - -
_ :---41 (1041)-__ -_ 97.18�2_752)_-_ _-126.05(3.569) _, ; -__ 7(178)_ _ __ _0 __- 11.57(0.328)
40(101�_ _ _- 94.97(2._689�-- _ _- 123_Ol(3_485) -; _-_- 6(152) _ Stone_- 0 __ -_- 9.91 (0.281) _
;�_ 39(99�_ - _ 92.6�2_624)-_ __120.04(3.3991 - �_ 5(127)_ _ Foundation-- -p_ _ !_---8 26(0.234)_
--_38(965)-- _ 90.28 2.556) _-__-116.96(3 312) ._ : 4(102) _ _- __0- -�--_ 6.61 (0_187)
. � 37(940�__ -_ 87 82�.487)_-- 113.83(3.223) 3�76)- �__ 0-- , 4 96�0_140
�-- -- - -- _
-- 36(914)__ _ 85 30(2415�--_ 110 66(3.134) _ - _- 2(51)_ 0_ __3 30_�0.094� _
- --
':� -__ 35(889)____ _ 82.70 i2.342)__ - 107.45(3 043) __ 1 (25j 0 ' 1.65(0.047)
_ _ _ _ ------
; 34(864� ---_ 80.04_L267) _ 104.20(2,951)__
' I 33(838) 77.32(2.189) 100.92(2.858)
I�Y.4. . .. ., . ._ , . _, � _ (� _.. v . _, t;_ ..
,.. . _ ' _ '. . :'L. :r ... , . .' .�:�I"� ,+.
' __...z�______ _ _. __..__ ..__._..�.___ _..._.----.__ .. _ __, .._�_�___.__._ _ ---- __ _ _ _... _ _ _ .
Call StormTech at 8fi0.529.8188 or 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 10
�.Q �� ������� ���r�g� �'������ �
TABLE 6-MC-3500 Incremental Storage Volume Per End Cap
Assumes 40% stone porosiry. Calculations are based upon a 9"(229 mm)stone base under the end caps, 12"(305 mm)
of stone above end caps, 6"(152 mm)of spacing between end caps and 6"(152 mm)of stone perimeter.
� ; .. �_ � _ - ����'�� ��-�$ -
� � � _ � s �{�, � , ����
�,. �z�'-� 3 h s�s��3`�`� _Y �.�� .. ��'���� � �. y -
� ,e.k �,�•f � � � "�. 4t-'c�e,.y�y "a���- � �',`
�� ��� 'Y�'" c �`�}� '�.'�.`�-�� -- � :s S
3-s-,�"3.� �;: a�a, ; =�;�.�x � >�--`s �: - rT.""���
-� ��"_ _�'' �:" �I _=� ..���' �_ e.» . . _. . - ,
_.��.'. --s -.., a.,� a _�-� ,_:-:,. .-. ... . � J. �....� . .. .
66�676�_ 0_ ___45 65�1.293�__ _ 33(838� _ __ 1253(0.355) 25 65�0.726) ;
- - - - -- -
__ 65(165� _-� _ __-0 � _45.10�.277L^ `_ 32�813�-_-- : 12.18�0.345�_ - _24.89�0.705 __
64�1626� Stone _ 0 ;_ 44.55�.262�_� ;___31�78�__ _11 81 (0.335� 24.12(0.6�
_ 63 1600� Cover ___�_ 44.00�1.246�� __ 30(76�_� 11.42(0.323� 23.34(0.661� _
62 L575� 0� 43.45(L230�' 29 737�; 11.01�0,312L_ _ 22.54�0.638) _
� - - - -
61 �1549�- - _ __ 0 � 42.90�_215) , 28�711) _-_ 10.58�0.30�--- 21.73�0.615 _--
� -
_ 60�524�____- __0� 42 35(1.1991 -J _- 27(6�-_-_-_-10_13�287)- _ 20.92�0.592�-J
59�1499�_ _ 0_� 41.80 L184�_-- 26_�680�---------- 9_67�0.274� - - 20.09�0_56�__,
_ _--
58�1473) _ __ 0 i _41.25�_168L_j 25(610�_- ----_9.19�0.260)- _19.25_0.545�-__
_57�1448� 0 � 4070�.153)-_-'. ---_- -24�6�----_-_--8.70�.246�____ 18.41 �0.521�_ _;
--56 L422� _ - 0_� 40.15�1.137) _-' _- -23�584�_______ __8.19�0.2�__ - 17_55�9�-_
55(1397)__ __._____0_= 39.61 1.122�_-- _- 22�55�-__ --__ -7.67�0.217) _ _ 16_69�0.47�=
--54(1372) _ 15.64(0.443�_-- 39•06(1.106�_-- ',_ 21 �5331--____ --_ 7.13�0.202)_- 15.82_�0.448� '
,__ 53�1346) 15.64�0.443)_- _-38.51�1.090�_- ;-- 20�508�___ --__6.59�0.187� 14.94�0.4�_
' , _-- 52�1321) 15.63(0.443�_-__ 37 95�1.075Z _ ^_19(483)_ -- _____6.03(0.171) _ 14.06(0.398 __
'__'', -_51�1295) ___ 15.62(0.442�---_37.40�1.059� -- �_ 18(457� -_- _ _ 5.46(0.155) ___ 13.17�0.37�--
I 50(1270�_ - _-- 15.60(0.442�_ 36.84(1.043�-_ � 17(432� __-_--__4.88(0.1�_ _ -_12.27�0.347--_-
---
_ 49�12451 __ T 15.56(0.441� _36 26�1.027L- 16(406) -- _:-_----4.30(0.122)__ __11.37(0.322�--
' ; 4811219) -_- _ 15.51 (0.439) -35.68�1.0101 - �--- 15(381�_ _ _---_3.70(0.105� 10.46(0_296�_-
