Aqua Swirl Manual 082207Aqua-SwirlT"' Concentrator
Stormwater Treatment
Introduction
System Operation
Retrofit Applications
Installation
Buoyancy
Traffic Loading
Inspection and Maintenance
Aqua-Site Worksheet
Aqua-SwirlT"' Sizing Chart
Aqua-SwirlT"Sample Detail
Aqua-SwirlT" Specifications
`: .~~e:Shield~TM
STORMWATER TREATMENT SOLUTIONS
Table of Contents
AQUA-SWIRL'"
STORMWATER TREATMENT SOLUTIONS 2
System Operation 2
Custom Applications 4
Retrofit Applications 4
Installation S
Buoyancy 6
Traffic Loading 6
Inspection and Maintenance 6
Aqua-Site Worksheets 7
Aqua-Swirl'" Sizing Chart (Eng/ish) B
Aqua-Swirl'" Sizing Chart (Metric) g
Aqua-SwirlTM' Sample Detail Drawings 13
Aqua-SwirlTM SpeciTcations 15
General 15
Scope of Work 15
Materials 15
Pertormance 16
Treatment of Chamber Construction 16
INSTALLATION 17
Excavation and Bedding 1~
Backf II Requirements 16
Pipe Couplings 18
DIVISION OF RESPONSIBILITY 18
Stormwater Treatment System Manufacturer 18
Contractor 18
SUBMITTALS 19
QUALITY CONTROL INSPECTION 1B
2733 Kanasita Drive, Suite B .Chattanooga, Tennessee 37343
Phone (888) 344-9044 • Fax (423) 826-2112
www.a auashieldinc.com
Aqua-SwirlT'"
~ Stormwater Treatment System
The patented Aqua-Swirl'"Stormwater
Treatment Systemprovides ahighly effect
means for the removal of sediment,
floating debris, and free oil. Swirl
technology, or vortex separation, is a
proven form of treatment utilized in
the sormwater industry to accelerate
gravitational separation. Independent
university laboratory performance
evaluations have shown the Aqua-Swirl'"'
achieves a TSS (Total Suspended Solids)
removal of 91% calculated on a net
annual basis. See the "Performance and
Testing"Section for mare details.
Each Aqua-Swirl'" is constructed of
lightweight and durable materials, eliminating the need for heavy lifting
equipment during installation. Inspection and maintenance are made easy, with
oversized risers that allow for both examination and cleanout without entering
the chamber.
u System Operation
The Aqua-Swirl'", with a conveyance flow diversion system, provides full
treatment far the most contaminated "frst flush", while the cleaner peak storm
flow is diverted and channeled through the main conveyance pipe. Many
regulatory agencies are in the process of establishing "water quality treatment
flow rates' for specific areas based on the initial migration of pollutants into the
storm drainage system.
The treatment operation begins
when stormwater enters the
Aqua-Swirl'"' through a
tangential inlet pipe that
produces a circular (or vortex)
flow pattern that causes
contaminates to settle to the
base of the unit. Since
stormwater flow is intermittent
by nature, the Aqua-Swirl""
retains water between storm
events providing both "dynamic
and quiescent" settling of solids.
The dynamic settling occurs
during each storm event while Floatable debris in [he Aqua-Swia'"
the quiescent settling takes place
between successive storms. A combination of gravitational and hydrodynamic
drag forces encourages the solids to drop out of the flow and migrate to the
center of the chamber where velocities are the lowest, as shown from extensive
CFD modeling. See 'Performance and Testing"for more
details.
A large percentage of settleable
solids in stormwater are
reported to be small and
have low settling
velocities.-°
Therefore,
the volume
of water Outlet
retained in
the Aqua-Swirl'"
provides the quiescent settling
that increases performance.
Furthermore, due to fner
sediment adhering onto larger
particles (less than 200
microns), the larger particles
settle, rather than staying
suspended in the water.
Inlet
The treated flow then exits the Aqua-Swirl'" behind the arched outer baffle. The
top of the baffle is sealed across the treatment channel, thereby eliminating
floatable pollutants from escaping the system. A vent pipe is extended up the
riser to expose the backside of the baffle to atmospheric conditions, preventing a
siphon from forming at the bottom of the baffle.
