Simsbury_WPCF_SWPPP_2022.pdf

TOWN OF SIMSBURY

STORMWATER POLLUTION PREVENTION PLAN

36 Drake Hill Road, Simsbury, CT

PREPARED FOR:

Town of Simsbury Water Pollution Control Facility 36 Drake Hill Road Simsbury, CT 06070

PREPARED BY:

Atlas Technical Consultants LLC 290 Roberts Street-Suite 301 East Hartford, CT 06108 July 5, 2023

Page | 1

290 Roberts Street-Suite 301 East Hartford, CT 06108

(860) 282-9924 | oneatlas.com

June 23, 2023 Atlas No. 2419023002

Mr. Thomas J. Roy, PE

TOWN OF SIMSBURY – WATER POLLUTION CONTROL FACILITY

36 Drake Hill Road Simsbury, Connecticut 06070

Subject: Stormwater Pollution Prevention Plan (SWPPP)

Dear Mr. Roy, Atlas is pleased to present this Stormwater Pollution Prevention (SWPP) Plan for the Town of

Simsbury Water Pollution Control Facility (WPCF). This SWPP Plan has been prepared in accordance with the Connecticut Department of Energy & Environmental Protection (CT DEEP)

General Permit for the Discharge of Stormwater Associated with Industrial Activity (Stormwater

General Permit), effective November 1, 2011, which requires a SWPP Plan.

If you have any questions, please call us at (860) 282-9924.

Respectfully submitted, Atlas Technical Consultants LLC

Luke Whitehouse Kay Lehoux Environmental Division Manager Environmental Compliance Manager

Distribution: troy@simsbury-ct.gov

Page | i

CONTENTS

EMERGENCY CONTACT AND NOTIFICATION LIST

1. INTRODUCTION

2. FACILITY INFORMATION

Facility Information

Facility Description

Structures and Operations Potentially Exposed to Stormwater

2.3.1 Septage Unloading Area

2.3.2 Thickened Sludge Loading Area

2.3.3 Maintenance Equipment and Material Unloading

2.3.4 Vehicle Equipment Washing

2.3.5 Aboveground Storage Tank

2.3.6 Roof Drains and Vents

2.3.7 On-site Waste Disposal

2.3.8 Groundwater

2.3.9 Salt Storage Piles or Piles Containing Salt

2.3.10 Dust Generation and Vehicle Tracking of Industrial Materials

2.3.11 Other Potential Pollutant Sources

Spill History

3. STORMWATER POLLUTION PREVENTION TEAM

Team Members and Individual Responsibilities

Team Responsibilities

4. STORMWATER MANAGEMENT

Facility Drainage

Control Measures

4.2.1 Good Housekeeping

4.2.2 Vehicle or Equipment Washing

4.2.3 Floor Drains

4.2.4 Roof Areas

4.2.5 Minimize Exposure

4.2.6 Sediment and Erosion Control

4.2.7 Management of Runoff

4.2.8 Preventative Maintenance

4.2.9 Spill Prevention and Response

4.2.10 Future Construction

4.2.11 Non-Stormwater Discharges

Stormwater Monitoring and Reporting

4.3.1 Schedules and Test Parameters

Sector Specific Monitoring Requirements

Page | ii

Impaired Waters Monitoring Requirements

4.3.2 Sample Collection

4.3.3 Recordkeeping and Reporting Requirements

5. TRAINING, INSPECTIONS, AND RECORDKEEPING

Training

Inspections

5.2.1 Routine Inspections

5.2.2 Stormwater Visual Inspections

5.2.3 Stormwater Comprehensive Site Compliance Evaluations

Recordkeeping

6. CORRECTIVE ACTIONS AND ADDITIONAL IMPLEMENTATION MEASURES

7. PLAN REVIEW AND AMENDMENT

8. IMPLEMENT ITEMS

TABLES

Table 1 – Emergency Contact and Notification List

Table 2 – Structures and Operations Potentially Exposed to Stormwater

Table 3 – Control Measures

Table 4 – Stormwater Sampling Parameters and Limits

Table 5 – Implementation Items

FIGURES

Figure 1 Site Locus

Figure 2 Site Plan

APPENDICES

Appendix A Certifications

Appendix B Inspection Logs and Forms

Appendix C Training and Plan Revision Logs

Appendix D Spill Documentation and Notification Form

Appendix E Stormwater Sampling Forms and Results

Page | 1

EMERGENCY CONTACT AND NOTIFICATION LIST

Table 1 – Emergency Contact and Notification List

Spill Management Team

Name Title Office Cell

Anthony Piazza WPCA Superintendent 860-658-3258 --

Thomas J. Roy, PE DPW Director and Town Engineer 860-658-3222 860-982-3724

Federal, State, and Local Agencies

Town of Simsbury Fire Department Local Fire Department/Fire Marshal Patrick T. Tourville

911 860-658-1971

Town of Simsbury Police Department Local Police Department/Chief Nicholas Boulter

911 860-658-3101

Connecticut Department of Energy and Environmental Protection (CTDEEP)

CTDEEP 866-337-7745 (24 hr.) --

National Spill Response Center Spill Reporting 800-424-8802 (24 hr.) --

US EPA (Region 1) New England EPA Resource 617-223-7265 (24 hr.) --

Spill Response Contractors and Other Services

Environmental Services Inc. (ESI) Spill Cleanup 800-486-SPIL (7745)

University of CT Health Center (Farmington)

Human Health Hazards 860-298-8442 --

Atlas Technical Consultants, LLC (Atlas)

Consultant 860-282-9924 --

Kay Lehoux (Atlas) Environmental Compliance Manager

860-466-6002 860-933-9657

1. INTRODUCTION

This Stormwater Pollution Prevention Plan (SWPPP) has been prepared for the Town of Simsbury’s Water Pollution Control Facility located at 36 Drake Hill Road in Simsbury, Connecticut (hereafter referred to as the “Site”). This SWPPP has been prepared in accordance with the Connecticut Department of Energy and Environmental Protection (CTDEEP) General Permit for the Discharge of Stormwater Associated with Industrial Activity (Stormwater General Permit), effective October 1, 2019, which requires a SWPPP.

