RESOLUTION NO. 22-90
Resolution Of The City Council Of The City Of Emeryville Authorizing The City Engineer To Advertise For Public Bidding For The Storm Drain Large Trash Separators Project, EPW 107-18, And To Purchase Any And All Equipment And Materials (CIP #18475009); CEQA Determination: Exempt Pursuant To State CEQA Guidelines 15061(b)(3)
WHEREAS, the Storm Drain Large Trash Separators Project is a Capital Improvement Program project, EPW 107-18, (CIP #18475009), with the purpose of reducing the amount of trash entering creeks and the San Francisco Bay through its storm drain system as part of its Municipal Regional Stormwater Permit (MRP) administered by the San Francisco Bay Regional Water Quality Control Board; and WHEREAS, The target trash reduction amounts in the new MRP 3.0 include a 90% reduction by July 2023 and a 100% reduction, or no visual impact, by July 2025; and WHEREAS, the City of Emeryville has implemented maintenance strategies and installed infrastructure to meet the 80% trash reduction goal for 2019 but additional work is required to meet 2023 and 2025 goals; and
WHEREAS, the Capital Improvement Program adopted by the City Council in June 2016 includes funding for a Large Trash Separator in Storm Drain Line, CIP #18475009; in order to reach the MRP trash reduction amounts; and
WHEREAS,; on September 28, 2018, the City received 3 bids for the project and subsequently entered into a contract with Schaaf and Wheeler Consulting Civil Engineers to perform consulting feasibility studies for implementing Large Trash Separators in Emeryville; and
WHEREAS, State of California Department of Transportation (Caltrans) is also subject to Regional Water Quality Control Board permit requirements for trash capture and has developed a grant program to construct Full Capture Devices (FTC) in cooperation with local agencies; and
WHEREAS, Caltrans and the City of Emeryville staff have identified a project to install a Hydrodynamic Separator (HDS) type FTC on Emery Street that will meet the goals of both agencies (“Project”); and
WHEREAS, on June 15, 2021, the City Council approved a funding agreement with Caltrans for $680,000 to design and construct the Project with a condition that the City construct and maintain the FTC; and
WHEREAS, the City of Emeryville, pursuant to California Streets and Highways Code Sections 114 and 130, will enter into a Cooperative Agreement for improvements to the State Highway System as a watershed stakeholder within the City’s jurisdiction Caltrans’ Cooperative Implementation Agreement (CIA) provides capital and support DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A Resolution No. 22-90
Authorization to Advertise for Trash Separator Project
City Council Meeting | July 5, 2022
funding for planning, design, environmental studies, right of way acquisition (easement only) and construction of stormwater treatment facilities; and WHEREAS, Caltrans will contribute $680,000 to the City of Emeryville to design and construct the Project facilities, creating a total project budget of $1,110,000; and WHEREAS, staff seek approval for the purchase of the equipment and materials, which is estimated at $250,000, for the project in conjunction with public bidding and contracting efforts; and
WHEREAS, total project construction costs for the Emery Street FTC unit are estimated to be $830,000; and
WHEREAS, Caltrans’ funding for the project requires that the City provide final invoices to Caltrans no later than May, 2023; and
WHEREAS, this project was previously determined to be exempt under categorical exemption in State CEQA Guidelines Section 15061(b)(3); and WHEREAS, once the City Engineer has reviewed and approved the plans and specifications for this project and Caltrans approval has been obtained, the project will be ready for Public Bids; now, therefore, be it
RESOLVED, by the City Council of the City of Emeryville that the City Engineer is hereby authorized to advertise said project for Public Bids once the City Engineer has approved the plans and specifications for CIP Project No. 18475009; and be it further RESOLVED, by the City Council of the City of Emeryville that the City Engineer is hereby authorized to purchase any and all necessary equipment and materials for this project at a cost not to exceed $250,000.
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A Resolution No. 22-90
Authorization to Advertise for Trash Separator Project
City Council Meeting | July 5, 2022
ADOPTED, by the City Council of the City of Emeryville at a regular meeting held Tuesday, July 5, 2022, by the following vote:
AYES: 5
Mayor Bauters, Vice Mayor Medina and Council Members Donahue, Martinez and Welch
NOES: 0
ABSTAIN: 0
ABSENT: 0
MAYOR
ATTEST: APPROVED AS TO FORM:
CITY CLERK CITY ATTORNEY
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A Current Condition Category
(Hash Color = Current Category)
")
")
")
")
")
")
")
")
") ")
")
")
")
")
")
")
")
") ")
")
") ")
")
")
")
")
")
")
")
")
")
")
")
") ")
")
")
")
")
") ")
")
")
")
")
") ") ")
kj!
