J_2024 05 09_West Orange Stormwater Management Plan

Step 3 - Backfill Requirements Backfill materials shall be Class I or II stone materials, (well graded gravels, gravelly sands; containing little or no fines) as defined by ASTM D 2321, Section 5, Materials, and compacted to 90% proctor density. Class I materials are preferred. Backfill and bedding materials shall be free of debris. Backfilling shall conform to ASTM F 1759, Section 4.2, "Design Assumptions". Backfill u Class I backfill surrounding the Aqua-Filter™ system shall extend at least 3.5 feet beyond the edge of the stormwater filtration system and for the full height to sub-grade and extend laterally to undisturbed soils. Sufficient backfill shall be placed over components prior to using heavy compaction or construction equipment to prevent damage. Support shall be provided for vertical risers as commonly found at service connections, cleanouts, and drop manholes to preclude vertical or lateral movement. Step 4 - Traffic Loading A reinforced concrete pad shall be placed over the entire system when subject to H-20 (or greater) traffic loading. The pad shall extend no less than 12 inches beyond the outside diameter of the Aqua-Swirl™ and filtration chamber on all sides. A professional engineer shall provide final approval of the design of the concrete pad and the calculations must be included in the submittal. Traffic rated foundry rims and covers shall be installed such that no contact is made with access risers. The installation of a reinforced concrete pad for H20 traffic loading Step 5 - Non-Traffic Loading Bollards shall be placed around access risers in non-traffic areas to prevent inadvertent loading by maintenance vehicles.