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Itorra <br /> Installation <br /> ' A. Do not sum place in a condition. The Filterra®cannot be used as an inlet—it will <br /> p <br /> need effective bypass during higher intensity rainfall events. Refer to Drawing GU1 <br /> ' Grading&Gutter Flow. To test a proposed location,imagine the Filterra®throat is <br /> completely blocked(so it would act like typical curb and gutter). If this results in any <br /> ponding or pooling of drainage,the placement is inappropriate. If the drainage <br /> ' continues to flow by the blocked Filterra®throat to the bypass inlet(or other relief) <br /> without any ponding or pooling,the placement is appropriate. <br /> ' B. Each unit shall be constructed at the locations and elevations according to the sizes <br /> shown on the approved drawings. Any modifications to the elevation or location <br /> shall be at the direction of and approved by the Engineer. <br /> ' C. The unit shall be placed on a compacted sub-grade with a minimum 6-inch gravel <br /> base matching the final grade of the curb line in the area of the unit. The unit is to be <br /> ' placed such that the unit and top slab match the grade of the curb in the area of the <br /> unit. Compact undisturbed sub-grade materials to 95%of maximum density at+1- <br /> 2%of optimum moisture. Unsuitable material below sub-grade shall be replaced to <br /> site engineer's approval.Filterra®Weights and Lifting Details are shown within this <br /> document. <br /> D. Once the unit is set,the internal wooden forms and protective mesh cover must be left <br /> ' intact. The top lid should be sealed onto the box section before backfilling,using a <br /> non-shrink grout,butyl rubber or similar waterproof seal. The boards on top of the <br /> lid and boards sealed in the unit's throat must NOT be removed. The Supplier will <br /> ' remove these sections at the time of activation. <br /> E. Outlet connections shall be aligned and sealed to meet the approved drawings with <br /> modifications necessary to meet site conditions and local regulations. <br /> 1performed in a careful manner,bringing appropriate fill <br /> F. Backfilling should be g g the <br /> material up in 6"lifts on all sides. Precast sections shall be set in a manner that will <br /> result in a watertight joint. In all instances,installation of the Filterra®unit shall <br /> conform to ASTM specification C891 "Standard Practice for Installation of <br /> Underground Precast Utility Structures"unless specified otherwise in contract <br /> ' documents. <br /> G. It is the responsibility of the Contractor to provide curb and gutter and transition to <br /> ' the Filterra®unit for proper stormwater flow into the system through the throat <br /> opening.A standard drawing of the throat and gutter detail(Drawing CGT-01) <br /> follows this page,however the plans and contract documents supersede all standard <br /> ' drawings.Effective bypass for the Filterra®system is essential for correct operation <br /> (i.e.bypass to an overflow at lower elevation). <br /> 12/15/04 www.filterra.com <br />