PRETREATMENT RATIONALE FOR ISSUANCE

Hood Industries Inc., Waynesboro
Wayne County
Waynesboro, MS
Water II Branch

Permit No. MSP092487
SIC: 2421
April 20, 2026
Permit Engineer: Rajeev Gupta

I.	FACILITY INFORMATION

A.	Nature of Business: Lumber Mill
B.	Process Wastewater Description: Kiln Condensate from CDK’s.
C.	Proposed Flowrate: 0.032 MGD (Dail Maximum)
D.	Applicable Federal Guidelines: 40 CFR Part 429: Timber Products Processing Point Source Category; Subpart K – Sawmills and Planing Mills Subcategory; 429.126 (PSNS).  Any new source subject to this subpart which introduces process wastewater pollutants into a publicly owned treatment works must comply with 40 CFR part 403.
E.	Wastewater Treatment: Resin Filters are proposed to treat the wastewater prior to discharge to the sanitary sewer system.          

II.	RECEIVING POTW INFORMATION

A.	POTW and Permit Number: Waynesboro POTW, 13446, MS0024228      
B.	POTW Treatment Type: Municipal wastewater is collected and treated biologically by means of an activated sludge plant/oxidation ditch followed by chlorine disinfection prior to discharge.           
C.	POTW Design Flowrate: 2.25 MGD (Monthly Average)     
D.	POTW Receiving Stream: Patton Creek
E.	POTW Receiving Stream 7Q10 (Q7/10): 0.78 MGD

III.	PERTINENT FLOWRATE AND LOADING DATA

A.	POTW 12-month Average Flowrate (QPOTW):0.765 MGD (2025 Calendar Year)
B.	Industrial Facilities Maximum 30-day Average Flow (QIND) for Contributing Pollutants: None Permitted 
C.	Industrial Facilities Permitted/Requested Flow in MGD (QW):

Facility 
(Permit No., AI No.)	As	Cr	Cu	Ni	Zn	Al	Fe	
Hood Industries Inc. Waynesboro	0.032	0.032	0.032	0.032	0.032	0.032	0.032	
Total,  QT (MGD)	0.032	0.032	0.032	0.032	0.032	0.032	0.032	

IV.	BACKGROUND/DOMESTIC LOADING CALCULATIONS

Background Loading (BGL), lb/d = 8.34 x BGC(mg/L)(1) x (QPOTW - QINDUSTRIAL(2))(MGD)

1 BGC = Background concentration of domestic sewage.  There are no industrial facilities discharging to Waynesboro POTW.  As a result, the background concentration for the pollutants of concern is an average of the influent data provided in Table A. Background concentration data for Iron is not available for the Waynesboro POTW.  Iron background concentration level is based on data found in Appendix V of Local Limits Development Guidance (EPA 833-R-04-002A, July 2004).    Aluminum background concentration level based on data found in Agency for Toxic Substances and Disease Registry (ATSDR) Toxicological Profiles, Toxicological Profile for Aluminum, September 2008, Table 6-3.  The background Aluminum concentration used is based on a review of the data for the State of Louisiana Aluminum levels reported in this table and further discussion found on page 195 of this document.  

2 QINDUSTRIAL = QW1 + QW2 + …
where QW is the largest average flowrate from the DMR over the last twelve months.  (Maximum daily flow data may be used when monthly average data is not available.)

BGL (As) = 0.000828 mg/L* 8.34* 0.765 MGD = 0.00528 lb/day
BGL (Cr) = 0.000859 mg/L* 8.34* 0.765 MGD = 0.00548 lb/day
BGL (Cu) = 0.024942 mg/L * 8.34* 0.765 MGD = 0.159 lb/day
BGL (Ni) = 0.00133 mg/L* 8.34* 0.765 MGD = 0.00848 lb/day
BGL (Zn) = 0.06115 mg/L*8.34* 0.765 MGD = 0.390 lb/day
BGL (Al) = 0.100 mg/L*8.34* 0.765 MGD = 0.638 lb/day
BGL (Fe) = 0.989 mg/L*8.34* 0.765 MGD = 6.31 lb/day

V.	WATER QUALITY ANALYSIS

Instream Wastewater Concentration IWC, % = QPOTW / (QPOTW + Q7/10) x 100

IWC % = [0.765/(0.765 + 0.78)]*100 = 49.5 %

Acute and Chronic screenings are performed because the IWC > 1%.