The Stormwater General Permit is applicable if a facility meets both of the following qualifications:

The facility meets the definition of “industrial activity”. Under the Stormwater General Permit, “industrial activity” includes numerous Standard Industrial Classification (SIC) codes and descriptive categories ■YES �NO

Facility SIC code (Section 5(c)(2)(A)): 4952

Sector of Industrial Activity: Sector G

1) The facility discharges stormwater that may come into contact with an “industrial activity”. Any stormwater associated with an “industrial activity” on site is included.

■YES �NO

Page | 2

As the Site is a covered “industrial activity” and it conducts industrial activities of which are exposed to stormwater, it is required to register under the Stormwater General Permit and prepare a SWPP Plan.

This SWPPP describes the procedures, methods and equipment used to prevent the contamination of stormwater. This SWPPP is intended to meet the planning requirements of the Stormwater General Permit and, as such, a copy of this SWPPP will be kept on Site at all times.

2. FACILITY INFORMATION

Facility Information

Name: Town of Simsbury Water Pollution Control Facility

Address: 36 Drake Hill Road Simsbury, CT

Phone No.: 860-658-1380

Facility Operations: Municipal Water Pollution Control

Owner: Town of Simsbury

Operator: Town of Simsbury

Primary Contact: Anthony Piazza, Superintendent 860-658-3258

Alternate Contact: Thomas J. Roy, PE, DPW Director and Town Engineer 860-982-3724

Industrial activities at the Site includes vehicle/equipment cleaning, maintenance and storage, waste oil and metal storage, septate unloading, thickened sludge loading, and the outdoor storage of various treatments utilized at the WPCF.

Page | 3

Facility Description

Structures and Operations Potentially Exposed to Stormwater

The following table describes the activities at the Site of which may be exposed to precipitation.

Table 2 – Structures and Operations Potentially Exposed to Stormwater

Structure or Activity Location Potential Pollutants Materials Management

Practices

Interior

Septage Unloading Area Southwestern building

Septage Rubber mats to cover storm drains; on-site vacuum truck

Exterior

Thickened sludge loading area Northern bay doors on southwestern building

Septage Rubber mats to cover storm drains; on-site vacuum truck

Maintenance equipment and material unloading

Maintenance building west of Site entrance

Hydrocarbons, oil and grease, metals, sodium bisulfite

Rubber mats to cover storm drains; on-site vacuum truck; absorbent materials on-site

Former Vehicle washing (5,500-gallon tanker truck)

Maintenance building west of entrance

Hydrocarbon, oil, and grease

This vehicle washing area is no longer in use.

On-site waste disposal Exterior of maintenance

Metals, battery fluid, hydrocarbons, oil and grease

Frequent recycling of batteries;

The Site is located on an approximately 25.15-acre parcel of land owned and operated by the Town of Simsbury. The Site receives wastewater via municipal sanitary sewer networks. Raw wastewater is screened for abrasive and/or clogging material before primary treatment. Primary treatment occurs within a large tank and includes removing solid material (“sludge”) at the base of the tank. Remaining water is subjected to biodegrading bacteria before entering the final tank for ultraviolet light disinfection. Disinfected water is discharged directly to the Farmington River, which abuts the Site to the south. Sludge is processed on-site in covered tanks before being transported to the Metropolitan District Commission (MDC) treatment facility in Hartford for incineration.

The Site has primary clarifying tanks, aerobic and anaerobic basins, secondary clarifying tanks, UV treatments, pump stations, sludge storage tanks, an electrical service building, a pole-barn utilized for equipment storage, and sludge processing. The small building on the eastern boundary of the Site contains an attached weir (Outfall 1), which collects stormwater from the Site prior to discharging to the Farmington River, located immediately east.

An emergency generator is located on-Site, which is fed by an on-Site diesel, aboveground storage tank (AST). Two (2) convault-fueling stations are located on-Site as well (diesel and gasoline).

Municipal Solid Waste (MSW) dumpsters are located between two (2) small buildings west of the Site entrance.

Figure 1 depicts the site area. Figure 2 depicts the Site Plan.

Page | 4

The subsections below discuss the activities in the table above and others at the facility, which could potentially cause stormwater pollution.

2.3.1 Septage Unloading Area

2.3.2 Thickened Sludge Loading Area

2.3.3 Maintenance Equipment and Material Unloading

building west of entrance

On-site Waste Disposal Practices

Disposal of thickened sludge Northern portion of Site

Septage Thickened sludge is compressed and dried prior to removal off-site to prevent contamination.

Solid Waste Dumpsters Northwestern side of the Site.

Total metals, TSS Dumpsters are equipped with closing lids, and drain plugs are intact. All refuse is stored inside the dumpsters, and not on the surrounding areas.

Area septage haulers unload into a septage-holding tank located at the Secondary Pumping Building.

The area is uncovered. The main pollutant source would be spilled septage. The area is relatively level, allowing for limited spreading of potential spills (typically a few gallons). A rubber mat is available for the nearby catch basin. A vacuum truck is available and used to collect and properly collect and dispose of spilled septage.

Thickened municipal wastewater sludge is loaded into a tanker and hauled to the MDC in Hartford, Connecticut for incineration. Much of the loading area is uncovered. The loading Standard Operating Procedures (SOP) has been developed to minimize the potential for spills. A rubber mat is available to isolate the nearby catch basin. A vacuum truck is available and utilized to collect and properly dispose of spilled septage.