As recommended by the Center for Watershed Protection and several
municipalities, the Aqua-Swirl'"" can also operate in an offline configuration
providing full treatment of the "first flush." However, this orientation requires the
installation of additional manhole structures to diverge the flow to the Aqua-
Swirl*"' for treatment and conveyance back to the existing main conveyance
storm drainage system.
t
~ Custom Applications
The Aqua-Swirl'" system can
be modified to fit a variety of
purposes in the field, and the
angles for inlet and outlet lines
can be modified to fit most
applications. The photo on the
left demonstrates the flexibility
of Aqua-Swirl'" installations.
Two Aqua-Swirl"" units were
placed side by side in order to
treat a high volume of water
while occupying a small amount
of space. This configuration is
an example of the many ways
AquaShield'"" can use our
-~ Retrofit Applications
The Aqua-Swirl"" system is designed so that it can easily be used for retrofit
applications. With the invert of the inlet and outlet pipe at the same elevation,
the Aqua-Swirl'"' can easily be connected directly to the existing storm
conveyance drainage system. Furthermore, because of the lightweight nature
and small footprint of the Aqua SwirlT`", existing infrastructure utilities (i.e.,
wires, poles, trees) would be unaffected by installation.
Installation
The Aqua-SwirlT" system is designed and fabricated as a modular unit with no
moving parts so that no assembly is required on site. This facilitates an easy
installation of the system. - - -
Since all AquaShield'" systems are fabricated from
high performance materials, the Aqua-Swirl"" is
lightweight, and can be installed without the use of
heavy lifting equipment. Lifting supports or cables
are provided to allow easy ofFloading and
installation with a trackhoe. Compared to concrete
systems, using an Aqua-Swirl'" can significantly
reduce installation costs.
In addition, manufactured stub-outs for the inlet
and outlet are provided. This allows the contractor
to simply attach the Aqua-Swirl'"' directly to the
main conveyance storm pipe with rubber couplings.
Typically, an AquaShield"" representative is present
on-site to assist in the installation process.
Buoyancy
~.. .
--
All Aqua-SwirlT"' systems are supplied with an octagonal base plate that extends
a minimum of 6 inches beyond the outside diameter of the swirl chamber. The
function of the extension on this base plate is to provide additional surface area
to counter any buoyant force exerted on the system. The forces created on the
base plate by the weight of the surrounding f II material offsets [he buoyant force
generated within the system. If needed, concrete can be poured directly onto the
base plate to provide additional resistive force. The AquaShieldT"' engineering
staff can provide buoyancy calculations for your site-specifc conditions.
The Aqua-Swirl'" installetl using
a trackhoe
Traffic Loading
When installed in trafFc areas, the system will
be designed to withstand H-20 loading. In
order to accomplish this, a reinforced concrete
pad shall be poured in place above the
system.
See the 'Installation and Fabrication"section
for sample concrete pad details and further
details on installation.
~ Inspection and Maintenance
< f Inspection and deanout of the Aqua-Swirl'"' is simple. The
'~;p.~'' chamber can be inspected and maintained completely
from the surface. Free-floating oil and floatable debris can
be directly observed and removed through the provided
service access.
Cleanout of accumulated solids is needed when the usable
storage volume has been occupied. The depth of solids
can easily be determined using a stadia rod or tape to
~""`~ - measure the top of the solids pile and calculate the
sedime"°'".Pa`°°" distance to the water's surface.
using a statlia rotl
A vacuum truck can be used to remove the accumulated
sediment and debris. Disposal of the material is typically Ii~f;
treated in the same manner as catch basin cleanouts.
AquaShield"" recommends that all materials removed be ~¢ ~.
handled and disposed of in accordance with local and state ~ _~"
requirements. ~ w
For further details on inspection and c%anout procedures, ~ "'; =?'*-=`±p~----
please see the "Maintenance"section. vacnam croak dean: cne
Aqua-Swirl°
Concrete pad protects the /.qua-Swirl`"
from impact loading
Aqua-Site Worksheets
Aqua-Site worksheets are provided as an example of the information that
AquaShieldT"" will need to customize an AquaSwirl"" to a specific work site.
