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Isolator Row O&M Manual - StormTech

Isolator Row O&M ManualStormTech Chamber System for Stormwater ManagementSave Valuable Land andProtect Water ResourcesDetention Retention Water QualityA division important component of any Stormwater PollutionPrevention Plan is inspection and maintenance. TheStormTech Isolator Row is a patented technique toinexpensively enhance Total Suspended Solids (TSS)removal and provide easy access for inspection Isolator ROW The Isolator Row is a row of StormTech chambers, eitherSC-310, SC-310-3, SC-740, DC-780, MC-3500 or MC-4500 models, that is surrounded with filter fabric and con-nected to a closely located manhole for easy access. Thefabric-wrapped chambers pro vide for settling and filtra-tion of sediment as storm water rises in the Isolator Rowand ultimately passes through the filter fabric. The openbottom chambers and perforated sidewalls (SC-310, SC-310-3 and SC-740 models) allow storm water to flow bothvertically and horizon tally out of the are cap tured in the Isolator Row protectingthe storage areas of the adjacent stone and chambersfrom sediment different fabrics are used for the Isolator Row.

Isolator ® Row O&M Manual StormTech ® Chamber System for Stormwater Management Save Valuable Land and Protect Water Resources Detention • Retention • Water Quality A division of

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Transcription of Isolator Row O&M Manual - StormTech

1 Isolator Row O&M ManualStormTech Chamber System for Stormwater ManagementSave Valuable Land andProtect Water ResourcesDetention Retention Water QualityA division important component of any Stormwater PollutionPrevention Plan is inspection and maintenance. TheStormTech Isolator Row is a patented technique toinexpensively enhance Total Suspended Solids (TSS)removal and provide easy access for inspection Isolator ROW The Isolator Row is a row of StormTech chambers, eitherSC-310, SC-310-3, SC-740, DC-780, MC-3500 or MC-4500 models, that is surrounded with filter fabric and con-nected to a closely located manhole for easy access. Thefabric-wrapped chambers pro vide for settling and filtra-tion of sediment as storm water rises in the Isolator Rowand ultimately passes through the filter fabric. The openbottom chambers and perforated sidewalls (SC-310, SC-310-3 and SC-740 models) allow storm water to flow bothvertically and horizon tally out of the are cap tured in the Isolator Row protectingthe storage areas of the adjacent stone and chambersfrom sediment different fabrics are used for the Isolator Row.

2 Awoven geotextile fabric is placed between the stoneand the Isolator Row chambers. The tough geo textileprovides a media for storm water filtration and providesa durable surface for maintenance operations. It is alsodesigned to prevent scour of the underlying stone andremain intact during high pressure jetting. A non-wovenfabric is placed over the chambers to provide a filtermedia for flows passing through the perforations in thesidewall of the chamber. The non-woven fabric is notrequired over the DC-780, MC-3500 or MC-4500 modelsas these chambers do not have perforated side StormTech at visit our website at technical and product information. The Isolator RowThe Isolator Row is typically designed to capture the first flush and offers the versatility to be sized on a vol-ume basis or flow rate basis. An upstream manhole notonly provides access to the Isolator Row but typicallyincludes a high flow weir such that storm water flowratesor volumes that exceed the capacity of the Isolator Rowovertop the over flow weir and discharge through amanifold to the other chambers.

3 The Isolator Row may also be part of a treatment treating storm water prior to entry into the chambersystem, the service life can be extended and pollutantssuch as hydrocarbons can be captured. Pre-treatmentbest management practices can be as simple as deepsump catch basins, oil-water separators or can be inno-vative storm water treatment devices. The design of the treatment train and selection of pretreatment devicesby the design engineer is often driven by regulatoryrequirements. Whether pretreatment is used or not, theIsolator Row is recommended by StormTech as aneffective means to minimize maintenance requirementsand maintenance : See the StormTech Design Manual for detailedinformation on designing inlets for a StormTech system,including the Isolator STORMTECHISOLATOR ROWOPTIONAL PRE-TREATMENTOPTIONAL ACCESSSTORMTECH CHAMBERSS tormTech Isolator Row with Overflow Spillway (not to scale)Looking down the Isolator Row from the manhole opening, wovengeotextile is shown between the chamber and stone Isolator Row Inspection/MaintenanceCall StormTech at visit our website at technical and product information.