The unloading area for maintenance equipment and materials is located in front of the maintenance garage. The area is uncovered. The potential pollutant sources for this area includes oil, grease, and fine particulate runoff from equipment or dry polymer. A forklift is utilized to carefully remove materials from tractor-trailers. The materials are moved immediately into the garage for proper storage and/or unpacking. Dry polymer in plastic bags is unloaded near the sludge loading area with a forklift. The material is dry and if spilled would be readily cleaned up. The pallet of polymer is immediately moved inside for storage.

Sodium bisulfite, utilized to dechlorinate effluent materials, is stored in approximately 10 55-gallon drums in the main building. The drums are carefully inspected as they are unloaded to identify potential sources of leakage. Absorbent material is present nearby in case of release. Mobile machinery (i.e., portable genset, portable pumps, etc.) are stored properly and covered.

Page | 5

2.3.4 Vehicle Equipment Washing

2.3.5 Aboveground Storage Tank

2.3.6 Roof Drains and Vents

2.3.7 On-site Waste Disposal

2.3.8 Groundwater

2.3.9 Salt Storage Piles or Piles Containing Salt

Previously, vehicles were washed in the Septage RCVG area, where wastewater would enter into the wastewater treatment system. This practice is no longer in use, and vehicles are no longer washed at the facility.

Two (2) ASTs are located southeast of the Main Electrical Service building. The ASTs store diesel and gasoline utilized on-Site.

One AST is located south of the Sludge Processing/Office/Lab Building, and reportedly contains diesel for use on-site. An emergency diesel generator is located east of the Main Electrical Service Building, and is utilized for power outages.

The ASTs are periodically checked for leaks or damage that may result in a release to the environment.

Absorbent material is stored nearby.

The buildings are equipped with roof drains. The drains discharge to the pavement via downspouts.

Stormwater on pavement sheet flows to catch basins located throughout the paved area and then to the Site outfall. Stormwater on grassy area eventually infiltrates into the ground.

Two (2) 55-gallon drums of waste oil are stored on a modular spill containment platform in the maintenance garage. Potential release can occur during pumping out or filling of the tanker truck.

Trained personnel are available during pumping procedures. A spill kit is available to absorb spilled oil and prevent entry into interior floor drains. Floor drains are connected to the municipal stormwater system. Empty chemical containers and spent chemicals (i.e., used brake fluids, batteries, etc.) are stored within the main building. An exterior trench drain is located on the southwest side of the Sludge Processing/Office/Lab Building. This trench drain is connected to sanitary sewer which is regularly inspected. There is also an interior trench drain which is not exposed to precipitation. This trench drain is also connected to sanitary sewer.

The Site is constructed on the Farmington River floodplain and is surrounded by a flood protection berm. A perimeter drain is installed to control the groundwater level around the facility. The stormwater and groundwater are discharged through a common pipe, and regularly inspected for visual signs of contamination.

This section is not applicable because there are no salt piles located at the facility.

Page | 6

2.3.10 Dust Generation and Vehicle Tracking of Industrial Materials

2.3.11 Other Potential Pollutant Sources

Spill History

Per the Stormwater General Permit, spills, and leaks of 5 gallons or more of toxic or hazardous substances that occurred at the facility at least three years prior to this SWPPP’s certification should be included in the facility spill history.

Table 3 – Spill History

Date Material

Released Amount (gals)

Terminated? Description

3/11/2011 Sewage Unknown Yes An ongoing release of sewage was reported as entering the Farmington River, caused by a rain event. Spill Case No. 201101178 is listed as closed.

The parking and driving areas are asphalt and therefore, dust generation due to vehicular traffic is insignificant.

There are no other known potential pollutant sources.

Page | 7

3. STORMWATER POLLUTION PREVENTION TEAM

Team Members and Individual Responsibilities

The Stormwater Pollution Prevention Team at the Facility includes the following members.

Anthony Piazza, Team Leader WPCF Superintendent Telephone Number: 860-658-3258 (office) Responsibilities: Coordinate all stages of Plan development, inspections, and implementation; coordinate training program; keep all records and ensure appropriate submittals; and oversee sampling program.

Thomas J. Roy, PE, Assistant Team Leader Director of Public Works Telephone Number: 860-658-3222 (office) Responsibilities: Assist the Team Leader with implementation of the Plan.

Team Responsibilities

The Stormwater Pollution Prevention Team is familiar with all aspects of this Plan and facility processes and activities, as well as the location of and characteristics associated with oil and chemical substances handled and stored at the Facility. They are also familiar with the location of records pertinent to the SWPP Plan within the facility and the facility layout.

The Team is responsible for Plan development, maintenance, and implementation. Team responsibilities include:

1. Develop and implement Control Measures inspection and review procedures;

2. Conduct or oversee regular compliance inspections of the facility and assure documentation and review of these inspections;

3. Review analytical data from storm events for compliance with regulations;

4. Review new construction or facility modifications or changes, as necessary;

5. Make changes in procedures, as necessary, and proper notifications, if required; and

6. Update or revise the SWPPP, as necessary.

Page | 8

4. STORMWATER MANAGEMENT

Section 4.0 presents a description of stormwater management at the Site and stormwater procedures implemented by facility personnel. This section is divided into three subsections, which discuss (1) Facility

Drainage, (2) Control Measures, and (3) Stormwater Monitoring. These subsections are presented below.