`---47(1194)_ ___-- _ 15.44(0.437) __ 35.09(0.994�_ -- ---14(356�-_ _ , 3.10(0.088� _ 9,55�.270�--
46(1168)_ _--_ 15.35(0.435) __ 34.49(0.977) - ^_-13(330�_--- -_ 2.49(0.071) 8.64(0_24� _
-- _
' 45(1143) ____ 15.25(0.432Z_--- 33.88�0.959)-_- �__ 12�3051 ---- -1.88(0.053) 7.72(0.2191---
'`_ 44�118) _-__ 15.13(OA28) -33.26�0.942� --- ---_11_(279�_ 1.26(0.036� 6.80�0,192) _;
_ ___
-_ 43�092)- -- _ 14.99(0.424� 32.62(0.924_-'. 10 254 --_ __0.63 S0 018)___ _ 5.87�0.166) _
__.___ � � 1
42�1067� _ __ 14.83(0.420) __ _ 31.98(0.905�-- , 9�229�---_ _ __0 4.95(0.140�__
---
--41�1041�___ _! _ 14.65(0.415)___ 31.32�0.887L-- ; 8�203) -_! _ - _ 0_�- _ 4.40(0.124) _.
• 40�1016� ;__ 14.45�0.409) _- _ 30.65�0.868�_ _ ; 7�1-7�--_-- _ _ 0 : 3.85(0.10� _i
---- 39_�991� -_- 1424(0.403�_--29.97�0.849)__ ;-- 6(152Z-__- _ ___ 0 _ 3.30 50.093 _-
� ---38�965) _' - 14.00(0.396�_-- 29.28(0.829)--- ''.--5_�127�-- Stone ______--� _-- 275(0.07�_____
-- -37�9481_- ____- 13.74(0.389�_ -____28.58(0.809L-_- �--4�10� ;Foundation - - 0 ;__ 2.20_�0.062�-_-
_ _ 36(91� ---- 13.47(0.381�-- -27 86(0_789�- ;-----3�7�--- -- ----0 - _ 1.65�0_047�--
-- _35�889)_ __ 13.18(0_373�----27.14�0.769)- - ' ---2(51�___ 0 - --1.1��0.031�--
34(864) 12.86(0.364) 26.40(0.748) 1 (25) _�0__; 0.55(0.016)
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' _ - __ _ __. __ ._ . _ ___ . __ .__.......... . . ... .�__.._
11 Calt StormTech at 860.529.8188 or 888.892.2694 or visit our website at www.stormtech.com for technical and product information.
���� � �., �_ ���3 ���� ������� StormTech�
The following steps provide the calculations necessary 6)Determine the required bed size(S).
for preliminary sizing of an MC-3500 chamber system. The size of the bed will depend on the number of
For custom bed configurations to fit specific sites, con- chambers and end caps required:
tact the StormTech Technical Services Department or MC-3500 area per chamber=49.6 ft2(4.6 rr�)
your local StormTech representative. MC-3500 area per end cap= 13.0 ft2(1.2 rr�
1)Determine the amount of storage volume(V� S= (C x area per chamber1+ (EC x area per end cap)
required. It is the design engineer's sole responsibility to NOTE.�ft is necessary to add 12"(305 mm)of stone perimeter paralle!
determine the storage volume required. to the chamber rows and 6"(i52 mm)of stone perimefer from the
TABLE 7-Storage Volume Per Chamber/End Cap ft'(m') base of al!end caps. The additiona!area due to perimeter stone rs nof
Bare Chamber/End Cap and Stone included in the area numbers above.
Unit Volume-Stone Foundatian 7�petermine the amount of stone(V�required.
' Siora e De th in. mm
--------- -----J To calculate the total amount of clean, crushed, angular
9 P
MC-3500 ' ft'(m') 9(229) 12�305) 15(381) 18(457) I stone required, multiply the number of chambers (C)
- ---- - - ---- - .___ -----
', Chamber '113(320) 176.8(5.01)181.8(5.15)186.8(5.29)191.7(5.43)! and the number of end caps(EC) by the selected
` --- -- ----- ----- --- ----- weight of stone from Table 8.
, End Cap '15.6(0.44) 45.6(1.29) 47.3(1.34) 48.9(1.39) 50.6(1.43)'
NOTE.�Assumes 40%porosity for the stone plus the chambedend cap NOTf:Clean,crushed,angular stone is also required around the
volume.End cap volume assumes 6"(i52 mm)stone perimeter. Perimeter oi the system.