Stanford Av
Adeline St
Shellmound St
San Pablo Av
W Macarthur Bl
Market St
Alcatraz Av
40Th St
Hollis St
Ashby Av
Powell St
Mandela Pw
emery1
37Th St
Helen St
Hollis St
Linden St
65Th St
Peabody La
34Th St
Acton St
Boyer St
53Rd St
44Th St
Ocean Av
64Th St
62Nd St
Peladeau St
59Th St
Frontage Rd
Horton St
Idaho St
61St St
Baker St
Vallejo St
36Th St
Beach St
Louise St
46Th St
Magnolia St
Fremont St
42Nd St
41St St
63Rd St
43Rd St
Los Angeles St
Mabel St
35Th St
Hubbard St
39Th St
Yerba Buena Av
Lowell St
Marshall St
Alcatraz Av
California St
Halleck St
Gaskill St
Doyle St
Harlan St
Park Av
7Th St
Harmon St
Ohlone Wy
54Th St
Helen Ct
Anchor Dr
Beaudry St
Haven St
Fairview St
60Th St
Stanford Av
Haruff St
Herzog St
66Th St
Ettie St
45Th St
Overland Av
Hannah St
Sherwin St
55Th St
Doyle
Admiral Dr
56Th St
Chestnut St
Aileen St
Shellmound Wy
Folger Av
57Th St
Arlington Av
Watts St
Holden St
Emery St
Boise St
61St Pl
Grace Av
Salem St
Essex St
Potter St
Wood St
67Th St
Apgar St
Peralta St
Christie Av
Emery Bay Dr
tS latnediccO
48Th St
Lowell
47Th St
Bay St
Te mescal Ci
Lacoste St
?
@13 ?
@123
1 2
3 4
5 §¨¦880
§¨¦580
§¨¦80
Sources: Esri, DeLorme, NAVTEQ, TomTom, Intermap, increment P Corp., GEBCO, USGS, FAO, NPS, NRCAN, GeoBase, IGN, Kadaster NL, Ordnance Survey, Esri Japan, METI, Esri China (Hong Kong), swisstopo, and the GIS User Community
City of Emeryville Full Trash Capture and Trash Management Area Map Proposed Full Trash Capture
Non-Jurisdictional
(Dot color = Generation Category)
Trash Generation
Category
Legend
") Full-Capture Location
Creek/Shoreline Hotspot
Low Full Trash Capture
Moderate
High
Very High
kj!
±
0 0.1 0.2 0.4
Miles
Data Sources:
Roads: Alameda County
City Boundaries: Alameda County
Creeks: Alameda County
Parcels: Alameda County
Background: ESRI World Topographic Map
Map Created By:
EOA, Inc.
Date:
August 31st, 2016
Trash Management Area
Streets
Creeks
Parcel Boundary
Freeway
Baseline Conditions Map Updated August 2016 (trash capture added post-2009) Exhibit A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A Ü 1,200 600 0 1,200 Feet
HDS Unit Site - Emeryville
Date: 11/27/2018 Coordinate System: NAD 1983 StatePlane California III FIPS 0403 Feet Projection: Lambert Conformal ConicNorth American 1983
Legend
City Limits
Approximate HDS Site
Catch Basins
Stormdrain Main
Flow Direction
HDS Catchment (88 acres)
Flow Direction
Exhibit B
Approximate Location of HDS System and Treatment Area
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 3EAA1A51-81C5-4E52-B3BF-DC1783840FA8 City of Emeryville
CIA No. D43CIAEME00O1
COOPERATIVE IMPLEMENTATION AGREEMENT
THIS AGREEMENT, ENTERED INTO EFFECTIVE ON _June 18, 2021, (the EFFECTIVE DA TE) is between the State of California acting by and through its Department of Transportation, referred to herein as CAL TRANS and the City of Emeryville, a body politic and a municipal corporation (chartered City) of the State of California, referred to herein as AGENCY. CALTRANS and AGENCY are together referred to as PARTIES.