Facility Drainage

Control Measures

4.2.1 Good Housekeeping

4.2.2 Vehicle or Equipment Washing

Good housekeeping practices are designed to maintain a clean and orderly work environment. Often the most effective first steps towards preventing pollution in stormwater from industrial sites involves using common sense to improve the facility’s basic housekeeping methods. The following are good housekeeping practices completed at the facility:

- Implementing careful material storage practices

- Maintaining up-to-date material inventory

- Identify all chemical substances present in the workplace

- Label all containers showing name and type of substance, stock number, etc.

- Scheduling routine cleanup operations

- Maintaining well-organized work areas

- Training employees about good housekeeping practices

- All areas around this facility are kept free of refuse and trash.

- Lids are kept closed on trash dumpsters (where applicable), drain plugs are intact, and the areas are regularly inspected.

The pickup and disposal of waste products at the facility occur on a routine basis. The municipal dumpster is disposed of by municipal waste disposal contractors. Sludge roll-offs are removed off-site by an authorized waste disposal contractor when full. All used and emptied drums and hazardous substances are stored within the buildings or under cover. These containers are picked up on a routine basis by the oil/hazardous substance contractor and replaced with new storage containers.

Employees at the facility routinely inspect operational equipment and storage areas throughout the daily workday. Drums and storage containers are inspected before and during usage of the materials stored within. The drums and other storage containers are placed on top of appropriately sized secondary containment or stored away from exterior openings inside the buildings. All tanks at the facility are inspected via the routine and semiannual inspection sheets attached in Appendix B.

Employees also routinely inspect outdoor storage areas for staining and leaks from tanks and the fueling station.

Vehicle and/or equipment washing is not conducted at the facility.

Page | 9

4.2.3 Floor Drains

4.2.4 Roof Areas

4.2.5 Minimize Exposure

4.2.6 Sediment and Erosion Control

All floor and trench drains are connected to the in-plant pumping station, which discharges into the facility’s wastewater treatment system.

Roof drainage discharges to the pavement surrounding the buildings and into catch basins which ultimately discharge to the municipal stormwater system or is discharged via sheet flow into grassy areas where it is infiltrated into the ground.

Manufacturing operations that encounter precipitation (primary clarifiers) are entered into the wastewater treatment system and treated prior to discharge. All other manufacturing operations (aerobic and anaerobic basins, secondary clarifiers, sludge storage, etc.) are not exposed to precipitation.

All vehicle maintenance operations are performed inside the buildings at the Site. WPCF service vehicles/equipment are typically stored inside buildings overnight, or on permeable surfaces. All vehicle repairs/maintenance will be performed indoors. To the extent practicable, dumpster storage of general refuse is covered. Sludge roll-offs are kept inside and under cover.

Loading and unloading of gasoline and diesel operations from on-Site ASTs utilize proper hose connections and are always supervised by an on-Site employee. The loading dock is covered.. The loading of waste oil is completed within the main building. The unloading and loading of materials (oil drums, sludge, etc.) is completed by competent personnel and is always supervised by on-Site staff.

Routine inspections occur monthly.

Materials stored outside are equipped with secondary containment and are covered. The ASTs are properly labeled and refuse and/or sludge are stored in covered dumpsters. Routine inspections occur monthly.

Materials stored inside are equipped with secondary containment or on impermeable surfaces and are stored away from exterior doorways. All materials are properly labeled, and routine inspections are completed monthly.

The facility's SWPPP must identify activities that present a potential for significant soil erosion and measures taken to control such erosion. There are several grassy or riprapped areas throughout the facility. These areas are curbed and well maintained, and do not currently cause erosion concerns.

Erosion and sediment control should be monitored as part of the annual visual inspections to ensure no new erosion concerns begin at the facility.

Page | 10

4.2.7 Management of Runoff

4.2.8 Preventative Maintenance

For the purposes of this SWPPP, runoff management is defined as practices which divert, infiltrate, reuse, or treat stormwater runoff, and not practices that limit exposure of potential pollutants to direct rainfall or runoff.

There are two drainage areas at the facility, which are further described below.

Drainage Area 1 consists of the southern portion of the Site, and includes secondary clarifiers, the Sludge Processing/Office/Lab Building, sludge storage, an electrical building, an emergency generator, UV Disinfection, pump buildings, and ASTs. There are 12 catch basins associated with this drainage area. Stormwater runoff follows the graded slope of the surrounding area and is directed via curb lines and paved areas to nearby catch basins. Some areas utilize sheet flow and infiltration into the ground. Stormwater from Drainage Area 2 is passed into this drainage area, where stormwater is mixed with Drainage Area 1 stormwater and discharged at the outfall, located on the southeastern corner of the site (weir).

Drainage Area 2 consists of the northern-most portion of the Site, includes the Pole Barn, the primary anoxic and aeration tanks, primary clarifiers, pump buildings, and pretreatment. There are 10 catch basins associated with this drainage area. Stormwater runoff follows the graded slope of the surrounding area and is directed via curb lines and paved areas to nearby catch basins. Some areas utilize sheet flow and infiltration into the ground. Stormwater infrastructure in this area directs stormwater into Drainage Area 1.

A preventative maintenance program involves inspections and maintenance of stormwater management devices and routine inspections of facility operations to detect faulty equipment.

Equipment (such as tanks, containers, and drums) will be checked regularly for signs of deterioration.

All areas of the facility will be inspected for the following at appropriate intervals as specified in Section 5.2 of this Plan. All areas of the facility will be inspected for the following at appropriate intervals as specified in Section 5.1 of this Plan:

- Leaks or conditions that would lead to discharges;

- Conditions that could lead to direct contact of storm water with raw materials, intermediate materials, waste materials or products;

- Storage tanks and totes, process and material handling equipment, and material bulk storage areas for leaks, corrosion, or other deterioration or non-containment.

All operational equipment at the facility is inspected before usage. If any leaks or spills are noted, or damage to the equipment, the equipment is taken out of production until repairs are completed.