2)Determine the number of chambers(C)required. TABLE 8-Amount of Stone Per Chamber/End Cap
- -- - - - --- --- -_ ___
To calculate the number of chambers required for Stone Foundation Depth
ENGLISH --- - _ --
adequate storage, divide the storage volume(Vs) tons(yds°) 9" 17' 15" 18"
by the storage volume of the chamber(from Table 7), as - ------- - -�-- - - --
MC-3500 8.4(5.9 yd') 9.0(6.4 yd3) _ 9.7(6.8 ytl') 10.3(7.3 yd3)
follows: C=Vs/Storage Volume per Chamber - - ---------r_-____-_------_-- ---
End Cap ' 3.9(2.8 yd') 4.2(2.9 yd') 4.4(3.1 yd') 4.6(3.2 yd')
3)Determine the number of end ca s ' ------3 -- - _ _----- -_. _ -- -
p ''�1u"'�• ' M�Ric k9�m� 229 mm 305 mm 381 mm 457 mm
The number of end caps (EC)required depends on the MC-3500 7620(4.5 m') 8164(4.9 m') 8800(52 m') 9344(5.6 m')
number of rows required by the project. Once the num- -- --- ------- ----- ----
- ---
ber of chamber rows is determined, multiply the number ; End Cap _3538(2.1 m') 3810(2.2 m') 3992(2.4 m') 4173(2.4 m')'
----------__ __ --
of chamber rows by 2 to determine the number of end NOTE.�Assumes f2"(305 mm)of stone above,6"(152 mmJ row
caps required. EC= No. of Chamber Rows x 2 spacing,and 6"(152 mm)of perimeter stone in front of end caps.
NOTE.�Additiona!end caps may be required for systems having inlef 8)Determine the votume of excavation(Ex)required.
locations withinthechamberbed. Each additional foot of cover will add a volume of exca-
vation of 1.8 yd'(1.4 m�) per MC-3500 chamber and
4)Detemiine additional storage provided by end caps. 0.6 yd3(0.5 m3) per MC-3500 end cap.
End Caps will provide additional storage to the projec[.
Multiply the number of end caps(EC) by the storage TABLE 9-Volume of Excavation Per ChambedEnd Cap in yd'(m')
volume per end cap(ECs)to determine the additional Stone Foundation Depth
storage (As) provided by the end caps. As= EC x ECs '9"(229 mm) 12"(305 mm)15"(381 mm)18"(457 mm),
5)Adjust number of chambers(C)to accourrt for addi- MC-3500 ' 11.9(9.1) _ 12.4(9 5) I 12.9(9.9) 13.3(10.2) I
tional end cap storage(As).The original number of cham- End Cap , 4.0(3.1) 4.1 (3.1) ', 4.3(3.3) 4.4(3.4)
-- -- -- - - - - _.
bers(C)can now be reduced due to the additional stor- NOTE:Assumes 6"(152 mm)of separation between chamber rows,6'
age in the end caps. Divide the additional storage(As) (�52 mmJ of perimeter in front of end caps,and 24"(610 mm)01
by the storage volume per chamber to determine the cover. The volume ofexcava6on wi!!varyas the depth olcoverincreases.
number of chambers that can be removed. Nurnber of
chambers to rerrw�e=As/volume per chamber 9)Deterrnine the area of geote�ctile{F�required.
NOTE.�Additiona/storage exists in the stone perimeteras well as in fhe The bottom, top and sides of the bed must be covered
inletand outlet maniiold sysfems. Contact StormTech's 7echnical W�th a non-woven geotextile (filter fabric) that meets
Services Department forassistance with determining the number of AASHTO M288 Class 2 requirements. The area of the
chambers and end caps required for your project. sidewalls must be calculated and a 24"(610 mm)over-
lap must be included for all seams. Geotext7es typically
come in 15 foot(4.57 m)wide rolls.
' � _ _�__-6 __ _ __ _ _ _____ �.___ _., .__ _ __ __--__ _- _ ___.� ___.._ - - __._ _ - -
Call StormTech a;860.529.6188 or 888.892.2694 or visit our website at www.stormtech.com for technlcal and product information. 12
�� �� ������ � �� ������ �� ������ ������
Figure 10—MC-3500 Structural Cross Section Detail—(not to scale)
CHAMBERS SMALL COIJFORM TO THE ftEQU1REMENiS OF ASTh1 F 2�81
CHAMBERS SHALL MEET ASTM F 261 B'STANOARD —'STANDARD PRACTICE FOR STRUCTURAL DESIGN OF 7HERMOPIASTIC
SPEGIFlCATION FOR PO�YP0.0PYLENE(PP).� � CARRUGATFD WAIl STORMWA7ER COLLECTION CHM7BERS'.
CORRUGA7ED WALLSTORMWATER COLLEC710NCIiM6ER5. �
GRANUTAR WELL-GRAOED SOIUAGGREGATE MIXTURES.
MG3SODLHAGBER� ,,� �� _45°GFINES.COMFACTIN17�305mm)MAXUFTST095%
STANDARO PROCTOR DENSfTV.SEE THE TPBLE OF
NOMINALY.-21NCM(79-51mm)CLEAN, 1,` ' ,� ACCEPTABLEFILLAIATERWLS.