RECITALS
1. CALTRANS and AGENCY, pursuant to California Streets and Highways Code (SHC) Sections 114 and 130, are authorized to enter into a Cooperative Agreement for improvements to the State Highway System (SHS) as a watershed stakeholder within AGENCY's jurisdiction.
2. As per Attachment IV of the Caltrans National Pollutant Discharge Elimination Pennit Order 2012-0011-DWQ (NPDES Permit), Section I.A, CALTRANS and AGENCY may collaboratively implement the NPDES Permit requirements as they have been identified as stakeholders in the Total Maximum Daily Load (TMDL) or contain Significant Trash Generating Areas (STGA) for the areas draining to the vicinity of Emery Sh·eet and MacArthur Boulevard (hereinafter referred to as "PROJECT"). CAL TRANS has agreed to contribute an amount hot to exceed Six Hundred Eighty Thousand Dollars ($680,000) to AGENCY for AGENCY to construct the PROJECT, within the regional area under the jurisdiction of AGENCY to comply with the TMDL or to treat STGAs. The NPDES Pe1mit (including Attachment IV) is located at:
www. waterboards. ca. gov /water issues/programs/ storm water/ cal trans.html
3. AGENCY has agreed to implement the PROJECT subject to the terms and conditions of this Agreement including all documents attached hereto that are incorporated herein and hereby made a part of this Agreement (collectively referred to as the AGREEMENT).
4. AGENCY will be responsible for all management, maintenance and operations, including costs of the constructed PROJECT.
5. The SWRCB will credit CAL TRANS with one (1) Compliance Unit (CU) for each EightyEight Thousand Dollars ($88,000) paid to AGENCY. A compliance unit is defined as one (1) acre ofCALTRANS' Right-of-Way (ROW) from which the runoff is retained, treated, and/or otherwise controlled prior to discharge to the relevant reach. The financial equivalent as submitted by CAL TRANS is One Hundred Seventy-Six Thousand Dollars ($176,000) per CU. The SWRCB is encouraging collaborative efforts and Cooperative Implementation Agreements to reduce pollutants in TMDL and STGA watersheds and uses a 50% discount for CU in dollars contributed to the Cooperative Implementation. This sets the CU equivalent at Eighty-Eight Thousand Dollars ($88,000).
6. For NPDES Permit compliance, CAL TRANS will claim a percentage of PROJECT pollutant waste load reductions granted by the San Francisco Regional Water Quality Control Board for the PROJECT equal to the percentage of total PROJECT cost contributed by CAL TRANS or the waste load allocation assigned to CAL TRANS for the PROJECT watershed, whichever is less. CAL TRANS intends to use the PROJECT waste DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A 06-18-2021
06/18/21
for
06/18/21
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A 1 Mary Grace Houlihan
From: Yan, Qi@Waterboards <[email protected]>
Sent: Wednesday, June 9, 2021 4:46 PM
To: Nancy Humphrey
Cc: Mary Grace Houlihan; 'Caitlin Gilmore'; Beauduy, Derek@Waterboards; Johansson, Kenneth H@DOT
Subject: Re: [External] RE: [External] Caltrans CIA for HDS Unit Comments ***Emery Site approved**
Hello Nancy,
Thank you for submitting the proposal. We can give conceptual project approval based on the project information you provided. Please note that our approval of this cooperative project with Caltrans is conditioned on submittal of the following information by the City and/or Caltrans once project planning and design is finalized, and prior to construction:
• Map(s) delineating the area draining to the trash capture devices. Maps should identify the areas and trash generation rating of Caltrans and City ROW to be controlled for trash by the device. • GIS mapping and/or as-built plans showing the storm drain system draining to the trash capture device.
Storm drain information should correspond with the drainage area maps. • Breakdown of Caltrans and City ROW acres controlled by the devices and the trash generation rating of those areas.
• Final design plans and calculations.
• Confirmation that the device meets the requirements of MRP Provision C.10 and is on the State Board list of approved trash capture devices.
• Final project agreements between Caltrans and the City. These should include identification of the party responsible for ongoing operation and maintenance of the device once installed. If operation/maintenance responsibilities are not described in the final agreements, provide this information in a separate document.
Thank you for identifying this opportunity to reduce trash discharges through the MS4 and working cooperatively with Caltrans to implement the project. This email serves as our conceptual approval of the project. Please contact me if you have questions or if any changes to the project occur that would impact acres of City or Caltrans property controlled for trash with the proposed device.
