STATE OF MAINE 

DEPARTMENT OF ENVIRONMENTAL PROTECTION 

Maine Pollutant Discharge Elimination System 

Multi-Sector General Permit 

Stormwater Discharge Associated 

With Industrial Activity 

 

 

 

 

Bureau of Land and Water Quality April 26, 2011 

Waste Discharge License # W-008227-5Y-B-R 

2011 MSGP 

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Table of Contents 

 Page 

Part I - General Coverage Under This Permit......................................................1 

 A. Permit Coverage.....................................................................................1 

 B. Eligibility................................................................................................1 

 C. Multiple Sector-Specific Industrial Activities........................................2 

 D. Allowable Non-stormwater Discharges ................................................2 

 E. Limitations on Coverage ........................................................................3 

 F. Authorization ..........................................................................................4 

 G. Public Posting of NOIs ..........................................................................5 

 H. No Exposure Certification .....................................................................5 

 I. New Ownership of a Permitted Facility ................................................5 

 J. Termination of Coverage........................................................................5 

 K. Authority for General Permit .................................................................5 

Part II - Limitations On Discharges To Impaired Waters...................................6 

 A. New Discharges to Impaired Waters ....................................................6 

 B. Existing Discharges to Impaired Waters...............................................6 

 C. Watershed Management Plan Compliance ...........................................6 

Part III - Permit Conditions....................................................................................6 

 A. Stormwater Pollution Prevention Plan (SWPPP)...................................6 

 B. Monitoring Requirements ......................................................................6 

 C. Numeric Effluent Limitations Based on Effluent Guidelines ................7 

 D. Reporting................................................................................................7 

 E. Retention of Records ..............................................................................8 

 F. Accessibility ...........................................................................................8 

Part IV - Notice Of Intent Requirements ..............................................................9 

 A. Notice of Intent (NOI)............................................................................9 

 B. Processing of NOI ..................................................................................9 

 C. NOI Submissions ...................................................................................9 

 D. NOI Contents .........................................................................................9 

 E. Where to Submit.....................................................................................10 

 F. Deficient NOI .........................................................................................10 

Part V - Stormwater Pollution Prevention Plan Requirements ..........................10 

 A. Stormwater Pollution Prevention Plan (SWPPP) Preparation ...............10 

 B. Control Measures ...................................................................................10 

 C. Non-Numeric Technology Based Effluent Limits .................................10 

 D. SWPPP Contents....................................................................................11 

 E. Maintenance ...........................................................................................17 

 F. Allowable Non-Stormwater Discharges.................................................17 

 G. Applicable State or Local Plans.............................................................17 

 H. Monitoring Frequency and Procedure Documentation..........................17 
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 I. Site Compliance Evaluations and Follow-up Corrective Actions...........18 

 J. SWPPP Documentation Requirements ...................................................20 

 K. Requirement to Maintain Updated SWPPP ...........................................21 

 L. Department Review................................................................................22 

 M. Signature, SWPPP Review and SWPPP Availability ...........................22 

 N. Additional Requirements for SARA Title III Facilities.........................22 

 O. Salt Storage Pile Requirements..............................................................22 

Part VI - Monitoring Requirements.......................................................................22 

 A. Monitoring Requirements and Limitations............................................22 

 B. Quarterly Visual Monitoring..................................................................23 

 C. Coal Pile Runoff Monitoring..................................................................23 

 D. Impaired Waters Monitoring and Corrective Actions............................24 

 E. Monitoring Procedures for Discharges to Impaired Waters...................25 

 F. Numeric Effluent Limitation Monitoring ...............................................26 

 G. Benchmark Monitoring Requirements...................................................26 

 H. Monitoring Schedule..............................................................................28 

 I. Representative Outfalls............................................................................28 

 J. Monitoring Exceptions............................................................................28 

 K. Adverse Weather Conditions .................................................................28 

Part VII - Sector-Specific Requirements For Industrial Activity...................29 

Part VIII - General Requirements .........................................................................29 

 A. Duty to Comply......................................................................................29 

 B. Continuation of the Expired General Permit..........................................29 

 C. Duty to Reapply .....................................................................................29 

 D. Other applicable conditions ...................................................................29 

 E. Signatory Requirements .........................................................................29 

 F. Oil and Hazardous Substances Liability.................................................30 

 G. Release in Excess of Reportable Quantities...........................................30 

 H. Severability ............................................................................................30 

 I. Transfer of Permit....................................................................................30 

 J. State Laws ...............................................................................................30 

 K. Proper Operations and Maintenance .......................................................30 

 L. Monitoring and Records.........................................................................30 

 M. Bypass of Stormwater Control Facilities................................................31 

 N. Upset Conditions....................................................................................32 

 O. Inspection and Entry ..............................................................................33 

 P. Reopener.................................................................................................33 

 Q. Requiring an Individual Permit or an Alternative General Permit ........33 

 R. Availability of Reports...........................................................................33 

 S. Confidentiality of Information................................................................33 

 T. Right to Appeal.......................................................................................34 

 U. Notice Required .....................................................................................34 

 V. Effective Date of Coverage....................................................................34 

 W. Continuing Coverage .............................................................................34 
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 X. Transfer of Ownership ...........................................................................34 

 Y. General Restrictions...............................................................................34 

 Z. Sampling and Test Procedures ..............................................................35 

 AA. Monitoring Requirements .....................................................................35 

 AB. Removed Substances.............................................................................35 

Part IX - Definitions.................................................................................................35 

Table 2 - Sectors Of Industrial Activity Covered By This Permit ......................40 

Appendix A - Timber Products..................................................................................45 

Appendix B - Paper and Allied Products Manufacturing ..........................................49 

Appendix C - Chemical and Allied Products Manufacturing....................................52 

Appendix D - Asphalt Paving and Roofing Materials 

 and Lubricant Manufacturers..............................................................55 

Appendix E - Glass, Clay, Cement, Concrete and Gypsum Products .......................57 

Appendix F - Primary Metals ....................................................................................60 

Appendix G - Metal Mining (Ore Mining and Dressing)..........................................62 

Appendix H - Coal Mines and Coal Mining Related Facilities.................................67 

Appendix I - Oil and Gas Extraction and Refining....................................................70 

Appendix J - Mineral Mining and Dressing ..............................................................73 

Appendix K - Hazardous Waste Treatment, Storage or Disposal .............................76 

Appendix L - Landfills, Land Application Sites and Open Dumps...........................81 

Appendix M - Automobile Salvage Yards.................................................................86 

Appendix N - Scrap Recycling and Waste Recycling Facilities................................88 

Appendix O - Steam Electric Generating Facilities...................................................94 

Appendix P - Land Transportation and Warehousing ...............................................98 

Appendix Q - Water Transportation ..........................................................................101 

Appendix R - Ship and Boat Building or Repair Yards.............................................104 

Appendix S - Air Transportation ...............................................................................107 

Appendix T - Treatment Works.................................................................................111 
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Appendix U - Food and Kindred Products ................................................................113 

Appendix V - Textile Mills, Apparel and Other Fabric Products..............................115 

Appendix W - Furniture and Fixtures........................................................................117 

Appendix X - Printing and Publishing.......................................................................119 

Appendix Y - Rubber, Miscellaneous Plastic Products and 

 Miscellaneous Manufacturing Industries............................................121 

Appendix Z - Leather Tanning and Finishing............................................................123 

Appendix AA - Fabricated Metal Products ...............................................................125 

Appendix AB - Transportation Equipment, Industrial or Commercial Machinery...127 

Appendix AC - Electronic, Electrical Equipment and Components 

 Photographic and Optical Goods .....................................................130 

Appendix AD - Stormwater Designated by the Department as Requiring Permits...131 
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Part I. GENERAL COVERAGE UNDER THIS PERMIT 

A. Permit Coverage. This Multi-Sector General Permit (MSGP), hereinafter 

described as the General Permit, authorizes the direct discharge or point 

source discharge of stormwater associated with industrial activity to waters of 

the State other than groundwater or to a MS4 that discharges to waters of the 

State, provided that the discharge meets the requirements of this General 

Permit and applicable provisions of Maine’s waste discharge and water 

classification statutes and rules. 

This General Permit is effective April 26, 2011, and authorization to discharge 

under this General Permit expires April 25, 2016. The Department intends 

subsequent re-issuance of this Multi-Sector General Permit. This General 

Permit applies State-wide. This General Permit replaces Maine’s MSGP for 

Industrial Activity issued October 11, 2005. 

B. Eligibility. Except for stormwater discharges identified under Part (I)(E) 

Limitations on Coverage, this permit may cover the following new and 

existing discharges composed entirely of stormwater. 

1. Stormwater discharges associated with industrial activity, as defined in 

this General Permit, from the “Sectors” of industry activity based on 

Standard Industrial Classification (SIC) codes or Industrial Activity Codes 

as described in Table 2, and that are specifically identified by outfall or 

discharge location in the Stormwater Pollution Prevention Plan (SWPPP). 

References to “Sectors” in this General Permit (e.g., Sector-specific 

monitoring requirements,) refer to Sectors of industrial activity listed in 

Table 2 and Appendices A-AD. 

2. Discharges designated by the Department as requiring permit coverage 

pursuant to 40 CFR 122.26 (a)(1)(v). These discharges are described in 

Appendix AD of this General Permit. 

3. Stormwater discharges associated with industrial activity from facilities 

with existing effluent guideline limitations for stormwater under 40 CFR 

Subchapter N. The following activities are eligible for coverage under this 

General Permit: 

a. Runoff from material storage piles at cement manufacturing 

facilities [40 CFR Part 411 Subpart C (established February 23, 

1977)]; 

b. Contaminated runoff from phosphate fertilizer manufacturing 

facilities [40 CFR Part 418 Subpart A (established April 8, 1974)];

c. Coal pile runoff at steam electric generating facilities [40 CFR Part 

423 (established November 19, 1982)]; 

d. Discharges from spray down or intentional wetting of logs at wet 

deck areas [40 CFR Part 429 Subpart I (established January 26, 

1981)]; provided additional BMPs, such as a water use 
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management plan approved by the Department, is implemented for 

those facilities discharging to Class AA, A, GPA and to waters 

having a drainage area of less than 10 square miles as defined by 

Maine’s Water Classification Program, 38 M.R.S.A. §§ 464(4), 

465, and 465-A; 

e. Mine dewatering discharges at crushed stone mines [40 CFR Part 

436, Subpart B]; 

f. Mine dewatering discharges at construction sand and gravel mines 

[40 CFR Part 436, Subpart C]; 

g. Mine dewatering discharges at industrial sand mines [40 CFR Part 

436, Subpart D]; 

h. Runoff from asphalt emulsion facilities [40 CFR Part 443, Subpart 

A (established July 24, 1975)]; and 

i. Runoff from landfills [40 CFR Part 445, Subpart A and B 

(established February 2, 2000)]. 

C. Multiple Sector-Specific Industrial Activities. If a facility is engaged in more 

than one Sector-specific industrial activity as described in Table 2 and 

Appendices A-AD, the facility’s owner or operator shall comply with the 

Sector-specific requirements and conditions applicable to each industrial 

activity. Sector-specific requirements are applied only to those areas of the 

facility where each industrial activity occurs. Sector-specific monitoring 

requirements and effluent limitations are applied outfall by outfall. 

Where stormwater from multiple industrial activities mixes and is discharged 

in a single outfall, the monitoring requirements and effluent limitations are 

additional. The facility’s owner or operator is required to monitor the 

discharge for all requirements of all applicable Sectors of industrial activity 

which occur in the outfall’s drainage area. Where more than one effluent 

limitation for a specific parameter applies to a discharge, compliance with the 

more restrictive limitation is required 

If the facility’s owner or operator complies with all requirements applicable to 

each Sector-specific industrial activity, the discharges from these multiple 

Sector-specific activities are authorized under this General Permit. 

D. Allowable Non-Stormwater Discharges. This permit authorizes the following 

non-stormwater discharges provided that they do not cause or contribute to a 

violation of water quality standards as determined by the Department. 

Appropriate BMPs for these discharges must be addressed in the SWPPP to 

ensure limited impact on receiving waterbodies. 

1. Discharges from fire fighting activities; 

2. External building wash-down that does not use detergents; 

3. Lawn watering; 

4. Uncontaminated groundwater; 

5. Uncontaminated springs; 

6. Air conditioning condensate; 
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7. Irrigation drainage; 

8. Uncontaminated foundation or footing drains where flows are not 

contaminated with process materials such as solvents, or in contact with 

soils where spills or leaks of toxic or hazardous materials have occurred; 

9. Incidental windblown mist from cooling towers that collects on rooftops 

or adjacent portions of a facility, but not intentional discharges from a 

cooling tower (e.g., “piped” cooling tower blow-down or drains); 

10. Uncontaminated utility vault dewatering; and 

11. Hydrostatic test water that does not contain any treatment chemicals and is 

not contaminated with process chemicals. 

If any of the above non-stormwater discharges are present and may reasonably be 

expected to mix with stormwater discharges from an industrial activity, these 

conditions must be specifically identified and addressed in the facility's SWPPP. 

E. Limitations on Coverage: The following stormwater discharges are not 

authorized by this permit. If any of the following discharges or types of 

discharges mixes with an authorized stormwater discharge associated with 

industrial activity, the entire discharge is not eligible for coverage under this 

General Permit and not authorized by this General Permit. 

1. Stormwater discharges associated with industrial activity that is mixed 

with other discharges, unless the other discharge is authorized by a 

different Maine Pollutant Discharge Elimination System (MEPDES) 

permit; or the other discharge is identified in Part I(B)(3) of this permit; 

2. Stormwater discharges associated with industrial activity which require an 

individual waste discharge permit or require coverage under an alternative 

general permit. The Department may require any person with a discharge 

authorized by this General Permit to apply for and obtain an individual 

permit. Any interested person may petition the Department to take action 

under this paragraph. Examples of when an individual waste discharge 

permit may be required are specified in rule; 

3. A waste discharge permit may be required for activities such as combined 

sewer overflows (CSO(s)), spray irrigation, process water treatment 

systems, metallic mine drainage, and other discharges not covered by this 

General Permit; 

4. Stormwater discharges which the Department has found to be, or may 

reasonably be expected to be, contributing to a violation of a water quality 

standard or is a significant contributor of pollutants. This limitation on 

coverage does not apply if the permittee demonstrates participation and 

compliance with the implementation of a Department Approved 

Watershed Management Plan to restore water quality to the impaired 

waterbody. Proof of participation in the implementation of a Watershed 

Management Plan is required with the Notice of Intent (NOI) submittal. 
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NOTE: Part IX(H) of this General Permit, defines a Department Approved Watershed 

Management Plan as it pertains to the requirements of this General Permit. 

5. Stormwater discharges associated with industrial activity from facilities 

where any MEPDES permit has been denied or is in the process of being 

denied, terminated, or revoked by the Department (other than in a 

replacement permit issuance process), except that the Department may 

allow coverage under this General Permit if ownership or operation of the 

facility has changed to a different owner or operator and new 

circumstances at the facility justify allowing coverage; 

6. Stormwater discharges associated with construction activity disturbing one 

(1) acre or more, and where stormwater runoff discharges to the waters of 

the State, unless in conjunction with mining activities; 

7. New stormwater discharges that do not meet the applicable stormwater 

standards for stormwater quality as set forth in 06-096 CMR 500 

Stormwater Management. Changes in or expansion of a facility covered 

by this General Permit which result in one (1) acre or more of disturbed 

area or five (5) acres or more of developed area will require that the 

facility meet the applicable stormwater standards of 06-096 CMR 500; 

8. Stormwater discharges associated with industrial activity that may 

adversely affect a listed or a proposed to be listed, endangered or 

threatened species or its critical habitat; and 

F. Authorization. Coverage under this General Permit, or an individual waste 

discharge permit or alternative general permit, is required if a facility has a 

stormwater discharge associated with an industrial activity. An owner or 

operator of a stormwater discharge associated with industrial activity seeking 

coverage under this General Permit shall submit a NOI form to the 

Department by one of the following accepted methods: e-mail, US Postal 

Service (USPS), or by hand delivery, in accordance with the requirements of 

Part IV of this General Permit. Upon review of the NOI, the Department may 

accept or reject the authorization to discharge pursuant to the terms and 

conditions of this General Permit. If the NOI is denied, the owner or operator 

shall resubmit any Department–requested information or submit an 

application for an individual or an alternative general permit. The Department 

may deny coverage under this permit at any time and require submittal of an 

application for an individual or an alternative general permit. 

1. Granting Authorization to Existing Facilities. A permittee discharging 

stormwater associated with industrial activity authorized under Maine’s 

October 11, 2005, MSGP shall submit a completed NOI by no later than 

May 25, 2011. Unless notified by the Department to the contrary, a 

person who submits a NOI is authorized to discharge under the terms and 

conditions of this General Permit. A permittee shall modify the facility’s 

SWPPP to comply with the terms and conditions of this General Permit. 
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2. Granting Authorization to New Facilities. A stormwater discharge 

associated with industrial activity not authorized under Maine’s October 

11, 2005, MSGP shall submit a completed NOI no later than thirty (30) 

days after written notification by the Department. Unless notified by the 

Department to the contrary, a person who submits a NOI is authorized to 

discharge under the terms and conditions of this General Permit. 

G. Public Posting of NOIs. The Department shall post a list of all NOIs at: 

http://www.maine.gov/dep/blwq/docstand/stormwater/multisector/lists.htm. 

H. No Exposure Certification. Existing facilities that certified “no exposure” 

under Maine’s October 11, 2005, MSGP shall submit a new Maine MultiSector No Exposure Certification if still applicable on Department form 

DEPLW0968 for the Department’s review and approval by no later than May 

17, 2011. A facility qualifies for “no exposure” when all industrial activities 

and materials are protected by a storm resistant shelter designed to prevent 

exposure to stormwater, and the discharge satisfies the conditions at 40 CFR 

§122.26(g) and Appendix AE of this General Permit. Terminating a No 

Exposure Certification is addressed in Appendix AE. 

I. New Ownership of a Permitted Facility. If ownership of facility authorized 

under this General Permit changes, the new owner or operator shall submit a 

new NOI to gain authorization to discharge under this General Permit. 

J. Termination of Coverage. An owner or operator of a facility shall notify the 

Department, on Department form DEPLW0967, when the discharge(s) of 

stormwater associated with industrial activity no longer occurs at the facility, 

or if ownership of the facility or industrial activity changes. Upon verification 

of the status of the facility by the Department, coverage under this General 

Permit is then terminated. If a facility has a corporate name change but no 

change in owner, operator or activity, the facility must notify the Department 

of the name change but is not required to file a notice of termination (NOT). 

K. Authority for General Permit. A permit is required for the direct or indirect 

discharge of pollutants to the waters of the State. A general permit may be 

issued for point source stormwater discharges. A discharger of stormwater 

associated with industrial activity who fails to obtain coverage under this 

General Permit, an individual MEPDES permit or an alternative general 

permit and discharges stormwater to waters of the State or to a Municipal 

Separate Storm Sewer System (MS4) is in violation of Maine’s waste 

discharge and water quality laws and the Clean Water Act, and is subject to 

penalties under 38 M.R.S.A. § 349 and Section 309 of the Clean Water Act. 

A permittee under this General Permit who violates the terms and conditions 

of this General Permit is subject to enforcement by the Department for 

violation of this General Permit. Nothing in this General Permit is intended to 

limit the Department’s authority under the waste discharge and water 

classification statutes or rules. 
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Part II. LIMITATIONS ON DISCHARGES TO IMPAIRED WATERS 

A. New Discharges to Impaired Waters. A new discharge or discharger is not 

eligible for coverage under this General Permit to discharge to an “impaired 

water” as defined in Part IX(M) unless: 

1. All exposure of the pollutant(s) for which the waterbody is impaired is 

prevented, and procedures to prevent exposure are documented and 

retained on site with the SWPPP; or 

2. Documentation proving that the pollutant(s) for which the waterbody is 

impaired is not present in the facility’s discharge(s), or treatment of the 

pollutant is provided for in compliance with 06-096 CMR 500, and these 

findings are retained in the facility’s SWPPP. 

B. Existing Discharges to Impaired Waters. Discharges to impaired waters 

authorized under the 2005 MSGP must file a NOI under this General Permit 

and comply with Part VI(D) and (E) for monitoring and corrective actions. If 

a TMDL or the 303d list is modified after the effective date of this General 

Permit, the Department will notify the permittee of the change(s) and any 

additional monitoring requirements. The 303d and TMDL lists are available 

at: http://www.maine.gov/dep/blwq/docmonitoring/305b/index.htm

C. Watershed Management Plan Compliance. Participation in and compliance 

with the implementation of a Department Approved Watershed Management 

Plan as defined for this General Permit, that has a means of funding that is in 

effect meets the requirements of Part II of this General Permit. A copy of the 

agreement stating participation of the permittee in the Watershed Management 

Plan is required upon submittal of the NOI or upon the Department’s approval 

of the Watershed Management Plan. If a Watershed Management Plan is 

approved after a NOI is filed with the Department, a permittee must submit to 

the Department a copy of the agreement documenting participation in the 

implementation of the Watershed Management Plan to meet the impaired 

waters monitoring requirements under this General Permit. 

Part III. PERMIT CONDITIONS 

A. Stormwater Pollution Prevention Plan (SWPPP). Development of a SWPPP, 

as described in Part V of this General Permit, is required before submitting a 

NOI for authorization to discharge stormwater associated with industrial 

activity under this General Permit. If a facility has been implementing a 

SWPPP under Maine’s 2005 MSGP, the owner or operator shall review and 

update the SWPPP to implement all provisions of this General Permit prior to 

submitting a NOI. A copy of the SWPPP must be kept on site at all times to 

maintain permit coverage and to remain compliant with the MSGP. 

B. Monitoring Requirements. The owner or operator of the stormwater discharge 

associated with industrial activity shall comply with the monitoring 
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requirements and Sector-specific numeric limitations of Parts VI and VII of 

this General Permit. 

C. Numeric Effluent Limitations Based on Effluent Guidelines. Discharges from 

regulated activities subject to the effluent guidelines listed in Table 1 below 

are eligible for coverage under this General Permit provided the facility’s 

activity(ies) match the listed activity or SIC code(s) and meet effluent 

limitation guidelines established in federal regulations and Part VII of this 

General Permit. A regulated activity must meet the effluent limits and comply 

with the Sector requirements as noted in their corresponding Sector-specific 

Appendix. 

Table 1: Effluent Guidelines Applicable To Eligible Discharges For General Permit 

Coverage 

Regulated Activity New Source performance 

standards included in 

effluent guidelines 

Sectors 

affected

SIC or 

Activity 

Codes 

Runoff from material storage piles at cement 

manufacturing facilities (40 CFR Part 411 Subpart C 

[established February 23, 1977]) 

Yes E 3241 

Contaminated runoff from phosphate fertilizer 

manufacturing facilities (40 CFR Part 418 Subpart A 

[established April 8, 1974]) 

Yes C 2874 

Coal pile runoff at steam electric generating facilities 

(40 CFR Part 423 [established November 19, 1982]) 

Yes O SE 

Discharges resulting from spray down or intentional 

wetting of logs at wet deck storage areas (40 CFR 

Part 429, Subpart 1 [established January 26, 1981]) 

Yes A 2411 

Mine dewatering discharges at crushed stone mines 

(40 CFR part 436, Subpart B) 

No J 1422-

1429 

Mine dewatering discharges at construction sand and 

gravel mines (40 CFR part 436, Subpart C) 

No J 1442 

Mine dewatering discharges at industrial sand mines 

(40 CFR part 436, Subpart D) 

No J 1446 

Runoff from asphalt emulsion facilities (40 CFR part 

443, Subpart A [established July 24, 1975]) 

Yes D 2951, 

2952 

Runoff from landfills (40 CFR Part 445, Subpart A 

and B [established February 2, 2000]) 

Yes K & L HZ, LF 

D. Reporting. The minimum reporting requirements and deadlines for this 

General Permit are listed in this section. 

1. Annual Report. If the Department’s Industrial Stormwater inspector finds 

deficiencies in the development or implementation of any portion of the 

SWPPP, (including but not limited to a SWPPP that fails to identify an 

industrial activity, a discharge, or the permittee fails to conduct required 
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monitoring or implement a BMP set forth in the SWPPP) the permittee 

shall submit an updated SWPPP within thirty (30) days of written notice, 

and submit annual reports for the next three consecutive permit years, 

including subsequent permit reissuance. Annual reports must be 

submitted on Department form DEPLW1201 for the Department’s review 

and approval. This annual report must summarize the function of all 

BMPs, results of visual, benchmark, numeric and impaired waters 

monitoring, location of significant spills, quarterly site inspections, annual 

non-stormwater discharge certification results, and all implemented or 

planned corrective actions. The annual report must be submitted to the 

Department by May 9th of each permit year. An electronic version of this 

form is available at: 

http://www.maine.gov/dep/blwq/docstand/stormwater/multisector.htm#form 

2. Numeric Effluent Limitation Monitoring. Sectors C, D, E, K, L & O are 

subject to quarterly monitoring requirements. Numeric Monitoring 

schedules for Sectors A, B, & J are activity dependent and are outlined in 

each Sector. All monitoring results must be recorded in the SWPPP. If 

the average of the two quarterly monitoring samples exceeds the numeric 

limit for any parameter, the permittee shall submit the results to the 

Department within 14 days of receiving the results. Additional numeric 

monitoring and reporting requirements are outlined in Part VI(F). 

3. Impaired Waters and Benchmark Monitoring. Impaired Waters and 

Benchmark Monitoring requirements are outlined in Part VI(D), (E) and 

(G) respectively. A summary of these results must be maintained in the 

SWPPP. Benchmark Monitoring is required for Sectors A, B & N. Each 

Sector may be subject to separate or additional monitoring requirements. 

4. Visual Monitoring of Stormwater Discharges. All facilities must perform 

visual monitoring of stormwater discharges in accordance with Part VI of 

this General Permit, and maintain visual monitoring data in the SWPPP. 

E. Retention of Records. In addition to the requirements of Part VIII(L)(2) of 

this General Permit, the permittee shall retain copies of the SWPPP, all reports 

and certifications required by this General Permit, and records of all data used 

to complete the Notice of Intent to be covered by this General Permit, for a 

period of at least three (3) years from the date that the facility’s coverage 

under this General Permit expires or is terminated. The Department may 

extend the time of record retention at any time. 

F. Accessibility. The permittee shall make a copy of the SWPPP, including all 

monitoring, reporting, and Notice of Intent available to the public, if requested 

to do so in writing. 
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Part IV. NOTICE OF INTENT REQUIREMENTS 

A. Notice of Intent (NOI). By submitting a NOI, the applicant agrees to comply 

with the terms and conditions of this General Permit. A NOI must be 

submitted to the Department with the appropriate fee. Failure to submit 

proper payment will result in rejection of the NOI as incomplete. 

B. Processing of NOI. Prior to authorization of a stormwater discharge 

associated with industrial activity, a NOI must be reviewed and approved by 

the Department. The NOI is deemed approved thirty (30) calendar days after 

the Department receives the notification, unless the Department approves or 

denies the NOI prior to that date. If the applicant does not receive 

correspondence from the Department within the thirty (30) day period after 

the NOI submission, the applicant is authorized to carry out the activity. For 

existing permittees coverage under the 2005 MSGP is administratively 

continued, until coverage is granted under this General Permit, an alternative 

general permit, an individual permit or if coverage is otherwise terminated. 

C. NOI Submission. A person shall file the NOI on Department form 

DEPLW0953. A person shall sign the NOI in accordance with Part VIII(E). 

The NOI must contain all information listed in the General Permit. The NOI 

must be sent to the address indicated on the NOI form. A copy the initial NOI 

form shall be provided by the applicant to municipal office, town, or city, or 

the county commissioner in the case of an unorganized territory in which the 

discharge will occur at the time it is submitted to the department. Permittees 

covered under Maine’s 2005 MSGP have the option of submitting a NOI 

electronically to the Department, these NOI renewals may be submitted 

electronically to 2011renewal.DEP@maine.gov.

D. NOI Contents.

1. Site identification number (beginning with MER05) assigned to facility 

under Maine’s 2005 General Permit, if any; 

2. The facility’s legal business name and charter number if applicable (State 

of Maine) to determine Title, Right and Interest in the property/business; 

owner’s or operator’s/contact's name, address, telephone number; 

3. Facility/Site information including facility name, address and location, 

including the latitude and longitude of the facility if known; 

4. The name of the receiving water(s), (if known), or if the discharge is 

through a municipal separate storm sewer system (MS4), the name of the 

owner or operator of the MS4 and the ultimate receiving water(s), if 

known; 

5. The SIC or Activity Code(s) that best represents the industrial activity 

conducted at the facility; 

6. An identification of the applicable Sector(s); and 
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7. Additional information required by the Department as part of the NOI, to 

determine whether or not to authorize the discharge under this General 

Permit. 

E. Where to Submit. A completed and signed NOI, in accordance with Part 

VIII(E), must be submitted with the appropriate fee to: 

Maine Department of Environmental Protection 

Municipal and Industrial Stormwater Coordinator 

17 State House Station 

Augusta ME 04333-0017 

F. Deficient NOI. If any portion of the NOI does not meet one or more of the 

minimum requirements of this part, the applicant will be notified of the 

deficiency within the 30-day review period. It is the responsibility of the 

applicant to make all required changes and resubmit the NOI. The review 

period will begin when the revised NOI is received by the Department. 

Part V. STORMWATER POLLUTION PREVENTION PLAN REQUIREMENTS 

A. Stormwater Pollution Prevention Plan (SWPPP) Preparation. Each facility 

seeking coverage under this General Permit must prepare a SWPPP as 

described in Part III(A) prior to submitting a NOI for permit coverage. The 

SWPPP must be prepared in accordance with good engineering practices and 

identify potential pollutant sources which may reasonably be expected to 

affect the quality of stormwater discharges associated with industrial activity 

from the facility. The SWPPP must describe and ensure the implementation 

and maintenance of Best Management Practices (BMPs) and Control 

Measures as identified in this Part. Implementation of the SWPPP must 

reduce or eliminate polluted stormwater discharges associated with industrial 

activity, and assure compliance with this General Permit. 

B. Control Measures. The permittee shall select, design, install and implement 

control measures (including BMPs) to address potential pollutant sources and 

any discharge(s) associated with industrial activity. Control measures must be 

evaluated in conjunction with monitoring to meet the terms and conditions of 

this General Permit. The selection of these control measures must be in 

accordance with good engineering practices, and the requirements of each 

Sector. (See Appendix A–AD.) The SWPPP must fully describe these 

control measures, including their implementation and maintenance schedules. 

C. Non-Numeric Technology Based Effluent Limits. When developing control 

measures the following must be performed as applicable using the best 

practicable technology, best available technology, best control technology 

(BPT/BAT/BCT). The below listed Best Management Practices are 

considered limits of this General Permit which must be met for compliance. 

Additional Non-Numeric Technology Based Effluent Limits may also be 
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required as noted in the Sector specific requirements in Appendices A–AD. 

The methods utilized to meet these limits must be documented in the SWPPP: 

1. The permittee shall minimize exposure of the manufacturing process, and 

material or product storage areas to stormwater (where practicable) by 

locating industrial activities and materials inside or by protecting them 

with storm resistant coverings. By eliminating the exposure of the 

manufacturing process, and material or product storage areas as required 

by Appendix AE, the facility may qualify for No Exposure Certification. 

The Department also encourages methods and designs which minimize or 

mitigate impervious area and reduce runoff. 

2. The permittee shall perform good housekeeping procedures, and keep all 

exposed areas that are potential sources of pollutants clean and orderly. 

Implement at regular intervals, measures such as sweeping impervious 

areas, proper labeling of containers, and the storage of liquids within 

proper secondary containment. 

3. The permittee shall regularly inspect, test, maintain and repair all 

industrial equipment, systems and BMPs to prevent situations that may 

result in leaks, spills or other releases of pollutants. If the permittee or 

Department inspector finds that a structural control measure(s) must be 

repaired or modified to ensure proper function, the permittee shall make 

the required repairs or modifications as quickly as possible, but no later 

than twelve (12) weeks from discovery unless otherwise authorized by the 

Department. Temporary control measures must be in place during this 

time to reduce or prevent discharges of pollutants. If a non-structural 

control measure is found to be deficient, the correction of the deficiency 

for that control measure must be initiated within five (5) days and 

completed no later than thirty (30) days from discovery. (See Part V(E).) 

D. SWPPP Contents. The SWPPP must contain the following components: 

1. Pollution Prevention Team. The SWPPP must identify the individual(s) 

(by name or title) whom comprise the facility’s stormwater Pollution 

Prevention Team. The Pollution Prevention Team is responsible for 

assisting the facility/plant manager in developing, implementing, 

maintaining and revising the facility’s SWPPP. Responsibilities of each 

team member must be listed. 

2. Site Description. The SWPPP must include a narrative site description of 

the activities conducted at the site. 

3. Site Map. The site map must include: 

a. Approximate drainage boundaries including directions of 

stormwater flow and outfall locations (use arrows to show flow 

path); 

b. Boundary of impervious surfaces; 
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c. Locations of all existing structural BMPs to reduce pollutants in 

stormwater runoff; 

d. Locations of all surface waters including wetlands and streams; 

e. Locations of potential pollutant sources identified under Part 

V(D)(4) below; 

f. Locations where major spills or leaks identified under Part V(D)(5) 

have occurred within the past three years. For the purpose of the 

site map, mark only areas of frequent spills (greater than three 

occurrences per year) or large spills (greater than 10 gallons). 