A.	AHL, Water Quality Criteria Based (AHLWQC)

AHLWQC, lb/day = 8.34 x CCRITERIA (mg/L) x (Q7/10 + QPOTW, MGD) / (1 – RPOTW)

.
CCRITERIA = Water Quality Criteria; obtained from State of Mississippi Water Quality Criteria for Intrastate, Interstate, and Coastal Waters: Freshwater Acute and Chronic Values.  

RPOTW = Removal efficiency, in decimal form.  Values obtained from Appendix A.   For Iron and Aluminum, no data is available and complete pass through is assumed.

Chronic Analysis, AHLCWQC:
AHLCWQC (As) = 8.34*0.150 *(0.765+0.78)/(1-0.323) = 2.853 lb/day
AHLCWQC (Cr) = 8.34*0.042*(0.765+0.78)/(1-0.651) = 1.55 lb/day
AHLCWQC (Cu) = 8.34*0.005*(0.765+0.78)/(1-0.675) = 0.198 lb/day
AHLCWQC (Ni) = 8.34*0.029*(0.765+0.78)/(1-0.351) = 0.576 lb/day
AHLCWQC (Zn) = 8.34*0.065*(0.765+0.78)/(1-0.756) = 3.433 lb/day
AHLCWQC (Al) = 8.34*0.140*(0.765+0.78)/(1-0) = 1.80 lb/day
AHLCWQC (Fe) = 8.34*1.0*(0.765+0.78)/(1-0) = 12.88 lb/day

Acute Analysis, AHLAWQC:
AHLAWQC (As) = 8.34*0.340*(0.765+0.78)/(1-0.323) = 6.468 lb/day
AHLAWQC (Cr) = 8.34*0.323*(0.765+0.78)/(1-0.651) =11.92 lb/day 
AHLAWQC (Cu) = 8.34*0.007*(0.765+0.78)/(1-0.675) = 0.277 lb/day
AHLAWQC (Ni) = 8.34*0.260*(0.765+0.78)/(1-0.351) = 5.16  lb/day
AHLAWQC (Zn) = 8.34*0.065*(0.765+0.78)/(1-0.756) = 3.433 lb/day
AHLAWQC (Al) = 8.34*0.250*(0.765+0.78)/(1-0) = 3.22 lb/day

B.	AHL, POTW Inhibition Based (AHLINH)

AHLINH, lb/day = 8.34 x QPOTW (MGD) x CINH (mg/L)

CINH = Activated Sludge Inhibition Levels, from Appendix G of Local Limits Development Guidance (EPA 833-R-04-002A, July 2004).  For all parameters, except for Arsenic, 1.0 mg/L is used since this value is near the minimum side of the minimum reported range of inhibition threshold levels.  Inhibition threshold levels could not be found for Iron and Aluminum.

	AHLINH (As) = 8.34*0.765*0.1 = 0.638 lb/day
	AHLINH (Cr) = 8.34*0.765*1.0 = 6.38 lb/day
	AHLINH (Cu) = 8.34*0.765*1.0 = 6.38 lb/day
	AHLINH (Ni) = 8.34*0.765*1.0 = 6.38 lb/day
	AHLINH (Zn) = 8.34*0.765*1.0 = 6.38 lb/day
	
C.	AHL, POTW NPDES Permit Limit Based (AHLNPDES)

AHLNPDES, lb/day = (8.34 x QPOTW (MGD) x CPOTW (mg/L)) / (1 – RPOTW)

CPOTW = POTW NPDES permit concentration limit
If the POTW has a limit for a specific parameter, industrial loading is limited to the amount the POTW can accept and still meet the limit.  The POTW’s permit contains concentration limits only for Total Recoverable Copper.  However, the facility has a monthly average flow limit of 2.25 MGD.

