PERMIT RATIONALE FOR REISSUANCE

MacLand Disposal Center Inc  
Jackson County
Moss Point, Mississippi
NPDES Storm Water Permit No. MS0044067
March 14, 2025

I.	FACILITY INFORMATION

Facility Name:  	MacLand Disposal Center Inc    
Facility Address:  	11300 Highway 63 North   
	Moss Point, MS  39562    
Ridgeland, 
Permit No.:  		MS0044067  
SIC Code:  		4953 – Refuse Systems  
Permit Writer:  	Carter Cress
EPD Branch:  		Water II    

II.	NATURE OF BUSINESS

This facility is an industrial solid waste landfill.  

III.	EFFLUENT AND RECEIVING STREAM FLOW DATA

Outfall No.	Discharge Type	Total Area Drained	Receiving Stream	Current Status	
001	Storm water	81 acres	unnamed tributary of Black Creek	Constructed	

The discharges from Outfall 001 consist of storm water runoff associated with the construction, development, and operation of the municipal landfill, except for working face runoff and leachate.  The storm water runoff is collected and treated in a sedimentation pond prior to discharge.    

The facility is located in the Pascagoula River Basin.  The receiving stream is classified as Fish and Wildlife.    

IV.	TOTAL MAXIMUM DAILY LOAD (TMDL) AND 303(d) ISSUES

Black Creek is listed on the Mississippi 2024 Section 303(d) List of Impaired Water Bodies. It is listed for “biological impairment.”  However, this TMDL applies to the portions of Black Creek in the counties of Jefferson Davis, Marion, and Lamar.  The facility is located in Jackson County. 

The permit complies with the following completed TMDLs:

1. Report ID No. Unknown – Black Creek – Perry, Stone, and George Counties – Fecal Coliform – July 2012

2. Report ID No. 405031801 – Pascagoula River – Mercury – March 2005  

3. Report ID No. 499121505 – Pascagoula River – Black Creek Watershed – Fecal Coliform – December 1999

V.	TYPE OF WASTEWATER TREATMENT

A sedimentation pond with aeration is associated with the outfall.      

VI.	EPA APPLICABLE CATEGORICAL GUIDELINES

Not applicable.  

VII.	DATA FROM APPLICATION FORM 2F

Outfall 001	
Parameter	Maximum Daily Discharge	
Oil and Grease	< 5.00 mg/L	
Biochemical Oxygen Demand (BOD5)	548 mg/L	
Chemical Oxygen Demand (COD)	1,150 mg/L	
Total Suspended Solids (TSS)	85 mg/L	
Total Nitrogen	93.2 mg/L	
Total Kjeldahl Nitrogen (TKN)	122 mg/L	
Total Phosphorus	0.428 mg/L	
pH (minimum)	6.69 SU	
pH (maximum)	6.69 SU	

VIII.	DATA FROM DISCHARGE MONITORING REPORTS (DMRS)

Outfall 001	
Parameter 	Year 2022	Year 2023	Year 2024	
Annual Average Chemical Oxygen Demand	139 mg/L	73.2 mg/L	35.85 mg/L	
Annual Maximum Chemical Oxygen Demand	169 mg/L	75 mg/L	38.3 mg/L	
Annual Average Total Suspended Solids	12.6 mg/L	12.15 mg/L	16.28 mg/L	
Annual Maximum Total Suspended Solids	13.7 mg/L	12.2 mg/L	23.2 mg/L	
Minimum pH	7.1 SU	7.1 SU	6.9 SU	
Maximum pH  	7.3 SU	7.3 SU	7.3 SU	
	
IX. 	WATER QUALITY LIMITATIONS BASED ON WASTELOAD ALLOCATION 

	Not applicable.  

X.        CATEGORICAL GUIDELINE LIMITATIONS CALCULATIONS

Not applicable.  

XI.       TOXICITY SCREENING

Not applicable.  

