Stormwater Facility Maintenance Manual

2015 Edition 2019 edit

For Municipal and Private Stormwater Facilities Disclaimer:

This manual is published as a guide and while the City of Bremerton strives to make the information in this publication as accurate as possible, the City makes no claims, promises, or guarantees about the accuracy, completeness, or adequacy of the contents of publication, and expressly disclaims liability for errors and omissions in the contents. All materials that appear in this publication are distributed and transmitted "as is," and no warranty of any kind, implied, expressed, or statutory is given with respect to the contents of this publication.

Information provided in this publication should not be used as a substitute for professional advice. The City of Bremerton assumes no liability for any damages or loss of any kind, including but not limited to, property damage, physical injury or death that might arise from the use of, misuse of, or the inability to use the materials contained herein or the performance of the tasks herein. The City also assumes no liability for improper or incorrect use of materials or information contained herein.

Any reference in this publication to any specific commercial product, process, or service, or the use of any trade, firm or corporation name is for the information and convenience of the public, and does not constitute endorsement, recommendation, or favoring by the City of Bremerton.

Acknowledgements Some content and photos in this maintenance manual are used with permission from the City of Lacey, Water Resources Engineer.

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Maintaining Stormwater Facilities

All stormwater facilities need to be maintained. Regular maintenance ensures proper functioning and keeps the facility aesthetically appealing. This Stormwater Facility Maintenance Guide was designed to help explain how stormwater facilities work and provide user-friendly guidance on how to maintain facilities to keep them functional and up to standards.

As a facility owner or homeowner’s association, you are responsible for regularly maintaining your privately-owned drainage facilities such as ponds, catch basins and pipes. Local governments maintain stormwater facilities located in public roadways.

Maintenance Checklists

The checklists in this guide are for you to use when inspecting and maintaining the stormwater facilities in your neighborhood. If you are missing a particular checklist, or if you have additional facilities not identified or addressed in this guide, please contact your site developer, design engineer, or local jurisdiction.

The checklists are in table format for ease of use and brevity. Each checklist tells you what part of the feature to check, how often to check, what to check for, and what to do about it. Log sheets are included to help you keep track of when you last surveyed the storm drainage system.

Although it is not intended for the maintenance survey to involve anything too difficult or strenuous, there are a few tools that will make the job easier and safer. These tools include:

• Gloves. • A flashlight (to look into catch basins, manholes or pipes). • A long pole or broom handle (see below). • Some kind of pry bar or lifting tool for pulling manhole and grate covers. • Standard yard tools, such as a rake and a shovel • Tape measure or yardstick

A listing of resources is also included within this packet (see next page). Here you will find the phone numbers of the agencies referred-to in the tables.

SAFETY WARNING:

Due to OSHA regulations, you should never stick your head or any part of your body into a manhole or other type of confined space. When looking into a manhole or catch basin, stand above it and use the flashlight to help you see. Use a pole or broom handle that is long enough when you are checking sediment depths in confined spaces. Always properly replace grates and lids.

NO PART OF YOUR BODY SHOULD BREAK THE PLANE OF THE OPEN HOLE.

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Checklist Instructions The following pages contain maintenance checklists covering most of the needs for the components of your drainage system, as well as for some components that you may not have (you can ignore those that don’t apply to your system). Let us know if there are any components of your drainage system that you do not recognize or are missing from these pages.

You should plan to complete a check for all system components on the following schedule, as per the “How Often” column in the checklists:

Quarterly – Plan to inspect the facility at least once per season, preferably during the following months – January, May, August, and November.

Annually – The best time for an annual inspection is in the late summer, preferably August.

After Storms – Also check all stormwater facilities after major storm events, defined as about 1 inch or more of precipitation in 24 hours.

Using photocopies of these checklists and the log sheet, check off the problems that you look for each time you do an inspection. Add comments regarding problems found and actions taken on the log sheet. Keep the completed forms in your files for future reference.

You may call the City of Bremerton at (360) 473-5920 for technical guidance. Please do not hesitate to call, especially if you are unsure whether a situation you have discovered may be a problem.

Resource Listing If you are unsure whether a problem exists, please contact the City at the number below and ask for technical assistance with your situation. Other resources are listed for your convenience and as references associated with the checklists.

City of Bremerton Public Works and Utilities Department (360) 473-5920

Kitsap County Household Hazardous Waste (HHW) Collection Facility (oil, paint, pesticides, etc.) (360) 337-5777

Solid Waste Disposal (yard waste, construction waste, contaminated soils, etc.) (360) 337-4898 or [email protected]

WSU Kitsap County Extension (Water Resource Ed. Programs, Envir. Stewardship info.) (360) 337-7157

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Log Sheet

Use copies of this log sheet to keep track of when maintenance checks occur and what items, if any, are repaired or replaced. The completed sheets will serve as a record of past maintenance activities and will provide valuable information on how your facilities are operating. Keep all log sheets in a designated area so others can easily access them.

Location: Date Checked: Checked By: Name: / _/20 Address: Phone:

City: Zip: __ ( )

Observations Facility and Follow-up Date (List things that Component Checked Actions Taken Action Taken should be done)

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Stormwater Facility Inspection & Maintenance Procedure

Stormwater facilities play an important role in managing the four feet of rainfall we receive in Bremerton in an average year. The term “stormwater facility” refers to any landscaped or structural feature that collects, conveys, cleans or infiltrates runoff water. There are many types of stormwater facilities, ranging from simple swales and ponds to more complicated filter systems and flow control devices. Your on-site stormwater facilities work together to control runoff water, reduce flooding and prevent pollution.

Owners of commercial property, multifamily residential property, or single-family residential properties with privately-owned drainage and stormwater facilities are required by City of Bremerton Codes to maintain their facilities to established standards for full functionality (Title 15 of the Bremerton Municipal Code). Facility owners are responsible for performing inspections of stormwater facilities, and for performing any maintenance identified by the inspections.

Basic maintenance work may be performed by the owner or property manager, although some tasks are best left to an experienced contractor. The inspection of stormwater facilities and any required maintenance work must be completed and reported to the City of Bremerton Public Works and Utilities Department by the date specified on the Stormwater Facilities Inspection & Maintenance Annual Reporting Form.

Instructions and helpful tips for successful facility inspections and maintenance are described in the following four steps:

Step 1. Identify

The first step is facility identification, so you know what types of stormwater facilities you have. Look on the site plan of your property, and note the main facility types indicated (such as wet ponds and infiltration basins), along with related drainage components (such as catch basins, pipes and debris barriers). Locate the various facilities on the ground.

Note that most drainage systems consist of components for four main purposes: stormwater collection (such as catch basins), conveyance (e.g. pipes and swales), water quality treatment (e.g. wet ponds) and flow control (via infiltration and/or surface discharge).

To assist you in identifying components, refer to the definitions and illustrations on the pages that follow.

Step 2. Inspect

For all facility components that you have identified, conduct an inspection. You may conduct the inspection yourself and/or with co-owners, or you may use a property manager or vendor to perform the inspection. Refer to the following Stormwater Facility Maintenance Checklists, which describe the maintenance standards for each component, and also identify and describe defects and their remedies.

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For each facility, note on the Inspection & Maintenance Checklist the condition of the facility (good, fair or poor), and any problems or other observations.

Step 3. Maintain

For all facility components, if the inspection indicates maintenance is needed, have the work performed by competent personnel. Basic maintenance tasks may be performed by the property owner(s) or property manager, but difficult or potentially dangerous tasks should be performed by a qualified vendor. Be safe! Use caution when inspecting and working on or near facilities, and stay out of confined spaces such as catch basins and manholes.

Note the action taken and the date, and record this information on the Log Sheet. Mark the check boxes on the Inspection & Maintenance Checklist corresponding to the maintenance accomplished on each facility.

Step 4. Submit

Submit the completed Inspection & Maintenance Checklist by August 15 each year by mail to: Bremerton PW&U Stormwater Maintenance Reports, 100 Oyster Bay Ave N, Bremerton WA 98312. The completed checklist may be scanned and e-mailed to [email protected]

* * *

Common Stormwater Facilities: Identification and Actions Note: General actions are described for each facility type below. Please refer to the Stormwater Facility Maintenance Standards for further details.

Ditch: A V-shaped channel, usually along the side of a road, that collects and conveys runoff.

Actions to keep Ditches functioning:

▪ Remove debris, litter and flow obstructions from the ditch. ▪ Do Not fill-in the ditch – prevent dirt, rocks and weeds from accumulating. ▪ Repair erosion on ditch side-slopes.

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Culvert: A pipe that continues conveyance flow from a ditch or swale under the ground surface, typically under driveways and cross-streets. Usually connects (“daylights”) to another ditch, swale or pond. The end of a pipe or culvert is often surrounded by rock “rip rap” (as in photo below, right) to prevent soil erosion.

Actions to keep Culverts functioning:

▪ Remove debris, litter and obstructions from the openings at the culvert-ends. ▪ Remove soil, sod and vegetation buildup from the culvert openings. ▪ Replace rock riprap at the culvert ends. ▪ Repair any damage to the culvert ends.

Catch Basin: An underground concrete box structure with a slotted metal grate on top that collects runoff water from the ground surface. Typically located within pavement in parking lots and in the street gutter, usually next to a curb. Grate on top lets water in and keeps larger debris out. Sediment settles in the sump in the bottom (below the pipe openings) and must be removed periodically. Catch basins (CBs) have an outlet pipe between the grate and the sump, to let the cleaner water flow out to a storm pond or other location. Some CBs have both inflow and outflow pipes, to convey collected runoff water through.

Actions to keep Catch Basins functioning:

▪ Remove litter, leaves, debris and obstructions from catch basin grates. ▪ Hire a professional to remove sediment buildup from sump (if road is privately owned; catch basins in the public right-of-way are maintained by the City). City of Bremerton Stormwater Facilities Maintenance Manual Page 8

Biofiltration Swale (or Bio-Swale): A wide, shallow channel with gently-sloping sides and a flat bottom, lined with grass. Swales are designed to provide water quality treatment as the grass filters-out sediment and pollutants. Water infiltrates into the soil as it slowly flows along the swale.

Actions to keep Swales functioning:

▪ Remove debris, litter and flow obstructions from the swale. ▪ Mow the swale and maintain healthy grass cover. ▪ Prevent dirt, rocks and weeds from accumulating, but do not use herbicides. ▪ Do not fill-in the swale with rocks, bark, etc. ▪ Aerate the soil to preserve infiltration capacity.

Wetpond: A constructed pond with an impermeable liner to maintain a permanent pool of water, which provides for water quality treatment by settling and retention of sediment particles and other pollutants. The cleaner surface water is then conveyed to a nearby infiltration facility (such as, a “dry pond”) or surface discharge. A wetpond provides a basic level of treatment, and is common in many neighborhoods.

Actions to keep Wetponds functioning:

▪ Remove litter and yard debris from within and around the pond. ▪ Check inflow and outflow systems, and remove any obstructions. ▪ Remove excess vegetation such as cattails from within the pond. ▪ Remove noxious weeds, but do not use herbicides (contact City for advice). City of Bremerton Stormwater Facilities Maintenance Manual Page 9

Constructed Wetland: A created wetland with a permanent pool of water, similar to a wet pond but generally shallower and with aquatic emergent plants which provide for a higher level of water quality treatment of collected stormwater through biological processes.

Actions to keep Constructed Wetlands functioning:

▪ Remove litter and yard debris from within and around the wetland. ▪ Check inflow and outflow systems, and remove any obstructions. ▪ Remove excess vegetation such as cattails from within the wetland. ▪ Remove noxious weeds, but do not use herbicides (contact City for advice).

Bioretention Cell (or “Rain Garden”): A garden-like landscaped excavation backfilled with specified soil mixture and plantings. Bioretention is a “low-impact development” (LID) practice that is integrated into a site to retain stormwater near its source. It provides treatment and infiltration of runoff water by passing it slowly through the soil mix and plant roots into the native soil below.

Actions to keep Bioretention Cells and Rain Gardens functioning:

▪ Remove litter, weeds and fallen leaves. Do not use herbicides or pesticides. ▪ Check inflow and outflow systems, and remove any obstructions. ▪ Repair erosion, cover bare spots with organic mulch. ▪ Perform plant maintenance as needed, such as pruning branches. ▪ Remove dead vegetation and replace dead plants with same varieties.

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Debris Barriers and Trash Racks: A structural device with metal bars, to prevent debris from entering a pipe, spillway or hydraulic structure.

SAFETY: Do not clean trash rack when flowing! Check trash racks and culvert entrances regularly to prevent plugging during storm events. Reference this research: SAFETY DESIGN FOR STORM WATER RETENTION AND DETENTION or lookup: TrashRackforSafety.pdf.

Actions to keep Debris Barriers and Trash Racks functioning:

▪ Remove trash, debris, vegetation and dirt from around the structure. ▪ Check inflow and outflow, and remove any flow obstructions. ▪ Remove plants such as alder and willow that tend to grow near the pipe ends. ▪ Check for structural integrity; hire a professional to fix broken bars or racks.