� CRUSHED.ANGULAR EMBEDMEM STONE— '1 /
J PAVEMENT DESIGN(PER
� NOKWOVENGEOTE%TILE/LLL 11� I l;I j� ENGINEER'SDRAWINGS)
' ARWNDANGULARSTONE� •, 1 �� � �
I
1 r
f �4� � �
�� �,����f � I I I I-� �i,'� � �� ..� �� y ; -ro ensE as nFweiE a�vo�rr_ �
� � I�"�'i - I I� � ij �� � ' �" Y i FORlRIF11VEGINSTKUT10K4.W11ERF ��1 }
, I �_tJF . � IC�I-11'��-� {�/� — � 'J,r��, �� .� � � %� ' avrnrvcma.�w��esearaccua. _ �,.�� 2�'f610mm)6.5'�M1�mJ
rJcaEnsE covEn ro 3m Rsz mml.
', �1-1 - �I I � �"�' 13'I�Srtun�MlN'
,. I � . � � II-' � I�II .�. 7 <. " .._ MIN.
� ,_ ���' � �- .��-. �� 11� �-;��� �' ���
r� �� � I �, ; , � ,
� - �
I�� 11 i .Q ��: ll.l..11- �% 1 C9:� ���`1. C3 '. ��CJ C� �` 4S(1743mm)
4� %. �' 6'MIN I� � � .�-� �' � :; � , : ��,� � Mcasoo
. , (152 mm);; L � . I� i .. � �,� y
F- ii t I i �_ �1 � ���L 1
{ � � --�� FOUNOATION STONE
� � - � ��=i l. ' .�'�?.� l. " 9'f229 mm)MIN.
I � r
—I 1 I - r
i-1�,�1 i � ' -_ �y - � I� L:_' �I - � li_I � �G _ _ i i=' _i�'
u'J � � _
SUBGRADE SOILS�� 6"�152 mm�MIN. � 7T(1956 mm) ir(305 mm)MIN.
�MG35W END CAP—
THE INSTALLED CINMBER SVSTEM SWLLL PROVIDE TME LOAD FACTIXtS SPECIFlED IN THE AASMO LRfD BRIOGE�ESIGN SPECIFICATIONS
SECTION 72.72 FOR€ARTN ANO LIVE LOADS,WITM CONSIDERATION FOR IMPACT AND MULTWLE VEHICLE PRESENCES.
MC-3500 STORMWATER CHAMBER SPECIFICATIONS' 6. Chambers shall conform to the requirements of
� ASTM F 2787, "Standard Practice for Structural
1. Chambers shall be StormTech MC-3500 or Design of Thermoplastic Corrugated Wall
approved equal. Stormwater Collection Chambers."
2. Chambers shall be made from virgin, impact- 7. Only chambers that are approved by the engineer
modified polypropylene copolymers. will be ailowed. The contractor shall submit(3 sets)
of the following to the engineer for approval before
3. Chamber rows shall provide continuous, unobstructed delivering chambers to the project site:
internal space with no internal panels that would
impede flow. • A structural evaluation by a registered structurai
engineer that demonstrates that the load factors
4. The structural design of the chambers, the structural specified in the AASHTO LRFD Bridge Design
__ backfill and the instailation requirements shall ensure Specifications, Section 12.12 are met. The 50-
that the load factors specified in the AASHTO LRFD year creep modulus data specified in ASTM F
I� Bridge Design Specifications, Section 12.12 are met 2418 must be used as part of the AASHTO
for: 1)long-duration dead loads and 2)short-duration structural evaluation to verify long-term
live loads, based on the AASHTO Design Truck performance
with consideration for impact and multiple vehicle
presences. • Structural cross section detail on which the
structural cross section is based.
5. Chambers shall conform to the requirements of
ASTM F 2418, "Standard Specification for $. The installation of chambers shall be in accordance
Polypropylene(PP)Corrugated Wall Stormwater with the manufacturer's latest Installation Instructions.
Collection Chambers."
Detai!drawings available in AutoCad Rev.2000 format at www.stormtech.com.
, __ ._ __._ . _ _— __ _ ___--- --�_.__ -_ ..._ ,___. __ _ ___--___.._�. ____ ____.e_..__�_____ , ._._--_ _--__ .__ ._
13 Call StormTech at 860.529.8188 or 888.892.2694 or visit our website at www.stormtech.com for technical and product information.
�
�.'-,
�`�
� -
� ��� ����� StormTech°
1. StormTech LLC ("StormTech") requires installing 6. Stone placement betweer+ chamber rows and
contractors to use and understand the latest around perimeter must follow instructions as
StormTech MC-3500 Installation Ins�tructions prior indicated in the most current version of StormTech
to beginning system installation. MC-3500 Installation Instructions.
2. StormTech offers insta�lation consultations to 7. Backfilling over the chambers must follow require-
installing contractors. Contact our Technical ments as indicated in the most current version of
Service Department or local StormTech represen- StormTech MC-3500 Installation Instructions.
tative at least 30 days prior to system installation
to arrange a pre-installation consultation. Our 8� The contractor must refer to StormTech MC-3500
representatives can then answer questions or Installation Instructions for a Table of Acceptable
address comments on the StormTech chamber Vehicle Loads at various depths of cover. This
system and inform the Installing contractor of the information is also available at the StormTech
minimum installation requirements before begin- website: www.stormtech.com. The contractor is
ning the system's construction. Call 860-529-8188 responsible for preventing vehicles that exceed
to speak to a Technical Service Representative or StormTech requirements from traveling across or
visit www.stormtech.com to receive a copy of our parking over the stormwater system. Temporary
Installation Instructions. fencing, warning tape and appropriately located
signs are commoniy used to prevent unauthorized
3. StormTech requirements for systems with pavement vehicles from entering sensitive construction areas.
design (asphalt, concrete pavers, etc.): Minimum
cover is 24' (610 mm) not including pavement; 9 The contractor must apply erosion and sediment
Maximum cover is 6.5' (1.98 m)including pavement. control measures to protect the stormwater system
For installations that do not include pavement, during all phases of site construction per Iocai
where rutting from vehicles may occur, minimum codes and design engineer's specifications.
required cover is 30' (762 mm), maximum cover is 10. STORMTECH PRODUCT WARRANTY IS LIMITED.
