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DEPARTMENT OF ENVIRONMENTAL QUALITY State Revolving Loan Fund (SRF)

Environmental Assessment Monroe County Drain Commission, Monroe County

February 2018

PROJECT IDENTIFICATION

Applicant: Monroe County Drain Commission Monroe County

Authorized Representative: Mr. David Thompson, Drain Commissioner

Address: 1005 South Raisinville Road

Monroe, Michigan 48161

Project Numbers: 5652-01 and 5662-01

PROJECT SUMMARY The Monroe County Drain Commissioner, on behalf of Bedford Township, has applied for an SRF loan for numerous wastewater treatment plant (WWTP) improvements, and sewer and manhole rehabilitation. The total project costs are estimated to be $11,150,000. The WWTP improvements, pump station improvements, and a portion of the sewer rehabilitation will be constructed in summer of 2018. The remaining sewer and manhole rehabilitation will be constructed in 2019. The cost to the typical residential user is expected to increase from $123.75 to $168.16 per quarter for the total project.

PROJECT BACKGROUND

Bedford Township is located in the southwest corner of Monroe County on the Ohio-Michigan border. The south portion of the township is predominately residential. Agriculture land use comprises 22 percent of the land use and is predominately in the north part of the township. According to the Southeast Michigan Council of Governments, the population of Bedford Township is expected to increase slightly during the 20-year planning period. The population according to the 2010 census was 31,085. The projected population in 2030 is estimated to be 34,800.

The Monroe County Drain Commission operates and maintains the Bedford Township wastewater collection and treatment system. The treatment plant is located in the southwestern corner of the township at 335 LaVoy Road, Erie, Michigan. The WWTP was constructed in 1971 and consisted of two aeration tanks, an aerobic digestion tank, two final clarifiers with a surge tank for high flows, a chlorine contact tank, and six sludge drying beds. The first expansion in 1978 added a primary clarifier tank, an additional raw influent pump and barminutor, a blower, three pressure filtration tanks, six aeration tanks, final clarifier tanks, and a new digestor control building and digestor tanks. The second expansion in 1994 added primary clarifier tanks, aeration tanks and a pressure filter, two larger final clarifier tanks, and increased the size of the existing chlorine contact tanks. In 2011, a new Headworks Building was constructed that contained two influent channels, a manual bar screen, an automatic fine screen, five raw influent pumps, and a grit removal system. The WWTP is designed to treat an average daily

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flow of 3.0 million gallons per day (MGD) and can accept a maximum daily flow of 13.2 MGD. The WWTP discharges into Indian Creek in accordance with its National Pollution Discharge Elimination System permit. A number of components at the WWTP are nearing the end of their useful lives while other components need upgrading. A summary of the WWTP issues are as follows:

• Four out of the five existing pressure filters have had multiple failures with one of those permanently out of service. The remaining filters do not have enough capacity during high flows and must be bypassed to prevent backups. This has resulted in exceedance of the Carbonaceous Biochemical Oxygen Demand permit limit. In addition, the pumps and meters are problematic.

• The automatic fine screen removes too many of the organics that are needed in plant processes, which negatively impacts those processes.

• The anaerobic digester’s boilers and heat exchange units are original and have out lived their useful lives. Pumps on Digester Two are not powerful enough to empty the tank and leaves five feet of sludge in the tank.

• Service water system pumps are at the end of their useful lives. • Three automatic samplers have outlived their useful lives. • The Administration Building is too small to house current staff and provide

adequate space for the work processes. In addition, the heating, ventilation, and air conditioning (HVAC) system is past its useful life and is not functioning correctly.

• The Administration Building roof and the Blower Building roof need replacement. The blower intakes located on the roof of the Blower Building are very loud and have generated noise complaints from neighbors.

• The final effluent flow meter is inaccurate and will need to be replaced. • The plant has areas of corroded piping, crumbling concrete, and components

that are out of service. • Sludge disposal is becoming problematic, as land application sites are harder to

find. • Chlorine gas is used for disinfection in conjunction with sodium bisulfite for

dichlorination. The use of these chemicals poses a health and safety hazard.

The collection system is comprised of approximately 130 miles of gravity sanitary sewers that extends 5.5 miles north to Samaria and 6 miles west to Lambertville. The WWTP experiences peak flows above the design flow, which strains many of the plant processes and threatens water quality. An inflow/infiltration (I/I) study was conducted in 2012 to determine which areas of the collection system experienced excessive I/I. Infiltration is groundwater that enters the system through cracks, defects, and/or breaks in the sewer or manholes. Inflow is water that enters the system through connected foundation/footing drains. Several pipe joint defects were identified that allow groundwater to enter the sewer system. Sewer televising and manhole inspections were completed as part of a Stormwater, Asset Management, and Wastewater (SAW) grant received from the Michigan Department of Environmental Quality (DEQ) to examine the structural integrity of the system. The sewers were cleaned, televised, and evaluated for structural integrity using the National Association of Sanitary Sewer Companies (NASSCO) Pipeline Assessment and Certification Program (PACP) rating system. Manholes were evaluated using the NASSCO’s Manhole Assessment and Certification

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Program (MACP) rating system. Areas of structural sewer and manhole defects were identified.

There are six pump stations in the collection system. The pump stations are located at Smith and Lewis Road, Smith and Douglas Road, Monroe Road north of Clegg Road, Crystal Waters located on Douglas Road north of Stearns Road, Country Club Villas located on Smith Road west of Douglas Road, and Legacy located north of Temperance Road. The Smith and Lewis, Smith and Douglas, and Monroe Road Pump Stations were constructed in the 1970s and have outlived their useful lives. They are a wet well/dry well configuration, so the controls are below ground, which creates safety issues. The Country Club Villas, Crystal Waters, and Legacy Pump Stations were constructed in the 1990s, and are equipped with submersible pumps and above-ground controls.

ALTERNATIVES CONSIDERED

The no-action alternative is not viable because the Bedford WWTP will continue to deteriorate. Bedford Township is located nine miles from other WWTPs, so the regional alternative is also not viable.

The alternatives that were considered include upgrading to new technology and optimize the current technologies. The new technologies alternative consists of changing the tertiary treatment to compressible media filters, upgrading the four samplers to flow-paced automatic samplers, installing a brush weir cleaning system on the clarifier troughs, replacing the service water system with a system that utilizes the plant’s effluent, replacing the chlorine disinfection with ultraviolet (UV) disinfection, lowering the floor of the Sludge Storage Tank Building to enable the entire tank to be emptied, installing a screw-press sludge dewatering system, and replacing the final flow meter with a Parshall Flume.

Optimizing the current technologies alternative includes replacing the filters with new pressure filters, installing pumped samplers, replacing the Blower Building roof with an ethylene propylene diene terpolymer membrane, installing a spray wash secondary clarifier cleaning system, replacing the service water equipment and continuing use of potable water, upgrading the chlorine disinfection system, moving the sludge storage tank up to the same level as the pumps, installing a belt press sludge dewatering system, replacing the final flow meter with another v-notch weir, and applying sound attenuation to the Blower Building. Both alternatives include repairing the sewers and manholes with PACP and MACP Grade 4 or Grade 5 structural defects, or that are the source of excessive I/I, and reconfiguring the Smith and Lewis, Smith and Douglas, and Monroe Road Pump Stations.

According to the present worth analysis presented in Table 1, the upgrade to new technologies alternative is the cost-effective option to address the deficiencies at the WWTP and in the collection system.

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Table 1 – Present Worth Analysis Upgrade New

Technologies Optimize Current Technologies

Capital Cost $11,150,000 $34,374,500 Present Worth of Annual Operation, Maintenance, and Replacement Costs

$43,845,618 $42,667,921

Salvage Value $3,485,618 $16,024,048 Net Present Worth $51,509,522 $61,018,372

Selected Alternative

The selective alternative to address the deficiencies at the Bedford Township WWTP is to upgrade to new technologies. The alternative includes the replacement of the failing filters with seven compressed media filters, the addition of a secondary clarifier weir and trough cleaning system, the installation of a washer/compactor in the Headworks Building to remove the organisms needed in the treatment process, replacement of the over-sized boilers and heat exchanger used for digester heating with methane-powered equipment, replacement of the existing disinfection process with UV disinfection equipment, installation of a water system that uses final effluent in the WWTP treatment process to replace the municipal water system, the expansion/remodel of the Administration Building, Administration/Blower Building roof replacement, installation of a Parshall Flume to replace the final flow meter, installation of a screw press for redundant sludge disposal, noise attenuation for the blowers in the Blower Building, installation of a gate in the influent channels, updating the HVAC, reconfiguration of three pump stations, repair of structurally deficient sewer and manholes, and the removal of excessive I/I. In addition, various unutilized piping and components will be removed or abandoned. Figure 1 shows the Bedford WWTP with the improvements. Figures 2 and 3 show the locations of the sewer and manhole rehabilitation.

Project Cost and Construction Schedule

Total project costs are estimated to be $11,150,000, including construction, contingencies, administrative, and legal services. It is anticipated that the project will be funded through the SRF program, administered by the DEQ and the Michigan Finance Authority. The repayment period is 20 years at the current interest rate of 2 percent.

Construction of the first phase of the project is expected to begin in the summer of 2018. The second phase is expected to begin in the summer of 2019. All construction is expected to be complete by the summer of 2020.

ENVIRONMENTAL IMPACTS OF THE PROPOSED PROJECT

Primary Impacts

The proposed project will address many operational issues at the Bedford Township WWTP, leading to improved water quality. There will also be a reduction in the WWTP’s energy and water usage. Safety hazards related to the use of gaseous chlorine will be

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eliminated, as will the production of chlorine by-products such as triholmethanes and haloaetic acids.

Construction will occur at the three pump stations, the WWTP, and scattered areas in the collection system. Impacts of the construction activities associated with this project are considered short-term disruptions that, for the most part, do not extend beyond the period of construction. Short-term adverse impacts associated with construction include noise, dust, removal of ground cover, and increased erosion potential.

Asbestos is expected at the WWTP due to its age. An asbestos management program has been developed and will be followed during construction to prevent exposure to asbestos.

Construction may cause brief inconveniences to those who live and travel though the construction areas. Noise and dust generated by construction activities will temporarily impact area residents. Traffic patterns will be temporarily disrupted during construction. Traffic control procedures will be used; as construction is completed in an area, it will be cleaned up and reopened to traffic. Disturbed areas will be restored as soon as possible. Construction provisions will be enforced for compliance to Part 91, Soil Erosion and Sedimentation Control, of the Natural Resources and Environment Protection Act, 1994 PA 451, as amended, to prevent damage to the surrounding areas from soil erosion, dust, and sedimentation.

A portion of the WWTP is located in the 100-year floodplain. An application for a floodplain permit has been filed. All permit requirements will be followed to minimize adverse impacts to the floodplain. The United States Fish and Wildlife Service and the Michigan Natural Features Inventory have reviewed the proposed project. Both agencies have determined that no endangered or threatened species habitat will be affected by the project. All anticipated impacts to flora and fauna resulting from construction are expected to be temporary. The proposed project will not impact wetlands.

The State Historic Preservation Office has reviewed the proposed project for impacts on historical and archeological resources. It has been determined that there will be no impact on historical or archeological resources from the proposed project.

Fourteen federally recognized tribes were contacted to review the proposed project for impacts to tribal historic, religious, and archeological resources. One response was received that indicated the project, as proposed, will not have an impact on any known tribal historic, religious, or cultural resources.

Secondary Impacts No adverse secondary impacts are anticipated from this project.

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PUBLIC PARTICIPATION The project was discussed at two township board meetings. The project plan was subject to a public hearing on June 8, 2017. No member of the public attended. The Monroe County Drain Commission formally adopted the project plan at its June 20, 2017, meeting.

REASONS FOR CONCLUDING NO SIGNIFICANT IMPACTS No long-term significant impacts are associated with this project. Long-term positive impacts include improved operation of the Bedford Township WWTP, pump stations, and the replacement of structurally deficient sewers and manholes. The benefits of the proposed project are anticipated to outweigh the short-term adverse construction related impacts.

Questions regarding the Environmental Assessment should be directed to:

Ms. Sonya T. Butler, Manager

Revolving Loan Section Drinking Water and Municipal Assistance Division

Michigan Department of Environmental Quality P.O. Box 30817

Lansing, Michigan 48909-8311 Telephone: 517-284-5433

E-Mail: butlers2@michigan.gov

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