Infiltration Basin (“Dry Pond”): A shallow bowl-like depression in the land, with a broad, flat bottom area to collect, temporarily store and infiltrate stormwater. An infiltration basin is commonly found adjacent to a wet pond, to receive treated water and allow it to infiltrate into the soil. The infiltration basin is usually lined with grass and drains “dry” between rain events. Some playfields (as in photo below, left) double as infiltration basins by design.

Actions to keep Infiltration Basins functioning:

▪ Remove litter, yard debris and problem vegetation such as Scotch broom. ▪ Maintain a healthy grass cover to prevent erosion and weed growth. ▪ Repair erosion, and replace rock riprap at pipe ends. ▪ Avoid activities within the basin that could cause erosion or soil compaction. ▪ Avoid using herbicides or pesticides within the basin area. ▪ Aerate the soil in the bottom area as needed to preserve and enhance infiltration.

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Stormwater Facility Maintenance Standards

The following pages contain facility-specific maintenance standards, which are intended to be observable conditions for determining whether maintenance actions are required.

Check if on Group 1: Ponds and Swales Subject Site

1a Detention Ponds & Infiltration Basins (“dry ponds”)  1b Wet ponds and Constructed Wetlands  1c Biofiltration Swales (or Bio-Swales)  1d Wet Bio-Swales  1e Filter Strips  1f Open Sand Filters  1g Bioretention Cells (Rain Gardens) 

Group 2: Underground Tanks, Vaults and Trenches

2a Detention Tanks and Vaults  2b Wetvaults  2c Enclosed Sand Filters  2d Dispersion Trenches  2e Infiltration Trenches and Galleries 

Group 3: Structures and Pre-Treatment

3a Control Structures/Flow Restrictors  3b Catch Basins  3c Debris Barriers (Trash Racks)  3d Energy Dissipators  3e API (Baffle) Oil/Water Separators  3f Coalescing Plate Oil/Water Separators  3g Catch Basin Inserts 

Group 4: Miscellaneous Facilities and Features

4a Downspouts and Roof Drywells  4b Conveyance Pipes and Ditches  4c Access Roads 

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Group 5: Proprietary Treatment Systems

5a Modular Wetland Systems  5b Filterra Tree Vault  5c Contech Jellyfish Filter  5d Contech CDS Hydrodynamic Separator  5e Contech Stormfilter  5f Other Proprietary System Manufacturers 

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Group 1

Ponds and Swales

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1a Detention Ponds & Infiltration Basins (“dry ponds”)

Detention ponds and infiltration basins are earthen excavations that are “dry” except during and after rains, when they contain stormwater temporarily. Detention ponds store water while releasing it gradually; infiltration basins percolate water into the ground.

k

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What ec How Problem What to do for o D

to Conditions to Check For Ch

Often or Defect Desired Condition Check √ √

Dumping of yard wastes such as grass clippings and branches into pond. Trash & Remove and properly Quarterly Presence of glass, plastic, Debris dispose all trash /debris. metal, foam, or paper. There should be no visual evidence of dumping.

Any invasive vegetation Completely remove such as Scotch broom or invasive, noxious or non- blackberry vines, or any Noxious or native vegetation. Do vegetation which may Quarterly Poisonous not spray chemicals on constitute a hazard to the Vegetation vegetation without public, such as poison oak, guidance or City tansy ragwort, stinging approval. nettles, or devil’s club.

First, try to locate the

source of the pollution. Presence of chemicals such Then, call the Moderate Pollution or as natural gas, oil, and Quarterly Risk Waste Program at Fire Hazard gasoline, obnoxious color, Kitsap County odor, or sludge. Environmental Health to report the hazard.

Entire Any evidence of rodent Destroy rodents and Facility holes if facility is acting as repair the dam or berm. Rodent Quarterly a dam or berm. Water Contact Kitsap County Holes should not be able to flow Health Department for through the rodent holes. guidance.

Insects such as wasps and Destroy or remove hornets interfering with insects. For mosquito Quarterly Insects maintenance activities, or control, eliminate mosquitoes becoming a stagnant water. nuisance.

Ensure trees/shrubs are not Overgrown Prune tree limbs to allow interfering with the facility Vegetation for maintenance. Trees Annually function or maintenance around should not be present (i.e. mowing, silt removal, pond within ponds. or access).

For grassy ponds, Sparse, weedy, or selectively thatch, aerate, Vegetation overgrown grass in grassy and re-seed ponds. not dry/infiltration ponds. Grass should be kept growing or Quarterly Presence of invasive under 8" height. In wet overgrown species or sparse/excessive ponds, control cattails within pond growth of plants in wetland and unwanted vegetation ponds. to less than 25% of pond surface area.

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1a Detention Ponds / Infiltration Basins (continued)

k ne ec What to How Problem Conditions to Check What to do for o D Ch

Check Often or Defect For Desired Condition

√ √

Check around the inlets Try to determine what and outlets for signs of has caused the erosion erosion. Check berms for and fix it. Stabilize signs of sliding or settling. Side slopes by reinforcing the Annually Erosion Action is needed where Slopes slope with rock, planting eroded damage is over 2" grass, or compacting the deep and where there is soil. Contact the City of potential for continued Bremerton for assistance. erosion.

Accumulated sediment that exceeds 10% of the

designed pond depth

unless otherwise specified Clean out sediment and or affects inlets or outlets aerate and/or of the facility. Sediment re-seed the pond if Annually (If a percolation test pit or Build-Up deemed necessary to test of Infiltration facility improve infiltration and indicates facility is only control erosion. working at 90% of its designed capabilities. If two inches or more Pond sediment is present. Storage Check to see if liner is Area visible and has more than three 1/4-inch holes,

exposed and or torn. An PVC Pond Repair or replace liner as Quarterly indicator of a torn liner

Liner could be the pond no needed. longer holds water. (during long dry periods the water may evaporate)

Check to see if pond is holding water. (during Repair liner to designed Quarterly Clay Liner long dry periods the water state. may evaporate) Build the dike or berm

Any part of the dike or back to the original

berm which has settled elevation. If there is Annually Settlement more than 4 inches lower significant settling a Dikes or than designed. licensed Civil Engineer Berms should be consulted.

Repair berm to stop Check for water flowing Quarterly Seepage seepage. (Consult a through the pond berm. Geotechnical Engineer)

Check to see that the rip Emergency rap protective area is Rocks Replace rocks so that all Overflow Annually intact. If any native soil is Missing native soil is covered. Spillway exposed, cover soil with rock rip rap.

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1a Detention Ponds/ Infiltration Basins (continued)

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ec What to How Problem What to do for o D

Conditions to Check For Ch

Check Often or Defect Desired Condition

√ √

Check around the inlets Try to determine what and outlets for signs of has caused the erosion

erosion. Check berms for and fix it. Stabilize signs of sliding or settling. slopes by reinforcing Side Annually Erosion Action is needed where the slope with rock, Slopes eroded damage is over 2" planting grass, or deep and where there is compacting the soil. potential for continued Contact the City of erosion. Bremerton. Accumulated sediment that exceeds 10% of the designed pond depth or

affects inlets or outlets of Clean out sediment and

the facility. re-seed the pond if Sediment Annually (If a percolation test of deemed necessary to Build-Up infiltration facility indicates improve infiltration and facility is only working at control erosion. 90% of its designed capabilities, or if 2” or more sediment is present. Pond Check to see if liner is Storage visible and has more than Area Repair or replace liner three 1/4-inch holes, as needed. Note: PVC Pond exposed and or torn. An wetponds or detention Quarterly Liner indicator of a torn liner ponds may have liners, could be the pond no but infiltration ponds do longer holds water. not have liners. (during long dry periods the water may evaporate)

Check to see if pond is holding water. (during Repair liner to designed Quarterly Clay Liner long dry periods the water state. may evaporate) Build the dike or berm

Any part of the dike or back to the original

berm which has settled elevation. If there is Annually Settlement more than 4 inches lower significant settling a Dikes or than designed. licensed civil engineer Berms should be consulted.

Repair berm to stop Check for water flowing Quarterly Seepage seepage. (Consult a through the pond berm. Geotechnical Engineer)

Check to see that the rip Emergency rap protective area is Rocks Replace rocks so that all Overflow Annually intact. If any native soil is Missing native soil is covered. Spillway exposed, cover soil with rock rip rap.

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1a Detention Ponds/ Infiltration Basins (continued)

k ne ec What to How Problem or Conditions to Check What to do for o D Ch

Check Often Defect For Desired Condition

√ √

Make sure the riprap under the inlet pipe is

intact and no native soil is exposed. Check for Replace rocks and/or Annually Erosion accumulations of clean out sediment. Emergency sediment deeper than Overflow half the height of the Spillway rocks.

(cont.) Replace screen if it is The bar screen over the not attached. Remove Screen outlet should be intact any trash or debris and Quarterly clogged and clear of debris. dispose of properly. or missing Water should flow freely Clean out the end pipe if through the outlet pipe. necessary. Ensure sediment and Sediment debris do not obstruct Clean out the sump Quarterly and Debris water flow into the area. Buildup

infiltration area. Add a sediment trapping Sediment area by constructing a Trapping Stormwater should not sump or berm for Area Inadequate enter the infiltration area settling of solids. This Annually Sediment without some method of area should be separate Settling Area settling-out solids. from the rest of the facility. Contact City of Bremerton for guidance.

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1b Wet ponds and Constructed Wetlands

Wet ponds and constructed wetlands are designed to improve water quality. They have a permanent pool of water, which slows incoming stormwater flows causing sediments and pollutants to settle-out. Constructed wetlands are designed with emergent aquatic plants to provide biological treatment and filtering of runoff water, while wet ponds are typically deeper and utilize the pool volume to reduce pollutant loads.

k ne

ec What to Problem or Conditions to What to do for o

How Often D Ch

Check Defect Check For Desired Condition

√ √

First cell is empty, Line the first cell to doesn't hold maintain at least 4 feet water. of water. Second cell may drain, but the first Annually Water Level cell must remain full to control turbulence of the incoming flow and reduce sediment resuspension.

Accumulation that Trash and debris Trash and exceeds 1 cu. ft. removed from pond. Quarterly Debris per 1000 sq. ft. of pond area.

Inlet/Outlet pipe No clogging or blockage Inlet/Outlet clogged with in the inlet and outlet Quarterly Pipe sediment and/or piping. debris material.

Accumulated Sediment removed from

sediment on pond pond bottom. Sediment bottom that Accumulation exceeds the depth Entire Annually Facility on Pond of sediment zone Bottom plus 6-inches, usually in the first cell of the pond.

Visible and Oil removed from water prevalent oil using oil-absorbent pads sheen. or vactor truck. Locate and correct oil source. Oil Sheen If chronic low levels of Quarterly on Water oil persist, plant wetland plants such as Juncus effusus (soft rush) which can uptake small concentrations of oil.

Erosion of the Slopes stabilized using pond’s side slopes proper erosion control and/or scouring of measures and repair pond bottom that methods. Quarterly Erosion exceeds 6-inches, or where continued erosion is prevalent

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1b Wetponds and Constructed Wetlands (continued)

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ec What to do for What to Problem or Conditions to Check o D

How Often Ch Desired

Check Defect For Condition √ √

Any part of these Dike/berm is components that has repaired to Settlement settled 4-inches or lower specifications. Annually of Pond than the design elevation, Dike/Berm or inspector determines dike/berm is unsound.

Berm dividing cells should Berm surface is be level. leveled so that Internal Annually water flows evenly Berm over entire length of berm.

Rock is missing and soil is Rocks replaced to Overflow Annually exposed at top of spillway specifications. Entire Spillway or outside slope. Facility Check to see if liner is

visible and has more than three 1/4-inch holes, is Repair or replace PVC Pond exposed and/or torn. An liner as needed. Quarterly Liner indicator of a torn liner Note: wetponds could be the pond no usually have liners longer holds water (during long dry periods the water may evaporate)

Check to see if pond is holding water (during Repair liner to Quarterly Clay Liner long dry periods the design state. water may evaporate)

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1c Biofiltration Swale (Bio-Swale)

A gently-sloped channel with gentle side slopes, lined with grass (and sometimes other vegetation) to slow the flow and allow for water quality treatment and infiltration.

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What ec How Problem or Conditions to Check What to do for Desired o D

to Ch

Often Defect For Condition Check √ √

Sediment depth Remove sediment deposits exceeds 2 inches. on grass treatment area of the bio-swale. When Sediment finished, swale should be Quarterly Accumulation level from side to side and on Grass drain freely toward outlet. There should be no areas of standing water once inflow has ceased.

When water stands in Any of the following may

the swale between apply: remove sediment or storms and does not trash blockages, improve

Quarterly Standing drain freely. grade from head to foot of Water swale, remove clogged check dams, add underdrains or convert to a wet biofiltration swale.

Flow spreader uneven Level the spreader and or clogged so that clean so that flows are Quarterly Flow spreader flows are not spread evenly over entire uniformly distributed swale width. through entire swale idth Small quantities of Add a low-flow pea-gravel water continually flow drain the length of the General through the swale, swale or by-pass the base Quarterly Constant even when it has been flow around the swale. Base flow dry for weeks, and an eroded, muddy channel has formed in the swale bottom.