1 completed example
• Z blank worksheets
Aqua-Swir1T'" Sizing Chart (English)
e.
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.
op/
~-
-
. ..r
AS-2 2.50 8 12 1.1 37 30
AS-3 3.25 10 16 1.8 110 20
AS-4 4.25 12 1S 3.2 190 32
AS-5 5.00 12 24 4.4 270 45
AS-6 6.00 14 30 6.3 390 65
AS-7 7.00 16 36 S.6 540 90
AS-8 8.00 18 42 11.2 710 115
AS-9 9.00 20 48 14.2 910 145
AS-10 10.0 22 54 17.5 1130 180
AS-12 12.0 24 48 25.2 1698 270
AS-JO( Custom -- -- >26 -- --
~wexer.sate. yueiity treptmentnws rotes we ne aes;zeea with muiupie swirls.
1) The Aqua-SwirlT" Conveyance Flow Diversion (CFD) provides full treatment of the
"first flush," while the peak design storm is diveded and channeled through the main
conveyance pipe. Please re/er to your local representative for more information.
2) Many regulatory agencies are establishing "wafer quality treatment Flow rates" (or their
areas based on the initial movement of pollutants into the storm drainage system. The
tmatmen[ flow rate o/ [he Aqua-Swirl'"' system is engineered to meet or exceed the
local water quality treatment criteria. This "water quality treatment flow rate"
typically represents approximately 90% to 95% of the total annual mno/f volume.
The design and orientation of the Aqua-Filter'"" generally entails some degree of customization. For
assistance in design and specifc sizing using historical rainfall data, please refer to an AquaShieldT"
representative or visit our website at www.AquaShieldlnacom. CAD details and specifications are available
upon request.
Aqua-SwirlT'" Sizing Chart (Metric)
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onfomipe
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cpo'
e
e..
8
0
AS-2 762 203 305 31 140 .
AS-3 991 254 406 51 416 0.57
AS-4 1295 305 457 91 719 0.91
AS-5 1524 305 610 125 1022 1.27
AS-6 1829 356 762 178 1476 1.84
AS-7 2134 406 914 243 2044 2.55
AS-8 2438 457 1067 317 2687 3.26
AS-9 2743 508 1219 402 3444 4.11
AS-30 3048 559 1372 495 4277 5.10
AS-12 3658 610 1219 713 6427 7.65
AS-)O( Custom -- -- >713 -- --
'HlgM1et watt quality [na[ment flow ales on be Oeslgn¢tl wiM mWeple mias.
1) The Aqua-SwirlT" Conveyance Flow Diversion (CFDJ provides full treatment of the
"(irsf /lush," while the peak design storm is diverted and channeled through the main
conveyance pipe. Please refer to your local representative for more in/ormafion.
2) Many regulatory agencies are establishing "wafer qualify treatment flow rates" for their
areas based on the initial movement of pollutants into [he storm drainage system. The
treatment flaw rate of [he Aqua-SwidT" system is engineered to meet or exceed the local
water quality treatment criteria. This "water quality treatment /low rate" typically
represents approximately 9g% to 95% of the total annual moot/ volume.
The design and orientation of the Aqua-FilterT" generally entails some degree of customization. For
assistance in design and specific sizing using historical rainfall data, please refer to an AquaShieldT"
representative or visit our websi[e at www.AquaShieldlnacom. CAD details and specifications are
available upon request.
~ Aqua-Swir1T"' Sample Detail Drawings
Sample Aqua-SwirlT" detail drawings are provided as examples of the type of
systems that AquaShield'" can offer for a specific work site.
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u Aqua-SwirlT"' Specifications
GENERAL
This specification shall govern the performance, materials and fabrication
of the Stormwater Treatment System.
SCOPE OF WORK
The Aqua-Swirl'^' shall be provided by AquaShieldTM, Inc., 2733 Kanasita
Drive, Chattanooga, TN (888-344-9044), and shall adhere to the following
material and performance specifications at the specified design flows and
storage capacities.