ALL locations of fuel spills must be documented within the 

SWPPP; 

g. Locations of the following activities exposed to stormwater: 

fueling stations, vehicle and equipment maintenance, storage and 

cleaning areas; loading or unloading areas; locations used for the 

treatment, storage or disposal of wastes; liquid storage tanks; 

material processing, transfer or storage areas; access roads, rail 

cars or tracks; 

h. Locations of stormwater conveyance systems including swales, 

ditches, culverts, subsurface stormwater infrastructure, outfalls, 

including boat ramps, and an approximate outline of the area 

draining to each outfall; 

i. Location and description of non-stormwater discharges (e.g., 

wastewater licensed outfall); 

j. Location and source of run-on from adjacent property that contains 

either significant quantities of pollutants or volume to the facility; 

and 

k. The name of the nearest receiving water(s), including intermittent 

streams and wetland(s) that may receive discharges from the 

facility. An unnamed stream or wetland must be designated as 

such. The status of the receiving water in terms of water quality 

classification must also be noted. Contact a regional Stormwater 

Inspector for assistance if you are not aware of the classification 

status of the water body to which the facility discharges. 

4. Summary of Potential Pollutant Sources. The permittee shall identify each 

separate area where industrial materials or activities are exposed, or have 

the potential to be exposed to stormwater. Industrial materials or activities 

include, but are not limited to, material handling equipment or activities; 

industrial machinery; cleaning, fueling and maintenance of vehicles; 

equipment storage; and, storage of raw materials, intermediate products, 

by-products, final products, or waste products. Material handling 

activities include the storage, loading or unloading, transportation, or 

movement of any raw material, intermediate product, final product or 
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waste product. If applicable, include an evaluation of how the quality and 

quantity of the stormwater flowing onto the facility from adjacent 

properties impacts the stormwater discharges from the permitted facility. 

For each separate area identified, the description must include: 

a. Industrial activities area. A list of the activities (e.g., material 

storage, loading, access areas, equipment fueling and cleaning, 

cutting, grinding, or processing). Each drainage area must be 

described and include a prediction of the direction of flow and an 

estimate of the types of pollutants which may be present in the 

stormwater discharge. The flow of stormwater across the site must 

be clearly depicted on the site map; 

b. Pollutants. A list of the associated pollutant(s) or pollutant 

parameter(s) (e.g., crankcase oil, iron, biochemical oxygen 

demand, pH, sediment, etc.) for each activity. The pollutant list 

must include all significant materials that have been handled, 

treated, stored or disposed of in a manner that may allow exposure 

to stormwater three (3) years prior to review of or development of 

the SWPPP; and 

c. Method of on-site storage or disposal. A storage practice or 

disposal method must be detailed for all raw materials, 

intermediate materials, final products and waste materials. Waste 

materials must be handled in accordance with Maine’s Solid Waste 

Management Rules. 

5. Potential for Spills and Leaks. The permittee shall clearly identify areas 

where potential spills and leaks, may occur, along with the accompanying 

drainage points, and provide a list of spills and leaks that occurred during 

the three (3) year period prior to submitting a NOI or latest revision of the 

SWPPP for any area exposed to precipitation or area which drains to a 

stormwater conveyance. 

Spills and leaks include, but are not limited to, releases of oil or hazardous 

substances in excess of quantities that are reportable under Clean Water 

Act (CWA) §311 (See 40 CFR 110 and 40 CFR 117.21), section 102 of 

the Comprehensive Environmental Response, Compensation and Liability 

Act (CERCLA) or 38 M.R.S.A. §§ 543, 550 and 1318-B. Unlicensed 

discharges of oil and hazardous matter are prohibited (See 38 M.R.S.A. §§ 

543 & 1317-A). These discharges must be removed to the Commissioner’s 

satisfaction (See 38 M.R.S.A. §§ 1318-B, 548, 568). Hazardous matter 

discharges must be reported (See 38 M.R.S.A. §§ 1318-B). Oil and 

hazardous matter have “safe harbor” incentives for reporting (See 38 

M.R.S.A. §§ 550 & 1318). 

6. Wastewater/Process Water Containment. The location of all wastewater 

or process water containment tanks must be clearly noted in the SWPPP 
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and on the site map. Any stationary above ground tank, container, or 

container storage area used for the storage of wastewater or process water 

that has the potential to discharge to surface waters or a stormwater 

conveyance during a malfunction must be held in a secondary containment 

device capable of containing 100% of the contents of the tank, plus 

precipitation. The containment devices must meet all Federal and State 

rules for primary and secondary containment. Secondary containment 

may be waived if the tank is equipped with a level sensor and alarm to 

signal an overflow or leak and the facility has a contingency plan in place 

to remove excess liquid to a second containment structure or off site 

treatment facility to prevent exposure to stormwater. The containment 

structures must be visually inspected for signs of deterioration at least 

once per year. The contingency plan and tank inspection procedure must 

be documented in the SWPPP. (See CMR 06-096 520 for definitions.) 

7. Sampling Data. All stormwater sampling data, including visual 

monitoring results collected during the term of this General Permit must 

be maintained in the SWPPP. 

8. Stormwater Controls. Describe the type and location of existing nonstructural and structural BMPs selected for each area where industrial 

materials or activities are exposed to stormwater. All the areas identified 

in Part V(D)(4) and (5) must have a BMP(s) identified for the area’s 

discharges. For areas where BMPs are not currently in place, describe 

appropriate BMPs to control pollutants in stormwater discharges. The 

SWPPP must include an implementation schedule for all proposed BMPs. 

Refer to individual Sector(s) for additional requirements or guidelines for 

new BMP installations. Selection of all BMPs must take into account: 

• The quantity and nature of the pollutants, and their potential to impact 

the water quality of receiving waters; 

• Opportunities to combine the dual purposes of water quality protection 

and local flood control benefits (including physical impacts of high 

flows on streams such as bank erosion, impairment of aquatic habitat, 

etc.); and 

• Opportunities to offset stormwater and temperature impacts from 

impervious areas on dry weather flows and low flow situations to 

streams. 

9. BMP Types Considered. (See Part V(C) Non-Numeric Technology Based 

Effluent Limits.) The permittee shall describe how each BMP is currently 

implemented, or will be implemented. The following types of structural, 

and non-structural BMPs must be considered for implementation at the 

facility. This requirement may have been fulfilled with the area-specific 

BMPs identified under Part V(D)(8), in which case, the previous 

description is sufficient. However, many of the following BMPs may be 

more generalized or non site-specific and therefore not previously 
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considered. If the permittee, agent or Department stormwater inspector 

determines that any of these BMPs are not appropriate or are inadequate to 

reduce or eliminate pollutants, an explanation of this determination along 

with corrective actions must be documented in the SWPPP. The BMP 

examples listed below are not intended to be a comprehensive list. The 

permittee is encouraged to keep abreast of new BMPs or new applications 

of existing BMPs to find the most cost effective means of permit 

compliance for the facility. If BMPs are planned at the facility which are 

not listed previously in the SWPPP (e.g., replacing a chemical with a less 

toxic alternative, adopting a new or innovative BMP, etc.), include an 

implementation timeline within this section of the SWPPP. 

a. Non-Structural BMPs. 

Good Housekeeping: The permittee shall keep all exposed areas 

free of materials which could contribute pollutants to stormwater 

discharges by performing good housekeeping measures such as 

sweeping, and proper material containment. Measures must 

include compliance with the Non-Numeric Technology Based 

Effluent limits noted in Part V(C) and the individual Sector 

requirements in Appendices A-AD. 

Minimizing Exposure: Where practicable industrial materials and 

activities should be protected by a storm resistant shelter to prevent 

exposure to stormwater, or located in an area that does not 

discharge to a surface water or a MS4. 

Preventive Maintenance: The permittee shall implement a 

preventive maintenance program which includes the timely 

inspection and maintenance of stormwater management devices, 

(e.g., cleaning oil/water separators, catch basins) as well as 

inspecting, testing, maintaining and repairing facility equipment 

and systems to avoid breakdowns or failures that may result in 

discharges of pollutants to surface waters. 

Spill Prevention and Response Procedures: The permittee shall 

describe spill prevention and clean up procedures for spills or 

leaks. These procedures, and the necessary spill response 

equipment, must be made available to employees who may cause 

or encounter a spill or leak. Where appropriate, the permittee shall 

explain existing or planned material handling procedures, storage 

requirements, secondary containment, and equipment (e.g., 

diversion valves) in the SWPPP which are intended to minimize 

spills or leaks at the facility. Unlicensed discharges of oil and 

hazardous matter are prohibited (See 38 M.R.S.A. §§ 543 & 1317-

A). These discharges must be removed to the Commissioner’s 

satisfaction (See 38 M.R.S.A. §§ 1318-B, 548, 568). Hazardous 

matter discharges must be reported (See 38 M.R.S.A. §§ 1318-B). 
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Oil and hazardous matter have “safe harbor” incentives for 

reporting (See 38 M.R.S.A. §§ 550 & 1318). 

• Procedures to properly label all storage containers. 

• Preventative measures such as barriers between material 

storage and traffic areas, secondary containment provisions 

and procedures for material storage and handling. 

• Procedures for quick response to stop leaks, spills and other 

releases. Employees who may cause, detect or respond to a 

spill situation shall be properly trained. The training must 

be documented in the SWPPP. 

• Procedures to notify trained facility personnel, emergency 

response and regulatory agencies in the event of a spill or 

release. Documentation of spills and releases must be 

included in the facility SWPPP. 

Employee Training: The permittee shall describe the annual 

stormwater employee training program for the facility. The 

description must include the topics to be covered, (such as spill 

response, good housekeeping and material management practices). 

The permittee shall provide employee training for all employees 

who work in areas where industrial materials or activities are 

exposed to stormwater, and for employees who are responsible for 

implementing activities identified in the SWPPP (e.g., inspectors, 

spill responders and maintenance staff). The employee training 

must address the components and goals of the SWPPP. 

b. Structural BMPs. 

Sediment and Erosion Control: The permittee shall identify areas 

at the facility which, due to topography, land disturbance or other 

factors, have a potential for soil erosion. The permittee shall 

describe and implement structural, vegetative, or stabilization 

BMPs to manage runoff and limit erosion and sediment transport 

and the resulting discharge of pollutants. 

Stormwater Velocity Control: The permittee shall install 

stormwater velocity dissipation controls where appropriate. 

NOTE: This Permit requires compliance with Maine’s Erosion and Sedimentation 

Control Law. Installation of Structural BMPs may require a separate permit pursuant to 

the Natural Resources Protection Act, Maine Stormwater Management or the Site 

Location of Development Act. 

Stormwater structural devices: The permittee shall describe the 

stormwater management practices (permanent structural BMPs 

other than those which control the generation or source(s) of 

pollutants) that currently exist or are planned for the facility. 
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These types of BMPs typically are used to divert, filter, reuse, or 

otherwise reduce pollutants in stormwater discharges from the site. 

10. Other Controls. No solid materials, including floatable debris, may be 

discharged to waters of the State, except as authorized by a permit issued 

under section 404 of the Clean Water Act. Off-site vehicle tracking, or 

blowing, of raw, final, waste materials or sediments, and the generation of 

dust, must be minimized and documented in the SWPPP. 

E. Maintenance. All BMPs identified in the SWPPP must be maintained in 

effective operating condition. If site inspections identify BMPs that are not 

operating effectively, maintenance must be performed before the next 

anticipated storm event, or as necessary, to maintain the continued 

effectiveness of stormwater controls. If maintenance prior to the next 

anticipated storm event is impracticable, maintenance must be scheduled and 

implemented as soon as practicable, but not later than twelve (12) weeks from 

the date of discovery unless authorized by the Department. The maintenance 

schedule and reason for delay must be documented in the SWPPP. The 

Department will take into account the size and cost of the project, the need to 

obtain supplies, construction timeframes, weather, the amount of pollution 

discharged and the condition of receiving waters in determining if a delay is 

acceptable. In the case of non-structural BMPs, the effectiveness of the BMP 

must be maintained by appropriate means (e.g., available spill response 

supplies, training, etc.). Maintenance and BMP follow up actions must 

comply with Part V(I)(3) of this General Permit. 

F. Allowable Non-Stormwater Discharges. Allowable non-stormwater 

discharges are listed in Parts I(D) and (E). Except for flows from fire fighting 

activities, the permittee shall identify all sources of allowable non-stormwater 

discharge(s) in the SWPPP and include: 

• Identification of each allowable non-stormwater source; 

• The location where it is likely to be discharged; and 

• Descriptions of appropriate BMPs for each source. 

If mist blown from cooling towers is listed as an allowable non-stormwater 

discharge, the permittee shall specifically evaluate the potential for the 

discharge(s) to be contaminated by chemicals used in the cooling tower and 

determine that the levels of such chemicals would not cause or contribute to a 

violation of an applicable water quality standard. 

G. Applicable State or Local Plans. The SWPPP must be consistent and updated 

with applicable state or local stormwater, waste disposal, sanitary sewer or 

septic system regulations to the extent these apply to the facility and are more 

stringent than the requirements of this General Permit. 

H. Monitoring Frequency and Procedure Documentation. The SWPPP must 

document the procedures for conducting the three types of analytical 
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monitoring (Benchmark, Numeric, and Impaired Waters) and Visual 

Monitoring where applicable. These procedures are outlined in Part VI of this 

General Permit. SWPPP documentation must include the following: 

1. Location of sample collection (outfall designation). 

2. Sampling parameters and sampling frequency for each parameter 

including the benchmark or limit associated with that parameter. 

3. Monitoring schedule including monitoring exceptions, adverse weather 

conditions and waivers. 

I. Site Compliance Evaluations and Follow-up Corrective Actions. This General 

Permit requires the completion of quarterly site inspections or Site 

Compliance Evaluations. The SWPPP must include procedures for 

conducting and documenting the evaluations as required by this part. 

1. Frequency of Inspections. The permittee shall conduct Site Compliance 

Evaluations a minimum of four (4) times a year, one of which must be 

conducted within 24 hours of a qualifying storm event. These inspections 

must be evenly spaced with a minimum of sixty (60) days between 

inspections. Inspections must be done by qualified personnel as defined 

by the permittee. Qualified personnel may be either a facility employee or 

agent provided the inspector can accurately assess facility conditions that 

may impact stormwater discharges and BMP effectiveness. These 

inspections may be conducted in conjunction with Part (VI)(B), Quarterly 

Visual Monitoring, or be conducted separately. If the permittee decides to 

conduct more frequent inspections, the SWPPP must specify the frequency 

of inspections. 

2. Scope of the Site Compliance Evaluation. The evaluation/inspection must 

include all areas where industrial materials or activities are exposed to 

stormwater, as identified in Part V(D)(4), and all associated stormwater 

conveyances and areas where spills and leaks have occurred within the 

past three (3) years. Inspectors shall evaluate and document: 

a. Industrial materials, residue, or trash on the ground that could 

contaminate stormwater; 

b. Leaks or spills from industrial equipment, drums, barrels, tanks or 

similar containers; 

c. Offsite tracking of industrial materials or sediment where vehicles 

enter or exit the site; 

d. Tracking, blowing or whirling of raw, final, or waste materials and 

the evidence of, or the potential for, pollutants to contact 

stormwater; 

e. Stormwater BMPs identified in the SWPPP must be inspected and 

evaluated to ensure that they are operating correctly. Inspect 
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stormwater conveyances and outfalls for erosion, integrity and 

potential pollutants. Where discharge locations or outfalls are 

inaccessible, nearby downstream locations must be inspected if 

possible; and 

f. The once per year Non-Stormwater Discharge Certification may be 

incorporated into one of the four Site Compliance Evaluations. 

3. Site Compliance Evaluation Follow-up Actions. Based on the results of 

the Site Compliance Evaluation, the permittee shall: 

a. Complete a Site Compliance Evaluation Report. This report 

summarizes the scope of the inspection as noted in Part V(I)(2) 

above. The permittee shall prepare a Site Compliance Evaluation 

Report upon completing the inspection. This report must include 

the name(s) or position(s) of personnel performing the inspection, 

the date(s) of the evaluation, and major observations relating to the 

implementation of the SWPPP. The inspection report(s) must 

identify any incidents of non-compliance and proposed or 

implemented follow-up action(s). Where an inspection report does 

not identify any incidents of non-compliance, the report must 

contain a certification that the facility is in compliance with the 

SWPPP and this General Permit. The Department has prepared a 

guidance checklist that may be used or modified for reporting. 

b. Develop a Corrective Action Report (CAR). A Corrective Action 

Report is a description of actions, BMPs, site modifications or 

behaviors necessary to meet the terms and conditions of this 

General Permit. Two types of CARs may be generated. 

c. Structural BMP Corrective Action Report. This CAR includes 

modification(s) or addition(s) and implementation of a structural 

BMP(s). If a noted deficiency is related to a structural BMP 

excluding routine maintenance, the permittee shall notify the 

regional stormwater inspector within fourteen (14) business days 

by phone, email or USPS. Notwithstanding the timeframes 

described above, the Department reserves the right to take 

enforcement actions for unpermitted discharges. 

Note: If temporary stabilization measures are needed in emergency situations, a 

permittee may begin installation provided the addition of the BMP or stabilization 

measure is not in violation of State or Federal laws. The Department should be 

contacted with in 24 hours in these situations. 

d. Non-Structural BMP Corrective Action Report. This CAR notes 

the addition or modification of a non-structural BMP(s) which 

must be developed, implemented and kept with the SWPPP. 
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e. Content of a Corrective Action Report. All CARs must contain at 

a minimum the initial inspection date, a summary of the deficiency 

and corrective action(s) planned or implemented including 

temporary measures. The date the corrective action(s) was 

initiated, completed or expected to be completed. 

Inspection reports and follow-up CARs must be signed by the 

permittee in accordance with Part VIII(G). 

f. SWPPP Modification and Timeline for Completion of Corrective 

Actions. Modify the SWPPP as necessary (e.g., to show additional 

controls on the site map) as required by Part V(D)(3) and revise the 

description of controls as required by Part V(D)(8) to include 

additional or modified BMPs to correct problems identified in the 

Site Compliance Evaluation and Corrective Action Report. The 

permittee shall complete revisions to the SWPPP within thirty (30) 

calendar days following the inspection, and initiate changes to nonstructural BMPs within five (5) business days. If existing 

structural BMPs require modification or if additional structural 

BMPs are necessary, implementation must be completed before the 

next anticipated storm event to the extent practicable, but not more 

than twelve (12) weeks after discovery of the deficiency unless 

otherwise authorized by the Department. Temporary BMPs must 

be utilized during the design and construction phase of new 

structural BMPs. These temporary BMPs must be implemented as 

soon as practicable after the Site Compliance Evaluation is 

complete. The permittee shall retain a record of actions taken in 

accordance with Part V(I) of this General Permit as part of the 

SWPPP for at least three (3) years from the date that permit 

coverage expires or is terminated. 

J. SWPPP Documentation Requirements. The permittee shall keep the 

following inspection, monitoring and certification records on site with the 

facility’s SWPPP. The complete and up-to-date records which demonstrate 

full compliance with the conditions of this General Permit include: 

1. A copy of the NOI submitted to the Department along with any 

correspondence exchanged between the permittee and the Department 

specific to coverage of this General Permit. 

2. A copy of the Department’s acknowledgement letter assigning the facility 

Permit ID number, and discharge authorization. 

3. A copy of the General Permit, (electronic is acceptable), which can be 

made available to SWPPP team members. 

4. Dates and descriptions of spills, leaks, or other releases that resulted in 

discharges of pollutants to waters of the State through stormwater or 
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otherwise; the circumstances leading to the release and actions taken in 

response to the release; and, the measures taken to prevent the recurrence 

of such releases. 

5. Records of annual employee training, including topics covered, training 

date(s), and printed names and signatures of participating employees. 

6. Documentation of maintenance and repairs of stormwater control 

measures, including dates of regular maintenance, discovery dates of areas 

in need of repair or replacement; repair date when control measure(s) 

returned to full function; and, the justification for any extended 

maintenance or repair schedules. 

7. Documentation of inspections and monitoring data. 

8. Description of any deviations from monitoring schedules. 

9. Corrective Action Reports and summary of completed actions taken at the 

site, including event(s) and date(s) when problems were discovered and 

modifications occurred. 

10. Documentation of monitoring exceedances and the facility’s response 

including corrective actions; additional monitoring; documentation 

indicating the benchmark exceedance was due to natural background 

pollutant levels; or a finding of no further pollutant reductions were 

technologically, or economically, practicable, and achievable in light of 

best industry practice. 

11. Documentation to support any determination that pollutants of concern are 

not expected to be present above natural background levels if the 

permittee discharges directly to impaired waters, and that such pollutants 

were not detected in the discharge or were solely attributable to natural 

background sources. 

12. Documentation of the annual non-stormwater discharge certification. 

K. Requirement to Maintain Updated SWPPP. The permittee shall amend the 

SWPPP within thirty (30) days of completion of any of the following: 

1. A change in design, construction, operation, or maintenance at the facility 

that has a significant effect on the discharge or potential for discharge of 

pollutants from the facility including the addition or reduction of industrial 

activity; 

2. Monitoring, inspections, or investigations by the permittee or by local, 

State, or Federal officials which determine the SWPPP is ineffective in 

eliminating or significantly minimizing pollutants from sources identified 

under Part V(D)(4), or is otherwise not achieving the general objectives of 

controlling pollutants in discharge(s) from the facility; 
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3. A release of hazardous substances and oil (see 38 M.R.S.A. § 543, 550 

and 1318-B); and 

4. A discharge authorized under this General Permit that is determined by 

Department notification to cause or have the reasonable potential to cause 

or contribute to the violation of an applicable water quality standard. The 

SWPPP must document actions necessary to ensure future discharge(s) do 

not cause or contribute to the violation of a water quality standard. 

L. Department Review. Department staff may notify the permittee at any time 

that a SWPPP does not meet one or more of the minimum requirements of this 

General Permit. 

M. Signature, SWPPP Review and SWPPP Availability. The SWPPP must be 

signed in accordance with Part VIII(E), and a working copy retained at the 

facility covered by this General Permit. (See Part III(E) for records retention 

requirements.) The permittee shall only submit a copy of the SWPPP to the 

Department upon written notification. Upon the Department’s request, the 

SWPPP must be submitted electronically via e-mail or saved to a compact 

disc and mailed or hand delivered to the Department. 

N. Additional Requirements for SARA Title III Facilities. Potential pollutant 

sources for which the permittee has reporting requirements under EPCRA 313 

must be identified in the summary of potential pollutant sources as per Part 

V(D)(4). Note this additional requirement only applies to the permittee if the 

permittee is subject to reporting requirements under EPCRA 313. 

O. Salt Storage Pile Requirements. Salt storage pile(s) used for deicing or 

commercial or industrial purposes located at the facility, must be enclosed or 

covered to prevent exposure to precipitation, with exception of adding or 

removing materials from the pile, and for sand/salt storage piles at municipal 

public works facilities. See 06-096 CMR 574, and 38 M.R.S.A. §413(2-D) 

for additional requirements. 

Part VI. MONITORING REQUIREMENTS 

A. Monitoring Requirements and Limitations. The monitoring requirements and 

numeric limitations applicable to a facility depend on the types of industrial 

activities conducted. The permittee shall review Parts III (Permit Conditions), 

VI (Monitoring Requirements) and VII (Sector Specific Requirements) of this 

General Permit to determine which monitoring requirements and numeric 

limitations apply to the industrial activity or activities at the facility. 

1. Sector-specific monitoring requirements. Sector-specific monitoring 

requirements and limitations are applied outfall by outfall at facilities 

with multiple Sector-specific industrial activities. Where stormwater from 

multiple Sector-specific industrial mixes, the monitoring requirements and 

limitations are additional. 
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2. Approved watershed management plans. Participation in the 

implementation of a Department Approved Watershed Management Plan 

for discharges to impaired waters fulfills the requirement of Part VI. 

B. Quarterly Visual Monitoring. All permittees covered under this General 

Permit, regardless of the facility’s Sector of industrial activity are required to 

conduct quarterly visual monitoring. Visual monitoring requirements are 

waived if the facility is conducting Benchmark, Impaired Waters sampling 

and analysis, or Numeric Monitoring for Total Suspended Solids (TSS). 

Visual Monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 

1. Visual Monitoring Documentation. The permittee shall perform and 

document a visual examination of a stormwater discharge associated with 

industrial activity from each outfall (except representative outfalls) on a 

quarterly basis. The visual examination must be made during daylight 

hours and normal operations. If no qualifying storm event occurs during 

an inspection cycle, or adverse weather prevents collecting a sample, the 

permittee shall document this in the SWPPP, and is excused from visual 

monitoring for that quarter. Visual monitoring must be performed during 

the next qualifying storm event. The permittee shall sign and certify the 

documentation in accordance with Part VIII (E). The visual monitoring 

event must be performed and documented according to procedures 

outlined in document DEPLW0768, Visual Monitoring of Stormwater 

Discharges Associated with Industrial Activity, available at: 

http://www.maine.gov/dep/blwq/docstand/stormwater/multisector.htm#form

2. Qualifying storm event and visual examination procedures. A qualifying 

storm event is either precipitation, ice or snow melt that produces a 

measureable discharge at an outfall that occurs at least 72 hours from a 

previous qualifying storm event. A grab Sample must be collected within 

the first 60 minutes, but not more than 2.25 hours from the time 

stormwater begins to discharge from an outfall. The examination must 

document observations of color, odor, clarity, floating solids, settled 

solids, suspended solids, foam, oil sheen, and other obvious indicators of 

stormwater pollution. The sample examination must be conducted in a 

well lit area. Laboratory analytical testing is not required for visual 

samples. The 72-hour storm interval is waived if the permittee can 

document that less than a 72-hour interval is representative for local storm 

events during the sampling period. The same individual should perform 

visual monitoring for the entire permit term. 

C. Coal Pile Runoff Monitoring (Piles greater than 30 cubic yards). Monitoring 

must be conducted quarterly during a qualifying storm event. Discharges 

from coal piles are subject to numeric limits for total suspended solids (TSS) 
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not to exceed 50mg/L and pH 6.0-9.0 s.u. See Part VI(F) for additional 

requirements if TSS or pH exceeds the numeric the limit. 

1. The permittee shall comply with the limitations and monitoring 

requirements as referenced in Part I(B)(3)(c) for all discharges containing 

coal pile runoff, regardless of the facility’s Sector of industrial activity. 

2. The permittee shall not dilute coal pile runoff with stormwater or other 

flows in order to meet this limitation. 

3. The permittee shall collect a grab sample at the point of discharge and 

analyze the sample(s) for pH and TSS. Sampling results must be retained 

and reported in accordance with Part III(D). 

D. Impaired Waters Monitoring and Corrective Actions.

1. Monitoring for existing discharges to impaired waters without an EPA 

approved or established Total Maximum Daily Load (TMDL). Upon 

submittal of a NOI, the permittee is required to indicate if the discharge 

will be to an impaired waterbody as listed on the 303d list and defined in 

this General Permit. If the Department determines that the facility is 

contributing to the impaired status, or additional data is needed to 

determine if the stormwater discharge is contributing to the waterbody’s 

impairment, the permittee shall follow the monitoring requirements below. 

The Department will notify the permittee in writing of any additional 

monitoring requirements under this part. If the permittee does not receive 

notice from the Department to commence monitoring, no additional 

monitoring is required under this section.

If notified by the Department, the permittee shall monitor during a 

qualifying storm event. Monitoring must be conducted quarterly at each 

outfall (except for representative outfalls) according to the instructions in 

Part VI(E)(1-5) below. The permittee shall calculate the average of each 

parameter from the quarterly samples to determine the average monitoring 

value for each parameter.

a. Monitoring may be reduced to twice per calendar year if the 

average of the first year’s monitoring values indicate that the 

pollutant(s) for which the water body is impaired is not detected 

above natural background pollutant levels. Natural background 

pollutant levels include those substances that naturally occur in soil 

and groundwater, but do not include legacy or historical pollutants 

from earlier site activities or pollutants from neighboring sources 

which are not naturally occurring. In permit years three and four, 

the monitoring may be reduced to once per year if the average 

monitoring value for each parameter did not exceed natural 

background levels in permit year two (2) from the permittee’s 

stormwater discharge. 
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b. If the pollutant of concern is detected, but at levels consistent with 

natural background pollutant levels, the permittee shall keep the 

following documentation of this discharge with the facility’s 

SWPPP. 

i) An explanation of why the presence of the pollutant 

causing the impairment is detected at the outfall; 

ii) An explanation why the pollutant is not related to the 

activities at the facility; and 

iii) Data or studies which link the presence of the pollutant 

causing the impairment to what can be considered natural 

background sources in the watershed. 

c. If the presence of the pollutant causing the impairment is shown to 

be related to the facility and not due to natural background 

pollutant levels, the permittee shall determine the source of the 

pollutant. The permittee shall develop and implement a corrective 

action plan to reduce or eliminate the presence of the pollutant(s) 

in the stormwater discharge. This plan must be incorporated into 

the facility’s SWPPP, and submitted to the Department within the 

first quarter of the second permit year, or the first quarter of the 

second year after submittal of the NOI. Sampling for the 

pollutant(s) must continue quarterly until the pollutant is no longer 

present or a determination on the discharge is made by the 

Department. 

2. Monitoring and corrective actions for discharges to impaired waters with

an EPA approved or established TMDL. No additional monitoring is 

required unless specified in the TMDL or requested by the Department. 

If monitoring is required by the Department, and the results indicate the 

pollutant(s) that the TMDL addresses is present in the stormwater 

discharge in a quantity above the allowable allocation, the permittee shall 

develop and implement BMPs to meet the requirements of the TMDL. A 

corrective action plan must be developed and incorporated into the 

facility’s SWPPP. 

E. Monitoring Procedures for Discharges to Impaired Waters. The following 

applies only to facilities that have received notice from the Department that 

impaired waters monitoring is required. The notice will include the 

Department’s decision, and reason for additional monitoring. 

1. If a facility discharges to an impaired waterbody, the permittee shall 

perform quarterly monitoring at each outfall (except representative 

outfalls) that discharges to the impaired water for all pollutants for which 

the waterbody is impaired and for which a standard analytical method 

exists. (See 40 CFR part 136 for a list of approved methods.) 
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2. If the pollutants for which the waterbody is impaired are suspended solids, 

turbidity or sediments, the permittee shall monitor for Total Suspended 

Solids (TSS). 

3. If the pollutant for the impaired waterbody is an indicator or surrogate 

pollutant, the permittee shall monitor for that indicator or surrogate 

pollutant. 

4. If the impairment is due to impervious cover within the watershed, the 

facility shall calculate the amount of impervious area(s) discharging to the 

impaired waterbody and document this in the SWPPP. Additional 

monitoring and corrective actions may be required by the Department 

upon review of the results of the calculation, the facility’s SWPPP and 

existing BMPs. 

5. No monitoring is required when a waterbody’s biological communities are 

impaired and the Department has not specified an indicator or surrogate as 

causing the impairment, or when a waterbody’s impairment is related to 

hydrologic modifications. If the biological community is impaired and an 

indicator or surrogate is noted, the permittee shall monitor for the indicator 

or surrogate. 

F. Numeric Effluent Limitation Monitoring. Sectors A, B1, C, D, E, J, K, L & O 

have discharges subject to numeric effluent limitations that are authorized for 

coverage under this General Permit. The permittee shall collect two quarterly 

samples, and calculate the average of each parameter from the quarterly 

samples to determine an average monitoring value for each parameter. If the 

average of the first two quarterly samples for any parameter does not exceed 

the effluent limitation, the effluent monitoring requirements are fulfilled for 

the permit year. Results that do not exceed the numeric limitation must be 

recorded in the Facility’s SWPPP. If the average of the two quarterly 

samples exceeds the numeric effluent limitation for any parameter, the 

permittee shall submit results to the Department within 14 days of receiving 

the monitoring results. Additional monitoring requirements are outlined in 

each Sector when numeric limitations have been exceeded. Facilities are 

required to monitor such discharges to evaluate compliance with numerical 

effluent limits. (See also Part III C, Table 1 and Sector-specific 

requirements.) 

Numeric monitoring for Sectors: C, D, E, K, L, & O must be conducted 

quarterly during a qualifying storm event as described in Part VI(B)(2). 

Numeric monitoring for Sectors A, B and J are activity dependent nonstormwater discharges and are outlined in each Sector. 

G. Benchmark Monitoring Requirements. Benchmark concentrations are not 

numeric effluent limitations and exceeding the benchmark is not a permit 

violation. Benchmark monitoring data is primarily used to determine the 

 

1

Sector B is only required to conduct numeric monitoring if conducting wet decking operations.
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overall effectiveness of stormwater control measures, and to determine when 

additional corrective action(s) are required. Sectors A, B & N must perform 

quarterly benchmark monitoring from each outfall (except representative 

outfalls) that produces a stormwater discharge associated with an industrial 

activity. 

Benchmark monitoring must be conducted during a qualifying storm event as 

defined in this General Permit. A grab sample must be collected between 60 

minutes but not more than 2.25 hours from the time stormwater begins to 

discharge from an outfall. A grab sample(s) must be collected during daylight 

and normal operating hours. Department guidance and assistance is available 

for proper sampling techniques. Results must be summarized and reported in 

the Facility’s SWPPP. Appropriate corrective actions must be initiated 

according to Part VI(G)(2) below if there is an exceedance. 

