Attachment 10 - HAFB Stormwater Pollution Prevention Plan (DRAFT).pdf

APPENDIX J

DRAFT

BASE WIDE STORMWATER POLLUTION PREVENTION

PLAN

HANSCOM AIR FORCE BASE

MS4 Permittee Owned Operations: Nine Facilities Base Wide

Contract No. GS-10F-0103N

Prepared for:

Hanscom Air Force Base 66 ABG/CEIE Concord, Massachusetts

Prepared by:

BB&E, Inc.

March 2020 ii

TABLE OF CONTENTS

1 INTRODUCTION

2 FACILITY DESCRIPTION AND CONTACT INFORMATION

2.1 Facility Information

2.2 Contact Information/Responsible Parties

2.3 Stormwater Pollution Prevention Team

2.4 Site Drainage

2.4.1 Receiving Waters and Impairments

2.5 Facility Descriptions

2.6 Site Map

2.7 Additional Base Features

3 POTENTIAL POLLUTANT SOURCES

3.1 Industrial Activity and Associated Pollutants

3.1.1 Auto Hobby Shop

3.1.2 Heavy Vehicle Repair Lot

3.1.3 Car Wash

3.1.4 CE Pole Barn and Contractor Storage Yard

3.1.5 Compost Yard

3.1.6 Salt Barn

3.1.7 Central Heating Plant Fuel Yard

3.1.8 Solid Waste Management

3.2 Vehicle and Equipment Inventory

3.3 Emergency and Spill Response Equipment

3.4 Allowable Non-Stormwater Discharges

3.5 List of Significant Spills or Leaks

4 STORMWATER CONTROL MEASURES

4.1 Minimize or Prevent Exposure

4.2 Good Housekeeping

4.3 Preventative Maintenance

4.4 Spill Prevention and Response

4.5 Structural Controls

4.6 Erosion and Sediment Controls

4.7 Management of Runoff

4.8 Maintenance of Pollution Control Measures

5 PLAN IMPLEMENTATION

5.1 Employee Training

ii

5.2 Facility Inspections

5.3 Non-Numeric Effluent Limitations

5.4 Water Quality Based Effluent Limitations and Discharges to Impaired Waters

5.5 Recordkeeping and Reporting

6 SWPPP REVISIONS

TABLES

Table 1 Impaired Waters Receiving Drainage from Hanscom AFB Table 2 OWSs located at SWPPP Facilities

FIGURES

Figure 1 Facility Locations Figure 2 Northeast Facilities Site Map Figure 3 West Facilities Site Map

ATTACHMENTS

Attachment 1 Documentation of Significant Spills or Leaks at SWPPP Facilities Attachment 2 Employee Training Form Attachment 3 Routine Inspection Form Attachment 4 SWPPP Revision Log iii

ABBREVIATIONS AND ACRONYMS

66 ABG/CEIE CE, Environmental Element 66 ABG/CEO CE Operations Flight 66 ABG/CEOH CE Heavy Repair 66 LRS Logistics Readiness Squadron AFB Air Force Base AFCEC Air Force Civil Engineer Center AFMC Air Force Material Command AST aboveground storage tank BB&E BB&E, Inc.

BCE Base Civil Engineer BMP Best Management Practice CE Civil Engineering HQ Headquarters HWCP Hazardous Waste Contingency Plan HWMP Hazardous Waste Management Plan ISWMP Integrated Solid Waste Management Plan L&GMP Landscape and Grounds Maintenance Plan MA Massachusetts MassDEP Massachusetts Department of Environmental Protection MCM Minimum Control Measure MIT/LL Massachusetts Institute of Technology/Lincoln Laboratories MSW Municipal Solid Waste MS4 Municipal Separate Storm Sewer System NPDES National Pollutant Discharge Elimination System NRC National Response Center O&M Operations and Maintenance OWS Oil/Water Separator PMP Pest Management Plan S&ICP Snow and Ice Control Plan SPCC Spill Prevention, Control, and Countermeasures SPRP Spill Prevention and Response Plan SWMP Stormwater Management Plan SWPPP Stormwater Pollution Prevention Plan TMDL Total Maximum Daily Load USAF United States Air Force USEPA United States Environmental Protection Agency VCO Vehicle Control Officer iv

CERTIFICATION STATEMENT

I certify under penalty of law that this document and all attachments 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. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.

Responsible Official Certification

Printed Name: _________________________________ Title: ______________________________

Signature: ____________________________________ Date: ______________________________

Stormwater Pollution Prevention Plan

Massachusetts 1 March 2020

1 INTRODUCTION

This Stormwater Pollution Prevention Plan (SWPPP) has been developed as an appendix to the SWMP, to meet the new Minimum Control Measures (MCMs) outlined in the 2016 General Permit for Stormwater Discharges from Small Municipal Separate Storm Sewer Systems in Massachusetts (2016 MA Small MS4 General Permit).

This SWPPP has been developed by BB&E on behalf of Hanscom AFB to address the requirements of the United States Environmental Protection Agency’s (USEPA’s) 2016 National Pollutant Discharge Elimination System (NPDES) General Permit for Stormwater Discharges from Small Municipal Separate Storm Sewer Systems (MS4) in Massachusetts (MA), hereafter referred to as the “2016 MA MS4 Permit”.

Under MCM 6, Good Housekeeping and Pollution Prevention for Permittee Owned Operations, the permittee is required, per Section 2.3.7.b of the 2016 MA MS4 Permit (page 50-54), to:

…develop and fully implement a SWPPP for each of the following permittee-owned or operated facilities: maintenance garages, public works yards, transfer stations, and other waste handling facilities where pollutants are exposed to stormwater as determined by the permittee.