XII.	PROPOSED FINAL LIMITATIONS 

Average Permit Limitations	
Outfall No.	Parameter	Categorical Limitation	Water Quality Limitation	Current Permit Limitation	Proposed Permit Limitation	Basis1	
001	COD	N/A	N/A	Report mg/L	Report mg/L	CPL	
	TSS	N/A	N/A	Report mg/L	Report mg/L	CPL	
	Turbidity 	N/A	***	---	Report NTU	BTJ	
	pH (minimum)	N/A	6.0 SU	6.0 SU	6.0 SU	MSWQS	

Maximum Permit Limitations	
Outfall No.	Parameter	Categorical Limitation	Water Quality Limitation	Current Permit Limitation	Proposed Permit Limitation	Basis1	
001	COD	N/A	N/A	Report mg/L	Report mg/L	CPL	
	TSS	N/A	N/A	90 mg/L	90 mg/L	CPL  	
	Turbidity	N/A	***	---	Report NTU	BTJ	
	pH 	N/A	9.0 SU  	9.0 SU	9.0 SU	MSWQS	

1 Basis: CPL = Current Permit Limitation; BTJ = Best Technical Judgment; MSWQS = Mississippi Water Quality Standard.  

***Turbidity outside the limits of a 750-foot mixing zone shall not exceed the background 
      turbidity at the time of discharge by more than 50 NTU. 

All parameters shall be monitored via grab sampling semi-annually.  All monitoring results shall be submitted on an annual DMR.  

To maintain consistency with other municipal solid waste landfill storm water NPDES permits, turbidity has been re-instated as a monitored parameter.  Turbidity had been removed as a monitored parameter when the current permit was re-issued in July 2020.  

The following conditions have been added to the proposed permit: 

Condition L-1 on page 1:

Provide and maintain a 50-foot undisturbed natural buffer around waters of the United States; or provide and maintain an undisturbed natural buffer that is less than 50 feet and is supplemented by additional erosion and sediment controls which in combination achieves the sediment load reduction equivalent to a 50-foot undisturbed natural buffer. Direct storm water to vegetated areas and maximize storm water infiltration to reduce pollutant discharges, unless infeasible.  [11 Miss. Admin. Code Pt. 6, Ch. 1, Subch. 1.]  
Condition L-2 on page 1:

The discharge shall be free from substances attributable to municipal, industrial, agricultural or other discharges that will settle to form putrescent or otherwise objectionable sludge deposits.  [11 Miss. Admin. Code Pt. 6, R. 2.2.A(1).]

Condition L-3 on page 1:

The discharge shall be free from materials attributable to municipal, industrial, agricultural or other discharges producing color, odor, taste, total suspended or dissolved solids, sediment, turbidity, or other conditions in such a degree as to create a nuisance, render the waters injurious to public health, recreation or to aquatic life and wildlife or adversely affect the palatability of fish, aesthetic quality, or impair the waters for any designated use.  [11 Miss. Admin. Code Pt. 6, R. 2.2.A(3).]

Condition L-4 on page 1:

The discharge shall be free from substances attributable to municipal, industrial, agricultural or other discharges in concentrations or combinations that are toxic or harmful to humans, animals or aquatic life.  [11 Miss. Admin. Code Pt. 6, R. 2.2.A(4).]

The following eight conditions have been altered in the proposed permit.  Alterations are identified using bold text:

Condition T-16 on page 12:

Minimum SWPPP Components/Description of Potential Pollutant Sources (continued)

(5) A detailed scaled site map showing the following features:
(A) The property layout with property and facility boundaries (barrow area(s), permitted disposal area(s), haul road(s), etc.),
(B) North arrow,
(C) Surface water bodies,
(D) Drainage area of each storm water outfall identified by number,
(E) Direction of flow for each area (designated by arrow),
(F) Location and a description of existing structural and nonstructural control measures to reduce pollutants in storm water runoff,
(G) Location of any storm water treatment activities,
(H) Location of industrial activities, such as:
(i) Fuel storage and dispensing locations,
(ii) Vehicle/equipment repair, maintenance and cleaning areas,
(iii) Materials storage and handling areas,
(iv) Leachate loading areas,
(I) Location of housekeeping practices, 
(J) If flocculant application is proposed, the location(s) of the flocculant introduction point(s) and BMPs where flocculated material will settle,
(K) Storm water conveyances (ditches, pipes, & swales) including sensitive areas such as wetlands, 
(L) Buffer zone compliance,
(M) Original and proposed contours (if applicable), 
(N) All erosion and sediment controls (vegetative and structural), and
(O) The type, location, and controls used for all recyclable material being stored on site (i.e. concrete, wood, metal, etc.).  [11 Miss. Admin. Code Pt. 6, Ch. 1, Subch. 1.]