Benchmark monitoring is not required if the facility is in compliance with and 

can demonstrate participation in the implementation of a Department 

Approved Watershed Management Plan. Benchmark Monitoring is not 

required from any outfalls subject to Impaired Waters sampling and analysis, 

or Numeric Monitoring for Total Suspended Solids (TSS). Benchmark 

Monitoring must be resumed if Numeric Monitoring or Impaired Waters 

sampling is ceased. 

1. Collect a minimum of four (4) quarterly samples. The permittee shall 

calculate the average of each parameter from the quarterly samples to 

determine an average monitoring value for each parameter. If the average 

of the four (4) monitoring values of the quarterly samples for any 

parameter does not exceed the benchmark, the monitoring requirements 

are fulfilled for that parameter, for the permit term. Samples must be 

analyzed using procedures consistent with methods listed in 40 CFR Part 

136. The use of an alternate method or benchmark parameter may be 

proposed by the permittee to the Department in writing. The Department 

will approve or deny the use of alternate methods or parameters on a caseby-case basis. 

2. After collecting four (4) quarterly samples, if the average of the four (4) 

monitoring values of the quarterly samples of any parameter exceeds the 

benchmark, the permittee shall review the selection, design, and 

implementation of control measures and complete a corrective action 

report. Upon making any necessary modifications, the permittee shall 

continue quarterly monitoring for any parameter that has exceeded its 

benchmark four additional quarters. 

3. If the average monitoring values of the subsequent quarterly samples of 

any parameter continues to exceed the benchmark, the permittee shall 

select, install and implement control measures including BMPs to address 

the selection and design considerations to meet the benchmark; or 
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4. Make the determination that no further pollutant reductions are 

technologically available, economically practicable and achievable in light 

of best industry practice to meet the technology based effluent limits in 

which case the permittee shall continue monitoring once per year. The 

rationale for this determination must be documented in the SWPPP. 

H. Monitoring Schedule. Visual monitoring, Coal pile monitoring, Impaired 

waters monitoring, Numeric monitoring for Sectors: C, D, E, K, L, & O and 

Benchmark monitoring requirements begin the first full quarter following the 

date of discharge authorization and must be conducted on a quarterly basis. 

The permittee shall monitor at least once in each of the following three (3) 

month intervals listed below. Numeric Monitoring schedules for Sectors A, B 

(for wet decking operations) and J are outlined in each Sector. 

January 1 – March 31 

April 1- June 30 

July 1 – September 30 

October 1 – December 31 

For example, if the applicant obtains coverage on May 1, 2011; the first monitoring 

period is July 1- September 30, 2011. 

I. Representative Outfalls. “Representative outfalls” means two or more outfalls 

within a single drainage area that discharge substantially identical effluents, 

have like industrial activities and significant materials or practices occurring 

within the outfalls’ designated drainage area. If the facility contains 

representative outfalls, the permittee may test the effluent of one of the 

outfalls during a given sampling period provided that subsequent samples are 

taken from a different outfall within the representative outfalls’ drainage area. 

The permittee will not be required to monitor more than one representative 

outfall within a designated drainage area per monitoring event. For this to be 

permissible, the SWPPP must include the permittee’s narrative and include 

the following: locations of the outfalls and associated drainage area; why the 

outfalls are expected to discharge substantially identical effluents; and, 

estimates of the size of the drainage area (in square feet) for each outfall(s). 

J. Monitoring Exceptions. If limited rainfall or frozen conditions prevent the 

discharge from an outfall, the permittee is excused from monitoring for that 

monitoring quarter. The altered schedule must be fully documented in the 

SWPPP. 

K. Adverse Weather Conditions. Adverse weather conditions are those which 

are dangerous or create inaccessibility for personnel and may include such 

things as local flooding, high winds, electrical storms, drought, excessive rain, 

frozen conditions and icing. If adverse weather conditions prevent the 

collection of samples these conditions must be documented in the SWPPP. 
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Part VII. SECTOR-SPECIFIC REQUIREMENTS FOR INDUSTRIAL ACTIVITY 

A. Sector Specific Requirements. The permittee shall comply with additional 

requirements of this part. Sector-specific requirements are in addition to the 

“basic” requirements specified in Parts I-VI and the General Permit 

Requirements in Part VIII of this General Permit. Sector specific 

requirements may be found in Appendices A-AD. No Exposure requirements 

may be found in Appendix AE. 

Part VIII. GENERAL REQUIREMENTS 

A. Duty to Comply. The permittee shall comply with all conditions of this 

General Permit. Any non-compliance may constitute a violation of Maine’s 

water quality laws, General Laws, and the federal Clean Water Act and opens 

up the discharger to penalties under 38 M.R.S.A. § 349, and § 309 of the 

Clean Water Act and is grounds for enforcement action. Enforcement action 

may include termination of authorization to discharge under the General 

Permit, and thus requiring that certain actions be taken in order to continue 

coverage, denial of permit re-authorization, instituting penalties, or other 

actions deemed applicable by the Department and other federal and local 

agencies. 

1. The permittee shall comply with effluent standards or prohibitions 

established under section 307(a) of the Clean Water Act, and 38 M.R.S.A., 

§ 420 or Chapter 530.5 for toxic pollutants within the time provided in the 

regulations that establish these standards or prohibitions, even if the 

General Permit has not yet been modified to incorporate the requirement. 

2. Any person who violates any provision of the laws administered by the 

Department, including without limitation, a violation of the terms of any 

order, rule, license, permit, approval or decision of the Board or 

Commissioner is subject to the penalties set forth in 38 M.R.S.A.§ 349. 

B. Continuation of the Expired General Permit. An expired General Permit 

continues in force and effect until a new General Permit is reissued. 

C. Duty to Reapply. If the permittee wishes to continue an activity regulated by 

this General Permit after the expiration and reissuance of this General Permit, 

the permittee shall apply for and obtain coverage under a new permit. 

D. Other applicable conditions. The conditions in 06-096 CMR 523(2) also 

apply to discharges pursuant to this General Permit and are incorporated 

herein as if fully set forth. These conditions address areas such as: duty to 

comply; need to reduce or halt activity not a defense; duty to mitigate; permit 

actions; property rights; duty to provide information; and, inspection and 

entry. 

E. Signatory Requirements. All Notices of Intent, SWPPPs, reports, 

certifications or information either submitted to the Department, or that this 
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General Permit requires to be maintained by the permittee, shall be signed and 

certified in accordance with 06-096 CMR 521(5). 

F. Oil and Hazardous Substance Liability. Nothing in this permit shall be 

construed to preclude the institution of any legal action or relieve the 

permittee from any responsibilities, liabilities, or penalties to which the 

permittee is or may be subject under Section 311 of the CWA. 38 M.R.S.A. § 

543, 550, and 1318-B. 

G. Release in Excess of Reportable Quantities. If a release in excess of 

reportable quantities occurs, the permittee shall notify the Department 

immediately. This permit does not relieve the permittee of the reporting 

requirements of 40 CFR 117, 40 CFR 302 and 38 M.R.S.A. § 543, 550 and 

1318-B. The discharge of hazardous substances in the stormwater 

discharge(s) from a facility shall be minimized in accordance with the 

applicable SWPPP for the facility, and in no case, during any 24-hour period, 

shall the discharge(s) contain a hazardous substance equal to or in excess of 

reportable quantities. 

H. Severability. The conditions of this General Permit are severable, and if any 

provision of this General Permit, or the application of any provision of this 

General Permit to any circumstance, is held invalid, the application of such 

provision to other circumstances and the remainder of this General Permit 

shall not be affected thereby. 

I. Transfer of Permit. This General Permit is not transferable to any person. 

J. State Laws. Nothing in this General Permit shall be construed to preclude the 

institution of any legal action or relieve the permittee from any 

responsibilities, liabilities, or penalties established pursuant to any applicable 

Maine State law. 

K. Proper Operations and Maintenance. The permittee shall at all times properly 

operate and maintain all facilities and systems of treatment and control (and 

related appurtenances) which are installed or used by the permittee to achieve 

compliance with the conditions of this General Permit and with the 

requirements of the SWPPP. Proper operation and maintenance also includes 

adequate laboratory controls and appropriate quality assurance procedures. 

Proper operation and maintenance requires the operations of backup or 

auxiliary facilities or similar systems, installed by a permittee only when 

necessary to achieve compliance with the conditions of the General Permit. 

L. Monitoring and Records.

1. Samples and measurements taken for the purpose of monitoring shall be 

representative of the volume and nature of the discharge over the sampling 

and reporting period. 
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2. The permittee shall retain records of all monitoring information including 

all calibration, maintenance records and all original strip chart recordings 

from continuous monitoring instrumentation, copies of all reports required 

by this General Permit, and records of all data used to complete the NOI 

for this General Permit, for a period of at least three (3) years from the 

date that the facility’s coverage under this General Permit expires or is 

terminated. This retention period may be extended by request of the 

Department at any time. 

3. Records of monitoring information shall include: 

a. The date, exact place, and time of sampling or measurements; 

b. The individual(s) who performed the sampling or measurements; 

c. The date(s) analyses were performed; 

d. The individual(s) who performed the analyses; 

e. The analytical techniques or methods used; and, 

f. The results of such analyses. 

4. Monitoring must be conducted according to test procedures approved 

under 40 CFR 136 and applicable Maine regulations, unless other test 

procedures have been specified in this General Permit. 

M. Bypass of Stormwater Control Facilities. Bypass means the intentional 

diversion of stormwater from any portion of the stormwater collection and 

treatment system. The permittee may allow any bypass to occur which does 

not cause effluent benchmark or numeric limitations (as noted by Sector) to be 

exceeded, but only if it also is for essential maintenance to assure efficient 

operation. These bypasses are not subject to the notice provisions below. 

1. Anticipated Bypass. If the permittee knows in advance of the need for a 

bypass which may exceed benchmark or numeric limitations, he or she 

shall notify this Department in writing at least ten days prior to the date of 

the bypass. Such notice shall include the anticipated quantity and the 

anticipated effect of the bypass. 

2. Unanticipated Bypass. Unanticipated bypass of stormwater control 

structures is prohibited unless one of the conditions in Part VIII(M)(3) of 

this section is met. The permittee shall submit notice of an unanticipated 

bypass. Any information regarding the unanticipated bypass shall be 

provided orally within 24 hours from the time the permittee became aware 

of the circumstances. A written submission shall also be provided within 

five (5) days of the time the permittee became aware of the bypass. The 

written submission shall contain a description of the bypass and its cause; 

the period of the bypass, including exact dates and times, and if the bypass 

has not been corrected, the anticipated time it is expected to continue; and 

steps taken or planned to reduce, eliminate and prevent reoccurrence of the 

bypass. 
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3. Prohibition of Bypass. Bypass is prohibited and enforcement action 

against the permittee may be taken for the bypass unless: 

a. The bypass was unavoidable to prevent loss of life, personal injury 

or severe property damage; and 

b. There were no feasible alternatives to the bypass, such as the use 

of auxiliary treatment facilities, retention of untreated waste, or 

maintenance during normal periods of equipment downtime. This 

condition is not satisfied if the permittee should, in the exercise of 

reasonable engineering judgment, have installed adequate backup 

equipment to prevent a bypass which occurred during normal 

periods of equipment downtime or preventative maintenance. 

c. The Department may approve an anticipated by-pass after 

considering its adverse effects, if the Department determines that 

proper notification was made as determined in paragraph 

VIII(M)(1), and it will meet the two conditions of paragraph 

VIII(M)(3) above.2 

N. Upset Conditions.

1. Definition. Upset means an exceptional incident in which there is 

unintentional and temporary noncompliance with technology based 

effluent limitations because of factors beyond the reasonable control of the 

permittee. An upset does not include noncompliance to the extent caused 

by operational error, improperly designed treatment facilities, inadequate 

treatment facilities, lack of preventive maintenance, or careless or 

improper operation. 

2. Effect of an upset. An upset constitutes an affirmative defense to an 

action brought for noncompliance with such technology based effluent 

limitations if the requirements of Part VIII(N)(3) of this General Permit 

are met. No determination made during administrative review of claims 

that noncompliance was caused by upset, and before an action for 

noncompliance, is final administrative action subject to judicial review. 

3. Conditions necessary for a demonstration of upset. A permittee whom 

wishes to establish an affirmative defense of an upset shall demonstrate, 

through properly signed, current operating logs, or other relevant 

evidence, that: 

a. An upset occurred and the permittee can identify the specific 

cause(s) of the upset; 

b. The permitted facility was at the time being properly operated; and 

c. The permittee submitted notice of the upset within 24 hours;3

 

2

See 06-096 CMR 523(2)(m) 

3

 See 06-096 CMR 523(2)(n)
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d. The permittee complied with any remedial measures required4. 

4. The permittee must provide the burden of proof during enforcement 

proceedings involving occurrence of an upset. 

O. Inspection and Entry. Employees and agents of the Department may enter any 

property at reasonable hours in order to determine compliance. 

P. Reopener. This General Permit may be modified or reopened as provided in 

38 M.R.S.A. § 414-A (5). 

Q. Requiring an Individual Permit or an Alternative General Permit.

1. The Department may require any owner(s) or operator(s) authorized to 

discharge stormwater under this General Permit to apply for and obtain 

either an individual MEPDES permit or an alternative general permit. 

Any interested person may petition the Department to take action under 

this paragraph. 

2. Any owner(s) or operator(s) authorized to discharge stormwater by this 

General Permit may request to be excluded from coverage of this General 

Permit by applying for an individual permit. The request may be granted 

by issuance of an individual permit. 

3. If a facility requests or is required to obtain coverage under an individual 

permit, then authorization to discharge stormwater under this General 

Permit shall automatically be terminated on the date of issuance of the 

individual permit. Until such time as an alternative permit is issued, the 

existing General Permit remains fully in force. 

R. Availability of Reports. Except for data determined to be confidential under 

Part VIII(S) below, all reports prepared in accordance with the terms of this 

General Permit shall be available for public inspection at the DEP at 28 Tyson 

Drive, Augusta Maine. As required by the CWA, effluent data shall not be 

considered confidential. Knowingly making any false statement on any such 

report may result in penalties including the possibility of fine and 

imprisonment. 

S. Confidentiality of Information. Any information submitted to the Department 

pursuant to these regulations may be claimed as confidential by the submittee. 

Any such claim must be asserted at the time of the submission in the manner 

prescribed on the application form or instructions or, in the case of other 

submissions, by stamping the words "confidential business information" on 

each page containing such information. If no claim is made at the time of 

submission, the Department may make the information available to the public 

without further notice. 

 

4

Ibid
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A claim of confidentiality will be denied unless the Department determines 

that the information may be withheld in accordance with 38 M.RS.A. 414 (6), 

Confidentiality of records, and 38 M.R.S.A. 401 et. seq., Freedom of Access. 

T. Right to Appeal. All final license or permit decisions made by the 

commissioner may be appealed to the Board of Environmental Protection 

pursuant to Title 38, § 341-D (4) or a judicial appeal may be filed. 

U. Notice Required. Prior to discharging under the terms of a General Permit, a 

person shall file with the Department an initial Notice of Intent (NOI) for 

coverage on a form provided by the Department for the specific discharge 

category. A check for the appropriate fee amount must accompany each NOI 

in order for the application for coverage under the General Permit to be 

considered complete. 

V. Effective Date of Coverage. The Department must notify an applicant for 

coverage under this General Permit within 30 days of receipt of each complete 

NOI as to whether or not coverage for the specific discharge is accepted. If 

the Department does not notify the applicant within 30 days, the NOI is 

deemed to be accepted and coverage is granted. In the event coverage is not 

granted, the Department shall notify the applicant of the reasons for not 

granting coverage. Discharges not acceptable for General Permit coverage 

may apply for issuance of an individual discharge permit. 

W. Continuing Coverage. Coverage under an existing General Permit will be 

continued upon payment of an applicable annual fee, provided there are no 

changes in the discharge as described in the NOI. If changes occur or are 

proposed, the person having filed the NOI shall notify the Department, as 

specified in the General Permit. Persons wishing to continue coverage are 

required to so notify the Department. 

X. Transfers of Ownership. This General Permit is not transferable. In the event 

that the ownership of a facility or discharge is transferred to a new owner(s) or 

operator(s), coverage under this General Permit may be obtained by the new 

owner by filing a new Notice of Intent form with the Department. The former 

owner shall also file a Notice of Termination. 

Y. General Restrictions. A discharge covered by a General Permit may not: 

1. Contain any pollutant, including toxic substances, in quantities or 

concentrations which may cause or contribute to any adverse impact on 

the receiving water; 

2. Be to a receiving water which is not meeting its classification standard for 

any characteristic which may be affected by the discharge; or, 

3. Impart color, taste, turbidity, radioactivity, settleable materials, floating 

substances, or other properties that cause the receiving water to be 

unsuitable for the designated uses ascribed to its classification. 
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Z. Sampling and Test Procedures. Where a General Permit requires sampling 

and testing of an effluent of other waste stream, all samples and measurements 

shall be representative of the volume and nature or the activity being 

monitored. The sampling, preservation, handling and analytical methods used 

must conform with Standard Methods for the Examination of Water and 

Waste Water, American Public Health Association, Washington D.C., latest 

approved edition or methods referenced in 40 CFR Part 136. However, 

different but equivalent methods are allowable if they receive prior written 

approval from the Department. 

AA. Monitoring Requirements. The Department may require additional 

monitoring of an individual discharge as may be reasonably necessary in order 

to characterize the nature, volume or other attributes of that discharge or its 

sources. 

AB. Removed Substances. Solids, sludges, filter backwash or other pollutants 

removed or resulting from the treatment of wastewaters must be disposed of in 

a manner approved by the Department. 

Part IX. DEFINITIONS 

The following terms have the following meanings as used in this General Permit. These 

definitions are intended to be consistent with the definitions at 38 MRSA §§ 361-A and 

466, 06-096 CMR 520 and 521(9)(b), and 40 CFR §§ 122.2 and 122.26(b). 

A Anticipated Bypass. “Anticipated Bypass” means a bypass of stormwater 

control structure(s) including operational or structural best management 

practice(s), which is planned or scheduled due to maintenance, repair or other 

known reason. Provisions must be developed to protect the receiving water 

from pollutants during an anticipated bypass of a stormwater control. 

B Best Available Technology (BAT). “Best Available Technology” or “BAT” 

means the technology-based standard established by the Clean Water Act as 

the most appropriate means available on a national basis for controlling the 

direct discharge of toxic and nonconventional pollutants. In general, BAT 

effluent limitations guidelines represent the best existing performance of 

treatment technologies that are economically achievable. 

C Best Control Technology (BCT). “Best Control Technology” or “BCT” 

means a technology-based standard established by EPA for the discharge from 

existing conventional pollutants including Biological Oxygen Demand 

(BOD), Total Suspended Solids (TSS), fecal coliform, pH, oil and grease. 

The BCT is established in light of a two-part "cost reasonableness" test which 

compares the cost for an industry to reduce its pollutant discharge with the 

cost to treat for similar levels of reduction of a pollutant loading. The second 

test examines the cost-effectiveness of additional industrial treatment beyond 
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BPT. EPA must find limits which are reasonable under both tests before 

establishing them as BCT. 

D Best Management Practices (BMPs). “Best Management Practices” or 

“BMPs” means schedules of activities, prohibitions of practices, maintenance 

procedures, and other management practices to prevent or reduce the 

discharge of pollutants to waters of the State. BMPs also include treatment 

requirements, operating procedures, and practices to control plant site runoff, 

spillage or leaks, sludge or waste disposal, or drainage from raw material 

storage. 

E Best Practicable Control Technology (BPT). “Best Practicable Control 

Technology” or “BPT” means the first level of technology-based standards 

established by the Clean Water Act to control the discharge of pollutants. 

BPT effluent limitation guidelines are generally based on the average of best 

existing performance by plants within an industrial category or subcategory. 

F Control Measure. “Control Measure” means BMP or other method (including 

effluent limitations) used to prevent or reduce the discharge of pollutants to 

waters of the States. 

G Department. “Department” means the State of Maine Department of 

Environmental Protection. 

H Department Approved Watershed Management Plan. “Department Approved 

Watershed Management Plan” means, for the purpose of this General Permit, 

the implementation of a Plan approved by the Department that has a means of 

funding that is in effect to meet all of the following requirements: 

1. The Management Plan must adequately assess the watershed for pollutants 

and activities contributing to the waterbody’s impairment. 

2. The causes found to be contributing to the water quality impairment must 

be adequately addressed via structural or operational Best Management 

Practices in the watershed. The Management Plan will be reviewed by 

Department staff to determine the ability of the Management Plan to 

improve water quality based on the known pollutants and causes of 

impairment and for compliance with any approved TMDLs. 

3. The Plan must include a schedule of implementation and a monitoring 

component to assess the progress of the watershed in attaining the goals of 

the Management Plan. 

The Long Creek Watershed Management Plan in the municipalities of South 

Portland, Portland, Westbrook and Scarborough is a Department Approved 

Watershed Management Plan. 

I Discharge. “Discharge” means any spilling, leaking, pumping, pouring, 

emptying, disposing or other addition of any pollutant to waters of the State. 
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J Facility. “Facility” means a location where stormwater discharges associated 

with industrial activity occur including but not limited to, buildings, storage 

areas, travel ways and processing areas. 

K Facility Associated with Industrial Activity. “Facility Associated with 

Industrial Activity” means the point source discharge which is directly related 

to manufacturing, processing, or raw material storage areas described in 

Appendices A-AD. This includes, but is not limited to, stormwater discharges 

associated with industrial activity. 

L Infiltration. “Infiltration” means any process specifically used to meet all or 

part of the stormwater standards of this General Permit by actively directing 

all or part of the stormwater into the soil. Infiltration is the process by which 

runoff percolates through the unsaturated overburden and fractured bedrock to 

the water table. For this General Permit, infiltration does not include: 

1. Incidental wetting of soil in ditches, detention basins or the equivalent; 

2. Wetting of underdrained basins, dry swales, or similar filtration systems; 

or 

3. Wetting buffers meeting department requirements for stormwater control. 

M Impaired Waters. “Impaired Waters” means for the purposes of this General 

Permit, any water body listed on the 303d list of Maine’s Integrated Water 

Quality Monitoring and Assessment Report. 

N Municipal Separate Storm Sewer System (“MS4”). “Municipal Separate 

Storm Sewer System” or “MS4” means conveyances for stormwater, 

including, but not limited to, roads with drainage systems, municipal streets, 

catch basins, curbs, gutters, ditches, human-made channels or storm drains 

(other than publicly owned treatment works and combined sewers) owned or 

operated by any municipality, sewer or sewage district, Maine Department of 

Transportation, Maine Turnpike Authority, State agency or Federal agency or 

other public entity that discharges directly to waters of the State other than 

groundwater. 

O No Exposure. “No Exposure” means that industrial activities are protected by 

a storm resistant shelter to prevent exposure to stormwater including rain, 

snow, snowmelt, run-on and runoff. 

P Non-Numeric Technology Based Effluent Limitations. “Non-Numeric 

Technology Based Effluent Limits” means Best Management Practices 

approved and required by the Department that are designed and installed 

according to Best Practical Technology and Best Available Technology. This 

technology limits or eliminates pollutants generated on-site by industrial 

activities from coming into contact with waters of the State. Non-Numeric 

Technology Based Effluent limits are assigned by industrial activity and are 

described in the appropriate Sector specific Appendix. 
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Q Notice of Intent (“NOI”). “Notice of Intent” or “NOI” means a notification of 

intent to seek coverage under this General Permit made by the applicant to the 

Department on a form provided by the Department. 

R Notice of Termination (“NOT”). “Notice of Termination” or “NOT” means a 

notification to end coverage under this General Permit on a form provided by 

the Department. 

S Outfall. “Outfall” means any direct discharge of stormwater from an area of 

industrial activity to waters of the State or to a MS4. 

T Owner or Operator. “Owner or Operator” means the owner or operator of any 

“facility or activity” subject to regulation under the NPDES program. In the 

case of a publicly owned facility or activity, the owner shall be included as a 

licensee in any permit issued under the State NPDES program. 

U Permittee. “Permittee” means the person that is covered under this General 

Permit for discharge of stormwater associated with industrial activity. 

V Person. “Person” means an individual, firm, corporation, municipality, quasimunicipal corporation, (such as a watershed district), state agency, federal 

agency or other legal entity. 

W Point Source. “Point Source” or “direct discharge” means a discharge from 

any discrete, confined or discernible conveyance, including, but not limited to, 

any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, 

rolling stock, concentrated animal feeding operation, landfill leachate 

collection system, vessel, or other floating craft from which pollutants are or 

may be discharged. This does not include discharges to buffers designed and 

maintained in accordance with Chapter 500 Appendix F. 

X Qualifying Storm Event. “Qualifying Storm Event” means a storm event that 

is either precipitation, ice or snow melt that produces a measureable discharge 

at an outfall that occurs at least 72 hours from a previous measureable storm 

event. 

Y Stormwater. “Stormwater” means precipitation including runoff from rain, 

snow melt or ice melt that flows across the surface as sheet flow, shallow 

concentrated flow or in drainage ways. “Stormwater” means the same as 

Storm Water. 

Z Stormwater Discharge Associated with Industrial Activity. “Stormwater 

Discharge Associated with Industrial Activity” means the discharge from any 

conveyance which is used for collecting and conveying stormwater and which 

is directly related to manufacturing, processing or raw materials storage areas 

at an industrial plant or facility. The term does not include discharges from 

facilities or activities excluded from the MEPDES program under 38 MRSA 

413. For the categories of industries identified in Table 2 and Appendices A – 
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AD, the term includes, but is not limited to, point sources stormwater 

discharges from the following areas: industrial plant yards; immediate access 

roads and rail lines used or travelled by carriers of raw materials, 

manufactured products, waste material, or by-products used or created by the 

facility; material handling sites; refuse sites; sites used for the application or 

disposal of process waste waters (as defined at Chapter 525); sites used for the 

storage and maintenance of material handling equipment; sites used for 

residual treatment, storage or disposal; shipping and receiving areas; 

manufacturing buildings; storage areas (including tank farms) for raw 

materials, and intermediate and finished products; and areas where industrial 

activity has taken place in the past and significant materials remain and are 

exposed to storm water. 

AA Surface Water. “Surface Water” means for purposes of this General Permit, 

any river, stream, brook, freshwater wetland, coastal wetland, lake, pond or 

ocean including the marginal and high seas. 

BB Unanticipated Bypass. “Unanticipated Bypass” means for purposes of this 

General Permit, an unanticipated bypass of stormwater discharge from the site 

that was originally intended to go through a structural control device to 

remove pollutants associated with an industrial activity from that stormwater 

discharge. An unanticipated bypass may include the over topping or complete 

bypass of a stormwater pond or structural stormwater collection system. All 

unanticipated bypasses must be reported to the Department according to Part 

VIII(M)(2) of the General Permit. 
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Table 2. Sectors of Industrial Activity Covered By this General Permit 

SIC Code or 

Activity Code 

Activity Represented 

SECTOR A: TIMBER PRODUCTS

2411 Log Storage and Handling (Wet deck storage areas only authorized if no chemical 

additives are used in the spray water or applied to the logs) 

2421 General Sawmills and Planning Mills 

2426 Hardwood Dimension and Flooring Mills 

2429 Special Product Sawmills, Not Elsewhere Classified 

2431-2439 

(except 2434) 

Millwork, Veneer, Plywood, and Structural Wood (see Sector W) 

2448, 2449 Wood Containers 

2451, 2452 Wood Buildings and Mobile Homes 

2491 Wood Preserving 

2493 Reconstituted Wood Products 

2499 Wood Products, Not Elsewhere Classified 

SECTOR B: PAPER AND ALLIED PRODUCTS

2611 Pulp Mills 

2621 Paper Mills 

2631 Paperboard Mills 

2652-2657 Paperboard Containers and Boxes 

2671-2679 Converted Paper and Paperboard Products, Except Containers and Boxes 

SECTOR C: CHEMICAL AND ALLIED PRODUCTS

2812-2819 Industrial Inorganic Chemicals 

2821-2824 Plastics Materials and Synthetic Resins, Synthetic Rubber, Cellulosic and Other 

Manmade Fibers Except Glass 

2833-2836 Medicinal chemicals and botanical products; pharmaceutical preparations, in vitro and in 

vivo diagnostic substances; biological products, except diagnostic substances 

2841-2844 Soaps, Detergents, and Cleaning Preparations; Perfumes, Cosmetics, and Other Toilet 

Preparations 

2851 Paints, Varnishes, Lacquers, Enamels, and Allied Products 

2861-2869 Industrial Organic Chemicals 

2873-2879 Agricultural Chemicals 

2873 Facilities that Make Fertilizer Solely from Leather Scraps and Leather Dust 

2891-2899 Miscellaneous Chemical Products 

3952 (limited to 

list 

Complete list can be found in Sector C specific requirements 

SECTOR D: ASPHALT PAVING AND ROOFING MATERIALS AND LUBRICANTS

2951,2952 Asphalt Paving and Roofing Materials 

2992,2999 Miscellaneous Products of Petroleum and Coal 

SECTOR E: GLASS, CEMENT, CLAY, CONCRETE, STONE,AND GYPSUM PRODUCTS

3211 Flat Glass 
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Table 2. Sectors of Industrial Activity Covered By this General Permit 

SIC Code or 

Activity Code 

Activity Represented 

3221,3229 Glass and Glassware, Pressed or Blown 

3231 Glass Products Made of Purchased Glass 

3241 Hydraulic Cement 

3251-3259 Structural Clay Products 

3261-3269 Pottery and Related Products 

3271-3275 Concrete, Gypsum and Plaster Products

3281 Cut Stone and Cut Stone Products 

3291-3299 Abrasive, Asbestos, and Miscellaneous Nonmetallic Mineral Products 

SECTOR F: PRIMARY METALS

3312-3317 Steel Works, Blast Furnaces, and Rolling and Finishing Mills 

3321-3325 Iron and Steel Foundries 

3331-3339 Primary Smelting and Refining of Nonferrous Metals 

3341 Secondary Smelting and Refining of Nonferrous Metals 

3351-3357 Rolling, Drawing, and Extruding of Nonferrous Metals 

3363-3369 Nonferrous Foundries (Castings) 

3398,3399 Miscellaneous Primary Metal Products 

SECTOR G: METAL MINING (ORE MINING AND DRESSING)

1011 Iron Ores 

1021 Copper Ores 

1031 Lead and Zinc Ores 

1041,1044 Gold and Silver Ores 

1061 Ferroalloy Ores, Except Vanadium 

1081 Metal Mining Services 

1094,1099 Miscellaneous Metal Ores 

SECTOR H: COAL MINES AND COAL MINING RELATED FACILITIES

1221-1241 Coal Mines and Coal Mining-Related Facilities 

SECTOR I: OIL AND GAS EXTRACTION AND REFINING

1311 Crude Petroleum and Natural Gas 

1321 Natural Gas Liquids 

1381-1389 Oil and Gas Field Services 

2911 Petroleum Refineries 

SECTOR J: MINERAL MINING AND DRESSING

1411 Dimension Stone 

1422-1429 Crushed and Broken Stone, Including Rip Rap 

1442,1446 Sand and Gravel 

1455,1459 Clay, Ceramic, and Refractory Materials 

1474-1479 Chemical and Fertilizer Mineral Mining 

1481 Nonmetallic Minerals Services, Except Fuels 

1499 Miscellaneous Nonmetallic Minerals, Except Fuels 
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Table 2. Sectors of Industrial Activity Covered By this General Permit 

SIC Code or 

Activity Code 

Activity Represented 

SECTOR K: HAZARDOUS WASTE TREATMENT, STORAGE, OR DISPOSAL FACILITIES

HZ Hazardous Waste Treatment Storage or Disposal 

SECTOR L: LANDFILLS AND LAND APPLICATION SITES

LF Landfills, Land Application Sites , and Open Dumps 

SECTOR M: AUTOMOBILE SALVAGE YARDS

5015 Automobile Salvage Yards 

SECTOR N: SCRAP RECYCLING FACILITIES

5093 Scrap Recycling Facilities 

SECTOR O: STEAM ELECTRIC GENERATING FACILITIES

SE Steam Electric Generating Facilities 

SECTOR P: LAND TRANSPORTATION AND WAREHOUSING

4011,4013 Railroad Transportation 

4111-4173 Local and Highway Passenger Transportation 

4212-4231 Motor Freight Transportation and Warehousing 

4311 United States Postal Service 

5171 Petroleum Bulk Stations and Terminals 

SECTOR Q: WATER TRANSPORTATION

4412-4499 Water Transportation 

SECTOR R: SHIP AND BOAT BUILDING OR REPAIRING YARDS

3731, 3732 Ship and Boat Building or Repairing Yards 

SECTOR S: AIR TRANSPORTATION

4512-4581 Air Transportation Facilities 

SECTOR T: TREATMENT WORKS

TW Treatment Works 

SECTOR U: FOOD AND KINDRED PRODUCTS

2011-2015 Meat Products 

2021-2026 Dairy Products 

2032 Canned, Frozen and Preserved Fruits, Vegetables and Food Specialties 

2041-2048 Grain Mill Products 

2051-2053 Bakery Products 

2061-2068 Sugar and Confectionery Products 

2074-2079 Fats and Oils 

2082-2087 Beverages 

2091-2099 Miscellaneous Food Preparations and Kindred Products 

2111-2141 Tobacco Products 

SECTOR V: TEXTILE MILLS, APPAREL, AND OTHER FABRIC PRODUCT 

MANUFACTURING, LEATHER AND LEATHER PRODUCTS

2211-2299 Textile Mill Products 
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Table 2. Sectors of Industrial Activity Covered By this General Permit 

SIC Code or 

Activity Code 

Activity Represented 

2311-2399 Apparel and Other Finished Products Made From Fabrics and Similar Materials 

3131-3199 

(except 3111) 

Leather and Leather Products, except Leather Tanning and Finishing 

(see Sector Z) 

SECTOR W: FURNITURE AND FIXTURES

2434 Wood Kitchen Cabinets 

2511-2599 Furniture and Fixtures 

SECTOR X: PRINTING AND PUBLISHING

2711-2796 Printing, Publishing, and Allied Industries 

SECTOR Y: RUBBER, MISCELLANEOUS PLASTIC PRODUCTS, AND MISCELLANEOUS 

MANUFACTURING INDUSTRIES

3011 Tires and Inner Tubes 

3021 Rubber and Plastics Footwear 

3052, 3053 Gaskets, Packing, and Sealing Devices and Rubber and Plastics Hose and Belting 

3061, 3069 Fabricated Rubber Products, Not Elsewhere Classified 

3081-3089 Miscellaneous Plastics Products 

3931 Musical Instruments 

3942-3949 Dolls, Toys, Games and Sporting and Athletic Goods 

3951-3955 

(except 3952) 

Pens, Pencils, and Other Artists' Materials 

3961, 3965 Costume Jewelry, Costume Novelties, Buttons, and Miscellaneous Notions, Except 

Precious Metal 

3991-3999 Miscellaneous Manufacturing Industries 

SECTOR Z: LEATHER TANNING AND FINISHING

3111 Leather Tanning and Finishing 

SECTOR AA: FABRICATED METAL PRODUCTS

3411-3499 Fabricated Metal Products, Except Machinery and Transportation Equipment 

3911-3915 Jewelry, Silverware, and Plated Ware 

SECTOR AB: TRANSPORTATION EQUIPMENT, INDUSTRIAL OR COMMERCIAL 

MACHINERY

3511-3599 

(except 3571-

3579) 

Industrial and Commercial Machinery (except Computer and Office Equipment) (see 

Sector AC) 

3711-3799 

(except 3731, 

3732) 

Transportation Equipment (except Ship and Boat Building and Repairing) (see Sector R) 

SECTOR AC: ELECTRONIC, ELECTRICAL, PHOTOGRAPHIC, AND OPTICAL GOODS

3571-3579 Computer and Office Equipment 
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Table 2. Sectors of Industrial Activity Covered By this General Permit 

SIC Code or 

Activity Code 

Activity Represented 

3612-3699 Electronic, Electrical Equipment and Components, except Computer Equipment 

3812 Measuring, Analyzing and Controlling Instrument; Photographic and Optical Goods 

SECTOR AD: STORMWATER DISCHARGES DESIGNATED BY THE DEPARTMENT 

The Sector AD is used to provide permit coverage for facilities designated by the Department as needing a 

stormwater permit, and any discharges of stormwater associated with industrial activity that do not meet the 

description of an industrial activity covered by Sectors A-AC. 