The SWPPP shall contain the following elements:

1. Pollution Prevention Team

2. Description of the facilities and identification of potential pollutant sources

3. Identification of stormwater control measures

4. Management practices including: minimize or prevent exposure, good housekeeping, preventative maintenance, spill prevention and response, erosion and sediment control, management of runoff, management of salt storage piles or piles containing salt, employee training, and maintenance of control measures

5. Procedures for site inspections

The SWPPP accomplishes these requirements by:

Providing an inventory of facilities that have the potential to cause stormwater pollution, and identifying locations where potential pollutant materials are stored;

Describing how stormwater is managed at the Base, including: engineered storm drain system conveyance; on-site pretreatment, treatment and infiltration systems; and discharges to surface water directly from the site;

Reviewing activities that occur at each facility that represent a potential for stormwater pollution;

Describing the Best Management Practices (BMPs) that will be implemented at the facilities to reduce, eliminate and prevent the discharge of pollutants to stormwater;

Identifying the employees responsible for developing, implementing, maintaining, and revising, as necessary, this SWPPP;

Establishing a schedule and description of site inspections to be conducted at the facilities to determine if the SWPPP is effective in preventing the discharge of pollutants;

Serving as a tool for Hanscom AFB employees, including a place to maintain recordkeeping associated with these requirements.

A SWPPP does not need to be developed for a facility if the permittee has either developed a SWPPP or has received a No Exposure Certification for the discharge under the Multi-Sector General Permit, or the

Massachusetts 2 March 2020 discharge is authorized under another NPDES permit. The Hanscom AFB Aero Club has a SWPPP document in practice and the Vehicle Maintenance Building (Building 1642) has a No Exposure Certification.

Hanscom AFB identified nine facilities which have the potential to contribute to stormwater contamination.

A SWPPP was deemed necessary for the following facilities located within Hanscom AFB:

1. Auto Hobby Shop

2. Heavy Repair Vehicle Storage

3. Car Wash

4. CE Pole Barn

5. Contractor Storage Yard

6. Compost Yard

7. Salt Barn

8. Central Heating Plant Fuel Yard

9. Garbage and Recycling Center (Recyclables Management Area)

Massachusetts 3 March 2020

2 FACILITY DESCRIPTION AND CONTACT INFORMATION

2.1 Facility Information

Hanscom AFB is located approximately 20 miles northwest of Boston, Massachusetts, primarily within the historical town of Bedford, with portions extending into the adjoining towns of Lincoln, Concord, and Lexington. The Base provides services such as logistical support, security police, communications, and engineering.

The Aero Club has an individual NPDES permit and SWPPP, and the Vehicle Maintenance Garage (Building 1642) has a No Exposure Certificate. Excluding these two facilities, Hanscom AFB identified nine other facilities which have the potential to contribute to stormwater contamination. All facilities at Hanscom AFB are Federal Operators and discharge to the Hanscom AFB MS4. A description of each of the nine facilities within this SWPPP is included in Section 2.5. Figure 1 shows the general location of the nine facilities within Hanscom AFB.

Hanscom Family Housing is a privately owned and operated housing area that is exempt from the MS4 and not included in this SWPPP

2.2 Contact Information/Responsible Parties

The 66th Civil Engineering Division (CE), Installation Management Flight, Environmental Element (66 ABG/CEIE) has overall responsibility for implementing the SWMP. The Hanscom AFB Stormwater Coordinator will be the primary person responsible for the development and implementation of the SWPPP.

Spills and/or release of potential pollutants are reported and managed as discussed in the SPRP. Contact information for the Stormwater Coordinator, as well as additional Emergency Contacts are provided below.

Refer to the Hanscom AFB Spill Prevention and Response Plan (SPRP) for a complete Emergency Contact list.

Facility Owner:

Name: Hanscom Air Force Base

Address: 120 Grenier Street, Hanscom AFB, MA 01970-1910 Telephone Number: 781-225-2999

Email Address: 66.ABG.CEG.CMB@US.AF.MIL

Stormwater Coordinator:

Name: Scott Sheehan, 66 ABG/CEIE Telephone Number: 781-225-6144 Email Address: Scott.sheehan.1@us.af.mil

Emergency Contact(s):

Name: Senior Fire Officer in Charge (Emergency Coordinator) Telephone Number: 781-225-5599 Name: Base Civil Engineer (66 ABG/CE) (Alternate Emergency Coordinator) Telephone Number: 781-225-2999 Name: Hanscom AFB Fire Department

Massachusetts 4 March 2020

Telephone Number(s): 911 or 781-225-3330 Name: CE Installation Management Environmental Element (66 ABG/CEIE) Telephone Number: 781-225-6142

2.3 Stormwater Pollution Prevention Team

The personnel listed below are designated as members of the Storm Water Pollution Prevention Team for Hanscom AFB and will be revised as necessary. The team members, their titles, and individual responsibilities are provided in the table. The storm water pollution prevention team is responsible for the following:

Implementation of the policies and procedures presented in the SWPPP for the facilities and operations.

Conducting periodic reviews of policies and procedures to evaluate the effectiveness of the current

SWPPP.

Updating the SWPPP and related information whenever there is a significant physical change in a facility and/or a significant change in the operational procedures of a facility that could result in the discharge of toxic or hazardous pollutants to storm water or an increased risk of such discharge.

Maintaining records of required inspections, operations, materials use, etc. as required in the

SWPPP.