MATERIALS
A. Stormwater Treatment System shall be made from High-Density
Polyethylene (HDPE) resins meeting the following requirements:
1) HDPE Material -The HDPE material supplied under this
specification shall be high density, high molecular weight as
supplied by manufacturer. The HDPE material shall conform
to ASTM 03350-02 with minimum cell classifcation values of
345464C.
2) PHYSICAL PROPERTIES OF HDPE COMPOUND
a) Density -the density shall be no less than 0.955 g/cm' as
referenced in ASTM D 1505.
b) Melt Index -the melt index shall be no greater than 0.15
g/10 minutes when tested in accordance with ASTM D
1238- Condition 190/2.16.
c) Flex Modulus -flexural modulus shall be 110,000 to less
than 160,000 psi as referenced in ASTM D 790.
d) Tensile Strength at Yield -tensile strength shall be 3,000
to less than 3,500 psi as referenced in ASTM D 638.
e) Slow Crack Growth Resistance shall be greater than 100
hours (PENT Test) as referenced in ASTM F 1473 or
greater than 5,000 hours (ESCR) as referenced in ASTM
D 1693 (condition C).
15
f) Hydrostatic Design Basis shall be 1,600 psi at 23 degrees
C when tested in accordance with ASTM D 2837.
g) Color -black with minimum 2% carbon black.
B. REJECTION -The Stormwater Treatment System may be rejected
for failure to meet any of the requirements of this specifcation.
PERFORMANCE
A. The Stormwater Treatment System shall include a =inch inner
diameter (ID) circular hydrodynamic flow-through treatment
chamber to treat the incoming water. A tangential inlet shall be
provided to induce a swirling flow pattern that will cause
sedimentary solids to accumulate in the bottom center of the
chamber in such a way as to prevent re-suspension of captured
particles. An arched baffle wall shall be provided in such a way as
to prevent floatable liquid oils and solids from exiting the treatment
chamber while enhancing the swirling action of the Stormwater.
B. The Stormwater Treatment System shall have a sediment storage
capacity of _ cubic feet and be capable of capturing gallons
of petroleum hydrocarbons. The Stormwater Treatment System
shall have a treatment capacity of cubic feet per second
(cfs). The Stormwater Treatment System shall be capable of
removing floating trash and debris, floatable oils and 80% of total
suspended solids from Stormwater entering the treatment chamber.
C. Service access to the Stormwater Treatment System shall be
provided via 30-inch inner diameter (ID) access riser(s) over the
treatment chamber such that no confined space entry is required to
perform routine inspection and maintenance functions.
TREATMENT CHAMBER CONSTRUCTION
A. The treatment chamber shall be constructed from solid wall HDPE
ASTM F 714 cell class 3454640. For sizes above 63-inch OD, the
treatment chamber shall be constructed from profile wall HDPE
ASTM F 894 RSC 250 pipe or solid wall HDPE.
B. The bottom thickness of the treatment chamber will be determined
in accordance with ASTM F 1759. Calculations must be provided to
justify the thickness of the bottom.
16
C. The inlets and outlets shall be extrusion welded on the inside and
outside of the structure using accepted welding methods.
D. The arched baffle wall shall be constructed from HDPE and shall be
extrusion welded to the interior of the treatment chamber using
accepted welding methods with connections made at 180 degrees
of each end.
E. HDPE lifting supports may be provided on the exterior of the
Stormwater Treatment System in such a way as to allow the
prevention of undue stress to critical components of the
Stormwater Treatment System during loading, off-loading, and
moving operations. The lifting supports shall be constructed as an
integral part of the treatment chamber and extrusion welded using
accepted welding methods.
F. The top of the treatment chamber shall be built to the
requirements of the drawings. Deep burial applications shall require
a reinforced HDPE top.
Reinforced concrete pads spanning the treatment chamber.will be
required with traffc rated frames and covers when the Stormwater
Treatment System is used in traffic areas. A professional engineer
shall approve the design of the concrete pad and the calculations
must be included in the submittal.