Eligibility for Permit Coverage. Because this Sector is primarily intended for use by discharges designated by the 

Department as needing a stormwater permit (which is an atypical circumstance), and the facility may or may not 

normally be discharging stormwater associated with industrial activity, you must obtain the Department’s written 

permission to use this permit prior to submitting an NOI. If you are authorized to use this permit, you will still be 

required to ensure that your discharges meet the basic eligibility provisions of this General Permit.

A complete list of SIC codes can be obtained from the internet at 

http://www.osha.gov/pls/imis/sic_manual.html or in paper from various locations in the 

document titled: “Handbook of Standard industrial Classifications”, Office of 

Management and Budget, 1987. 
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Appendix A 

Sector A - Timber Products 

A. Covered Stormwater Discharges. The requirements for Sector A apply to stormwater 

discharges associated with Timber Products facilities as identified by the SIC Codes 

specified below. 

SECTOR A: TIMBER PRODUCTS 

2411 Log Storage and Handling (Wet deck storage areas only authorized if no 

chemical additives are used in the spray water or applied to logs) 

2421 General Sawmills and Planing Mills 

2426 Hardwood Dimension and Flooring Mills 

2429 Special Product Sawmills, Not Elsewhere Classified 

2431-2439 

(except 2434) 

Millwork, Veneer, Plywood, and Structural Wood (see Sector W) 

2448, 2449 Wood Containers 

2451, 2452 Wood Buildings and Mobile Homes 

2491 Wood Preserving 

2493 Reconstituted Wood Products 

2499 Wood Products, Not Elsewhere Classified 

B. Limitations on Coverage. This General Permit does not authorize stormwater 

discharges from material or storage areas where there may be contact with sprayed 

chemical formulations to provide wood surface protection. These discharges must be 

covered by a separate MEPDES permit. 

C. Authorized Non-Stormwater Discharges. This permit authorizes the intentional 

wetting of logs at wet deck storage areas where no chemical additives are used in the 

spray down waters and no chemicals are applied to the wood prior to or during 

storage. The non-stormwater component of the discharge must be compliant with 

Part V(D)(8) of the General Permit and numeric effluent limitations for this Sector. 

D. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) The permittee shall identify areas where any 

of the following may be exposed to stormwater: processing areas; equipment used 

for chemical treatment and chemical storage areas; treated wood and residue 

storage areas; wet decking areas; dry decking areas; untreated wood and residue 

storage areas. 

2. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) If 

the facility has used chlorophenolic, creosote or chromium-copper-arsenic 

formulations for wood surface protection or preserving, the following must also 

be identified in the SWPPP: areas where contaminated soils, treatment equipment 

and stored materials are located, and the BMPs identified and implemented to 

minimize the contact of these areas and materials with stormwater. 
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3. Stormwater Management Controls. (See also Part V(D)(8) and (9).) The 

permittee shall describe and implement measures to address the following 

activities or pollutant sources from: log, lumber and wood product storage areas; 

residue storage areas; loading and unloading areas; material handling areas; 

chemical storage areas; wood surface preservation and, equipment or vehicle 

maintenance, storage and repair areas. 

4. Monthly Inspections. (See also Part V (I)(1-3).) If the facility performs wood 

surface protection or preservation activities, the permittee shall inspect all 

processing areas, transport areas and treated wood storage areas on a monthly 

basis to assess the effectiveness of practices implemented to minimize the 

accumulation of treatment chemicals in soils and stormwater discharges. 

5. Good Housekeeping. Good housekeeping includes removal of yard debris and 

accumulated wood waste and sediments to limit the discharge of woody debris, 

minimize leachate generated from decaying wood materials and minimize the 

generation of dust from log storage and handling areas, including all wet decking 

areas. This must be performed twice per calendar year unless the facility has an 

approved log yard maintenance plan. When there is an exceedance of the 

benchmark for TSS as noted in Part E(1) of this Appendix, from an outfall that 

drains any log storage or handling area, removal of yard debris must be completed 

within twelve (12) weeks of the exceedance unless otherwise authorized by the 

Department. The entire storage and handling area does not need to be cleaned of 

accumulated material at one time, provided housekeeping procedures are adequate 

to meet benchmark values. Yard waste must be handled and disposed of in 

accordance with the Maine Solid Waste Management Rules. The permittee shall 

document a schedule of the implemented good housekeeping measures at the 

facility. 

6. Material Containment. Use containment devices to prevent the tracking, blowing 

or drifting of sawdust, bark or wood chips to surface waters. Containment 

devices may include but are not limited to, wooden, concrete or metal barriers or 

structures to prevent tracking, blowing or drifting of material. Chipping and 

shredding activities should be performed in a designated, screened area designed 

to prevent tracking, blowing or drifting of the wood products to surface waters. 

Screening may consist of netting, fencing, or other containment device used to 

capture wind blown particles associated with the chipping or shredding activity. 

If stormwater associated with the material containment area(s) drains to a waste 

treatment or process sewer system, only screening to prevent tracking, blowing or 

drifting of the material to stormwater conveyances or surface waters must be 

utilized. 

7. Water Usage Plan. Facilities conducting log watering activities must develop and 

implement a water usage plan which minimizes the amount of water utilized in 

the wet decking process. This plan must outline routine inspections and 

maintenance of BMPs and control measures. Water discharged from the wet 

decking process must be contained to the maximum extent practicable using the 
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best practicable and best available technology (BPT/BAT). This must be included 

in the facility’s SWPPP. 

E. Monitoring and Reporting Requirements. (See also Part VI.)

1. Benchmark Monitoring Requirements. These Benchmark parameters apply to 

primary and secondary industrial activities, as well as any multiple sector specific 

industrial activity. Quarterly samples must be collected as described in Part VI of 

this general permit. Quarterly samples must be collected during a qualifying storm 

event. The permittee shall collect a grab sample from each outfall (except 

representative outfalls) that produces a stormwater discharge associated with an 

industrial activity. The permittee shall conduct benchmark monitoring for: 

a. TSS – 100 mg/L 

b. pH – 6-9 s.u. 

The permittee shall calculate the average of each parameter from the quarterly 

samples to determine an average monitoring value for each parameter. If the 

average of the four (4) monitoring values of the quarterly samples for any 

parameter does not exceed the benchmark, the monitoring requirements are 

fulfilled for that parameter, for the permit term. If the average of the four (4) 

monitoring values of the quarterly samples of any parameter exceeds the 

benchmark, the permittee shall review the selection, design, and implementation 

of control measures and complete a corrective action report. Upon making any 

necessary modifications, the permittee shall continue quarterly monitoring for 

four additional quarters. Additional monitoring or corrective actions may be 

required by the Department based on a review of benchmark or visual monitoring 

results. 

Additional monitoring associated with Wood Preserving (SIC 2491). Facilities 

which perform wood preserving or protection activities must also perform 

quarterly benchmark monitoring for Arsenic and Copper. 

a. Arsenic – 0.15 mg/L 

b. Copper (hardness dependent) 

Water Hardness Range Copper (mg/L) 

0-25 mg/L .0038 

26-50 mg/L .0056 

51-75 mg/L .0090 

76-100 mg/L .0123 

101-125 mg/L .0156 

126-150 mg/L .0189 

151-175 mg/L .0221 

176-200 mg/L .0253 

201-225 mg/L .0285 

226-250 mg/L .0316 

251+ mg/L .0332 
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2. Numeric Monitoring Requirements. The requirements must be performed only 

during log watering operations. Samples must be collected from the point of 

discharge from this activity. If the facility has a control measure such as a 

detention pond or log watering pond that recycles spray water, and the treatment 

pond does not produce a measurable discharge, no sampling is required. If this 

activity produces a measurable discharge, the permittee shall collect at least two 

(2) samples separated by at least 30 days and analyze the samples for pH and 

woody debris. If the average of the two (2) samples for pH is between 6.0 and 9.0 

s.u. monitoring requirements for pH are fulfilled for the permit year. No debris 

greater than one inch in diameter may be discharged. If the average of the two (2) 

pH samples exceeds the numeric limit, or if woody debris is discharged, the 

permittee shall review the selection, design and implementation of control 

measures, complete a corrective action report and notify the Department within 14 

days of the exceedance. Upon making any necessary modifications, the permittee 

shall collect and analyze two (2) additional samples for any parameter that 

exceeded the numeric effluent limitation. Additional monitoring may be required. 

SECTOR A: TIMBER PRODUCTS- SECTOR SPECIFIC NUMERIC LIMITATIONS 

SIC 

Code 

Regulated Activity Parameter Numeric Limitation** 

2411 Wet Decking Discharges at 

Log Storage and Handling 

Facilities 

pH 

Debris (woody material 

such as bark, twigs, 

branches, heartwood, or 

sapwood) 

6.0-9.0 s.u. 

No debris that can pass 

through a (1”) diameter 

round opening 

3. Visual Monitoring Requirements. Visual monitoring must be conducted quarterly 

during a qualifying storm event. Collect a grab sample for visual monitoring 

analysis from each outfall that has an associated industrial activity within the 

outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with 

and can demonstrate participation in the implementation of an established 

Department Approved Watershed Management Plan; or if the facility is 

conducting Benchmark, Impaired Waters sampling and analysis, or Numeric 

Monitoring for Total Suspended Solids (TSS). Visual monitoring is only waived 

for the outfall(s) associated with Numeric Monitoring. The permittee shall 

conduct quarterly visual monitoring at outfalls that do not require Numeric 

Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix B 

Sector B - Paper and Allied Products Manufacturing. 

A. Covered Stormwater Discharges. The requirements for Sector B apply to stormwater 

discharges associated with Paper and Allied Products Manufacturing facilities as 

identified by the SIC Codes below. 

SECTOR B: PAPER AND ALLIED PRODUCTS 

2611 Pulp Mills 

2621 Paper Mills 

2631 Paperboard Mills 

2652-2657 Paperboard Containers and Boxes 

2671-2679 Converted Paper and Paperboard Products, Except Containers and Boxes 

B. Authorized Non-Stormwater Discharges. This permit authorizes the intentional 

wetting of logs at wet deck storage areas where no chemical additives are used in the 

spray down waters and no chemicals are applied to the wood prior to or during 

storage. The non-stormwater component of the discharge must be compliant with 

Part V(D)(8) of the General Permit and numeric effluent limitations for this sector. 

C. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) The permittee shall identify areas where any 

of the following may be exposed to stormwater: processing areas; equipment used 

for chemical treatment and chemical storage areas; wood and residue storage 

areas; wet decking areas; dry decking areas. 

2. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) If 

the facility uses alternative fuel sources e.g., hog fuel or shredded materials these 

must be identified in the SWPPP. The permittee shall identify and implement 

BMPs to minimize the contact of these materials with stormwater. 

3. Stormwater Management Controls. (See also Part V(D)(8) and (9).) The 

permittee shall describe and implement measures to address the following 

activities or pollutant sources from: log and wood product storage areas; residue 

storage areas; loading and unloading areas; material handling areas; chemical 

storage areas; fueling and fuel storage areas and, equipment or vehicle 

maintenance, storage and repair areas. 

4. Good Housekeeping. Good housekeeping includes removal of yard debris and 

accumulated wood waste and sediments to limit the discharge of woody debris, 

minimize leachate generated from decaying wood materials and minimize the 

generation of dust from log storage and handling areas, including all wet decking 

areas. This must be performed twice per calendar year. Unless the facility has an 

approved log yard maintenance plan. When there is an exceedance of the 

benchmark for either TSS or COD as noted in Part D(1) of this Appendix, from an 

outfall that drains any log storage or handling area, removal of yard debris must 
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be completed within twelve (12) weeks of the exceedance unless otherwise 

authorized by the Department. The entire storage and handling area does not

need to be cleaned of accumulated material at one time, provided housekeeping 

procedures are adequate to meet benchmark values. Yard waste must be handled 

and disposed of in accordance with the Maine Solid Waste Management Rules. 

The permittee shall document a schedule of the implemented good housekeeping 

measures at the facility. 

5. Material containment. Use containment devices to prevent the tracking, blowing 

or drifting of sawdust, bark or wood chips to surface waters. Containment 

devices may include but are not limited to, wooden, concrete or metal barriers or 

structures to prevent tracking, blowing or drifting of material. Chipping and 

shredding activities should be performed in a designated, screened area to prevent 

wind blown tracking of the wood products to surface waters. Screening may 

consist of netting, fencing, or other screen used to capture windblown particulate 

matter associated with the chipping or shredding activity. If stormwater 

associated with the material containment area drains to a waste treatment or 

process sewer system, only screening to prevent wind blown tracking of the 

material to surface waters or stormwater conveyance system must be utilized. 

6. Water Usage Plan. Facilities conducting log watering activities must develop and 

implement a water usage plan which minimizes the amount of water utilized in 

the wet decking process. This plan must outline routine inspections and 

maintenance of BMPs and control measures. Water discharged from the wet 

decking process must be contained to the maximum extent practicable using the 

best practicable and best available technology (BPT/BAT). This must be included 

in the facility’s SWPPP. 

D. Monitoring and Reporting Requirements. (See also Part VI.)

1. Benchmark Monitoring Requirements: These benchmark parameters apply to 

primary and secondary industrial activities, as well as any multiple sector specific 

industrial activity. Quarterly samples must be collected as described in Part VI of 

this General Permit during a qualifying storm event. The permittee shall collect a 

grab sample from each outfall (except representative outfalls) that produces a 

stormwater discharge associated with an industrial activity except facilities 

covered under SIC codes 2671-2679. Conduct benchmark monitoring for: 

a. TSS – 100 mg/L or COD – 120 mg/L 

b. pH – 6-9 s.u. 

The permittee shall calculate the average of each parameter from the quarterly 

samples to determine an average monitoring value for each parameter. If the 

average of the four (4) monitoring values of the quarterly samples for any 

parameter does not exceed the benchmark, the monitoring requirements are 

fulfilled for that parameter, for the permit term. If the average of the four (4) 

monitoring values of the quarterly samples of any parameter exceeds the 

benchmark, the permittee shall review the selection, design, and implementation 

of control measures and complete a corrective action report. Upon making any 
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necessary modifications, the permittee shall continue quarterly monitoring for 

four additional quarters. Additional monitoring or corrective actions may be 

required by the Department based on a review of Benchmark or Visual 

Monitoring results. 

2. Numeric Monitoring Requirements. The requirements must be performed only 

during log watering operations. Samples must be collected at the point of 

discharge from this activity. If the facility has a control measure such as a 

detention pond or log watering pond that recycles spray water, and the treatment 

pond does not produce a measurable discharge no sampling is required. If this 

activity produces a measurable discharge, the permittee shall collect at least two 

(2) samples separated by at least 30 days and analyze the samples for pH and 

woody debris. If the average of the two (2) samples for pH is between 6.0-9.0 s.u. 

monitoring requirements for pH are fulfilled for the permit year. No debris 

greater than one (1) inch in diameter may be discharged. If the average of the two 

(2) pH samples exceeds the numeric limit, or if woody debris is discharged the 

permittee shall review the selection, design and implementation of control 

measures, complete a corrective action report and notify the Department within 14 

days of the exceedance. Upon making any necessary modifications, the permittee 

shall collect and analyze two (2) additional samples for any parameter that 

exceeded the numeric effluent limitation. Additional monitoring may be required. 

SECTOR B: Paper and Allied Products Manufacturing 

SECTOR SPECIFIC NUMERIC LIMITATIONS 

Regulated Activity Parameter Numeric Limitation 

Wet Decking Discharges at 

Log Storage and Handling 

Locations 

pH 

Debris (woody material such 

as bark, twigs, branches, 

heartwood, or sapwood) 

6.0 - 9.0 s.u. 

No debris that can pass through a 

(1”) diameter round opening 

3. Visual Monitoring Requirements. (See also VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for 

visual monitoring analysis from each outfall that has an associated industrial 

activity within the outfall’s drainage area. The outfall(s) must be sampled 

quarterly unless the facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with 

and can demonstrate participation in the implementation of an established 

Department Approved Watershed Management Plan; or if the facility is 

conducting Benchmark, Impaired Waters sampling and analysis, or Numeric 

Monitoring for Total Suspended Solids (TSS). Visual monitoring is only waived 

for the outfall(s) associated with Numeric Monitoring. The permittee shall 

conduct quarterly Visual Monitoring at outfalls that do not require Numeric 

Monitoring. 

Visual monitoring must be resumed if Numeric Monitoring or Impaired 

Waters sampling is ceased.
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Appendix C 

Sector C - Chemical and Allied Products Manufacturing. 

A. Covered Stormwater Discharges. The requirements for Sector C apply to stormwater 

discharges associated with Chemical and Allied Products Manufacturing facilities as 

identified by the SIC Codes specified below.

SECTOR C: CHEMICAL AND ALLIED PRODUCTS 

2812-2819 Industrial Inorganic Chemicals 

2821-2824 Plastic Materials and Synthetic Resins, Synthetic Rubber, Cellulosic and Other 

Manmade Fibers Except Glass 

2833-2836 Medicinal Chemicals and Botanical Products; Pharmaceutical Preparations; In 

Vitro and In Vivo Diagnostic Substances; Biological Products, except 

Diagnostic Substances 

2841-2844 Soaps, Detergents, and Cleaning Preparations; Perfumes, Cosmetics, and Other 

Toilet Preparations 

2851 Paints, Varnishes, Lacquers, Enamels and Allied Products 

2861-2869 Industrial Organic Chemicals 

2873-2879 Agricultural Chemicals 

2873 Facilities that Make Fertilizer Solely from Leather Scraps and Leather Dust 

2891-2899 Miscellaneous Chemical Products 

3952 (limited 

to list) 

Inks and Paints, Including China Painting Enamels, India Ink, Drawing Ink, 

Platinum Paints for Burnt Wood or Leather Work, Paints for China Painting, 

Artist's Paints and Artist's Watercolors 

B. Limitations on Coverage. This General Permit does not authorize: non-stormwater 

discharges containing inks, paints or substances (hazardous, nonhazardous, etc.) 

resulting from an onsite spill, including materials collected in drip pans; washwater 

from material handling and processing areas; and washwater from drum, tank or 

container rinsing and cleaning processes. 

C. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) Identify where any of the following may be 

exposed to stormwater: processing and storage areas; access roads, railcars and 

tracks; areas where substances are transferred in bulk; and operating machinery. 

2. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) 

Describe the following sources and activities that have potential pollutants 

associated with them: loading, unloading and transfer of chemicals; outdoor 

storage of salt, pallets, coal, drums, containers, fuels, fueling stations; vehicle and 

equipment maintenance or cleaning areas; areas where the treatment, storage or 

disposal (on or off-site) of waste or wastewater occur; storage tanks and other 

containers; processing and storage areas; access roads, railcars and tracks; areas 

where the transfer of substances in bulk occurs; and areas where machinery 

operates. 
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3. Inspections. (See also Part V(I).) As part of the facility maintenance program, 

the following areas must be inspected and documented monthly: material storage 

and handling areas; liquid storage tanks; hoppers or silos; vehicle and equipment 

maintenance; cleaning and fueling areas; material handling vehicles; and, 

equipment and processing areas. 

4. Good Housekeeping. (See also Part V(D)(9)(a).) Perform good housekeeping 

including supervised loading, unloading and transfer of bulk chemicals and 

inspections for spills and leaks; routinely inspect the condition of all drums, tanks 

and containers for potential leaks. The permittee shall prevent the exposure of 

fine granular solids to stormwater, by storing these materials in a covered 

structure such as silos, hoppers or buildings. The SWPPP must document a 

schedule of the implemented good housekeeping measures at the facility SWPPP. 

5. Material containment. Any outside material storage piles must be contained by 

structural means and include daily pile maintenance. Containment may include 

wooden, concrete or metal barriers to prevent tracking and drifting of material. 

D. Monitoring and Reporting Requirements. (See also Part VI.)

1. Numeric Effluent Monitoring. The permittee shall collect at least two (2) 

quarterly samples and analyze the sample for total phosphorus and fluoride. If the 

average of the two (2) samples for either parameter does not exceed the effluent 

limitation the monitoring requirements are fulfilled for that parameter for the 

permit year. If the average of the two (2) samples exceeds the effluent limitation 

for either parameter the permittee shall review the selection, design and 

implementation of control measures, complete a corrective action report and 

notify the Department within 14 days of receiving the monitoring results. Upon 

making any necessary modifications, the permittee shall collect and analyze two 

additional samples for the parameter that exceeded the effluent limitation. 

Additional monitoring may be required. 

If the values of the first three years of numeric effluent limit monitoring does 

not exceed the numeric limitation for any parameter, numeric monitoring 

may be reduced to once a year for the remainder of the permit term. 

SECTOR C: CHEMICAL AND ALLIED PRODUCTS- SECTOR SPECIFIC NUMERIC LIMITATIONS 

SIC 

Code 

Regulated Activity Parameter Numeric Limitation 

2874 

Stormwater from Phosphate fertilizer 

Manufacturing facilities that during 

manufacturing or processing, comes into 

contact with any raw materials, intermediate 

products, finished product, by-product or waste 

product 

Total Phosphorus 

(as P) 

Fluoride 

105.0 mg/L, daily max 

35 mg/L, 30-day avg. 

75.0 mg/L, daily max 

25.0 mg/L, 30-day avg. 

2. Visual monitoring Requirements. (See also VI(C).) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for 
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visual monitoring analysis from each outfall that has an industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with 

and can demonstrate participation in the implementation of an established 

Department Approved Watershed Management Plan; or if the facility is 

conducting Benchmark, Impaired Waters sampling and analysis, or Numeric 

Monitoring for Total Suspended Solids (TSS). Visual monitoring is only waived 

for the outfall(s) associated with Numeric Monitoring. The permittee shall 

conduct quarterly Visual Monitoring at outfalls that do not require Numeric 

Monitoring. 

Visual monitoring must be resumed if Numeric Monitoring or Impaired 

Waters sampling is ceased. 
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Appendix D 

Sector D - Asphalt Paving and Roofing Materials and Lubricant 

Manufacturers. 

A. Covered Stormwater Discharges. The requirements for Sector D apply to stormwater 

discharges associated with Asphalt Paving and Roofing Materials and Lubricant 

Manufacturers facilities as identified by the SIC Codes specified below. 

SECTOR D: ASPHALT PAVING AND ROOFING MATERIALS AND LUBRICANTS

2951, 2952 Asphalt Paving and Roofing Materials 

2992, 2999 Miscellaneous Products of Petroleum and Coal 

B. Limitations on Coverage. This General Permit does not authorize discharges 

associated with fats and oils rendering; discharges from oil recycling facilities; 

discharges associated with detergents, petroleum or non-petroleum products applied 

to dump bodies to prevent asphalt from sticking; and vehicle wash water. 

C. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Inspections. (See also Part V(I).) Inspect the following areas monthly: material 

storage and handling areas; liquid storage tanks and associated valves including 

secondary containment structures; hoppers or silos; vehicle and equipment 

maintenance; cleaning and fueling areas; material handling vehicles; and, 

equipment and processing areas. Ensure that vehicle and equipment wash water 

does not come in contact with surface water. Appropriate actions must be taken 

as a response to inspections and follow up procedures must be documented in the 

SWPPP. 

2. Good Housekeeping. Perform frequent inspection and management of all 

material storage piles. This includes removal and sweeping of accumulated or 

spilled materials, and removal of accumulated gravel or other material in travel 

ways and stormwater conveyances. The SWPPP must document a schedule of the 

implemented good housekeeping measures at the facility. 

3. Material Containment. Aggregate and other storage piles must be contained by 

structural means or by daily pile maintenance. Containment may include wooden, 

concrete or metal barriers to prevent tracking or drifting of material. 

D. Numeric Monitoring Requirements. Only discharges from areas where asphalt 

paving and roofing emulsions are produced are subject to numeric monitoring 

requirements. (See Also Part VI.) The permittee shall collect at least two (2) 

quarterly samples and analyze the sample for TSS, oil and grease and pH. If the 

average of the two (2) samples for any parameter does not exceed the numeric 

effluent limitation, the monitoring requirements are fulfilled for those parameters for 

the permit year. If the average of the two (2) samples exceeds the effluent limitation 

for any parameter the permittee shall review the selection, design and implementation 
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of control measures, complete a corrective action report and notify the Department 

within 14 days of receiving the monitoring results. Upon making any necessary 

modifications, the permittee shall collect and analyze two additional samples for any 

parameter that exceeded the effluent limitation*. Additional monitoring may be 

required. *Example: If a facility collects two quarterly samples for numeric 

monitoring and analyzes each sample for TSS, Oil and Grease, and pH and the 

average of the two samples for TSS and pH meets the numeric limit, and Oil and 

Grease exceeds the numeric limit subsequent numeric monitoring must only be 

conducted for Oil and Grease. 

If the values of the first three years of numeric effluent limit monitoring does not 

exceed the numeric limitation for any parameter, numeric monitoring may be 

reduced to once a year for the remainder of the permit term. 

SECTOR D: ASPHALT PAVING AND ROOFING MATERIALS AND LUBRICANTSSECTOR SPECIFIC NUMERIC LIMITATIONS 

SIC 

Code 

Regulated Activity Parameter Numeric Limitation 

2951, 

2952 

Discharges from areas where production of 

asphalt paving and roofing emulsions occurs 

TSS 

Oil and Grease 

pH 

100.0 mg/L daily max 

15.0 mg/L daily max 

6.0-9.0 s.u. 

E. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Numeric Monitoring or Impaired Waters 

sampling is ceased. 
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Appendix E 

Sector E - Stone, Glass, Clay, Cement, Concrete, and Gypsum Products 

A. Covered Stormwater Discharges. The requirements for Sector E apply to stormwater 

discharges associated with Glass, Cement, Clay, Concrete, Gypsum, Cut Stone, 

Abrasive, Asbestos and miscellaneous Products facilities as identified by the SIC 

Codes specified below. 

SECTOR E: GLASS, CLAY, CEMENT, CONCRETE, AND GYPSUM PRODUCTS

3211 Flat Glass 

3221, 3229 Glass and Glassware, Pressed or Blown 

3231 Glass Products Made of Purchased Glass 

3241 Hydraulic Cement 

3251-3259 Structural Clay Products 

3261-3269 Pottery and Related Products 

3171-3275 Concrete, Gypsum and Plaster Products 

3281 Cut Stone and Stone Products 

3291-3299 Abrasive, Asbestos, and Miscellaneous Nonmetallic Mineral Products 

B. Limitations on Coverage. This General Permit does not authorize discharges 

associated with equipment or vehicle wash-out and wash water or process water 

associated with cutting stone. 

C. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) Identify the locations of the following, as 

applicable: bag house or other dust control device; recycle/sedimentation pond, 

clarifier or other device used for the treatment of process wastewater; the areas 

that drain to the treatment device and associated outfall(s). 

2. Inspections. (See also Part V(I).) Conduct and document weekly inspections of 

all active material storage piles, processing equipment and processing areas. 

Implement measures such as sweeping or removing accumulated or spilled dust, 

granular solids or gravel from travel ways and stormwater conveyances. Conduct 

and document monthly inspections for liquid storage tanks; hoppers or silos; 

vehicle and equipment maintenance; cleaning and fueling areas; material handling 

vehicles.

3. Good Housekeeping. (See also Part V(D)(9)(a).) Implement measures to prevent 

or minimize the discharge of spilled cement; aggregate (including sand or gravel); 

kiln dust; fly ash; settled dust; or other significant materials. 

Non-structural measures. If cement dust, kiln dust, fly ash or settled solids are 

generated or processed at the facility, the permittee shall sweep product and 

material storage areas weekly from all paved areas. Where practicable, the 

permittee shall prevent the exposure or processing of fine granular solids from 

coming in contact with stormwater, by storing or processing these materials in 
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covered silos, hoppers, buildings or other control structures. The permittee shall 

document a schedule of the implemented Good Housekeeping measures at the 

facility in the SWPPP.

D. Certification. (See also Part V(I)(2)(f) and Part I(E).) Facilities must include a 

description of measures that ensure that all process waste water resulting from truck 

washing, mixers, transport buckets, molds or forms, wet saws or other equipment are 

discharged or recycled in accordance with MEPDES requirements. This information 

must be stated in the non-stormwater discharge certification. 

E. Numeric Monitoring Requirements. Numeric monitoring must be performed only at 

facilities that manufacture cement. (See Also Part VI.) The permittee shall collect at 

least two (2) quarterly samples and analyze the sample for TSS, and pH. If the 

average of the two (2) samples for either parameter does not exceed the numeric 

effluent limitation, the monitoring requirements are fulfilled for those parameters for 

the permit year. If the average of either of the two (2) samples exceeds the numeric 

effluent limitation for any parameter the permittee shall review the selection, design 

and implementation of control measures, complete a corrective action report and 

notify the Department within 14 days of receiving the monitoring results. Upon 

making any necessary modifications, the permittee shall collect and analyze two 

additional samples for any parameter that exceeded the effluent limitation. 

Additional monitoring may be required. 

If the values of the first three years of numeric effluent limit monitoring do not 

exceed the numeric limitation for any parameter, numeric monitoring may be 

reduced to once a year for the remainder of the permit term. 

SECTOR E: GLASS, CLAY, CEMENT, CONCRETE AND GYPSUM PRODUCTSSECTOR SPECIFIC NUMERIC LIMITATIONS 

Regulated Activity Parameter Numeric Limitation 

Discharges from material storage piles at cement manufacturing 

facilities, including raw & waste materials, intermediate products, 

finished products, used or derived from manufacturing cement. 

TSS 

pH

50.0 mg/L daily max 

6.0-9.0 s.u.

F. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 
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Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Numeric Monitoring or Impaired Waters 

sampling is ceased.
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Appendix F 

Sector F - Primary Metals 

A. Covered Stormwater Discharges. The requirements for Sector F apply to stormwater 

discharges from Primary Metals facilities as identified by the SIC Codes specified 

below. 