Grass is sparse or bare Determine why grass or eroded patches growth is poor and correct occur in more than that condition. Re-plant Poor 10% of the swale with plugs of grass from Quarterly Vegetation bottom. Coverage the upper slope: plant in the swale bottom at 8-inch intervals. Or re-seed into loosened, fertile soil.

When the grass Mow vegetation or remove becomes excessively nuisance vegetation so that tall (greater than 10”); flow not impeded. Grass Quarterly Vegetation when nuisance weeds should be mowed to a and other vegetation height of 3 to 4 inches. start to take over. Remove grass clippings.

Grass growth is poor If possible, trim back over- Annually Excessive because sunlight does hanging limbs and remove Shading not reach swale. brushy vegetation on adjacent slopes.

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1c Biofiltration Swale (Bio-Swale) (continued)

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What ec How Problem or Conditions to What to do for Desired o D

to Ch

Often Defect Check For Condition Check √ √

Inlet/outlet areas Remove material so that clogged with there is no clogging or Quarterly Inlet/Outlet sediment and/or blockage in the inlet and debris. outlet area.

Trash and debris Remove trash and debris Trash and Debris Quarterly accumulated in from bioswale. Accumulation the bio-swale.

Eroded or scoured For ruts or bare areas less swale bottom due than 12 inches wide, repair Swale to flow the damaged area by filling channelization, or with crushed gravel. If bare higher flows. areas are large, generally greater than 12 inches wide, the swale should be re- Annually Erosion/Scouring graded and re-seeded. For smaller bare areas, over seed when bare spots are evident, or take plugs of grass from the upper slope and plant in the swale bottom at 8-inch intervals.

Alternative table I found:

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1d Wet Biofiltration Swale (Wet Bio-Swale)

Similar to a standard Bio-Swale (previous pages), but with modifications due to saturated soil conditions (such as, specific plants that can tolerate wet conditions).

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What ne ec

How Problem or Conditions to What to do for Desired o to D

Often Defect Check For Ch Condition

Check √ √

Sediment depth Remove sediment deposits Sediment in treatment area. Swale Quarterly exceeds 2-inches in Accumulation 10% of the swale treatment area.

Water not retained Build up or repair outlet to a depth of about berm so that water is Swale Quarterly Water Depth 4 inches during the retained in the wet swale. wet season.

Vegetation becomes Determine cause of lack of sparse and does not vigor of vegetation and provide adequate correct. Replant as

filtration, OR needed. For excessive vegetation is cattail growth, cut cattail Swale Quarterly Wetland crowded out by very shoots back and compost Vegetation dense clumps of off-site. Note: normally cattail, which do not wetland vegetation does allow water to flow not need to be harvested through the clumps. unless die-back is causing oxygen depletion in downstream waters.

Inlet/outlet area Remove clogging or clogged with blockage in the inlet and Swale Quarterly Inlet/Outlet sediment and/or outlet areas. debris.

Swale Quarterly Trash and Debris Any plastic, paper or Remove trash and debris Accumulation other waste or debris. from wet swale.

Swale has eroded or Check design flows to scoured due to flow assure swale is large channelization, or enough to handle flows. higher flows. By-pass excess flows to enlarge swale. Replant Swale Quarterly Erosion/Scouring eroded areas with fibrous- rooted plants such as Juncus effusus (soft rush) in wet areas or snowberry (Symphoricarpos albus) in dryer areas.

City of Bremerton Stormwater Facilities Maintenance Manual Page 23

1e Filter Strip

A basic filter strip is a flat grassy area that provides treatment of unconcentrated sheet flow runoff from adjacent pavement. Can provide enhanced treatment for metals in runoff water when soil is amended with organic compost and grass is sufficiently dense.

k ne

What ec How Problem or Conditions to What to do for Desired o D

to Ch

Often Defect Check For Condition Check √ √

Sediment depth Remove sediment Sediment exceeds 2 inches. deposits, re-level so slope Quarterly Accumulation on is even and flows pass Grass evenly through strip.

When the grass Mow grass, control becomes excessively nuisance vegetation, such tall (greater than that flow not impeded. Quarterly Vegetation 10-inches); when Grass should be mowed to nuisance weeds and a height between 3-4 other vegetation inches. starts to take over.

Trash and debris Remove trash and Debris Trash and Debris Quarterly accumulated on the from filter. Accumulation filter strip.

Eroded or scoured For ruts or bare areas less areas due to flow than 12 inches wide, General channelization, or repair the damaged area higher flows. by filling with crushed gravel. The grass will creep in over the rock in time. If bare areas are Quarterly Erosion/Scouring large, generally greater than 12 inches wide, the filter strip should be re- graded and re-seeded. For smaller bare areas, over seed when bare spots are evident.

Flow spreader Level the spreader and uneven or clogged clean so that flows are so that flows are not spread evenly over entire Quarterly Flow spreader uniformly distributed filter width. through entire filter width.

City of Bremerton Stormwater Facilities Maintenance Manual Page 24

1f Sand Filter

A typical open sand filter consists of a pre-treatment system to remove sediments, a flow spreader, a sand bed, and underdrain piping. See also Sand Filter Vault.

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What ec How Problem or Conditions to Check What to do for o D

to Ch

Often Defect For Desired Condition Check √ √

Sediment depth No sediment on the exceeds 1/2-inch. Sediment sand filter that would Quarterly Accumulation impede permeability of the filter section. on top layer

Trash and debris Trash and debris Trash and accumulated on sand removed from sand filter Quarterly Debris filter bed. bed. Accumulations

When the clean-outs Sediment removed from Sediment/ become full or partially clean-outs. Quarterly Debris in plugged with sediment Clean-Outs and/or debris.

Drawdown of water Top several inches of through the sand filter sand are scraped. May media takes longer require replacement of

than 24-hours, and/or entire sand filter depth Quarterly Sand Filter flow through the depending on extent of Above Media overflow pipes occurs plugging (a sieve analysis Ground frequently. is helpful to determine if (open the lower sand has too sand high a proportion of fine filter) material).

Sand is saturated for Low, continuous flows prolonged periods of are limited to a small time (several weeks) portion of the facility by and does not dry out using a low wooden Prolonged Quarterly between storms due to divider or slightly Flows continuous base flow depressed sand surface. or prolonged flows from detention facilities.

When flows become Flow and percolation of concentrated over one water through sand filter Quarterly Short Circuiting section of the sand is uniform and dispersed filter rather than across the entire filter dispersed. area.

Erosion over 2-inches Slopes stabilized using Erosion deep where cause of proper erosion control Quarterly Damage to damage is prevalent or measures. Slopes potential for continued erosion is evident.

City of Bremerton Stormwater Facilities Maintenance Manual Page 25

1f Sand Filter (continued)

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What ec How Problem or What to do for o

to Conditions to Check For D Ch

Often Defect Desired Condition Check √ √

Rock Pad Soil beneath the rock is Rock pad replaced or Quarterly Missing or visible. rebuilt to design Out of Place specifications.

Above Flow spreader uneven or Spreader leveled and Ground Flow clogged so that flows are cleaned so that flows Quarterly (open Spreader not uniformly distributed are spread evenly over sand across sand filter. sand filter. filter) Any part of the piping that Pipe repaired or Damaged is crushed or deformed replaced. Annually Pipes more than 20% or any other failure to the piping.

City of Bremerton Stormwater Facilities Maintenance Manual Page 26

1g Bioretention Cells (Rain Gardens)

A bioretention cell is a shallow, garden-like landscaped depression backfilled with 12” or more of a designed soil mixture and specific plantings for varying moisture conditions. Bioretention areas require annual plant, soil, and mulch maintenance to ensure optimum infiltration and pollutant removal capabilities. Most routine maintenance procedures are typical landscape care activities, but other tasks are more typical of drainage facilities.

Table 1. Routine Maintenance

Completed Activity Schedule Objective What to do & Notes (Date/By)

Watering: Maintain Check system Plants should be selected to be irrigation system. twice annually drought-tolerant and not require Fix leaks & breaks, (such as, in Establish vegetation with a watering after establishment (2-3 and clear blockages. May & July); minimum 80% survival rate. years). Watering may be needed Hand water as water only as during prolonged dry periods needed for specific needed for after plants are established. plants. plant health.

Periodic weeding is necessary As needed, Reduce competition for desired Weeding: Remove until plants are established. Pull and especially vegetation. Improve undesired vegetation weeds by hand, if possible. prior to seed aesthetics. Exclude by hand. Avoid using chemical weed disbursement undesirable plants. controls. Maintain plant health and Prune/control adequate plant coverage. Depending on aesthetic vegetation: Reduce shading of under-story requirements, occasional pruning Trim excessive Once or twice if species require sun. and removing dead plant material growth of branches annually Maintain soil health and may be necessary. Remove and and remove dead infiltration capability. Maintain dispose of properly. Avoid plant material. clearances from utilities and compacting soil in rain garden. sight distances.

Clean the entry: Check at least Maintain proper flow of Remove any twice annually Remove debris from curb drops stormwater from paved and/or accumulation of (such as, in and gutters in flow path to the impervious areas to debris from flow October and bioretention area. bioretention facility. entrance to garden January)

Once annually, Use compost mulch on the rain Mulching: Replace Replenish organic material in or every two garden bottom area and lower or add mulch with soil, reduce erosion, prolong years if runoff side slopes, and wood chips on hand tools to a depth good soil moisture level, filter pollutant load is the upper side slopes and rim of 2-4 inches. pollutants. low. (above typical water levels).

As needed, Maintain aesthetics and Trash, Litter & Remove paper, plastic and other check at least prevent clogging of Debris Removal deleterious material from garden monthly infrastructure. Maintain access Prevent clogging of grates and to infrastructure: pipes; prevent encroachment Clear vegetation on utilities or other within one foot of Annually infrastructure; maintain sight inlets and outfalls, lines for traffic; maintain maintain access access for inspections. pathways.

City of Bremerton Stormwater Facilities Maintenance Manual Page 27

1g Bioretention Cells (Rain Gardens) - continued

Table 2. Non-routine Maintenance

Completed Activity Schedule Objective What to do & Notes (Date/By)

Erosion control: Properly designed facilities should

Prevent erosion and Reduce sediment transport not have erosion problems. If sediment movement. and clogging of infrastructure. erosion problems persist, assess: Determined by Replace soil, plant Maintain desired plant (1) flow volumes vs. garden size, inspection. material, and/or mulch survival and appearance of (2) flow velocities and gradients, layer in areas where facilities. (3) flow dissipation and erosion erosion has occurred. protection at the flow entrance.

Remove Sediment: Reduce sediment transport If sediment is deposited in the Shovel or rake out and clogging of infrastructure. bioretention area, determine the sediment within Determined by Maintain plant survival and source within the contributing vegetated areas. inspection. appearance of facilities. area and stabilize sediment Vactor catch basins Maintain proper elevations source to prevent erosion. and sediment traps. and ponding depths. Clean underdrains: Determined by Maintain proper subsurface Jet clean or rotary cut inspection of drainage, ponding depths, debris/roots from clean-outs. and dewatering rates. under-drains. Clear flow entry: Prevent accumulation of Bioretention facilities should be Remove excess vegetation at pavement edge designed with a proper elevation vegetation at garden Determined by and maintain proper sheet drop from pavement to edge with line trimmer, inspection. flow of stormwater from vegetated area to prevent vacuum sweeper, rake paved and/or impervious blockage of storm flows by and/or shovel. areas to rain garden. vegetation into infiltration area.

Replace plants: Maintain dense vegetation Replant bare spots or If specific plants have a high Determined by cover to prevent erosion, poor-performing plants mortality rate, assess the cause inspection. encourage infiltration and per original design or and replace with suitable species. exclude weeds. per City. Determined by Soil mixes for bioretention Maintain infiltration, soil inspection facilities are designed to maintain Replace soil: fertility and pollutant removal (visual) or tests long-term fertility and pollutant Remove vegetation capability. Save as much (infiltration, processing capability. Replacing and excavate soil. plant material as possible for pollutant, or mulch helps prolong performance replanting. soil fertility). & reduce pollutant accumulation. Rebuild or reinforce

structures: Various activities to maintain Maintain proper drainage and Determined by walls, intake and aesthetics, and prevent inspection. outfall pads, weirs, erosion. other hardscape elements

Regrade or Prevent erosion where side recontour slopes: Determined by slopes have been disturbed Maintain proper slopes inspection. by foot or auto traffic and replant exposed intrusion. areas.

City of Bremerton Stormwater Facilities Maintenance Manual Page 28

Group 2

Underground Tanks, Vaults and Trenches

City of Bremerton Stormwater Facilities Maintenance Manual Page 29

2a Detention Tanks and Vaults

These types of storage structures are usually underground and accessed via a manhole. DO NOT ENTER ANY TANK OR VAULT without proper training, certification & equipment.

k ne

What ec What to do for How Problem or o D

to Conditions to Check For Ch Desired

Often Defect Check Condition √ √

One-half of the cross section of a Vents open and Plugged Air Quarterly functioning. Vents vent is blocked at any point, or the vent is damaged.

Accumulated sediment depth All sediment and exceeds 10% of the diameter of debris removed the storage area for 1/2 length of from storage

storage vault or any point depth area. exceeds 15% of diameter. Quarterly Debris and Sediment (Example: 72-inch storage tank would require cleaning when sediment reaches depth of 7 inches for more than 1/2 length of tank.)

