RainSmart Ellipse - Tank Installation · ®RainSmart Ellipse Tank Installation 1. Excavation The...

RainSmart®

Ellipse - Tank Installation

Assembling Installing Backfilling

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ChecklistA. Tools you’ll need • Laser or Transit • Measuring Tape (long enough to mark Rainsmart Tank footprint) • Razor Knife • Screw Driver/Nut Driver Set • String Line • Marking Line • Reciprocating Saw (to cut in Inspection & Maintenance Ports • Metallic Tape

If you’re assembling Rainsmart Tanks: • Dead-Blow Rubber Mallets • Work Tables (3/4” Plywood Placed on Assembled Tanks works Well)

B. Materials you’ll need • Rainsmart Tank Module Units • Geotextile • Geogrid (Only for Load Bearing Application) • Impermeable Liner (Only for Retention / Recycling Tank Application) • Clean Base & Backfill Material (95% Compactable angular stone or sand ½” - 2”, free of debris - NO CLAY) • Pipe Boot Kits (If not using kits, you’ll need duct tape and a stainless steel band clamp for each inlet and outlet pipe, and for each inspection or maintenance port.) • Pipe for Inspection & Maintenance Ports (Typically 6” (150mm) and 12”(300mm) schedule 40 PVC, respectively) • Ring, collar & cap (to fit all ports) • Maintenance Port Kits (If not using kits, you will need non corrosive rigid anti-scour pad [15” x 15”] [375mm x 375mm] to fit below Maintenance ports. Plexiglass works well. Fabric pipe boot, duct tape, stainless steel band clamp and H20 loaded ring and cover.)

C. Equipment you’ll need • Forklift and other equipment/tools needed to unload box truck • Pallet jack (to unload material from box truck) • Walk-Behind Trench Roller (Plate compactor may work for smaller projects) • Low Ground Pressure (LGP) tracked Skid Steer or Loader (<7.0 psi Gross Operating Pressure) • For Larger Projects (>10,000cf ): • LGP Dozer • Roller - 5 Ton Max Gross Vehicle Weight

Most contractors find installing a Rainsmart Tank system

surprisingly easy.

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2 of 17 - ELLIPSE TANK INSTALLATION

Note: This list does not include equipment or tools needed to excavate or level the floor of the excavation.

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D. General Notes Be sure to contact your local Representative at least two weeks prior to installation. We will provide you with onsite installation support in order to facilitate your installation.

All pictures, illustrations and instructions have been included to guide you through a typical installation. The approved engineering drawings should ALWAYS take precedence over these instructions.

Coordinate the installation of Rainsmart-Tank System at the end of the construction activities to minimize the construction traffic over the system. If the installation is completed during construction activities then the system MUST be roped off and construction traffic routed around the system (including excavators, loaders, dump trucks, forklifts, concrete trucks, material delivery trucks and cranes). The installation contractor is responsible for all loads placed or driven over the R-Tank during the construction process: (including excavators, loaders, dump trucks, forklifts, concrete trucks, material delivery trucks and cranes). Rope off the area to prevent unauthorized traffic from driving over the R-Tank. If sequencing of the project makes this impossible, a construction road or pad may be constructed over the R-Tank System. Consult the project engineer and/or Rainsmart Solutions for assistance before allowing construction traffic on system. (See Step #12: Secure the Installation for additional information.)

After installation of the Rainsmart Tank system, stormwater should not be allowed to enter the Tank until the site is completely stabilized and all pre-treatment systems (designed to remove debris and heavy sediment) are active.Otherwise, the R-Tank may become prematurely contaminated with sediments from the project. For more information on Pre-Treatment systems, contact Rainsmart and request a copy of our Pre-Treatment Tech Note.

Throughout this document you will see three types of notes:

TIP Ideas to improve your profitability on the installation.

IMPORTANT Steps that require extra attention.

WARNING Critical issues that MUST be handled correctly to ensure a good installation.

Any questions or issues not covered by these instructions can be directed to:

CIRTEX INDUSTRIES LTD PHONE +64 7 868 9909 0800 CIRTEX (247 839) FAX +64 7 868 3435 EMAIL [email protected] WEBSITE WWW.CIRTEX.CO.NZ

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The excavation limits and the location of the Ellipse Tank System should bestaked out. The design drawings should be used to determine these locations. If the excavation limits are not shown on the plans, then add 2’ (500mm- 600mm) on each side of the R-Tank System to determine the limits.Excavate the designated surveyed area according to plans following allrelevant local, state and OHS guidelines. Typical excavations should include: • Two foot (500mm-600mm) perimeter around R-Tank to allow for proper compaction of backfill. • Enough depth to accommodate a minimum 3-5” (50mm-100mm) base below the Ellipse Tanks.