SECTOR F: PRIMARY METALS 

3312-3317 Steel Works, Blast Furnaces, and Rolling and Finishing Mills 

3321-3325 Iron and Steel Foundries 

3331-3339 Primary Smelting and Refining of Nonferrous Metals 

3341 Secondary Smelting and Refining on Nonferrous Metals 

3351-3357 Rolling, Drawing, and Extruding of Nonferrous Metals 

3363-3369 Nonferrous Foundries (Castings) 

3398, 3399 Miscellaneous Primary Metal Products 

B. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) Identify where all of the following activities 

may be exposed to stormwater: storage or disposal of wastes such as spent 

solvents or baths, sand, slag or dross; liquid storage tanks or drums; processing 

areas including pollution control equipment (e.g., baghouses); and, raw material 

storage areas such as coal, coke, scrap, sand, fluxes, refractories or metal in any 

form. In addition, indicate where an accumulation of significant amounts of 

particulate matter could occur from such sources as furnace or oven emissions, 

losses from coal or coke handling operations, etc., and which process or material 

storage procedure could result in a discharge of pollutants to waters of the State. 

2. Potential Pollutant Inventory of Exposed Material. (See also Part V(D)(4).) The 

inventory must include exposed materials handled at the site that potentially may 

be exposed to stormwater. Particulate matter from process air emissions or losses 

during material handling activities must be documented and evaluated. 

3. Inspections. (See also Part V(I).) Routine quarterly inspections must address all 

potential sources of pollutants, including (if applicable) air pollution control 

equipment (e.g., bag-houses and electrostatic precipitators, scrubbers and 

cyclones). The inspector shall look for any signs of degradation (e.g., leaks, 

corrosion or improper operation) that could limit the efficiency of the air pollution 

control equipment and lead to excessive or fugitive emissions. To reduce the 

potential for fugitive emissions consider monitoring air flow at inlets and outlets 

Inspections. (See also Part V(I).) Routine quarterly inspections must address all 

potential sources of pollutants, including (if applicable) air pollution control 

equipment (e.g., bag-houses and electrostatic precipitators, scrubbers and 

cyclones). The permittee appointed inspector shall look for any signs of 

degradation (e.g., leaks, corrosion or improper operation) that could limit the 

efficiency of the air pollution control equipment and lead to excessive or fugitive 
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emissions. To reduce the potential for fugitive emissions consider monitoring air 

flow at inlets and outlets or use equivalent measures to check for leaks resulting 

from particulate deposition or from blockage in ducting systems. Also inspect all 

process and material handling equipment such as conveyors, cranes and vehicles 

for leaks, drips or the potential loss of material as well as material storage areas 

including piles, bins or hoppers used for the storage of coke, coal, scrap or slag. 

Chemicals stored in tanks and drums shall be inspected for signs of material 

losses caused by wind or stormwater runoff. 

4. Good Housekeeping Measures. (See also Part V(D)(9)(a).) Perform good 

housekeeping including cleaning all impervious areas where particulate matter, 

dust or debris may accumulate. The permittee shall address material loading and 

unloading; material storage, handling and processing; and, paved areas where 

vehicle traffic or material is stored. These areas must be inspected weekly and 

sweeping must be conducted if there is a visible amount of material on the 

impervious surface. For unpaved areas where sweeping is not an effective 

housekeeping measures, the permittee shall implement measures such as sediment 

traps, vegetative buffer strips, filter fabric fencing, sediment filtering booms, 

gravel outlet protection or other equivalent measures effectively which trap or 

remove sediment and prevent the discharge of pollutants to a surface water. 

C. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix G 

Sector G - Metal Mining (Ore Mining and Dressing) 

A. Covered Stormwater Discharges. The requirements for Sector G apply to stormwater 

discharges from active, temporarily inactive and inactive metal mining and ore 

dressing facilities, including mines abandoned on Federal Lands, as identified by the 

SIC Codes specified below. Coverage is required for facilities that discharge 

stormwater contaminated by contact with or that have come into contact with any 

overburden, raw material, intermediate product, finished product, by-product, or 

waste product located on the site of the operation. 

SECTOR G: METAL MINING (ORE MINING AND DRESSING)

1011 Iron Ores 

1021 Copper Ores 

1031 Lead and Zinc Ores 

1041, 1044 Gold and Silver Ores 

1061 Ferroalloy Ores, Except Vanadium 

1081 Metal Mining Services 

1094, 1099 Miscellaneous Metal Ores 

1. Covered Discharges from Inactive Facilities: All stormwater discharges. 

2. Covered Discharges from Active and Temporarily Inactive Facilities: Only 

stormwater discharges from the following activities and areas are covered: waste 

rock, overburden piles if composed entirely of stormwater that is not combined 

with mine drainage; topsoil piles; off-site haul and access roads; onsite haul and 

access roads constructed of waste rock, overburden, or spent ore if composed 

entirely of stormwater that is not combined with mine drainage; onsite haul and 

access roads not constructed of waste rock and overburden, spent ore except if 

mine drainage is used for dust control; runoff from tailings dams, or dikes when 

not constructed of waste rock or tailings and no process fluids are present; runoff 

from tailings dams or dikes when constructed of waste rock or tailings if no 

process fluids are present, if composed entirely of stormwater that is not 

combined with mine drainage; concentration building if no contact with material 

piles; mill site, if no contact with material piles; office or administrative building 

and housing if mixed with stormwater from industrial area; chemical storage 

area(s); docking facility if no excessive contact with waste product that would 

otherwise constitute mine drainage; explosive storage; fuel storage; vehicle and 

equipment maintenance area and building; parking areas (if necessary); power 

plant; truck wash areas if no excessive contact with waste product that would 

otherwise constitute mine drainage; unreclaimed, disturbed areas outside of active 

mining area; reclaimed areas released from reclamation bonds prior to December 

17, 1990; and, partially or inadequately reclaimed areas or areas not released from 

reclamation bonds. 
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B. Limitations on Coverage. This General Permit does not authorize stormwater 

discharges from active metal mining facilities which are subject to effluent limitation 

guidelines for the Ore Mining and Dressing Point Source Category (40 CFR Part 

440), adit drainage and contaminated springs or seeps. (See Part I(E).) 

Note: discharges that come in contact with overburden or waste rock are subject to 40 

CFR Part 440, providing the discharges drain to a point source (either naturally or as a 

result of intentional diversion) and they combine with “mine drainage” that is otherwise 

regulated under the Part 440 regulations. Discharges from overburden or waste rock can 

be covered under this permit if they are composed entirely of stormwater, and do not 

combine with sources of mine drainage that are subject to 40 CFR Part 440, and meet 

other eligibility criteria contained in Part I(B)(3). 

C. Definitions. The following definitions are not intended to supersede or affect the 

definitions of active and inactive mining facilities in 06-096 CMR 200. 

1. Mining Operation. Typically consists of three phases, any one of which 

individually qualifies as a “mining activity.” The phases are the exploration and 

construction phase, the active phase, and the reclamation phase. 

2. Exploration and Construction Phase. Entails exploration and land disturbance 

activities to determine the financial viability of a site. Construction includes the 

building of site access roads and removal of overburden and waste rock to expose 

mineable minerals. 

3. Active Phase. Activities including each step from extraction through the 

production of a salable product. 

4. Reclamation Phase. Activities intended to return the land to its pre-mining use. 

5. Active Metal Mining Facility. A place where work or other activity related to the 

extraction, removal or recovery of metal ore is conducted. For surface mining 

operations, this active metal mining facility definition does not include any land 

where grading has returned the earth to a desired contour and reclamation has 

commenced. 

6. Inactive Metal Mining Facility. A site or portion of a site where metal mining 

and/or milling occurred in the past, but is not an active facility as defined above, 

and where the inactive portion is not covered by an active mining permit issued 

by the applicable State or Federal government agency. 

7. Temporarily Inactive Metal Mining Facility. A site or portion of a site where 

metal mining and/or milling occurred in the past but is currently inactive, and the 

facility is covered by an active mining permit issued by the applicable State or 

Federal government agency. 

D. Clearing, Grading and Excavation Activities. Clearing, grading and excavation 

activities conducted as part of the exploration and construction phase of a mining 
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operation may be covered under this General Permit provided that the activities meet 

the requirements of Maine’s Construction General Permit (MCGP). 

E. Cessation of Earth Disturbing Activities. If the exploration phase involves clearing, 

grading and excavation activities and no further mining activities will occur at the 

site, the permittee shall comply with the requirements for terminating the 

Construction General Permit, (i.e., stabilize and revegetate the disturbed land), the 

permittee shall submit a Notice of Termination, etc. If active mining activities will 

continue, the permittee shall apply for coverage under this General Permit for 

associated stormwater discharges and be prepared to implement any new 

requirements prior to beginning of the active phase. Although recommended that the 

permittee terminates coverage under the Construction General Permit, it is not 

mandatory. If the permittee does not to terminate the construction General Permit, 

he/she will be responsible for complying with all permit conditions of the 

construction permit, in addition to those of this General Permit. 

F. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) The permittee shall identify the following: 

mining or milling site boundaries; access and haul roads; drainage boundary areas 

of each stormwater outfall and the types of discharges from the drainage areas; 

equipment storage, fueling and maintenance areas; materials handling areas; 

outdoor manufacturing, storage or material disposal areas; chemicals and 

explosives storage areas; overburden, materials, soils or waste storage areas; 

location of where water leaves mine or other process water; existing and proposed 

tailings piles, ponds; heap leach pads; off-site points of discharge for process 

water; surface waters; and, boundary of tributary areas that are subject to effluent 

limitations guidelines in 40 CFR Part 440. 

2. Potential Pollutant Sources and Exposed Materials. (See Part V(D)(4).) For each 

area of the mine or mill site where stormwater discharges associated with 

industrial activities occur, the permittee shall identify the types of pollutants (e.g., 

heavy metals or sediment) likely to be present in significant amounts. Consider 

these factors: the mineralogy of the ore and waste rock (e.g., acid forming); 

toxicity and quantity of chemicals used, produced or discharged; the likelihood of 

contact with stormwater; vegetation of site (if any); and, any history of leaks or 

spills of toxic or hazardous pollutants. Also include a summary of any existing 

ore, waste rock or overburden characterization data and test results for the 

potential generation of acid rock. If any new data is acquired due to changes in 

ore type being mined, the SWPPP must be updated with characterization and acid 

rock data. 

3. Stormwater Management Controls. (See also Part V(D)(8).) The permittee shall 

consider each of the following BMPs. The potential pollutants identified in this 

Appendix shall determine the priority and appropriateness of the BMPs selected. 

If the permittee determines that one or more of these BMPs are not appropriate for 

the facility, the permittee is to explain why they are not appropriate. If BMPs are 
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implemented or planned but are not listed here (e.g., substituting a less toxic 

chemical for a more toxic one), include descriptions of the Best Management 

Practices in the SWPPP. 

a. Stormwater Diversions. Divert stormwater away from potential pollutant 

sources. Stormwater diversion options include: interceptor or diversion 

controls (e.g., dikes, swales, curbs or berms); pipe slope drains; subsurface 

drains; conveyance systems (e.g., channels or gutters, open top box culverts 

and waterbars; rolling dips and road sloping; roadway surface water deflector, 

and culverts); or their equivalents. 

b. Sediment and Erosion Control. (See also Part V(D)(9)(b).) For active and 

temporarily inactive sites consider a range of erosion controls within the broad 

categories of: flow diversion (e.g., swales); stabilization (e.g., temporary or 

permanent seeding); and, structural controls (e.g., sediment traps, dikes, silt 

fences). 

c. Capping. When capping is a necessary BMP to minimize pollutant discharges 

in stormwater, identify the source being capped as well as the material used to 

construct the cap. 

d. Treatment. Active and inactive mining sites must protect water quality using 

BMPs. Describe the type and location of Stormwater treatment. Treatment 

may consist of chemical or physical systems, oil water separators, or artificial 

wetlands. 

4. Inspections. (See also Part V(I).) Active mining sites must be inspected monthly. 

Temporarily inactive sites must be inspected quarterly unless adverse weather 

conditions make the site inaccessible. Inactive mining sites must be inspected 

annually. If annual site inspections are not be practical due to inaccessibility such 

as the access road being impassable by vehicular means, the Department will 

permit inspections to be conducted once every 3 years. The SWPPP must include 

documentation as to why annual inspections are not possible. 

G. Certification of Discharge Testing. (See also Part V(I)(1)(f) and Part I(F).) Testing is 

required to evaluate the presence of specific mining-related non-stormwater 

discharges such as seeps or adit discharges. If applicable, the permittee may certify in 

the SWPPP that a particular discharge comprised of commingled stormwater and 

non-stormwater is covered under a separate MEPDES permit. In doing so, the permit 

subjects the non-stormwater portion to effluent limitations prior to any commingling. 

This certification shall identify the non-stormwater discharges, the applicable 

MEPDES permit(s), the effluent limitations placed on the non-stormwater discharge 

by the permit(s), and the points at which the limitations are applied. 
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H. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix H 

Sector H - Coal Mines and Coal Mining Related Facilities.

A. Covered Stormwater Discharges. The requirements for Sector H apply to stormwater 

discharges from Coal Mines and Coal Mining Related facilities as identified by the 

SIC Codes specified below. 

SECTOR H: COAL MINES AND COAL MINING RELATED FACILITIES

1221-1241 Coal Mines and Coal Mining-Related Facilities 

B. Limitations on Coverage. (See also Part I (E-F.) This General Permit does not 

authorize discharges from pollutant seeps or underground drainage from inactive coal 

mines; refuse disposal areas that do not result from precipitation events; and, 

discharges from floor drains in maintenance buildings and other similar drains in 

mining and preparation plant areas. 

C. Authorized Non-Stormwater Discharges. Discharges Subject to Stormwater Effluent 

Guidelines. See Part I (B)(3)(c) for guidelines on stormwater discharges associated 

with coal pile runoff. 

D. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Other Applicable Regulations. Most active coal mining-related areas (SIC Codes 

1221-1241) are subject to sediment and erosion control regulations promulgated 

by the U.S. Office of Surface Mining (OSM). OSM enforces the Surface Mining 

Control and Reclamation Act (SMCRA). OSM has granted authority to most coal 

producing states to implement SMCRA through State SMCRA regulations. All 

SMCRA requirements regarding control of stormwater-related pollutant 

discharges must be addressed in the SWPPP either directly or by reference. 

2. Site Map. (See Part V(D)(3).) The permittee must indentify any areas containing 

acidic spoil, refuse or unclaimed disturbed areas and liquid storage tanks 

containing caustics, hydraulic fluids and lubricants on the site drainage map. This 

applies to all mining related activities as described in this Appendix. 

3. Potential Pollutant Sources and Exposed Materials. (See Part V(D)(4).) The 

permittee shall describe the following material and product sources and activities 

that may contain potential pollutants: truck traffic on haul roads resulting in the 

generation of sediment runoff and dust generation; fuel or other liquid storage; 

pressure lines containing slurry, hydraulic fluid or other potential harmful liquids; 

and, loading or temporary storage of acidic refuse or spoil. 

4. Stormwater Management Controls. (See Part V(9)(b).) As indicated in F(1) of 

this Appendix, SMCRA requires that sediment and erosion control measures are 

in place. Sediment and erosion control measures are primary requirements of the 

SWPPP for mining-related areas subject to SMCRA authority. Most active coal 

mining-related areas (SIC Codes 1221-1241) are subject to sediment and erosion 
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control regulations promulgated by the U.S. Office of Surface Mining (OSM). 

OSM enforces the Surface Mining Control and Reclamation Act (SMCRA). 

OSM has granted authority to most coal producing states to implement SMCRA 

through State SMCRA regulations. All SMCRA requirements regarding control 

of stormwater-related pollutant discharges must be addressed in the SWPPP either 

directly or by reference. 

5. Inspections of Active Mining-Related Areas and Inactive Areas under SMCRA 

Bond Authority. (See also Part V(I).) Quarterly inspections of areas covered by 

this permit corresponding with the inspections as performed by SMCRA 

inspectors of all mining-related areas are required by SMCRA. The permittee 

also maintains the records created by the SMCRA authority representative. The 

following areas must be inspected: haul and access roads; railroad spurs, sliding 

and internal hauling lines; conveyor belts, chutes and aerial tramways; equipment 

storage and maintenance yards; coal handling buildings / structures; and, inactive 

mines and related areas. 

6. Good Housekeeping. (See also Part V(D)(9)(a).) Implement measures to 

minimize dust generation by using sweepers; covering storage piles; watering 

haul roads and, conserving vegetation wherever possible to minimize erosion. 

7. Preventive Maintenance. (See also Part V(D)(9)(a).) Inspections of fuel, 

lubricant, hydraulic fluid and slurry storage tanks must be performed to prevent 

leaks due to deterioration or faulty connections. Other equivalent measures such 

as tank and line testing may be performed as a supplement to visual inspection 

methods. 

E. Monitoring and Reporting Requirements. (See Also Part VI.)

1. Numeric Monitoring Requirements must be performed if 30 cubic yards or more 

of coal is stored onsite. Samples must be collected at the point of discharge from 

material storage. The permittee shall collect at least two (2) samples and analyze 

the sample for TSS and pH. If the average of the two samples for either 

parameter does not exceed the effluent limitation, the monitoring requirements are 

fulfilled for that parameter for the permit year. If the average of the two samples 

exceeds the effluent limitations for either parameter, the permittee shall review 

the selection, design and implementation of control measures, complete a 

corrective action report and notify the Department within 14 days of exceedance. 

Upon making any necessary modifications, the permittee shall collect and analyze 

two additional samples for the parameter that exceeded the effluent limitation. 

Additional monitoring may be required. 
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If the values of the first three years of numeric effluent limit monitoring does 

not exceed the numeric limitation for any parameter, numeric monitoring 

may be reduced to once a year for the remainder of the permit term. 

NUMERIC LIMITATIONS FOR COAL PILE RUNOFF 

Parameter Limit Sample Type 

Total Suspended Solids (TSS) 50 mg/L, max Grab 

pH 6.0-9.0 min. and max Grab 

2. Visual Monitoring Requirements. Visual monitoring must be conducted quarterly 

during a qualifying storm event. Collect a grab sample for visual monitoring 

analysis from each outfall that has an associated industrial activity within the 

outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with 

and can demonstrate participation in the implementation of an established 

Department Approved Watershed Management Plan; or if the facility is 

conducting Benchmark, Impaired Waters sampling and analysis, or Numeric 

Monitoring for Total Suspended Solids (TSS). Visual monitoring is only waived 

for the outfall(s) associated with Numeric Monitoring. The permittee shall 

conduct quarterly visual monitoring at outfalls that do not require Numeric 

Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix I 

Sector I - Oil and Gas Extraction and Refining 

A. Covered Stormwater Discharges. The requirements in for Sector I apply to 

stormwater discharges from Oil and Gas Extraction and Refining facilities as 

identified by the SIC Codes specified below. 

SECTOR I: OIL AND GAS EXTRACTION AND REFINING

1311 Crude Petroleum and Natural Gas 

1321 Natural Gas Liquids 

1381-1389 Oil and Gas Field Services 

2911 Petroleum Refineries 

B. Limitations on Coverage. (See also Part I(E).) This General Permit does not 

authorize contaminated stormwater discharges from petroleum refining or drilling 

operations that are subject to guidelines found at 40 CFR Parts 419 and 435, 

respectively. Most contaminated discharges at petroleum refining and drilling 

facilities are subject to these effluent guidelines and are not eligible for coverage by 

this permit. The following non-stormwater discharges are not authorized by this 

permit: vehicle and equipment wash water and tank cleaning operations. 

C. Clearing, Grading and Excavation Activities. Clearing, grading and excavation 

activities conducted as part of the exploration and construction phase may be covered 

under this General Permit provided that the activities meet the requirements of 

Maine’s Construction General Permit (MCGP), this includes an Erosion and 

Sediment Control Plan which must be submitted to the Department for review and 

approval. 

D. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. Identify where any of the following may be exposed to stormwater: 

Reportable Quantity (RQ) releases; locations used for the treatment, storage or 

disposal of wastes; processing areas and storage areas; chemical mixing areas; 

construction and drilling areas; all areas subject to the effluent guidelines 

requirements for “No Discharge” in accordance with 40 CFR 435.32; and, the 

structural controls to achieve compliance with the “No Discharge” requirements. 

2. Potential Pollutant Sources and Exposed Materials. The permittee shall describe 

the following sources and activities that have potential pollutants associated with 

them: chemical, cement, mud or gel mixing activities; drilling or mining 

activities; and, equipment cleaning and rehabilitation activities. In addition, 

include information about the RQ release that triggered the permit application 

requirements including; the nature of release (e.g., spill of oil from a drum storage 

area); the amount of oil or hazardous substance released; amount of substance 

recovered; date of the release; cause of the release (e.g., poor handling techniques 

and lack of containment in the area); areas affected by the release (i.e., land and 
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water); procedure to clean up release; actions or procedures implemented to 

prevent or improve response to a release; and, remaining potential contamination 

sources of stormwater from release. The permittee shall take into account human 

health risks, the control of drinking water intakes and the designed uses of the 

receiving water in the RQ release report. 

3. Stormwater Management. The site description must include the nature of the 

exploration activity; estimates of the total site area and disturbed areas impacted 

by exploration activity; an estimate of the runoff coefficient of the site; a site 

drainage map, including approximate slopes; and, the name of all receiving 

waters. All sediment and erosion control measures must be inspected once every 

seven (7) days. The permittee shall describe and implement vegetative practices 

designed to preserve existing vegetation (where attainable) and re-vegetate open 

areas as soon as practicable after grade drilling. Consider the following 

equivalent measures: temporary or permanent seeding; mulching, sod 

stabilization, vegetative buffer strips; and, tree protection practices. The 

implementation of re-vegetative measures in disturbed areas must begin within 14 

days of activity or as soon as the growing season will permit. 

4. Inspections. Inspect all equipment weekly and areas addressed in the SWPPP 

every 6 months for active sites. Routinely (but not less than monthly) inspect 

equipment and vehicles which store, mix (including all on and offsite mixing 

tanks) or transport chemicals or hazardous materials, including those transporting 

supplies to oil field activities. Temporarily or permanently inactive oil and gas 

extraction facilities that are unstaffed must perform the inspections at least 

annually. 

5. Good Housekeeping Measures. Perform frequent inspections of all control 

measures and remove accumulated materials from travel ways and stormwater 

conveyances. 

6. Vehicle and Equipment Storage Areas. Inspect Vehicles and equipment to ensure 

they are properly maintained and operating effectively. Any designated vehicle 

and equipment maintenance area must be identified on the site map. The 

permittee shall describe and implement measures to eliminate or minimize 

contaminants. A spill kit, drip pans and other measures must be located on any 

active site. 

7. Material and Chemical Storage Areas. Maintain material and chemical storage 

areas in good condition to prevent contamination of stormwater. Plainly label all 

hazardous materials. 
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E. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix J 

Sector J - Mineral Mining and Dressing. 

A. Covered Stormwater Discharges. The requirements for Sector J apply to stormwater 

discharges from active and inactive mineral mining and dressing facilities as 

identified by the SIC Codes specified below. 

SECTOR J: MINERAL MINING AND DRESSING

1411 Dimension Stone 

1422, 1429 Crushed and Broken Stone, Including Riprap 

1442, 1446 Sand and Gravel 

1455, 1459 Clay, Ceramic, and Refractory Materials 

1474-1479 Chemical and Fertilizer Mineral Mining 

1481 Nonmetallic Minerals Services, Except Fuels 

1499 Miscellaneous Nonmetallic Minerals, Except Fuels 

B. Limitations of Coverage. (See also Part I(E).) The only non-stormwater discharge 

covered under this General Permit is mine dewatering discharges composed entirely 

of stormwater or uncontaminated ground water seepage from construction sand and 

gravel activities and industrial sand, and crushed stone mining facilities. Other 

stormwater discharges subject to an existing effluent limitation guideline contained in 

40 CFR Part 436 are not authorized by this General Permit. 

C. Definitions. The following definitions are not intended to supersede the definitions of 

active and inactive mining facilities established in 06-096 CMR 200. 

1. Mining Operation. This typically consists of three-phases, any one of which 

individually qualifies as a “mining activity.” The phases are the exploration and 

construction phase, the active phase, and the reclamation phase. 

2. Exploration and Construction Phase. This entails exploration and land 

disturbance activities to determine the financial viability of a site. Construction 

includes the building of site access roads and the removal of overburden and 

waste rock to expose mineable minerals. 

3. Active Phase. This includes activities associated with each step from extraction 

through production of a salable product. 

4. Reclamation phase. This includes activities intended to return the land to a premined state. 

5. Active Mineral Mining Facility. A location where work or other activity related 

to the extraction, removal or recovery of minerals is conducted. 

6. Inactive Mineral Mining Facility. A site or portion of a site where mineral mining 

or dressing occurred in the past but is not an active facility as defined above, and 

where the inactive portion is not covered by an active permit issued by the 

applicable State or Federal government agency. 
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7. Temporarily Inactive Mineral Mining Facility. A site or portion of a site where 

mineral mining and/or dressing occurred in the past but currently are not being 

actively undertaken, and the facility is covered by an active mining permit issued 

by the applicable State or Federal government agency. 

8. Clearing, Grading and Excavation Activities. Clearing, grading and excavation 

activities conducted as part of the exploration and construction phase of a mineral 

mining operation may be covered under this General Permit provided that the 

activities meet the requirements of Maine’s Construction General Permit 

(MCGP). This includes the submittal of an erosion and sedimentation control 

plan for review and approval. 

D. Cessation of Exploration and Construction Activities. If the exploration phase of 

clearing, grading and excavation activities are completed and no further mining 

activities will occur at the site, the permittee shall comply with the requirements for 

terminating permit coverage, by stabilizing and revegetating the disturbed land, and 

by submitting a Notice of Termination. If active mining operations will continue, the 

permittee shall remain covered under this General Permit for the stormwater 

discharges unless the pit and all associated activities are internally drained. If the pit 

and all associated activities are internally drained, no permit coverage is required 

under this General Permit and the permittee shall submit a Notice of Termination to 

the Department. 

E. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Inspections. (See also Part V(I).) The permittee shall conduct quarterly visual 

inspections of all BMPs at active mining facilities. At temporarily or permanently 

inactive facilities, annual inspections must be performed. The inspection program 

shall include: an assessment of the integrity of stormwater discharge diversions, 

conveyance systems, sediment control and collection systems and containment 

structures; inspections to determine if soil erosion has occurred at, or as a result of 

failed structural or vegetative BMPs, serrated slopes and benched slopes. The 

permittee shall conduct inspections of material handling and storage areas and 

other potential sources of pollutants for evidence of actual or potential discharges 

of contaminated stormwater. 

2. Good Housekeeping. Perform frequent inspections of all control measures and 

remove accumulated materials in travel ways and stormwater conveyances. Good 

housekeeping procedures must be documented in the facility’s SWPPP. 

3. Material containment: Aggregate and other material storage piles must be 

contained to designated areas by structural means or by daily pile maintenance. 

Structural containment may include earthen berms, wood, concrete or metal 

barriers to prevent drifting and tracking of the material. 

F. Numeric Monitoring Requirements. These requirements for non-stormwater 

discharges must be performed during mine dewatering activities. Samples must be 

collected from the point of discharge for this activity. If mine dewatering activities 
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are separated by seven (7) days or greater, the permittee shall collect at least two (2) 

samples and analyze the sample for TSS and pH. The permittee shall calculate the 

average for TSS and pH to determine an average monitoring value for each 

parameter. If the average of the two (2) samples for either parameter does not 

exceed the numeric effluent limitation, the monitoring requirements are fulfilled for 

the permit year. If the average of the two (2) samples exceeds the numeric effluent 

limitation for either parameter, the permittee shall review the selection, design and 

implementation of control measures, complete a corrective action report and notify 

the Department within 14 days of receiving the monitoring results. Upon making any 

necessary modifications, the permittee shall collect and analyze two (2) additional 

samples for any parameter that exceeded the numeric limit. Additional monitoring 

may be required. If a facility is required to conduct analytical monitoring for TSS 

and pH under 06-096 CMR 378, or other Department license and the numeric 

limitation is at least as strict as the numeric monitoring in this General Permit those 

parameters are waived. 

If the values of the first three years of numeric effluent limit monitoring does not 

exceed the numeric limitation for any parameter, numeric monitoring may be 

reduced to once a year for the remainder of the permit term.

SECTOR J: MINERAL MINING AND DRESSING SECTOR-SPECIFIC NUMERIC 

LIMITATIONS 

Regulated Activity Parameter Numeric Limitation 

Mine Dewatering Activities from Crushed and Broken 

Stone Facilities (SIC 1422-1429)

TSS 

pH

100.0 mg/L, daily max 

6.0-9.0

Mine Dewatering Activities from Sand and Gravel 

Mining Facilities (SIC 1442, 1446) 

TSS 

pH 

45 mg/L daily max 

6.0-9.0 s.u. 

G. Visual Monitoring Requirements. (See also VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Numeric Monitoring or Impaired Waters 

sampling is ceased.
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Appendix K 

Sector K - Hazardous Waste Treatment, Storage or Disposal Facilities. 

A. Covered Stormwater Discharges. The requirements for Sector K apply to stormwater 

discharges from Hazardous Waste Treatment, Storage or Disposal facilities as 

identified by the Activity Code specified below, including those that are operating 

under interim status or a permit under Subtitle C of RCRA. 

SECTOR K: HAZARDOUS WASTE TREATMENT, STORAGE, 

AND DISPOSAL FACILITIES

HZ Hazardous Waste Treatment, Storage or Disposal 

B. Limitations on Coverage. This General Permit does not authorize stormwater 

discharges from: leachate, gas collection condensate, drained free liquids, 

contaminated ground water, laboratory-derived wastewater and wash water from 

truck and railcar washing and surface areas which have come in direct contact with 

solid waste at the facility. 

C. Definitions.

1. Contaminated Stormwater. Stormwater which comes in direct contact with 

landfill wastes, the waste handling and treatment areas, or landfill wastewater. 

Some specific areas of a landfill that may produce contaminated stormwater 

include (but are not limited to): the open face of an active landfill with exposed 

waste (no cover added); the areas around wastewater treatment operations; trucks, 

equipment or machinery that has been in direct contact with the waste; and, waste 

dumping areas. 

2. Drained Free Liquids. Aqueous wastes drained from waste containers (e.g., 

drums, etc.) prior to landfilling. 

3. Land Treatment Facility. A facility or part of a facility at which hazardous waste 

is applied onto or incorporated into the soil surface. If the waste remains after site 

closure, the facility is considered a disposal facility. 

4. Landfill. An area of land or an excavation in which wastes are placed for 

permanent disposal, that is not a land application or land treatment unit, surface 

impoundment, underground injection well, waste pile, salt dome formation, a salt 

bed formation, an underground mine or a cave as these terms are defined in 40 

CFR 257.2, 258.2 and 260.10. 

5. Landfill Wastewater. As defined in 40 CFR Part 445 (Landfills Point Source 

Category) all wastewater associated with, or produced by, landfilling activities 

except for sanitary wastewater, non-contaminated stormwater, contaminated 

groundwater, and wastewater from recovery pumping wells. Landfill wastewater 

includes, but is not limited to, leachate, gas collection condensate, drained free 

liquids, laboratory derived wastewater, contaminated stormwater and contact 

wash water from washing truck, equipment, and railcar exteriors and surface areas 

which have come in direct contact with solid waste at the landfill facility. 
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6. Leachate. Liquid that has passed through or emerged from solid waste and 

contains soluble, suspended, or miscible materials removed from such waste. 

7. Non-Contaminated Stormwater. Non-contaminated stormwater includes 

stormwater which flows off the cap, cover, intermediate cover, daily cover, or 

final cover of the landfill. This includes drainage which does not come into direct 

contact with landfill wastes, the waste handling and treatment areas, or landfill 

wastewater. 

8. Pile. Any non-containerized accumulation of solid, non-flowing hazardous waste. 

9. Surface Impoundment. A surface impoundment is a natural topographic 

depression, man-made excavation, or diked area formed of earthen materials. A 

surface impoundment may be lined with manmade materials designed to hold an 

accumulation of liquid waste or waste containing free liquids. Injection wells are 

not considered surface impoundments. Examples of surface impoundments 

include: holding, storage and settling ponds and aeration pits, ponds and lagoons. 

D. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. Identify where any of the following may be exposed to stormwater: 

locations where open dumping is occurring or has occurred, locations of 

hazardous waste containment or treatment areas, locations of any known leachate 

springs or other areas where uncontrolled leachate may commingle with runoff, 

leachate collection and handling systems, and areas where construction of new 

containment areas is being performed or anticipated in the coming year. 

2. Potential Pollutant Sources and Exposed Materials. The permittee shall describe 

the following sources and activities that have potential pollutants associated with 

them: fertilizer, herbicide and pesticide application; earth moving (including 

construction activities); waste hauling and loading and unloading; outdoor storage 

of significant materials including daily, interim and final cover material stockpiles 

as well as temporary waste storage areas; exposure of active and inactive landfill 

and land application areas; uncontrolled leachate flows; and. failure or leaks from 

leachate collection and treatment systems. 

3. Stormwater Management Control. Provide temporary stabilization which may 

include temporary seeding, mulching and geotextile placement on inactive 

portions of stockpiled materials consisting of daily, intermediate and final cover. 

For inactive areas of the landfill or open dump that have final covers but where 

vegetation has failed to established, the permittee must establish final vegetative 

cover. 