The manufacturer, upon request, can supply anti-flotation/
buoyancy calculations. In addition, typical drawings of the
AquaShield"" Stormwater Treatment System with concrete anti-
flotation structures can also be provided. Anti-flotation structure
design and approval are ultimately the responsibility of the
specifying engineer. The contractor shall provide the anti-Flotation
structures.
INSTALLATION
A. Excavation and Bedding
The trench and trench bottom shall be constructed in accordance
with ASTM D 2321, Section 6, Trench Excavation, and Section 7,
Installation. The Stormwater Treatment System shall be installed
on a stable base consisting of 12 inches of Class I stone materials
(angular, crushed stone or rock, crushed gravel; large void content,
containing little or no fines) as defned by ASTM D 2321, Section 5,
Materials, and compacted to 95% proctor density.
17
All required safety precautions for the Stormwater Treatment System
installation are the responsibility of the contractor.
B. Backfill Requirements
Backfll materials shall be Class I or II stone materials (well graded
gravels, gravelly sands; containing little or no foes) as defined by
ASTM D 2321, Section 5, Materials, and compacted to 90% proctor
density. Class I materials are preferred. Backfill and bedding
materials shall be free of debris. Backflling shall conform to ASTM
F 1759, Section 4.2, "Design Assumptions." Backfll shall extend at
least 3.5 feet beyond the edge of the Stormwater Treatment System
for the full height to sub grade and extend laterally into
undisturbed soils.
C. Pipe Couplings
Pipe couplings to and from the Stormwater Treatment System shall
be Fernco°, Mission'" or an equal type flexible boot with stainless
steel tension bands. A metal sheer guard shall be used to protect
the flexible boot.
DIVISION OF RESPONSIBILITY
A. Stormwater Treatment System Manufacturer
The manufacturer shall be responsible for delivering the
Stormwater Treatment System to the site. The system includes the
treatment chamber with debris baffle, inlet and outlet stub-outs,
lifting supports, 30-inch ID service access riser(s) to grade with
temporary cover(s), and manhole frame(s) and cover(s).
B. Contractor
The contractor shall be responsible for preparing the site for the
system installation including, but not limited to, temporary shoring,
excavation, cutting and removing pipe, new pipe, bedding, and
compaction. The contractor shall be responsible for furnishing the
means to lift the system components off the delivery trucks. The
contractor shall be responsible for providing any concrete anti-
floatation/anti-creep restraints, anchors, collars, etc. with any
straps or connection devices required. The contractor shall be
responsible for feld cutting, if necessary, and HDPE service access
risers to grade. The contractor shall be responsible for sealing the
pipe connections to the Stormwater Treatment System, backflling
and furnishing all labor, tools, and materials needed.
78
SUBMITTALS
The contractor shall be provided with dimensional drawings; and when
specifed, utilize these drawings as the basis for preparation of shop
drawings showing details for construction and reinforcing. Shop drawings
shall be annotated to indicate all materials to be used and all applicable
standards for materials, required tests of materials, and design
assumptions for structural analysis. Shop drawings shall be prepared at a
scale of not less than ~/a inch per foot. Three (3) hard copies of said shop
drawings shall be submitted to the specifying engineer for review and
approval.
QUALITY CONTROL INSPECTION
A. Materials
The quality of materials, the process of manufacturing, and the
fnished sections shall be subject to inspection by the specifying
engineer. Such inspection may be made at the place of
construction, on the work site after delivery, or at both places. The
sections shall be subject to rejection at any time if material
conditions fail to meet any of the specification requirements, even
though sample sections may have been accepted as satisfactory at
the place of manufacture. Sections rejected after delivery to the
site shall be marked for identification and shall be removed from
the site at once. All sections, which are damaged beyond repair
after delivery will be rejected; and, if already installed, shall be
repaired to the specifying engineer's acceptance level, if permitted,
or removed and replaced entirely at the contractor's expense.
B. Inspection
All sections shall be inspected for general appearance, dimensions,
soundness, etc.