Level the bottom of the excavation (Fig. 4) as shown on plans. Most excavations have a flat bottom.

Prepare the subgrade according to plans. Base of excavation shall be smooth, level and free of debris. Compact to at least 95% Standard Proctor Density (or as required by Engineer) unless infiltration of stormwater into sub grade is desired. A thin layer (3-4”) 100mm of material is recommended to establish a level working platform. (May not be needed in areas with sandy soils). A CBR > 5 must be achieved prior to beginning installation of Ellipse Tanks.

If the subgrade is pumping or appears excessively soft, the design engineer should be consulted for advice. In many cases a stabilization Geotextile and 6” of compactable material that drains well will be sufficient to amend thebearing capacity of the soil.

Fig. 4 Excavate according to plans, following all Government & OHS Regulations

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tion2. Assemble

RainSmart® Tank UnitsIf Ellipse Tank units arrive on your project in flat panels they will need to be assembled on-site. Building the units should take 2-3 minutes per segment. This is a conservative estimate used to approximate the total man hoursneeded for assembly. The estimate includes the workers doing the assembly as well as material handling people to keep the assembly workers moving.

Assembly Instructions - following the drawings in Fig. 2: Connect four small panels (B) into one large panel (A) using the short pegs (not the long pegs). Attach small panels onto the large panel at the locations marked in white on Fig. 1. Do NOT use the row of pin-holes directly in the centre or the two middle rows nearest the edges, as marked in red on Fig. 1 unless you are building a 5-plate Ellipse Tank. Use 5-plate units for installation with more than 7’ (2.1m) of cover, and for installations beneath traffic loads with less than 24” (600mm) of cover.

Next, working from one end to the other, attach a second large plate (A)on the opposite side of the first. Once the top and bottom large plates areattached, two more side plates (A) are attached to complete the sides ofthe R-Tank unit. This is a SINGLE Ellipse Tank.

To build a DOUBLE unit (or larger), follow the directions above, starting at “Assembly Instructions:” using the top of the existing unit as the large plate.Completed Ellipse Tank units should be staged as close to the installation area as possible.

Fig. 1 Attach Small Plates at locations circled in Green such that all small and large Pegs on same side.

Fig. 2 Follow these steps to assemble a Std 4-Plate Ellipse Tanks

Fig. 3 Installation can be speeded up byeither assembling the tanks in theexcavation or placing the preassembled tanks in the excavation.

TIP

To increase the speed of the installation, many contractors choose to assemble the Ellipse Tank unit’s prior to or during excavation (Step 2) and base preparation (Step 3). Other contractors wait until these steps are completed and then perform the assembly IN THE EXCAVATION (Fig. 3) allowing completed units to be placed into their final location as they are assembled. Consider which option will work best for your project.

UNITS TIME

Half 2-3 MinutesSingle 2-3 MinutesDouble 4-6 MinutesTriple 6-9 MinutesQuad 8-12 MinutesPenta 10-15 Minutes

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tion 3. Prepare Base

Examine prepared excavation and conditions for smoothness, compactionand level. Do not start Ellipse Tank installation until unsatisfactory conditionsare corrected. Check for presence of high water table, which must be kept atlevels below the bottom of the Ellipse Tank structure at all times. Installationconstitutes acceptance of existing conditions and responsibility forsatisfactory performance. If existing conditions are found unsatisfactory,contact Project Manager for resolution.

Standing water in the excavation will prevent proper base preparation andmust be removed, if present. In regions with sandy soils meeting therequirements noted and where the subgrade elevation is above thegroundwater table, imported backfill materials may not be needed.

Install base materials. Base materials must be:

Grade and level base as shown on plans with more than 1/2” variance. Base must be free of debris and large rocks.

Compaction 95% Compactable

Shape Angular

Size Not Larger than 1” in Diameter (10-20mm dia is ideal)

Consistency Free of Lumps, debris and sharp objects that could puncture the Geotextile

Applicability Stone or sand is acceptable if it meets these requirements. In NO case shall clays be used

Fig. 5 Base must be smooth to ensure units fit together without gaps.

