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I. <br />. Requirements for Backfilling the System <br /> -� .%,, J II Place the required clean, crushed, angular <br /> +-- YL — ft r stone over the entire bed area as described in <br /> _ ilk== . ,�. ,.' � �, <br /> -`"� i — previous sections. <br /> ' _ 'er_ El Cover the entire installation area with AASHTO <br /> � M288 Class 2 non-woven filter fabric.Take the fabric <br /> — • +-� ;w. ' A from the trench walls and lay it over the top of the <br /> •' �.,.., i; stone. The filter fabric must overlap at least 2 feet <br /> (610 mm)where the edges of the fabric meet. <br /> '� T : 4 ® The first 12 inches (305 mm)of fill material <br /> must meet the requirements of Table 5 on page 10. <br /> • <br /> Backfill over the top of the filter fabric in lifts that <br /> Roll out filter fabric over the angular stone. do not exceed 6 inches(152 mm). Distribute the fill <br /> t s with a construction vehicle that meets the maximum <br /> • _' �' ' ;q++ wheel loads or ground pressure limits specified in <br /> 1 's r Al,,ti -'' '' .: Tables 1 &2 on page 9. <br /> �- 14'= t,' - -_ a Compact each lift of backfill as specified <br /> l -� �., -_- <br /> in the engineer's drawings. StormTech requires <br /> ,:. ;::., '4 compacting to a minimum of 95% of the Standard <br /> i. Proctor density until StormTech's minimum cover <br /> - _ - requirements are met. Use a walk behind or vibra <br /> tory roller not to exceed a maximum gross vehicle <br /> d. - __ . . ?„ weight of 12,000 lbs(53 kN) and a maximum <br /> Y, . .1, dynamic force of 20,000 lbs (89 kN). <br /> V <br /> Y 4 t ya <br /> Once StormTech's minimum cover require- <br />,. Backfill the bed using an acceptable fill material. ments are met, continue to backfill over the <br /> --- chamber bed until the specified grade is achieved. <br /> i,� ijt '- "! StormTech's cover requirements are 18" (457 mm) <br /> 7. ►r, � minimum and 96" (2438 mm) maximum over the <br /> p ir-1 fl i Eifuif1 1 'I i[!Mt i' l ut. it -` top of the chambers. For pavement sub-base or <br /> :- j F .4 _ I. special fill requirements, see engineer's drawings. <br /> • <br /> - .. • - • <br /> The backfill height differential should never differ <br /> ,am __ • _ - by more than 2 feet(610 mm) over adjacent <br /> .. -. chambers. Minimum cover heights must be met <br /> - before vehicles are allowed on top of the system. <br /> - Large rocks and organic matter such as roots, <br /> stumps, etc, must not be part of the backfill <br /> -_ - M '` ` material. Refer to Table 5 on page 10 for Accept- <br /> Continue to backfill the chamber bed. able Cover Materials or contact the design <br /> engineer for approved fill types. <br />• <br /> 8 Call StormTech at 888.892.2694 for technical and product information or visit www.stormtech.com. 49 <br />