Staff Name/Title Individual Responsibilities

Scott E. Sheehan Environmental Engineer/ Stormwater Coordinator

Oversees stormwater management as described in the SWPPP;

coordinates all stages of SWPPP development, inspections, and implementation; coordinates employee training; performs stormwater monitoring and inspections; maintains all records and ensures reports are submitted when warranted.

Renata N. Welch Chief, Environmental Element

Oversees all environmental functions at Hanscom AFB.

Karole Kasuik Hazardous Waste Program Manager

Oversees Hanscom AFB Hazardous Waste Management Program.

Nicholas D. Deveau Environmental Management System Program Manager

Assists Stormwater Coordination with SWPPP responsibilities.

2.4 Site Drainage

The Hanscom AFB stormwater system discharges into the Shawsheen River in Bedford (designated Class B surface water used for drinking water) and the Kiln Brook in Lexington, which flows into the Shawsheen River. Stormwater runoff from the impervious surfaces at Hanscom AFB is directed to the stormwater drainage system and/ or stormwater BMPs before being discharged into the Shawsheen River. The stormwater system at Hanscom AFB includes approximately 660 catch basins and dozens of various stormwater BMPs. Routine inspection and maintenance of the catch basin structures and stormwater BMPs, including sediment removal, is conducted by CE servise contractors managed by the CE Operations Section

(66 ABG/CEO).

2.4.1 Receiving Waters and Impairments

The final point of discharge for stormwater from Hanscom AFB is the Shawsheen River. The Massachusetts Department of Environmental Protection (MassDEP) lists the Shawsheen River Headwater (Segment ID

Massachusetts 5 March 2020

MA83-08) in the Massachusetts Year 2016 Integrated List of Waters as impaired due to bacteria/pathogens with an approved Total Maximum Daily Load (TMDL). Additionally, Hanscom AFB is located within Bedford municipality, which is listed under Part 2.2.2.b of the 2016 MA MS4 Permit as containing waterbodies, or their tributaries, that are impaired due to phosphorus. Table 1 lists the impaired waters within the boundaries of Hanscom AFB and the associated TMDLs.

Table 1 – Impaired Waters Receiving Drainage from Hanscom AFB

Water Body Name ID Category Impairment(s) Associated Approved

TMDL

Shawsheen River MA83-08 5 Escherichia coli 2,587

Fecal Coliform 2,587 Oxygen, Dissolved Physical substrate habitat alterations

Category 5 Waters – impaired water bodies that require a TMDL.

“Approved TMDLs” are those that have been approved by EPA as of the date of issuance of the 2016 MS4 Permit.

The activities and material stored at the Hanscom AFB have the potential to affect these impairments. Good housekeeping practices, preventative maintenance, and BMPs implemented at Hanscom AFB are methods to limit potential negative impacts to stormwater. These practices are discussed in Section 4.0 of this

SWPPP.

2.5 Facility Descriptions

A site inspection associated with the development of this Base Wide SWPPP was completed on February 11, 2020. During the site inspection, information related to activities at the site, vehicles stored at the site, fueling operations, material storage, transport of oil and other materials, and spill history was gathered.

The Aero Club has a NPDES permit and SWPPP in place. The Vehicle Maintenance Garage (Building 1642) has a No Exposure Certificate. Hanscom AFB owned vehicles are stored in multiple locations across the Base and include pickup trucks, maintenance trucks, dump trucks, snowplows, utility vans, various lawn maintenance equipment, and tractors. Vehicles awaiting maintenance are stored on a paved lot adjacent to Building 1642. Vehicle maintenance is primarily performed in Building 1642. Due to the existing NPDES permit and SWPPP for the Aero Club and the No Exposure Certification for the Vehicle Maintenance Garage, these two facilities are excluded from this Base Wide SWPPP document. Hanscom AFB identified nine other facilities which have the potential to contribute to stormwater contamination. These nine facilities are described below.

Auto Hobby Shop

The Hobby Shop (Building 1608) contains five indoor vehicle bays where maintenance activities are performed on private vehicles. No maintenance occurs on vehicles outside of the building. Hazardous material in the form of used oil, solvents, oil filters, oily automotive components, and batteries are stored within the building. Materials are handled in accordance with the procedures outlined in the Hanscom AFB Hazardous Waste Management Plan (HWMP) and Hazardous Materials Operations Plan (HMPO). A copy of each is stored in the Auto Hobby Shop Office.

Exterior to the Auto Hobby Shop is a paved area where trailers, vacuum pumps, tires, and one roll-off dumpster are stored. Vehicle tents are utilized to store private vehicles under cover for the winter or vehicles undergoing repair. One 2,000-gallon aboveground storage tank (AST) containing heating oil is located on

Massachusetts 6 March 2020 the east side of the Auto Hobby Shop. The single-walled AST is contained within a closed-top steel dike and is located on a concrete pad.

One trench drain runs along the length of the Auto Hobby Shop and discharges to an oil/water separator (OWS) that is connected to the sanitary sewer. The OWS is periodically cleaned and pumped out by a service contractor. All oil/water waste generated is properly managed and disposed of by the contractor.

Stormwater runoff from the exterior paved area drains to three stormwater inlets which flow east and discharge into the Shawsheen River.

Heavy Repair Vehicle Storage

The Heavy Repair Vehicle Storage area is a small paved parking lot located along the west side of Building 1827 (Heavy Repair). Large multi-use ground and snow/ice maintenance trucks (i.e., dump trucks, snowplows, etc.) are parked in this area when not in use. Building 1827 is manned during normal operating hours. Any vehicle with a suspected leak and/or damage is stored indoors at Building 1827. Spill kits are located inside Building 1827.