TIP

Creating a smooth, level platform will allow for faster installation of Ellipse Tanks, as they will fit together evenly, eliminating detail work that can delay your progress (Fig. 5).

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tion4. Place Geotextile

Geotextile will be required below the Ellipse Tank on most projects, but notall. Check your plans to ensure that geotextile is to be placed between thebase and the Ellipse Tank units.

Cut full-width strips of Geotextile to the proper length and place them overthe base, covering the floor of the excavation. The Geotextile should extendat least 2’ beyond the edge of the Ellipse Tank footprint. This will enable thewhole unit to be able to be wrapped to the dimensions required. Alloverlaps are then to be suitably secured, weighted down tapped or stapledin order to minimize the ingress of deleterious materials.

Geotextile are flammable. No smoking should be permitted on theGeotextile.

Adjacent panels of material should be overlapped by 12” (300mm) ormore, as shown on the plans (Fig. 7). Use pins, staples, sandbags or otherballast to hold the Geotextile in place, preventing it from blowing or slidingout of position. Patch any holes made in the Geotextile by placing a smallpatch of fabric over the damaged area. The patch must be large enough tocover the damaged area with at least 12” (300mm) of overlap onundamaged material.

If a liner and/or additional Geotextile are required per plans, install thesenow as shown on the project plans.

Fig 6Pull Wrinkles out of Geotextile so Material lays flat.

Fig 7Overlap Geotextile by minimal 12” (300mm) or more.

TIP

Some contractors choose to cut the Geotextile strips long enough to wrap up the sides and over the top of the Ellipse Tank in a single piece (Fig. 6). If space allows and the folded flaps of Geotextile will not slow our progress, you may want to consider doing this. If a liner is required on your project, this method should be used to protect the liner.

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tion 5. Install R-Tanks

Determine the starting location. It is often helpful to use an inlet or outletpipe to guide you. Using a string line, establish two adjacent edges of theEllipse Tank footprint. Ensure that your corner is square. Mark these twoedges with marking paint and remove the string line (Fig. 8 & 8A).

Begin placing Ellipse Tanks in the corner of the marked area. Do NOT placeunits on their sides, as this will void the warranty. Check your plans toensure correct orientation of the Ellipse Tanks (Fig. 9).

Check the plans to ensure the Ellipse Tanks are running in the correctdirection (North/South vs. East/West) to match the footprint shown.

• Ellipse Tank Width - 15.75” (400mm) • Ellipse Tank Length - 28.15” (715mm)

Ellipse Tank units should fit together evenly. Minor gaps between units (<½”) or variations in the height of the units (< ½”) are acceptable (Fig. 9A),but reasonable efforts should be made to minimize these variations. Minorgaps will be eliminated during compaction of side backfill material. No lateral connections between adjacent Ellipse Tanks are required, but frame Modules can be cable tied as a housekeeping measure.

Fig 8Use a String line & marking paint to square the system footprint.

Fig 8AUse a String line & marking paint to square the system footprint.

Fig 9Make Sure the tanks are orientedProperly and correct way in the excavation.

Fig 9AMinor variations(less than width of the top plate) in height are acceptable.

IMPORTANT

If using a liner, be careful not to puncture it with stakes or pins while placing your string line.

TIP

Moving Ellipse Tank units into the excavation quickly is essential to a profitable installation. Many contractors fabricate a platform that can be lifted by their forklift to quickly move a large number of units with each trip.

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tion5. Install R-Tanks

The large side plate of the tanks should be placed on the perimeter of thesystem. This will require that two ends of the tank area will have a row oftanks placed perpendicular to all other tanks (Fig. 10).

Option 1: End column should cover 75% of the final row.

Option 2: End column may extend beyond the final row.

After placement of Rainsmart® tanks, wrap with geotextile which is brought up around the sides and lapped over the top of the full structure. Should any gaps be evident additional fabric can be cut and placed over any of these areas. Fold excess fabric at corners to lay flat against sides of structure, securing folds and seams with staples or similar methods.

Identify locations of inlet, outlet, inspection ports, and any other penetrations. All pipes should be positioned at 90 degree to the tank structure. Any inlets, outlets etc should be installed flush (butted up) to the tank and the geotextile fabric shall be cut to enable hydraulic continuity at the inlet and outlet and secured around the pipe using a suitable coupling or a stainless steel clamp prior to backfilling.