6.5' (1.98 m). Contact StormTech for warranty information.
4. The contractor must report any discrepancies with
the bearing capacity of the subgrade materials to
the design engineer.
5. AASHTO M288 Class 2 non-woven geotextile
(filter fabric) must be used as indicated in the
" project plans.
Ii ;
��
'; i
, Call StormTech at 860.529.8188 or 888.892.2684 or visit our website at www.stormtech.com for technical and product information. 14
��
� ������ �� �������� � s=� �_4 y,� 3_. - -
���������� ��������: �� � _ _ _ � �
• MC-3500 Chambers and End Caps • In-House System Layout Assistance
• SC-310 Chambers and End Caps • On-Site Educational Seminars
-- • SG740 Chambers and End Caps • Worldwide Technical Sales Group
• SC and MC Fabricated End Caps • Centralized Product Applications Department
• Fabricated Manifold Fittings • Research and Development Team
• Patented Isolator Row for Maintenance and Water Quality • Technical Literature, 0&M Manuals and Detailed
• Chamber Separation Spacers CAD drawings all downloadable via our Web Site
, , , , - � � � „ , � •, , , � � � . , ,
� � � � � � � � �� . � � � � � � � � �� r ,
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Please contact one of our inside project application professionals or Regional Product Managers(RPMs)to discuss your particular
application.A wide variety of technical support material is available in print,electronic media or from our website at www.stormtech.com.
For any questions, please call StormTech at 888-892-2694.
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Det2rtion•Retention�Recharge
— Subsurface Stormwater Management`"
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20 Beaver Road,Suite 104! Wethersfield ' Connecticut j 06109
860.529.8188! 888.892.2694� fax 866.328.8401 i fax 860.529.8040 'www.stormtech.com
www.stormtech.com
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StormTech products are covered by one or more of the following paients: U.S.Patents:5,401,459;5,511,903;5,716,163;5,588,778;5,839,844; I��I
' Canadian Patents:2,158,418 Other U.S.and Foreign Patents Pending ill
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Printed in U.S.A. OO Copyright.All rights reserved.StormTech LLC.2009 S171009 ,
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Sut�surtace Stnrrnvvafer Managerz�ent"
Thermoptastic Liners fQr Defiention Systems Te�n sneet# 2
Rev. 1/16/06
General:
StormTech chambers offer the distinct advantage and versatility that allow them to be
designed as an open bottom detention or retenfion system. In fact the vast majority of ,
StormTech installations and designs are open boftom detention systems. Using an open
bottom system enables treatment of the storm water through the underlying soils and pro�ides a
volume safety factor based on the infiltrative capacity of the underlying soils.
In some applications, however, open bottom detention systems may not be allowed. This
memo provides guidance for the design and installation of thermoplastic liners for detention
systems using StormTech chambers. The major points of the memo are:
• Infiltration of stormwater is generally a desirable stormwater management practice, often
required by regulations. Lined systems should only be specified where unique site
conditions preclude significant infiltration.
• Thermoplastic liners provide cost effective and viable means to contain stormwater in
StormTech subsurface systems where infiltration is undesirable.
• PVC and LLDPE are the most cost effecti�e, installed membrane materials.
• Enhanced puncture resistance from angular aggregate on the water side and from
j protrusions on the soil side can be achieved by placing a non-woven geotextile
reinforcement on each side of the geomembrane. A sand underlayment in lieu of the
geotextile reinforcement on the soil side may be considered when cost effective.
• StormTech does not design, fabricate, sell or install thermoplastic liners. StormTech
recommends consulting with liner professionals for final design and installation advice.
Membrane Materials:
Polyviny! chloride (PVC) is an effective liner material for StormTech systems. PVC
offers good chemical resistance to contaminant concentrations typical of highway runoff and to
chlorides from road salting applications. Non-reinforced 30 mil PVC liners are recommended for
� StormTech systems. PVC is flexible. t can be folded without damage and is typically
prefabricated and shipped to the jobsite. Panels as large as 20,000 sqft can be prefabricated
into a 4000 Ib panel (30 mil is 0.195 Ibs/sqft, SG = 1.2). PVC has the versatility to be field
solvent welded, taped or field heat welded. A very significant advantage of PVC is that an
excavation contractor can install a PVC liner without specialty crews. Solvent welding of seams,
patches and pipe boots can all be done by the excavation contractor making PVC the lowest
cost liner alternative.
