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TIE ISOLATOR° ROW 111 INTRODUCTION An important component of any Stormwater Pollution Prevention Plan is inspection and maintenance.The StormTech Isolator Row is a technique to inexpensively enhance Total Suspended Solids(TSS)and Total Phosphorus(TP)removal with easy access for inspection and maintenance. THE ISOLATOR ROW The Isolator Row is a row of StormTech chambers,either SC-160,SC- 310,SC-310-3,SC-740, DC-780, MC-3500 or MC-4500 models,that is Looking down the Isolator Row from the surrounded with filter fabric and connected to a closely located manhole manhole opening,woven geotextile is shown for easy access.The fabric-wrapped chambers provide for settling between the chamber and stone base. and filtration of sediment as storm water rises in the Isolator Row and ultimately passes through the filter fabric.The open bottom chambers _ and perforated sidewalls(SC-310,SC-310-3 and SC-740 models)allow storm water to flow both vertically and horizontally out of the chambers. �_ Sediments are captured in the Isolator Row protecting the storage areas . + of the adjacent stone and chambers from sediment accumulation. r A woven geotextile fabric is placed between the stone and the Isolator Row chambers.The woven geotextile provides a media for stormwater _ filtration,a durable surface for maintenance,prevents scour of the underlying stone and remains intact during high pressure jetting.A non- — s.-, A, , __woven fabric is placed over the chambers to provide a filter media for flows passing through the perforations in the sidewall of the chamber. - �.. The non-woven fabric is not required over the SC-160, DC-780, MC-3500 '". 0 ,. `" '' or MC-4500 models as these chambers do not have perforated side * ' walls. The Isolator Row is typically designed to capture the"first flush"and StormTech Isolator Row with offers the versatility to be sized on a volume basis or flow rate basis. Overflow Spillway(not to scale) An upstream manhole provides access to the Isolator Row and OPTIONAL typically includes a high flow weir. When flow rates or volumes exceed PRE-TREATMENT the Isolator Row weir capacity the water will flow over the weir and discharge through a manifold to the other chambers. sORMT ow Another acceptable design uses one open grate inlet structure. Using ,�� a "high/low"design(low invert elevation on the Isolator Row and a higher _` RangliBli) >'' 1 invert elevation on the manifold)an open grate structure can provide the "'A"wr� = 11��1 advantages of the Isolator Row by creating a differential between the ° 'waa = ��e p Y Isolator Row and manifold thus allowing for settlement in the Isolator Row. = --111 p The Isolator Row may be part of a treatment train system.The design MIMI, p of the treatment train and selection of pretreatment devices by the ECCENTRIC — --liL ) design engineer is often driven by regulatory requirements.Whether HEADER --ell D pretreatment is used or not,the Isolator Row is recommended by _ --eY StormTech as an effective means to minimize maintenance requirements = --I} D and maintenance costs. Note:See the StormTech Design Manual for detailed information on T. 111111111- D designing inlets for a StormTech system, including the Isolator Row. °co AL , STORM TECH CHAMBERS THE MOST ADVANCED NAME IN WATER MANAGEMENT SOLUTIONS" 2