Tanks require ventilation for proper hydraulic performance, number of pipes and vents will depend on the size of the tank.

Vents are often installed using a 90 degree elbows etc with PVC pipe into soft landscape area with ‘U’ bend or venting bollard to inhabit the ingress of debris, alternatively a ground level concrete steel cover can be fixed to suit.

Fig 10Plan view showing the end row turned perpendicular, corners may not matchup, so 2 options shown.

Continued...

TIP

Moving Ellipse Tank units into the excavation quickly is essential to a profitable installation. Many contractors fabricate a platform that can be lifted by their forklift to quickly move a large number of units with each trip.

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tion 6. Install Inspection

Maintenance PortsAll ports should be made from pipe long enough to extend from the bottom of the R-Tank to finished grade. They are typically Schedule 40 PVC pipe, but can be formed from other types of pipe, as well.

Identify the location of all ports and remove the Ellipse Tank from eachlocation.

Inspection Ports:Typically made from 6” (150mm) Schedule 40 PVC pipe, cut the pipe tolength, leaving enough excess to trim the top when final grade is reached(Fig. 11).

If the pipe is not already perforated, cut several horizontal slots in the pipe starting at the bottom. Perforations should extend as high as the height of the Ellipse Tank units being used. No perforations should be visible above the top of the Ellipse Tank once the port is in place.

Using your reciprocating saw, cut the horizontal Ellipse Tank plates (Fig. 12) in the centre, between the two internal plates, to accommodate the port. If the pipe will not fit between the two interior plates, one or both plates may be moved to the outer connection locations on the large plate (Fig. 13). All horizontally oriented plates will need to be cut EXCEPT FOR THE BOTTOM PLATE. In total you will need to cut:

Fig 11Installed inspection Port

TIP

If the location of Inspection Ports is not shown on your plans, use a single Inspection Port located in the middle of the field of Ellipse Tank units.

IMPORTANT

Do not over-cut the Ellipse Tanks Plates, Minimize the gaps between the pipe and the Ellipse tank plates. This is particularly important with the top plate.

UNITS TIME

Single 1 PlateDouble 2 PlatesTriple 3 PlatesQuad 4 PlatesPenta 5 Plates

Fig 12Cut the Horizontal Plates toaccommodate all ports.

Fig 13Additional Space for port can becreated by moving the internal plates towards the ends

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Maintenance Ports

Install the pipe into the Ellipse Tank unit (Fig. 17)

Seal the opening on top of the pipe with a cap or temporary lid to prevent debris from entering the system.

Maintenance PortsTypically made from 12” (300mm) Schedule 40 PVC pipe (check plans for actual type and size of pipe), cut the pipe to length,leaving enough excess to trim the top when final grade is reached.

Using your reciprocating saw, cut several 8” notches into the bottom of the pipe as shown on plans (Fig. 14).

TIP

If using Prefabricated Pipe Boot Kits, install them onto the pipenow, leaving the band clamps loose so that final adjustments may bemade in Step 7.

TIP

If the location of Maintenance Ports is not shown on your plans,include a port within 10’ (3mts) of all inlet and outlet pipes(a singlemaintenance Port can cover multiple pipe connections), and includeadditional Maintenance Ports, as needed, to prevent the distancebetween ports from exceeding 65 feet (20mts).

Fig. 14 Cut 8” (200mm) notches into thebottom of Maintenance Port.

Fig. 15 if after adjusting the internal plates, the pipe will not fit, the top plate can be cut off-centre and one of the internal plates canbe removed.

Continued...

For all units larger than a Single Tank, you will need to disassemble the Ellipse Tank in order to cut the interior plates. Reassemble the E Tanks when cutting is completed, and replace the R-Tank into the proper location. (Fig: 15 & 16)

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IMPORTANT

Do not over-cut the Ellipse Tank plates. Minimize the gapsbetween the pipe and the R-Tank plates. This is particularly important with the top plate (Fig. 16).

6. Install Inspection Maintenance Ports

For all units you will need to disassemble the Ellipse Tank in order to cut and/ or move the interior plates.

Reassemble the Ellipse Tank when cutting is completed (Fig. 16). Remember to insert the non-corrosive anti-scour pad in the bottom of the Ellipse Tank (should fit directly below the Maintenance Port), and replace the Ellipse Tank into the proper location (Fig. 15 and 16).