The PVC compound includes fillers and plasticizers to reduce cost and UV inhibitors to
e�end the service life under exposure to sunlight. Under prolonged sunlight exposures such as
in a permanent surface pool, these additives can leach into the pool and reach concentrations
,
Page 2 of 6
Tech Sheet#2
Rev. 1/16/06
harmful to aquatic life. �PVC compounds referred to as "fish safe" are sometimes used for surface pond
liners and may be considered for StormTech liners. However, since StormTech systems are subsurface,
there is no opportunity for UV attack by sunlight. Also since stormwater is detained for short durations,
typically 48 hours or less, there is little opportunity for accumulation of leachates. Therefore PVC is an
excellent membrane material for thermoplastic liner detention systems.
�Recommended Confrquration: 30 mil PVC with 8 ounce non-wo�en reinforcement fabric underlayment
and overlayment, open top with hiqh flow bvpass�
Recommended Restriction: Do not use for fuel spill containment.
_ ' Linear low density polyethylene (LLDPE) is a very inert material that offers excellent chemical
resistance and is "fish safe". LLDPE is an effective liner system for StormTech systems, particularly for
small projects where the entire liner can be prefabricated in one piece or when using taped seams.
LLDPE is flexible up to 30 mil but thicknesses greater than 30 mil should not be folded without potential
damage. 30 mil LLDPE is recommended. Extra care should be taken to protect against puncture. A
minimum 8-ounce non-woven fabric reinforcement underlayment and 12-ounce overlayment should be
specified. The underlayment reinforcement should be increased to 12-ounce where water tightness is
essential and increased puncture risk exists. Panels as large as 27,000 sqft can be prefabricated into a
4000 Ib roll (30 mil is 0.15 Ibs/sqft). LLDPE has a specific gravity less than 1.0. LLDPE seams can be
taped or field heat welded. Installation costs may increase if field seaming by a specialty contractor is
__ required.
Recommended Confiquration: 30 mil LLDPE with 8 ounce non-woven reinforcement fabric underlayment
and 12-ounce overlayment, open top with high flow bypass.
Recommended Restriction: Do not use for fuel spill containment.
Reinforced Po/ypropylene (RPP), EPDM and XR-5 are excellent materials for lining systems
due to their flexibility, durability and excellent chemical and UV resistance. Although excellent lining
materials, they generally exceed the engineering requirements for typical applications and are higher in
cost than PVC or LLDPE. For fuel and oil concentrations normally found in storm water from parking
_ and roadways, PVC, LLDPE and PP are suitable. However, if containment of aggressive contaminants,
fuels or fuel spills are anticipated, a liner professional should be consulted. XR-5 in thicknesses of 30 mil
or more, with welded seams may be suitable.
Polyethylene (PE) materials are generally inert, offer excellent chemical resistance and are "fish
safe". Although medium density polyethylene (MDPE) liners are widely used for sanitary landfills and
fish ponds, they are generally much higher in total cost and are not likely to
be cost effective lining materials. High density polyethylene (HDPE) is not flexible enough to resist
puncture and conform to the exca�ation. Cost aside, MDPE is an acceptable
liner material for StormTech systems but should be limited to subgrades that are well prepared, without
protrusions and must be field seamed.
�
Page 3 of 6
Tech Sheet#2
Rev. 1/16/06
Reinforcement Materials:
6-ounce ADS 0601 or equal
(M288 Class 2 Std StormTech separation fabric} o�er the top of stone
8-ounce ADS 0801 or equai
for use as reinforcement for PVC, RPP and LLDPE
12-ounce ADS1201 or equal
for use as reinforcement for LLDPE and other PE membranes
Seaming Options:
1. Prefabricated vs. Field Prefabricateciseams are preferable to field seams for all line� materials
.�_
whenever possible.
2. Solvent Welded PVC only, low cost
3. Heat Welded Costly, require trained seamer, for all liner materials
4. Taped Cost effective, M50-RC Gray distributed by Titus Industrial Group recommended, single
sided, 4"width, for all liner materials. No water tightness data is available.
5. Overlapped Not water tight, no leakage rates available, suggest 4 ft overlap for all materials.
Pipe "boots" are used to seal pipe penetrations through the liner. Boots can either be prefabricated by
the liner fabricator or field fabricated by the contractor. The boot is then solvent cemented, heat welded
or taped to the liner. A pipe clamp is normally used to seal the boot around the pipe. Seaming and
sealing pipe boots at low temperatures (32° F minimum) requires preheating of the material.
Design:
General The design of a lined system must be performed by the consulting engineer and, at
minimum, requires knowledge of design storage, peak flow rates and maximum seasonal high
groundwater elevation. This information is used to design the peak flow control structure, maximum liner
height and groundwater control (if necessary).
Hi h Flow Bypass high flow control is an important component for any lined system. The high
flow control is designed to pass t e peak ow while ensuring that the liner is not overtopped. The control
structure can be an upstream high flow bypass or a downstream overflow structure. In both cases, a
high flow weir, very similar to the high flow control in a pond outlet control structure, is normally used.
The high flow wei�should be sized such that the water surface elevation based on the maximum head on
the weir is less than the top of the liner. Additional freeboard should be provided.
In a typical upstream bypass design, the calculated depth of flow over the weir (H) is subtracted
from the maximum water surface elevation in the chamber system to establish the weir crest elevation.
The storage in the chamber system associated with the weir crest elevation may be a design constraint.