4. Inspections. (Also see Part V(I).) Inspections of active sites Operating landfills, 

open dumps and land application sites must be inspected at least once every seven 

(7) days. Focus on areas of landfills which have not yet been finally stabilized; 

active land application areas; areas used for storage of material or wastes exposed 

to stormwater, stabilization, and structural control measures; leachate collection 

and treatment systems; and locations where equipment and waste trucks enter or 
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exit the site. Inspect the erosion and sediment control measures for effective 

operation. Conduct monthly inspections of stabilized sites and areas where land 

application has been completed. 

Inspections of Inactive Sites. (Also see Part V(I).) Inspect inactive landfills, open 

dumps, and land application sites on a quarterly basis. Qualified personnel shall 

inspect landfill or open dump stabilization, structural erosion control measures, 

and leachate collection and treatment systems, associated with closed land 

application areas. 

5. Preventative Maintenance Program. This program includes: the inspection and 

maintenance of all containers used for outdoor chemical or significant materials 

storage to prevent leakage; inspect and maintain all elements of leachate 

collection and treatment systems to prevent the commingling of leachate with 

stormwater; and, ascertain that the integrity and effectiveness of any intermediate 

or final cover is maintained. This includes repairing the cover as necessary to 

minimize the effects of settlement, sinking and erosion. 

6. Good Housekeeping. Perform good housekeeping including frequent 

management of all material handling or waste storage areas. This includes the 

removal of accumulated waste or other material located in travel ways and 

stormwater conveyances. Good housekeeping procedures must be included in the 

facility’s SWPPP. 

7. Material containment. All material storage piles must be contained to designated 

areas by structural means or by daily pile maintenance. Structural containment 

may include wooden, concrete or metal barriers to prevent drifting and tracking of 

the contained material. 

8. Recordkeeping and Internal Reporting. Implement a tracking system for the types 

of wastes disposed of in each cell or trench of a landfill or open dump. For land 

application sites, track the types and quantities of wastes applied in specific areas. 

9. Non-Stormwater Discharge Test Certification. The discharge test certification 

must be conducted for the presence of leachate and vehicle wash water. This test 

must be performed annually. 

E. Monitoring and Reporting Requirements. (See also Part VI.)

1. Numeric Monitoring. Numeric Monitoring must be performed quarterly unless 

otherwise instructed by the Department. The permittee shall collect at least two 

(2) samples and analyze the sample for the parameters listed below. If the 

average of the two (2) samples for any parameter does not exceed the numeric 

effluent limitation the monitoring requirements are fulfilled for that parameter for 

the permit year. If the average of the two (2) samples exceeds the effluent 

limitation for any parameter the permittee shall review the selection, design and 

implementation of control measures, complete a corrective action report and 

notify the Department within 14 days of the exceedance. Upon making any 

necessary modifications, the permittee shall collect and analyze two additional 
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samples for the parameter that exceeded the effluent limitation. Additional 

monitoring may be required. 

SECTOR K: HAZARDOUS WASTE TREATMENT, STORAGE, 

AND DISPOSAL FACILTIES 

SECTOR-SPECIFIC NUMERIC EFFLUENT LIMITATIONS

Activity 

Code

Regulated Activity 

(Discharges may be subject 

to requirements for more 

than one sector/subsector) 

Parameter Numeric Limitation* 

HZ ALL – Industrial 

Activity Code 

"HZ" Subject to the 

Provisions of 40 CFR 

Part 445 Subpart A 

BOD5

TSS 

Ammonia 

Alpha Terpineol 

Aniline 

Benzoic Acid 

Naphthalene 

p-Cresol 

Phenol 

Pyridine 

Arsenic (Total) 

Chromium (Total) 

Zinc (Total) 

pH 

220mg/L, daily max 

56 mg/L, monthly avg. max. 

88 mg/L, daily max 

27 mg/L, monthly avg. max. 

10 mg/L, daily max 

4.9 mg/L, monthly avg. max. 

0.024 mg/L, daily max 

0.019 mg/L, monthly avg. max. 

0.024 mg/L, daily max 

0.015 mg/L, monthly avg. max. 

0.119 mg/L, daily max 

0.073 mg/L, monthly avg. max. 

0.059 mg/L, daily max 

0.022 mg/L, monthly avg. max. 

0.024 mg/L, daily max 

0.015 mg/L, monthly avg. max. 

0.048 mg/L, daily max 

0.029 mg/L, monthly avg. max. 

0.072 mg/L, daily max 

0.025 mg/L, monthly avg. max. 

1.1 mg/L, daily max 

0.46 mg/L, monthly avg. max. 

1.1 mg/L daily max 

0.46 mg/L, monthly avg. max. 

0.535 mg/L, daily max 

0.296 mg/L, monthly avg. max. 

Within 6.0-9.0 s.u. 
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*These numeric limitations apply to contaminated stormwater discharges from hazardous 

waste landfills subject to the provisions of RCRA Subtitle C at 40 CFR Parts 264 

(Subpart N) and 265 (Subpart N) except for any of the facilities described below: 

(a) Landfills operated in conjunction with other industrial or commercial 

operations when the landfill only receives wastes generated by the industrial 

or commercial operation directly associated with the landfill; 

(b) Landfills operated in conjunction with other industrial or commercial 

operations when the landfill receives wastes generated by the industrial or 

commercial operation directly associated with the landfill and also receives 

other wastes provided the other wastes received for disposal are generated by 

a facility that is subject to the same provisions in 40 CFR Subchapter N as the 

industrial or commercial operation of the other wastes received are of similar 

nature to the wastes generated by the industrial or commercial operation; 

(c) Landfills operated in conjunction with Centralized Waste Treatment (CWT) 

facilities subject to 40 CFR Part 437 so long as the CWT facility commingles 

the landfill wastewater with other non-landfill wastewater for discharge. A 

landfill directly associated with a CWT facility is subject to this part if the 

CWT facility discharges landfill wastewater separately from other CWT 

wastewater or commingles the wastewater from its landfill only with 

wastewater from other landfills; or 

(d) Landfills operated in conjunction with other industrial or commercial 

operations when the landfill receives wastes from public service activities so 

long as the company owning the landfill does not receive a fee or other 

remuneration for the disposal service. 

2. Visual Monitoring Requirements. Visual monitoring must be conducted quarterly 

during a qualifying storm event. Collect a grab sample for visual monitoring 

analysis from each outfall that has an associated industrial activity within the 

outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with 

and can demonstrate participation in the implementation of an established 

Department Approved Watershed Management Plan; or if the facility is 

conducting Benchmark, Impaired Waters sampling and analysis, or Numeric 

Monitoring for Total Suspended Solids (TSS). Visual monitoring is only waived 

for the outfall(s) associated with Numeric Monitoring. The permittee shall 

conduct quarterly visual monitoring at outfalls that do not require Numeric 

Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix L 

Sector L - Landfills, Land Application Sites and Open Dumps 

A Covered Stormwater Discharges. The requirements for Sector L apply to stormwater 

discharges associated with industrial activity from Landfills and Land Application 

Sites and Open Dumps as identified by the Activity Codes specified below. This 

permit may authorize stormwater discharges for Sector L facilities associated with 

waste disposal at landfills, land application sites and open dumps that receive or have 

received industrial waste, including sites subject to regulation under Subtitle D of 

RCRA. Stormwater discharges associated with new cell construction are also 

covered for Sector L facilities provided that the new construction areas are addressed 

in the facility’s SWPPP. 

SECTOR L: LANDFILLS AND LAND APPLICATION SITES

LF Landfills, Land Application Sites, and Open Dumps 

B Limitations on Coverage. (See also Part I(E).) This General Permit does not 

authorize the following discharges: leachate, gas collection condensate, drained 

free liquids, contaminated ground water, laboratory wastewater, and contact wash 

water from washing truck and railcar exteriors and surface areas which have come 

in direct contact with solid waste at the landfill facility. 

C Definitions.

1. Contaminated Stormwater. Stormwater which comes in direct contact with 

landfill wastes, the waste handling and treatment areas, or landfill wastewater. 

Some specific areas of a landfill that may produce contaminated stormwater 

include (but are not limited to): the open face of an active landfill with exposed 

waste (no cover added); the areas around wastewater treatment operations; trucks, 

equipment or machinery that has been in direct contact with the waste; and, waste 

dumping areas. 

2. Drained Free Liquids. Aqueous wastes drained from waste containers (e.g., 

drums, etc.) prior to land filling. 

3. Landfill Wastewater. As defined in 40 CFR Part 445 (Landfills Point Source 

Category) is all wastewater associated with or produced by landfilling activities 

except for sanitary wastewater, non-contaminated stormwater, contaminated 

groundwater, and wastewater from recovery pumping wells. Landfill process 

wastewater includes, but is not limited to, leachate, gas collection condensate, 

drained free liquids, laboratory derived wastewater, contaminated stormwater and 

contact wash water from trucks, equipment and railcar exteriors and surface areas 

which have come in direct contact with solid waste at the landfill facility. 

4. Leachate. Liquid that has passed through or emerged from solid waste and 

contains soluble, suspended, or miscible materials removed from such waste. 
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5. Non-Contaminated Stormwater. Non-contaminated stormwater includes 

stormwater which flows off the cap, cover, intermediate cover, daily cover, or 

final cover of the landfill. This includes drainage which does not come into direct 

contact with landfill wastes, the waste handling and treatment areas, or landfill 

wastewater. 

D Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. Identify where any of the following may be exposed to stormwater: 

locations where open dumping is occurring or has occurred, locations of waste 

handling, containment or treatment areas, locations of any known seeps or other 

areas where uncontrolled leachate may commingle with runoff, leachate 

collection and handling systems, and areas where construction of new 

containment areas is being performed or anticipated in the coming year. 

2. Potential Pollutant Sources and Exposed Materials. The permittee shall describe 

the following sources and activities that have potential pollutants associated with 

them: fertilizer, herbicide and pesticide application; earth moving (including 

construction activities); waste hauling and loading and unloading; outdoor storage 

of significant materials including daily, interim, and final cover material 

stockpiles as well as temporary waste storage areas; exposure of active and 

inactive landfill and land application areas; uncontrolled leachate flows; and 

failure or leaks from leachate collection and treatment systems. 

3. Stormwater Management Control. Provide temporary stabilization which may 

include temporary seeding, mulching and geotextile placement on inactive 

portions of stockpiled materials consisting of daily, intermediate and final cover. 

For inactive areas of the landfill or open dump that have final covers but where 

vegetation has failed to established, the permittee must establish final vegetative 

cover. 

4. Inspections. Inspections of active sites (Also see Part V(I).) operating landfills, 

open dumps and land application sites must be inspected at least once every seven 

(7) days. Focus on areas of landfills that have not been closed out with final 

cover; active land application areas; areas used for stockpiling of soil for cover 

and liner material, or wastes exposed to stormwater, stabilization, and structural 

control measures; leachate collection and treatment systems; and locations where 

equipment and waste trucks enter or exit the site. Inspect the erosion and 

sediment control measures for effective operation. Conduct monthly inspections 

of stabilized sites and areas where land application has been completed. 

Inspections of Inactive Sites. (Also see Part V(I).) Inspect inactive landfills, open 

dumps, and land application sites on a quarterly basis. Qualified personnel shall 

inspect landfill or open dump stabilization, structural erosion control measures, 

and leachate collection and treatment systems, associated with closed land 

application areas. 
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5. Preventative Maintenance Program. This program includes: the inspection and 

maintenance of all containers used for outdoor chemical or significant materials 

storage to prevent leakage; inspect and maintain all elements of leachate 

collection and treatment systems to prevent the commingling of leachate with 

stormwater; and, ascertain that the integrity and effectiveness of any intermediate 

or final cover is maintained. This includes repairing the cover as necessary to 

minimize the effects of settlement, sinking and erosion. 

6. Good Housekeeping. Perform good housekeeping including frequent 

management of all material handling or waste storage areas. This includes the 

removal of accumulated waste or other material located in travel ways and 

stormwater conveyances. Good housekeeping procedures must be included in the 

facility’s SWPPP. 

7. Material containment. All material storage piles must be contained to designated 

areas by structural means or by daily pile maintenance. Structural containment 

may include wooden, concrete or metal barriers to prevent drifting and tracking of 

the contained material. 

8. Recordkeeping and Internal Reporting. Implement a tracking system for the types 

of wastes disposed of in each cell or trench of a landfill or open dump. For land 

application sites, track the types and quantities of wastes applied in specific areas. 

9. Non-Stormwater Discharge Test Certification. The discharge test certification 

must be conducted for the presence of leachate and vehicle wash water. This test 

must be performed annually. A description of the preventative measures used to 

insure that process waste water resulting from truck or equipment washing is 

discharged in accordance with MEPDES requirements must be included in the 

non-stormwater discharge certification statement. A copy of the manifest for 

trucking of waste water off site or a waste acceptance letter from the receiving 

treatment facility is acceptable if wastewater is hauled off site for disposal or 

treatment. If the process waste water is to be recycled on site, a description of the 

process must be included in the SWPPP. 

E Monitoring and Reporting requirements. (Also see Part VI.)

1. Numeric Monitoring. Numeric Monitoring must be performed quarterly unless 

otherwise instructed by the Department. The permittee shall collect at least two 

(2) samples and analyze the sample for the parameters listed below. If the 

average of the two (2) samples for any parameter does not exceed the numeric 

effluent limitation the monitoring requirements are fulfilled for that parameter for 

the permit year. If the average of the two (2) samples exceeds the effluent 

limitation for any parameter the permittee shall review the selection, design and 

implementation of control measures, complete a corrective action report and 

notify the Department within 14 days of the exceedance. Upon making any 

necessary modifications, the permittee shall collect and analyze two additional 

samples for the parameter that exceeded the effluent limitation. Additional 

monitoring may be required. 
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SECTOR L: LANDFILLS AND LAND APPLICATION SITES- 

 SECTOR SPECIFIC NUMERIC LIMITATIONS 

Activity 

Code 

Industrial Activity 

(Discharge may be subject to requirements for 

more than one sector/subsector) 

Parameter Numeric Limitation* 

LF All Landfills which are Subject to the Requirements of 

40 CFR Part 445 Subpart B 

BOD5 

TSS 

Ammonia 

Alpha Terpineol 

Benzoic Acid 

p-Cresol 

Phenol 

Zinc (Total) 

pH 

140 mg/L, daily max 

37 mg/L, monthly avg. max. 

88 mg/L, daily max 

27 mg/L, monthly avg. max. 

10 mg/L, daily max. 

4.9 mg/L, monthly avg. max. 

0.033 mg/L, daily max. 

0.016 mg/L, monthly avg. max. 

0.12 mg/L, daily max. 

0.071 mg/L, monthly avg. max. 

0.025 mg/L, daily max. 

0.014 mg/L, monthly avg. max. 

0.026 mg/L, daily max. 

0.015 mg/L, monthly avg. max. 

0.20 mg/L, daily max 

0.11 mg/L, monthly avg. max. 

Within the range of 6-9 pH units 

*As set forth at 40 CFR Part 445 Subpart B, these numeric limitations apply to 

contaminated storm water discharges from MSWLFs which have not been closed in 

accordance with 40 CFR 258.60, and contaminated storm water discharges from those 

landfills which are subject to the provisions of 40 CFR Part 257 except for discharges 

from any of facilities described in (a) through (d) below: 

(a) Landfills operated in conjunction with other industrial or commercial operations 

when the landfill only receives wastes generated by the industrial or commercial 

operation directly associated with the landfill; 

(b) Landfills operated in conjunction with other industrial or commercial operations 

when the landfill receives wastes generated by the industrial or commercial 

operation directly associated with the landfill and also receives other wastes 

provided the other wastes received for disposal are generated by a facility that is 

subject to the same provisions in 40 CFR Subchapter N as the industrial or 

commercial operation or the other wastes received are of similar nature to the 

wastes generated by the industrial or commercial operation;

(c) Landfills operated in conjunction with Centralized Waste Treatment (CWT) 

facilities subject 40 CFR Part 437 so long as the CWT facility commingles the 

landfill wastewater with other non-landfill wastewater for discharge. A landfill 

directly associated with a CWT facility is subject to this part if the CWT facility 

discharges landfill wastewater separately from other CWT wastewater or 
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commingles the wastewater from its landfill only with wastewater from other 

landfills; or

(d) Landfills operated in conjunction with other industrial or commercial operations 

when the landfill receives wastes from public service activities so long as the 

company owning the landfill does not receive a fee or other remuneration for the 

disposal service.

2. Visual Monitoring Requirements. Visual monitoring must be conducted quarterly 

during a qualifying storm event. Collect a grab sample for visual monitoring analysis 

from each outfall that has an associated industrial activity within the outfall’s 

drainage area. The outfall(s) must be sampled quarterly unless the facility has 

representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix M 

Sector M - Automobile Salvage Yards

A. Covered Stormwater Discharges. The requirements for Sector M apply to stormwater 

discharges associated with industrial activity from Automobile Salvage Yards as 

identified by the SIC Code specified below. Sector M permittees may be engaged in 

dismantling or wrecking used motor vehicles for parts recycling and for the resale of 

the parts or vehicles for scrap. 

SECTOR M: AUTOMOBILE SALVAGE YARDS

5015 Automobile Salvage Yards 

B. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) Identify all outfalls and areas where 

concentrated flow from industrial activity leaves the site. Identify areas of 

industrial activity including, but not limited to, vehicle or parts dismantling, 

vehicle storage, vehicle crushing and vehicle or parts maintenance. Also identify 

where any of the following may be exposed to stormwater: dismantling areas; 

parts (e.g., engine blocks, tires, hub caps, batteries, hoods, transmissions, and 

mufflers) storage areas; and, liquid storage tanks and drums for fuel and other 

fluids. 

2. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) 

Assess and describe the following pollutant-associated activities and areas which 

may impact stormwater: vehicle storage areas; dismantling areas; vehicle 

crushing; parts storage area(s) (e.g., engine blocks, tires, hub caps, batteries, 

hoods, mufflers, etc); fueling location(s); fuel and fluid removal from vehicles 

scheduled crushing or dismantling; and fluid storage. 

3. Stormwater Management Controls. (See also Part V(D)(8) and (9).) Implement 

the following best management practices to control stormwater such as berms or 

drainage swales on the upslope property line to reduce run-on from adjacent 

properties. Where possible store oily parts inside vehicles or buildings; minimize 

uncovered outdoor storage of oily parts (e.g., engine blocks) and install berms 

around above-ground liquid storage containers greater than 55 gallons. Install 

filtering devices such as an oil water separator and utilize drip pans, absorbent 

pads and booms. Whenever possible conduct vehicle maintenance inside storm 

resistant buildings. Each facility must have a spill kit that includes: absorbent 

material, absorbent pads, sausage booms, and personal protective safety 

equipment. This should include eye protection, rubber gloves, six millimeter 

“contractor” bags, duct tape and the DEP Emergency Spill Response Number 

800-482-0777. Depending on the facility, additional BMPs may be necessary to 

reduce pollutants. 

4. Inspections. (See also Part V(I).) Vehicles must be inspected for leaks upon 

arrival. All equipment containing oily parts, hydraulic fluids or any other types of 
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fluids must be inspected monthly. Inspect all fluid containers and containment 

areas monthly for signs of spills and leaks. All inspections must be documented 

in the SWPPP. If leaks are observed throughout the year the location and 

response action must be summarized in the annual report. 

Mercury switches must be removed from vehicles upon delivery to the yard or as 

soon thereafter as practicable. The switches must be stored in a covered 

Universal Hazardous Waste bucket and be located in an area designated as a 

“Universal Hazardous Storage Area.” A Maine Motor Vehicle Mercury Switch 

Log-Sheet must be kept onsite in the designated Universal Hazardous Waste area. 

C. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased.
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Appendix N 

Sector N - Scrap Recycling and Waste Recycling Facilities 

A. Covered Stormwater Discharges. The requirements for Sector N apply to stormwater 

discharges associated with industrial activity from Scrap Recycling and Waste 

Recycling facilities as identified by the SIC Codes specified below. 

SECTOR N: SCRAP RECYCLING FACILITIES

5093 Scrap Recycling Facilities 

B. Alternative Permit Coverage Requirements. Separate permit requirements are 

established for recycling facilities that only receive and transfer source-separated 

recyclable materials from non-industrial and residential sources. The sourceseparated materials include: common consumer products including paper, newspaper, 

glass, cardboard, plastic containers, aluminum and tin cans. These facilities do not 

require permit coverage under this General Permit unless the facility processes these 

materials on site. Recycling facilities commonly referred to as material recovery 

facilities (MRF) have separate permit requirements. 

C. Limitations on Coverage. (See also Part I(E).) This General Permit does not 

authorize non-stormwater discharges from turnings containment areas. Discharges 

from turnings containment areas are prohibited unless covered by a separate 

MEPDES permit. 

D. Additional SWPPP Requirement and Non-Numeric Technology Based Effluent 

Limit.

1. Site Map. (See also Part V(D)(3).) The permittee shall document the locations of 

any of the following activities or sources that may be exposed to stormwater: 

scrap and waste material storage, outdoor scrap and waste processing equipment; 

and containment areas for turnings exposed to cutting fluids. 

2. Quarterly Inspections. (See also Part V (I).) Inspections must be conducted on a 

quarterly basis. Inspections must include all areas such as where waste is stored 

generated, received, treated or disposed. 

3. Scrap and Waste Recycling Facilities (Non-Source Separated, Non-Liquid 

Recyclable Materials). The following requirements are for facilities that receive 

process waste and conduct wholesale distribution of non-liquid recyclable wastes 

including ferrous and nonferrous metals, plastics, glass, cardboard and paper. 

This type of facility may receive both non recyclable and recyclable materials. 

This sector is not intended for those facilities that only accept, sort and transfer 

recyclables from non-industrial and residential sources. 

4. Each facility must have a spill kit that includes: absorbent material, absorbent 

pads, sausage booms, and personal protective safety equipment. This should 

include eye protection, rubber gloves, six millimeter “contractor” bags, duct tape 
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and the DEP Emergency Spill Response Number 800-482-0777. Depending on 

the facility, additional BMPs may be necessary to reduce pollutants. 

Since there are a variety of scrap and waste recycling facilities which conduct 

various activities, please refer to the below listed facility type and activity for 

guidance. 

Inbound Recyclable and Waste Material Control Program. The permittee shall 

notify major suppliers of which scrap materials will not be accepted at the facility 

or materials which are only accepted under certain conditions. The facility must 

minimize the chance of accepting materials that are considered source-pollutants 

by conducting inspections of all inbound recyclables and waste materials. BMP 

options to consider: provide educational information to scrap and recyclable waste 

materials suppliers on how to drain and properly dispose of residual fluids from 

vehicles, equipment, engines, radiators, transmissions, oil-filled transformers and 

individual containers or drums; or have a procedure to properly drain and dispose 

of fluids if fluid removal did not occur prior to delivery of fluid containing 

materials to the facility. The site owner or operator shall implement procedures to 

minimize residual fluids from coming into contact with stormwater, and develop 

procedures for accepting scrap lead-acid batteries. Additional requirements for 

the handling, storage and disposal or recycling of batteries are contained in the 

scrap lead-acid battery program discussed later in this sector. The owner or 

operator must provide employee targeted-training to all employees who engage in 

the inspection and acceptance of inbound recyclable materials and, liquid wastes, 

including used oil. These liquids must be stored in material-compatible, nonleaking containers and disposed or recycled in accordance with RCRA. 

Outdoor Scrap and Waste Material Stockpiles or Storage. The facility must 

minimize stormwater contact with stockpiled materials, processed materials and 

non-recyclable wastes. Implement the following BMPs where applicable: ensure 

scrap or waste materials are not leaking fluids and are free of residual materials, 

provide permanent or semi-permanent covers or store materials on an impervious 

surface such as asphalt or concrete; utilize sediment traps, vegetated swales and 

buffer strips, catch basin filters and sand filters to facilitate settling or filtering of 

pollutants; divert stormwater away from storage areas via dikes, berms, 

containment trenches, culverts and surface grading; install oil water separators, 

sumps and apply absorbents booms for areas where potential sources of residual 

fluids are stockpiled (e.g., automobile engine storage areas). 

Outdoor Stockpiling of Turnings Exposed to Cutting Fluids. The facility must 

develop procedures to minimize contact of stormwater with residual cutting 

fluids. BMP options that are used singularly or in combination may include: 

screening, pressing or draining residual fluids from turnings; store all turnings 

exposed to cutting fluids under some form of permanent or semi-permanent cover. 

Stormwater discharges from these areas are permitted provided the discharge is 

first treated by an oil water separator or its equivalent. Identify procedures to 

collect, handle, dispose or recycle residual fluids which may be present; establish 
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dedicated containment areas for all turnings that have been exposed to cutting 

fluids. Stormwater runoff from these areas can be discharged provided: the 

containment areas are constructed of either concrete, asphalt or other equivalent 

types of impervious material; a barrier around the perimeter of the containment 

area is constructed (e.g., berms, curbing, elevated pads, etc.) to prevent contact 

with stormwater run-on; a drainage collection system is constructed for discharges 

generated from containment areas; the permittee has a schedule to maintain the oil 

water separators (or its equivalent); and, the permittee identifies procedures for 

properly disposing or recycling collected residual fluids. 

Covered or Indoor Storage of Scrap and Waste Material Stockpiles/Storage. 

The facility must minimize contact of stormwater with residual liquids and 

particulate matter from materials stored indoors or under cover. BMP options 

include: good housekeeping measures including the use of absorbent materials or 

wet vacuuming to contain, dispose or recycle residual liquids originating from 

recyclable containers; maintain a “dry” shop, this General Permit does not 

authorize discharges from wash-water or other indoor processing areas to a 

surface water or a storm sewer system. All floor drains must be connected to an 

approved holding tank or a POTW. If the floor drains are connected to a sanitary 

sewer, a copy of the agreement with the POTW for any required pre-treatment 

agreement must be maintained in the SWPPP. 

Scrap and Recyclable Waste Processing Areas. The permittee shall minimize the 

contact of stormwater with onsite scrap processing equipment. Activities that 

generate visible amounts of particulate residue, such as shredding must minimize 

the contact of stormwater with accumulated particulate matter and residual fluids 

by employing good housekeeping and preventative maintenance activities. BMP 

options include: locating these operations on a concrete or asphalt pad and 

conducting regular clean-up or collection of visible particulate matter; conducting 

regular equipment inspections for spills, leaks, and for malfunctioning, worn or 

corroded parts or equipment; establishing a preventive maintenance program for 

processing equipment; using absorbent materials, drip pans or practices to collect 

leaking or spilled fluids. Install protection devices such as, low-level alarms or 

other equivalent devices, or install secondary containment capable of containing 

the entire reservoir of any unattended hydraulic reservoirs over 150 gallons. 

Install diversion structures such as dikes, berms, culverts, trenches, elevated 

concrete pads, or conduct grading to minimize contact of stormwater with outdoor 

processing equipment or stored materials. Install oil water separators or sumps; 

install permanent or semi-permanent covers in processing areas where there are 

residual fluids and grease; create retention or detention ponds or basins; sediment 

traps, vegetated swales or vegetated buffer strips (for pollutant settling and 

filtration); and, install catch basin filters or sand filters. 

Scrap Lead-Acid Battery Programs. The facility must properly handle, store and 

dispose of scrap lead-acid batteries. BMP options include the: a) segregation of 

scrap lead-acid batteries from other scrap materials; b) proper handling, storage 

and disposal of cracked or broken batteries; c) collection, containment and 
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disposal of leaking lead-acid battery fluid; d) minimize or eliminate (if possible) 

exposure of scrap lead-acid batteries to stormwater; and, e) implement employee 

training for the handling, storage and management of scrap batteries. 

Spill Prevention and Response Procedures. The facility must minimize 

stormwater contamination at loading or unloading areas, and from equipment or 

container failures. BMP options include: developing prevention and response 

measures for areas that are potential sources of fluid leaks or spills; immediate 

containment and clean up of spills and leaks. If malfunctioning equipment is 

responsible for the spill or leak, repairs must be conducted immediately; 

implement measures including the use of drip pans and absorbent materials. 

Place drip pans or equivalent measures under leaking stationary equipment until 

the leak is repaired. The facility must have an adequate supply of well maintained 

drip pans and absorbent materials onsite. Used absorbent materials must be 

properly disposed of; store drums containing liquids indoors, in a bermed area, in 

overpack containers or spill pallets, or in other containment devices. Install 

overfill prevention devices on fuel pumps or tanks. Install alarms or pump shut 

off systems on outdoor equipment with hydraulic reservoirs exceeding 150 

gallons in the event of a line break. Alternatively, a secondary containment 

system capable of holding the entire contents of the reservoir plus room for 

precipitation can be used. 

Waste Recycling Facilities (Liquid Recyclable Materials). Indoor Waste 

Material Storage. Minimize or eliminate contact between residual liquids from 

waste materials stored indoors and stormwater in the event of a spill or accidental 

release. The plan may refer to applicable portions of other existing plans such as 

SPCC plans required under 40 CFR Part 112. BMP options include establishing: 

procedures for material handling (including labeling and marking); cleaning up 

spills and leaks with absorbent materials or a wet vacuum system; implementing 

appropriate containment structures (trenching, curbing, gutters, etc.); and, 

installing a drainage system, including appurtenances (e.g., pumps or ejectors, 

manually operated valves), to handle discharges from diked or bermed areas. 

Drainage should be discharged to an appropriate treatment facility, sanitary sewer 

system, or otherwise disposed of properly. These discharges may require 

coverage under a separate MEPDES wastewater permit or industrial user permit 

under the pretreatment program. 

Outdoor Waste Material Storage. The permittee shall minimize contact between 

stored residual liquids and stormwater. The plan may refer to applicable portions 

of other existing plans such as SPCC plans required under 40 CFR Part 112. 

Discharges from containment areas containing used oil must be in accordance 

with applicable sections of 40 CFR Part 112 and the terms of this General Permit. 

BMP options include: a) installing appropriate containment structures (e.g., dikes, 

berms, curbing, pits) to store the volume of the largest tank with sufficient extra 

capacity for precipitation; installing drainage control and other diversionary 

structures; provide corrosion protection and leak detection systems for storage 

tanks; and, use absorbent materials or a wet vacuum system to collect spills. 
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Trucks and Rail Car Waste Transfer Areas. Minimize pollutants in discharges 

from truck and rail car loading or unloading areas. Include written measures to 

clean up minor spills and leaks resulting from the transfer of liquid wastes. BMP 

options include containment and diversionary structures to minimize contact with 

stormwater including dry clean-up methods, wet vacuuming, installing roof 

coverings, and implementing runoff controls. 

E. Recycling Facilities (Source Separated Materials). The following identifies 

requirements for facilities that receive only source-separated recyclables from nonindustrial and residential sources that conduct processing activities. Inbound 

Recyclable Material Control. Minimize the chance of accepting non-recyclables 

(e.g., hazardous materials) which could be a significant source of pollutants by 

conducting inspections of inbound materials. 

Outdoor Storage. Minimize exposure of recyclables to stormwater. Use good 

housekeeping measures to prevent accumulation of particulate matter and fluids, 

particularly in high traffic areas. Other BMP options include: provide totallyenclosed drop-off containers for the public; install a sump pump with each container 

pit and treat or discharge collected fluids to a sanitary sewer system; provide dikes 

and curbs for secondary containment (e.g., around bales of recyclable waste paper); 

divert stormwater away from outside material storage areas; provide covers over 

containment bins, dumpsters, and roll-off boxes; and, store the equivalent of one 

day’s volume of recyclable material indoors. 

Indoor Storage and Material Processing. Minimize the release of pollutants from 

indoor storage and processing areas. BMP options: schedule routine good 

housekeeping measures and inspections for all storage and processing areas; prohibit 

tipping floor wash water from draining to the storm sewer system; and, provide 

affected employees training on pollution prevention practices. 

Vehicle and Equipment Maintenance Areas. Prohibit vehicle and equipment wash 

water from discharging to the storm sewer system; minimize or eliminate outdoor 

maintenance areas whenever possible; establish spill prevention and clean-up 

procedures in fueling areas; avoid topping off fuel tanks; divert runoff from fueling 

areas; store lubricants and hydraulic fluids indoors; and, provide employee training on 

proper handling, and storage of fluids and lubricants. 

F. Monitoring and Reporting Requirements. (See also Part VI.)

1. Benchmark Monitoring Requirements: These benchmark parameters apply to 

scrap metal recycling facilities. Facilities which process paper, cardboard, plastic 

or other household or non-industrial recyclables are not required to perform the 

above Benchmark monitoring. Samples must be collected as described in Part VI 

of this General Permit during a qualifying rain event. Additional monitoring or 

corrective actions may be required by the Department based on review of 

Benchmark and Visual Monitoring results. 
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TSS – 100 mg/L 

Total Petroleum Hydrocarbons – 100 mg/L 

pH – 6.0-9.0 units 

2. Visual Monitoring Requirements. Visual monitoring must be conducted quarterly 

during a qualifying storm event. Collect a grab sample for visual monitoring 

analysis from each outfall that has an associated industrial activity within the 

outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with 

and can demonstrate participation in the implementation of an established 

Department Approved Watershed Management Plan; or if the facility is 

conducting Benchmark, Impaired Waters sampling and analysis, or Numeric 

Monitoring for Total Suspended Solids (TSS). Visual monitoring is only waived 

for the outfall(s) associated with Numeric Monitoring. The permittee shall 

conduct quarterly Visual Monitoring at outfalls that do not require Numeric 

Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix O 

Sector O - Steam Electric Generating Facilities 

A. Covered Stormwater Discharges. The requirements for Sector O apply to stormwater 

discharges associated with Steam Electric Generating facilities as identified by the 

Activity Code specified below. 