Install the pipe into the Ellipse Tank unit (Fig. 17)Seal the opening on top of the pipe with a cap or temporary lid to prevent debris from entering the system.

TIP

If using Prefabricated Pipe Boot Kits, install them onto the pipenow, leaving the band clamps loose so that final adjustments may bemade in Step 7.

Continued...

Using your reciprocating saw, cut the horizontal Ellipse Tank plates in the centre, between the two internal plates, to accommodate the port. If the pipe will not fit between the two interior plates, one or both plates may be moved to the outer connection locations on the large plate (Fig. 13). All horizontally oriented plates will need to be cut EXCEPT FOR THE BOTTOM PLATE. In total you will need to cut:

UNITS TIME MOVE

Mini 1 Large Plate 2 Small PlatesSingle 1 Large Plate 2 Small PlatesDouble 2 Large Plates 4 Small PlatesTriple 3 Large Plates 6 Small PlatesQuad 4 Large Plates 8 Small ModulesPenta 5 Large Plates 10 Small Plates

Fig. 16 Installed maintenance port

Fig. 17 Install port into R-Tank..

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IMPORTANT

Take special care with Inside Corners on the footprint of the system. Cut geotextile as needed to ensure that it lays flat against the Ellipse Tank. Use additional pieces of geotextile to seal the corner and any cuts that are made (12” overlap).

7. Seal Tanks with GeotextileClean off any debris that may be lying on top of the exposed Geotextile around the perimeter of the Ellipse Tank.

Cut strips of geotextile to fit over the top and down both sides of the Ellipse Tank with at least 2’ of excess material on each side of the system. This 2’ flap should overlay the geotextile placed below the Ellipse Tank units, creating a clean 24” overlap to seal the system.

Adjacent strips of geotextile should overlap at least 12” or as shown on plans. Use duct tape, sand bags or other ballast to temporarily secure overlaps (Fig. 18).

Where the geotextile intersects an Inspection or Maintenance Port, cut an “X” into the geotextile and pull it over the pipe. The flaps of the “X” should point AWAY from the Ellipse Tank (Fig. 19). Use stainless steel band clamp to seal the flaps to the pipe.

Fold geotextile for outside corners similar to sheets on a bed, and lay excess material flat against Ellipse Tank. Leave corners loose to avoid creating weak spots in the material. Temporarily secure excess fabric with duct tape (Fig. 20).

Fig. 18 Maintain 12” (300mm) overlap

Fig. 19 Cut an “X” into textile toaccommodate pipe penetration.

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WARNING

Inlet and Outlet pipes must make DIRECT contact with the RTank,allowing effluent to flow directly into or out of the Ellipse Tankwithout filtering through the geotextile. Failing to correctly connect pipes to the Ellipse Tank will void the warranty.

7. Seal Tanks with Geotextile

Connect Inlet & Outlet Pipes

Where the inlet and outlet pipes connect to the Ellipse Tank, cut an “X” into the geotextile so that the pipe makes DIRECT contact with the Ellipse Tank. Pull the flaps of the “X” over the pipe so that the flaps of the “X” point AWAY from the Ellipse Tank. Use a stainless steel band clamp to seal the flaps to the pipe.

If used, adjust all pipe boots so that the fabric lays snug against the EllipseTank.Tighten the band clamps with a screw/nut driver. Use duct tape to secure the boot flap to the outside of the geotextile envelope (Fig. 21). Walk bottom edge of geotextile to eliminate gaps between the fabric and the bottom corner of the Ellipse Tank (Fig. 22).

TIP

If using Prefabricated Pipe Boot Kits, install them onto the Inletand Outlet Pipes, leaving the band clamps loose so that finaladjustments may be made.

Fig. 20 Encapsulate R-Tanks with geotextile

Fig. 21 Seal the pipe boot with bandclamps and duct tape.

Continued...

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IMPORTANT

Vibratory compaction of the side backfill (Fig. 23) is a criticalstep that both compacts the backfill and eliminates the minor gapsbetween individual Ellipse Tank units. While some backfill materials willyield a 95% proctor density without compaction, vibratory compaction of the material must be completed to ensure the stability of the system. Skipping this step will void the manufacturer’s warranty.

8. Backfill SidesPlace Backfill material (same as Base Materials in Step 3) around perimeter of the Ellipse Tank, distributing the material evenly to prevent shoving of the Ellipse Tank units.