4 3 Maintenance is accomplished with the JetVac JetVac process utilizes a high pressure water noz-zle to propel itself down the Isolator Row while scouringand suspending sediments. As the nozzle is retrieved,the captured pollutants are flushed back into the man-hole for vacuuming. Most sewer and pipe maintenancecompanies have vacuum/JetVac combination of an appropriate JetVac nozzle will improvemaintenance efficiency. Fixed nozzles designed for cul-verts or large diameter pipe cleaning are facing jets with an effective spread of at least 45 are best. Most JetVac reels have 400 feet of hose allow-ing maintenance of an Isolator Row up to 50 chamberslong. The JetVac process shall only be performed onStormTech Isolator Rows that have AASHTO class 1woven geotextile (as specified by StormTech ) overtheir angular base frequency of Inspection and Maintenance varies by location. A routine inspection schedule needs to beestablished for each individual location based upon sitespecific variables.

5 The type of land use ( industrial,commercial, residential), anticipated pollutant load, per-cent imperviousness, climate, etc. all play a critical rolein determining the actual frequency of inspection andmaintenance a minimum, StormTech recommends annual inspec-tions. Initially, the Isolator Row should be inspected every6 months for the first year of operation. For sub sequentyears, the inspection should be adjusted based uponprevious observation of sediment deposition. The Isolator Row incorporates a combination of standardmanhole(s) and strategically located inspection ports(as needed). The inspection ports allow for easy accessto the system from the surface, eliminating the need toperform a confined space entry for inspection purposes. If upon visual inspection it is found that sediment hasaccumulated, a stadia rod should be inserted to deter-mine the depth of sediment. When the average depth of sediment exceeds 3 inches throughout the length of the Isolator Row, clean-out should be MAINTENANCEThe Isolator Row was designed to reduce the cost ofperiodic maintenance.

6 By isolating sediments to justone row, costs are dramatically reduced by eliminatingthe need to clean out each row of the entire storagebed. If inspection indicates the potential need for main-tenance, access is provided via a manhole(s) locatedon the end(s) of the row for cleanout. If entry into themanhole is required, please follow local and OSHA rulesfor a confined space entries. StormTech Isolator Row (not to scale)Examples of culvert cleaning nozzles appropriate for Isolator Rowmaintenance. (These are not StormTech products.)NOTE:NON-WOVEN FABRIC IS ONLY REQUIRED OVER THE INLET PIPE CONNECTION INTO THE END CAP FOR DC-780, MC-3500 ANDMC-4500 CHAMBER MODELS AND IS NOT REQUIRED OVER THE ENTIRE Isolator 1)Inspect Isolator Row for sedimentA) Inspection ports (if present)i. Remove lid from floor box frameii. Remove cap from inspection riseriii. Using a flashlight and stadia rod,measure depth of sediment andrecord results on maintenance If sediment is at, or above, 3 inchdepth proceed to Step 2.

7 If notproceed to step ) All Isolator Rowsi. Remove cover from manhole atupstream end of Isolator Row ii. Using a flashlight, inspect down Isolator Row through outlet on poles or cameras may be used to avoid a confined space OSHA regulations for confined space entry if entering manholeiii. 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 Isolator Row using the JetVac processA) A fixed culvert cleaning nozzle with rear facing nozzle spread of 45 inches or more is preferableB) Apply multiple passes of JetVac until backflush water is cleanC) Vacuum manhole sump as requiredStep 3) Replace all caps, lids and covers, record observations and actionsStep 4)Inspect & clean catch basins and manholes upstream of the StormTech systemADS Terms and Conditions of Sale are available on the ADS website, Drainage Systems, the ADS logo, and the green stripe are registered trademarks of Advanced Drainage and the Isolator Row are registered trademarks of StormTech , Building Council Member logo is a registered trademark of the Green Building Council.

8 2013 Advanced Drainage Systems, Inc. SO90809 02 Isolator Row Step By Step Maintenance Procedures421) B)1) A) StormTech Isolator Row (not to scale)Stadia Rod ReadingsFixed pointFixed pointSedimentDateto chamberto top ofDepthObservations/ActionsInspectorbott om (1)sediment (2)(1) - (2)3/15 installation. Fixed point is Cl frame at gradedjm9/24 grit feltsm6/20 feel, debris visible in manhole and inrvIsolator row, maintenance due7/7 jetted and vacuumeddjmSample Maintenance Log70 Inwood Road, Suite 3 Rocky Hill Connecticut 06067 fax Detention Retention Water QualityA division of


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