Thanks,
Qi Yan, PhD
Water Resource Control Engineer
San Francisco Bay Regional Water Quality Control Board
mobile 510-622-2499 | [email protected]
From: Nancy Humphrey <[email protected]>
Sent: Wednesday, June 9, 2021 1:08 PM
To: Yan, Qi@Waterboards <[email protected]>; Beauduy, Derek@Waterboards <[email protected]>
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A Attachment II
City of Emeryville
Proposed Trash Capture Facility Project
Project Summary:
CIP No. Total Estimated
Capital Cost
$680,000
Project Manager Nancy Humphrey Estimated Start Date 8/1/2021 Department/Division Public Works Estimated Completion
Date
5/1/2023
Department Priority High Project Status Pending funding Project Name Full Trash Capture at MacArthur Boulevard and Emery Street Project Description
and Scope
A debris separating baffle box (DSBB) will be constructed at MacArthur Boulevard west of Emery Street in the City of Emeryville. Approximately 81 acres of land will be treated by this system, of which 3.8 acres are from Caltrans Right of Way and 34 acres below to the City of Oakland. This device will screen, separate and trap debris, sediment, and oil and grease from stormwater runoff. This project will provide a watershed based solution to reduce pollutant loadings, trash, and sediments from entering the San Francisco Bay, thus enhancing water quality for beneficial and recreational uses.
Performance Measures:
Installation of Debris Separating Baffle Box Unit at MacArthur Boulevard.
Preliminary Project Schedule:
These dates are subject to refinement as the Project is developed:
Design Kickoff 8/1/2021
Site Investigations 8/1/2021 - 10/1/2021
Construction Drawings (70%) (including
procuring of necessary permits) 10/1/2021 - 12/1/2021
Construction Drawings (100%) 12/1/2021 - 1/1/2022
Bid Package 1/1/20222 - 2/1/2022
Advertise for Bids 2/1/2022
Award Construction Contract 3/1/2022
Construction 4/1/2022 – 6/1/2022
Deadline to Bill Caltrans for FY 5/1/2023
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A
Preliminary Encumbrance Schedule by Fiscal Year:
FY 21/22 $70,000
FY 22/23 $610,000
Trash Capture:
The City proposes to complete the design and installation of one Full Trash Capture Device (FTCD), BioClean Debris Separating Baffle Box (DSBB) or equivalent Old Castle Nutrient Separating Baffle Box (NSBB) (Figure 1). The DSBB unit will intercept litter from approximately 81 acres of old urban and old industrial land uses (Figure 2), to mitigate water quality impacts in the Watershed. Of these 81 acres, 34 acres are in the City of Oakland, 14.7 acres are designated as low trash generating areas, 5.9 acres are designated as moderate trash generating areas, 15 acres are designated as high trash generating areas and 11.6 acres are designated as very high trash generating areas. The treatment area includes 3.8 acres of CALTRANS right of way. The DSBB units have the capability of separating and trapping debris of 5mm or larger, along with sediment, and oil and grease in stormwater and urban runoffs.
PCB / Mercury Removal:
The proposed DSBB unit for this project is certified by the California State Water Resources has been rated as being effective at trapping 80% of sediments at the 125-micron level. The loads reduced accounting methodology for FTCDs is the product of tributary area treated by large full trash capture device in acres, area weighted PCBs or mercury yield (mg/acre-year) and efficiency factor for FTCDs, which is assumed to be 20%. The PCB load generation rate of the watershed is 7.1 grams per year resulting in a load reduction of 1.4 grams per year. Mercury will have a similar 20% reduction.
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A DSBB Separator
A Stormwater Separation Solution
OPERATION & MAINTENANCE
MANUAL
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A 1 | Page
OPERATION & MAINTENANCE
The DSBB Separator, a stormwater dual‐stage Hydrodynamic Separator is designed to remove high levels of trash, debris, sediments and hydrocarbons (optional). The innovative screening system directs floatable trash, debris, and organics into raised filtration screens for dry state storage which prevents septic conditions, odor, nutrient leaching and allows for easy removal. The raised filtration screens are assisted by a non‐clogging inlet splitting screen which directs flows to the filtration screens while maintaining high treatment flow rates. The DSBB is able to effectively capture and store sediment with no maintenance or loss of treatment capacity for several years based on annual average loading in most regions.
Yet, as with all stormwater BMPs, inspection and maintenance on the DSBB Separator is necessary.