SECTOR O: STEAM ELECTRIC GENERATING FACILITIES

SE Steam Electric Generating Facilities 

B. Limitations on Coverage. This General Permit does not authorize stormwater 

discharges from: steam electric power generation using coal, natural gas, oil, or 

nuclear energy, to produce a steam source, including coal handling areas; coal pile 

runoff, including effluent limitations established by 40 CFR Part 423; and, dual fuel 

co-generation facilities. 

Stormwater discharges from ancillary facilities including gas turbine stations and 

substations that are not contiguous to a steam electric power generating facility; and 

heat capture co-generation facilities are not covered by this permit. 

C. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) The permittee must identify any areas where 

any of the following may be exposed to stormwater: storage tanks, scrap yards, 

general refuse areas; landfills, construction sites; stock pile areas (e.g., coal or 

limestone piles), short and long term storage of general materials. Materials are, 

but not limited to: supplies, construction materials, paint equipment, oils, fuels, 

used and unused solvents, cleaning materials, paint, water treatment chemicals, 

fertilizer and pesticides). 

2. Monthly Inspections. (Also see Part V(I).) The monthly inspection must include 

an evaluation of the following: coal handling areas, loading and unloading areas, 

switchyards, fueling areas, bulk storage areas, ash handling areas, areas adjacent 

to disposal ponds and landfills, maintenance areas, liquid storage tanks, and, long 

term and short term material storage areas. 

3. Fugitive Dust Emissions. Describe and implement measures to prevent or 

minimize fugitive dust emissions from coal handling areas. Consider such 

procedures to minimize the tracking of coal dust offsite as installing specially 

designed tires on handling vehicles, or washing vehicles in a designated area 

before leaving the handling area. 

4. Delivery Vehicles. Describe and implement measures to prevent or minimize 

contamination of stormwater runoff from delivery vehicles arriving at the plant 

site. Consider the following: procedures to inspect delivery vehicles arriving at 
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the plant site and ensure overall integrity of the body or container; and, 

procedures to deal with leakage or spillage from vehicles or containers. 

5. Fuel Oil Unloading Areas. Describe and implement measures to prevent or 

minimize contamination of stormwater from fuel oil unloading areas. Consider, 

at a minimum (or their equivalents): using containment curbs in unloading areas; 

having personnel familiar with spill prevention and response procedures present 

during deliveries to ensure that any leaks or spills are immediately contained and 

cleaned up; and, using spill and overflow protection (e.g., drip pans, drip diapers 

or other containment devices placed beneath fuel oil connectors to contain 

potential spillage during deliveries or from leaks at the connectors). 

6. Chemical Loading or Unloading. Describe and implement measures to prevent or 

minimize contamination of stormwater from chemical loading or unloading areas. 

Consider, at a minimum (or their equivalents): using containment curbs at 

chemical loading or unloading areas to contain spill; having personnel familiar 

with spill prevention and response procedures present during deliveries to ensure 

that any leaks and spills are immediately contained and cleaned up; and load or 

unload in covered areas and store chemicals indoors. 

7. Miscellaneous Loading or Unloading Areas. Describe and implement measures 

to prevent or minimize contamination of stormwater from loading or unloading 

areas. Consider, at a minimum (or their equivalents): covering the loading area; 

grading, berming, or curbing around the loading area to divert stormwater run-on; 

or, locating the loading or unloading equipment and vehicles so leaks are 

contained in existing containment and flow diversion systems. 

8. Liquid Storage Tanks. Describe and implement measures to prevent or minimize 

contamination of surface runoff from above ground liquid storage tanks. 

Consider using, at a minimum (or their equivalents): protective guards around 

tank; containment curbs; spill and overflow protection; and, dry cleanup methods. 

9. Large Bulk Fuel Storage Tanks. Describe and implement measures to prevent or 

minimize contamination of surface runoff from large bulk fuel storage tanks. 

Consider, at a minimum, using containment berms (or its equivalent). The 

permittee is required to also comply with other applicable local, State and Federal 

laws, including Spill Prevention Control and Countermeasures (SPCC). 

10. Spill Reduction Measures. Describe and implement measures to reduce the 

potential for an oil or chemical spill or reference the appropriate Part of the SPCC 

plan. On a monthly basis, visually inspect the structural integrity of all above 

ground tanks, pipelines, pumps and other related equipment. Any necessary 

repairs must be made immediately. 

11. Oil Bearing Equipment in Switchyards. Describe and implement measures to 

prevent or minimize contamination of surface runoff from oil bearing equipment 

in switchyard areas. Consider using level grades and gravel surfaces to impede 

flows and limit the spread of spills or collecting runoff in perimeter ditches. 
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12. Residue Hauling Vehicles. Inspect all residue hauling vehicles for proper 

covering over the load, adequate gate sealing and overall integrity of the container 

body. Vehicles without load covering or adequate gate sealing, or with leaking 

containers or beds must be repaired as soon as practicable. 

13. Ash Loading Areas. Describe and implement procedures to reduce or control the 

tracking of ash/residue from ash loading areas. Where practicable, clear the ash 

building floor and immediately adjacent roadways of any spillage, debris and 

excess water prior to each vehicle departing the ash loading areas. 

14. Areas Adjacent to Disposal Ponds or Landfills. Describe and implement 

measures to prevent or minimize contamination of surface runoff from areas 

adjacent to disposal ponds or landfills. Develop procedures to reduce ash residue 

that may be tracked on to access roads traveled by residue handling vehicles, and 

reduce ash residue on exit roads leading into and out of residue handling areas. 

15. Landfills, Scrap yards, Surface Impoundments, Open Dumps, General Refuse 

Sites. Address these areas in the SWPPP and include appropriate BMPs as 

referred to in Part V. 

16. Vehicle Maintenance Activities. For vehicle maintenance activities performed on 

the plant site, use the applicable BMPs outlined in this Appendix. 

17. Material Storage Areas. Describe and implement measures to prevent or 

minimize contamination of stormwater runoff from material storage areas 

(including areas used for temporary storage of miscellaneous products and 

construction materials stored in lay-down areas). Consider using (or their 

equivalents): flat yard grades; collecting runoff in graded swales or ditches; 

erosion protection measures at steep outfall sites (e.g., concrete chutes, riprap, 

stilling basins); covering lay-down areas; storing materials indoors; and, covering 

materials temporarily with polyethylene, polyurethane, polypropylene or hypalon. 

Stormwater run-on may be minimized by constructing an enclosure or building a 

berm around the area. 

D. Monitoring and Reporting Requirements. (See also Part VI.)

1. Numeric Monitoring. The permittee shall collect at least two (2) quarterly 

samples and analyze the sample for TSS, and pH. If the average of the two (2) 

samples for either parameter does not exceed the numeric effluent limitation, the 

monitoring requirements are fulfilled for those parameters for the permit year. If 

the average of the two (2) samples exceeds the effluent limitation for any 

parameter the permittee shall review the selection, design and implementation of 

control measures, complete a corrective action report and notify the Department 

within 14 days of receiving the monitoring results. Upon making any necessary 

modifications, the permittee shall collect and analyze two additional samples for 
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any parameter that exceeded the effluent limitation. Additional monitoring may 

be required. 

If the values of the first three years of numeric effluent limit monitoring does 

not exceed the numeric limitation for any parameter, numeric monitoring 

may be reduced to once a year for the remainder of the permit term. 

NUMERIC LIMITATIONS FOR COAL PILE RUNOFF

Parameter Limit Monitoring Frequency Sample Type

Total Suspended Solids (TSS) 50 mg/L, max 1/quarter Grab.

pH 6.0-9.0 min. and max 1/quarter Grab.

Note: If your facility is designed, constructed, and operated to treat the volume of 

coal pile runoff that is associated with a 25-year, 24-hour rainfall event, any 

untreated overflow of coal pile runoff from the treatment unit is not subject to the 

50 mg/L limitation for total suspended solids. 

 

2. Visual Monitoring Requirements. Visual monitoring must be conducted quarterly 

during a qualifying storm event. Collect a grab sample for visual monitoring 

analysis from each outfall that has an associated industrial activity within the 

outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with 

and can demonstrate participation in the implementation of an established 

Department Approved Watershed Management Plan; or if the facility is 

conducting Benchmark, Impaired Waters sampling and analysis, or Numeric 

Monitoring for Total Suspended Solids (TSS). Visual monitoring is only waived 

for the outfall(s) associated with Numeric Monitoring. The permittee shall 

conduct quarterly visual monitoring at outfalls that do not require Numeric 

Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix P 

Sector P - Land Transportation and Warehousing.

A. Covered Stormwater Discharges. The requirements for Sector P apply to stormwater 

discharges associated with industrial activity from Land Transportation and 

Warehousing facilities as identified by the SIC Codes specified below. 

SECTOR P: LAND TRANSPORTATION AND WAREHOUSING

4011, 4013 Railroad Transportation 

4111-4173 Local and Highway Passenger Transportation 

4212-4231 Motor Freight Transportation and Warehousing 

4311 United States Parcel Service 

5171 Petroleum Bulk Stations and Terminals 

B. Limitations on Coverage. (See also Part I(E).) This General Permit does not 

authorize the discharges associated with equipment or vehicle wash water. A copy of 

the MEPDES permit issued for vehicle or equipment wash water (or a copy of the 

pending application) must be attached or referenced in the SWPPP. If an industrial 

user permit is issued under a pretreatment program, attach a copy to the SWPPP. 

If wash water is handled in another manner (e.g., hauled offsite), describe the disposal 

method and attach all pertinent waste manifests and documentation and any other 

information (e.g., frequency, volume, destination, etc.) in the plan. 

C. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) Identify the locations of any of the following 

activities or sources: fueling stations; vehicle and equipment maintenance or 

cleaning areas; vehicle, equipment, and material storage areas; loading and 

unloading areas; areas where treatment, storage or disposal of wastes occur; and 

liquid storage tanks. 

2. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) 

Describe and assess the potential for the following to contribute pollutants to 

stormwater: onsite fluid and waste fluid storage or disposal; parking areas for 

vehicles awaiting maintenance; activities associated with mechanical repairs; 

grinding, painting or fabrication; used battery storage and fueling areas. 

3. Inspections. (See also Part V(I).) The permittee shall inspect storage areas for 

vehicles and equipment awaiting maintenance; fueling areas; indoor and outdoor 

vehicle or equipment maintenance areas; material storage areas; vehicle or 

equipment cleaning areas; vents and stacks associated grinding, sanding or 

painting; and loading and unloading areas. 

4. Good Housekeeping Measures. (See also Part V(D)(9)(a).) Perform good 

housekeeping which includes the following areas and activities: 
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Vehicle and Equipment Storage Areas. Leaky or leak-prone vehicles or 

equipment awaiting maintenance must be confined to designated areas. Use drip 

pans or absorbent pads under leaking vehicles and equipment. Store vehicles and 

equipment scheduled for maintenance inside or under cover if possible, or on an 

impervious surface such as concrete or asphalt if stored outside. 

Fueling Areas. Prevent or minimize stormwater contamination from fueling areas 

by immediately cleaning up drips and spills with absorbent pads or dry absorbent 

materials. The facility must have a spill kit on site. Consider covering the fueling 

area with an overhang or extended roof area. 

Vehicle and Equipment Cleaning Areas. The discharge of vehicle or equipment 

wash water is not authorized under this General Permit. Consider performing all 

washing or cleaning operations indoors in a dedicated wash bay where the wash 

water is either pumped to a holding tank or sent to the sanitary sewer. The latter 

may require a pre-treatment agreement with the POTW. Outdoor washing is 

allowed if there is no discharge to a stormwater conveyance or a surface water, 

and there is no engine washing or the use of acids bases or degreasers. 

Vehicle and Equipment Maintenance Areas. Implement measures to prevent or 

minimize contamination of stormwater with fluids, grease, or particulate matter 

from grinding or sanding. Consider performing maintenance activities indoors 

and use drip pans or other absorbent materials for drips and spills. Maintain an 

organized inventory of materials used in the shop; drain all parts of fluid prior to 

disposal. Maintain a dry indoor maintenance shop and prohibit wet clean up 

practices. 

Locomotive Sanding (Loading Sand for Traction) Areas. Implement measures to 

prevent the discharge of traction sand, measures may include: covering sanding 

areas; minimizing stormwater run on and runoff. The permittee shall implement 

appropriate sediment removal practices to minimize the offsite transport of 

sanding material. 

Material Storage Areas. Maintain all liquid material storage vessels free of debris 

or residue for products and waste products to prevent contamination of 

stormwater. Plainly label all waste product containers (e.g., “Used Oil,” “Spent 

Solvents,” etc.). Consider storing the materials indoors with proper secondary 

containment. Barrels stored outside must residue free and stored on pallets while 

awaiting transport for indoor use or for proper disposal. Outdoor storage of 

barrels must be inspected weekly for spills or leaks. 

5. Employee Training. (See also Part V(D)(9)(a).) Provide annual training to 

address, as applicable: spill response and safety procedures, used oil and spent 

solvent storage and management; fueling procedures; general good housekeeping 

practices for painting, grinding, sanding and metal or fiberglass fabrication, and 

welding; and, used battery storage, containment and management. 
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D. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix Q 

Sector Q - Water Transportation.

A. Covered Stormwater Discharges. The requirements for Sector Q apply to stormwater 

discharges associated with industrial activity from Water Transportation as identified 

by the Activity Codes specified below. 

SECTOR Q: Water Transportation

4412-4499 Water Transportation 

B. Limitations on Coverage. (See also Part I(E).) This General Permit does not 

authorize the following: discharges containing bilge and ballast water; sanitary 

wastes; pressure wash water; and, cooling water originating from vessels. An 

Antifouling Paint Contaminated Vessel Wash Water General Permit is required for 

discharges of bottom wash water which contains Antifouling Paints (AFP). 

C. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) Identify areas where the following may be 

exposed to precipitation/surface runoff: fueling; engine maintenance or repair; 

vessel maintenance or repair; pressure washing; painting; sanding; blasting; 

welding; metal fabrication; loading or unloading areas; locations used for the 

treatment, storage or disposal of wastes; liquid storage tanks; liquid storage areas 

(e.g., paint, solvents, resins); and, material storage areas (e.g., blasting media, 

aluminum, steel, scrap iron). 

2. Potential Pollutant Sources and Exposed Materials (See also Part V(D)(4).) 

Describe the following additional sources and activities that have potential 

pollutants associated with them (if applicable): outdoor manufacturing or 

processing activities (e.g., welding, metal fabricating); and; significant dust or 

particulate generating processes (e.g., abrasive blasting, grinding, sanding, 

scraping). 

3. Good Housekeeping Measures. (See also Part V(D)(9)(a).) 

Pressure Washing Area. If pressure washing is used to remove marine growth 

from vessels, the discharge water must be permitted as a process wastewater by a 

separate MEPDES permit. 

Blasting and Painting Area. If applicable, implement and describe measures to 

prevent spent abrasives, paint chips and over spray from discharging into the 

receiving water or the storm sewer systems. Consider containing all blasting or 

painting activities or use other measures to prevent the discharge of contaminants 

(e.g., hanging plastic barriers or tarpaulins during blasting or painting operations 

to contain debris). Where necessary, regularly clean stormwater conveyances of 

deposits of abrasive blasting debris and paint chips. Provide written details in the 
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SWPPP outlining any standard operating practices relating to blasting, sanding, 

grinding, scraping or painting that will occur (e.g., prohibiting these activities 

over open water, and prohibit these activities during windy conditions which can 

render containment ineffective). 

Engine Maintenance and Repair Areas. If applicable, implement and describe 

measures to prevent or minimize the contamination of stormwater from all areas 

used for engine maintenance and repair. Consider the following (or their 

equivalents): performing all maintenance activities indoors; maintaining an 

organized inventory of materials used in the shop; draining all parts of fluid prior 

to disposal; keeping a dry shop using dry cleanup methods such as sweeping and 

prohibiting the practice of hosing down the shop floor; and, treating or recycling 

stormwater runoff collected from the maintenance area. 

Material Handling Area. If applicable, implement and describe measures to 

prevent or minimize the contamination of stormwater from material handling 

operations and areas (e.g., fueling, paint and solvent mixing, disposal of process 

wastewater streams from vessels). Consider the following (or their equivalents): 

covering fueling areas; using spill overflow protection and not letting customers 

conduct fueling operations; mixing paints and solvents in a designated area 

(preferably indoors or under a shed); and, minimizing stormwater run-on to 

material handling areas. 

Dry-dock Activities. If applicable, describe the procedures for routinely 

maintaining or cleaning the dry-dock to prevent or minimize pollutants in 

stormwater. Address the cleaning of accessible areas of the dry-dock prior to 

flooding, and final cleanup following removal of the vessel and raising the dock. 

Include procedures for cleaning up oil, grease or fuel spills occurring on the drydock. Consider the following (or their equivalents): sweeping rather than hosing 

off debris or spent blasting material from accessible areas of the dry-dock prior to 

flooding, and having absorbent materials and oil containment booms readily 

available to contain or cleanup any spills. 

General Yard Area. Implement and describe a schedule for routine yard 

maintenance and cleanup. Regularly remove from the general yard area scrap 

metal, wood, plastic, miscellaneous trash, paper, glass, industrial scrap, insulation, 

welding rods, and packaging. 

4. Monthly Inspections. (See also Part V(I).) If the following activities occur at the 

facility these activity areas must be inspected monthly during periods of 

operation: pressure washing area; blasting, grinding, scraping, sanding and 

painting areas; material storage areas; engine maintenance or repair areas; 

material handling areas; dry-dock area; and, general yard area. 

5. Stormwater Management Controls. (See also Part V(D)(9)(a).) Timely 

inspections and maintenance of stormwater management devices must be 

performed to remain compliant in the preventive maintenance program. As part 

of the preventive maintenance program, perform timely inspection and 
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maintenance of stormwater management devices (e.g., cleaning oil water 

separators and sediment traps to ensure that spent abrasives, paint chips and solids 

will be intercepted and retained prior to entering the storm drainage system) as 

well as inspecting and testing facility equipment and systems to uncover 

conditions that could cause breakdowns or failures resulting in discharges of 

pollutants to surface waters. 

6. Material Containment. Store and plainly label all containerized materials (e.g., 

fuels, paints, solvents, waste fluids, antifreeze, batteries) in a protected, secure 

location away from drains. Implement and describe measures to prevent or 

minimize the contamination of stormwater from the storage areas. Specify which 

materials are stored indoors and consider containment or enclosure for those 

stored outdoors. If abrasive blasting or grinding is performed, document the 

storage and disposal of spent abrasive materials generated at the facility. 

Consider implementing an inventory control plan to limit the presence of 

potentially hazardous materials onsite. Proper approved containment and storage 

must be used for all wash water and other wastewater collection. (See also Part 

V(D)(6).) 

7. Employee Training. (See also Part V(D)(9)(a).) At a minimum, the employee 

training program must include (as applicable) the following topics: used oil 

management; spent solvent management; disposal of spent abrasives; disposal of 

vessel wastewaters; Grinding, blasting, scraping, sanding and painting; spill 

prevention and control; fueling procedures; general good housekeeping practices; 

and, used battery storage, disposal and management. 

D. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix R 

Sector R - Ship and Boat Building or Repair Yards.

A. Covered Stormwater Discharges. The requirements for Sector R apply to stormwater 

discharges associated with industrial activity from Ship and Boat Building or Repair 

Yards as identified by the Activity Codes specified below. 

SECTOR R: SHIP AND BOAT BUILDING OR REPAIRING YARDS

3731, 3732 Ship and Boat Building or Repairing Yards 

B. Limitations on Coverage. (See also Part I(E).) This General Permit does not 

authorize the following: discharges containing bilge and ballast water; sanitary 

wastes; pressure wash water; and, cooling water originating from vessels. An 

Antifouling Paint Contaminated Vessel Wash Water General Permit is required for 

discharges of bottom wash water which contains Antifouling Paints (AFP). 

C. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) Identify areas where the following may be 

exposed to stormwater: fueling; engine maintenance or repair; vessel 

maintenance or repair; pressure washing; painting; sanding; grinding, blasting; 

welding; metal fabrication; loading or unloading areas; locations used for the 

treatment, storage or disposal of wastes; liquid storage tanks; liquid storage areas 

(e.g., paint, solvents, resins); and, material storage areas (e.g., blasting media, 

aluminum, steel, scrap iron). 

2. Potential Pollutant Sources and Exposed Materials (See also Part V(D)(4).) 

Describe the following additional sources and activities that have potential 

pollutants associated with them (if applicable): outdoor manufacturing or 

processing activities (e.g., welding, metal fabricating, repairs and maintenance); 

and; significant dust or particulate generating processes (e.g., abrasive blasting, 

grinding, scraping or sanding). 

3. Good Housekeeping Measures. (See also Part V(D)(9)(a).) 

Pressure Washing Area. If pressure washing is used to remove marine growth 

from vessels, the discharge water must be permitted as a process wastewater by a 

separate MEPDES permit. 

Blasting and Painting Area. Implement and describe measures to prevent spent 

abrasives, paint chips and over spray from discharging into the receiving water or 

the storm sewer systems. Consider containing all blasting or painting activities or 

use other measures to prevent the discharge of contaminants (e.g., hanging plastic 

barriers or tarpaulins during blasting or painting operations to contain debris). 

Where necessary, regularly clean stormwater conveyances of deposits of abrasive 

blasting debris and paint chips. Provide written details in the SWPPP outlining 
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any standard operating practices relating to blasting/painting that will occur (e.g., 

prohibiting uncontained blasting or painting over open water, or prohibiting 

blasting and painting during windy conditions which can render containment 

ineffective). 

Engine Maintenance and Repair Areas. Implement and describe measures to 

prevent or minimize the contamination of stormwater from all areas used for 

engine maintenance and repair. Consider the following (or their equivalents): 

performing all maintenance activities indoors; maintaining an organized inventory 

of materials used in the shop; draining all parts of fluid prior to disposal; 

prohibiting the practice of hosing down the shop floor; using dry cleanup 

methods; and, treating or recycling stormwater collected from the maintenance 

area. 

Material Handling Area. Implement and describe measures to prevent or 

minimize the contamination of stormwater from material handling operations and 

areas (e.g., fueling, paint and solvent mixing, disposal of process wastewater 

streams from vessels). Consider the following (or their equivalents): covering 

fueling areas; using spill or overflow protection; mixing paints and solvents in a 

designated area (preferably indoors or under a shed); and, minimizing stormwater 

run-on to material handling areas. 

Dry-dock Activities. Describe the procedures for routinely maintaining or 

cleaning the dry-dock to prevent or minimize pollutants in stormwater runoff. 

Address the cleaning of accessible areas of the dry-dock prior to flooding, and 

final cleanup following removal of the vessel and raising the dock. Include 

procedures for cleaning up oil, grease or fuel spills occurring on the dry-dock. 

Consider the following (or their equivalents): sweeping rather than hosing off 

debris or spent blasting material from accessible areas of the dry-dock prior to 

flooding, and having absorbent materials and oil containment booms readily 

available to contain/cleanup any spills. 

General Yard Area. Implement and describe a schedule for routine yard 

maintenance and cleanup. Regularly remove from the general yard area scrap 

metal, wood, plastic, miscellaneous trash, paper, glass, industrial scrap, insulation, 

welding rods, and packaging. 

4. Monthly Inspections. (See also Part V(I).) Inspect the following areas on a 

monthly basis: pressure washing area; blasting, grinding, scraping, sanding and 

painting areas; material storage areas; engine maintenance or repair areas; 

material handling areas; dry-dock area; and, general yard area. 

5. Stormwater Management Controls. (See also Part V(D)(9)(a).) Timely 

inspections and maintenance of stormwater management devices must be 

performed to remain compliant in the preventive maintenance program. As part 

of the preventive maintenance program, perform timely inspection and 

maintenance of stormwater management devices (e.g., cleaning oil water 
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separators and sediment traps to ensure that spent abrasives, paint chips and solids 

will be intercepted and retained prior to entering the storm drainage system) as 

well as inspecting and testing facility equipment and systems to uncover 

conditions that could cause breakdowns or failures resulting in discharges of 

pollutants to surface waters. 

6. Material Containment. Store and plainly label all containerized materials (e.g., 

fuels, paints, solvents, waste oil, antifreeze, batteries) in a protected, secure 

location away from drains. Implement and describe measures to prevent or 

minimize the contamination of stormwater from the storage areas. Specify which 

materials are stored indoors and consider containment or enclosure for those 

stored outdoors. If abrasive blasting, or grinding is performed, discus the storage 

and disposal of spent abrasive materials generated at the facility. Consider 

implementing an inventory control plan to limit the presence of potentially 

hazardous materials onsite. Proper approved containment and storage must be 

used for all wash water and other wastewater collection. (See also Part V(D)(6).) 

7. Employee Training. (See also Part V(D)(9)(a).) At a minimum, the employee 

training program must include (as applicable) the following topics: used oil 

management; spent solvent management; disposal of spent abrasives; disposal of 

vessel wastewaters; spill prevention and control; fueling procedures; general good 

housekeeping practices; painting and blasting procedures; and, used battery 

storage, containment and management. 

D. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased.
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Appendix S 

Sector S - Air Transportation 

A. Covered Stormwater Discharges. The requirements for Sector S apply to stormwater 

discharges associated with industrial activity from Air Transportation facilities as 

identified by the SIC Codes specified below. 

SECTOR S: AIR TRANSPORTATION

4512-4581 Air Transportation Facilities 

B. Limitations on Coverage. (See also Part I(E).) This General Permit does not 

authorize the following discharges: aircraft, ground vehicle, runway and equipment 

wash waters; and dry weather discharges of deicing chemicals unless the facility 

performs deicing in a location that includes a deicing recovery system. These 

discharges must be covered by a separate MEPDES permit. 

Only those portions of the facility that are involved in vehicle maintenance (including 

vehicle rehabilitation, mechanical repairs, painting, fueling and lubrication), 

equipment cleaning operations or deicing operations are addressed in this Appendix. 

C. Special Conditions.

Hazardous Substances or Oil. Each individual permittee is required to report spills 

equal to or exceeding the reportable quantity (RQ) levels specified at 40 CFR 110, 

117 and 302. See also 38 M.R.S.A. § 543, 550 and 1318-B. If an airport authority is 

the sole permittee, then the sum total of all spills at the airport must be assessed 

against the RQ. If the airport authority is a co-permittee with other operators at the 

airport, such as numerous different airlines, the assessed amount must be the 

summation of spills by each co-permittee. If separate, distinct individual permittees 

exist at the airport, then the amount spilled by each separate permittee shall be the 

assessed amount for the RQ determination. 

D. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

If an airport’s tenant has a SWPPP for discharges from their own areas of the airport, 

that SWPPP must be integrated with the plan for the entire airport. Tenants of the 

airport facility include air passenger or cargo companies, fixed based operators and 

other parties who have contracts with the airport authority to conduct business 

operations on airport property and whose operations result in stormwater discharges 

associated with industrial activity. 

1. Site Map. (See also Part V(D)(3).) The permittee shall identify areas where any 

of the following may be exposed to stormwater: aircraft and runway deicing 

operations; fueling stations; aircraft, ground vehicle, equipment maintenance and 

cleaning areas; and, storage areas for aircraft, ground vehicles and equipment 

awaiting maintenance. 
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2. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) The 

permittee must describe the following activities: aircraft, runway, ground vehicle, 

equipment maintenance and cleaning; aircraft and runway deicing operations. 

These areas may include apron and centralized aircraft deicing stations, runways, 

taxiways and ramps. 

If the permittee uses deicing chemicals, the permittee shall maintain a record of 

the types (including the Material Safety Data Sheets [MSDS]) used and the 

monthly quantities, either as measured or, in the absence of metering, as estimated 

to the best of the facility's owner(s) or operator(s) knowledge. This includes all 

deicing chemicals, not just glycols and urea (e.g., potassium acetate), because 

large quantities of these other chemicals can still have an adverse impact on 

receiving waters. Tenants or other fixed-based operations that conduct deicing 

operations shall provide the above information to the airport authority for 

inclusion in any comprehensive airport SWPPPs. 

Note: “deicing” will generally be used to imply both deicing (removing frost, snow or 

ice) and anti-icing (preventing accumulation of frost, snow or ice) activities, unless 

specific mention is made regarding anti-icing and/or deicing activities. 

Runway Deicing Operation. Evaluate, at a minimum, whether over-application of 

deicing chemicals occurs by analyzing application rates and adjusting as 

necessary, consistent with considerations of flight safety. Also consider these 

BMP options (or their equivalents): metered application of chemicals; pre-wetting 

dry chemical constituents prior to application; installing a runway ice detection 

system; and, implementing anti-icing operations as a preventive measure against 

ice buildup. 

Aircraft Deicing Operations. Determine whether excessive application of deicing 

chemicals occurs and adjust as necessary, consistent with considerations of flight 

safety. This evaluation must be carried out by the aircraft pilot. Consider using 

alternative deicing/anti-icing agents as well as containment measures for all 

applied chemicals. The permittee may consider BMP options (or their 

equivalents) for reducing deicing fluid use. Also consider using ice-detection 

systems and airport traffic flow strategies and departure slot allocation systems. 

Management of deicing. Where deicing operations occur, describe and 

implement a program to control or manage contaminated runoff to reduce the 

amount of pollutants being discharged from the activity. Consider these BMP 

options or equivalents: a dedicated deicing facility with a runoff collection and 

recovery system; use vacuum collection trucks; store contaminated stormwater or 

deicing fluids in tanks and release controlled amounts to a publicly owned 

treatment works; collect contaminated runoff in a wet pond for biochemical 

decomposition (be aware of attracting wildlife that may prove hazardous to flight 

operations); and, direct runoff into vegetative swales or other infiltration 

measures. Also consider recovering deicing materials when these materials are 

applied during non-precipitation events (e.g., covering storm sewer inlets, using 

booms, installing absorptive interceptors in the drains, etc.) to prevent these 
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materials from later becoming a source of stormwater contamination. Used 

deicing fluid should be recycled whenever possible. 

Source Reduction. Consider alternatives to the use of urea and glycol-based 

deicing chemicals to reduce the aggregate amount of deicing chemicals used 

and/or decrease environmental impact. Chemical options to replace ethylene 

glycol, propylene glycol and urea include: potassium acetate; magnesium acetate; 

calcium acetate; and, anhydrous sodium acetate. 

3. Good Housekeeping Measures. (See also Part V(D)(9)(a).) Describe and 

implement measures to prevent or minimize the contamination of stormwater 

from all areas used for aircraft, ground vehicle and equipment maintenance 

(including the maintenance conducted on the terminal apron and in dedicated 

hangers). Consider the following practices or equivalents: perform maintenance 

activities indoors; maintain an organized inventory of material used in the 

maintenance areas; drain all parts of fluids prior to disposal; prevent the practice 

of hosing down the apron or hanger floor; use dry cleanup methods; and collect 

the or treat stormwater from the maintenance area. 

a. Aircraft, Ground Vehicle and Equipment Cleaning Areas. Clean 

equipment only in the designated areas identified in the SWPPP and site 

map. Describe and implement measures that prevent or minimize the 

contamination of stormwater from cleaning areas. 

b. Aircraft, Ground Vehicle and Equipment Storage Areas. Store all aircraft, 

ground vehicles and equipment awaiting maintenance in designated areas. 

Consider the following BMPs or equivalents: store aircraft and ground 

vehicles indoors; using drip pans for the collection of fluid leaks; and, 

perimeter drains, dikes or berms surrounding the storage areas. 

4. Inspections. Specify the frequency of inspections in the SWPPP. During the 

deicing season, inspections must be conducted monthly for all areas and 

equipment used in the deicing operations. This includes all months during which 

deicing chemicals are used. The Department may specifically require the 

permittee to increase inspections and SWPPP reevaluations as necessary. 

The permittee shall conduct one of the quarterly Site Compliance Evaluations 

(See also Part V(I).) during a qualifying rain event during the deicing season or 

within 30 days after deicing operations have ceased. 

5. Material Containment. Maintain the vessels of stored materials (e.g., used oils, 

hydraulic fluids, spent solvents, and waste aircraft fuel) in good condition, to 

prevent or minimize contamination of stormwater. Also plainly label the vessels 

(e.g., “used oil,” “Contaminated Jet A,” etc.). Describe and implement measures 

that prevent or minimize contamination of stormwater from these areas. Consider 

the following BMPs or equivalents: store materials indoors; store waste materials 

in a centralized location; and, install berms or dikes around storage areas. 
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Airport Fuel System and Fueling Areas. Describe and implement measures to 

prevent or minimize the discharge of fuel to the storm sewer or surface waters 

resulting from fuel servicing activities or other operations conducted in support of 

the airport fuel system. Consider the following BMPs or equivalents: implement 

spill and overflow practices (e.g., placing absorptive materials beneath aircraft 

during fueling operations); using dry cleanup methods; and, collect contaminated 

stormwater. 

E. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix T 

Sector T - Treatment Works.

A. Covered Stormwater Discharges. The requirements for Sector T apply to stormwater 

discharges associated with Treatment Works facilities as identified by the Activity 

Code specified below. 