AHLCNPDES (Cu) = (0.00667 mg/L * 8.34 *2.25)/(1- 0.675)= 0.385 lbs/day
AHLANPDES (Cu) = (0.00942 mg/L * 8.34 *2.25) /(1- 0.675) = 0.546 lbs/day

I.	
VI.	MAXIMUM ALLOWABLE HEADWORKS LOADINGS AND LIMITING CASE

Parameter	AHLINH (lb/day)	AHLCWQC (lb/day)	AHLAWQC (lb/day)	AHLCNPDES (lb/day)	AHLANPDES (lb/day)	MAHLC
(lb/day)	MAHLA
(lb/day)	BGL (lb/day)	LC
(lb/day)	Allocation Available
(BGL < LC)	
Arsenic	0.638	2.853	6.468	None	None	0.638	0.638	0.00528	0.638	Allocation	
Chromium	6.38	1.55	11.92	None	None	1.55	6.38	0.00548	1.55	Allocation	
Copper	6.38	0.198	0.277	0.385	0.546	0.198	0.277	0.159	0.385	Allocation	
Nickel	6.38	0.576	5.16	None	None	0.576	5.16	0.00848	0.576	Allocation	
Zinc	6.38	3.433	3.433	None	None	3.433	3.433	0.390	3.433	Allocation	
Aluminum	---	1.80	3.22	None	None	1.80	3.22	0.638	1.80	Allocation	
Iron	---	12.88	---	None	None	12.88	---	6.31	12.88	Allocation	
MAHLC = smallest chronic LAHL = comparison of AHLINH, AHLCWQC, and AHLCNPDES
    MAHLA = smallest acute LAHL = comparison of AHLINH, AHLAWQC, and AHLANPDES
    LC = smallest of MAHLC and MAHLA

VII.	DEVELOPMENT OF ALLOWABLE CONCENTRATIONS

The remaining industrial wasteload allocation will be used in calculating allowable acute and chronic concentrations using the “Industrial User (IU) Contributory Flow” method as described in EPA’s Local Limits Development Guidance (EPA 833-R-04-002A, July 2004).

PAI, lb/day = (MAHL, lb/day – BGL, lb/day) x (QW, MGD / QT, MGD)

CALLOW, mg/L = (PAI, lb/day) / (8.34 x QW, MGD)

PAI	= 	Permit allocation for indirect discharger
CALLOW	= 	Allowable concentration for indirect discharger
QW		= 	Applicant’s permitted/requested process discharge
QT 		= 	Total industrial contributory flow for pertinent pollutants
MAHL		= 	MAHLC to be used for chronic and MAHLA used for acute
BGL		=	Background/domestic loading

	CHRONIC (Average):

	PAI (As) = 0.638-0.00528)*(0.032/0.032) =		0.632 lb/day
	CALLOW (As) = 0.632/(8.34*0.032) =			2.37 mg/L

	PAI (Cr) = (1.55-0.00548)*(0.032/0.032) =		1.544 lb/day
	CALLOW (Cr) = 1.544/(8.34*0.032) =			5.785 mg/L

PAI (Cu) = (0.198-0.159)*(0.032/0.032) =		0.039 lb/day
	CALLOW (Cu) = 0.039/(8.34*0.032) =			0.146 mg/L

PAI (Ni) = (0.576-0.00848)*(0.032/0.032) =		0.567 lb/day
	CALLOW (Ni) = 0.567/(8.34*0.032) =			2.124 mg/L

	PAI (Zn) = (3.433-0.39)*(0.032/0.032) =		3.043 lb/day
	CALLOW (Zn) = 3.043/(8.34*0.032) =			11.4 mg/L

	PAI (Al) = (1.8-0.638)*(0.032/0.032) =		1.162 lb/day
	CALLOW (Al) = 1.162/(8.34*0.032) =			4.35 mg/L
	PAI (Fe) = (12.88-6.31)*(0.032/0.032) =		6.57 lb/day
	CALLOW (Fe) = 6.57/(8.34*0.032) =			24.618 mg/L

	ACUTE (Maximum):

