complete drainage report rev 9

Introduction Thank you for your purchase of the Filterra® HC Bioretention System. Filterra HC is a specially engineered stormwater treatment system incorporating high performance biofiltration media to remove pollutants from stormwater runoff. All components of the system work together to provide a sustainable long-term solution for treating stormwater runoff. The Filterra HC system has been delivered to you with protection in place to resist intrusion of construction related sediment which can contaminate the biofiltration media and result in inadequate system performance. These protection devices are intended as a best practice and cannot fully prevent contamination. It is the purchaser’s responsibility to provide adequate measures to prevent construction related runoff from entering the Filterra HC system. Included with your purchase is Activation of the Filterra HC system by the manufacturer as well as a 1-year warranty from delivery of the system and 1-year of routine maintenance (mulch replacement, debris removal, and pruning of vegetation) up to twice during the first year after activation. Design and Installation Each project presents different scopes for the use of Filterra HC systems. Information and help may be provided to the design engineer during the planning process. Correct Filterra HC box sizing (per local regulations) is essential to predict pollutant removal rates for a given area. The engineer shall submit calculations for approval by the local jurisdiction. The contractor is responsible for the correct installation of Filterra HC units as shown in approved plans. A comprehensive installation manual covering all Filterra configurations is available at www.ContechES.com. Activation Overview Activation of the Filterra HC system is a procedure completed by the manufacturer to place the system into working condition. This involves the following items: * Removal of construction runoff protection devices * Planting of the system's vegetation * Placement of pretreatment mulch layer using mulch certified for use in Filterra HC systems. Activation MUST be provided by the manufacturer to ensure proper site conditions are met for Activation, proper installation of the vegetation, and use of pretreatment mulch certified for use in Filterra HC systems. 4 www.ContechES.com/filterra | 800-338-1122

Minimum Requirements The minimum requirements for Filterra HC Activation are as follows: 1.The site landscaping must be fully stabilized, i.e. full landscaping installed and some grass cover (not just straw and seed) is required to reduce sediment transport. Construction debris and materials should be removed from surrounding area. 2.Final paving must be completed. Final paving ensures that paving materials will not enter and contaminate the Filterra HC system during the paving process, and that the plant will receive runoff from the drainage area, assisting with plant survival for the Filterra HC system. 3.Filterra HC throat opening (if applicable) should be at least 4” in order to ensure adequate capacity for inflow and debris. 4" MIN CLEAR THROAT OPENING THROAT PROTECTION DEVICE DO NOT REMOVE - LEAVE IN PLACE UNTIL SITE IS STABILIZED AND FILTERRA IS ACTIVATED CAST-IN-PLACE GUTTER AND THROAT OPENING (BY CONTRACTOR PER LOCAL STANDARDS) An Activation Checklist is included on page 12 to ensure proper conditions are met for Contech to perform the Activation services. A charge of $500.00 will be invoiced for each Activation visit requested by Customer where Contech determines that the site does not meet the conditions required for Activation. www.ContechES.com/filterra | 800-338-1122 5

Filterra HC Plant Selection Overview Plant Lists are available on the Contech website highlighting recommended plants for Filterra systems in your area. Keep in mind that plants are subject to availability due to seasonality and required minimum size for the Filterra HC system. Plants installed in the Filterra HC system are container plants (max 15 gallon) from nursery stock and will be immature in height and spread at Activation. It is the responsibility of the owner to provide adequate irrigation when necessary to the plant of the Filterra HC system. The “Planting Requirements for Filterra HC Systems” document is included as an appendix and discusses proper selection and care of the plants within Filterra HC systems. Warranty Overview Refer to the Contech Engineered Solutions LLC Stormwater Treatment System LIMITED WARRANTY for further information. The following conditions may void the Filterra HC system's warranty and waive the manufacturer provided Activation and Maintenance services: * Unauthorized activation or performance of any of the items listed in the activation overview * Any tampering, modifications or damage to the Filterra HC system or runoff protection devices * Removal of any Filterra HC system components * Failure to prevent construction related runoff from entering the Filterra HC system * Failure to properly store and protect any Filterra HC components (including media and underdrain stone) that may be shipped separately from the vault Routine Maintenance Guidelines Routine maintenance is included by the manufacturer on all Filterra HC systems for the first year after activation. This includes a maximum of 2 visits to remove debris, replace pretreatment mulch, and prune the vegetation. More information is provided in the Operations and Maintenance Guidelines. Some Filterra HC systems also contain diversion bypass or outlet bays. Depending on site pollutant loading, these bays may require periodic removal of debris, however this is not included in the first year of maintenance and would likely not be required within the first year of operation. These services, as well as routine maintenance outside of the included first year, can be provided by certified maintenance providers listed on the Contech website. Training can also be provided to other stormwater maintenance or landscape providers. 6 www.ContechES.com/filterra |

can be provided by certified maintenance providers listed on the Contech website. Training can also be provided to other stormwater maintenance or landscape providers. 6 www.ContechES.com/filterra | 800-338-1122