Use a trench roller or plate compactor to compact backfill in 12” (300mm) lifts.

Continue placing and compacting backfill in 12” (300mm) lifts until the material reaches the top of the Ellipse Tank units.

Fig. 23 Vibratory compaction of side backfill is alwaysrequired , regardless of what backfill material is used.

Fig. 22 “Walk” the geotextile into thecorner to eliminate folds & air gaps.

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tion 9. Backfill Top

TIP

When pushing backfill over Ellipse Tank units, work in the direction of the geotextile overlap to avoid shoving material between the fabric layers.

WARNING

Dump trucks should not drive over or dump material on top of the Ellipse Tank without a minimum of 36” (900mm) of cover, plus Geogrid.

WARNING

Some materials will compact significantly while others may shove excessively as you work. Never allow your lift thickness to compact to less than 12” without adding more material.

Dump backfill material adjacent to the Ellipse Tank and, using your LGP Skid Steer or Dozer, push the material over the Ellipse Tank system (Fig. 24).

If your machine is not listed, you’ll need to find your vehicle’s Operating Weight and measure the area where the tracks contact the ground. Take these dimensions and multiply them (Length x Width), then multiply by 2 (since the machine has two tracks), then divide the Operating Weight by the total square inches (sqm) of contact area to determine the contact pressure of the machine. If the contact pressure is less than 7.0 (4.8 t) and the operating weight is less than 20,000 lbs(9.0 t) the machine willwork with 18” (450mm) of cover.

Compact top backfill to 95% standard proctor density or as shown on plans using your walk-behind trench roller. Alternately, a roller (maximum gross vehicle weight of 5 tons) may be used.

** This list is not intended to be all inclusive, but representative.

Largest Track Dozers that can be used with 18” (450mm) of cover over the Ellipse Tank.

Fig. 24 Use an LGP dozer to push backfill over Ellipse Tank units.

MACHINE OPERATINGWEIGHT

(imp)

OPERATINGWEIGHT(metric)

TRACK DIMENSIONS

(imp)

TRACK DIMENSIONS

(metrics)

GROUND PRESSURE

(imp)

GROUND PRESSURE

(metric)

Case 850K LGP

Caterpillar D5K LGP

John Deere 550J LGP

Komatsu D39PX-21

New Holland D95 LGP

20,700 lbs

21,347 lbs

18,252 lbs

19,620 lbs

20,700 lbs

9.38 t

9.68 t

8.27 t

8.90 t

9.38 t

28” x 92.6”= 2593 si

26” x 91”= 2366 si

24” x 86”= 2064 si

25” x 93”= 2325 si

28” x 93”= 2604 si

0.7m x 2.35m = 1.67 sqm

0.66m x 2.31m = 1.52sqm

0.61m x 2.18m = 1.33 sqm

.635m x 2.36m = 1.49 sqm

0.71m x 2.36m = 1.68 sqm

4.0 psi

4.52 psi

4.2 psi

4.27 psi

4.0 psi

2.8 t/sqm

3.17 t/sqm

2.95 t/sqm

3.00 t/sqm

2.81 t/sqm

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TIP

To achieve proper compaction requirements, it may be beneficial to begin placing material in 6” (150mm) lifts.

10. Place GeogridGeogrid is required for all load-bearing applications (Fig. 25), such as systems placed beneath parking lots and roads. It is not required above systems used in open space where traffic is prohibited, such as sport fields or natural areas.

Geogrid must be placed 12” (300mm) above the Ellipse Tank. Overlap adjacent panels by 18”(450mm) minimum or as specified in plans. Roll out Geogrid over the top of the system, with the edges of the grid extending 5’ from Ellipse Tank footprint or 3’ from edge of excavation or more as show on plans (refer to CAD detail H20 loads).

Fig. 25 Overlap Geogrid 18” (300mm) oras required by plans.

11. Place Additional Cover Material as NeededIf additional cover or pavement base is required by the plans, begin placingand compacting material in the same manner as discussed in Step 9. Pushcover material parallel to the geogrid for best results (Fig. 26).

Maximum cover for Ellipse Tank system is 7’ (2.2m) with 4 internal plates or 10’ (3m) with 5 internal plates. If your system exceeds these limits contact a Rainsmart Representative.

Fig. 26 Overlap Geogrid 18” or as required by plans.