The designer may choose to increase the weir length and therefore decrease the flow depth to establish
a higher weir crest.
r
Page 4 of 6
Tech Sheet#2
Rev. 1/16/06
- The equation for a rectangular weir is:
�---- — vs
;` � H = (Q/(CdxL))
HIGH FLOW �', H _ Where: Q =flow over the weir(cfs)
BYPass- -r- ,� Cd =dischar e coefficient = 3.3
STRUCTURE Y�� ` - g
-' . :���;i u H = Depth of flow over crest (ft)
��R � L = length of weir(ft)
In a typical downstream overflow design, the designer may incorporate one or more low flow
orifices into the high flow weir wall. The weir crest is established as described above but hydraulic
losses from the inlet to chamber to the outlet structure may need to be considered. Losses may be
factored in by lowering the weir crest or increasing the liner freeboard.
Buoyancy StormTech recommends against installing lined chamber systems below groundwater.
Although the total weight of a chamber system generally exceeds the buoyant force, a limiting stability
condition may result when the buoyant pressure exceeds the resistance pressure directly under the
chamber. This could result in a heave of the bedding under the chamber leading to instability. To
prevent adverse impacts from ground water, where gravity discharge is possible, StormTech
� recommends the installation of an underdrain system under the liner. Where there is a otential buoyant
orce orm ec recommends a sufficient stone bedding thickness, such that the weight of stone
exceeds the maximum buoyant force.
�'�' The bedding thickness calculation is simplified by ignoring any structural contribution from the
� liner and reinforcing material and considering only the weight of the stone in the thinnest area of the
bedding, which is located under the chamber. .
The relationship between bedding thickness and maximum allowable groundwater elevation is:
_ ___ _ Hy,,,, x (62.4 Ib/ft3) _ �Ystone X t) /SF
� Where:
b�� H9,�, = height of groundwater above liner bottom
� � � i� (inches)
�--
�'�"'� H9'" Ysto�e = bulk density of bedding stone (Ib/ft3)
� a„ -~'P'-Ee'°. � � t = thickness of stone bedding (inches)
9��/ -uNOER�w�w(rYP.) SF = safety factor(1.5 typical minimum) ;I
� The bulk density of the open graded stone bedding materials varies from about 75 Ibs/ft3 to over
100 Ibslft3. Without specific bulk density information for the stone actually used, StormTech
`../ recommends using not more than 75 Ibslft3
'
Page 5 of 6
Tech Sheet#2
Rev. 1/16/06
Installation:
Installation should be in accordance with the liner manufacturer's instructions. Associations
�epresenting membrane materials have developed installation standards and other support documents
for the respecti�e lining materials. Visit their web sites for additional information.
• PVC Geomembrane Institute, University of Illinois, web: http://Pgi-tp.cee.uiuc.edu/forweb
• "HDPE Geomembrane Installation Specification" by the International Association of Geosynthetic
Installers. Revised February 2000: http://www.iagi.org/specifications.htm
PVC and LLDPE liners should not be installed at temperatures less than 32� F or on windy days.
wnd can catch the liner and be extremely dangerous to laborers. Stones and other protrusions should
always be removed from the excavation. Rolling or compacting is recommended to knock down any
remaining protrusions. The non-woven underlayment fabric is then placed in the excavation, the
membrane placed, and a fabric reinforcement placed over the membrane. Liners are flapped by laborers
to get air under the liner to enable easy drag across bed. Corners are generally formed by folding or
"pleating" excess liner material.
An "anchor trench" about 12" deep by 12" wide may be dug
around the top of the excavation to anchor the top of the reinforcement fabric and thermoplastic liner at
the top of the excavation. Stone should be placed carefully to avoid puncture from long free falls. ,
Similarly, additional care must be taken when spreading and compacting bedding stone to prevent I
stones from puncturing the liner during construction. ,
I �'� ��
� THERMOPLASTIC MEMBRANE � ti� ,
� REINFORCEMENT FABRIC REINFORCEMENT FABRIC
' — - - -- -- '� `,La
� _- -_ ---
�-- -
T _ ,_ � _: , r : ' _
'`.�'`���.' ��..rt�. ���`'.� `� ANCHOR ��
LINED STORAGE (h) , S-�� ` ' ,_, ` r, '
' - LENGTH
L_ � �� -
I' - - _
- - - :- -,i- - --__
_ �---- ----W---- - - �
Estimating Liner Material:
Liner fabricators require dimensional details to design panels and provide firm material
quotations. The liner and reinforcing fabric quantities should include sidewalls and extra material for
anchoring during installation. The exca�ation contractor should use care not to overexcavate since a
larger excavation would require additional liner materials.
The fabricated sheet size for estimating purposes is calculated as follows:
Panel Size = [W+ 2(h + FB +AL)]x [L + 2(h + FB +AL)]
Where:
W = system width from StormTech layout drawing
L = system length from StormTech layout drawing
FB = freeboard based on engineer's ad�ice (0.5'typical)
'
Page 6 of 6
Tech Sheet#2
Rev. 1/16/06
AL = anchor length of inembrane and reinforcement to tie back sidewall material
during installation and backfill of chambers (4' typical)
The location and size of pipe penetrations should also be summarized for the fabricator.
i
r -,T -,� _,,
�+h .+ a+� � �' a�� �� � „ � �ra ,
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— ��
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. � i i lil, ���� i �I�_ I � I ° .�i i i�: i �� � i� I � i� � .