Building 1827 provides indoor storage for small winter road deicing equipment, including salt spreaders, sanders, and snowplows. Small equipment maintenance and washing occurs within the building. Trench drains are present in the facility to diverge wash water to an OWS connected to the sanitary sewer. The OWS is periodically cleaned and pumped out by a service contractor. All oil/water waste generated is properly managed and disposed of by the contractor.

Stormwater runoff from the Heavy Repair Vehicle Storage lot drains to three stormwater inlets which flow north-northwest and discharge into the Shawsheen River.

Car Wash

Hanscom AFB operates a two-bay public Car Wash located at Building 1707. Both wash bays are equipped with a trench drain which does not allow wash water to flow beyond the confines of the Car Wash. The trench drain collects wash water from inside the Car Wash and conveys the discharges to the sanitary sewer via an OWS. No spill kits are present in the area.

The two trench drains capture wash water inside the wash bays, which then conveys wash waters to an OWS connected to the sanitary sewer. The OWSs are periodically cleaned and pumped out by a service contractor. All oil/water waste generated is properly managed and disposed of by the contractor.

Stormwater runoff from the exterior area is captured in a small vegetated area south of the Car Wash or flows north to one stormwater inlet which discharges into the Shawsheen River.

CE Pole Barn

The CE Pole Barn is a paved, open storage area that is broken down into 5 separately fenced storage areas.

The CE Pole Barn is located in the northeast section of Hanscom AFB. Materials stored at the CE Pole Barn include empty transformers stored in a bermed area; cleaned, decommissioned tanks; electrical components such as wiring, PVC piping, exterior lights and poles; water pipes; pumps; hydrants; valves;

grounds maintenance equipment including sand spreaders, salt spreaders, snow plow blades, snow removal equipment, seeding material and equipment, trailers, steel plates for road repair cover, trenchers, rebar, culvert pipes, perforated piping, fencing, road maintenance signage, brick and various concrete blocks, and

Massachusetts 7 March 2020 curbing. The fenced storage areas are locked when not in use. Located near the CE Pole Barn, but exterior to the fenced area, is a storage area for three portable generators. No spill kits are present in the area.

Stormwater runoff drains to thirteen stormwater inlets which flow north and discharge into the Shawsheen River.

Contractor Storage Yard

The Contractor Storage Yard is a paved, fenced, open storage area located immediately west of the Auto Hobby Shop for use by Hanscom AFB contractors. Materials stored at the Contractor Storage Yard include loose gravel and dirt, curbing, heavy equipment, PVC piping, maintenance signage, cones, and fencing. No spill kits are present in the area.

All stormwater runoff flows into two stormwater inlets located in the center of the Storage Yard which flow north and discharge into the Shawsheen River.

Compost Yard

The Compost Yard is located in the northeast portion of the Base and contains individual storage lots divided by concrete barriers. Stored within the storage lots are individual piles of dirt, sand, gravel, mulch, reclaimed asphalt, concrete, top soil, compost, and large wood clippings. Areas within the Compost Yard are either paved or consist of dirt floors.

The stormwater inlets present in Figure 2 were not located during the February 11, 2020 site inspection.

Erosion control is present in the form of concrete barriers along the north edge of the Compost Yard and a vegetated strip beyond the concrete barriers. Stormwater runoff appears to flow north on the north side of the Compost Yard, and south, into a wooded area, on the south side of the Compost Yard. Stormwater runoff flowing north is directed towards the concrete barriers which then direct stormwater runoff to the west, out of the Compost Yard along the entrance road, and directly into a stormwater inlet located where the Compost Yard entrance road meets the main road.

Salt Barn

Salt utilized for winter road maintenance activities is stored in the Salt Barn (Building 1847). The Salt Barn is fully enclosed and covered, with an open entryway for access by salt spreaders. No spill kits are present in the area.

No stormwater inlets are present in this area. Stormwater runoff generally flows north-northwest to a grass field, or northeast towards a vegetated ridge and into a ravine. Stormwater that has not infiltrated ultimately flows to the Shawsheen River.

Central Heating Plant Fuel Yard

Hanscom AFB owns and operates a Central Heating Plant (Building 1201), located on the southeast side of the Base, which supplies heat and cooling to Base facilities. The plant is a natural gas and No. 6 fuel oil powered heating plant. Two 235,000-gallon ASTs containing No. 6 fuel oil are located within a fenced in, sloped concrete-diked Fuel Yard east of the heating plant. The two fuel storage tanks are located in individual containment areas separated by a concrete berm. Refiling of the two fuel storage tanks occurs by tanker truck deliveries via offsite petroleum product contractors, primarily throughout the winter when

Massachusetts 8 March 2020 heating needs are high. Spill absorbent kits and drain protector seals are stored on the tank trucks for immediate access in the occurrence of a spill during refueling.

Material collected in the containment areas may be held in containment, directed to an OWS, or released to the stormwater drainage system. Oil collected in the OWS is pumped to a 1,000-gallon oily-water holding tank located in a concrete diked pad west of the fuel storage tanks. Stormwater released to the stormwater drainage system flows north and discharges into the Shawsheen River.

Garbage and Recycling Center (Recyclables Management Area)

All personnel working at Hanscom AFB are responsible for ensuring municipal solid waste (MSW) is properly disposed of in its correct container. General trash is to be disposed of in brown dumpsters and recyclable material is to be deposited in green dumpsters. MSW generated at Hanscom AFB is collected from dumpsters located around the Base by the MSW contractor. Appendix E of the Hanscom AFB Integrated Solid Waste Management Plan (ISWMP) contains a map of dumpster locations around the Base.