Why Maintain? All stormwater treatment systems require maintenance for effective operation. This necessity is often incorporated in your property's permitting process as a legally binding BMP maintenance agreement. Other reasons to maintain are: * Avoiding legal challenges from your jurisdiction’s maintenance enforcement program. * Prolonging the expected lifespan the media in the Filterra HC system. * Avoiding more costly media replacement. * Helping reduce pollutant loads leaving your property. Simple maintenance of the Filterra HC is required to continue effective pollutant removal from stormwater runoff before discharge into downstream waters. This procedure will also extend the longevity of the living biofilter system. The Filterra HC system is also subjected to various materials entering the inlet, including trash, silt, leaves, etc. which will be contained above the mulch layer. Too much silt may inhibit the Filterra HC system flow rate, which is the reason for site stabilization before activation. Regular replacement of the mulch stops accumulation of such sediment. If the system is not maintained on regular intervals, is subject to a catastrophic spill or other event, or subject to unusual pollutant loading, full media bed replacement could be required. Please contact Contech for further evaluation if you feel this may be necessary. When to Maintain? Contech includes a 1-year maintenance plan with each system purchase. Annual included maintenance consists of a maximum of two (2) scheduled visits. Additional maintenance may be necessary depending on sediment and trash loading (by Owner or at additional cost). The start of the maintenance plan begins when the system is activated. Maintenance visits are scheduled seasonally; the spring visit aims to clean up after winter loads including salts and sands while the fall visit helps the system by removing excessive leaf litter. It has been found that in regions which receive between 30-50 inches of annual rainfall, (2) two visits are generally required; regions with less rainfall often only require (1) one visit per annum. Varying land uses can affect maintenance frequency; e.g. some fast food restaurants require more frequent trash removal. Contributing drainage areas which are subject to new development wherein the recommended erosion and sediment control measures have not been implemented

estaurants require more frequent trash removal. Contributing drainage areas which are subject to new development wherein the recommended erosion and sediment control measures have not been implemented may require additional maintenance visits. Some sites may be subjected to extreme sediment or trash loads, requiring more frequent maintenance visits. This is the reason for detailed notes of maintenance actions per unit, helping the Supplier and Owner predict future maintenance frequencies, reflecting individual site conditions. Owners must promptly notify the (maintenance) Supplier of any damage to the plant(s), which constitute(s) an integral part of the bioretention technology. Owners should also advise other landscape or maintenance contractors to leave all maintenance to the Supplier (i.e. no pruning or fertilizing) during the first year. www.ContechES.com/filterra | 800-338-1122 7

Exclusion of Services Clean up due to major contamination such as oils, chemicals, toxic spills, etc. will result in additional costs and are not covered under the Supplier maintenance contract. Should a major contamination event occur the Owner must block off the outlet pipe of the Filterra HC (where the cleaned runoff drains to, such as drop inlet) and block off the inlet of the Filterra HC. The Supplier should be informed immediately. Maintenance Visit Summary Each maintenance visit consists of the following simple tasks (detailed instructions below). . Inspection of Filterra HC and surrounding area . Removal of tree grate and erosion control stones Removal of debris, trash and mulch Mulch replacement . Plant health evaluation & pruning or replacement as necessary . Clean area around Filterra HC . Complete paperwork NQOORWNH Available Maintenance Tools, Safety Equipment and Supplies Ideal tools include camera, bucket, shovel, broom, pruners, hoe/rake, and tape measure. Appropriate Personal Protective Equipment (PPE) should be used in accordance with local or company procedures. This may include impervious gloves where the type of trash is unknown, high visibility clothing and barricades when working near traffic and also safety hats and shoes. A T-Bar or crowbar should be used for moving the tree grates (up to 170 lbs ea.). Most visits require minor trash removal and a full replacement of mulch. See below for actual number of bagged mulch that is required in each media bay size. Mulch should be a double shredded, hardwood variety. Some visits may require additional Filterra engineered soil media for the Filterra HC system, available from the Supplier. Mulch Bags 4x4 4 2 4x6 or 6x4 6 3 % | 4.5x7.83 or 7.83x4.5 (Nominal 4x8/8x4) 9 5 3 a 6x6 9 5 oS 6x8 or 8x6 12 6 5 2s 6x10 or 10x6 15 8 E o§ 6x12 or 12x6 18 9 Pir 7x13 or 13x7 1 23 12 ic mel ge 14x8 112 28 14 55 ae 16x8 128 32 16 2 18x8 144 36 18 20x8 160 40 20 22x8 176 44 22 4x4 16 4 2 4.5x5.83 or 5.83x4.5 (Nominal 4x6/6x4) 26.24 7 4 62 6x6 36 9 5 35 os 6x8 48 12 6 ae 25 6x10 or 10x6 60 15 8 et 7x10 70 18 9 8x10.5 84 21 u 8x12.5 100 25 13 Custom and/or Filterra Bioscape Media Area in fi2 | 0-25 (Media Area | 0.125 x (Media Area in f?) in f?) 8 www.ContechES.com/filterra | 800-338-1122