Stormwater regulations require that all BMPs be inspected and maintained to ensure they are operating as designed to allow for effective pollutant removal and provide protection to receiving water bodies. It is recommended that inspections be performed multiple times during the first year to assess site‐specific loading conditions. This is recommended because pollutant loading can vary greatly from site to site. Variables such as nearby soil erosion or construction sites, winter sanding of roads, amount of daily traffic and land use can increase pollutant loading on the system.
The first year of inspections can be used to set inspection and maintenance intervals for subsequent years. Without appropriate maintenance a BMP can exceed its storage capacity which can negatively affect its continued performance in removing and retaining captured pollutants.
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A 2 | Page
System Diagram:
Inspection Equipment
Following is a list of equipment to allow for simple and effective inspection of the DSBB Separator:
Bio Clean Environmental Inspection Form (contained within this manual). Flashlight.
Manhole hook or appropriate tools to remove access hatches and covers. Appropriate traffic control signage and procedures.
Measuring pole and/or tape measure.
Protective clothing and eye protection.
Note: entering a confined space requires appropriate safety and certification. It is generally not required for routine inspections or maintenance of the system.
Inspection Steps
The core to any successful stormwater BMP maintenance program is routine inspections. The inspection steps required on the DSBB are quick and easy. As mentioned above the first year should be seen as the maintenance interval establishment phase. During the first year more frequent inspections should occur in order to gather loading data and maintenance requirements for that specific site. This information can be used to establish a base for long‐term inspection and maintenance interval requirements.
The DSBB Separator can be inspected though visual observation without entry into the system. All necessary pre‐inspection steps must be carried out before inspection occurs, especially traffic control and other safety measures to protect the inspector and nearby pedestrians from any dangers associated with an open access hatch or manhole. Once these access covers have been safely opened the inspection process can proceed:
Prepare the inspection form by writing in the necessary information including project name, location, date & time, unit number and other info (see inspection form). Observe the inside of the system through the access hatches. If minimal light is available and vision into the unit is impaired utilize a flashlight to see inside the system. Look for any out of the ordinary obstructions in the inflow pipe, sediment chambers, filtration screens, splitter screen, or outflow pipe. Write down any observations on the inspection form.
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A 3 | Page
Through observation and/or digital photographs estimate the amount of floatable debris accumulated inside the filtration screens. Record this information on the inspection form.
Check both the right and left filtration screens if applicable. Utilizing a tape measure or measuring stick estimate the amount of sediment accumulated in each of the three sediment chambers. Record this depth on the inspection form. Observe the condition and color of the hydrocarbon booms and any floating oils in front of the boom cage. Record this information on the inspection form. Finalize inspection report for analysis by the maintenance manager to determine if maintenance is required.
Maintenance Indicators
Based upon observations made during inspection, maintenance of the system may be required based on the following indicators:
Missing or damaged internal components.
Obstructions in the system or its inlet or outlet.
Excessive accumulation of floatable trash, debris and foliage in the filtration screens in which the length and width of the chambers screens is more than half full and/or flow into the screens is fully impeded by these debris. Large items blocking the entrance. Excessive accumulation of sediment in any of the three separation chambers is more than half‐full (18” to 27” depending on the model size). See chart below:
ID
Length
(in)
ID
Width
(in)
Sediment
Chamber
Depth (in)
Sediment
Chamber
Capacity at 50%
Full (cu ft)
Screen
Basket
Quantity
Screen
Basket
Width (in)
Screen
Basket
Height (in)
Screen
Basket
Capacity
(cu ft)
Cage
Height
(in)
Cage
Width
(in)
Booms
2.5‐4 48 30 36 14.8 2 9 12 3.3 9 5 1
3‐6 72 36 36 26.8 2 11 18 9.0 15 7 1
4‐6 72 48 36 35.8 2 15 18 12.3 15 11 1
4‐8 96 48 36 47.8 2 15 24 22.0 21 11 2
5‐10 120 60 36 70.0 2 19 24 34.0 21 15 2
6‐12 144 72 36 102.0 2 22 24 47.4 21 21 2
8‐12 144 96 36 136.0 2 30 27 72.7 24 29 2
8‐14 168 96 36 160.0 2 30 27 84.4 24 29 2
10‐14 168 120 36 200.0 2 38 27 106.9 24 37 2
11‐16 192 132 45 309.4 2 40 33 160.4 30 45 3
11‐24 288 132 54 569.3 2 40 36 263.3 33 45 3
11‐34 408 132 54 816.8 2 40 36 373.3 33 45 3
Sediment Chamber Hydrocarbon Boom Cage
Model
Screen Basket Dimensions
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A 4 | Page
Maintenance Equipment
It is recommended that a vacuum truck be utilized to minimize the time required to maintain the DSBB Separator:
Bio Clean Environmental Maintenance Form (contained in O&M Manual). Flashlight.