MSW is then collected from dumpsters and directly transported to the appropriate off-base landfill.

Recyclables generated by on-base military and civilian work centers are sorted according to type of material and consolidated in roll-off dumpsters at the Recyclables Management Area, located outside of the Solid Waste Transfer Facility (Building 1855). Recyclables are then transferred to the appropriate off-base recycling facility. Four roll-off dumpsters are located in the paved Recyclables Management Area. Two roll-off dumpsters are stored under a covered area to minimize storm water contact. Two uncovered roll-off dumpsters were observed during the site visit to contain office furniture and other various office recyclables, or miscellaneous wastes that have been sorted out of recycled material. With the exception of occasional wastes that may be sorted out from recycled materials, no landfill wastes or industrial wastes (i.e., wastes contaminated with oil or other pollutants) are stored in the roll-off dumpsters. No spill kits are located in the area.

A trench drain runs across the paved dumpster storage area and collects the majority of stormwater runoff.

The trench drain is connected directly to the sanitary sewer system. It should be noted that Hanscom AFB plans to remove the trench drain in the future to allow for normal stormwater flow in this area.

2.6 Site Map

The site map for the CE Pole Barn, Heavy Repair Vehicle Storage Lot, Central Heating Plant, Compost Yard, Salt Barn, and Garbage and Recycling Center can be found on Figure 2. The site map for the Car Wash, Contractor Storage Yard, and Auto Hobby Shop can be found on Figure 3.

The site map includes:

Location of facilities where associated activities are exposed to precipitation.

The location and extent of pervious and impervious surfaces within the drainage area.

Approximate drainage area boundaries for each facility.

Direction of stormwater flow.

Location of receiving MS4 in the immediate vicinity of the facility.

Locations of all stormwater inlets and outfalls.

2.7 Additional Base Features

Aboveground Storage Tanks

Massachusetts 9 March 2020

ASTs at Hanscom AFB are utilized for utilities and fleet support including building heating, steam generation, and fuel and oil storage for various pieces of mobile equipment. ASTs are used for storage of various materials, including diesel, fuel oil, motor oil, and hydraulic/transmission fluid. A complete list of ASTs is provided in Table A, Appendix 1 to Annex A of the Hanscom AFB SPRP. Monthly inspections are performed using the monthly inspection form located in Appendix 1 to Annex D of the Hanscom AFB SPRP. Annual inspections are performed according to the annual inspection form located in Appendix 2 to Annex D of the Hanscom AFB SPRP.

Under federal regulations 40 CFR Part 112 (and Amendments), a Spill Prevention, Control, and Countermeasure (SPCC) Plan is required when a facility has an aboveground oil storage capacity greater than 1,320 gallons, when including containers with a capacity of 55 gallons or more. The Auto Hobby Shop and Central Heating Plant both have aboveground oil storage capacity greater than 1,320 gallons and are subject to 40 CFR Part 112. Spill prevention and response procedures associated with these tanks are covered by the Hanscom AFB SPRP.

Emergency Generators

Hanscom AFB utilizes diesel-fueled emergency generators located at strategic locations across the Base to supply backup power during outages. Diesel tanks for the generators are either part of the supporting base structure of the generator unit, or a stand-alone tank connected to the generator. Emergency generators are typically double-walled and located on concrete pads. Diesel fuel for emergency generator ASTs are filled by 66 Logistics Readiness Squadron (LRS). A complete list of emergency generators is included in Table A, Appendix 1 to Annex A of the Hanscom AFB SPRP.

Transformers

Oil-filled transformers are maintained at various locations throughout Hanscom AFB. A complete listing of oil-filled transformers is provided in Table C, Appendix 1 to Annex A of the Hanscom AFB SPRP.

Transformers described in the Hanscom AFB SPRP are not routinely filled, however, transformer dielectric fluids may be changed out or topped off. Refilling operations are typically completed with a pump that is controlled directly by the operator. Due to the infrequency of filling transformers, there is limited risk associated with oil releases while transferring oil into transformers. Any spills that do occur will be reported.

Monthly inspections are performed using the monthly inspection form located in Appendix 4 to Annex D of the Hanscom AFB SPRP.

Additionally, Massachusetts Institute of Technology (MIT)/Lincoln Laboratories (LL) has a support agreement with Hanscom AFB and manages transformers associated with their program activities within the confines of Hanscom AFB. Spill prevention and response procedures associated with these transformers are covered by the SPCC Plan for MIT/LL, Lexington, Massachusetts. Because these countermeasures and spill response procedures are different than those of HAFB, personnel should refer to the MIT/LL SPCC plan for specific instructions.

Oil/Water Separators

Hanscom AFB maintains OWSs located throughout the Base. The OWSs are designed to remove significant quantities of oil and floatables contained in water/liquid discharge. The captured oil is stored in holding tanks and is recovered for disposal by private contractors on a routine basis to ensure their proper working order.

Massachusetts 10 March 2020

The OWSs at Hanscom AFB are subject to EPA (40 CFR §280) and Massachusetts (310 CMR 80.00) OWS requirements. As such, the underground OWSs are not subject to SPCC requirements, with the exception of identifying their locations at the facility. A complete listing of the OWSs is provided in Table A, Appendix 4 to Annex A of the Hanscom AFB SPRP. A list of OWSs present at the facilities included in this Base Wide SWPPP are summarized below.