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IMPORTANT

Some projects require the use of cranes above the Ellipse Tank. While it is advisable to avoid this scenario, it may be feasible to utilize a crane over the Ellipse Tank based on the depth of the Ellipse Tank installation and the size and weight of the crane. Please consult the project engineer or Rainsmart for assistance prior to allowing a crane to drive over Ellipse Tank system.

12. Secure the InstallationThe Ellipse Tank System should be secured to prevent damage fromconstruction equipment once it has been installed.

Rope Off Area (preferred method)Use warning tape or temporary fencing to prevent unauthorized traffic fromdriving over the Ellipse Tank.

Regardless of which method is selected to secure the installation, it mustremain in place until one of the following conditions is met:- Pavement has been placed- Construction activity at the site has been completed.

Fig. 27 Secured Ellipse Tank installationusing Jersey Barriers.

13. Installing Pre - treatment DevicesIf additional cover or pavement base is required by the plans, begin placingand compacting material in the same manner as discussed in Step 9. Pushcover material parallel to the geogrid for best results (Fig. 26).

Call us or visit our website for more great products0800 CIRTEX (247 839) I WWW.CIRTEX.CO.NZ

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Row

1.0 The Inspection Row

1.1 INTRODUCTION

An important component of any Stormwater Pollution Prevention Plan is inspection and maintenance. The Rainsmart Inspection Row is a design registered technique to inexpensively enhance Total Suspended Solids (TSS) removal and provide easy linear access for inspection and maintenance.

Engineers and designers have concerns of possible sediment and silt build-up in the system over time, and the lack of ability of the modular system to be “flushed out”. The new Rainsmart tank range incorporates a unique 160mm/300mm pre-moulded cut outs in its panels which provide complete linier access to the underground stormwater structure for maintenance or flush out. These pre-moulded access/inspection panels make onsite assembly easy without involving any of the cutting, penetration and plastic welding exercise of the panels to create access, the added advantage of the system is that it doesn’t compromise load distribution and compressive strength of the tank modules.

1.2 The “INSPECTION ROW”

The Inspection Row is a row of Rainsmart Tank Modules with Inspection plates, either Ellipse Tank or Nero Tank models, that is surrounded with filter fabric and connected to a closely located manhole for easy linear access to the entire length of the tank structure. The fabric-wrapped chambers provide for settling and filtration of sediment as storm water rises in the Inspection row and ultimately passes through the filter fabric. The Inspection Row and its perforated sidewalls allow storm water to flow both vertically and horizontally out of the modules. Sediments are captured in Inspection Row protecting the storage area from sediment accumulation. A non-woven Geotextile fabric is placed between Inspection Row chambers and the main tank. The tough Geotextile provides a media for storm water filtration and provides a durable surface for maintenance operations. It is also designed to prevent scour of the underlying stone and remain intact during high pressure jetting. A non-woven fabric is placed over the to provide a filter media for flows passing through the perforations in the sidewall of the chamber.

The Inspection row is typically designed to capture the “first flush” and sediments and offers the versatility to be sized on a volume basis or flow rate basis. An upstream manhole not only provides access to the Inspection Row but typically includes a high flow weir such that storm water flow rates or volumes that exceed the capacity of the Inspection Row overtop the over flow weir and discharge through a manifold to the other chambers. The Inspection Row is also part of a treatment train. By treating storm water prior to entry into the chamber system, the service life can be extended and pollutants such as hydrocarbons can be captured. Pre-treatment best management practices can be as simple as deep sump catch basins, oil-water separators or can be innovative storm water treatment devices. The design of the treatment train and selection of pre-treatment devices by the design engineer is often driven by regulatory requirements. The Inspection Row is recommended by Rainsmart Solutions as an effective means to minimize maintenance requirements and maintenance costs.

Rainsmart® Ellipse Tank O & M Guide Manual for Inspection Row

1 of 6 - GENERAL GUIDELINES / O & M MANUAL

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2.0 Inspection Row Inspection/Maintenance

2.1 INSPECTION

The frequency of Inspection and Maintenance varies by location. A routine inspection schedule needs to be established for each individual location based upon site specific variables. The type of land use (i.e. industrial, commercial residential), anticipated pollutant load, percent imperviousness, climate, etc. all play a critical role in determining the actual frequency of inspection and maintenance practices. At a minimum, Rainsmart Solutions recommends annual inspections. Initially, the Inspection Row should be inspected every 6 months for the first year of operation. For subsequent years, the inspection should be adjusted based upon previous observation of sediment deposition. The Inspection Row incorporates a combination of standard manhole(s) at two (2) ends and strategically located vertical inspection ports over the inspection row (if/as needed). The inspection ports allow for easy access to the system from the surface, eliminating the need to perform a confined space entry for inspection purposes. If upon visual inspection it is found that sediment has accumulated, a stadia rod should be inserted to determine the depth of sediment. When the average depth of sediment exceeds 3 inches throughout the length of the Inspection Row, clean-out should be performed.