Any openings or voids allowing All joint between Joints Between material to be transported into tank/pipe facility. sections are Quarterly Tank/Pipe Section sealed. Storage (Will require engineering analysis Area to determine structural stability).

Any part of tank/pipe is bent out Tank/pipe of shape more than 10% of its repaired or Tank Pipe Bent Annually design shape. (Review required replaced to Out of Shape by engineer to determine design. structural stability).

Cracks wider than 1/2-inch and Vault replaced or any evidence of soil particles repaired to entering the structure through design Vault Structure the cracks, or specifications Includes maintenance/inspection and is Cracks in Wall, personnel determines that the structurally Annually Bottom, vault is not structurally sound. sound. Damage to Frame and/or Cracks wider than 1/2-inch at the No cracks more Top Slab joint of any inlet/outlet pipe or than 1/4-inch any evidence of soil particles wide at the joint entering the vault through the of the walls. inlet/outlet pipe.

Cover is missing or only partially Manhole is Quarterly Cover Not in place. Any open manhole closed. in Place requires maintenance.

Manhole Mechanism cannot be opened by Mechanism one maintenance person with opens with Locking proper tools. Bolts into frame proper tools. Quarterly Mechanism have less than 1/2 inch of thread Not Working (may not apply to self-locking lids)

City of Bremerton Stormwater Facilities Maintenance Manual Page 30

2a Detention Tanks and Vaults (continued)

k

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What ec How Problem What to do for o D

to Conditions to Check For Ch

Often or Defect Desired Condition Check √ √

One maintenance person cannot Cover can be Cover remove lid after applying removed and Quarterly Difficult to normal lifting pressure. Intent reinstalled by one Remove is to keep cover from sealing off maintenance person. Manhole access to maintenance.

Ladder is unsafe due to missing Ladder meets design Ladder rungs, misalignment, not standards. Allows Quarterly Rungs securely attached to structure maintenance person Unsafe wall, rust, or cracks. safe access. Catch See “Catch See “Catch Basins” See “Catch Basins” Basins Basins”

City of Bremerton Stormwater Facilities Maintenance Manual Page 31

2b Wet Vaults

These types of storage structures are usually underground and accessed via a manhole. DO NOT ENTER ANY TANK OR VAULT without proper training, certification & equipment.

k ne

What ec What to do for Problem or Conditions to Check o D

to How Often Ch Desired

Defect For Check Condition √ √

Trash and debris Remove trash and accumulated in vault, pipe debris from vault. Trash/Debris Quarterly or inlet/outlet (includes Accumulation floatables and non- floatables).

Sediment accumulation in Remove sediment Sediment vault bottom exceeds the from vault. Quarterly Accumulation in depth of the sediment Vault zone plus 6-inches.

Inlet/outlet piping Pipe repaired Quarterly Damaged Pipes damaged or broken and in and/or replaced. need of repair.

Cover cannot be opened Pipe repaired or Access Cover or removed, especially by replaced to proper Quarterly Damaged/Not one person. working Working specifications.

Ventilation area blocked or Blocking material plugged. removed or cleared from ventilation area. A specified % of the vault surface Vault Quarterly Ventilation area must provide ventilation to the vault interior (see design specifications).

Maintenance/inspection Vault replaced or personnel determine that repairs made so the vault is not structurally that vault meets sound. design specifications and is Vault Structure Damage - structurally sound. Includes Cracks Annually in Walls Bottom, Damage to Frame and/or Cracks wider than 1/2- Vault repaired so no Top Slab inch at the joint of any cracks exist wider inlet/ outlet pipe or than 1/4-inch at the evidence of soil particles entering through the joint of the cracks. inlet/outlet pipe.

Baffles corroding, cracking Baffles repaired or warping and/or showing replaced to Annually Baffles signs of failure as deemed specifications. by maintenance/ inspection staff. City of Bremerton Stormwater Facilities Maintenance Manual Page 32

2b Wet Vaults (continued)

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What ec How Problem Conditions to Check What to do for Desired o D

to Ch

Often or Defect For Condition Check √ √

Ladder is corroded or Ladder replaced or repaired deteriorated, not to specifications, and is safe functioning properly, not to use as determined by Access attached to structure inspection personnel. Vault Annually Ladder wall, missing rungs, has Replace sign warning of Damage cracks and/or confined space entry misaligned. Confined requirements. Ladder and space warning sign entry notification complies missing. with OSHA standards.

City of Bremerton Stormwater Facilities Maintenance Manual Page 33

2c Enclosed Sand Filter

Similar to an open sand filter, but installed below grade within a vault.

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What ec How Problem or Conditions to What to do for Desired o D

to Ch

Often Defect Check For Condition Check √ √

Sediment depth No sediment deposits on Sediment exceeds 1/2-inch. sand filter section that Accumulation on would impede Vault Quarterly Sand Media permeability of the filter Section section.

Sediment No sediment deposits in Sediment accumulation in first chamber of vault. Vault Quarterly Accumulation in vault bottom Pre-Settling exceeds the depth Portion of Vault of sediment zone plus 6-inches.

Trash and debris Trash and debris removed accumulated in from vault and inlet/outlet Trash/Debris Vault Quarterly vault, or pipe inlet/ piping. Accumulation outlet, floatables and non-floatables.

When drain pipes, Sediment and debris Vault Quarterly Sediment in Drain cleanouts become removed. Pipes/Cleanouts full with sediment and/or debris.

When seepage/flow Sand filter media section occurs along the re-laid and compacted vault walls and along perimeter of vault corners. Sand to form a semi-seal. Vault Quarterly Short Circuiting eroding near inflow Erosion protection added area. to dissipate force of incoming flow and curtail erosion.

Inlet or outlet Pipe repaired and/or piping damaged or replaced. Pipes Annually Damaged Pipes broken, in need of repair.

Cover cannot be Cover repaired to proper opened, corrosion/ working specifications or deformation of replaced. Access Cover cover. Maintenance Vault Quarterly Damaged/Not person cannot Working remove cover using normal lifting pressure.

Ventilation area Blocking material blocked or plugged removed/cleared from ventilation area. A Vault Quarterly Ventilation specified % of the vault surface area must provide venting to the vault interior (per design)

City of Bremerton Stormwater Facilities Maintenance Manual Page 34

2c Enclosed Sand Filter (continued)

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What ec What to do for How Problem or o

to Desired D Conditions to Check For Ch

Often Defect Check Condition √ √

Cracks wider than 1/2-inch or Vault replaced or evidence of soil particles repairs made so entering the structure that vault meets through the cracks, or design Vault Annually Vault Structure maintenance/inspection specifications Damaged; personnel determine that the and is Includes Cracks in vault is not structurally structurally Walls, Bottom, sound. sound.

Damage to Frame Cracks wider than 1/2-inch at Vault repaired so and/or Top Slab. the joint of any inlet/outlet that no cracks Vault Annually pipe or evidence of soil exist wider than particles entering through the 1/4-inch at the cracks. joint of the inlet/outlet pipe.

Baffles/Internal Baffles or walls corroding, Baffles repaired walls cracking, warping and/or or replaced to Vault Annually showing signs of failure as specifications. determined by maintenance/inspection person.

Access Ladder Ladder is corroded or Ladder replaced Damaged deteriorated, not functioning or repaired to properly, not securely specifications, Vault Quarterly attached to structure wall, and is safe to missing rungs, cracks, and use as misaligned. determined by inspection personnel.

City of Bremerton Stormwater Facilities Maintenance Manual Page 35

2d Dispersion Trenches

Dispersion trenches consist of an excavated trench backfilled with drain rock, containing a level perforated pipe, often with a catch basin on the pipe and a notched grade board. They are designed to spread out the flow of water over a broad surface area, to convert pipe flow to sheet flow and reduce the potential for erosion. These structures are typically found at the outlet areas of pipes, ponds or swales.

k ne ec What to How Problem or Conditions to Check What to do for o D Ch

Check Often Defect For Desired Condition

√ √

Add large rocks (about Dispersion Missing or Trench should be full of 30 lb. each) so that Annually Trench Moved Rock rip rap. rocks are visible above the edge of the trench.

Clean and flush pipe. Accumulated sediment In severe cases, the Dispersion Quarterly Pipe Plugged should not exceed 20% rocks will have to be Trench of the depth. removed, cleaned, and then replaced.

Ensure that at least half

Dispersion Perforations of the perforations in the Clean or replace Quarterly Trench Plugged pipe are not plugged with perforated pipe. debris or sediment. The intent of the If water is not being dispersion trench is to discharged correctly, prevent erosion. Water Semi- the trench must be Not should flow out of the Annually redesigned or rebuilt to Dispersion Discharging trench in a uniform "sheet & After standard. The Trench Water flow." Visually inspect the Major elevation of the lip of Properly trench for evidence of Storms the trench should be water discharging at the same (level) at all concentrated points and points. causing erosion. Water should not flow out Facility must be rebuilt

Semi- during storms smaller or redesigned to Annually Water flows than the design storm. standards. Dispersion & After out top of Also, ensure that it is not Pipe is probably Trench Major catch basin causing (and appears plugged or damaged Storms unlikely to cause) and needs damage. replacement.

Stabilize the slope with Semi- Ensure that the water in grass or other Annually Receiving the receiving area is not Dispersion vegetation. You might & After Area Over- causing, and does not Trench need to use rock or Major Saturated have the potential to other cover if the Storms cause, a landslide. condition is severe.

City of Bremerton Stormwater Facilities Maintenance Manual Page 36

2e Infiltration Trenches and Galleries

Infiltration trenches and galleries are often used to treat runoff from impervious surfaces, such as roads, sidewalks and parking lots. Both utilize perforated pipes surrounded by gravel to keep the perforations from becoming clogged and to help disperse the water into the soil.

Typical maintenance schedule and activities for infiltration trenches:

• Replace pea gravel/topsoil/surface filter fabric as needed. • Monthly: o Ensure the contributing area and inlets are clear of debris. o Ensure the contributing area is stabilized. o Remove sediment and oil/grease from pre-treatment devices. o Mow grass filter strips as necessary and remove grass clippings. • Semi-Annual Inspection: o Repair undercut and eroded areas at inflow and outflow. o Inspect pre-treatment devices and diversion structures for sediment build up and structural damage. • Every five years: o Disc or otherwise aerate the basin bottom. De-thatch the basin bottom. o Scrape basin bottom and remove sediment. o Restore original cross section and infiltration rate. Seed or sod to restore ground cover.

City of Bremerton Stormwater Facilities Maintenance Manual Page 37

Group 3

Structures and Pre-Treatment

City of Bremerton Stormwater Facilities Maintenance Manual Page 38

3a Control Structures and Flow Restrictors Flow control devices are usually placed within manholes, which may be locked. They typically consist of two pipes, one placed above the other. The lower pipe will typically have a cover and a small hole drilled in it to allow for slow release of water. The upper pipe is usually larger to provide an outlet for higher flows and emergency overflows.

ne o

What to How Problem or Conditions to What to do for D Check √ Check Often Defect Check for Desired Condition √

Trash and Material exceeds 25% Control structure orifice Quarterly Debris (includes of sump depth or 1 foot is not blocked. All trash Sediment) below orifice plate. & debris removed

Structure is not securely Securely attach

attached to manhole structure to wall and wall. outlet pipe.

Structure is not in Restore structure to upright position (more correct position. Structure than 10% from plumb) Quarterly Structural Damage Connections to outlet Pipe connections are pipe are not watertight water tight; structure and show signs of rust. repaired or replaced and works as designed. Any holes in structure Structure has no holes (other than designed other than designed holes). holes.

Cleanout gate is not Gate is watertight and watertight or is missing. works as designed. Gate cannot be moved Gate moves up and up and down by one down easily and is maintenance person. watertight. Cleanout Quarterly Damaged or Gate Missing Chain/rod leading to Chain is in place and gate is missing or works as designed. damaged. Gate is rusted over Gate is repaired or 50% of its surface area. replaced to meet design standards.

Control device is not Plate is in place and Damaged or working properly due to works as designed.

Missing missing, displaced, or Orifice Quarterly bent orifice plate. Plate Trash, debris, sediment Plate is free of all Obstructions or vegetation blocking obstructions and works the plate. as designed.

Any trash or debris Pipe is free of all Overflow blocking (or having the obstructions and works Quarterly Obstructions Pipe potential of blocking) as designed. the overflow pipe.

See “Detention Tanks See “Detention Tanks Manhole and Vaults” and Vaults” Catch See “Catch Basins” See “Catch Basins” Basin

City of Bremerton Stormwater Facilities Maintenance Manual Page 39

3b Catch Basins These structures are typically located in the streets. Unless identified through recorded documents, the City of Bremerton is responsible for routine maintenance of the pipes and structures in the public rights-of-way, while the property owner or homeowners association is responsible for maintenance of pipes and catch basins in private areas and for keeping the grates clear of debris in all areas.

k ne ec o

What Ch What to do for D How Problem or to Conditions to Check For Desired Often Defect √ √ Check Condition

Trash, leaves or debris which is Remove trash, located immediately in front of the leaves & debris catch basin (CB) opening or is located directly

blocking inflow capacity of the in front of CB or basin by more than 10%. on grate

Trash or debris (in basin) that Remove all exceeds 60 percent of the sump trash and debris depth as measured from bottom of from the catch basin to invert of the lowest pipe basin.