Table 2 – OWS located at SWPPP Facilities

Location Total

Capacity (gal) Oil Capacity

(gal) Contents Source

Mode of Discharge

Building 1201 (Central Steam Plant)

1,000 Unknown No. 6 Fuel Oil, water Tank Berms Storm Drain

Building 1608 (Auto Hobby Shop)

1,000 Unknown Wash water Wash Racks Sanitary Sewer

Building 1707 (Car Wash)

3,300 3,000 Oil, water, sludge, possibly waste oils

Car wash system

Sanitary Sewer

Building 1855 (Garbage and Recycling Facility) 1,500 1,000 Stormwater

Paved area runoff

Sanitary Sewer

Snow Disposal

Snow and ice removal operations are conducted during winter months when snow and ice may accumulate.

The Hanscom AFB Snow and Ice Control Plan (S&ICP) provides instruction and information on how Hanscom AFB will conduct snow and ice removal operations during winter months. Snow is stored at multiple stockpile storage areas that are maintained according to procedures outlined in Section 3.2.8, Annex C to Appendix B of the Hanscom AFB S&ICP. To the greatest extent possible, stockpiles are located away from waterbodies. The locations of the snow stockpile areas are identified in Appendix 1, Annex B of the S&ICP. To avoid contamination of stormwater, storage sites are prepared before the snow season begins..

Use or Storage of Pesticides, Herbicides, and Fertilizers

Grounds and building maintenance crews occasionally use pesticides and herbicides in routine operations for pest management. Care should be taken to properly store, handle, and apply these chemicals in the same manner as other hazardous materials, and only adequately trained staff should be responsible for their use.

To avoid contamination of stormwater during application, all products are applied in strict accordance with the manufacturer’s instructions and with local regulations.

Pesticides are stored indoors at the CE Entomology Shop (Building 1823) and at the Patriot Golf Course pesticide storage facility. Storage areas are inspected annually. In the event that a spill or leak occurs, storage areas and vehicles transporting pesticides, herbicides, and fertilizers are equipped with a spill response kit. Section 6 of the Hanscom AFB Pest Management Plan (PMP) includes procedures that have been developed to address the application, storage, and disposal of pesticides and herbicides. Fertilizer application occurs on an as needed basis in the spring and autumn months. Detailed procedures for fertilizer use and application are included in Section 3.1.4, Annex A of the Hanscom AFB Landscape and Grounds Maintenance Plan (L&GMP).

Massachusetts 11 March 2020

3 POTENTIAL POLLUTANT SOURCES

3.1 Industrial Activity and Associated Pollutants

The following sections describe the industrial activities that occur at the nine facilities included within this Base Wide SWPPP, including the potential pollutant sources associated with each, as well as pollution prevention control measures taken to minimize the exposure of potential pollutants to stormwater.

3.1.1 Auto Hobby Shop

Potential Sources of Stormwater Pollution

Vehicle maintenance activities often require the use of harmful liquids such as fuels, oils, and lubricants, and miscellaneous products associated with maintenance activities, which represent potential pollutants.

Storage of vehicles outside the Hobby Shop presents the possibility of stormwater contamination from fuel leaks.

Pollution Prevention Control Measures

The Auto Hobby Shop (Building 1608) is equipped with a trench drain that runs the length of the building and prevents wash water or other spilled material from exiting the maintenance area and reaching the stormwater drainage system. Liquid material collected by the trench drain is discharged to the sanitary sewer system via an OWS. The OWS is periodically cleaned and pumped out by a service contractor. All oil/water waste generated is properly managed and disposed of by the contractor.

Vehicle maintenance is performed indoors. No outdoor vehicle maintenance may take place at Hanscom AFB; therefore, pollutants associated with maintenance activities have minimal potential to impact stormwater. Vehicles, mechanical parts, and equipment that may yield small amounts of contaminants (e.g., oil or grease) are stored indoors or under vehicle tent covers. Good housekeeping measures are used to prevent or reduce the discharge of pollutants to stormwater from vehicle and equipment maintenance activities. Drip pans and absorbent materials are used in potential problem areas. Spill kits are kept on-site, near locations where spills may occur. Routine inspections of vehicles stored outside are performed to proactively identify maintenance needs or potential leaks.

3.1.2 Heavy Vehicle Repair Lot

Vehicle and equipment storage activities are a potential source of pollution due to the diesel fuel, gasoline, oil, hydraulic fluid, antifreeze and similar hazardous material stored within the machinery. Equipment maintenance activities (performed with Building 1827) often require the use of harmful liquids such as fuels, oils, and lubricants, wash products, and miscellaneous products associated with maintenance activities, which represent potential pollutants.

Pollution Prevention Control Measures

Vehicles are stored and parked on impervious surfaces or under cover or indoors whenever a leak is identified. Vehicles with fluid leaks shall be stored inside and under cover, or containment shall be provided until repairs are complete. Vehicles and equipment are maintained in good condition to minimize the potential for fluid leaks and are kept clean so that a buildup of polluting material (e.g., oil and grease) will

Massachusetts 12 March 2020 not wash away when exposed to rain. Spill kits are kept on-site, near locations where spills may occur.

Good housekeeping measures implemented to minimize the potential for stormwater pollution includes regular sweeping to ensure parking areas are free of sediment and debris. Routine inspections are performed to ensure vehicle and equipment storage areas are free of leaks.

Equipment maintenance is performed indoors. No outdoor vehicle maintenance may take place at Hanscom AFB; therefore, pollutants associated with maintenance activities have minimal potential to impact stormwater. The Heavy Repair Building is equipped with a floor drain and OWS to capture potential fuel spills or leaks. The OWS discharges to sanitary. The OWS is periodically cleaned and pumped out by a service contractor. All oil/water waste generated is properly managed and disposed of by the contractor.