2.2 MAINTENANCE

The Inspection Row was designed to reduce the cost of periodic maintenance. By “isolating” sediments to just one row, costs are dramatically reduced by eliminating the need to clean out each row of the entire storage bed which also can create a potential weaker sub-base on the longer run. If inspection indicates the potential need for maintenance, access is provided via 2 manholes located on the either ends of the row for cleanout. If entry into the manhole is required, please follow local and OSHA rules for a confined space entries.

Maintenance is accomplished with the JetVac process. The JetVac process utilizes a high pressure water nozzle to propel itself down the Isolator Row while scouring and suspending sediments. As the nozzle is retrieved, the captured pollutants are flushed out into the manhole for vacuuming. Most sewer and pipe maintenance companies have vacuum/JetVac combination vehicles. Selection of an appropriate JetVac nozzle will improve maintenance efficiency. Fixed nozzles designed for culverts or large diameter pipe cleaning are preferable. Rear facing jets with an effective spread of at least 45” are best. Most JetVac reels have 400 feet of hose allowing maintenance of an Inspection Row up to 160 modules long.


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The JetVac process shall only be performed on Rainsmart Inspection Rows that have non-woven Geotextile (as specified by Rainsmart or greater than 230 gsm) over it.

3.0 Inspection Row Step By Step Maintenance Procedures

STEP 1 Check Inspection Row for sediment

A) Inspection ports (if present)

i) Remove lid from floor box frame ii) Remove cap from inspection riser iii) Using a flashlight and stadia rod, measure depth of sediment and record results on maintenance log. iv) If sediment is at, or above, 3 inch depth proceeds to Step 2. If not proceed to step 3.

B) All of Inspection Rows (if inspection port not Present over the inspection Row) i) Remove cover from manhole at upstream end of Inspection Row ii) Using a flashlight, inspect down Inspection Row through outlet pipe

1. Mirrors on poles or cameras may be used to avoid a confined space entry 2. Follow OSHA regulations for confined space entry if entering manhole

iii) If sediment is at or above the lower row of sidewall holes (approximately 3 inches) proceed to Step 2. If not proceed to Step 3.

STEP 2 Clean out Inspection Row using the JetVac process

A) A fixed culvert cleaning nozzle with rear facing nozzle spread of 45 inches or more is preferable B) Apply multiple passes of JetVac until back flush water is clean C) Vacuum manhole sump as required

STEP 3 Replace all caps, lids and covers, record observations and actions.

STEP 4 Inspect & clean catch basins and manholes upstream of the Rainsmart storage system.


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4.0 Images & Diagrams of 160mm/ 300mm Dia inspection row for Easy Maintenance & Oprations


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Vertical Inspection port over Inspection Row (If required normal 90-150 Dia Pipe)

Manhole to Manhole Linear Inspection (Minimal requirement recommended by Rainsmart Solutions Pty Ltd, please see attached Diagram)


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TOP OF TANK LEVEL

HEAVY DUTY DUCTILE IRONDOUBLE TRIANGULAR SURFACEBOX (OR SIMILAR APROVED), 150x 150 CLEAR OPENING, 100FRAME DEPTH, 1 ON 10 THICKMOTAR BED.

150 x 150 ST4 MASS CONCRETE

90 (or) 160 mm Ø SOLID PVCu DIP PIPE

VENT PIPES TO BE LOCATED INLANDSCAPE AREAS PREFERABLY

TYPICAL 90 (or) 160 mm Ø DIP / VENT PIPE CONNECTION

90 (or) 160 mm Ø PVCu DIP PIPETO ALLOW ACCESS INTO ELLIPSETANK MODULE UNIT FOR CCTVCAMERA ACCESS AND FLUSHINGIF NECESSARY

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RainSmart Ellipse - Tank Installation · ®RainSmart Ellipse Tank Installation 1. Excavation The...

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