J_2024 05 09_West Orange Stormwater Management Plan

Aqua-Swirl™ Installation Routine installation steps for the Aqua-Swirl™ units involve preparation and excavation of the area that is to contain the Aqua-Swirl™. This includes grading, leveling, and compacting the base material before lowering the unit into the excavation and connecting the Aqua-Swirl™ inlet and outlet stub-outs with appropriate pipe couplings. Prior to shipping, the purchasing contractor provides written confirmation to install AquaShield™ products in accordance with manufacturer's specifications. Step 1 — Excavation and Bedding The trench and trench bottom shall be constructed in accordance with ASTM D 2321, 6, Trench Excavation, and Section 7, Installation. The excavation pit is best positioned slightly offset of the center line of the incoming drain pipe trench because of the tangential inlet pipe connecting to the Aqua-Swirl™. m The Aqua-Swirl™ shall be installed on a stable base consisting of 12 inches of Class I stone materials (angular, crushed stone or rock, crushed gravel; large void content, containing little or no fines) as defined by ASTT'1 D 2321, Section 5, Materials; and, compacted to 95% proctor density. All required safety precautions for AquaSwirl™ installation are the responsibility of the contractor. •> m On-site excavation Step 2 - Pipe Connection Devices Couplings to and from the Aqua-Swirl™ shall be supplied by the contractor and shall be Fernco®, Mission™ or equal type flexible boot with stainless steel tension bands or equal. Using a metal sheer guard will protect the flexible connector. i* . V •-tv 4"; ,.r§."* "£>■ So' The coupling between the AquaSwirl™ and the pipe

Step 3 - Backfill Requirements Backfill materials shall be Class I or II stone materials, (well graded gravels, gravelly sands; content, 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 shall extend at least 3.5 feet beyond the edge of the Aqua-Swirl™ and for the full height to sub-grade and extend laterally to undisturbed soils. • • ir , y- ■it Class I backfill material around the Aqua-Swirlm 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 Aqua-Swirl™ 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™. 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 between the HDPE access riser and cast iron frame. A reinforced concrete pad for H-20 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.

Aqua-Filter™ Installation Normal installation steps for the Aqua-Filter™ units involve preparation and excavation of the area that is to contain the AquaFilter™. This includes grading, leveling and compacting the base material before lowering the unit into the excavation and connecting the Aqua-Filter™ inlet and outlet stub-outs with appropriate pipe couplings. Prior to shipping, the purchasing contractor provides written confirmation to install AquaShield™ products in accordance with manufacturer's specifications. mL? .s ■ mm An Aqua-Fitter171 system ready to be installed Step 1 - Excavation and Bedding The trench and trench bottom shall be constructed in accordance with ASTM D 2321, Section 6, Trench Excavation, and Section 7, Installation. The HDPE filtration system shall be installed on a stable base consisting of 12-inches of Class I stone materials (angular, crushed stone or rock, crushed gravel; large void content, containing little or no fines) as defined by ASTM D 2321, Section 5, Materials, and compacted to 95% proctor density. Additional bedding shall be tamped around the "under-center" of the filter chamber up to the springline to provide adequate support. All required safety precautions for the system installation are the responsibility of the contractor. Step 2 - Pipe Connection Devices Couplings to and from the Aqua-Filter™ shall be supplied by the contractor and shall be Fernco®, Mission™ or equal type flexible boot with stainless steel tension bands or equal. A metal sheer guard should be used when available. The manufacturer shall supply the coupling to connect the Aqua-Swirl™ to the filtration chamber. The coupling between the AquaSwirl”1 and the filtration chamber of the Aqua-Filter171 system

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.

gg AquaShield™ Product System Maintenance The long-term performance of the stormwater treatment structures (including manufactured systems, ponds, swales, etc.), and the effective protection of receiving waters, depends on a consistent maintenance plan. Inspection and maintenance functions are simple and easy for the AquaShield™ Stormwater Treatment Systems allowing all inspections to be performed from the surface. An AquaShield™ field representative will be available as needed to assist local maintenance personnel in the field. Please contact us for a copy of a product-specific "Inspection and Maintenance Manual". It is important that a routine inspection and maintenance program be established for each unit based on (1) the volume or load of the contaminants of concern, (2) the frequency of releases of contaminants at the facility or location, and (3) the nature of the area being drained. In order to ensure that our systems are being maintained properly, AquaShield™ offers a maintenance solution to all of our customers. We have to arrange will maintenance performed. JK>S »&v-. .»■ - .M -v •v. MfP

Inspection All AquaShield™ products can be inspected from the surface, eliminating the need to enter the systems to determine when cleanout should be performed. In most cases, AquaShield™ recommends a quarterly inspection of the Stormwater Treatment Systems for the first year of operation to develop an appropriate schedule of maintenance. Based on experience of the system's first year in operation, we recommend that the inspection schedule be revised to reflect the site-specific conditions encountered. Typically, the inspection schedule for subsequent years is reduced to semi-annual inspection. Aqua-Swirl™ Maintenance The Aqua-Swirl™ has been designed to minimize and simplify the inspection and maintenance process. The system can be inspected and maintained completely from the surface, thereby eliminating the need for confined space entry. Furthermore, the entire structure (specifically, the floor) is accessible for visual inspection from the surface. There are no areas of the structure that are blocked from visual inspection or periodic cleaning. Inspection of any free-floating oil and floatable debris can be directly observed and maintained through the manhole access provided directly over the swirl chamber. Aqua-Swirl™ Inspection Procedure ■ m To inspect the Aqua-Swirl™, a hook is needed to remove the manhole cover. AquaShield™ provides a customized manhole cover with our logo to make it easy for maintenance crews to locate the system in the field. We also provide a permanent metal information plate attached inside the access riser, which provides our contact information, the Aqua-Swirl™ model size, and serial number. } . j; t-jA '• •• i *■* <■ Sediment Inspection using a stadia rod