C. Defects
Structural defects may be repaired (subject to the acceptance of
the specifying engineer) after demonstration by the manufacturer
that strong and permanent repairs will be made. The specifying
engineer, before fnal acceptance of the components, shall carefully
inspect repairs.
19
~ Aqua-Swir1T'" Sizing Chart (English)
e.
.
lfle
opt ~
. .-r
37
10
AS-2 2.50 8 12 1.1
AS-3 3.25 10 16 1.8 110 20
AS-4 4.25 12 18 3.2 190 32
AS-5 5.00 12 24 4.4 270 45
AS-6 6.00 14 30 6.3 390 65
AS-7 7.00 16 36 8.6 540 90
AS-8 8.00 18 42 11.2 710 115
AS-9 9.00 20 48 14.2 910 145
AS-10 10.0 22 54 17.5 1130 180
AS-12 12.0 24 48 25.2 1698 270
AS-lIX Custom -- -- >26 -- --
'HigM1er water puality [reatmentflow 2les on Ee U¢sipnetl wIM mul[Iple swirls.
1) The Aqua-SwirlT" Conveyance Flow Diversion (CFD) provides full treatment of the
"first flush," while the peak design storm is diverted and channeled through the main
conveyance pipe. Please refer to your local repmsenfative for more information.
2) Many regulatory agencies are establishing "wafer quality treatment Flow rates" for their
areas based on the initial movement o/pollutants into the storm drainage system. The
treatment flaw rate o/ [he Aqua-SwidTM^ system is engineered to meet or exceed the
local water quality treatment criteria. This "water quality treatment flow rate"
typically represents approximately 90% to 95% of the total annual runoff volume.
The design and orientation of the Aqua-Filter"" generally entails some degree of customization. For
assistance in design and specific sizing using historical rainfall data, please refer to an AquaShieldTM
representative or visit our website at www.AquaShieldlnc.com. CAD details and specifications are available
upon request.
~ Aqua-SwirlT'" Sizing Chart (Metric)
e.
e
on/omlae
.
cw' . .-r
28
0
AS-2 762 203 305 31 140 .
AS-3 991 254 406 51 416 0.57
AS-4 1295 305 457 91 719 0.91
AS-5 1524 305 610 125 1022 1.27
AS-6 1829 356 762 178 1476 1.84
AS-7 2134 406 914 243 2044 2.55
AS-8 2438 457 1067 317 2687 3.26
AS-9 2743 508 1219 402 3444 4.11
AS-10 3048 559 1372 495 4277 5.10
AS-12 3658 610 1219 713 6427 7.65
AS-XX Custom -- -- >713 -- --
"HIgFtt water quality tma[men[ flow 2[es I'an Oe tle49netl wi[F multlple swirls.
1) The Aqua-SwirlT" Conveyance Flow Diversion (CFD) provides full fn=atment of the
"Iirsf /lush," while the peak design storm is diverted and channeled through the main
conveyance pipe. Please refer to youNOCaI repn=sentative for more in/ormation.
2) Many regulatory agencies are establishing "water quality treatment flow rates" for their
areas based on the initial movement of pollutants into the storm drainage system. The
treatment flow rate of [he Aqua-Swid*" system is engineered to meet or exceed the local
water quality treatment cri[ena. This "water quality treatment flow rate" typically
represents approximately 90% to 95% of the total annual runoff volume.
The design and orientation of the Aqua-Filterr" generally entails some tlegree of customization. For
assistance in design and specific sizing using historical rainfall data, please refer to an AquaShield'"
representative or visit our website at www.AquaShieldlna.com. CAD details and specifications are
available upon request.
u Aqua-SwirITM Specifications
GENERAL
This specification shall govern the performance, materials and fabrication
of the Stormwater Treatment System.
SCOPE OF WORK
The Aqua-Swirl'^' Concentrator shall be provided by AquaShield~"", Inc.
2733 Kanasita Drive, Chattanooga, TN (423-870-8888) and shall adhere to
the fallowing material and performance specifications at the specifed
design flows, and storage capacities.