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I�� M II 7 �1�� I h � ' �� .�'�� I I�I���II i� �li II'. � I��, I i 11�li il'� I I1 ii �i �� I �
.� �1.� — ��� ���u�I i�Ii � I ,I �li�'�. II I Vi I�I'.� �� �r� � � I�I� �;��� , I I i i ��J� .
; � ' N",.,^IM",-,f.+4,.�wir� 'icl...�.:a�� a�' wH.a=lI+-4 �S^t., �"F L.k,�IpyF-rIWIS����'�#^.-d#,Nt+I�I�eb`Y<I Fb�',f.^
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'�,._! L_—� —__ .. ... ... . . . .�,� _"' _�
- __ _- _ _._. _._._.____.__
Estimating Worksheet:
AL : qL� '
— ----- _ _ _ ____T �
-- � ;
— �' --
h + Fg � I
,�'�� � � � w -�-- � --._-- ��
� ,
__ ---- --- — -------- �
I ' - — ---- L-- -- — ,
�24" HDPE PIPE PENETRATION (EG.) ,
� Panel Size = [W+ 2(h + FB +AL)j x[L + 2(h + FB +AL)] �
DISCLAIMER I
— The information provided in this publication is general information regarding products of StormTech, LLC. SUCH
_ INFORMATION IS PROVIDED ON AN "AS-IS" BASIS WITHOUT REPRESENTATION OR WARRANTY OF ANY KIND,
� ! EITHER EXPRESS OR IMPUED, INCLUDING THE IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE,
BEING FREE OF DEFECTS AND ERRORS, MERCHANTABILITY AND NONINFRINGEMENT. STORMTECH, �LC
EXPRESSLY INTENDS SUCH INFORMATION TO BE SOLELY FOR GENERAL INFORMATIONAL AND PROMOTIONAL
PURPOSES.
Furthermore, such pr�ducts of StormTech, LLC descnbed in this publication may contain components manufactured by third
- parties. STORMTECH, LLC MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND, EITHER EXPRESS OR
IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE, BEING FREE OF
DEFECTS AND ERRORS, MERCHANTABILITY AND NONINFRINGEMENT, REGARDING ANY COMPONENTS OF ITS
PRODUCTS MANUFACTURED BY THIRD PARTIES, INCLUDING WITHOUT LIMITATION LINERS THAT MAY BE
- INCORPORATED INTO ITS PRODUCTS.
t
ROOF DRAIN CONNECTION
PLACE MINIMUM 17.5'OF AASHTO M288 CIASS 1
8"FIELD CUT END CAP 4"0.0.PVC TOP OPENING WOVEN GEOTEXTILE OVER BEDDING STONE FOR
6 EACH(TYP.) (TO BE FIELD CUT) SCOUR PROTECTION AT ALL CHAMBER INLET ROWS
8"SDCO 8�PIPE
ih "
� M
C7 �
TO FLOW CONTROL
CATCH BASIN ISOLATOR ROW'
�
d
� ISOLATOR FABRIC NOT NEEDED-WATER QUALITY TO
0
BE PROVIDED SEPARATE SYSTEM.
<h
�n INSPECTIO�PORT
i[i THERMOPLASTIC LINER(SEE TECH SHEET#2/
O PROVIDED BY OTHEFtS)
�
0
N
�
� PRO�OSED LAYOUT
� PROPOSED ELEVATIONS ���" STORMTECHMC-3500CHAMBERS
� (6)STORMTECH MC-3500 END CAPS
p MIN.GRADE(UNPAVED): 405.70 INSTALLED WITH 12"COVER STONE,9"BASE STONE,30%STONE VOID
� MIN.GRADE(BASE OF FLEXIBLE PAVEMENT): 405.50 INSTALLED SYSTEM VOLUME:4,350 CF
� TOP OF STONE: 404.50
M
M TOP OF CHAMBER: 403.50
+- BOTTOM OF CHAMBER: 399.75
� BOTTOM OF STONE� 399.00
Q
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WDATE DRAWN CHECKED DESCRIPTION
� 9,,,,� K� KS REVISEDWITHMC3500 � VAN'S AUTO REPAIR
� 3131/10 KLJ KAM REVISED PER ENGINEER'S COMMENTS(30%VOIDS,ETC.) �ormTech�
� �� �,,.�,,.R,��, R E N TO�V, WA
U
� Subsurface Stormwater Managemenf' '
L
� 20 BEAVER ROAD,SUITE 104 DATE: 2/12/09 PROJECT: 4889
� THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO STORMTECH UNDER THE WETHERSFIELD,CT O6'I OJ ��
� DIRECT�ON OF THE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE THE DESIGN ENGINEER V:8HS-892-ZB� DRAWN: SKR SvALE: NTS '�
N SHALL REVIEW THIS DR4WING PRIOR TO CONSTRl1C710N. IT IS THE ULTIMATE RESPONSIBILITY OF THE '��,
� wvu�ceo�r¢annc=_srs�r.+s,u+c.• ALL APPLICABLE LAWS,REGULA ONSHAND PROJECT,REQUIREMENTS�L ASSOCIATED DETAILS MEET F:866-328-8401 ,'.
� WWW.STORMTECH.COM CHECKED: KS PAGE: 1 OF 1 ,
' � �