3.1.3 Car Wash

Vehicle washing activities are a potential source of pollution not only from petroleum products and pollutants deposited on the exterior of the vehicles, but also from nutrients and sediment being washed into water bodies from the act of washing itself.

Pollution Prevention Control Measures

Vehicles are washed inside the car wash bays to reduce runoff to the stormwater system. Biodegradable, environmentally friendly detergents are used. Wash water is collected by a trench drain which does not allow wash water to flow beyond the confines of the wash area. The trench drain conveys wash water to the sanitary sewer system via an OWS. The OWS is periodically cleaned and vacuumed out by a contractor.

Because washing is conducted indoor, there is minimal potential for storm water pollution associated with the activity.

3.1.4 CE Pole Barn and Contractor Storage Yard

Storage yards are a potential source of pollution due to the outdoor storage of material and equipment that may have residual pollutants on the exterior of the equipment or may have residual oil/fuel within storage tanks. Additionally, improper storage of loose material (gravel, sand, etc.) or liquid materials may result in a spill that has the possibility to migrate to stormwater drains.

Pollution Prevention Control Measures

Equipment should only be stored within storage yard if it is clean and free of oily residue. Materials that have the potential to contribute to stormwater contaminants must be stored and handled indoors, under a covered area, and/or within a bermed area located away from drain inlets. Any spills that occur within the storage yards should be immediately cleaned up and reported in accordance with the SPRP. . Good housekeeping measures are implemented to minimize the potential for stormwater pollution from materials stored in storage yards. Material and equipment are maintained in good condition. Regular sweeping is performed to ensure there is no excess trash/debris or material accumulation. Routine inspections are performed to ensure material storage areas are free of spilled material.

As a BMP, spill kits should be placed in the storage yards for use in the event of spills.

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3.1.5 Compost Yard

Compost production and storage locations present the threat to contaminate stormwater with pathogens (bacteria and viruses), nutrients (phosphorous and nitrogen), fertilizers, pesticides, and sediment.

Pollution Prevention Control Measures

The Compost Yard is semi-contained by concrete barriers and fencing. A vegetated strip to the north of the Compost Yard serves as a barrier between the stored material and several stormwater drains. On the south side of the Compost Yard stormwater flows into a wooded area away from stormwater drains. No stormwater inlets were observed within the Compost Yard. Stormwater discharge from the northwest side of the Compost Yard was observed to contain sediment and was discharging to a stormwater drain at the intersection of the Compost Yard entrance road and cross street. Good housekeeping measures are implemented to maintain neat, separate compost piles, and to prevent excess sediment or material accumulation in order to prevent or reduce the discharge of pollutants from the area.

Adequate erosion and sedimentation controls (i.e., containment with berms, dikes, etc.) should be increased to prevent the discharge of pollutants from the Compost Yard, particularly in the northwest section where sediment is traveling along the entrance road into a stormwater drain.

3.1.6 Salt Barn

Salt is stored in the Salt Barn in piles for use during winter plowing and deicing operations. Salt represents a potential major contributor to stormwater pollution when stored unprotected outdoors and during salt delivery and loading activities if the material is not handled properly.

Pollution Prevention Control Measures

Salt piles are stored in an enclosed, covered storage shed (Building 1847) to prevent exposure to precipitation. Under no circumstances is salt be stored outside and/or exposed to precipitation; therefore, minimal potential for stormwater pollution is present. During delivery/loading activities, salt is transferred to and from vehicles within the Salt Barn, whenever possible. Any spills that occur during delivery/loading events should be immediately cleaned up. Good housekeeping measures implemented to minimize the potential for stormwater pollution includes regular sweeping of the salt storage area to prevent salt accumulation. The area should never be hosed down as a cleaning method.

3.1.7 Central Heating Plant Fuel Yard

Fuel spills during product transfer operations or tank failure represent a potential major contributor to stormwater pollution.

Pollution Prevention Control Measures

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Concrete diking and berms provide containment of possible spills and prevent material from entering the stormwater system. Stormwater release valves are present in the diked area and remain locked. The valves may only be opened after a stormwater team member inspects the contents of the diked area and deems that no contamination is present. Spill absorbent kits and drain protector seals are also stored on the tank trucks for immediate access in the occurrence of a spill during fuel transfer. Drain protector safety seals are also placed over stormwater drains, grates, and manholes to prevent migration of oil into the stormwater system during fuel transfer. Appropriate tank inspections are contracted and performed by qualified service providers.

3.1.8 Solid Waste Management

Solid waste production and storage locations present the threat to contaminate stormwater with pathogens, nutrients, metals, and sediments. Solid waste may be classified as both hazardous and non-hazardous waste consisting of agricultural, construction and demolition, industrial, and municipal.

A variety of wastes are generated and managed at Hanscom AFB, including sanitary waste, solid waste, wash waters, and waste oil products associated with vehicle and equipment maintenance. Waste management practices associated with these wastes are described below:

Lavatory waste is discharged to the sanitary sewer system.

Vehicle and equipment washing occurs indoors. Wash waters associated with the cleaning of vehicles and equipment are captured by trench drains inside the wash areas, which then conveys the wash waters to an OWS. The OWSs are connected to the sanitary sewer system. Wastes are managed by contractor.

Solid waste generated at Hanscom AFB is collected in dumpsters. A recycling dumpster is co-located with trash dumpsters at or near each building. MSW is collected from dumpsters by the MSW contractor and transported to the appropriate off-base landfill. Recyclables collected by the MSW contractor are loaded into roll-off dumpsters located outside of the Solid Waste Transfer Facility (Building 1855) and are properly recycled at the appropriate recycling facility according to material.