Condition T-17 on page 13: 

Minimum SWPPP Components/Description of Potential Pollutant Sources (continued) 

(6) A topographic map extending at least 1/2 mile beyond the facility property boundaries. 

(7) The SWPPP must identify any allowable non-storm water discharges. Non-storm water discharges should be eliminated or reduced to the extent feasible. The SWPPP must identify and ensure the implementation of appropriate Best Management Practices (BMPs) for the non-storm water component of the discharge. Allowable non-storm water discharges provided they do not cause or contribute to a violation of water quality standards are as follows:
(A) Routine external building wash down that does not use detergents
(B) Pavement wash waters where spills or leaks of toxic or hazardous materials have not occurred (unless all spilled material has been removed) and where detergents are not used 
(C) Uncontaminated air conditioning or compressor condensate
(D) Incidental windblown mist from cooling towers that collects on rooftops or adjacent portions of the facility, but NOT intentional discharges from the cooling tower (e.g., "piped" cooling tower blowdown or drains)
(E) Uncontaminated ground water or spring water.  [11 Miss. Admin. Code Pt. 6, Ch. 1, Subch. 1.]

Condition T-18 on pages 13 and 14:  

Minimum SWPPP Components/Description of Storm Water Management Controls

The permittee shall describe appropriate storm water management controls addressing identified potential pollution sources and implement such controls. The description shall include a schedule for implementing the following minimum components:

(1) Pollution Prevention Manager/Committee. The SWPPP shall specify individual(s) responsible for developing the SWPPP and assisting the facility manager in its implementation, maintenance, and revision.

(2) Sediment and Erosion Prevention. The permittee shall design, install, and maintain controls in accordance with the standards set forth in the most recent edition of Mississippi's "Erosion Control, Sediment Control and Stormwater Management on Construction Sites and Urban Areas (Three Volumes)," or other recognized manuals for storm water controls design, or provide a design that has been certified by a Mississippi registered professional engineer. “Erosion Control, Sediment Control and Stormwater Management on Construction Sites and Urban Areas (Three Volumes)” can be accessed at www.mdeq.ms.gov/industrial-stormwater. These controls shall be appropriate for the facility’s disposal and ancillary operations to prevent such materials from entering state waters and in a manner consistent with the Mississippi Solid Waste Disposal Act, the Federal Resource Conservation and Recovery Act, and the Mississippi Water Pollution Control Act.
The SWPPP shall list and describe site-specific controls appropriate for the construction activities as well as the procedures for implementing such controls. Controls shall be designed, installed, and maintained to retain sediment on-site and to minimize the discharge of pollutants. The SWPPP shall provide temporary stabilization (e.g. temporary seeding, mulching, and placing geotextiles on the inactive portions of stockpiles) for the following in order to minimize discharges of pollutants in stormwater; materials stockpiled for daily, intermediate, and final cover; inactive areas of the landfill or open dump; landfills or open dump areas that have gotten final covers but where vegetation has yet to be established itself; and land application sites where waste application has been completed but final vegetation has not yet been established. If any of the below controls cannot be implemented on the site, the SWPPP must include written justification as to why site specific constraints and/or costs make the control(s) infeasible. At a minimum, such controls must be designed, installed and maintained to:
(A) Control storm water volume and velocity within the site to minimize soil erosion;
(B) Control storm water discharges, including both peak flow rates and total storm water volume, to minimize erosion at outlets and to minimize downstream channel and stream bank erosion;
(C) Minimize the amount of soil exposed during the facility’s activity;
(D) Minimize the disturbance of steep slopes;
(E) Minimize sediment discharges from the site. The design, installation and maintenance of erosion and sediment controls must address factors such as the amount, frequency, intensity and duration of precipitation, the nature of resulting storm water runoff, and soil
characteristics, including the range of soil particle sizes expected to be present on the site;
(F) Provide and maintain natural buffers around surface waters, direct storm water to vegetated areas to increase sediment removal and maximize storm water infiltration, unless infeasible;
(G) Minimize soil compaction and, unless infeasible, preserve topsoil;
(H) Direct storm water to vegetated areas, brush barriers, silt fences, hay bales, etc. to aid in the filtration, infiltration, velocity reduction and diffusion of the discharge;
(I) Transport runoff down steep slopes through lined channels or piping;
(J) Minimize off-site vehicle tracking of sediments.  [11 Miss. Admin. Code Pt. 6, Ch. 1, Subch. 1.]