	PAI (As) = (0.638-0.00528)*(0.032/0.032) =		0.632 lb/day
	CALLOW (As) = 0.632/(8.34*0.032) =			2.37 mg/L

PAI (Cr) = (6.38-0.00548)*(0.032/0.032) =		6.374 lb/day
	CALLOW (Cr) = 6.374/(8.34*0.032) =			23.88 mg/L

PAI (Cu) = (0.277-0.159)*(0.032/0.032) =		0.118 lb/day
	CALLOW (Cu) = 0.118 /(8.34*0.032) =			0.442 mg/L

PAI (Ni) = (5.16-0.00848)*(0.032/0.032) =		5.152 lb/day
	CALLOW (Ni) = 5.152/(8.34*0.032) =			19.30 mg/L

PAI (Zn) = (3.433-0.39)*(0.032/0.032) =		3.043 lb/day
	CALLOW (Zn) = 3.043/(8.34*0.032) =			11.4 mg/L

	PAI (Al) = (3.22-0.638)*(0.032/0.032) =		2.582 lb/day
	CALLOW (Al) = 2.582/(8.34*0.032) =			9.674 mg/L

I.	
VIII.	PROPOSED PERMIT LIMITATIONS

Parameter	Allowable Concentration (ALL)	Categorical Limits (CAT)	Current Permit
Limits (CPL)	Proposed Permit 
Limits (PPL)	Basis	
	Avg. (mg/L)	Max. (mg/L)	Avg. (mg/L)	Max. (mg/L)	Avg. (mg/L)	Max. (mg/L)	Avg. (mg/L)	Max. (mg/L)		
Arsenic, TR	2.37	2.37	-----	-----	-----	-----	-----	-----	TJ	
Chromium, TR	5.79	23.88	-----	-----	-----	-----	-----	-----	TJ	
Copper, TR	0.146	0.442	-----	-----	-----	-----	0.025	0.0375	TJ	
Nickel, TR	2.124	19.30	-----	-----	-----	-----	-----	-----	TJ	
Zinc, TR	11.4	11.4	-----	-----	-----	-----	-----	-----	TJ	
Aluminum, TR	4.35	9.674	-----	-----	-----	-----	-----	-----	TJ	
Iron, TR	24.62	----	-----	-----	-----	-----	-----	-----	TJ	
TSS	-----	-----	-----	-----	-----	-----	Report	Report	TJ	
Flow	-----	-----	-----	-----	-----	-----	Report	0.032 MGD	TJ	
pH	-----	-----	-----	-----	-----	-----	6.0 SU (min)	8.5 SU	City	
Temperature	-----	-----	-----	-----	-----	-----	Report	120 deg F	City	
BOD5	-----	-----	-----	-----	-----	-----	Report	Report	TJ	
TR = Total Recoverable; 
PPL is the smallest of ALL, CAT, and CPL, average and maximum, respectively 
TJ = Technical Judgement
City = City of Waynesboro Sewer Use Ordinance

The City of Waynesboro is currently having issues complying with the Copper limits found in their NDPES Permit.  As a result, the Copper limits for Hood are being set at the background concentrations levels reported in the City’s NPDES permit application from 2022.  Flow shall be measured daily with a Totalizer.  Total Recoverable Copper, BOD, and pH shall be monitored twice per month with a grab sample of the effluent.  Temperature shall be monitored twice per month instantaneously.  A letter has been received by the City of Waynesboro indicating they are willing to accept the discharge.

Three special conditions of the permit shall be as follows:

1.)	Within fifteen days after the commencement of discharge, the permittee shall notify MDEQ.
2.)	Within 180 days after the commencement of discharge, the permittee shall submit a complete Form 2P Application 
to MDEQ. Based upon the results of the data contained within the application, the permit may be reopened and modified to reflect the data.
3.)	  A copy of each Monthly Discharge Monitoring Report shall be submitted to the City of Waynesboro.

This permitting activity will require Public Notice.  