Page | 11

4.2.9 Spill Prevention and Response

4.2.10 Future Construction

4.2.11 Non-Stormwater Discharges

Table 4 contains a summary of the potential pollutant sources at the Site and how some of the Control Measures discussed above apply to each.

Areas where spills are likely to occur and their drainage points were identified in Section 2.3 of this SWPPP. Employees will be aware of material handling and storage requirements, spill response procedures, and clean up procedures. Detailed spill response procedures are included in the facility’s SPCC Plan. In addition, there will be appropriate spill cleanup equipment and access to that equipment.

Spill prevention and response procedures currently implemented or that will be implemented are:

• Good housekeeping practices.

• Regular visual inspections to identify areas for potential leaks or spills.

• Identification of a spill response team to implement the spill response plan.

• Identification of safety measures.

• Procedures for notifying appropriate authorities (Police, Fire, Hospital, Publicly Owned Treatment Works, etc.) in the event of a spill.

• Spill containment, diversion, isolation, and cleanup practices.

Each tank, drum, or piece of operational equipment are stored within secondary containment or in a manner to reduce the spread of any spills or leaks at the facility. All state of Connecticut notification requirements are followed in the event of a spill at the facility. Spill kits and absorbents are stored throughout the facility to help prevent the spread of a spill. Specific spill response procedures and total storage quantity can be found in the facility’s SPCC Plan.

Any future construction activity that disturbs greater than one (1) acre will be conducted in accordance with CT DEEP regulations and will comply with the 2002 Connecticut Guidelines for Soil Erosion and Sediment Control during construction, and the 2004 Connecticut Stormwater Quality Manual for the design and implementation of post-construction stormwater management measures. The Site will avoid, wherever possible, the use of copper or galvanized roofing or building materials for any new building construction where these materials will be exposed to stormwater.

The stormwater drainage system at the Site was observed by Atlas in June 2023 to determine if there were any non-stormwater-related discharges occurring. The Site is constructed on a Farmington River flood plain; therefore, groundwater beneath the Site discharges to the Farmington River immediately east. A perimeter drain is installed to control the groundwater level. Stormwater and groundwater are discharged through the same outfall pipe (Outfall-1). The Site discharges wastewater under an individual NPDES permit (No. CT0100919).

Page | 12

Table 4 – Control Measures

Potential Pollutant Source

Good Housekeeping Minimize Exposure Spill Prevention

Septage unloading area Maintain area in reasonable clean condition.

Spills are to be immediately cleaned up with an absorbent.

Spigots or funnels are used to minimize drips or leaks when transferring fluids.

Maintain spill response equipment nearby.

Thickened sludge loading area

Maintain area in reasonable clean condition.

Minimize loading during rain events.

Do not overfill vehicles.

Monitor all product transfer events.

Maintain spill response equipment nearby.

Maintenance equipment and material unloading

Maintain area in reasonably clean condition.

Spills are to be immediately cleaned with an absorbent.

Store materials in covered area, inside building, or within secondary containment.

Maintain equipment in proper working condition.

Minimize loading during rain events.

Hydraulic equipment is kept in good repair and drips are cleaned up promptly.

Do not overfill vehicles.

Monitor all product transfer events.

Maintain spill response equipment nearby.

Diesel & Gasoline ASTs Maintain area surrounding ASTs in reasonably clean condition.

Minimize ASTs transfers during rain events.

Maintain spill response equipment nearby.

Periodically check AST for leaks or any other observable damage.

AST filling area will be inspected regularly for signs of leakage, and qualified personnel trained in spill response will observe all transfers to and from the tank.

Materials storage Maintain areas in reasonably clean condition.

No drums (empty or full, open or closed) or used pallets are stored outdoors or uncovered with the exception of sodium bisulfite drums.

Liquid and dry material storage is confined to a specific indoor area with proper containment and separation of potentially volatile materials.

Maintain spill response equipment nearby.

Periodically check storage receptacles for damage or leaks;

Page | 13

Stormwater Monitoring and Reporting

The Stormwater General Permit specifies required stormwater monitoring. The Site has completed the required benchmark monitoring for the Permit. As such, the following information is for informational purposes only.

The stormwater discharge location is depicted on Figure 2. The Stormwater Monitoring Program outlined in the Stormwater General Permit specifies that the facility is required to fulfill stormwater sampling and analytical testing requirements associated with stormwater discharge from Outfall 1.

4.3.1 Schedules and Test Parameters

The Stormwater General Permit requires semi-annual testing and specifies the parameters to be analyzed in the stormwater outfall sample. Table 5 summarizes the parameters to be tested for in the stormwater sample collected from the outfall.

Certain industrial facilities are required to comply with numeric effluent limits determined by the EPA as specified in the Stormwater Industrial General Permit in “Additional Requirements for Certain Sectors” (Section 5(f)).

The facility is subject to effluent limitations □ YES NO

Stormwater from the facility discharges to the following waterbody ................................... Farmington River

The area of this waterbody to where stormwater from the Facility discharges is designated as an impaired waterbody.

YES □ NO

This waterbody is impaired due to the presence of the following contaminants.

Table 5 – Stormwater Sampling Parameters and Limits

On-site waste disposal Maintain area in reasonably clean condition.

Oily wastes are kept separate from other wastes, especially solvents.

Wastes are transferred offsite on a regular basis.

Spent radiator coolants (antifreeze) are kept in a covered container.

Spent batteries are stored indoors and recycled on a regular basis.

Ensure proper cover and plug on solid waste Dumpster.

Maintain spill response equipment nearby.

Periodically check storage receptacles for damage or leaks.