MATERIALS
A. Stormwater Treatment System shall be made from high-density
polyethylene (HDPE) resins meeting the following requirements:
1) HDPE Material -The HDPE material supplied under this
specification shall be high density, high molecular weight as
supplied by manufacturer. The HDPE material shall conform
to ASTM D3350-02 with minimum cell classifcation values of
345464C.
2) PHYSICAL PROPERTIES OF HDPE COMPOUND
a) Density -the density shall be no less than 0.955 g/cm3 as
referenced in ASTM D 1505.
b) Melt Index -the melt index shall be no greater than 0.15
g/10 minutes when tested in accordance with ASTM D
1238- Condition 190/2.16.
c) Flex Modulus -flexural modulus shall be 110,000 [o less
than 160,000 psi as referenced in ASTM D 790.
d) Tensile Strength at Yield -tensile strength shall be 3,000
to less than 3,500 psi as referenced in ASTM D 638.
e) Slow Crack Growth Resistance shall be greater than 100
hours (PENT Test) as referenced in ASTM F 1473 or
greater than 5000 hours (ESCR) as referenced in ASTM D
1693 (condition C).
f) Hydrostatic Design Basis shall be 1,600 psi at 23 degrees
C when tested in accordance with ASTM D 2837.
g) Color -black with minimum 2% carbon black.
B. REJECTION -The Stormwater Treatment System may be rejected
for failure to meet any of the requirements of this specifcation.
PERFORMANCE
A. The Stormwater Treatment System shall include a =inch inner
diameter (ID) circular hydrodynamic flow-through treatment
chamber to treat the incoming water. A tangential inlet shall be
provided to induce a swirling flow pattern that will cause
sedimentary solids to accumulate in the bottom center of the
chamber in such a way as to prevent re-suspension of captured
particles. An arched baffle wall shall be provided in such a way as
to prevent floatable liquid oils and solids from exiting the treatment
chamber while enhancing the swirling action of the stormwater.
B. The Stormwater Treatment System shall have a sediment storage
capacity of _ cubic feet and be capable of capturing gallons
of petroleum hydrocarbons. The Stormwater Treatment System
shall have a treatment capacity of cubic feet per second
(cfs). The Stormwater Treatment System shall be capable of
removing floating trash and debris, floatable oils and 80% of total
suspended solids from stormwater entering the treatment chamber.
C. Service access to the Stormwater Treatment System shall be
provided via 30-inch inner diameter (ID) access riser(s) over the
treatment chamber such that no confined space entry is required to
perform routine inspection and maintenance functions.
TREATMENT CHAMBER CONSTRUCTION
A. The treatment chamber shall be constructed from solid wall high-
density polyethylene (HDPE) ASTM F 714 cell class 345464C. For
sizes above 63-inch OD, the treatment chamber shall be
constructed from profile wall HDPE ASTM F 894 RSC 250 pipe or
solid wall HDPE.
B. The bottom thickness of the treatment chamber will be determined
in accordance with ASTM F 1759. Calculations must be provided to
justify the thickness of the bottom.
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C. The inlets and outlets shall be extrusion welded on the inside and
outside of the structure using accepted welding practice.
D. The arched baffle wall shall be constructed from HDPE and shall be
extrusion welded to the interior of the treatment chamber using
accepted welding methods with connections made at 180 degrees
of each end.
E. HDPE liking supports may be provided on the exterior of the
Stormwater Treatment System in such a way as to allow the
prevention of undue stress to critical components of the
Stormwater Treatment System during loading, off-loading and
moving operations. The lifting supports shall be constructed as an
integral part of the treatment chamber and extrusion welded using
accepted welding practices.
F. Top of the treatment chamber shall be built to the requirements of
the drawings. Deep burial applications shall require a reinforced
HDPE top.
Reinforced concrete pads spanning the treatment chamber will be
required with traffic rated frames and covers when the Stormwater
Treatment System is used in traffic areas. A professional engineer
shall approve the design of the concrete pad and the calculations
must be included in the submittal.
The manufacturer upon request can supply anti-flotation/ buoyancy
calculations. In addition, typical drawings of the AquaShield
Stormwater Treatment System with concrete anti-flotation
structures can also be provided. Anti-flotation structure design and
approval are ultimately the responsibility of the specifying engineer.