Maintenance Visit Procedure Keep sufficient documentation of maintenance actions to predict location specific maintenance frequencies and needs. An example Maintenance Report is included in this manual. 1. Inspection of Filterra HC and surrounding area * Record individual unit before maintenance with photograph (numbered). Record on Maintenance Report (see example in this document) the following: Record on Maintenance Report the following: Standing Water yes | no Damage to Box Structure yes | no Damage to Grate yes | no Is Bypass Clear yes | no If yes answered to any of these observations, record with close-up photograph (numbered). 2. Removal of tree grate and erosion control stones * Remove cast iron grates for access into Filterra HC box. * Dig out silt (if any) and mulch and remove trash & foreign items. == 3. Removal of debris, trash and mulch Record on Maintenance Report the following: Silt/Clay yes | no Cups/ Bags yes | no Leaves yes | no Buckets Removed * After removal of mulch and debris, measure distance from the top of the Filterra engineered media soil to the top of the top slab. Compare the measured distance to the distance shown on the approved Contract Drawings for the system. Add Filterra media (not top soil or other) to bring media up as needed to distance indicated on drawings. Record on Maintenance Report the following: Distance to Top of Top Slab (inches) Inches of Media Added www.ContechES.com/filterra | 800-338-1122

j 4. Mulch replacement * Add double shredded mulch evenly across the entire unit to a depth of 3”. * Refer to Filterra Mulch Specifications for information on acceptable sources. * Ensure correct repositioning of erosion control stones by the Filterra HC inlet to allow for entry of trash during a storm event. * Replace Filterra HC grates correctly using appropriate lifting or moving tools, taking care not to damage the plant. 5. Plant health evaluation and pruning or replacement as necessary * Examine the plant’s health and replace if necessary. * Prune as necessary to encourage growth in the correct directions Record on Maintenance Report the following: Height above Grate (A) Width at Widest Point (ft) Health healthy | unhealthy Damage to Plant yes | no Plant Replaced yes | no 6. Clean area around Filterra HC * Clean area around unit and remove all refuse to be disposed of appropriately. 7. Complete paperwork * Deliver Maintenance Report and photographs to appropriate location (normally Contech during maintenance contract period). * Some jurisdictions may require submission of maintenance reports in accordance with approvals. It is the responsibility of the Owner to comply with local regulations. 10 www.ContechES.com/filterra | 800-338-1122

Maintenance Check Problem Inlet Excessive sediment or trash accumulation Accumulated sediments or trash impair free flow of water into Filterra HC. Inlet should be free of obstructions allowing free distributed flow of water into Filterra HC HC. Sediments and/or trash should be removed. Mulch Cover Trash and floatable debris accumulation Excessive trash and/or debris accumulation Minimal trash or other debris ‘on mulch cover. Trash and debris should be removed and mulch cover raked level. Ensure bark nugget mulch is not used. Mulch Cover “Ponding” of water on mulch cover. “Ponding” in unit could be indicative of clogging due to excessive fine sediment accumulation or spill of petroleum oils. Stormwater should drain freely and evenly through mulch cover, Recommend contact manufacturer and replace mulch as a minimum. Vegetation Plants not growing or in poor condition Soil/mulch too wet, evidence of spill. Incorrect plant selection. Pest infestation. Vandalism to plants. Plants should be healthy and pest free. Contact manufacturer for advice. Vegetation Plant growth excessive Plants should be appropriate to the species and location of Filterra HC. Trim/prune plants in accordance with typical landscaping and safety needs. Structure Structure has visible cracks Cracks wider than 1/2 inch or evidence of soil particles entering the structure through the cracks. Vault should be repaired ‘Maintenance is ideally to be performed twice annually. Filterra HC Inspection & Maintenance Log Filterra HC System Size/Model: Location: Mulch & Depth of Date Debris Mulch Removed Added 5-5 gal a W/I/17 Buckets 3 Height of Vegetation Mulch Brand Above Grate Lowe's Premium 4” Brown Mulch Vegetation Species Galaxy Magnolia es with System - Standing water in downstream structure Comments - Removed blockage in downstream structure www.ContechES.com/filterra | 800-338-1122