Trash & into or out of the basin, but in no Quarterly Debris case less than a minimum of 6” clearance from the debris surface to the invert of the lowest pipe.

Trash or debris in any inlet or outlet Inlet and outlet pipe blocking more than 1/3 of its pipes free of height. trash or debris. Dead animals or vegetation that Remove dead could generate odors that could animals, etc. cause complaints or dangerous present within gases (e.g. methane). the catch basin.

Sediment (in basin) exceeds 60% of No sediment in sump depth as measured from the the catch basin Catch Basin bottom of basin to invert of lowest Quarterly Sediment pipe into or out of basin, but in no case less than a minimum of 6” clearance from the sediment surface to the invert of lowest pipe.

Top slab has holes larger than 2 Top slab is free square inches or cracks wider than of holes and Structure 1/4 inch (Intent is to make sure no cracks. Damage to material is running into basin). Annually Frame Frame not sitting flush on top slab, Frame is sitting and/or Top i.e., separation of more than 3/4 flush on the Slab inch of the frame from the top slab. riser rings or top Frame not securely attached slab and firmly attached.

Fractures or Maintenance person determines Basin replaced Cracks in structure is unsound. or repaired to Basin Walls/ design standard Bottom Annually Grout fillet has separated or Pipe regrouted cracked wider than 1/2 inch and and secure at longer than 1 foot at the joint of basin wall. any inlet/outlet pipe, or any evidence of soil entering basin.

City of Bremerton Stormwater Facilities Maintenance Manual Page 40

3b Catch Basins (continued)

k ne

What ec What to do for How Problem or o D

to Conditions to Check For Ch Desired

Often Defect Check Condition √ √

If failure of basin has created Replaced or Settlement/ Annually a safety, function, or design repair to design Misalignment problem. standards.

Vegetation growing across Remove and blocking more than 10% vegetation of the basin opening. blocking opening to basin. Quarterly Vegetation Vegetation growing in No vegetation or inlet/outlet pipe joints that is root growth more than six inches tall and present. less than six inches apart.

Contamination See "Detention Ponds" No pollution and Pollution present.

Catch Cover is missing or only Catch basin cover Basin Quarterly Cover Not in partially in place. Any open is closed Place catch basin requires maintenance.

Mechanism cannot be opened Mechanism opens Locking by one maintenance person with proper tools. Quarterly Mechanism Not with proper tools. Bolts into Working frame have less than 1/2 inch of thread.

One maintenance person Cover can be cannot remove lid after removed by one applying normal lifting maintenance Quarterly Cover Difficult to pressure. person. Remove (Intent is keep cover from sealing off access to maintenance.)

Cover is missing or only Catch basin cover Quarterly Cover Not in partially in place. Any open is closed Place catch basin requires maintenance.

Mechanism cannot be opened Mechanism opens Locking by one maintenance person with proper tools. Quarterly Mechanism Not with proper tools. Bolts into Catch Working frame have less than 1/2 inch Basin of thread. Cover One maintenance person Cover can be cannot remove lid after removed by one applying normal lifting maintenance Quarterly Cover Difficult to pressure. person. Remove (Intent is keep cover from sealing off access to maintenance.)

City of Bremerton Stormwater Facilities Maintenance Manual Page 41

3b Catch Basins (continued)

k ne

ec What to How Problem What to do for o D

Conditions to Check For Ch

Check Often or Defect Desired Condition

√ √

Ladder is unsafe due to Ladder meets design Ladder missing rungs, not securely standards and allows Ladder Quarterly Rungs attached to basin wall, maintenance person Unsafe misalignment, rust, cracks, safe access. or sharp edges.

Grate Grate with opening wider Grate opening meets Quarterly opening than 7/8 inch. design standards. Unsafe

Metal Trash and debris that is Grate free of trash blocking more than 20% of Grates Quarterly Trash and and debris. (If Debris grate surface inletting Applicable) capacity.

Grate missing or broken Grate is in place and Damaged Quarterly member(s) of the grate. meets design or Missing standards.

City of Bremerton Stormwater Facilities Maintenance Manual Page 42

3c Debris Barriers (Trash Racks)

A metallic screen or similar structural device used to prevent debris from entering a pipe, spillway or other hydraulic structure.

k ne

What ec How Problem or What to do for o D

to Conditions to Check For Ch

Often Defect Desired Condition Check √ √

Trash or debris that is Barrier cleared to Trash and General Quarterly plugging more than 20% of design flow capacity. Debris the openings in the barrier.

Bars are bent out of shape Bars in place with no more than 3 inches. bends more than 3/4 inch.

Quarterly Damaged/ Bars are missing or entire Bars in place Missing Bars barrier missing. according to design. Metal Bars are loose and rust is Barrier replaced or causing 50% deterioration to repaired to design any part of barrier. standards.

Quarterly Inlet/Outlet Debris barrier missing or not Barrier firmly Pipe attached to pipe attached to pipe

City of Bremerton Stormwater Facilities Maintenance Manual Page 43

3d Energy Dissipators

Typically a rock splash pad at a pipe end or other discharge location, to reduce the velocity and energy of flowing water and prevent erosion. Other means of energy dissipation include drop manholes, stilling basins, and check dams.

k ne

ec What to do How Problem or Conditions to Check o D

What to Check Ch for Desired

Often Defect For Condition √ √

Only one layer of rock Rock pad exists above native soil in replaced to Missing or Quarterly area five square feet or design Moved Rock larger, or any exposure of standards. Rock Pad native soil.

Soil erosion in or adjacent Rock pad to rock pad. replaced to Quarterly Erosion design standards.

Accumulated sediment Pipe cleaned/ Quarterly Pipe Plugged that exceeds 20% of the flushed so it with Sediment design depth. matches design.

Visual evidence of water Trench discharging at redesigned Not concentrated points along or rebuilt to Quarterly Discharging trench (normal condition standards. Water Properly is a “sheet flow” of water along trench). Intent is to prevent erosion damage.

Over half of perforations Perforated Perforations Quarterly in pipe are plugged with pipe cleaned Dispersion Trench Plugged. debris and sediment. or replaced.

Maintenance person Facility rebuilt observes or receives or redesigned Water Flows credible report of water to standards. Quarterly Out Top of flowing out during any “Distributor” storm less than the Catch Basin. design storm or its causing or appears likely to cause damage.

Water in receiving area is No danger of Quarterly Receiving Area causing or has potential landslides. Over-Saturated of causing landslide problems.

Structure dissipating flow Structure deteriorates to 1/2 of replaced to Worn or original size or any design Damaged Post, Annually concentrated worn spot standards. Baffles, Side of Manhole/Chamber Chamber exceeding one square foot which would make structure unsound.

See “Catch Basins” See “Catch Other Defects Basins”

City of Bremerton Stormwater Facilities Maintenance Manual Page 44

3e Baffle Oil/Water Separators (API Type)

An underground vault or tank designed to separate oil from runoff water via baffles.

k ne

What ec How Problem or What to do for o D

to Conditions to Check For Ch

Often Defect Desired Condition Check √ √

Inspect discharge water for Effluent discharge Dirty obvious signs of poor water from vault should be Quarterly Discharge quality. clear without thick Water visible sheen.

Sediment depth in bottom of Remove sediment vault exceeds 6-inches in deposits that would

Quarterly Sediment depth. impede flow through Accumulation the vault and reduce separation efficiency.

Trash and debris accumulation Remove trash and Trash and in vault, or pipe inlet/outlet, debris from vault Quarterly Debris floatables and non-floatables. and inlet/outlet Accumulation piping.

Oil accumulations that exceed Extract oil from 1-inch, at the surface of the vault by vactoring. water. Quarterly Oil Disposal must be in Accumulation accordance with state and local rules and regulations.

Inlet or outlet piping damaged Pipe repaired or Damaged Quarterly or broken and in need of replaced. Pipes repair. General

Cover cannot be opened, Cover repaired to Access Cover corrosion/deformation of proper working Quarterly Damaged/Not cover. specifications or Working replaced.

Vault Vault replaced or Structure repairs made so that Damage - See “Catch Basins” vault meets design Cracks in specifications and is Annually Walls or structurally sound. Bottom, Damage to Frame and/or Top Slab

Baffles corroding, cracking, Baffles repaired or warping and/or show signs of replaced to Annually Baffles failure as determined during specifications. inspection.

Ladder is corroded or Ladder replaced or deteriorated, not securely repaired and meets Access attached to structure wall, specifications, and is Annually Ladder missing rungs, cracks, or safe to use as Damaged misaligned. determined by inspection.

City of Bremerton Stormwater Facilities Maintenance Manual Page 45

3f Coalescing Plate Oil/Water Separators

An underground vault or tank designed to separate oil from runoff water via gravity.

k

What ec What to do for How Problem or

to Conditions to Check For Desired Done Ch

Often Defect Check Condition √ √

Inspect discharge water for Effluent discharge Dirty Discharge obvious signs of poor water from vault should Quarterly Water quality. be clear with no thick visible sheen

Sediment depth in bottom of No sediment on vault exceeds 6-inches in vault bottom and

depth and/or visible signs of plate media, sediment on plates. which would Sediment Quarterly impede flow Accumulation through the vault and reduce separation efficiency.

Trash and debris accumulated Trash and debris Trash and Quarterly in vault, or pipe inlet/outlet, removed from Debris floatables. vault.

Oil accumulation that exceeds Oil is extracted 1-inch at the water surface. from vault.

Coalescing plates Quarterly Oil Accumulation are cleaned. There should be no visible oil depth on water. Damaged Plate media broken, deformed, Repaired or General Annually Coalescing cracked and/or showing signs replaced. Plates of failure.

Inlet or outlet piping damaged Pipe repaired and Annually Damaged Pipes or broken or in need of repair. or replaced. Baffles showing signs of failure Baffles repaired or Annually Baffles as determined during replaced to maintenance/inspection. specifications.

Vault Structure Cracks wider than 1/2-inch or Vault replaced or Damage - evidence of soil particles repairs made so Includes entering the structure through that vault meets Annually Cracks. the cracks, or design Damage to maintenance/inspection specifications and Frame and/or personnel determine that the is structurally Top Slab vault is not structurally sound. sound.

Cracks wider than 1/2-inch at Vault repaired to Annually the joint of any inlet/outlet designed pipe or soil particles entering condition. through the cracks.

Ladder is corroded or Replace or repair deteriorated, not functioning ladder so it meets Access Ladder Annually properly, not securely specifications and Damaged attached to structure wall, is safe to use as missing rungs, cracks, and determined by misaligned. inspection. City of Bremerton Stormwater Facilities Maintenance Manual Page 46

3g Catch Basin Inserts

A structure within a catch basin, with a filter containing a pollutant-removal medium. Generally considered as an alternative to oil-water separators, these are not commonly used for permanent installations, as they tend to be maintenance-intensive.

k ne

What ec What to do for How Problem or o D

to Conditions to Check For Ch Desired

Often Defect Check Condition √ √

When sediment forms a cap No sediment cap Sediment Quarterly over the insert media of the on the insert media Accumulation insert and/or unit. and its unit.

Trash and debris Trash and debris accumulates on insert unit removed from Trash and Debris Quarterly creating a insert unit. Runoff Accumulation blockage/restriction. freely flows into catch basin.

Effluent water from media Effluent water from insert has a visible sheen. Quarterly Media Insert Not media insert is free Removing Oil of oils and has no visible sheen. General Catch basin insert is Remove and Quarterly Media Insert saturated with water and no replace media Water Saturated longer has the capacity to insert absorb.

Media oil saturated due to Remove and Media Insert-Oil Quarterly petroleum spill that drains replace media Saturated into catch basin. insert.

Media has been used Remove and Media Insert Use beyond the typical average replace media at Quarterly Beyond Normal life of media insert product. regular intervals, Product Life depending on insert product.

City of Bremerton Stormwater Facilities Maintenance Manual Page 47

Group 4

Miscellaneous Facilities and Features

City of Bremerton Stormwater Facilities Maintenance Manual Page 48

4a Downspouts and Roof Drywells

These facilities dispose of stormwater from roofs and clean impervious surfaces.

k ne ec What to How Problem Conditions to What to do for Desired o D Ch

Check Often or Defect Check For Condition

√ √

Water overflows First try cleaning out the gutter from the gutter and downspouts. If this doesn’t Downspout Annually Overflow or downspout solve the problem, a larger during rain. drywell may be needed. Disconnect the flexible part of the downspout that leads to the

Moss and algae drywell. Then perform moss are taking over removal as desired. Pressure Roof Annually Moss the shadier parts wash or use fatty acid solutions of the shingles. instead of highly toxic pesticides or chlorine bleach. Install a zinc strip as a preventative.