Manhole hook or appropriate tools to access hatches and covers. Appropriate traffic control signage and procedures.
Protective clothing and eye protection.
Note: entering a confined space requires appropriate safety and certification. It is generally not required for routine maintenance of the system. Exception is deeper units entry may be required to open filtration screen lids and replace hydrocarbon booms (optional). Vacuum truck (with pressure washer attachment preferred).
Maintenance Procedures
It is recommended that maintenance occurs at least three days after the most recent rain event to allow for drain down from any associated upstream detention systems. Maintaining the system while flows are still entering it will increase the time and complexity required for maintenance.
Debris captured in the filtration screens requires time to dry out which decreases time to remove and associated weight. Cleaning of the filtration screens and sediment chambers can be performed from finish surface without entry into the vault utilizing a vacuum truck on most installations. Depth and configuration of the installation may create conditions which would require entry for some or all of the maintenance procedures. Configuration and size of access hatches also effects the conditions in which entry may be required. Once all safety measures have been set up cleaning of the filtration screens, hydrocarbon boom(s) (optional) and/or sediment chambers can proceed as followed:
Remove all access hatches (requires traffic control and safety measures to be completed prior).
Locate the right and left filtration screens. Manhole or hatch access will be provided to each of these screens. As highlighted below. Depending on the configuration of the DSBB the filtration screens may or may not have sliding lids depending on factors such as online or offline bypass, water level at peak flow, back flow conditions amongst other site‐specific variables. Units that have lids are designed with locking mechanisms along the sidewall of the structure that can be unlocked from the finished surface with an extension rod. The length of this rod is limited and for deeper installs entry may be required to unlock and slide the lids.
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A 5 | Page
Once filtration screens lids are opened (if applicable) the vacuum hose extension is inserted down into the screens for removal of debris. The width of the screen of the smallest model is 9” therefore allowing an standard 8” vacuum hose to be used for all models and sizes. All debris should be removed with the vacuum hose and the pressure washer should be used to spray down and remove all debris on the bottom, side and top screens. Ensure all holes Top view into DSBB. Filtration
screens highlighted in yellow without sliding lids.
Top view into DSBB. Filtration
screens highlighted in turquoise with sliding lids.
Isometric view into the DSBB illustrating the sliding lids of the filtration screens. Lids can slide left and right in the horizontal direction from closed and locked position for easy access for cleaning and removal of debris.
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A 6 | Page
within in the screen are cleared of debris. This is critical to restoring the full hydraulic capacity of the filtration screens. Once completed close and lock lids (if applicable). Using an extension on a vacuum truck position the hose over the opened access hatch or hatches leading to the first sediment chamber adjacent to the pipe inlet and includes the splitter screen. Lower vacuum hose into the sediment chamber on the left and right side of the splitter screen. This is where a majority of the larger sediments and heavy debris will accumulate. Remove all floating debris, standing water and sediment from this sediment chamber. Vertical access to the bottom of the sediment chamber is unimpeded. The vac hose can be moved from side‐to‐side to fully remove sediments at the corners. A power washer can be used to assist if sediments have become hardened and stuck to the walls or the floor of the chamber. The power washer should also be used to spray the splitter screen clean of any accumulated debris. The vacuum hose can also be inserted on the outlet side of the splitter screen (inside the V) to remove any remaining accumulated sediment.
First Chamber Second Chamber Third Chamber
Top view into DSBB illustrating the three sediment chambers. The yellow highlighted areas show where the vacuum hose should be inserted for cleaning of the first sediment chamber.
The turquoise highlighted area show where the vacuum hose should be inserted for cleaning of the second sediment chamber.
The orange highlighted areas shows where the vacuum
hose is inserted for cleaning of the third sediment
chamber.