APPENDIX A

REMOVAL EFFICIENCIES
APPENDIX A

WAYNESBORO POTW REMOVAL EFFICIENCIES     

[mg/L]	1/26/2022	1/31/2022	2/9/22	2/25/22	3/15/22	3/17/22	4/27/2022	4/29/22	5/13/22	5/27/22	6/6/2022	6/17/22	Removal Efficiency1	
As Inf.	0.000771	0.000714	0.000713	0.000747	0.000629	0.000796	0.00103	0.000777	0.00153	0.00106	0.000509	0.000656	32.3 %	
As Eff.	0.000527	0.000551	0.000536	0.00057	0.000483	0.000431	0.000631	0.00065	0.00059	0.000516	0.000576	0.00066		
Cr Inf.	0.00144	0.000769	0.000355	0.000579	0.000586	0.000754	0.00102	0.000634	0.00228	0.000785	0.000347	0.000761	65.1 %	
Cr Eff.	0.000094	0.000201	0.000834	0.000121	0.000225	0.000232	0.000881	0.000172	0.000109	0.000339	0.000211	0.000181		
Cu Inf.	0.0345	0.0251	0.0174	0.0211	0.0243	0.0161	0.0189	0.0215	0.0525	0.0194	0.0165	0.0320	67.5 %	
Cu Eff.	0.0067	0.00883	0.00608	0.00746	0.0071	0.0047	0.0074	0.0142	0.00848	0.00673	0.00894	0.0106		
Ni Inf.	0.00167	0.00112	0.00112	0.00126	0.00113	0.00109	0.00141	0.00107	0.00212	0.00102	0.00147	0.00148	35.1 %	
Ni Eff.	0.000626	0.000402	0.00113	0.000744	0.00085	0.000693	0.000991	0.001	0.000966	0.00051	0.00123	0.00121		
Zn Inf.	0.0411	0.0476	0.0262	0.0443	0.0349	0.0255	0.0307	0.257	0.118	0.0260	0.0245	0.0580	75.6 %	
Zn Eff.	0.0125	0.0219	0.0239	0.0143	0.0147	0.0106	0.0117	0.011	0.0163	0.00969	0.0152	0.0173		
Al Inf.	0.296	0.294	--	--	--	--	--	--	--	--	--	--	--
	
Al Eff.	--	0.0290	--	--	--	--	--	--	--	--	--	--		
Fe Inf.	1.73	1.89	--	--	--	--	--	--	--	--	--	--	--
	
Fe Eff.	--	0.129	--	--	--	--	--	--	--	--	--	--		

1 Removal Efficiency = [(<inf.> - <eff.>)/<inf.>]*100, where <inf.> is the average influent value and <eff.> is the average effluent value.  

ADEQUACY OF TREATMENT

Date:			April 15, 2026                  
Permit Writer:				Rajeev Gupta
Facility:				Hood Industries, Waynesboro 
		Pretreatment Permit No. MSP092487   
		Wayne County  
Address:			915 Industrial Park Road 
		Waynesboro, MS  39367           

Proposed Hydraulic Loading:	0.032 MGD (Daily Max)
Proposed Organic Loading:	1130 mg/L  
0.032 MGD*8.34*1130 mg/L = 302 lb/day 

Waynesboro POTW, NPDES Permit No. MS0024228, AI No. 13446 
Permitted Flow:	2.25 MGD (Monthly Avg.)
12 Months Flow:	0.765 Avg. Daily Value (Based on 2025 Calendar Year)
12 Months BOD5: 	300 mg/L representative influent value 
Design BOD5:		2.25 MGD*8.34*300 mg/L = 5,630 lb/day  
Average BOD5:	0.765 MGD*8.34*300 mg/L = 1,914 lb/day

Evaluation of Flow
2.25 MGD permitted – 0.765 MGD actual = 1.485 MGD 
1.485 MGD available vs. 0.032 MGD proposed

Evaluation of BOD5
5,630 lb/day Design – 1,914 lb/day Average= 3,716 lb/day
3,716 lb/day available vs. 302 lb/day proposed

302 lbs/day is based on maximum flow from the facility for untreated condensate.  Hood Industries is planning to install a treatment system for the treatment of kiln condensate for Total Recoverable Copper.