Sampling Parameter1 Regulatory Criteria Sampling Frequency

S.U.2

Uncontaminated Rainfall pH NE3 Semi-Annual4

Stormwater pH 5-9 Semi-Annual mg/L5

Total Copper 0.059 Semi-Annual

The Farmington River is impaired with E.coli.

Page | 14

SECTOR SPECIFIC MONITORING REQUIREMENTS

There are no sector specific monitoring requirements associated with the Site.

IMPAIRED WATERS MONITORING REQUIREMENTS

Any potential discharge through the outfall would reach the Farmington River. The portion of the Farmington River near the Site is considered an impaired waterway (E. coli with established TMDL).

For stormwater discharges to waters for which there is an established TMDL, the permittee is not required to monitor for the indicator pollutant (E.coli) unless informed by writing by the CTDEEP.

4.3.2 Sample Collection

Sampling should be conducted according to the following criteria.

1. Sampling is to be conducted during a storm event generating a stormwater discharge that occurs at least 72 hours after any previous storm event that generated a stormwater discharge. This is referred to as a qualifying event.

2. Monitoring events are to be separated by at least 30 days.

3. Grab samples are to be used for all monitoring. Grab samples are to be collected within the first 30 minutes of a storm event discharge.

4. All samples must be taken during the same storm event, if feasible.

5. Stormwater discharge containing snow or ice melt may be used, but must be noted on the sample reporting form.

For each storm event monitored, the following information is collected.

1. The date, discharge temperature, time of the start of the discharge, time of sampling at each outfall and magnitude (in inches) of the storm event sampled; and

2. The duration between the storm event and the end of the previous stormwater discharge event.

Total Lead 0.076 Semi-Annual

Total Zinc 0.160 Semi-Annual

Total Suspended Solids 90 Semi-Annual

Total Oil and Grease 5 Semi-Annual

Chemical Oxygen Demand 75 Semi-Annual

Total Phosphorus-P 0.40 Semi-Annual

Total Kjeldahl Nitrogen 2.30 Semi-Annual

Nitrate-N 1.10 Semi-Annual

Aquatic Toxicity LC50≥50%6 Annual7

Notes:

1. All parameters listed in table are Standard Monitoring Benchmarks unless otherwise noted.

2. SU = Standard Units

3. NE = None Established

4. The semi-annual monitoring periods are October 1 to March 31 and April 1 to September 30.

5. mg/L = milligrams per liter

6. The 48-hour Acute Toxicity LC50 value (% Survival) must be greater than 50%.

7. Aquatic Toxicity monitoring is required annually for the first two (2) years of sampling. The monitoring period is October 1st to September 30th.

Page | 15

The following outline describes the stormwater sample collection and laboratory testing procedures followed for the outfall.

1. Collect the samples directly from the outfall. Fill the collection containers with stormwater without touching the insides of the containers. Cover the containers when finished.

2. Label all samples and store samples in a cooler or refrigerator at 4o C.

3. Prepare a Chain of Custody and transport the samples to the laboratory as soon as possible (less than 24 hours after sampling).

4. Unless otherwise specified in the Stormwater General Permit, all pollutant parameters must be tested according to methods prescribed in 40 CFR 136.

5. Acute toxicity biomonitoring tests must be conducted according to the procedures specified in Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms, 5th edition (EPA 821-R-02-012).

4.3.3 Recordkeeping and Reporting Requirements

For each stormwater sample taken, the following information is recorded.

1. The place, date and time of sampling;

2. The person(s) collecting the samples;

3. The dates and times the analyses were initiated;

4. The person(s) or laboratory who performed the analyses;

5. The analytical techniques of methods used; and

6. The results of all required analyses.

A log for recording this data is presented in Appendix E.

After collection of four (4) semi-annual samples, if the average of the 4 monitoring values for any parameter does not exceed the benchmark, the monitoring requirements for that parameter have been fulfilled for the term of the Stormwater General Permit. Once the benchmark for sample pH has been met and monitoring for pH has been fulfilled, the measurement of rainfall pH is no longer required.

Within 120 days of receiving the results of the fourth semi-annual sample, if the average of the 4 semi-annual monitoring values for any parameter exceeds the benchmark, the Town will review the selection, design, installation and implementation of the Control Measures to determine if modifications are necessary to meet the benchmarks, and either:

Make the necessary modifications to the Control Measures and SWPP Plan and continue semi-annual monitoring until 4 consecutive semi-annual monitoring events have been completed for which the average does not exceed the benchmark; or

Decide that no further pollutant reductions are technologically available and economically practicable and achievable in light of best industry practice to implement additional control measures or meet the benchmarks, in which case the Facility must continue monitoring once per year. The Site will also document the rationale for concluding that no further pollutant reductions are achievable and submit this documentation to the CT DEEP for written approval. The Site will retain all records related to this documentation with the SWPP Plan.

Page | 16

If an exceedance of the 4-event average is mathematically certain, the Site will review the control measures and perform any required corrective action immediately or document because no corrective action is required, without waiting for the full four (4) monitoring events. If, after modifying the control measures and conducting additional semi-annual monitoring, the average of the most recent four (4) monitoring events still exceeds the benchmark, or if an exceedance of the benchmark by the 4-event average is mathematically certain for the most recent four (4) monitoring events, the Site will again review the control measures and take one of the two actions above.

The CTDEEP has established a Stormwater Monitoring Report (SMR) Form that is to be completed and submitted for each outfall sampled. Monitoring results are submitted to the CTDEEP within 90 days of the date of the sampling. If a discharge does not occur during a monitoring period, a SMR must still be submitted, and a notation of “No Discharge” will be made on the form.