Condition T-19 on page 15:

Minimum SWPPP Components/Description of Storm Water Management Controls (continued)

(3) Preventive Maintenance. A preventive maintenance program shall involve inspection and maintenance of storm water management devices (cleaning oil/water separators, catch basins, etc.) and the inspecting and testing of equipment to preclude breakdowns or failures that may cause pollution.  [11 Miss. Admin. Code Pt. 6, Ch. 1, Subch. 1.]

(4) Good Housekeeping. The permittee shall describe and list practices appropriate to prevent pollutants from entering storm water from industrial and construction activities due to poor housekeeping. The permittee shall:
(A) Designate areas for equipment maintenance, washing repair and minimize the discharge of pollutants from these areas;
(B) Provide protected storage areas for chemicals, paints, solvents, fertilizers, and other potentially toxic materials;
(C) Provide secondary containment around any on-site single fuel or chemical container with a capacity greater than 660 gallons or any combination of containers which has an above ground bulk storage capacity of more than 1,320 gallons; 
(D) Sweeping or removal of sediment and other debris that has been tracked from the site or deposited from the site onto streets and other paved surfaces; 
(E) Removal of sediment or other pollutants that have accumulated in or near any sediment control measures, storm water conveyance channels, storm drain inlets, or water course conveyance within the site, and; 
(F) Removal of accumulated sediment that has been trapped by sediment control measures at the site. 

(5) Employee Training. The permittee shall develop and implement a training program and the SWPPP shall specify periodic training for personnel that are responsible for implementing and/or complying with the requirements of the SWPPP. Training shall be provided to all personnel that are responsible for implementing and/or complying with the requirements of this permit prior to personnel performing such responsibilities. All employees responsible for implementing and/or complying with the requirements of this permit shall receive refresher training annually. Training shall be documented and shall include employee's name, worker identification number, date of training, contents of training, and the employee's signature acknowledging that training was received. All personnel training shall be documented on the attached Employee Training Log form (or equivalent form), filed on-site with the SWPPP, and made available to MDEQ personnel for inspection upon request.  [11 Miss. Admin. Code Pt. 6, Ch. 1, Subch. 1.]  

Condition T-20 on page 16:

Minimum SWPPP Components/Description of Storm Water Management Controls (continued)

(6) Visual Site Inspections. Visual site inspections shall be performed by an authorized authority listed in the Employee Training Log to ensure the effectiveness of the SWPPP's design and implementation, must evaluate whether the SWPPP is being properly implemented in accordance with the terms of this permit or whether additional control measures are needed, and must make sure storm water discharges are free from objectionable characteristics such as color, lack of clarity, floating solids, settled solids, suspended solids, foam, odor and oil sheens. The SWPPP shall describe the policy and procedures for visual site inspections, describe procedures to maintain erosion and sediment controls and other protective measures, and include frequencies and areas to be inspected. All areas contributing to stormwater discharges associated with industrial activity (including, but not limited to, ground storage piles, tanks, hoppers, silos, dust containment/collection systems, cleaning and maintenance areas) must be visually inspected as often as needed, but no less than once monthly. All structural and non-structural controls, and all outfalls/discharge points are to be inspected after rain events that produce a discharge and at least weekly for all areas not stabilized. Any stabilized area (i.e. - permanent vegetation established on exposed soils) may be inspected monthly. Any poorly functioning controls or other deficiencies must be corrected as soon as practicable. These areas must be checked for evidence of pollutants entering the storm water drainage system and identify conditions which may give rise to contamination of storm water runoff. The results of all monthly visual site inspections shall be documented on the attached Monthly Inspection / Visual Evaluation Report (or equivalent form). 