SECTOR T: TREATMENT WORKS

TW Treatment Works 

B. Industrial Activities Covered by Sector T. The requirements listed under this Part 

pertain to all existing point source stormwater discharges associated with the 

following activities: 

Treatment works treating domestic sewage or any other sewage sludge or wastewater 

treatment device or system used in the storage, treatment, recycling and reclamation 

of municipal or domestic sewage, including land dedicated to the disposal of sewage 

sludge and those areas that are located within the confines of the facility with a design 

flow of 1.0 MGD or more; or required to have an approved pretreatment program 

under 40 CFR Part 403. 

Not required to have permit coverage: farm lands; domestic gardens or lands used for 

sludge management where sludge is beneficially reused and which are not physically 

located within the facility; or areas that are in compliance with Section 405 of the 

Clean Water Act. 

C. Limitations on coverage. (See also Part I(E).) This General Permit does not 

authorize the following: sanitary and industrial wastewater; and equipment or vehicle 

wash water. 

Wastewater and Wash Water Requirements. (See also Part I(E)(3).) If the facility 

has a MEPDES permit for: wastewater, industrial process water, vehicle and 

equipment wash water discharges, these permits must be referenced in the facility’s 

SWPPP. If the wash water is handled in another manner, describe the disposal 

method and include documentation in the SWPPP. 

D. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) The permittee shall identify areas where any 

of the following may be exposed to stormwater: grit, screenings and other solids 

handling, storage or disposal areas; sludge drying beds; dried sludge piles; 

compost piles; septage or hauled waste receiving station; and, storage areas for 

process chemicals, petroleum products, solvents, fertilizers, herbicides and 

pesticides. 
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2. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) The 

permittee must describe the following potential pollutant sources and activities as 

applicable: grit, screenings and other solids handling, storage or disposal areas; 

sludge drying beds; dried sludge piles; compost piles; septage or hauled waste 

receiving station; and, access roads and rail lines. 

3. Stormwater Management Controls. (See also Part V(D)(8) and (9).) In addition 

to the other BMPs considered, consider routing stormwater to the treatment works 

or covering exposed materials from the following areas: grit, screenings and other 

solids handling, storage or disposal areas; sludge drying beds; dried sludge piles; 

compost piles; septage; or, hauled waste receiving station. 

4. Inspections. (See also Part V(I).) Include the following areas in all inspections: 

access roads, rail lines; grit, screenings and other solids handling, storage or 

disposal areas; sludge drying beds; dried sludge piles; compost piles; septage; or, 

hauled waste receiving station areas. 

5. Employee Training. (See also Part V(D)(9)(a).) At a minimum, the training of 

employees must address the following topics when applicable to a facility: 

petroleum product management; process chemical management; spill prevention 

and controls; fueling procedures; general good housekeeping practices; and, 

proper procedures for using fertilizer, herbicides and pesticides. 

E. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased.
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Appendix U 

Sector U - Food and Kindred Products 

A. Covered Stormwater Discharges. The requirements for Sector U apply to stormwater 

discharges associated with Food and Kindred Products facilities as identified by the 

SIC Codes specified below. Including material handling sites; refuse sites; sites used 

for storage and maintenance of material handling equipment; manufacturing 

buildings; and, storage areas for raw material and intermediate and finished products. 

This includes historical site industrial activity areas and locations where significant 

materials remain on the property. “Material handling activities” include the storage, 

loading or unloading, transportation or conveyance of any raw material, intermediate 

product, finished product, by-product or waste product; 

SECTOR U: FOOD AND KINDRED PRODUCTS

2011-2015 Meat Products 

2021-2026 Dairy Products 

2032 Canned, Frozen and Preserved Fruits, Vegetables and Food Specialties 

2041-2048 Grain Mill Products 

2051-2053 Bakery Products 

2061-2068 Sugar and Confectionary Products 

2074-2079 Fats and Oils 

2082-2087 Beverages 

2091-2099 Miscellaneous Food Preparations and Kindred Products 

2111-2141 Tobacco Products 

B. Limitations on Coverage. (See also Part I(E).) This General Permit does not 

authorize the following discharges from; boiler blow-down, cooling tower overflow 

and blow-down, ammonia refrigeration purging and vehicle washing or clean-out 

operations, and sites used for application or disposal of process wastewaters or 

residential wastewater treatment, storage, or disposal. Concentrated Animal Feeding 

Areas (CAFOs) are not covered under this permit. 

C. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) The permittee shall identify areas where any 

of the following may be exposed to stormwater: vents or stacks from cooking, 

drying and similar operations; dry product vacuum transfer lines; animal holding 

pens; spoiled product; and, broken product container storage areas. 

2. Potential Pollutant Sources and Exposed Material. (See also Part V(D)(4).) If the 

facility uses, has used, applies or stores pest-control chemicals including 

rodenticides, insecticides, fungicides, etc. these chemicals and processes must be 

identified in the SWPPP. 

3. Inspections. (See also Part V(I).) The permittee must regularly inspections the 

following areas: loading and unloading areas for all significant materials; storage 

areas including associated containment areas; waste management units; vents and 
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stacks emanating from industrial activities; spoiled product and broken product 

container holding areas; animal holding pens; staging areas; and, air pollution 

control equipment. 

4. Good Housekeeping. Good housekeeping practices include maintaining all 

material storage areas, minimizing dust and debris from vent and stack areas and 

making certain that spoiled product and broken product containers or holding 

areas are properly contained and not discharging to a surface water or a 

stormwater conveyance system; and that offsite tracking of material is minimized. 

5. Employee Training. (See also Part V(D)(9)(a).) The permittee shall address pest 

control in the training program. As applicable to the facility and with regards to 

federal and state regulations, and as further required by the facility’s employee 

training program, the training program shall address concerns mandated by good 

manufacturing processes, and the amended FIRFA to include an Integrated Pest 

Management Plan (IPM). The training will also address spill response and use of 

the SWPPP. 

D. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix V 

Sector V - Textile Mills, Apparel and Other Fabric Products 

A. Covered Stormwater Discharges. The requirements for Sector V apply to stormwater 

discharges associated with Textile Mills, Apparel, and Other Fabric Product 

Manufacturing facilities as identified by the SIC Code specified below. 

SECTOR V: TEXTILE MILLS, APPAREL, AND OTHER FABRIC PRODUCT 

MANUFACTURING, LEATHER AND LEATHER PRODUCTS

2211-2299 Textile Mill Products 

2311-2399 Apparel and Other Finished Products Made From Fabrics and Similar Materials 

3131-3199 

(except 

3111) 

Leather and Leather Products, except Leather Tanning and Finishing 

(see Sector Z) 

B. Limitations on Coverage. (See also Part I(E).) This General Permit does not 

authorize the non-stormwater discharges from the following: discharges of 

wastewater (e.g., wastewater resulting from wet processing or from any processes 

relating to the production process); and, reused or recycled water; and waters used in 

cooling towers. 

C. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) As 

applicable to the facility, describe the following potential pollutant sources: backwinding; beaming; bleaching; backing bonding; carbonizing; carding; cutting and 

sewing operations; desizing; drawing; dyeing; locking; fulling; knitting; 

mercerizing; opening; packing; plying; scouring; slashing; spinning; synthetic-felt 

processing; textile waste processing; tufting; turning; weaving; web forming; 

winging; yarn spinning; and, yarn texturing. 

2. Material Containment. Plainly label and store all containerized materials (e.g., 

fuels, petroleum products, solvents, dyes, etc.) in a protected area away from 

drains. Describe and implement measures aimed at preventing or minimizing 

contamination of stormwater runoff from storage areas and include a description 

of the containment area or enclosure used for those materials stored outdoors. 

Also consider an inventory control plan to prevent purchases of potentially 

hazardous substances. When storing empty chemical drums or containers, ensure 

the drums or containers are clean and there is no contact of residuals with 

precipitation. Consider triple-rinsing the drums and containers. Properly collect 

and dispose of wash water from the drum and container triple rinsings. 
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3. Stormwater Management Controls. 

Material Handling Area. The following must be considered: use of spill or 

overflow protection; covering fueling areas; and, covering or enclosing areas 

where the transfer of material may occur. Address the replacement or repair of 

leaking connections, valves, transfer lines and pipes used to carry or transport 

chemicals, dyes or wastewater. 

Fueling Areas. The following must be considered: covering the fueling area, 

using spill and overflow protection, minimizing run-on of stormwater to the 

fueling areas, using dry cleanup methods, and, treating and or recycling 

stormwater runoff collected from the fueling area. 

Above Ground Storage Tank Area. The following must be considered: regular 

cleanup of above ground storage tank areas; preparation of the spill prevention 

control and countermeasure program; provide spill and overflow protection; 

minimizing runoff of stormwater from adjacent areas; restricting access to the 

area; insertion of filters in adjacent catch basins; providing absorbent booms in 

unbermed fueling areas; using dry cleanup methods; and, permanently sealing 

drains within critical areas that may discharge to a storm drain. 

4. Monthly Inspections. (See also Part V(I)(1-3).) Minimally, conduct monthly 

inspections of transfer and transmission lines; fueling areas; catch basins; 

processing areas, material containment, and all BMPs. 

5. Employee Training. (See also Part V(D)(9)(a).) Additional employee training 

shall include: use of reused recycling waters; solvents management; proper 

disposal of dyes; proper disposal of petroleum products and spent lubricants; spill 

prevention and control; fueling procedures; and, good housekeeping practices. 

D. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased.
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Appendix W 

Sector W - Furniture and Fixtures

A. Covered Stormwater Discharges. The requirements for Sector W apply to stormwater 

discharges associated with Furniture and Fixtures and Wood Kitchen Cabinets as 

identified by the SIC Codes specified below. 

SECTOR W: FURNITURE AND FIXTURES

2434 Wood Kitchen Cabinets 

2511-2599 Furniture and Fixtures 

B. Limitations on Coverage. This General Permit does not authorize stormwater 

discharges from sawdust piles or other residual wood byproducts or from dust 

collecting systems that may malfunction and discharge sawdust onto roofing systems 

or other material or storage areas where there may be contact with sprayed chemical 

formulations to provide wood surface protection or between phases of furniture 

finishing or refinishing. These discharges must be covered by a separate MEPDES 

permit. 

C. Additional SWPPP Requirements and Non-numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) The permittee shall identify areas where any 

of the following may be exposed to stormwater: material storage (including tanks 

or other vessels used for liquid or waste storage) areas; outdoor material 

processing areas including dust collection systems; and areas where wastes are 

treated, stored or disposed; access roads; and, rail spurs. 

2. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) If 

the facility stores wood products or has the potential to generate sawdust or other 

fines particles, these must be identified in the SWPPP. The permittee shall 

identify and implement BMPs to minimize the contact of these materials with 

stormwater. 

3. Stormwater Management Controls. (See also Part V(D)(8) and (9).) The 

permittee shall describe and implement measures to address the following 

activities or pollutant sources from: raw wood and wood product storage areas; 

residue storage areas; dust collection systems; loading and unloading areas; 

material handling areas; chemical storage areas; fueling and fuel storage areas 

and, equipment or vehicle maintenance, storage and repair areas. 

4. Good Housekeeping. Good housekeeping includes removal of yard debris and 

accumulated wood waste and sediments to limit the discharge of woody debris, 

minimize leachate generated from decaying wood materials and minimize the 

generation of sawdust from dust colleting systems and all product handling areas. 
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The permittee shall document a schedule of the implemented good housekeeping 

measures at the facility. 

5. Material containment. Use containment devices to prevent the tracking, blowing 

or drifting of sawdust, fines and furniture sanding debris to surface waters. 

Containment devices may include but are not limited to, wooden, concrete or 

metal barriers or structures to prevent tracking, blowing or drifting of material. 

Sanding activities should be performed in a designated, screened area to prevent 

wind blown tracking of the sawdust and sanding fines to surface waters. 

Screening may consist of netting, fencing, or other screen used to capture 

windblown particulate matter associated with the sanding or finishing or 

refinishing activity. If stormwater associated with the material containment area 

drains to a waste treatment or process sewer system, only screening to prevent 

wind blown tracking of the material to surface waters or stormwater conveyance 

system must be utilized. 

D. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased.
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Appendix X 

Sector X - Printing and Publishing

A Covered Stormwater Discharges. The requirements in Sector X apply to stormwater 

discharges associated with Printing and Publishing facilities as identified by the SIC 

Codes specified below. 

SECTOR X: PRINTING AND PUBLISHING

2711-2796 Printing, Publishing and Allied Industries 

B. Limitations on Coverage. (See also Part 1(E).) This General Permit does not 

authorize the non stormwater discharge of blanket wash. 

C. Additional SWPPP Requirements and Non-numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) The permittee shall identify areas where any 

of the following may be exposed to stormwater: above ground storage tanks, and, 

drums and barrels that are permanently stored outside. 

2. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) As 

applicable to the facility, describe the following pollutant sources including: 

loading and unloading operations; outdoor storage activities; significant dust or 

particulate generating processes; and, onsite waste disposal practices (e.g., blanket 

wash). Also identify the pollutant or pollutant parameter (e.g., oil and grease, 

scrap metal, etc.) associated with each potential pollutant source. 

3. Material Containment. Label and store all containerized materials including 

skids, pallets, solvents, bulk inks, and hazardous waste, empty drums, portable or 

mobile containers of plant debris, wood crates, steel racks, fuel oil, in a protected 

area, away from storm drains. Provide a narrative of the implementation 

measures aimed at preventing or minimizing contamination of stormwater runoff 

from such storage areas. Include a description of the containment area or 

enclosure for those materials that are stored outdoors. Also consider developing 

an inventory control plan to prevent the practice of purchasing potentially 

hazardous substances. 

4. Stormwater Management Controls. The permittee shall prevent and minimize 

potential pollutants which may mix with stormwater from loading and unloading 

of materials. The following BMPs must be considered: use of spill or overflow 

protection; covering fueling areas; and, covering or enclosing areas where the 

transfer of materials may occur. Where applicable, address the replacement or 

repair of leaking connections, valves, transfer lines and pipes that may carry or 

transport chemicals or wastewater. Other areas which must be considered are: 
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Fueling Areas. Provide a narrative for implemented measures that prevent or 

minimize contamination of stormwater from fueling areas. Consider the 

following (or equivalent measures): covering the fueling area, using spill and 

overflow protection, minimizing stormwater run-on to the fueling areas, using dry 

cleanup methods, and treating or recycling stormwater collected from the fueling 

area. 

Above Ground Storage Tank Area. Provide a narrative for implemented measures 

that prevent or minimize contamination of the stormwater from above ground 

storage tank areas, including the associated piping and valves. Consider the 

following (or equivalent measures): regular cleanup of these areas; preparation of 

the spill prevention control and countermeasure program; provide spill and 

overflow protection; minimizing runoff of stormwater from adjacent areas; 

restricting access to the area; inserting filters in adjacent catch basins; providing 

absorbent booms in non-bermed fueling areas; using dry cleanup methods; and, 

permanently sealing drains within critical areas that may discharge to a storm 

drain.

5. Employee Training. (See also Part V(D)(9)(a).) As applicable, the employee 

training program, must address, at a minimum, the following activities: spent 

solvent management, control measures implemented at the facility to eliminate 

the contact of stormwater with blanket wash or other solvent mixing processes; 

spill prevention and control; used oil management; fueling procedures; and, 

general good housekeeping practices. 

D. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix Y 

Sector Y - Rubber, Miscellaneous Plastic Products and Miscellaneous 

Manufacturing Industries

A. Covered Stormwater Discharges. The requirements for Sector Y apply to stormwater 

discharges associated with Rubber, Miscellaneous Plastic Products and Miscellaneous 

Manufacturing facilities as identified by the SIC Codes specified below. 

SECTOR Y: RUBBER, MISCELLANEOUS PLASTIC PRODUCTS, 

AND MISCELLANEOUS MANUFACTURING INDUSTRIES

3011 Tires and Inner Tubes 

3021 Rubber and Plastics Footwear 

3052, 3053 Gaskets, Packing, and Sealing Devices and Rubber and Plastic Hose and 

Belting 

3061, 3069 Fabricated Rubber Products, Not Elsewhere Classified 

3081-3089 Miscellaneous Plastics Products 

3931 Musical Instruments 

3942-3949 Dolls, Toys, Games and Sporting and Athletic Goods 

3951-3955 

(except 3952 

facilities, see 

Sector C) 

Pens, Pencils, and Other Artist's Materials 

3961, 3965 Costume Jewelry, Costume Novelties, Buttons, and Miscellaneous Notions, 

Except Precious Metal 

3991-3999 Miscellaneous Manufacturing Industries 

B. Additional SWPPP Requirements and Non-numeric Technology Based Effluent 

Limits.

1. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) If 

Zinc is used at the facility, the permittee shall identify and describe these areas, 

including associated BMPs in the facility’s SWPPP and identify the areas on the 

site map. 

2. Good Housekeeping. Perform good housekeeping including a review of the 

handling and storage practices of zinc bags at the facility. The following are 

BMP options which must be considered: training of employees on the handling 

and storage of zinc bags; provide indoor storage of zinc bags; perform cleanup of 

zinc spills without washing the zinc into the storm drain; and, avoid the use of 

large sacks of zinc, and consider using smaller more manageable sized packages. 

Other BMP options which must be considered are: using chemicals which are 

purchased in pre-weighed, sealed polyethylene bags; storing materials which are 

in use in sealable containers; ensuring airspace between the container and the 

cover to minimize “puffing” loss when the container is opened; and, using 

automatic dispensing and weighing equipment. To reduce discharges of zinc 

from onsite dumpsters consider covering dumpster(s), moving dumpster(s) 

indoors, or install dumpster(s) liners. 
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Malfunctioning Dust Collectors or Baghouses: The permittee shall properly 

maintain baghouses to reduce or eliminate discharges of pollutants to stormwater, 

and review the potential for baghouses and dust collectors to be a possible source 

of zinc in stormwater runoff. Replace or repair improperly operating baghouses 

and dust collectors. 

Grinding Operations. Review dust generation from rubber grinding operations 

and, as appropriate, install a dust collection system. 

Zinc Stearate Coating Operations. Develop BMPs to eliminate discharge of zinc 

stearate to stormwater. Provide a detailed narrative for measures aimed at 

preventing or cleaning up drips or spills of zinc stearate slurry that may be 

released to the storm drain. A discharge of zinc stearate is not authorized by this 

General Permit. A sound BMP option would consist of using alternate 

compounds to zinc stearate. 

Controls for Plastic Products Manufacturers. Provide a narrative of implemented 

control mechanisms targeted to minimize the discharge of plastic resin pellets. 

The following BMPs should be considered for implementation (or equivalents 

measures include): minimize spills; prompt and thorough cleanup of spills; 

thoroughly sweep; capture pellets; and, employee awareness training and disposal 

precautions. 

C. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring requirements 

are waived if the facility is in compliance with and can demonstrate participation in 

the implementation of an established Department Approved Watershed Management 

Plan; or if the facility is conducting Benchmark, Impaired Waters sampling and 

analysis, or Numeric Monitoring for Total Suspended Solids (TSS). Visual 

monitoring is only waived for the outfall(s) associated with Numeric Monitoring. 

The permittee shall conduct quarterly visual monitoring at outfalls that do not require 

Numeric Monitoring. Collect a grab sample for visual monitoring analysis from each 

outfall that has an associated industrial activity within the outfall’s drainage area. 

The outfall(s) must be sampled quarterly unless the facility has representative 

outfalls. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix Z 

Sector Z - Leather Tanning and Finishing. 

A. Covered Stormwater Discharges. The requirements for Sector Z apply to stormwater 

discharges associated with Leather Tanning and Finishing facilities as identified by 

the SIC Codes specified below. 

SECTOR Z: LEATHER TANNING AND FINISHING

3111 Leather Tanning and Finishing 

B. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) The permittee shall identify areas where any 

of the following may be exposed to stormwater: processing and storage areas of 

the beam-house, tan-yard, and re-tan wet finishing and dry finishing operations; 

and, haul roads, access roads and rail spurs. 

2. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) As 

appropriate to the facility, describe potential pollutant(s) associated with the 

following activities and sources: temporary or permanent storage of fresh and 

brine cured hides; extraneous hide substances and hair; leather dust, scraps, 

trimmings and shavings; chemical drums, bags, containers and above ground 

tanks; empty chemical containers and bags; spent solvents; floor sweepings or 

washings; refuse, waste piles and sludge; and, significant dust or particulate 

generating processes such as buffing. 

3. Material Containment. Label all chemicals containers including hazardous 

materials, spent solvents, and waste materials. Describe and implement measures 

to prevent or minimize contact with stormwater. The following areas must be 

addressed as applicable: 

Storage Areas for Raw, Semi-processed or Finished Tannery By-products. The 

following should be stored indoors or protected by polyethylene wrapping, 

tarpaulins, roofed storage, or other protective shelter: pallets or bales of raw, 

semi-processed or finished tannery byproducts including splits, trimmings, and 

shavings. Consider placing materials on impermeable surfaces, and enclosing or 

constructing berms around the storage area to prevent stormwater run-on or 

runoff. 

Buffing and Shaving Areas. Provide a narrative of implemented control measures 

targeted to minimize or prevent the contamination of stormwater runoff with 

leather dust from buffing or shaving areas. Consider dust collection enclosures or 

devices, conducting preventive inspection or maintenance programs or other 

appropriate material collection and containment measures. 
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Receiving, Unloading, and Storage Areas. Provide a narrative of implemented 

control measures targeted to minimize or prevent the contamination of stormwater 

runoff from receiving, unloading, and storage areas. If storage areas are exposed 

consider covering all hides and chemical supplies; diverting drainage to the 

process sewer; or, grade berming or curbing area to prevent runoff of stormwater. 

Outdoor Storage of Contaminated Equipment. Provide a narrative of 

implemented control measures targeted to minimize or prevent the contamination 

of stormwater with contaminated equipment. Consider covering equipment; 

diverting drainage to the process sewer; and, cleaning the equipment thoroughly 

prior to storage. 

Waste Management. Provide a narrative of implemented control measures 

targeted to minimize or prevent the contamination of stormwater runoff from 

waste storage areas. The following shall be consider: inspection or maintenance 

programs for leaking containers or spills; covering dumpsters; moving waste 

management activities indoors; covering waste piles with temporary covering 

material such as tarpaulins or polyethylene; and, minimizing stormwater runoff by 

enclosing the area or building berms around the area. 

C. Visual Monitoring Requirements. (See also part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix AA 

Sector AA - Fabricated Metal Products. 

A. Covered Stormwater Discharges. The requirements for Sector AA apply to 

stormwater discharges associated with industrial activity from Fabricated Metal 

Products facilities as identified by the SIC Codes specified below. 

SECTOR AA: FABRICATED METAL PRODUCTS

3444-3499 Fabricated Metal Products, Except Machinery and Transportation Equipment 

3911-3915 Jewelry, Silverware, and Plated Ware 

B. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) The permittee shall identify areas where any 

of the following may be exposed to stormwater: raw metal storage areas; finished 

metal storage areas; scrap disposal collection sites; equipment storage areas; 

retention and detention basins; temporary or permanent diversion dikes or berms; 

right-of-way or perimeter diversion devices; sediment traps and other barriers; 

processing areas including outside painting areas; wood preparation; recycling; 

and, raw material storage. 

2. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) The 

permittee shall describe the following activities and potential pollutant sources: 

loading and unloading operations for paints, chemicals and raw materials; outdoor 

storage activities for raw materials, paints, empty containers, chemicals, and scrap 

metals; outdoor manufacturing or processing activities such as grinding, cutting, 

degreasing, buffing, brazing, etc; and, onsite waste disposal practices for spent 

solvents, sludge, pickling baths, shavings, ingots pieces, refuse and waste piles. 

3. Good Housekeeping Measures. Perform good housekeeping including 

implementation measures aimed at controlling and recovering scrap metals, 

metal-fines and iron dust. Include measures for containing materials within 

storage handling areas, as well as preventing the exposure of recyclable wastes. 

Also provide a narrative of the implementation measures aimed at preventing or 

minimizing the exposure of paint, paint chips and painting equipment to 

stormwater. If sandblasting operations are conducted at the facility, provide 

operating procedures that control blast media buildup and prevent the dispersion 

of blast media. Substitute hazardous chemicals used in the painting process with 

environmentally-friendly cleaners wherever possible. If lubricating oils or 

hydraulic fluids are used at the facility, consider monitoring equipment or other 

devices to detect and control leaks and overflows. The installation of perimeter 

controls such as dikes, curbs, grass filter strips or other equivalent measures must 

be considered in the areas where fluids and oils are used and applied. 
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4. Spill Prevention and Response Procedures. For each of the areas below the 

permittee shall provide a narrative of the implementation measures utilized for 

preventing spills and leaks; quick and effective remedial clean up of spills and 

leaks; and, provide employees with hands-on training related to cleanup 

techniques and procedures. In addition to the narratives required for each area, 

necessary cleanup equipment must be available to personnel in the below listed 

facility areas:

• Metal Fabricating Areas 

• Storage Areas for Raw Metal 

• Receiving, Unloading, and Storage Areas 

• Chemical Storage Areas 

• Storage of Equipment and Equipment Storage Area 

• Metal Working Fluid Storage Areas 

• Cleaners and Rinse Water 

When compiling the list of past spills and leaks, pay particular attention to the 

following metals, chemicals and compounds: chromium, toluene, pickle liquor, 

sulfuric acid, zinc and other water priority chemicals, hazardous chemicals and 

associated waste streams. 

C. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require numeric monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased. 
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Appendix AB 

Sector AB - Transportation Equipment, Industrial or Commercial Machinery 

A. Covered Stormwater Discharges. The requirements for Sector AB apply to 

stormwater discharges associated with Transportation Equipment, Industrial or 

Commercial Machinery facilities as identified by the SIC Codes specified below. 

SECTOR AB: TRANSPORTATION EQUIPMENT, INDUSTRIAL OR COMMERCIAL 

MACHINERY

3511-3599 (except 

3571-3579) 

Industrial and Commercial Machinery (except Computer and Office 

Equipment) (see Sector AC) 

3711-3799 (except 

3731, 3732) 

Transportation Equipment (except Ship and Boat Building and 

Repairing) (see Sector R) 

B. Limitations on Coverage. (See also Part I(E).) This General Permit does not 

authorize the discharges associated with equipment or vehicle wash water. A copy of 

the MEPDES permit issued for vehicle or equipment wastewater (or a copy of the 

pending application) must be attached or referenced in the SWPPP. If an industrial 

user permit is issued under a pretreatment program, attach a copy or reference in the 

SWPPP. 

C. Additional SWPPP Requirements and Non-Numeric Technology Based Effluent 

Limits.

1. Site Map. (See also Part V(D)(3).) The permittee shall identify areas where any 

of the following may be exposed to stormwater: all vents and stacks associated 

with metal processing and similar operations. 

2. Potential Pollutant Sources and Exposed Materials. (See also Part V(D)(4).) 

Describe and assess the potential for the following to contribute pollutants to 

stormwater: onsite fluid and waste fluid storage or disposal; parking areas for 

vehicles awaiting maintenance; activities associated with mechanical repairs; 

metal or fiberglass processing, grinding, painting or fabrication; used battery 

storage and fueling areas. 

3. Inspections. (See also Part V(I).) The permittee shall inspect storage areas for 

vehicles and equipment awaiting maintenance; fueling areas; indoor and outdoor 

vehicle or equipment maintenance areas; material storage areas; vehicle or 

equipment cleaning areas; vents and stacks associated with metal or fiberglass 

processing, grinding, sanding or painting; and loading and unloading areas. 

4. Good Housekeeping Measures. (See also Part V(D)(9)(a).) Perform good 

housekeeping which includes the following areas and activities: 
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Vehicle and Equipment Storage Areas. Leaky or leak-prone vehicles or 

equipment awaiting maintenance must be confined to designated areas. Use drip 

pans or absorbent pads under leaking vehicles and equipment. Store vehicles and 

equipment scheduled for maintenance inside or under cover if possible, or on an 

impervious surface such as concrete or asphalt if stored outside. 

Fueling Areas. Prevent or minimize stormwater contamination from fueling areas 

by immediately cleaning up drips and spills with absorbent pads or dry absorbent 

materials. The facility must have a spill kit on site. Consider covering the fueling 

area with an overhang or extended roof area. 

Vehicle and Equipment Cleaning Areas. The discharge of vehicle or equipment 

wash water is not authorized under this General Permit. Consider performing all 

washing or cleaning operations indoors in a dedicated wash bay where the wash 

water is either pumped to a holding tank or sent to the sanitary sewer. The latter 

may require a pre-treatment agreement with the POTW. Outdoor washing is 

allowed if there is no discharge to a stormwater conveyance or a surface water, 

and there is no engine washing or the use of acids bases or degreasers. 

Vehicle and Equipment Maintenance Areas. Implement measures to prevent or 

minimize contamination of stormwater with fluids, grease, or particulate matter 

from grinding or sanding. Consider performing maintenance activities indoors 

and use drip pans or other absorbent materials for drips and spills. Maintain an 

organized inventory of materials used in the shop; drain all parts of fluid prior to 

disposal. Maintain a dry indoor maintenance shop and prohibit wet clean up 

practices. 

Material Storage Areas. Maintain all liquid material storage vessels free of debris 

or residue for products and waste products to prevent contamination of 

stormwater. Plainly label all waste product containers (e.g., “Used Oil,” “Spent 

Solvents,” etc.). Consider storing the materials indoors with proper secondary 

containment. Barrels stored outside must residue free and stored on pallets while 

awaiting transport for indoor use or for proper disposal. Outdoor storage of 

barrels must be inspected weekly for spills or leaks. 

5. Employee Training. (See also Part V(D)(9)(a).) Provide annual training to 

address, as applicable: spill response and safety procedures, used oil and spent 

solvent storage and management; fueling procedures; general good housekeeping 

practices for painting, grinding, sanding and metal or fiberglass fabrication, and 

welding; and, used battery storage, containment and management. 

D. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 
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Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

numeric monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require numeric monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased.
2011 MSGP 

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Appendix AC 

Sector AC - Electronic, Electrical Equipment and Components, Photographic 

and Optical Goods

A. Covered Stormwater Discharges. The requirements for Sector AC apply to 

stormwater discharges associated with Electronic, Electrical Equipment and 

Components and Photographic and Optical Products facilities as identified by the SIC 

Codes specified below.

SECTOR AC: ELECTRONIC, ELECTRICAL, PHOTOGRAPHIC, AND OPTICAL 

GOODS

3571-3579 Computer and Office Equipment 

3612-3699 Electronic, Electrical Equipment and Components, except Computer Equipment 

3812 Measuring, Analyzing and Controlling Instruments, Photographic and Optical 

Goods 

B. Visual Monitoring Requirements. (See also Part VI.) Visual monitoring must be 

conducted quarterly during a qualifying storm event. Collect a grab sample for visual 

monitoring analysis from each outfall that has an associated industrial activity within 

the outfall’s drainage area. The outfall(s) must be sampled quarterly unless the 

facility has representative outfalls. 

Visual monitoring requirements are waived if the facility is in compliance with and 

can demonstrate participation in the implementation of an established Department 

Approved Watershed Management Plan; or if the facility is conducting Benchmark, 

Impaired Waters sampling and analysis, or Numeric Monitoring for Total Suspended 

Solids (TSS). Visual monitoring is only waived for the outfall(s) associated with 

Numeric Monitoring. The permittee shall conduct quarterly visual monitoring at 

outfalls that do not require Numeric Monitoring. 

Visual monitoring must be resumed if Benchmark Monitoring, Numeric 

Monitoring or Impaired Waters sampling is ceased.
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Appendix AD 

Sector AD - Stormwater Discharges Designated By the Department Requiring 

Permits.

A. Covered Stormwater Discharges. Sector AD is reserved for facilities that do not 

meet the descriptive requirements of an established industrial activity presently 

covered by Sectors A - AC and those which are designated by the Department as 

necessitating a stormwater permit for industrial stormwater discharges. This 

reserved Sector could allow for almost any type of stormwater discharge, as 

deemed required by the Department. A permittee must be assigned to Sector AD 

by the Department and may NOT choose sector AD when filing a Notice of Intent 

(NOI) or describing the activities conducted at the facility. 

B. Eligibility for Permit Coverage. Because this Sector only pertains to discharges 

designated by the Department as necessitating a stormwater permit due to atypical 

circumstances presented by the facility which may effect stormwater quality or 

the facility’s industrial activities were inadvertently left out of Sectors A-AC, and 

further, the facility may not normally be discharging stormwater associated with 

industrial activity, the permittee is required to obtain the Department’s written 

permission to use this reserved permit prior to submitting a Notice of Intent. If 

the permittee is authorized to use this permit, the permittee will be required to 

ensure that the discharges meet the basic eligibility provisions of this permit in 

Part I (B). 

C. Stormwater Pollution Prevention Plan (SWPPP) Requirements. (See also Part V.) 

The Department will establish any additional SWPPP requirements for the facility 

at the time of accepting the Notice of Intent to be covered by this reserved permit. 

Additional requirements are based on the nature of activities at the facility and the 

stormwater discharges. 

D. Monitoring and Reporting Requirements. (See also Part VI and Part V(I).) The 

Department will establish any additional monitoring, inspection and reporting 

requirements at acceptance of the Notice of Intent. Additional permit 

requirements would be based on the nature of industrial activities at the facility 

and the stormwater discharges.