The contractor shall provide the anti-Flotation structures.
INSTALLATION
A. Excavation and Bedding
The trench and trench bottom shall be constructed in accordance
with ASTM D 2321, Section 6, Trench Excavation, and Section 7,
Installation. The HDPE Stormwater Treatment System shall be
installed on a stable base consisting of 12 inches of Class I stone
materials (angular, crushed stone or rock, crushed gravel; large
void content, containing little or no fines) as defined by ASTM D
2321, Section 5, Materials, and compacted to 95% proctor density.
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All required safety precautions for Stormwater Treatment System
installation are the responsibility of the Contractor.
B. Backfill Requirements
Backfill materials shall be Class I or II stone materials (well graded
gravels, gravelly sands; containing little or no fines) as defined by
ASTM D 2321, Section 5, Materials and compacted to 90% proctor
density. Class I materials are preferred. Backfll and bedding
materials shall be free of debris. Backflling shall conform to ASTM
F 1759, Section 4.2, "Design Assumptions". Backfill shall extend at
least 3.5 feet beyond the edge of the Swirl Concentrator for the full
height to sub grade and extend laterally into undisturbed soils.
C. Pipe Couplings
Pipe couplings to and from the Stormwater Treatment System shall
be Fernco°, Mission"^ or equal type flexible boot with stainless
steel tension bands. A metal sheer guard shall be used to protect
the flexible boot.
DIVISION OF RESPONSIBILITY
A. Stormwater Treatment System Manufacturer
The Manufacturer shall be responsible for delivering the
Stormwater Treatment System to the site. The system includes the
treatment chamber with debris baffle, inlet and outlet stub-outs,
liking supports, 30-inch ID service access riser(s) to grade with
temporary cover, and manhole frame(s) and cover(s).
B. Contractor
The Contractor shall be responsible for preparing the site for the
system installation including, but not limited to, temporary shoring,
excavation, cutting and removing pipe, new pipe, bedding, and
compaction. The Contractor shall be responsible for furnishing the
means to lift the system components off the delivery trucks. The
Contractor shall be responsible for providing any concrete anti-
floatation/anti-creep restraints, anchors, collars, etc. with any
straps or connection devices required. The Contractor shall be
responsible far feld cutting, if necessary, HDPE service access
risers to grade. The Contractor shall be responsible for sealing the
pipe connections to the Stormwater Treatment System, backf Iling
and furnishing all labor, tools, and materials needed.
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SUBMITTALS
The Contractor shall be provided with dimensional drawings and, when
specifed, utilize these drawings as the basis for preparation of shop
drawings showing details for construction and reinforcing. Shop drawings
shall be annotated to indicate all materials to be used and all applicable
standards for materials, required tests of materials and design
assumptions for structural analysis. Shop drawings shall be prepared at a
scale of not less than Ya inch per foot. Three (3) hard copies of said shop
drawings shall be submitted to the Specifying Engineer for review and
approval.
QUALITY CONTROL INSPECTION
A. Materials
The quality of materials, the process of manufacture, and the
finished sections shall be subject to inspection by the Specifying
Engineer. Such inspection may be made at the place of
manufacture, or on the work site after delivery, or at both places.
The sections shall be subject to rejection at any time if material
conditions fail to meet any of the specification requirements, even
though sample sections may have been accepted as satisfactory at
the place of manufacture. Sections rejected after delivery to the
site shall be marked for identification and shall be removed from
the site at once. All sections, which are damaged beyond repair
after delivery will be rejected and, if already installed, shall be
repaired to the Specifying Engineer's acceptance level, if permitted,
or removed and replaced, entirely at the Contractor's expense.
B. Inspection
All sections shall be inspected for general appearance, dimensions,
soundness, etc.
C. Defects
Structural defects may be repaired, subject to the acceptance of
the Specifying Engineer, after demonstration by the manufacturer
that strong and permanent repairs will be made. The Specifying
Engineer before final acceptance of the components shall carefully
inspect repairs.
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