(7) Structural Practices. Structural practices shall divert flows from exposed soils, store flows or otherwise limit runoff from exposed areas. Such practices may include, but are not limited to, silt fences, earth dikes, brush barriers, drainage swales, check dams, subsurface drains, pipe slope drains, level spreaders, drain inlet protection, outlet protection, detention/retention basins, sediment traps, temporary sediment basins or equivalent sediment control.
(A) For drainage locations (a drainage point at boundary of land disturbing activity) that serve an area with ten (10) or more disturbed acres at one time, a temporary (or permanent) sediment basin providing at least 3,600 cubic feet (133 cubic yards) of storage per acre drained shall be provided until final stabilization of the site. Sediment basins must be installed before initial site grading and utilize outlet structures that withdraw water from the surface and that are designed for a minimum 2-year, 24-hour storm event.
(B) Construction entrances/exits shall be installed wherever traffic will be leaving a construction site and moving directly onto a paved public road.
(C) Storm Drain Inlets-Inlets that could receive storm water from construction activities shall be protected by surrounding or covering with a filter material until “close-out” has been achieved. 
(D) Perimeter Controls-Natural areas shall be maintained and supplemented with silt fence and fiber rolls around project perimeter. If not feasible to maintain natural areas, a silt fence or similar controls, such as fiber rolls, are sufficient.  [11 Miss. Admin. Code Pt. 6, Ch. 1, Subch. 1.]

Condition T-21 on page 17:

Minimum SWPPP Components/Description of Storm Water Management Controls (continued)

(8) Vegetative practices. Vegetative practices shall be designed to preserve existing vegetation where possible and re-vegetate disturbed areas as soon as practicable after clearing, grading, excavating or other land disturbing activities. Such practices may include, but are not limited to, surface roughing, temporary seeding, permanent seeding, mulching sod stabilization, vegetative buffer strips, protection of trees, and topsoil preservation.

(9) Implementation Sequence and Final Stabilization. The SWPPP shall describe an implementation sequence for the development, use, and closure of individual waste management unit within the rubbish facility. Additionally, the SWPPP shall describe a plan for the final vegetative stabilization of the site whereby exposed areas must be stabilized using structural and/or non-structural control measures. 

(10) Implementation of Controls. The SWPPP shall require the owner/operator during facility construction, and subsequent facility cell construction, (e.g., clearing and grubbing) to implement controls necessary to mitigate erosion and adverse impacts to offsite areas and receiving streams. During facility operations, vegetative and structural practices shall be maintained as set forth in the approved SWPPP.  [11 Miss. Admin. Code Pt. 6, Ch. 1, Subch. 1.]
Condition T-25 on page 20:

Sample Type

For discharges from impoundments with a retention period greater than 24 hours (estimated by dividing the volume of the impoundment by the estimated volume of water discharged during the 24 hours prior to sampling), only one grab sample need be taken. For other discharges, a grab sample during the first 30 minutes (or as soon thereafter as practicable) and a composite sample shall be taken. pH and other parameters requiring a grab sample should only be measured in the grab sample. When a grab sample during the first 30 minutes is impracticable an explanation shall be included with the Discharge Monitoring Report. The composite sample shall either be flow-weighted or time-weighted. Composite samples may be taken with a continuous sampler or as a combination of a minimum of 3 sample aliquots taken in each hour for the first 3 hours or entire discharge, with each aliquot being separated by a minimum period of 15 minutes. The sampled discharge must result from a storm greater than 0.1 inches in magnitude and occurring at least 72 hours from the previously measurable (greater than 0.1inch rainfall) storm. Sampling test procedures shall be in accordance with the methods set forth in 40 CFR Part 136.  [40 CFR 122.21g(7)(ii)]  

Condition T-28 on page 20: 

Representative Sampling

Samples and measurements taken as required herein shall be representative of the volume and nature of the monitored wastewater.  The first discharge that occurs each six-month period must be sampled. At least one discharge resulting from a storm greater than 0.1 inches in magnitude and occurring at least 72 hours from a previously measurable storm greater than 0.1 inch rainfall must also be sampled. If such an event does not occur, then only the first sampled discharge test results shall be included in the calculation and reporting of the data submitted for that six-month period.  [11 Miss. Admin. Code Pt. 6, R. 1.1.4.A(28)(e).]