Left Side
Right Side
Inside V
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A 7 | Page
Repeat the same procedure in the second and third sediment chambers in the locations shown in the above diagrams. Access to these two chambers is in the center of the system unlike the first sediment chamber. The filtration screens cover the sediment chamber along the sides, yet allow for unimpeded access in the middle without a requirement to open the filtration chamber tops or go through the filtration screens (hinged floor) as found with other baffle box systems. Hatch or manhole size, quantity and location vary based on model size and site specific project constraints. Various access hatch sizes and configurations are available to meet individual project requirements. Larger hatches, open assisted hatches and/or taller ID dimensions to increase headroom are available by request. Below are a few examples of various models and optimal hatch configurations.
A DSBB‐2.5‐4 is offered with a 2.5‐4 access hatch in
either parkway, direct or indirect traffic rating. This provides full access. Bolt and pull, hinged or hinged with lift‐assisted options offered. Figures not to scale.
A DSBB‐5‐10 is offered with two 2.5‐4 access
hatches in either parkway, direct or indirect
traffic rating along with a single 24” diameter
manhole for access to the third sediment
chamber and hydrocarbon booms. Bolt and pull, hinged or hinged with lift assisted options offered. Figures not to scale.
A DSBB‐8‐12 is offered with two 3‐6 access
hatches in either parkway, direct or indirect
traffic rating along with a single 30” diameter
manhole for access to the third sediment
chamber and hydrocarbon booms. Bolt and pull, hinged or hinged with lift‐assisted options offered. Figures not to scale.
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A 8 | Page
Based on the color of the hydrocarbon booms replacement may be necessary. The booms are housed inside the boom cage which is attached to the influent side of the oil skimmer wall. The cage has a hinged top which is opened allowing access to the hydrocarbon booms.
Once old booms are removed new booms can be dropped in and the top closed. See below image.
Follow is a replacement indication color chart for the hydrocarbon booms:
NOTE: Filtration screens can be cleaned before or after cleaning and removal of sediment for the sediment chambers. Cleaning them before is preferred before removing sediment and standing water from the second and third chamber as debris and water will be deposited on the sediment chamber floors in the process of cleaning the filtration screens over the second and third chamber. Cleaning the first sediment chamber before the filtration screens allows the splitter screen to be fully exposed. Thus the pressure washing of all screens (splitter and filtration) can be done as the same time if needed. The last step is to close up and replace all access hatches and remove all traffic control. All removed debris and pollutants shall be disposed of following local and state requirements.
Excellent
Condition
Good Condition
Minimal Capacity
Replacement
Required
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A 9 | Page
Disposal requirements for recovered pollutants may vary depending on local guidelines. In most areas the sediment, once dewatered, can be disposed of in a sanitary landfill. It is not anticipated that the sediment would be classified as hazardous waste. In the case of damaged components, replacement parts can be ordered from the manufacturer. Hydrocarbon booms can also be ordered directly from the manufacturer.
Maintenance Sequence
Remove access hatches set up vacuum truck to clean the filtration screens and sediment chamber. Locate positions of filtration screens and first, second and third sediment chambers plus the hydrocarbon boom cage.
Unlock and open filtration screen lids (if
applicable, some units will not have lids).
Insert vacuum hose into the first filtration
screen and clean out trash & debris. Use a
pressure washer to remove any debris stuck on the screens.
Repeat the above steps for cleaning the
second sediment chamber. Compacted sediment can be loosened using a pressure washer.
Insert vacuum hose in the first sediment
chamber to remove sediment and debris. The
vacuum hose will need to be inserted on the
right and left side of the splitter screen to
remove all sediment. Once completed use a
pressure washer to clean off the splitter screen.
DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A 10 | Page
For Maintenance Services or Information Please Contact Us At:
760‐433‐7640
Or Email: [email protected]
Once cleaning and maintenance is complete
ensure boom cage lid and filtration screen lids are closed and locked. Replace all manhole covers and or access hatches and remove traffic control.
Repeat the above steps for cleaning the
third sediment chamber. Compacted
sediment can be loosened using a pressure washer.
Once the unit is fully cleaned check the
condition of the hydrocarbon booms in the
boom cage hanging on the oil skimmer wall.
Use color indicator in this manual to decide
if replacement is required. If required open boom cage and replace booms. 5796 Armada Drive #250, Carlsbad, CA | 855.566.3938 | [email protected] | www.biocleanenvironmental.com DocuSign Envelope ID: 6BD74661-3DAC-43DA-82E9-F37AF7482A8A