Waste oil and other miscellaneous waste materials (e.g., used oil, waste oil filters) are generated and stored inside various facilities, including the Auto Hobby Shop (Building 1608). Containers are properly labeled. Hanscom AFB personnel dispose waste materials, when drums and containers become full, in accordance with applicable state and federal regulations. Product transfer occurs indoors and waste oil and other materials are therefore not exposed to stormwater.

Pollution Prevention Control Measures

Garbage dumpster and container lids must be kept closed at all times unless adding or removing material.

Good housekeeping measures are used to minimize exposure of polluting materials to stormwater.

Appropriate staff shall be properly trained in correct solid waste management practices, including waste disposal and spill prevention and response. Preventative maintenance procedures include:

Each waste storage location shall be properly labeled, and all significant sources of pollution shall be kept in a secure, covered and contained area.

All waste storage containers and waste handling equipment shall be routinely inspected for signs of spills, leaks, corrosion or general deterioration.

Regular sweeping is performed to ensure there is no excess trash/debris or material accumulation in the area.

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Covered dumpsters should be provided to reduce contact with rainwater.

Spill response materials shall be properly maintained.

Hazardous waste accumulation points are inspected weekly by the assigned point of contact.

Spill kits are inspected on a quarterly basis, or after a spill is reported.

Detailed procedures for handling various wastes are included in the Hanscom AFB Hazardous Materials Operation Plan (HMOP) and ISWMP.

Routine visual inspection of storage and use areas is critical. The visual inspection process shall include identification of containers or equipment which could malfunction and cause leaks or spills. The equipment and containers shall be inspected for spills, leaks, corrosion, and general deterioration. In the case a defect is found, immediately repair or replace.

3.2 Vehicle and Equipment Inventory

An inventory of all Hanscom AFB maintenance vehicles has been developed and is maintained by the CE Vehicle Control Officer (VCO). The inventory is reviewed annually and updated as necessary. Vehicle information including recalls, maintenance, mileage, and other records are maintained by the VCO.

3.3 Emergency and Spill Response Equipment

Spill kits that contain absorbent material, booms, and other portable barriers are located inside various maintenance shops and are stored near oil storage areas. The spill kits are located in close proximity to oil storage areas for rapid deployment should a spill occur. Oil tank trucks are also equipped with portable spill kits at all times. Spill response materials and equipment are maintained by the Base Fire Department and 66 ABG/CEIE. Refer to Tab A, Appendix 2 to Annex C of the SPRP for a list of emergency response equipment and locations. Spill kits are inspected on a quarterly basis, or after a spill is reported.

It is recommended that spill kits be located in each area where stormwater may be exposed to potential polluting material, including Compost Yard and Contractor Storage Yard.

3.4 Allowable Non-Stormwater Discharges

Non-stormwater discharge is defined as any discharge or flow to the engineered storm drain system that is not composed entirely of stormwater runoff. The following categories of non-stormwater discharges are allowed under the 2016 MA MS4 Permit unless the permittee, EPA, or the MassDEP identifies any category or individual discharge of non-stormwater discharge as a significant contributor of pollutants to the MS4.

a. Water line flushing

b. Landscape irrigation

c. Diverted stream flows

d. Rising ground water

e. Uncontaminated ground water infiltration (as defined at 40 CFR § 35.2005(20))

f. Uncontaminated pumped ground water

g. Discharge from potable water sources

h. Foundation drains

i. Air conditioning condensation

j. Irrigation water, springs

k. Water from crawl space pumps

l. Footing drains

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m. Lawn watering

n. Individual resident car washing

o. Flows from riparian habitats and wetlands

p. De-chlorinated swimming pool discharges

q. Street wash waters

r. Residential building wash waters without detergents

Discharges or flows from firefighting activities are allowed under this permit and need only be addressed where they are identified as significant sources of pollutants to waters of the United States.

3.5 List of Significant Spills or Leaks

Hanscom AFB maintains records on the type, quantity, and location of all spills, leaks, and/or releases of hazardous and polluting material. Forms included in Attachment 1 will be used to document detailed information of any spill or release of hazardous material or potential pollutants. Records of significant spills or leaks will also be maintained in Attachment 1.

A summary of historical spills is located in Tab A, Appendix 2 to Annex B of the SPRP.

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4 STORMWATER CONTROL MEASURES

Structural and non-structural BMPs that are in place to control potential stormwater pollution are described in this section.

4.1 Minimize or Prevent Exposure

Exposure of materials and industrial activities to stormwater runoff must be minimized to reduce the amount of pollutants exposed to stormwater runoff. The following general control measures are implemented:

Equipment and maintenance activities are performed indoors to the greatest extent possible.

Vehicles and equipment stored outdoors will be located on paved areas.

Leaking vehicles and equipment needing repair will be stored indoors or will be parked within a bermed area.

Cleaning and washing of equipment and vehicles should be performed indoors when possible. If not possible, activities should be performed under cover, or in bermed areas that prevent runoff and run-on to the area.

Grading, berms, or curbing will be used to prevent runoff of contaminated flows and divert run-on away from storage areas.

Locate materials, equipment, and activities so that potential leaks and spills are contained or able to be contained or diverted before discharge.

Use spill/overflow protection equipment.

4.2 Good Housekeeping

Good housekeeping practices are activities, often practiced daily or weekly, that help maintain a clean facility and prevent stormwater pollution problems. Good housekeeping practices must be implemented at all exposed areas that are potential sources of pollutants in order to minimize pollutant discharges. General housekeeping practices include, but are not limited to:

Maintain dry and clean floors and pavement associated with the facility with the use of brooms, absorbents, cleaning machines, and…