A signed and dated original of the SMR Form is submitted to the CT DEEP at the following address:

Water Toxics Program Coordinator Bureau of Water Protection and Land Reuse Department of Energy & Environmental Protection 79 Elm Street Hartford, CT 06106-5127

A sample copy of an SMR is found in Appendix E. Copies of the completed SMRs may be kept in Appendix E. If the Site monitors its stormwater more frequently than required by the Stormwater General Permit, it will also report those results to the CTDEEP.

At this time, the Site has met all sampling requirements and is not required to submit an SMR to

CTDEEP.

Page | 17

5. TRAINING, INSPECTIONS, AND RECORDKEEPING

This section of the SWPPP describes the Training, Inspections, and Recordkeeping procedures for the Site. Appendix B contains recordkeeping log forms for training and Plan revisions. All records of inspections, training and Plan revisions are maintained by the Stormwater Pollution Prevention Team and may be kept with the SWPPP.

Training

All training will be held on an annual basis. Any personnel associated with Site operations or product handling at the Site is required to attend the training. All new employees that will be engaged in operations that have a potential to impact stormwater must also be trained within the first three months of employment.

The training topics include the following items:

1. Instructions on the contents of this SWPP Plan.

2. Discussion of the Stormwater Pollution Prevention Team and its responsibilities.

3. A review of the proper Control Measures to be used by employees on a regular basis, including spill prevention and response; standard housekeeping measures; and materials and waste handling procedures.

4. A review of the most recent stormwater Comprehensive Site Compliance Evaluation results and any resulting changes to the SWPP components of this Plan.

Inspections

The Stormwater Pollution Prevention Team is responsible for the entire Site and its proper operation. Site inspections are conducted by at least one member of the Team or by a qualified professional.

Inspection logs for this SWPPP have been developed for the Site. The logs are designed to meet the inspection requirements of the Stormwater General Permit regulation. A copy of the logs is presented in Appendix B with a table summarizing this inspection schedule. Records of inspections are maintained by the Stormwater Pollution Prevention Team and may be kept with the SWPPP. The sections below describe the components of the Site inspections.

5.2.1 Routine Inspections

Routine inspections will be completed monthly. The inspections will include designated equipment and storage areas, loading and unloading areas, and waste management areas. Inspections will be documented on the form in Appendix B – Routine Facility Inspections. Records of inspections shall be maintained on-site or in a readily accessible location for at least three years after the date of the inspection.

5.2.2 Stormwater Visual Inspections

The facility will perform and document visual examinations of storm water discharges from each outfall quarterly. For monitoring purposes, quarters will begin on January 1, April 1, July 1, and October 1 each year. Inspections are conducted during a qualifying rain event. If no qualifying rain event occurs during the quarter, a letter will be entered into the file documenting such. Visual monitoring of stormwater is conducted during the first 30 minutes of the rain event. Visual examination reports shall be maintained as a part of this SWPPP and be made available to CT DEEP representatives upon request. Each report shall include the date and time, name of the person performing examination, nature of discharge (runoff or snow melt), visual quality of the discharge (i.e., color, odor, clarity, floating solids, suspended solids, foam, oil sheen, and other indicators of stormwater pollution) and probable sources of any observed contamination.

Page | 18

If the visual assessment indicates the Control Measures for the facility are inadequate or are not being properly operated and maintained, the facility will review and revise the selection, design, installation and implementation of the Control Measures to ensure that the condition is eliminated and will not be repeated in the future. Examinations will be documented on the form in Appendix B– Quarterly Visual Examination of Stormwater Quality.

5.2.3 Stormwater Comprehensive Site Compliance Evaluations

Comprehensive site compliance evaluations (CSCE) are conducted on a semiannual basis by one or more persons either on or designated by the Stormwater Pollution Prevention Team. When possible, CSCEs are conducted during a rainfall event. These evaluations will include:

• Visual inspection of areas contributing to a stormwater discharge associated with industrial activity for evidence of, or the potential for, pollutants entering the stormwater drainage system;

• Evaluation of measures to reduce pollutant loadings to determine whether they are adequate and properly implemented in accordance with the terms of the permit or whether additional control measures are needed;

• A visual evaluation as to the availability of equipment needed to implement the plan, such as spill response equipment and containment drums, shall be made to determine it is functioning properly and drums are not corroded.

• Examinations will be documented on the form in Appendix B – Semi-Annual Comprehensive

Site Compliance Evaluation. The evaluation form includes a resolution to any non-compliance or changes that are required within 30 days. If no compliance issues are found, the evaluation will denote as such.

Examinations will be documented in Appendix B-Semi-Annual Comprehensive Site Compliance Evaluation. The evaluation forma includes a resolution to any non-compliance or changes are required within 30 days. If not compliance issues are found, the evaluation will denote as such.

Recordkeeping

This SWPPP and all training, inspection, recordkeeping and testing records associated with it are maintained at the Site for a minimum of five years following the expiration of the Stormwater General Permit.

Records are signed by an appropriate supervisor, where applicable. Modifications to this Plan are recorded in the Revisions Log in Appendix C.

Page | 19

6. CORRECTIVE ACTIONS AND ADDITIONAL IMPLEMENTATION MEASURES

Corrective actions will be implemented when any of the following occur:

• An unauthorized release or discharge (e.g. spill, leak, or discharge of non-stormwater not authorized by this or another permit) occurs at your facility.

• A visual examination of stormwater quality identifies an issue that may create contamination to stormwater.

• You become aware, or CT DEEP determines, that your control measures are not stringent enough for the discharge to meet applicable water quality standards.

• Routine facility inspections identify issues that may create contamination to stormwater.

• Comprehensive site compliance evaluations identify issues that may create contamination to stormwater.

• There is any exceedance of benchmark sampling.

The permittee must retain a copy of the documentation on-site within this Plan. The permittee must retain documentation for a 3-year period following permit expirations or termination. A copy of the Corrective Action Report is attached in Appendix D.