The only tools needed to inspect the Aqua-Swirl™ system are a flashlight and a measuring device such as a stadia rod or pole. Given the tremendous accessibility provided, floating oil and debris can be observed directly from the surface. Sediment depths can easily be determined by lowering a measuring device to the top of the sediment pile and to the surface of the water. When the sediment pile is within 30 to 36 inches of the water surface, the system should be maintained. m r'v It should be noted that in order to avoid underestimating the volume of sediment in the chamber, the measuring device must be carefully lowered to the top of the sediment pile. The finer sediment at the top of the pile, typically offers less resistance to the measuring device than the larger particles. Aqua-Swirl™ Cleanout Procedure Clean out of the Aqua-Swirl™ is simple. Free-floating oil and floatable debris can be observed and removed directly through the 30-inch service access provided. A vacuum truck can be used to remove the accumulated sediment and debris. It is important to note that the entire sediment storage area can be reached with a vacuum hose from the surface (reaching all the sides). Disposal of the material is typically treated in the same fashion as catch basin cleanouts. AquaShield™ recommends that all materials removed be handled and disposed of in accordance with local and state requirements. Vacuum truck deans the Aqua-Swirlm Inspection Data Sheets are provided in the Appendix of this Manual.

(gf Aqua-Filter™ Maintenance Proper maintenance of the Aqua-Filter™ system is needed for the unit to operate efficiently. Typically, inspection of the Aqua-Swirl™ pretreatment chamber and the filtration chamber should be performed on a quarterly basis. Information gathered during the first year of service can be used to create a maintenance plan appropriate for the site. Aqua-Swirl™ Pretreatment Chamber The Aqua-Swirl™ is easily inspected from the surface. Floating debris and free oil can be observed along with the captured stormwater by removing the manhole cover. Sediment depth is determined by lowering a measuring device (e.g. stadia rod) to the top of the sediment pile. When the sediment pile is within 30 to 36 inches from the water surface, cleaning is required. Typically, a vacuum truck is used to first remove the captured no^bia debris in the Aqua-swift™ floating materials from the water's surface before lowering the vac-hose into the accumulated sediment pile for its removal. - 4 ... ;v * . ... » . *( For more detail regarding the inspection and maintenance of the pretreatment chamber, please see the previous Section on the Aqua-Swiri™ Inspection and Maintenance. Aqua-Filter™ Filtration Chamber The filter media is also easily observed from the surface. Manhole covers are spaced over the entire filtration bed to provide easy access. AquaShield™ provides a customized manhole cover with our logo to make it easy for maintenance crews to locate the system in the field.

Initially, the filter media is light tan or white in color. When the media color turns black, it has become saturated due to pollutant loading and requires replacement. Call toll free (888) 344-9044 to order replacement filters. An entry riser provides direct access into the filtration chamber with a permanent ladder welded into the downstream section of the chamber. This additional access allows for the vacuuming of any standing water and an unobstructed walkway to the downstream side of the filter bed. A permanent ladder provides access to filter chamber Replacement of the filtration media typically requires entry into the filtration chamber by one of a twomember maintenance crew. Confined space entry precautions should be taken by the maintenance crew when removing and replacing the filters. The spent filter containers are normally retrieved from the filter chamber by a second crewmember at the surface through the multiple 30-inch risers spaced across the top of the filter bed. In addition, the filter containers can be accessed directly from within the filtration chamber via a vertical removable panel at the rear of the filter bed. The center row of the filtration bed has been fitted with one inch thick removable fiberglass grate panels. This allows for a six-foot tall walkway down the center of the chamber, providing easy access to the full length of the filtration chamber. Rows of removable side grates are positioned on both sides of the center row. After the center grate panel has been removed, the filter media can be lifted from these side grate panels. gwrsaws ~. t y_ r : After the removable sides have been loaded Grata panels (shown) or cargo netting with replacement filter containers, the cover the filter media removable center grates are repositioned and locked in place. New filters are installed in a criss-cross manner to prevent short-circuiting (see Appendix).

Filter Media Disposal The filter media does not allow captured contaminants to be released once absorbed into the material. This is a unique quality of the Aqua-Filter™, allowing superior performance under extreme conditions. The spent filters and sediment generally do not require any special treatment or handling for disposal. The filtration media canbe recycled as fuel material, or sent to a subtitle D landfill. AquaShield™ recommends that all materials removed during the maintenance process be handled and disposed of in accordance with local and state requirements. Spent filter media can be recycled or sent to a landfill Inspection Data Sheets are provided in the Appendix oh this Manual\