City of Bremerton Stormwater Facilities Maintenance Manual Page 49

4b Conveyance Pipes, Ditches and Swales

These features contain and direct the flow of water from one location to another.

k ne

What ec How Problem or What to do for o D

to Conditions to Check For Ch

Often Defect Desired Condition Check √ √

Accumulated sediment should not exceed 20% of the diameter of the pipe. Clean out pipes of

Vegetation should not reduce all sediment and

free movement of water debris. Remove all Sediment, through pipes. Ensure that the vegetation so that Pipes Annually Debris, & protective coating is not water flows freely Vegetation damaged or rusted. Dents through pipes. should not significantly impede Repair or replace flow. Pipe should not have pipe. major cracks or flaws allowing water to leak out. Remove trash and

Trash & There should not be any yard debris and dispose Quarterly Debris waste or litter in the ditch. of them properly. Open Ditches Accumulated sediment should Clean out ditch of Sediment Annually not exceed 20% of the depth of all sediment and Buildup the ditch. debris. Clear blocking

Check for vegetation (e.g., vegetation so that Overgrowth weedy shrubs or saplings) that water moves freely Annually of reduces the free movement of through the ditches. Vegetation water through ditches or Grassy vegetation swales. should be left alone. Open Eliminate causes of Check around inlets and outlets Ditches erosion. Stabilize for signs of erosion. Check and slopes by using the slopes for signs of sloughing or Swales appropriate erosion Quarterly Erosion settling. Action is needed control procedure where eroded damage is over (e.g. compact the 2" deep and where there is soil, plant grass, potential for continued erosion. reinforce with rock).

Native soil beneath the rock Missing Replace rocks to Annually splash pad, check dam, or lining Rocks design standard. should not be visible.

City of Bremerton Stormwater Facilities Maintenance Manual Page 50

4b Conveyance Pipes, Ditches and Swales (continued)

k ne

What ec How Problem or Conditions to What to do for Desired o D

to Ch

Often Defect Check For Condition Check √ √

Aerate soils and re-seed and Grass cover is sparse mulch bare areas. Keep grass and weedy, or areas Quarterly Vegetation less than 8" high. Remove are overgrown with woody growth, re-contour & woody vegetation. re-seed as necessary.

Speak with the homeowner Swale has been filled and request that the swale Homeowner in or blocked by Quarterly area be restored. Contact the Swales Conversion shed, woodpile, City to report the problem if shrubbery, etc. not rectified voluntarily. A survey may be needed to

Water stands in the check grades. Grades should Swale does swale, or flow be in 1-5% range if possible. Annually not drain velocity is very slow. If grade is less than 1%, Stagnation occurs. under-drains may need to be installed.

4c Access Roads & Easements

These features provide access to drainage facilities for inspection and/or maintenance.

k ne ec What to How Problem Conditions to Check What to do for Desired o D Ch

Check Often or Defect For Condition

√ √

Check to determine if If there is not adequate

there is adequate access, check with the City One access to your to determine whether an General Access Time stormwater facilities easement exists. If so, a for maintenance maintenance road may vehicles. need to be constructed

Debris that could Blocked Clear all potentially damaging Quarterly damage vehicle tires Roadway material. (glass or metal).

Access Any obstructions Road which reduce Clear above and along Blocked Annually clearance above and roadway so there is Roadway along the road to less enough clearance. than 14 feet.

Check for potholes, ruts, mushy spots, or Road Bad Road Add gravel or remove wood Annually woody debris that Surface Conditions as necessary. limits access by maintenance

Shoulders Check for erosion Repair erosion with additional and Annually Erosion along roadway. soil or gravel. Ditches

City of Bremerton Stormwater Facilities Maintenance Manual Page 51

Group 5

Proprietary Treatment Systems

City of Bremerton Stormwater Facilities Maintenance Manual Page 52

5a Modular Wetlands Systems

Bio Clean’s Modular Wetlands Systems combine a pretreatment chamber which includes separation and filter cartridges, with biofiltration to remove TSS, metals, nutrients, hydrocarbons, and bacteria. These come in curb, grate, vault, and downspout types. General maintenance actions are followed by an inspection report and a maintenance report created by the manufacturer. Further information is available at the manufacturer’s website https://biocleanenvironmental.com/modular-wetlands-system-linear/

City of Bremerton Stormwater Facilities Maintenance Manual Page 53

City of Bremerton Stormwater Facilities Maintenance Manual Page 54

City of Bremerton Stormwater Facilities Maintenance Manual Page 55

5b Filterra Tree Vault

Filterra Tree Vaults are similar to bioretention, but suitable for higher flows and amounts of pollutants. More infomation available at the manufacturer’s website. https://www.conteches.com/stormwater-management/biofiltration-bioretention/filterra

Each maintenance visit consists of the following general tasks:

• Inspection of Filterra and surrounding area • Removal of tree grate and erosion control stones • Removal of debris, trash and mulch • Mulch replacement • Plant health evaluation and pruning or replacement as necessary • Clean area around Filterra • Complete paperwork

City of Bremerton Stormwater Facilities Maintenance Manual Page 56

City of Bremerton Stormwater Facilities Maintenance Manual Page 57

5c Contech Jellyfish Filter

The Jellyfish filter is a stormwater treatment featuring high flow pretreatment and membrane filtration in a stand-alone system. Jellyfish removes trash, oil, suspended sediment, and pollutants including phosphorus, nitrogen, metals and hydrocarbons. More information is available at https://www.conteches.com/stormwater-management/treatment/jellyfish-filter

City of Bremerton Stormwater Facilities Maintenance Manual Page 58

The inspection and maintenance log below is provided by the manufacturer. For personal safety and to protect the filter from damage, follow the manufacturer’s full protocol for inspections and maintenance, Appendix (2).

City of Bremerton Stormwater Facilities Maintenance Manual Page 59

5d Contech CDS Hydrodynamic Separator

The CDS hydrodynamic separator uses swirl concentration and continuous deflective separation to screen, separate, and trap trash, debris sediment, and hydrocarbons from stormwater runoff. The CDS system should be inspected at regular intervals and maintained when necessary to ensure optimum performance. The rate at which the system collects pollutants will depend more heavily on site activities than the size of the unit. For example, unstable soils or heavy winter sanding will cause the grit chamber to fill more quickly but regular sweeping of paved surfaces will slow accumulation.

The water depth to sediment (see inspection log below) is determined by taking two measurements with a stadia rod: one measurement from the manhole opening to the top of the sediment pile and the other from the manhole opening to the water surface. If the difference between these measurements is less than the values listed in the table below, the system should be cleaned out.

For optimum performance, the system should be cleaned out when the floating hydrocarbon layer accumulates to an appreciable thickness. In the event of an oil spill, the system should be cleaned immediately.

City of Bremerton Stormwater Facilities Maintenance Manual Page 60

City of Bremerton Stormwater Facilities Maintenance Manual Page 61

City of Bremerton Stormwater Facilities Maintenance Manual Page 62

5e Contech Stormfilter

The Stormfilter uses rechargeable, media-filled cartridges to absorb and retain the most challenging pollutants from stormwater runoff, including total suspended solids, hydrocarbons, nutrients, metals and other common pollutants.

City of Bremerton Stormwater Facilities Maintenance Manual Page 63

Maintenance and Inspection Forms have been provided by the manufacturer. Complete instructions can be found on the manufacturer’s website, in Maintenance Guides. https://www.conteches.com/technical-guides/search

City of Bremerton Stormwater Facilities Maintenance Manual Page 64

City of Bremerton Stormwater Facilities Maintenance Manual Page 65

5f Other Proprietary System Manufacturers

Other proprietary stormwater systems include:

BioPod Biofilter (formerly TreePod) • Manufactured by Oldcastle Infrastructure • https://oldcastleinfrastructure.com/brands/biopod/

Gullywasher catchbasin inserts, blue filter gabions • http://gullywasher.com/

BayFilter stormwater filter cartridge • Manufactured by BaySaver Technologies • https://baysaver.com/stormwater-filters/

BioChar filters, catch basin inserts, and other products • http://stormwaterbiochar.com/

AquaShield stormwater treatments • https://www.aquashieldinc.com/

Rotondo Environmental Solutions stormwater treatments • http://www.rotondo-es.com/Products.html

StormwateRx treatment systems • https://stormwaterx.com

City of Bremerton Stormwater Facilities Maintenance Manual Page 66

City of Bremerton Stormwater Facilities Maintenance Manual Page 67

City of Bremerton Stormwater Facilities Maintenance Manual Page 68

Glossary of Stormwater Terms

Best Management Practices (BMPs) – Structural features or procedures that reduce the adverse impacts of development on the quantity and/or quality of runoff water.

Biofilter (Swale) – A wider and flatter vegetated version of a ditch over which runoff flows at a uniform depth and velocity. Biofilters perform best when vegetation has a thick mat of roots, leaves, and stems at the soil interface (such as grass).

Biofiltration – The process through which pollutant concentrations in runoff water are reduced by filtering runoff through vegetation.

Bioretention – The process through which pollutants in runoff water are reduced by filtering through a designed soil mixture and plant complex, and infiltrating into the native soil below. The chemical, biological and physical properties of plants, soil microbes, and the soil mixture’s mineral aggregate and organic matter transforms, removes and retains stormwater pollutants.

Buffer – The zone along a sensitive aquatic area that provides protection, stability, shading, slope and bank stabilization, and input of organic debris and coarse sediments to streams. It allows room for variation in aquatic system boundaries, attenuation of surface water flows, habitat for wildlife, and protection from disturbance or intrusion by humans or domestic animals.

Catch Basin – An inlet box set into the ground, usually rectangular and made of concrete, capped with a grate that allows stormwater to enter. A sump in the bottom catches sediment.

Check Dam – A dam (of rock, logs, etc.) built in a gully or drainage channel to reduce flow velocity, minimize erosive scouring, promote sediment deposition, and/or enhance infiltration.

Compost Stormwater Filter – A treatment facility that removes sediment and pollutants from stormwater by percolating water through a layer of specially-prepared Bigleaf maple compost. Clean water exits the bottom of the facility through a pipe.

Constructed Wetland – A wet pond with dead storage at various depths and planted with wetland plants to enhance its treatment capabilities.

Control Structure or Flow Restrictor – A manhole and/or pipe structure with a flow- regulating or metering device such as a weir or plates with small holes known as orifices. The structure controls the rate at which water leaves the pond.

Conveyance – A mechanism or device for transporting water, including gutters, pipes, channels (natural or man-made), culverts, manholes, etc.

Critical Areas – Areas such as wetlands, streams, steep slopes, etc., as defined by ordinance or resolution by the jurisdiction. Also known as environmentally-sensitive areas.

Culvert – A conveyance device (e.g. concrete, metal or plastic pipe) which conveys water from a ditch, swale, or stream under (usually across) a roadway, driveway or embankment.

Dead Storage – The volume of storage in a wetpond below the outlet which does not drain after a storm event. This pool provides stormwater treatment by settling-out sediments. City of Bremerton Stormwater Facilities Maintenance Manual Page 69

Detention Facility – A facility (e.g. a pond, vault, or pipe) in which surface water or stormwater is temporarily stored.

Detention Pond – A detention facility in the form of an open pond. Water is collected and detained in the pond as it’s released at a reduced rate.

Dispersion Trench – An open-top trench filled with rip rap or gravel that takes the discharge from a pond, spreads it out, and releases the flow out along its entire length. Dispersion trenches are used to spread-out discharge water to simulate unconcentrated “sheet flow” of stormwater from an area, and are often used to protect sensitive areas.

Drainage System – A combination of facilities for the collection, conveyance, containment, treatment, discharge and/or disposal of stormwater runoff.

Drop Structure – A structure for dropping water to a lower elevation and/or dissipating energy. A drop may be vertical or inclined.

Dry Pond – Casual name for an Infiltration Basin, a detention facility that drains completely after a storm. This type of pond has a pipe outlet at the bottom.

Easement – A legal encumbrance placed against a property’s title to reserve access. Drainage easements typically provide access to pipes and/or ponds, and are generally 15 to 20 feet wide.

Emergency Overflow or Spillway – An area on the top edge of a pond that is slightly lower in elevation and is normally lined with riprap for erosion protection. The emergency overflow is used only if the primary and secondary outlets of the pond fail, in the event of extreme storms, or if the infiltration capability of the pond becomes significantly diminished. If the emergency overflow ever comes into play, it may mean that the pond needs to be upgraded.

Energy Dissipator – A rock pad at an outlet (of a pipe, channel, etc.) designed to slow the flow velocity, spread out the water leaving the outlet, and reduce the potential for erosion.

Freeboard – The vertical distance between the design high water mark and the top rim of a pond (or other structure). Most ponds have one to two feet of freeboard to prevent them from overflowing.

Infiltration – The soaking of water through the soil surface into the ground (percolation is essentially the same thing). Many ponds are designed to infiltrate or retain stormwater, and thus do not have a regularly used discharge pipe.

Infiltration Facility (or Structure) – A facility (pond or trench) which retains and percolates stormwater into the ground, having no discharge (to any surface water) under normal operating conditions.

Junction – Point where two or more drainage pipes or channels converge (e.g. a manhole).

Jurisdiction – City or county, such as the City of Bremerton or Kitsap County (as applicable).

Lined Pond or Conveyance – A facility, the bottom and sides of which have been made impervious (using, for example, a plastic liner or clay/silt soil layer) to the transmission of liquids.

City of Bremerton Stormwater Facilities Maintenance Manual Page 70

Live Storage – The volume of storage in a pond above the outlet, which drains after a storm event. This storage capacity provides flood control and habitat protection for nearby streams.

Manhole – A larger version of the catch basin, often a cylindrical concrete structure with a circular solid lid. Manholes allow access to buried pipes (such as storm sewers) for maintenance.

Natural Channel – A stream, creek, river, lake, wetland, estuary, gully, swale, ravine, or any open conduit where water will concentrate and flow intermittently or continuously.

Oil-Water Separator – A structure or device used to remove oil and greasy solids from water. They operate by using gravity separation of liquids that have different densities. Many catch basins have a down- turned plastic elbow that provides some oil-water separation.

Outfall – The point where water flows from a man-made conduit, channel, or drain into a water body or other natural drainage feature.

Retention Facility – A facility that is designed to retain water and allow for infiltration.

Retention Pond – A retention facility that is an open basin or “pond."

Revetments – Materials such as rock or keystones used to sustain an embankment, such as in a retaining wall.

Riprap – Broken rock, cobbles, or boulders placed on earth surfaces, such as on top of a berm for the emergency overflow, along steep slopes, or at the outlet of a pipe, for protection against the erosive action of water. Also used for entrances to construction sites, to prevent sediment tracking.

Runoff – The portion of water originating as precipitation that becomes surface flow. See “stormwater” below.

Sand Filter – A treatment facility that removes pollutants and sediments from stormwater by percolating stormwater through a layer of sand. Clean water exits the bottom of the facility through a pipe.

Stormwater – The portion of precipitation that falls on property and that does not naturally percolate into the ground or evaporate, but flows via overland flow, interflow, pipes or other features into a defined surface water body or a constructed infiltration facility.

Swale – A shallow surface drainage conveyance with relatively gentle side slopes, generally with flow depths less than 1 foot. A broad and flat-bottomed ditch. See “biofilter.”

Trash Rack or Bar Screen – A device (usually a screen or bars) that fits over a pipe opening to prevent large debris such as rocks or branches from entering and partially blocking the pipe.

Wet Pond – A stormwater treatment pond designed with a “dead storage” volume to maintain a continuous or seasonal static water level below the pond outlet elevation.

Appendix 1 – Structural and Design Specifications For Stormwater from the 2014 Western Washington Stormwater Management Manual

72

Figure 4.2.1 – Typical Grass-Lined Channels

73

74 Figure 3.1.2 - Typical Downspout Infiltration Trench

75 Figure 3.1.3 - Alternative Downspout Infiltration Trench System for Coarse Sand and Gravel Source: King County

76 Source: King County

77

Appendix 2 – Complete Inspection and Maintenance Protocol for the Jellyfish Filter

78 Filter

79

80 WARNINGS / CAUTION 1. FALL PROTECTION may be required. 2. WATCH YOUR STEP if standing on the Jellyfish Filter Deck at any time; Great care and safety must be taken while walking or maneuvering on the Jellyfish Filter Deck. Attentive care must be taken while standing on the Jellyfish Filter Deck at all times to prevent stepping onto a lid, into or through a cartridge hole or slipping on the deck. 3. The Jellyfish Filter Deck can be SLIPPERY WHEN WET. 4. If the Top Slab, Covers or Hatches have not yet been installed, or are removed for any reason, great care must be taken to NOT DROP ANYTHING ONTO THE JELLYFISH FILTER DECK. The Jellyfish Filter Deck and Cartridge Receptacle Rings can be damaged under high impact loads.This type of activity voids all warranties. All damaged items to be replaced at owner's expense. 5. Maximum deck load 2 persons, total weight 225 lbs. per person.

Safety Notice Jobsite safety is a topic and practice addressed comprehensively by others. The inclusions here are intended to be reminders to whole areas of Safety Practice that are the responsibility of the Owner(s), Manager(s) and Contractor(s). OSHA and Canadian OSH, and Federal, State/Provincial, and Local Jurisdiction Safety Standards apply on any given site or project. The knowledge and applicability of those responsibilities is the Contractor’s responsibility and outside the scope of Contech Engineered Solutions.

Confined Space Entry Secure all equipment and perform all training to meet applicable local and OSHA regulations regarding confined space entry. It is the Contractor’s or entry personnel’s responsibility to proceed safely at all times.

Personal Safety Equipment Contractor is responsible to provide and wear appropriate personal protection equipment as needed including, but not limited to safety boots, hard hat, reflective vest, protective eyewear, gloves and fall protection equipment as necessary. Make sure all equipment is staffed with trained and/or certified personnel, and all equipment is checked for proper operation and safety features prior to use.

• Fall protection equipment • Eye protection • Safety boots • Ear protection • Gloves • Ventilation and respiratory protection • Hard hat • Maintenance and protection of traffic plan Thank You for purchasing the Jellyfish® Filter!

Contech Engineered Solutions would like to thank you for selecting the Jellyfish Filter to meet your project’s stormwater treatment needs. With proper inspection and maintenance, the Jellyfish Filter is designed to deliver ongoing, high levels of stormwater pollutant removal.

81 If you have any questions, please feel free to call us or e-mail us at [email protected].

Contech Engineered Solutions 9025 Centre Pointe Drive, Suite 400 West Chester, OH 45069 Phone: 800-338-1122 www.ContechES.com

Jellyfish Filter Patents

The Jellyfish Filter is protected by one or more of the following patents:

U.S. Patent No. 8,123,935; U.S. Patent No. 8,287,726; U.S. Patent No. 8,221,618

Australia Patent No. 2008,286,748

Canadian Patent No. 2,696,482

Korean Patent No. 10-1287539

New Zealand Patent No. 583,461; New Zealand Patent No. 604,227

South African Patent No. 2010,01068

*other patents pending

Table of Contents Chapter 1 1.0 Owner Specific Jellyfish Product Information 6

Chapter 2 2.0 Jellyfish Filter System Operations & Functions 7

2.1 Components & Cartridges 8

2.2 Jellyfish Membrane Filtration Cartridges Assembly 9

2.3 Installation of Jellyfish Membrane Filtration Cartridges 9

Chapter 3 3.0 Inspection and Maintenance Overview 10

3.1 Inspection 10

3.2 Maintenance 14

3.3 Disposal Procedures 15

Chapter 4

82 4.0 Recommended Safety Procedures 15

4.1 Confined Space/Personal Safety Equipment/Warnings and Caution 15

Chapter 5 5.0 Jellyfish Filter Replacement Parts 15

5.1 Jellyfish Filter Replacement Parts List 15

Forms Jellyfish Filter Inspection and Maintenance Log 16

List of Figures Figure 1 – Jellyfish Filter Treatment Functions 7

Figure 2 – Jellyfish Filter Components 8

Figure 3 – Jellyfish Membrane Filtration Cartridge 9

List of Tables Table 1 – Cartridge Lengths / Weights and Cartridge Lid Orifice Diameters 8

Chapter 1 1 – Owner Specific Jellyfish Filter Product Information Below you will find a reference page that can be filled out according to your Jellyfish Filter specification to help you easily inspect, maintain and order parts for your system.

Owner Name:

Phone Number:

Site Address:

Site GPS Coordinates/unit location:

Unit Location Description:

Jellyfish Filter Model No.:

Cartridge Installation Date:

No. of Hi-Flo Cartridges

Length of Hi-Flo Cartridges:

Lid Orifice Diameter on Hi-Flo Cartridge:

No. of Draindown Cartridges:

Length of Draindown Cartridges: Lid Orifice Diameter on Draindown Cartridge: No. of Blank Cartridge Lids:

83 Online System (Yes/No):

Offline System (Yes/No): Notes: ______Chapter 2 2.0 – Jellyfish Filter System Operations and Functions The Jellyfish Filter is an engineered stormwater quality treatment technology that removes a high level and wide variety of stormwater pollutants. Each Jellyfish Filter cartridge consists of multiple membrane - encased filter elements (“filtration tentacles”) attached to a cartridge head plate. The filtration tentacles provide a large filtration surface area, resulting in high flow and high pollutant removal capacity.

The Jellyfish Filter functions are depicted in Figure 1 below.

FIGURE 1 Jellyfish Filter Treatment Functions Membrane Filtration Section View with Maintenance Access Wall (MAW) Cutaway

Effluent Pipe Influent Pipe

Floatables Filtered Water Collection

Particles FIltered

Particles Settling

Jellyfish Filter cartridges are backwashed after each peak storm event, which removes accumulated sediment from the membranes. This backwash process extends the service life of the cartridges and increases the time between maintenance events.

For additional details on the operation and pollutant capabilities of the Jellyfish Filter please refer to additional

84 details on our website at www.ContechES.com.

2.1 – Components and CartridgesTentacles are available in various lengths as depicted in Table 1 below.

Table 1 – Cartridge Lengths / Weights and Cartridge Lid Orifice Diameters Cartridge Lengths Dry Weight Hi-Flo Orifice Drain down Orifice Diameter Diameter 15 inches (381 mm) 10 lbs (4.5 kg) 35 mm 20 mm

27 inches (686 mm) 14.5 lbs (6.6 kg) 45 mm 25 mm

40 inches (1,016 mm) 19.5 lbs (8.9 kg) 55 mm 30 mm

54 inches (1,372 mm) 25 lbs (11.4 kg) 70 mm 35 mm A Jellyfish membrane filtration cartridge is depicted in Figure 3 below.

FIGURE 3 Jellyfish Membrane Filtration Cartridge Head Plate Lifting Loops

Locking Nuts ( above headplate ) O-Ring Gasket ( below headplate ) Tentacles

2.2 – Jellyfish Membrane Filtration Cartridge Assembly The Jellyfish Filter utilizes multiple membrane filtration cartridges. Each cartridge consists of removable cylindrical filtration “tentacles” attached to a cartridge head plate. Each filtration tentacle has a threaded pipe nipple and o- ring. To attach, insert the top pipe nipples with the o-ring through the head plate holes and secure with locking nuts. Locking nuts to be hand tighten and checked with a wrench as shown below.

85 2.3 – Jellyfish Membrane Filtration Cartridge Installation • After the upstream catchment and site have stabilized, remove any accumulated sediment and debris from the Jellyfish Filter structure and upstream diversion structure (if applicable). Failure to address this step completely will reduce the time between required maintenance. • Descend to the cartridge deck (see Safety Notice and page 3). • Lower the Jellyfish membrane filtration cartridges into the cartridge receptacles within the cartridge deck. A filter cartridge should be placed into each of the draindown cartridge receptacles outside the backwash pool weir. It is possible dependent on the Jellyfish Filter model purchased that not all cartridge receptacles will be filled with a filter cartridge. In that case, a blank headplate and blank cartridge lid (has no orfice) would be installed. Cartridge Assembly

Avoid snagging the cartridge membranes on the recpticle lip when inserting the Jellyfish membrane filtration cartridges into the cartridge receptacles. Use a gentle twisting or sideways motion to clear any potential snag. Do not force the tentacles down into the cartridge receptacle, as this may damage the membranes. Apply downward pressure on the cartridge head plate to seat the rim gasket (thick circular gasket surrounding the circumference of the head plate) into the cartridge receptacle.

• Examine the cartridge lids to differentiate lids with a small orifice, a large orifice, and no orifice. • Lids with a small orifice are to be inserted into the draindown cartridge receptacles, outside of the backwash pool weir. • Lids with a large orifice are to be inserted into the hi-flo cartridge receptacles within the backwash pool weir. • Lids with no orifice (blank cartridge lids) and a blank headplate are to be inserted into unoccupied cartridge receptacles. • To install a cartridge lid, align the cartridge lid male threads with the cartridge receptacle female threads. Firmly twist the cartridge lid clockwise a minimum 110º to seat the filter cartridge snugly in place, with a proper watertight seal.

Chapter 3 3.0 – Inspection and Maintenance Overview The primary purpose of the Jellyfish Filter is to capture and remove pollutants from stormwater runoff. As with any filtration system, captured pollutants must be removed to maintain the filter’s maximum treatment performance. Regular inspection and maintenance are required to insure proper functioning of the system.

Maintenance frequencies and requirements are site specific and vary depending on pollutant loading. Maintenance activities may be required in the event of an upstream chemical spill or due to excessive sediment loading from site erosion or extreme runoff events. It is a good practice to inspect the system after major storm events.

Inspection activities are typically conducted from surface observations and include:

• Observe if standing water is present

86 • Observe if there is any physical damage to the deck or cartridge lids • Observe the amount of debris in the Maintenance Access Wall (MAW)

Maintenance activities typically include:

• Removal of oil, floatable trash and debris • Removal of collected sediments from manhole sump • Rinsing and re-installing the filter cartridges • Replace filter cartridge tentacles, as needed.

It is recommended that Jellyfish Filter inspection and maintenance be performed by professionally trained individuals, with experience in stormwater maintenance and disposal services. Maintenance procedures may require manned entry into the Jellyfish structure. Only professional maintenance service providers trained in confined space entry procedures should enter the vessel. Procedures, safety and damage prevention precautions, and other information, included in these guidelines, should be reviewed and observed prior to all inspection and maintenance activities.

3.1 – Inspection 3.1.1 – Timing Inspection of the Jellyfish Filter is key in determining the maintenance requirements for, and to develop a history of the site’s pollutant loading characteristics. In general, inspections should be performed at the times indicated below; or per the approved project stormwater quality documents (if applicable), whichever is more frequent.

• Post-construction inspection is required prior to putting the Jellyfish Filter into service. All construction debris or construction-related sediment within the device must be removed, and any damage to system components repaired. • A minimum of two inspections during the first year of operation to assess the sediment and floatable pollutant accumulation, and to ensure proper functioning of the system. • Inspection frequency in subsequent years is based on the inspection and maintenance plan developed in the first year of operation. Minimum frequency should be once per year. • Inspection is recommended after each major storm event. • Immediately after an upstream oil, fuel or other chemical spill.

3.1.2 – Inspection Tools and Equipment The following equipment and tools are typically required when performing a Jellyfish Filter inspection:

• Access cover lifting tool 3.1.3 – Inspection Procedure • Sediment probe (clear hollow tube with check valve) The following procedure is recommended when performing • Tape measure inspections: • Flashlight • Camera • Provide traffic control measures • Inspection and maintenance log documentation as necessary. • Safety cones and caution tape • Hard hat, safety shoes, safety glasses, and chemical-resistant gloves

87 • Inspect the MAW for floatable pollutants such as trash, debris, and oil sheen. • Measure oil and sediment depth by lowering a sediment probe through the MAW opening until contact is made with the floor of the structure. Retrieve the probe, record sediment depth, and presences of any oil layers and repeat in multiple locations within the MAW opening. Sediment depth of 12 inches or greater indicates maintenance is required. • Inspect cartridge lids. Missing or damaged cartridge lids to be replaced. • Inspect the MAW, cartridge deck, and backwash pool weir for cracks or broken components. If damaged, repair is required. • Dry weather inspections: inspect the cartridge deck for standing water.

• No standing water under normal operating condition. The depth of sediment and oil can be measured • Standing water inside the backwash pool, but not outside the from the surface by using a sediment probe or backwash pool, this condition indicates that the filter cartridges dipstick tube equipped with a ball check valve and need to be rinsed. inserted through the Jellyfish Filter’s maintenance access wall opening. The large opening provides • Standing water outside the backwash pool may indicate a convenient access for inspection and vacuum removal of water and pollutants. backwater condition caused by high water elevation in the receiving water body, or possibly a blockage in downstream infrastructure. • Wet weather inspections: observe the rate and movement of water in the unit. Note the depth of water above deck elevation within the MAW. • Less than 6 inches, flow should be exiting the cartridge lids of each of the draindown cartridges (i.e. cartridges located outside the backwash pool). • Greater than 6 inches, flow should be exiting the cartridge lids of each of the draindown cartridges and each of the hi-flo cartridges (i.e. cartridges located inside the backwash pool), and water should be overflowing the backwash pool weir. • 18 inches or greater and relatively little flow is exiting the cartridge lids and outlet pipe, this condition indicates that the filter cartridges are occluded with sediment and need to be rinsed. 3.2 – Maintenance 3.2.1 – Maintenance Requirements Required maintenance for Jellyfish Filter units is based upon results of the most recent inspection, historical maintenance records, or the site specific water quality management plan; whichever is more frequent. In general, maintenance requires some combination of the following:

• Sediment removal for depths reaching 12 inches or greater, or within 3 years of the most recent sediment cleaning, whichever occurs sooner. • Floatable trash, debris, and oil must be removed. • Filter cartridges rinsed and re-installed as required by the most recent inspection results, or within 12 months of the most recent filter rinsing, whichever occurs first.

88 • Replace filter cartridge if rinsing does not remove accumulated sediment from the tentacles, or if tentacles are damaged or missing. It is recommended that tentacles should remain in service no longer than 5 years before replacement. • Damaged or missing cartridge deck components must be repaired or replaced as indicated by results of the most recent inspection. • The unit must be cleaned out and filter cartridges inspected immediately after an upstream oil, fuel, or chemical spill. Filter cartridge tentacles should be replaced if damaged by the spill.

3.2.2 – Maintenance Tools and Equipment The following equipment and tools are typically required when performing Jellyfish Filter maintenance:

• Vacuum truck • Ladder • Garden hose and low pressure sprayer • Rope or cord to lift filter cartridges from the cartridge deck to the surface • Adjustable pliers for removing filter cartridge tentacles from cartridge head plate • Plastic tub or garbage can for collecting effluent from rinsed filter cartridge tentacles • Access cover lifting tool • Sediment probe (clear hollow tube with check valve) • Tape measure • Flashlight • Camera • Inspection and maintenance log documentation • Safety cones and caution tape • Hard hats, safety shoes, safety glasses, chemical-resistant gloves, and hearing protection for service providers • Proper safety equipment for confined space entry • Replacement filter cartridge tentacles if required

3.2.3 – Maintenance Procedure The following procedures are recommended when maintaining the Jellyfish Filter:

• Provide traffic control measures as necessary. • Open all covers and hatches. Use ventilation equipment as required, according to confined space entry procedures. • Caution: Dropping objects onto the cartridge deck may cause damage. • Perform Inspection Procedure prior to maintenance activity. • To access the cartridge deck for filter cartridge service, descend the ladder and step directly onto the deck. Caution: Do not step onto the maintenance access wall (MAW) or backwash pool weir, as damage may result. Note that the cartridge deck may be slippery.

3.2.4 – Filter Cartridge Rinsing Procedure • Remove a cartridge lid. • Remove the cartridge from the receptacle using the lifting loops in the cartridge head plate. Caution: Should

89 a snag occur, do not force the cartridge upward as damage to the tentacles may result. Rotate the cartridge with a slight sideways motion to clear the snag and continue removing the cartridge.

• Thread a rope or cord through the lifting loops and lift the filter cartridge from the cartridge deck to the top surface outside the structure. • Caution: Immediately replace and secure the lid on the exposed empty receptacle as a safety precaution. Never expose more than one empty cartridge receptacle. • Repeat the filter cartridge removal procedure until all of the cartridges are located at the top surface outside the structure. • Disassemble the tentacles from each filter cartridge by rotating counter-clockwise. Remove the tentacles from the cartridge head plate. • Position a receptacle in a plastic tub or garbage can such that the rinse water is captured. Using a low-pressure garden hose sprayer, direct a wide-angle water spray at a downward 45° angle onto the tentacle membrane, sweeping from top to bottom along the length of the tentacle. Rinse until all sediment is removed from the membrane. Caution: Do not use a high pressure sprayer or focused stream of water on the membrane. Excessive water pressure may damage the membrane. Turn membrane upside down and pour out any residual rinsewater to ensure center of tentacle is clear of any sediment. • Remove rinse water from rinse tub or garbage can using a vacuum hose as needed.

Rinsing of dirty filter cartridge tentacles with a low-pressure garden hose sprayer, and using a plastic garbage container to capture rinse water.

90 • Slip the o-ring over the tentacle nipple and reassemble onto the cartridge head plate; hand- tighten. • If rinsing is ineffective in removing sediment from the tentacles, or if tentacles are damaged, provisions must be made to replace the spent or damaged tentacles with new tentacles. Contact Contech to order replacement tentacles. • Lower a rinsed filter cartridge to the cartridge deck. Remove the cartridge lid on a receptacle and carefully lower the filter cartridge into the receptacle until the head plate gasket is seated squarely on the lip of the receptacle. Caution: Should a snag occur when lowering the cartridge into the receptacle, do not force the cartridge downward; damage may occur. Rotate the cartridge with a slight sideways motion to clear the snag and complete the installation. • Replace the cartridge lid on the exposed receptacle. Rinse away any accumulated grit from the receptacle threads if needed to get a proper fit. Align the cartridge lid male threads with the cartridge receptacle female threads. Firmly twist the cartridge lid clockwise a minimum 110º to seat the filter cartridge snugly in place, with a proper watertight seal. • Repeat cartridge installation until all cartridges are installed.

3.2.5 – Vacuum Cleaning Procedure • Caution: Perform vacuum cleaning of the Jellyfish Filter only after filter cartridges have been removed from the system. Access the lower chamber for vacuum cleaning only through the maintenance access wall (MAW) opening, being careful not to damage the flexible plastic separator skirt that is attached to the underside of the deck. The separator skirt surrounds the filter cartridge zone, and could be torn if contacted by the wand. Do not lower the vacuum wand through a cartridge receptacle, as damage to the receptacle will result. • To remove floatable trash, debris, and oil, lower the vacuum hose into the MAW opening and vacuum floatable pollutants off the surface of the water. Alternatively, floatable solids may be removed by a net or skimmer. • Using a vacuum hose, remove the water from the lower chamber to the sanitary sewer, if permitted by the local regulating authority, or into a separate containment tank. • Remove the sediment from the bottom of the unit through the MAW opening. • For larger diameter Jellyfish Filter manholes (8-ft, 10-ft, 12-ft diameter), complete sediment removal may be facilitated by removing a cartridge lid from an empty receptacle and inserting a jetting wand (not a vacuum wand) through the receptacle. Use the sprayer to rinse loosened sediment toward the vacuum hose in the MAW opening, being careful not to damage the receptacle.. • After the unit is clean, re-fill the lower chamber with water if required by the local jurisdiction, and re-install filter cartridges. • Dispose of sediment, floatable trash and debris, oil, spent tentacles, and water according to local regulatory requirements. 3.2.6 – Chemical Spills • Caution: If a chemical spill has been captured by the Jellyfish Filter, do not attempt maintenance. Immediately contact the local hazard response agency.

A maintenance worker stationed on the surface uses a vacuum hose to evacuate water, sediment, and floatables from the Jellyfish Filter by inserting the vacuum wand through the maintenance access wall opening.

A view of a Jellyfish Filter cartridge deck from the surface showing all the cartridge lids intact and no standing water on the deck (left image), and inspection of the flexible separator skirt from inside the maintenance access wall opening (right image).

92 Assembly of a Jellyfish Filter cartridge (left) and installation of a filter cartridge into a cartridge receptacle in the deck (right).

3.3 – Disposal Procedures Disposal requirements for recovered pollutants and spent filtration tentacles may vary depending on local guidelines. In most areas the sediment and spent filtration tentacles, once dewatered, can be disposed of in a sanitary landfill. It is not anticipated that the sediment would be classified as hazardous waste.

Petroleum-based pollutants captured by the Jellyfish Filter, such as oil and fuels, should be removed and disposed of by a licensed waste management company.

Although the Jellyfish Filter captures virtually all free oil, a sheen may still be present at the MAW. A rainbow or sheen can be visible at oil concentrations of less than 10 mg/L (ppm).

Chapter 4 4 – Recommended Safety Procedures Jobsite safety is a topic and a practice addressed comprehensively by others. The inclusions here are merely reminders to whole areas of Safety Practice that are the responsibility of the Owner(s), Manager(s) and Contractor(s). OSHA and Canadian OSH, and Federal, State/Provincial, and Local Jurisdiction Safety Standards apply.

4.1 – Confined Space/Personal Safety Equipment/Warning and Cautions Please see reference on Page 3.

Chapter 5 5 – Jellyfish Filter Replacement Parts Jellyfish membrane filtration cartridges, cartridge components, cartridge lids, other replacement parts can be ordered by contacting Contech Engineered Solutions at:

Phone: 800-338-1122 Email: [email protected] Website: www.ContechES.com

5.1 – Jellyfish Filter Replacement Parts List Note: Jellyfish Cartridges and/or Filtration tentacles are available in the following lengths:

• 15 Inch (381 mm) • 27 Inch (686 mm) • 40 Inch (1,016 mm) • 54 Inch (1,372 mm) • Jellyfish Cartridge (specify length). Includes head plate with lifting loops, rim gasket, eleven (11) filtration tentacles, eleven (11) o-rings, and eleven (11) locking nuts • Standard Head plate • Blank head plate

93 • Rim gasket (for head plate) • Locking nuts (for tentacles) • O-rings (for tentacles) • Cartridge lids are available with the following orifice sizes: 70mm, 55mm, 45mm, 35mm, 30mm, 25mm, 30mm, blank lid (no orifice) • Maintenance Access Wall (MAW) extension (18-inch segment)

* Nothing in this catalog should be construed as an expressed warranty or implied warranties, including the warranties of merchantability and of fitness for any particular purpose. Jellyfish Filter Inspection and Maintenance Log Owner: ______Jellyfish Model No.:______

Location: ______GPS Coordinates:

______Land Use: Commercial:______Industrial: ______Service

Station:______

Road/Highway:____ Airport: ______Residential: ______Parking Lot:______

Date/Time:

Inspector:

Maintenance Contractor:

Visible Oil Present: (Y/N)

Oil Quantity Removed

Floatable Debris Present: (Y/N)

Floatable Debris removed: (Y/N)

Water Depth in Backwash Pool

Draindown Cartridges externally rinsed and re-commissioned: (Y/N)

94 New tentacles put on Cartridges: (Y/N)

Hi-Flo cartridges externally rinsed and recommissioned (Y/N):

New tentacles put on Hi- Flo Cartridges: (Y/N)

Sediment Depth Measured: (Y/N)

Sediment Depth (inches or mm):

Sediment Removed: (Y/N)

Cartridge Lids intact: (Y/N)

Observed Damage:

Comments:

JFF_OM_10/14

95