Page | 20

7. PLAN REVIEW AND AMENDMENT

Atlas recommends that this Plan be reviewed at least annually by the Stormwater Pollution Prevention Team to verify that it represents current facility conditions and complies with current regulations. During this review, the Town of Simsbury should check with a qualified environmental consultant or the CTDEEP to verify that the most current governing regulations are incorporated.

The Town will amend this Plan within 120 days whenever the Site experiences any of the following conditions:

a substantial change which has a significant effect on the discharge, or potential for discharge, of pollutants in stormwater from the Site;

an inspection, investigation or monitoring event which shows that the SWPPP is not effectively controlling or eliminating pollutants in stormwater discharges;

a failure of the SWPPP to ensure or adequately protect against pollution of the waters of the state;

a request by the Commissioner of the CTDEEP to modify the SWPPP; or a notification that they are subject to requirements because the receiving water to which it discharges stormwater has been designated as impaired under Section 303(d) of the Clean Water Act and as identified in the most recent State of Connecticut Integrated Water Quality Report, or a TMDL has been established for the receiving water.

These amendments will be effective when re-certified by a Professional Engineer licensed to practice in Connecticut or a Certified Hazardous Materials Manager and will be recorded in the Revisions Log included in Appendix C.

Page | 21

8. IMPLEMENT ITEMS

The following recommendations have been made based on Atlas’s site inspection, an SWPPP review conducted by the certifying Professional Engineer

Table 6 – Implementation Items

Recommendations Completed

Date Initials

Develop and implement a policy for tank truck delivery drivers to complete the Oil Product Transfers inspection log each time diesel fuel/gasoline is delivered to the facility.

Review the SWPP Plan at least annually to verify that it represents current facility conditions and complies with current regulations.

FIGURE 1

SITE LOCUS

Site

290 Roberts Street, Suite 301 East Hartford, Connecticut 06108 860-282-9924

PROJECT NO. 2419023002

FIGURE 1 SCALE: NTS

DRAWN BY: DAW DATE: 6/2023 FILE: SITE VICINITY

REVIEWED BY: KLL

SOURCE: USGS Topographic Map, Tariffville, Quadrangle, 7.5 Minute Series, dated 2019.

Client: Town of Simsbury Site Address: 36 Drake Hill Road

Simsbury, Connecticut 06070

Figure 1- Site Locus Map

FIGURE 2

SITE PLAN

Lawn

Lawn

Lawn LawnLawn

Sludge Storage

Tank

Sludge Storage

Tank

Pump Chamber

#2

Main Electrical Service Building

Emergency Generator

SP

A1 A2

Sludge Processing/Office/Lab

Building

Propane Cage

Trench Drain

Unloading Area

Thickened Sludge Loading Area

A3

Pretreatment Building Influent

Pumping Building

Dumpsters

Septage Tanks

Septage

RCVG

Primary Clarifiers

Pump Chamber

Primary Anoxic and Aeration Tanks

Distribution Box #2

UV Disinfection

Secondary Clarifiers

Pole Barn

To Drake Hill Road

Dry Polymer Storage

Interior Trench Drain

B1

Cleaning and Maintenance Area

Weir

Storm Water Outfall 01

MH

MH

MH

MH

MH

MH

MH

MH

MH

MH

MH

MH

MH

MH

MH

Wooded

Wooded

Wooded

Wooded

Wooded

Grass

Grass

Grass

Grass

Access Road

DESIGNED BY:

DATE:SCALE:

DRAWN BY:

COMPUTER CADFILE :

APPROVED BY:CHECKED BY:

JOB NO.: FIGURE NO.:

TITLE:

CLIENT:

PROJECT:

CADFILE

ML

June 20231"=60'

ML

12419023001

KL

KL

36 Drake Hill Road Simsbury, CT

A1

A2

A3

B1

SP

MH

AutoCAD SHX Text

GRAPHIC SCALE:

AutoCAD SHX Text

WPCF SITE PLAN

AutoCAD SHX Text Town of Simsbury

AutoCAD SHX Text

SWPPP

AutoCAD SHX Text General Notes:

AutoCAD SHX Text plan should not be used for construction or

AutoCAD SHX Text depicted on this plan are approximate. This

AutoCAD SHX Text All locations, dimensions, and property lines

AutoCAD SHX Text land conveyance purposes.

AutoCAD SHX Text Legend

AutoCAD SHX Text Approximate Property Line

AutoCAD SHX Text measurements made by representatives of ECS.

AutoCAD SHX Text Horizontal, and vertical locations of wells, and

AutoCAD SHX Text selected site features determined through

AutoCAD SHX Text 290 Roberts Street, Suite 301 * East Hartford, CT 06108

AutoCAD SHX Text Phone: 860-282-9924 Fax: 737-207-8276

AutoCAD SHX Text 4,000-Gal Diesel AST

AutoCAD SHX Text 2,000-Gal Gasoline AST

AutoCAD SHX Text 2,000-Gal Diesel AST

AutoCAD SHX Text 55-Gal Waste Oil Drum

AutoCAD SHX Text Above-Ground Storage Tanks

AutoCAD SHX Text Catchbasin

AutoCAD SHX Text Flow Direction Indicator

AutoCAD SHX Text Spill Kit

AutoCAD SHX Text Storm Sewer Line

AutoCAD SHX Text Building

AutoCAD SHX Text Drainage Area 1

AutoCAD SHX Text Drainage Area 2

AutoCAD SHX Text Treeline

AutoCAD SHX Text Manhole

APPENDIX A

CERTIFICATIONS

Facility Management Approval

I certify under penalty of law that this document and all Appendices were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete.