NC0003719_Permit (Modification)_20000605

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
June 5, 2000
Mr. Manhar N. Patel
Monsanto Company
Post Office Box 2307
Cedar Creek Road
Fayetteville. North Carolina 28302
rA
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: NPDES Permit Modification
Permit Number NC0003719
Fayetteville Facility
Cumberland County
Dear Mr. Patel:
The Division issued NPDES permit number NC0003719 to Monsanto on December 29. 1995. The
Division has reviewed your request for permit modification at the subject facility. Specifically. you requested
that the effluent limitation for total zinc be removed. In accordance with your permit modification request and
applicable federal guidelines, the Division is Forwarding herewith a modification to the subject permit. This
permit modification removes the effluent limitation for zinc from Part 1. number 7.
Enclosed please find the amended page 3 of Part 1. number 7. The old page should be discarded.
This permit modification is issued pursuant to the requirements of North Carolina General Statute 143-215.1
and the Memorandum of Agreement between North Carolina and the U. S. Environmental Protection Agency
dated December 6. 1983.
Please take notice that this permit is not transferable. Part II. E.4. addresses the requirements to be
followed in case of change in ownership or control of this discharge. This permit does not affect the legal
requirement to obtain other permits which may be required by the Division of Water Quality or permits
required by the Division of Land Resources. Coastal Area Management Act or any other Federal or Local
government permit that may be required.
If you have any questions concerning this permit. please contact Mr. Mark McIntire at telephone
number [phone], extension 553.
Enclosure: Effluent page
Sincerely
‘jet,er( T. Stevens
Cc: Central Files (letter and effluent page)
NPDES Permit File (letter and effluent page)
Fayetteville Regional Office (letter and effluent page)
Point Source Compliance/Enforcement Unit (letter and effluent page)
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 - TELEPHONE [phone]/FAX [phone]
AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/ 10% POST -CONSUMER PAPER

Part I
NC000371 9
7. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - CONTINUED
EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
Monthly Avg. Daily Max. Measurement Sample Sample
(lb/day) (lb/day) Frequency Type Locations
Bromomethane 1.04 2.77 Quarterly Grab E
Dibromochloromethane 1.43 5.79 Quarterly Grab E
Tribromomethane 1.43 5.79 Quarterly Grab E
Total Chromium 2.45 6.12 Quarterly Composite E
Total Copper 3.20 7.47 Quarterly Composite E
Total Cyanide 2.53 7.32 Quarterly Grab E
Total Lead 3.04 6.56 Quarterly Composite E
Total Nickel 3.74 8.80 Quarterly Composite E
EFFLUENT CHARACTERISTICS DISCHARGE LIMITATIONS MONITORING REQUIREMENTS
Monthly Avg. Daily Max. Measurement Sample Sample
(µg/L) (µg/L) Frequency Type Locations
Total PAHs2 69.7 Quarterly Composite E
Hexachlorobenzene 1.73 Quarterly Composite E
NOTES:
1 Sample Locations: E — Effluent
2 Total PAHs are comprised of Benzo(a)anthracene: Benzo(a)pyrene: 3.4-Benzofluoranthene: Benzo(k)fluoranthene: Chrysene: Dibenz(a.h)anthracene; and Indeno(l .2.3-ed)pyrene.
Note: Composite samples must be refrigerated.

Feb-18-00 10:12A Monsanto
910+435 3390 P.01
Monsanto Corn an
P.O. Box 2307, Fayetteville, NC 28302
To: Susan Wilson
[phone]
Date: 2/18/00
Number of pages including cover sheet:
3
From: Manhar Patel
Phone:
910-433-4205
Fax phone:
910-435-3390
REMARKS: ❑ Urgent 0 For your review 0 Reply ASAP 0 Please comment
NOTE:
Please see attached letter to you and a copy of the letter from PWC per our conversations.
MONSANTO
Food •Health •Hope'

Feb-18-00 10:12A Monsanto
s
910+435 3390
P_02
MONSANTO
Food • Health • Hope
February 18, 2000
Mr. Dave Goodrich
Division of Water Quality
Permitting Department
1617 Mail Service Center
Raleigh, NC 27699-1617
Attention: Ms. Susan Wilson
Ref: NPDES #NC00003719
Dear Ms. Wilson:
Mek MAr•11;1CcAirAtV
tu,kr UI111ke.i SI 'OF
P.O. Box 2307
CEDAR CREEK ROAD
FAYeTrEVILLE, NORTH CAROUNA 28302
PHONE (9 LO) 323.3 300
Per our discussion, this morning the attached fax is being sent to you in support
of our ongoing communications concerning Zinc levels.
The attached letter from PWC of Fayetteville verifies the Zinc source and the
rationale for the elevated Zinc levels in the incoming PWC water supply source
utilized by Monsanto Company.
Once again, your assistance in modifying our permit to allow for the
"background" contribution in Zinc levels from supplied water is requested
urgently.
We continue to appreciate your cooperation in this matter. Thank you.
Manhar N. Patel
ESH Business Unit Manager
srns
Attachment
cc: Randy White - St. Louis
Hope Walters - Fayetteville

Feb-18-00 10:13A Monsanto
FE8-16 00 14:31 R0M:CROSS CREEK
910+435 3390
9104841228 TO:4334240
P.03
PAGE:02
11OREa1 C. W W.S.15. COMMIi.S C . :
MILTCN R. W3F'CRD, CCwM:SSIQNER
aoRERrw. IALT:b I C04,w15SicN:a
\AkCi 1 %En;. O)Nw155I7N0.
514veN K. iii.s0C.RARO, G_NCtA; MANAGCO
Mr. Manhar Patel
:Monsanto Company
PO Box 2307
Fayetteville, NC 28302
Dear Mr. Patel,
1✓UBLIC WORKS COMMISSION
or r E CITY OF FAYrT[vILLE
ELECTRIC & WATER UT1L1T1ES
Environmental Department
February 16, 2000
Sea TO.SOK ST{[C'
R.O. bOX 1089
rAVeTTt,IJ,E NORTH URC\1NA 2ea02.1 D 9
Tat,1%1NE (ARCA COI 910) 463-160'
FAS (AAA CCU 9101 48a.1429
I am writing in response to your inquiry concerning the concentration of zinc in the
potable water supply. As we discussed on the telephone, PWC uses zinc orthophosphate
as an additive to our fnished water to inhibit corrosion of pipes and plumbing fixtures
throughout the system. The addition of zinc orthophosphate was initiated as a result of
the EPA Lead and Copper Ruie, which mandates all water purveyors must implement
measures to prevent corrosion in the distribution system and in customers internal
plumbing to prevent the leaching of lead! and copper into the potable water supply.
The concentration of zinc in the PWC potable water system ranges from 0.15 mg/! to 0,5
mg1, depending on the sample location and time of year. PWC's potable water is in full
compliance with all State and Federal drinking water criterion, including those for lead
and copper. There is currently no State of Federal limit for zinc.
Fell free to contact me at 910-223-4702 if you have any questions or if 1 can be of further
assistance in this matter.
Sincerely,
Charles W. Ham
WfR Environmental Programs Manager
Pc: Mick Noland
Kevin Christmas
Berney Kidd
Monica Hayes
tmr*zZMF••271,7 gt
• AN EQUAL EMPl.OYr1ENT OPPORTUNITY , AMI-KMA''IvE ACTION EMPLOYER •

REGULATORY AND PERMITTING BACKGROUND
Applicable Effluent Guidelines
The purpose of this section is to detail the basis of Monsanto's current NPDES permit. It begins with a
discussion of the regulations applicable to the facility.
Regulatory Applicability
The Monsanto Fayetteville facility produces herbicide products. It is subject to the NPDES regulations
under Chapter 143 Sections 214 and 215 of the General Statutes for the protection of water resources.
Wastewater discharges from the facility are regulated under multiple effluent guidelines and standards.
These effluent guidelines and standards, along with the corresponding manufacturing facilities, are as
follows:
Pesticide Chemicals at 40 CFR 455, Subpart A, Organic Pesticide Chemicals Manufacturing Subcategory
- Glyphosate Conventional Tech and Dry Ammonium Glyphosate.
Pesticide Chemicals at 40 CFR 455, Subpart C - Pesticide Chemicals Formulating and Packaging -
Formulations;
Organic Chemicals, Plastics, and Synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory C - Other
Fibers - Wellman
Organic Chemicals, Plastics, and Synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory D -
Thermoplastic Resins - DuPont
Outlined on page 23 is a letter from Jeanette Powell (Water Quality Section) dated April 10, 1995 that
defined the methods and procedures pertaining to the facility's current permit limits.
There have been some significant changes to the facility during the current permit term to allow for
increased production.
• Expansion of Glyphosate Technical
• Addition of Dry Ammonium Glyphosate Facility
• Expansion of Dry Ammonium Glyphosate Facility to include a second reactor
Also, other changes have been made to utilities and other systems at the facility as follows:
• Addition of two Equalization Tanks
• Conversion of Equalization Basin to an aeration basin
• Addition of aerobic digester
• Upgrade of boilers #300 & #301 to dual firing with ultra low Nox burners
• Addition of 3nd leased boiler with ultra low Nox burner, burning natural gas only
• Complete phase -in of PWC water through entire facility
• Expiration of Pump and Haul Permit for transfer of wastewater off site
• Removal of air compressors from site - services are contracted through 3`d party supplier
• Anhydrous ammonia tank addition to waste treatment
• Dissolved oxygen system added to aeration basin 1
Requested changes to the permit have been outlined on pages 53-54.
20

CURRENT PERMIT METHODOLOGY
The following is proposed as a means of accommodated planned production increases for both Monsanto
and DuPont without the need to re -open the permit as each change occurs. Planned changes would be
implemented in a phased limit approach. Phase I is proposed as the current limitations. During the term
limit of Phase I it is anticipated that process improvements will contribute to incremental production
increases. However, Monsanto will be able to operate within the constraints of the Phase I permit limits.
Phase II will accommodate the following production change scenarios. These scenarios will allow permit
limit changes to accommodate either Monsanto only, DuPont only, or both companies as implementation
of planned production increases. The Phase II limits are divided into three phases. Phase II A -
Monsanto technical increases production to 96MM lbs. Phase II B - DuPont increases production and
Phase II C - both Monsanto technical and DuPont increase production.
The methods and procedures used to determine the current NPDES permit limits for the Fayetteville
Plant were outlined and discussed in detail in a letter, dated 4/10/95, issued by the Water Quality Section
of NC State's Division of Environmental Management. The letter is presented under the tab "Current
Waste Load Allocation". The production rates and wastewater flow rates used in the calculations of
current discharge limitations are tabulated as follows:
A). ANNUAL PRODUCTION DATA:
Year
Monsanto
DuPont
Wellman
1995-
74 MM lbs
258 MM lbs
143 MM lbs
2000
. ANNUAL WASTEWATER FLOW DATA
Year
Monsanto
DuPont
Wellman
Sanitary
1995-
0.875 MGD
0.260 MGD
0.005 MGD
0.1 MGD
2000
PERMIT METHODOLOGY FOR PHASE I DISCHARGE LIMITATIONS
Phase I is proposed as the current limitations. These limitations will become effective when the renewed
NPDES permit is issued until Phase II becomes effective. Phase II will commence immediately following
the plant modification to the Monsanto Tech Unit and/or the production achieved byDuPont's Unit. Both
projects are anticipated to be completed in 2002 and 2003.
The anticipated wastewater discharges in Phase I will not exceed the limitations established in the current
permit; therefore, Monsanto proposes no changes to the current discharge limitations except the metal
and cyanides limitations for Outfall 002. Monsanto requests these metal and cyanides limitations be
removed from the current and Phase I permits.
As described in a letter addressed to Mr. Paul Rawls on February 9, 2000, the metal and cyanides
standards listed in the BAT effluent guidelines only apply to the metal or cyanides bearing wastewater
streams. There are no such wastewater streams generated from Monsanto's, DuPont's, or Wellman's
production units.
PERMIT METHODOLOGY FOR PHASE II DISCHARGE LIMITATIONS
The Phase II discharge limitations consist of three scenarios: Phase II -A, Phase II-B, and Phase II-C.
Phase II -A
39

The Phase II -A discharge limitations will become effective when Monsanto Tech Unit increases its
glyphosate production by implementing its Phase II expansion project but DuPont does not implement its
project to increase its continuous process line's production.
The production rates and wastewater flow rates used for calculations of Phase II -A discharge limitations
are tabulated as follows:
(A). ANNUAL PRODUCTION DATA:
2002- 96 MM lbs
2003
Year Monsanto
(B). ANNUAL WASTEWATER FLOW DATA
2003
1. BOD5 Limits
Year Monsanto
2002- 0.925 MGD 0.260 MG
DuPont
A. The following EPA's effluent guidelines for BOD5 are applicable to Monsanto, DuPont, and
Wellman operations:
• Pesticide Chemicals at 40 CFR 455, Supart A, Organic Pesticide Chemicals Manufacturing
Subcategory - Glyphosate Conventional Tech and Dry Glyphosate Unit
1. Monthly Average:1.6 lbs/day for 1,000 lbs/day of PAI production
2. Daily Maximum: 7.4 lbs/day for 1,000 lbs/day of PAI production
• Organic Chemicals, Plastics, and synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory C- Other
Fibers - Wellman
1. Monthly Average: 18 mg/L
2. Daily Maximum: 48 mg/1
• Organic Chemicals, Plastics, and synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory D-
Thermoplastic Resins -DuPont
1. Monthly Average: 24 mg/L
2. Daily Maximum: 64 mg/L
• Secondary Treatment at 40 CFR 133, Subcategory D
1. Monthly Average: 30 mg/L
2. Daily Maximum: 45 mg/L
Monthly Average BOD5 Allocation= 1.6 lbs/day x 260 klbs/day + 18 mg/L x 0.005 x 8.34+ 24 mg/L
x 0.260 x 8.34 + 30 mg/L x 0.1 x 8.34 = 416 +1 +52+ 25 = 494 lbs/day
The BOD5 limits in the current permit were determined using a combination of Best Professional
Judgement (BPJ) limits for the Monsanto waste streams and the OCPSF effluent guidelines for the
Wellman and DuPont waste streams. The BOD5 loading from domestic waste were considered
negligible for purposes of waste load allocation.
Following the methodology used for the current permit, the BOD5 limits are calculated as follows.
40

fot
Monsanto Tech stream
BODS Loading in 1999 = COD Loading in 1999 x BOD5/COD Ratio*
= COD (lbs) x 0.471
= 13,439,280 x 0.471
= 6,329,000 lbs/yr or 17,432 lbs/day
(* BOD5/COD Ratio was based on the analyses performed in April 2000)
BOD5 loading after expansion = BODS Loading in 1999 x (Proposed Production/ 1999
Production) = 17,432 lbs/day x (96 MM lbs/60 MM lbs) = 27,891 lbs/day
BOD5 Removal Efficiency = 99%
GODS Allocation for Monsanto Streams After Expansion = Monsanto BOD5 Loading After
Expansion x (1-0.99) = 27,891 x (1-0.99) = 279 lbs/day
Wellman Stream
OCPSF: 40 CFR 414, Subcategory C- Other Fibers
Monthly Average: 18 mg/L
Wellman Wastewater Flow = 0.005 MGD
Wellman Monthly Average Allocation = 0.005 x 8.34 x 18 = 0.75 lbs/day
DuPont Stream
OCPSF: 40 CFR 414, Subcategory D- Thermoplastic Resins
Monthly Average: 24 mg/L
Wastewater Flow After Expansion = 0.260 MGD
Monthly Average Allocation = 0.260 x 8.34 x 24 = 52 lbs/day
Total BODS Monthly Average Allocation = 279+ 0.75 + 52 = 332 lbs/day
The BPJ method yields a lower BODS monthly average allocation; therefore, Monsanto proposes 330
lbs/day as the BOD5 monthly average limit.
B. Daily Maximum
Using the effluent guidelines, the daily maximum BODS allocation is calculated as follows:
Daily Maximum BODS Allocation = 7.4 lbs/day x 260 klbs/day + 48 mg/L x 0.005 x 8.34+ 64 mg/L x
0.260 x 8.34 + 45 mg/L x 0.1 x 8.34 = 1924 + 2+ 138 + 38 = 2,100 lbs/day
Following the methodology used for the current permit, the BODS limits are calculated as follows.
Daily Maximum = Monthly Average x 2.3** = 332 lbs/day x 2.3 = 763 lbs/day
(** 2.3 was the multiplier used to develop the daily maximum limit from the monthly average limit in the
current permit. The number was the highest daily maximum to monthly average ratio recorded in the
Fayetteville Plant's DMR's during the period from April 1993 through May 1994. 2.3 is more
conservative than the multipliers (4.625 for pesticide production and 2.6 for OCPSF) used in EPA's
effluent guidelines and the ratio of 3.72 recorded in Fayetteville Plant's 1999 DMR's.)
The methodology used for the current permit yields a lower allocation; therefore, Monsanto proposes 760
lbs/day as the BOD5 daily maximum limit.
41

4
MONSANTO FAYETTEVILLE PLANT
APPLICABLE BAT EFFLUENT STANDARDS
FOR OCPSF AND PESTICIDE PRODUCTIONS
PARAMETER
OCPSF
Pesticide
Daily Max.
(m9ll)
Monthly Avg.
(m0)
Daily Max.
(mgll)
Monthly Avg.
(mgn)
Acenaphthene
0.059
0.022
NA
NA
Acrylonitrile
0.242
0.096
NA
NA
Benzene
0.136
0.037
0.136
0.037
Carbon Tetrachloride
0.038
0.018
0.038
0.018
Chlorobenzene
0.028
0.015
0.028
0.015
1,2,4-Trichlorobenzene
0.140
0.068
NA
NA
Hexachlorobenzene
0.028
0.015
NA
NA
1,2-Dlchloroethane
0.211
0.068
0.211
0.068
1,1,1-Trichloroethane
0.054
0.021
0.054
0.021
Hexachtoroethane
0.054
0.021
NA
NA
1,1-Dlchtoroethane
0.059
0.022
NA
NA
1,1,2-Trichloroethane
0.054
0.021
NA
NA
Chloroethane
0.268
0.104
NA
NA
Chloroform (Trichloromethane)
0.046
0.021
0.046
0.021
2-Chlorophenol
0.098
0.031
0.098
0.031
1,2-Dichlorobenzene
0.163
0.077
0.163
0.077
1,3-Dichlorobenzene
0.044
0.031
NA
NA
1,4-Dichlorobenzene
0.028
0.015
0.028
0.015
1,1-Dichloroethylene
0.025
0.016
0.025
0.016
1,2-trans-Dichloroethylene
0.054
0.021
0.054
0.021
2,4-Dichlorophenol
0.112
0.039
0.112
0.039
1,2-Dichloropropane
0.230
0.153
0.230
0.153
1,3-Dichloropropylene
0.044
0.029
0.044
0.029
2,4-Dimethylphenol
0.036
0.018
0.036
0.018
2,4-Dinitrotoluene
0.285
0.113
NA
NA
2,6-Dinitrotoluene
0.641
0.255
NA
NA
Ethylbenzene
0.108
0.032
0.108
0.032
Fluoranthene
0.068
0.025
NA
NA
Methylene Chloride (Dichloromethane)
0.089
0.040
0.089
0.040
Methyl Chloride (Chtoromethane)
0.190
0.086
0.190
0.086
Hexachlorobutadiene
0.049
0.020
NA
NA
Naphthalene
0.059
0.022
0.059
0.022
Nitrobenzene
0.068
0.027
NA
NA
2-Nitrophenol
0.069
0.041
NA
NA
4-Nitrophenol
0.124
0.072
NA
NA
2,4-Dinitrophenol
0.123
0.071
NA
NA
4,6-Dinitro-o-cresol
0.277
0.078
NA
NA
Phenol
0.026
0.015
0.026
0.015
Bis(2-ethylhexyl)phthalate
0.279
0.103
NA
NA
Di-n-butyl phthalate
0.057
0.027
NA
NA
Diethyl phthalate
0.203
0.081
NA
NA
Dimethyl phthalate
0.047
0.019
NA
NA
Benzo(a)anthracene
0.059
0.022
NA
NA
Benzo(a)pyrene
0.061
0.023
NA
NA
3,4-Benzofluoranthene
0.061
0.023
NA
NA
Benzo(k)fluoranthene
0.059
0.022
NA
NA
Chrysene
0.059
0.022
NA
NA
Acenaphthylene
0.059
0.022
NA
NA
Anthracene
0.059
0.022
NA
NA
Fluorene
0.059
0.022
NA
NA
Phenanthrene
0.059
0.022
NA
NA
Pyrene
0.067
0.025
NA
NA
Tetrachloroethylene
0.056
0.022
0.056
0.022
Toluene
0.080
0.026
0.080
0.026
Trichtoroethylene
0.054
0.021
NA
NA
Vinyl Chloride
0.268
0.104
NA
NA
21

MONSANTO FAYETTEVILLE PLANT
APPLICABLE BAT EFFLUENT STANDARDS
FOR OCPSF AND PESTICIDE PRODUCTIONS
rOCPSF
PARAMETER
Pesticide
Daily Max.
(mg/I)
Monthly Avg.
(mgn)
Daily Max.
(mgll)
Monthly Avg.
(mgn)
Total Chromium('-)
2.770
1.110
NA
NA
Total Copper(1
3.380
1.450
NA
NA
Total Cyanides .)
1.200
0.420
0.64
0.220
Total Lead('.)
0.690
0.320
0.69
0.320
Total Nickell'.)
3.980
1.690
NA
NA
Total Zincl'.)
2.610
1.050
NA
NA
Bromodichtoromethane
NA
NA
0.38
0.142
Bromomethane (Methyl Bromide)
NA
NA
0.38
0.142
Dibromochloromethane
NA
NA
0.794
0.196
Tribromomethane (Bromoform)
NA
NA
0.794
0.196
Notes:
(1')-Applicable to facilities which discharge the metal -bearing waste streams. Monsanto's, Dupont's, or Wellman's Units do not discharge
any metal -bearing waste streams from its OCPSF and Pesticide operatlons;however, wastewater metals contamination does occur
due to the corrosion of process equipment and piping, or comes from intake water.
(21-Applicable to facilities which discharge the cyanide -bearing waste streams. Monsanto's, Dupont, or Wellman Units do not discharge
any cyanide -bearing waste streams from its OCPSF and Pesticide operations.
22

2. COD Limits
There are no EPA's effluent guidelines for COD which are applicable to Monsanto, DuPont or Wellman
operations. The Organic Pesticide Chemicals Manufacturing Subcategory (Pesticide Chemicals at 40
CFR 455, Subcategory A) does have COD effluent guidelines, but glyphosate productions are exempt
from this guideline.
Following the methodology used for the current permit, the COD limits are calculated based on Best
Professional Judgement.
DuPont COD Loading in 1999 = 5,769 lbs/day
DuPont COD Loading After Expansion = 5,769 x 380 MM lbs/ 259 MM lbs
= 8,464 lbs/day
Wellman COD Loading in 1999 = 194 lbs/day
Monsanto COD Loading in 1999 = 36,820 lbs/day
Monsanto COD Loading After Expansion = 36,820 x 96 MM lbs/ 60 MMlbs =
58,912 lbs/day
Total COD Loading = 8,464 + 194 + 58,912 = 67,570 lbs/day
COD Removal Efficiency = 90%
Monthly Average COD Allocation = 67,570 x (1-0.1) = 6,757 lbs/day rounded
to 6,800 lbs/day
Daily Maximum COD Allocation = Monthly Average x 1.6*** = 6,757 lbs/day x 1.6
= 10,811 lbs/day rounded to 10,800 lbs/day
(*** 1.6 was the multiplier used to develop the daily maximum limit from the monthly average limit in
the current permit. The number was the highest daily maximum to monthly average ratio recorded in
Fayetteville Plant's DMR's during the period from April 1993 through May 1994.)
3. NH3-N Limits
There are no EPA's effluent guidelines for NH3-N which are applicable to Monsanto, DuPont or
Wellman operations.
Following the methodology used for the current permit, the NH3 limits are calculated based on Best
Professional Judgement.
Summer Limits:
Current NH3 Monthly Average Limit = 35 lbs/day
Current NH3 Daily Maximum Limit = 2 x Monthly Average = 70 lbs/day
Proposed NH3 Monthly Average Limit = Current Limits x Production Increase Ratio
= 35 lbs/day x 1.4**** = 50 lbs/day
(**** 1.4 = (96 MM lbs/74 MM lbs + 380 MM lbs/258 MM lbs)/2)
Propose NH3 Daily Maximum Limit = 2 x Proposed Monthly Average = 100 lbs/day
Winter Limits:
Current NH3 Winter Limit = 2 x Current NH3 Summer Limit
42

Proposed NH3 Monthly Average Limit = 2 x 50 = 100 lbs/day
Propose NH3 Daily Maximum Limit = 2 x 100 = 200 lbs/day
. 4. Toxic Pollutants Permit Limits
Monsanto Tech Unit is subject to the BAT standards listed in Pesticide Chemical Effluent Guidelines (40
CFR 455.20(d)) which establishes the toxic pollutant's daily maximum and monthly average
concentrations. DuPont's and Wellman's units are subject to the standards listed in the OCPSF Effluent
Guidelines (40 CFR 414.91(a)).
The wastewater flow rates after expansions are as follows:
OCPSF Units: = 0.260 MGD (DuPont) + 0.005 MGD (Wellman) = 0.265 MGD
Pesticide unit: = 0.925 MGD (Monsanto)
Sample Calculation:
Propose Benzene Permit Limits:
Benzene: 0.136 mg/L (OCPSF) x 0.265 MGD x 8.34 + 0.136 mg/L (Pesticide) x 0.925 MGD x 8.34 =
1.35 lbs/day (Daily Maximum)
Benzene: 0.037 mg/L (OCPSF) x 0.265 MGD x 8.34 + 0.037 mg/L (Pesticide) x 0.925 MGD x 8.34 =
0.37 lbs/day (Monthly Average)
The proposed BAT limits for Phase II are attached in tab "BAT Limits".
Toxic pollutant permit limits established through the effluent guidelines were more stringent than those
established through water quality criteria with two exceptions: hexachlorobenzene and PAH. (Total
PAH's are comprised of Benzo(a)anthracene; Benzo(a)pyrene; 3,4-Benzofluoranthene; Benzo(k)
fluoranthene, Chrysene, Dibenz (a,h) anthracene and Indeno (1,2,3-cd) pyrene.)
5. TSS Limits
The following EPA effluent guidelines for TSS are applicable to Monsanto, DuPont and Wellman
operations:
• Pesticide Chemicals at 40 CFR 455, Supart A, Organic Pesticide Chemicals Manufacturing
Subcategory - Glyphosate Conventional Tech and Dry Glyphosate Unit
1. Monthly Average:1.8 lbs/day for 1,000 lbs/day of PAI production
2. Daily Maximum: 6.1 lbs/day for 1,000 lbs/day of PAI production
• Organic Chemicals, Plastics, and synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory C- Other
Fibers - Wellman
1. Monthly Average: 36 mg/L
2. Daily Maximum: 115 mg/1
• Organic Chemicals, Plastics, and synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory D-
Thermoplastic Resins -DuPont
1. Monthly Average: 40 mg/L
2. Daily Maximum: 130 mg/L
• Secondary Treatment at 40 CFR 133, Subcategory D
1. Monthly Average: 30 mg/L
2. Daily Maximum: 45 mg/L
Monthly Average TSS Allocation = 1.8 lbs/day x 260 klbs/day + 36 mg/L x 0.005x 8.34+ 40 mg/L x
0.260 x 8.34+ 30 mg/L x 0.1 x 8.34 = 468 + 2 + 87 + 25 = 582 lbs/day
43

04,
Monsanto proposes the TSS monthly average limit to be increased from 475 lbs/day to 580 lbs/day to
accommodate the increased production from Monsanto's and DuPont's units.
Using the effluent guidelines, the daily maximum TSS allocation is calculated as follows:
Daily Maximum TSS Allocation = 6.1 lbs/day x 260 klbs/day + 115 mg/L x 0.005 x 8.34+ 130 mg/L
x 0.260 x 8.34 + 45 mg/L x 0.1 x 8.34 = 1,586 + 5 +282 + 38 = 1,911 lbs/day
Following the methodology used for the current permit, the TSS limits are calculated as follows.
Daily Maximum = Monthly Average x 2 = 582 lbs/day x 2 = 1,164 lbs/day
The methodology used for the current permit yields a lower allocation; therefore, Monsanto proposes
1,160 lbs/day as the TSS daily maximum limit.
Phase II-B
The Phase II-B discharge limitations will become effective when DuPont increases its continuous process
line's production but Monsanto does not implement its Phase II expansion project
The production rates and wastewater flow rates used for calculations of Phase II-B discharge limitations
are tabulated as follows:
A). ANNUAL PRODUCTION DATA:
Year
Monsanto
DuPont
Wellman
2002-
85 MM lbs
495 MM lbs
143 MM lbs
2003
,.•.b(B). ANNUAL WASTEWATER FLOW DATA
Year
Monsanto
DuPont
Wellman
Sanitary
2002-
0.875 MGD
0.295 MGD
0.005 MGD
0.1 MGD
2003
1. BOD5 Limits
A. The following EPA's effluent guidelines for BOD5 are applicable to Monsanto, DuPont, and
Wellman operations:
• Pesticide Chemicals at 40 CFR 455, Supart A, Organic Pesticide Chemicals Manufacturing
Subcategory - Glyphosate Conventional Tech and Dry Glyphosate Unit
1. Monthly Average:1.6 lbs/day for 1,000 lbs/day of PAI production
2. Daily Maximum: 7.4 lbs/day for 1,000 lbs/day of PAI production
• Organic Chemicals, Plastics, and synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory C- Other
Fibers - Wellman
1. Monthly Average: 18 mg/L
2. Daily Maximum: 48 mg/1
• Organic Chemicals, Plastics, and synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory D-
Thermaoplastic Resins -DuPont
1. Monthly Average: 24 mg/L
2. Daily Maximum: 64 mg/L
• Secondary Treatment at 40 CFR 133, Subcategory D
1. Monthly Average: 30 mg/L
44

•
2. Daily Maximum: 45 mg/L
Monthly Average BOD5Allocatation= 1.6 lbs/day x 233 klbs/day + 18 mg/L x 0.005 x 8.34+ 24
mg/L x 0.295 x 8.34 + 30 mg/L x 0.1 x 8.34 = 373 +1 +59+ 25 = 458 lbs/day
The BOD5 limits in the current permit were determined using a combination of Best Professional
Judgement (BPJ) limits for the Monsanto waste streams and the OCPSF effluent guidelines for the
Wellman and DuPont waste streams. The BOD5 loading from domestic waste were considered
negligible for purposes of waste load allocation.
Following the methodology used for the current permit, the BODS limits are calculated as follows.
Monsanto Tech stream
BODS Loading in 1999 = COD Loading in 1999 x BOD5/COD Ratio
= COD (lbs) x 0.471
= 13,439,280 x 0.471
= 6,329,900 lbs/yr or 17,432 lbs/day
BODS loading after expansion = BODS Loading in 1999 x (Proposed Production /
1999 Production) = 17,432 lbs/day x (85 MM lbs/60 MM lbs) = 24,695 lbs/day
BODS Removal Efficiency = 99%
BODS Allocation for Monsanto Streams After Expansion = Monsanto BODS Loading After
Expansion x (1-0.99) = 24,695 x (1-0.99) = 247 lbs/day
Wellman Stream
OCPSF: 40 CFR 414, Subcategory C- Other Fibers
Monthly Average: 18 mg/L
Wellman Wastewater Flow = 0.005 MGD
Wellman Monthly Average Allocation = 0.005 x 8.34 x 18 = 0.75 lbs/day
DuPont Stream
OCPSF: 40 CFR 414, Subcategory D- Thermoplastic Resins
Monthly Average: 24 mg/L
Wastewater Flow After Expansion = 0.295 MGD
Monthly Average Allocation = 0.295 x 8.34 x 24 = 59 lbs/day
Total BOD5 Monthly Average Allocation = 247 + 0.75 + 59 = 307 lbs/day
The BPJ method yields a lower BOD5 monthly average allocations; therefore, Monsanto proposes 300
lbs/day as the BODS monthly average limit.
B. Daily Maximum
Using the effluent guidelines, the daily maximum BODS allocation is calculated as follows:
Daily Maximum BOD5 Allocation = 7.4 lbs/day x 233 klbs/day+ 48 mg/L x 0.005 x 8.34+ 64 mg/L x
0.295 x 8.34 + 45 mg/L x 0.1x 8.34 = 1,724 + 2+ 157+38 = 1,921 lbs/day
Following the methodology used for the current permit, the BODS limits are calculated as follows.
Daily Maximum = Monthly Average x 2.3** = 307 lbs/day x 2.3 = 706 lbs/day
45

(** 2.3 was the multiplier used to develop the daily maximum limit from the monthly average limit in the
current permit. The number was the highest daily maximum to monthly average ratio recorded in the
Fayetteville Plant's DMR's during the period from April 1993 through May 1994. 2.3 is more
conservative than the multipliers (4.625 for pesticide production and 2.6 for OCPSF) used in EPA's
effluent guidelines and the ratio of 3.72 recorded in Fayetteville Plant's 1999 DMR's.)
The methodology used for the current permit yields a lower allocation; therefore, Monsanto proposes 700
lbs/day as the BOD5 daily maximum limit.
2. COD. Limits
There are no EPA's effluent guidelines for COD which are applicable to Monsanto, DuPont or Wellman
operations. The Organic Pesticide Chemicals Manufacturing Subcategory (Pesticide Chemicals at 40
CFR 455, Subcategory A) does have COD effluent guidelines, but glyphosate productions are exempt
from this guideline.
Following the methodology used for the current permit, the COD limits are calculated based on Best
Professional Judgement.
DuPont COD Loading in 1999 = 5,769 lbs/day
DuPont COD Loading After Expansion = 5,769 x 495 MM lbs/ 259 MM lbs
= 10,615 lbs/day
Wellman COD Loading in 1999 = 194 lbs/day
Monsanto COD Loading in 1999 = 36,820 lbs/day
Monsanto COD Loading After Expansion = 36,820 x 85 MM lbs/ 60 MMlbs =
52,161 lbs/day
Total COD Loading = 10,615 + 194 + 52,161 = 62,970 lbs/day
COD Removal Efficiency = 90%
Monthly Average COD Allocation = 62,970 x (1-0.1) = 6,297 lbs/day rounded
to 6,300 lbs/day
Daily Maximum COD Allocation = Monthly Average x 1.6*** = 6,300 lbs/day x 1.6
= 10,080 lbs/day rounded to 10,000 lbs/day
(*** 1.6 was the multiplier used to develop the daily maximum limit from the monthly average limit in
the current permit. The number was the highest daily maximum to monthly average ratio recorded in
Fayetteville Plant's DMR's during the period from April 1993 through May 1994.)
3. NH3-N Limits
There are no EPA's effluent guidelines for NH3-N which are applicable to Monsanto, DuPont or
Wellman operations.
Following the methodology used for the current permit, the NH3 limits are calculated based on Best
Professional Judgement.
Summer Limits:
Current NH3 Monthly Average Limit = 35 lbs/day
46

Current NH3 Daily Maximum Limit = 2 x Monthly Average = 70 lbs/day
Proposed NH3 Monthly Average Limit = Current Limits x Production Increase Ratio
= 35 lbs/day x 1.53**** = 53 lbs/day
(**** 1.53 = (85 MM lbs/74 MM lbs + 495 MM lbs/258 MM lbs)/2)
Propose NH3 Daily Maximum Limit = 2 x Propose Monthly Average = 106 lbs/day
Winter Limits:
Current NH3 Winter Limit = 2 x Current NH3 Summer Limit
Proposed NH3 Monthly Average Limit = 2 x 53 = 106 lbs/day
Propose NH3 Daily Maximum Limit = 2 x 106 = 212 lbs/day
4. Toxic Pollutants Permit Limits
Monsanto Tech Unit is subject to the BAT standards list in Pesticide Chemical Effluent Guidelines (40
CFR 455.20(d)) which establishes the toxic pollutant's daily maximum and monthly average
concentrations. DuPont's and Wellman's units are subject to the standards listed in the OCPSF Effluent
Guidelines (40 CFR 414.91(a)).
The wastewater flow rates after expansions are as follows:
OCPSF Units: = 0.295 MGD (DuPont) + 0.005 MGD (Wellman) = 0.300 MGD
Pesticide unit: = 0.875 MGD (Monsanto)
Sample Calculation:
Propose Benzene Permit Limits:
Benzene: 0.136 mg/L (OCPSF) x 0.300 MGD x 8.34 + 0.136 mg/L (Pesticide) x 0.875 MGD x 8.34 =
1.33 lbs/day (Daily Maximum)
Benzene: 0.037 mg/L (OCPSF) x 0.300 MGD x 8.34 + 0.037 mg/L (Pesticide) x 0.875 MGD x 8.34 =
0.33 lbs/day (Monthly Average)
The proposed BAT limits for Phase II are attached in tab "BAT Limits".
Toxic pollutant permit limits established through the effluent guidelines were more stringent than those
established through water quality criteria with two exceptions: hexachlorobenzene and PAH. (Total
PAH's are comprised of Benzo(a)anthracene; Benzo(a)pyrene; 3,4-Benzofluoranthene; Benzo(k)
fluoranthene, Chrysene, Dibenz (a,h) anthracene and Indeno (1,2,3-cd) pyrene.)
5. TSS Limits
The following EPA's effluent guidelines for TSS are applicable to Monsanto, DuPont and Wellman
operations:
• Pesticide Chemicals at 40 CFR 455, Supart A, Organic Pesticide Chemicals Manufacturing
Subcategory - Glyphosate Conventional Tech and Dry Glyphosate Unit
1. Monthly Average:1.8 lbs/day for 1,000 lbs/day of PAI production
2. Daily Maximum: 6.1 lbs/day for 1,000 lbs/day of PAI production
• Organic Chemicals, Plastics, and synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory C- Other
Fibers - Wellman
1. Monthly Average: 36 mg/L
2. Daily Maximum: 115 mg/1
• Organic Chemicals, Plastics, and synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory D-
Thermaoplastic Resins -DuPont
47

1. Monthly Average: 40 mg/L
fillk 2. Daily Maximum: 130 mg/L
• Secondary Treatment at 40 CFR 133, Subcategory D
1. Monthly Average: 30 mg/L
2. Daily Maximum: 45 mg/L
Monthly Average TSS Allocation = 1.8 lbs/day x 233 klbs/day + 36 mg/L x 0.005x 8.34+ 40 mg/L x
0.295 x 8.34+ 30 mg/L x 0.1 x 8.34 = 419 + 2 + 98 + 25 = 544 lbs/day
Monsanto proposes the TSS monthly average limit to be increased from 475 lbs/day to 540 lbs/day to
accommodate the increased production from DuPont's units.
Using the effluent guidelines, the daily maximum TSS allocation is calculated as follows:
Daily Maximum TSS Allocation = 6.1 lbs/day x 233 klbs/day + 115 mg/L x 0.005 x 8.34+ 130 mg/L
x 0.295 x 8.34 + 45 mg/L x 0.1 x 8.34 = 1,421 + 5 +319 + 38 = 1,740 lbs/day
Following the methodology used for the current permit, the TSS limits are calculated as follows.
Daily Maximum = Monthly Average x 2 = 544 lbs/day x 2 = 1,088 lbs/day
The methodology used for the current permit yields a lower allocation; therefore, Monsanto proposes
1,100 lbs/day as the TSS daily maximum limit.
Phase II-C
The Phase II-C discharge limitations will become effective when both Monsanto Tech Unit increases its
glyphosate production by modifying its process and DuPont increases its continuous process line's
production.
The production rates and wastewater flow rates used for calculations of Phase II-C discharge limitations
are tabulated as follows:
Al. ANNUAL PRODUCTION DATA:
Year
Monsanto
DuPont
Wellman
2002-
2003
96 MM lbs
495 MM lbs
143 MM lbs
(B). ANNUAL WASTEWATER FLOW DATA
Year
Monsanto
DuPont
Wellman
Sanitary
2002-
2003
0.925 MGD
0.295 MGD
0.005 MGD
0.1 MGD
1. BOD5 Limits
A. The following EPA's effluent guidelines for BOD5 are applicable to Monsanto, DuPont, and
Wellman operations:
• Pesticide Chemicals at 40 CFR 455, Supart A, Organic Pesticide Chemicals Manufacturing
Subcategory - Glyphosate Conventional Tech and Dry Glyphosate Unit
1. Monthly Average:1.6 lbs/day for 1,000 lbs/day of PAI production
2. Daily Maximum: 7.4 lbs/day for 1,000 lbs/day of PAI production
• Organic Chemicals, Plastics, and synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory C- Other
Fibers - Wellman
48

1. Monthly Average: 18 mg/L
2. Daily Maximum: 48 mg/1
• Organic Chemicals, Plastics, and synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory D-
Thermaoplastic Resins -DuPont
1. Monthly Average: 24 mg/L
2. Daily Maximum: 64 mg/L
• Secondary Treatment at 40 CFR 133, Subcategory D
1. Monthly Average: 30 mg/L
2. Daily Maximum: 45 mg/L
Monthly Average BOD5Allocatation= 1.6 lbs/day x 260 klbs/day + 18 mg/L x 0.005 x 8.34+ 24
mg/L x 0.295 x 8.34 + 30 mg/L x 0.1 x 8.34 = 416 + 1 +59 + 25 = 501 lbs/day
The BODS limits in the current permit were determined using a combination of Best Professional
Judgement (BPJ) limits for the Monsanto waste streams and the OCPSF effluent guidelines for the
Wellman and DuPont waste streams. The BOD5 loading from domestic waste were considered
negligible for purposes of waste load allocation.
Following the methodology used for the current permit, the BODS limits are calculated as follows.
Monsanto Tech stream
BODS Loading in 1999 = COD Loading in 1999 x BODS/COD Ratio*
= COD (lbs) x 0.471
= 13,439,280 x 0.471
= 6,329,900 lbs/yr or 17,342 lbs/day
BODS loading after expansion = BODS Loading in 1999 x (Proposed Production
1999 Production) = 17,342 lbs/day x (96 MM lbs/60 MM lbs) = 27,747 lbs/day
BODS Removal Efficiency = 99 %
BODS Allocation for Monsanto Streams After Expansion = Monsanto BODS Loading After
Expansion x (1-0.99) = 27,747 x (1-0.99) = 277 lbs/day
Wellman Stream
OCPSF: 40 CFR 414, Subcategory C- Other Fibers
Monthly Average: 18 mg/L
Wellman Wastewater Flow = 0.005 MGD
Wellman Monthly Average Allocation = 0.005 x 8.34 x 18 = 0.75 lbs/day
DuPont Stream
OCPSF: 40 CFR 414, Subcategory D- Thermoplastic Resins
Monthly Average: 24 mg/L
Wastewater Flow After Expansion = 0.295 MGD
Monthly Average Allocation = 0.295 x 8.34 x 24 = 59 lbs/day
Total BODS Monthly Average Allocation = 277 + 0.75 + 59 = 337 lbs/day
The BPJ method yields a lower BOD5 monthly average allocation; therefore, Monsanto proposes 337
lbs/day as the BODS monthly average limit.
49

B. Daily Maximum
Using the effluent guidelines, the daily maximum BODS allocation is calculated as follows:
Daily Maximum BOD5 Allocation = 7.4 lbs/day x 260 klbs/day+ 48 mg/L x 0.005 x 8.34+ 64 mg/L x
0.295 x 8.34 + 45 mg/L x 0.1x 8.34 = 1924 + 2+ 157 + 38 = 2121 lbs/day
Following the methodology used for the current permit, the BODS limits are calculated as follows.
Daily Maximum = Monthly Average x 2.3** = 337 lbs/day x 2.3 = 775 lbs/day
(** 2.3 was the multiplier used to develop the daily maximum limit from the monthly average limit in the
current permit. The number was the highest daily maximum to monthly average ratio recorded in
Fayetteville Plant's DMR's during the period from April 1993 through May 1994. 2.3 is more
conservative than the multipliers (4.625 for pesticide production and 2.6 for OCPSF) used in EPA's
effluent guidelines and the ratio of 3.72 recorded in Fayetteville Plant's 1999 DMR's.)
The methodology used for the current permit yields a lower allocation; therefore, Monsanto proposes 775
lbs/day as the BODS daily maximum limit.
2. COD Limits
There are no EPA's effluent guidelines for COD which are applicable to Monsanto, DuPont or Wellman
operations. The Organic Pesticide Chemicals Manufacturing Subcategory (Pesticide Chemicals at 40
CFR 455, Subcategory A) does have COD effluent guidelines, but glyphosate productions are exempt
from this guideline.
Following the methodology used for the current permit, the COD limits are calculated based on Best
Professional Judgement.
DuPont COD Loading in 1999 = 5,769 lbs/day
DuPont COD Loading After Expansion = 5,769 x 495 MM lbs/ 259 MM lbs
= 10,615 lbs/day
Wellman COD Loading in 1999 = 194 lbs/day
Monsanto COD Loading in 1999 = 36,820 lbs/day
Monsanto COD Loading After Expansion = 36,820 x 96 MM lbs/ 60 MMlbs =
58,912 lbs/day
Total COD Loading = 10,615 + 194 + 58,912 = 69,721 lbs/day
COD Removal Efficiency = 90%
Monthly Average COD Allocation = 69,721 x (1-0.1) = 6,972 lbs/day rounded
to 7,000 lbs/day
Daily Maximum COD Allocation = Monthly Average x 1.6*** = 7,000 lbs/day x 1.6
= 11,200 lbs/day rounded to 11,000 lbs/day
(*** 1.6 was the multiplier used to develop the daily maximum limit from the monthly average limit in
the current permit. The number was the highest daily maximum to monthly average ratio recorded in
Fayetteville Plant's DMR's during the period from April 1993 through May 1994.)
50

3. NH3-N Limits
There are no EPA's effluent guidelines for NH3-N which are applicable to Monsanto, DuPont or
Wellman operations.
Following the methodology used for the current permit, the NH3 limits are calculated based on Best
Professional Judgement.
Summer Limits:
Current NH3 Monthly Average Limit = 35 lbs/day
Current NH3 Daily Maximum Limit = 2 x Monthly Average = 70 lbs/day
Proposed NH3 Monthly Average Limit = Current Limits x Production Increase Ratio
= 35 lbs/day x 1.78**** = 62 lbs/day
(**** 1.78 = (96 MM lbs/74 MM lbs + 495 MM lbs/258 MM lbs)/2)
Propose NH3 Daily Maximum Limit = 2 x Propose Monthly Average = 124 lbs/day
Winter Limits:
Current NH3 Winter Limit = 2 x Current NH3 Summer Limit
Proposed NH3 Monthly Average Limit = 2 x 62 = 1241bs/day
Propose NH3 Daily Maximum Limit = 2 x 124= 248bs/day
4. Toxic Pollutants Permit Limits
Monsanto Tech Unit is subject to the BAT standards list in Pesticide Chemical Effluent Guidelines (40
CFR 455.20(d)) which establishes the toxic pollutant's daily maximum and monthly average
concentrations. DuPont's and Wellman's units are subject to the standards listed in the OCPSF Effluent
Guidelines (40 CFR 414.91(a)).
The wastewater flow rates after expansions are as follows:
OCPSF Units: = 0.295 MGD (DuPont) + 0.005 MGD (Wellman) = 0.300 MGD
Pesticide unit: = 0.925 MGD (Monsanto)
Sample Calculation:
Propose Benzene Permit Limits:
Benzene: 0.136 mg/L (OCPSF) x 0.300 MGD x 8.34 + 0.136 mg/L (Pesticide) x 0.925 MGD x 8.34 =
1.39 lbs/day (Daily Maximum)
Benzene: 0.037 mg/L (OCPSF) x 0.300 MGD x 8.34 + 0.037 mg/L (Pesticide) x 0.925 MGD x 8.34 =
0.38 lbs/day (Monthly Average)
The proposed BAT limits for Phase II are attached in tab "BAT Limits".
Toxic pollutant permit limits established through the effluent guidelines were more stringent than those
established through water quality criteria with two exceptions: hexachlorobenzene and PAH. (Total
PAH's are comprised of Benzo(a)anthracene; Benzo(a)pyrene; 3,4-Benzofluoranthene; Benzo(k)
fluoranthene, Chrysene, Dibenz (a,h) anthracene and Indeno (1,2,3-cd) pyrene.)
5. TSS Limits
The following EPA's effluent guidelines for TSS are applicable to Monsanto, DuPont and Wellman
operations:

• Pesticide Chemicals at 40 CFR 455, Supart A, Organic Pesticide Chemicals Manufacturing
Subcategory - Glyphosate Conventional Tech and Dry Glyphosate Unit
1. Monthly Average:1.8 lbs/day for 1,000 lbs/day of PAI production
2. Daily Maximum: 6.1 lbs/day for 1,000 lbs/day of PAI production
• Organic Chemicals, Plastics, and synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory C- Other
Fibers - Wellman
1. Monthly Average: 36 mg/L
2. Daily Maximum: 115 mg/1
• Organic Chemicals, Plastics, and synthetic Fibers (OCPSF) at 40 CFR 414, Subcategory D-
Thermoplastic Resins -DuPont
1. Monthly Average: 40 mg/L
2. Daily Maximum: 130 mg/L
• Secondary Treatment at 40 CFR 133, Subcategory D
1. Monthly Average: 30 mg/L
2. Daily Maximum: 45 mg/L
Monthly Average TSS Allocation = 1.8 lbs/day x 260 klbs/day + 36 mg/L x 0.005x 8.34+ 40 mg/L x
0.295 x 8.34+ 30 mg/L x 0.1 x 8.34 = 468 + 2 + 98 + 25 = 593 lbs/day
Monsanto proposes the TSS monthly average limit to be increased from 475 lbs/day to 600 lbs/day to
accommodate the increased production from Monsanto's and DuPont's units.
Using the effluent guidelines, the daily maximum TSS allocation is calculated as follows:
Daily Maximum TSS Allocation = 6.1 lbs/day x 260 klbslday + 115 mg/L x 0.005 x 8.34+ 130 mg/L
x 0.295 x 8.34 + 45 mg/L x 0.1 x 8.34 = 1,586 + 5 +319 + 38 = 1,948 lbs/day
Following the methodology used for the current permit, the TSS limits are calculated as follows.
Daily Maximum = Monthly Average x 2 = 600 lbs/day x 2 = 1,200 lbs/day
The methodology used for the current permit yields a lower allocation; therefore, Monsanto proposes
1,200 lbs/day as the TSS daily maximum limit.
52

001/4,
REQUESTED CHANGES IN THE PERMIT
The President's Regulatory Reinvention Initiative for the Environmental Protection Agency (EPA)
established an interim goal of reducing reporting and monitoring by at least 25 %. Based on these
directions, EPA's Offices of Water and Enforcement & Compliance Assurance developed an Interim
Guidance, published in April 1996, to reduce regulatory burdens associated with reporting and
monitoring based on a demonstration of excellent historical performance by facilities subject to NPDES
permit requirements.
For each eligible parameter, the two year composite average at each outfall is calculated and compared
with the permit limit and monitoring frequency to determine the potential monitoring frequency
reduction. The table presented in the Interim Guidance which shows the baseline monitoring frequency
and potential allowable reduced frequency is reproduced below.
Ratio of Long Term Effluent Avg. to Monthly Avg. Limit
Baseline
Monitoring
75-66%
65-50%
49-25%
< 25 %
Allowable Reduced Frequency
3/wk
3/wk
2/wk
1/wk
1 /wk
2/wk
2/wk
1/wk
2/mo
1/mo
1/wk
1/wk
1/wk
2/mo
1/2mos
The table below lists the Monsanto Fayetteville's permitted monthly average limits, 2-year long term
effluent average, the ratio of the long term effluent average to the permitted monthly average, the existing
permit monitoring frequency and the potential allowable reduced frequency under the Interim Guidance.
Monsanto requests the permitting authority to review our excellent compliance performance and grant a
reduction in monitoring frequency for the eligible parameters in the permit renewal.
Outfall/
Parameter
Permit
Monthly
Average
(lbs/day)
2-yr Long
Term Effluent
Average
(lbs/day)
Ratio of Long Term
Effluent Average to
Permit Monthly
Average
Existing Permit
Monitoring
Frequency
Allowable
Reduced
Frequency
002/
Ammonia
70/35
1.22
2 %/4 %
3/wk
l /wk
002/
COD
5000
1014
21%
3/wk
1/wk
002/
BOD
400/200
36
9%/18%
3/wk
1/wk
002/
TSS
457
67
15%
3/wk
1/wk
No limitations were imposed for residual chlorine, dissolved oxygen and temperature. Monsanto
requests those requirements be reduced to once per week on the renewed permit.
The Monsanto Fayetteville facility is requesting removal of permitted Outfall 003 from the new permit.
Outfall 003 is the effluent for the Incineration Scrubber Unit. This equipment has been mothballed and is
on the plant's list for future dismantling.
53

i\ive-Rodto, ko\)sk,i4
eon
The Monsanto Fayetteville facility is requesting the reportm requirements be reduced for acute toxicity
to annual after four consecutive passed tests as well as the OCPSF Scan from quarterly to annually
beginning with the renewed permit. '
Monsanto further requests the existing metals and cyanides limitations for Outfall 002 be removed from
the current and renewed permit. The metals and cyanides standards listed in the BAT effluent guidelines
only apply to the metal or cyanides bearing wastewater streams. There are no such wastewater streams
generated from Monsanto's, DuPont's or Wellman's production units.

•
tows
MONSANTO FAYETTEVILLE PLANT
PAST OPERATIONS AND REMEDIATION PROJECTS
Monsanto has owned the old "Rohm and Haas" landfill which was part of the total site purchased in
1978. This landfill has not been utilized by Monsanto. It is located in the south west corner of the plant
property. This landfill was federally listed as a "to be investigated site". In late 1989 the site was
investigated via several visits by EPA and NCDENR Superfund. It was assessed for any potential
subsurface leaching issues. Due to approximately 95 % of the materials disposed of being non -hazardous
polyester, nylon chips, strands, and or lumps in drums and a few associated chemicals in small
quantities, the site investigation did not result in immediate concern based on EPA's assessment.
Concerns did emerge as a result of fmding low levels of chloro-compounds in groundwater including
perchloroethenes which have led to additional and ongoing investigations in subsequent years.
In the early 1990's it was discovered that Wellman, Inc (facility adjacent to Monsanto) had a sump
related subsurface release of an unknown quantity of perchloroethylene which was detected in
Monsanto's groundwater wells that are adjacent to the property and downgradient to the hydrologic flow
profiles. This was confirmed by NCDENR and Wellman was instructed to excavate and remediate the
sump on their property. Monsanto continues to sample and report the monitoring wells quality data to
the NCDENR annually.
In 1996 Monsanto learned that ICIA, Inc (another adjoining facility now owned by DuPont) had a release
of heating fluid (Dowtherm®) to their groundwater via subsurface waste line failure. Subsequent
groundwater analysis on their site as well as Monsanto's annual sampling confirmed the presence of
Dowtherm associated compounds (di -phenyl ethers & oxides). Under NCDENR guidance, DuPont is
utilizing bio-sparge techniques to remediate groundwater on their site.
During the 1990's Monsanto experienced one liquid based caustic spill of approximately 2000 gallons.
This spill was reported under SARA and occurred in the waste treatment area. This spill was remediated
immediately via soil removal, excavation and off -site disposal which minimized the groundwater impact.

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MONSANTO
Food • Health • Hope
February 3, 2000
Mr. Dave Goodrich, Supervisor
Division of Water Quality
Permitting Department
1617 Mail Service Center
Raleigh, NC 27699-1617
Reference: NPDES Permit # NC 0003719
Subject:
Zinc Data: OCPSF Sampling
Dear Mr. Goodrich:
FEB I
DEhR - WATL
POINT SC.'
cAlltj
r0ttiv);fig-
•r
r,�,,; �.t Ppr,'«, 61e, .
MONSANTO COMPANY
AGRICULTURAL SECTOR
P.O. Box 2307
CEDAR CREEK ROAD
FAYETTEVILLE, NORTH CAROLINA 28302
PHONE [phone]
As a follow-up to our recent discussions, and as instructed, Monsanto Company's Fayetteville
Plant is submitting the required data on Zinc sources. As explained earlier, the attached data
history support Monsanto's claim that the elevated Zinc value during the August, 1999 OCPSF
analysis resulted from the PWC of Fayetteville water works supplied potable water as the
principal and background source of water used in it's process. The attached information
substantiates this claim as following conclusions are drawn from extensive data analysis:
A) Table 1 History: Outlines the fact that progressively Zinc loading increased as
Monsanto transitioned to exclusive use of the PWC supplied water (e.g.
Ibs/day Zinc loading increased from 2.15 Ibs to 3.39 Ibs - an increase of
58%)
B) Table 2 Recent History: December 1999: Supports the claim that the incoming
PWC water loading above at 3.55 Ibs/day was more than 2.5 times the
combined loading from the chemical waste sources (DuPont, Monsanto,
Wellman) of 1.37 Ibs/day.
C) Table 3 Recent History: January 2000: Additionally confirms the findings
outlined in B above.
D) Table 4 As a follow-up to your request, duplicate sampling and analysis by the
Burlington Research labs and the Savannah labs indicate some biases
which you appropriately predicted due to QA/QC factors, it is, however,
evident that directionally the loadings of Zinc favorably support claims
in the A to C reasoning above. Furthermore, both labs confirm that
other than Zinc, metals (Ni, Pb, Cu & Cr) remain well below the limits.
(See graphs on metals).
Furthermore, the 1998/1999 Zinc source profile attached within the Appendix clearly
estimates the extent of Zinc contributions to Monsanto's waste treatment where incoming
PWC water supply is the overriding contributor

Mr. Goodrich
II February 3, 2000
Based on these findings, Monsanto requests that consideration be given to the "background"
source (PWC water) in assessing any further actions, especially since the metal contents of
"chemical based" influents historically have, in total, always amounted to less than the
OCPSF mandated levels.
Additionally, Monsanto requests that a complete consideration be given in assessing any
negative actions against Monsanto.
Also, Monsanto's concerns are further heightened, especially in light of the supporting data,
that meeting the stipulated limits on Zinc may not be feasible for the duration of permit
(expiring December 31, 2000) due to such elevated levels in Zinc from the background PWC
water supply. It is, therefore, requested that permit conditions be modified.
In conjunction with the above rationale, we additionally offer our corporate review of the
OCPSF Regulations as they apply to our operations specifically to Zinc (See Attachment II).
This attachment references the subpart I "Direct discharge point sources that use end -of -pipe
biological treatment". Metals and cyanide only apply to that portion of the waste water that
comes from a waste stream specifically mentioned in Appendix A. I have included Zinc waste
streams from Appendix A. Note that PET (Polyethylene Terephthalates: Manufactured by
DuPont, Wellman) manufacture is NOT shown for Zinc and, therefore, should not be limited.
Again we should not have a Zinc limit based on the regulations. We, therefore, request your
concurrence and ask for a permit revision to acknowledge this. Also, our Louisiana facility,
which as you know, also manufactures glyphosate while treating other waste water, does
NOT have a Zinc limit for the very same reason.
We appreciate your patience and considerations in allowing us to submit a thorough
evaluation of the cause leading up to this situation. We are committed, as you are, in
safeguarding the integrity of the environment as we continue to operate while protecting the
water quality resources of North Carolina.
Sincerely,
Manhar N. Pa
Environmental Safety & Health
Business Unit Manager
sms
cc: Susan Wilson - Environmental Engineering
Permitting Section
Mr. Shannon Langley - Compliance Supervisor
Paul Rawls - Supervisor
Division Water Quality - Fayetteville, NC

• A) History: PWC Water Data: Zinc
Sample at Incoming Header
Table 1
1996*
1997
1998
1999
PWC Water Usage (M
Gallons/Year)
353
536
572
499
Average Zinc (Ibs/day)
2.15
3.08
3.45
3.11
* Switchover year from river water to PWC supply.
B) Recent Data: Individual Influent Data: Zinc (Period 12/1/99 to 12/20/99)
Lab = Burlington Research
Table 2
Averages
Flow MGD I Zinc Conc Mg/litre I Zinc Ibs/day
DuPont
.198
.582
.950
Wellman
.002
.232
.004
Monsanto
.619
.080
.413
Sub -Total: Chemical Stream
.819
- I 1.367
Other: Cooling Tower B/D
.394
.762
2.448
PWC Water
1.4
.304
3.549
C) Period: 1/1/2000 - 1/10/2000
Table 3
Flow MGD
Zinc Conc
(mg/litre)
Zinc lbs/day
DuPont
.164
.368
.502
Wellman
.003
.208
.005
Monsanto
.578
.253
1.216
Sub Total: Chemical Streams
.745
.758
1.723
Other: Cooling Tower B/D
.400
.758
1.99
PWC Water
1.29
.305
3.07

APPENDIX

PWC
Supplied
Water
Header
Flow =1.47MGD
Zinc = 3.44 Ibs/day
1998/1999: Zinc Profile
(Averages)
Cooling
Tower
Blowdown
IDuPont
1
Flow = .394 MGD
Zinc = 2.448 Ibs/day
Flow = .198 MGD
Zinc = .950 Ibs/day
I Wellman I
Flow = .002 MGD
Zinc = .004 Ibs/day
Other Misc.
'Monsanto'
Flow = .619 MGD
Zinc = .413 Ibs/day
• Softeners
• Sanitary
• Gen. Purpose
• Boilers
Monsanto's
Waste
Treatment
System
Est. Flow = .05 MGD
Est. Zinc = <.5 lbs/day
1
Outfall
Zinc
Daily Monthly
Max Avg.
Limits: 5.77 2.32

9.000
8.000
7.000
cn 6.000
Z 5.000
0 4.000
a 3.000
2.000
1.000
0.000
ZINC LBS/DAY
01/07/2000
0 0 0 0 0
0 0 0 0 0
N N (V N N
O N d' 1� O)
\ T T \
T T T T T
DATE
- DAILY INFLUENT ZINC LBS
- DAILY EFFLUENT ZINC LBS

INFLUENT/EFFLUENT - ZINC LBS/DAY
INFLUENT TO WASTE TREATMENT PLANT = PWC,DUPONT, WELLMAN, TECH PROCESS, COOLING TOWER
EFFLUENT = CLARIFER OVERFLOW
TOTAL
DATE SOURCE ZINC FLOW ZINC INFLUENT
(MGD) LBS/DAY ZINC
01/04/2000
PWC 0.32 1.290 3.443 5.565
DUPONT 0.18 0.018 0.027
WELLMAN 0.20 0.003 0.005
TECH PROCESS 0.05 0.649 0.249
COOLING TOWER 0.69 0.320 1.841
01/05/2000
CLARIFIER OVERFLOW 0.24 0.953 1.908
PWC 0.29 1.290 3.120 6.125
DUPONT 0.18 0.243 0.365
WELLMAN 0.28 0.002 0.005
TECH PROCESS 0.05 0.632 0.264
COOLING TOWER 0.66 0.431 2.372
01/07/2000
CLARIFIER OVERFLOW 0.25 0.850 1.772
PWC 0.26 1.290 2.797 5.866
DUPONT 0.42 0.239 0.837
WELLMAN 0.10 0.004 0.003
TECH PROCESS 0.06 0.645 0.323
COOLING TOWER 0.58 0.394 1.906
CLARIFIER OVERFLOW 0.26 0.978 2.121

INFLUENT/EFFLUENT - ZINC LBS/DAY
INFLUENT TO WASTE TREATMENT PLANT = PWC,DUPONT, WELLMAN, TECH PROCESS, COOLING TOWER
EFFLUENT = CLARIFER OVERFLOW
TOTAL
DATE SOURCE ZINC FLOW ZINC INFLUENT
(MGD) LBS/DAY ZINC
01/10/2000
PWC 0.21 1.290 2.259 7.254
DUPONT 0.35 0.260 0.759
WELLMAN 0.06 0.004 0.002
TECH PROCESS 0.61 0.651 3.312
COOLING TOWER 0.33 0.335 0.922
01/12/2000
CLARIFIER OVERFLOW 0.22 1.041 1.910
PWC 0.23 1.290 2.474 5.809
DUPONT 0.60 0.118 0.590
WELLMAN 0.10 0.004 0.003
TECH PROCESS 0.10 0.651 0.516
COOLING TOWER 0.58 0.460 2.225
01/14/2000
CLARIFIER OVERFLOW 0.29 0.957 2.315
PWC 0.29 1.290 3.120 6.352
DUPONT 0.30 0.248 0.620
WELLMAN 0.10 0.004 0.003
TECH PROCESS 0.07 0.633 0.359
COOLING TOWER 0.62 0.435 2.249
01/17/2000
CLARIFIER OVERFLOW 0.28 1.046 2.443
PWC 0.33 1.290 3.550 7.904
DUPONT 0.33 0.214 0.589
WELLMAN 0.11 0.002 0.002
TECH PROCESS 0.26 0.628 1.362
COOLING TOWER 0.63 0.457 2.401
CLARIFIER OVERFLOW 0.23 0.940 1.803

INFLUENT/EFFLUENT - ZINC LBS/DAY
INFLUENT TO WASTE TREATMENT PLANT = PWC,DUPONT, WELLMAN, TECH PROCESS, COOLING TOWER
EFFLUENT = CLARIFER OVERFLOW
TOTAL
DATE SOURCE ZINC FLOW ZINC INFLUENT
(MGD) LBS/DAY ZINC
01/19/2000
PWC 0.35 1.290 3.766
DUPONT 0.34 0.244 0.692
WELLMAN 0.11 0.003 0.003
TECH PROCESS 0.07 0.546 0.301
COOLING TOWER 0.64 0.368 1.964
CLARIFIER OVERFLOW 0.24
0.999 2.000
6.725

PWC INCOMING WATER
1999
MONTH MONTHLY PWC DAILY AVERAGE ZINC Incominq ZINC
(mgd) (MGD) (Ibs/day) (Ibs/month))
JANUARY 44 1.4 3.479 107.85
FEBUARY 40 1.4 3.561 99.71
MARCH 45 1.4 3.585 111.14
APRIL 42 1.4 3.759 112.77
MAY 38 1.2 3.002 93.06
JUNE 46 1.5 3.841 115.23
JULY 43 1.4 3.269 101.34
AUGUST 46 1.5 3.615 112.07
SEPTEMBER 42 1.4 3.258 97.74
OCTOBER 31 1.0 2.218 68.76
NOVEMBER 42 1.4 3.713 111.39
DECEMBER 40 1.3
YTD TOTALS 499 1,131.05
MONTHLY AVG. 42 3.11 94.25

INCOMING ZINC FROM PWC
1998
MONTH MONTHLY PWC DAILY AVERAGE ZINC INF. ZINC MONTHLY fibs)
(MGaI/Month) (mgd) (Ibs/day)
JANUARY 44 1.4 2.685 83.23
FEBUARY 40 1.3 2.597 72.73
MARCH 47 1.5 3.292 102.06
APRIL 50 1.6 3.542 106.27
MAY 46 1.5 3.849 119.31
JUNE 47 1.5 3.737 112.11
JULY 48 1.6 3.375 104.62
AUGUST 47 1.5 3.651 113.19
SEPTEMBER 48 1.5 3.508 105.24
OCTOBER 47 1.5 3.318 102.85
NOVEMBER 57 1.9 4.452 133.57
DECEMBER 50 1.6 3.909 121.19
YTD TOTALS 572 1,276.38
MONTHLY 48 3.49 106.37
AVG.

INCOMING ZINC FROM PWC
1997
MONTH MONTHLY PWC DAILY AVERAGE ZINC INF. ZINC MONTHLY (Ibs)
(MGaI/Month) (mgd) (Ibs/day)
JANUARY 46 1.5 3.803 117.90
FEBUARY 41 1.3 2.635 73.78
MARCH 46 1.5 3.040 94.23
APRIL 44 1.4 3.086 92.58
MAY 46 1.5 3.577 110.90
JUNE 48 1.5 3.446 103.39
JULY 49 1.6 3.827 118.63
AUGUST 42 1.4 2.779 86.14
SEPTEMBER 42 1.4 2.968 89.04
OCTOBER 41 1.3 2.404 74.51
NOVEMBER 38 1.2 2.308 69.24
DECEMBER 52 1.7 3.132 97.09
YTD TOTALS 536 1,127.43
MONTHLY 45 3.08 93.95
AVG.

INCOMING ZINC FROM PWC
1996
MONTH MONTHLY PWC DAILY AVERAGE ZINC INF. ZINC MONTHLY (Ibs)
(MGaI/Month) (mgd) (Ibs/day)
JANUARY 29.426 0.9 2.058 63.81
FEBUARY 29.426 0.9 2.296 64.28
MARCH 29.426 0.9 2.106 65.28
APRIL 29.426 0.9 2.272 68.16
MAY 29.426 0.9 2.383 73.87
JUNE 29.426 0.9 1.876 56.29
JULY 29.426 0.9 2.153 66.75
AUGUST 29.426 0.9 2.486 77.06
SEPTEMBER 29.426 0.9 1.813 54.39
OCTOBER 29.426 0.9 1.947 60.37
NOVEMBER 29.426 0.9 2.098 62.94
DECEMBER 29.426 0.9 2.351 72.89
YTD TOTALS 353 786.08
MONTHLY AVG. 29 2.15 66

Nov-96
Aug-96
May-96
Feb-96
Nov-97
Aug-97
May-97
Effluent Metals
Feb-97 Nov-98
Date
Aug-98
May-98
Feb-98
[--40—LEAD —CI— NICKEL (ZINC —*—CYANIDE —CIE—COPPER tCHROMIUM 1
Nov-99
Aug-99
May-99
Feb-99

Savannah Lab versus Burlington Lab Comparison
STL = SAVANNAH LABS
BR = BURLINGTON RESEARCH
STL BR STL BR STL BR STL BR STL BR
DATE SOURCE ZINC ZINC NICKEL NICKEL LEAD LEAD COPPER COPPER CHROMIUM CHROMIUM
01/04/2000 PWC 0.3100 0.3200 < 0.04 < 0.002 < 0.005 < 0.0002 0.0330 0.0250 < 0.010 0.0007
DUPONT 0.2100 0.1800 < 0.04 0.0060 < 0.005 0.0013 0.0410 0.0370 < 0.010 0.0066
WELLMAN 0.2400 0.2000 < 0.04 0.0090 0.0180 0.0120 0.2300 0.2000 < 0.010 0.0110
TECH PROCESS 0.0570 0.0460 < 0.04 0.0070 < 0.005 0.0005 < 0.020 < 0.002 0.0110 0.0110
CLARIFIER 0.2900 0.2400 < 0.04 0.0100 0.0062 0.0021 < 0.020 0.0060 < 0.010 0.0056
OVERFLOW
COOLING 0.7400 0.6900
TOWER
01/05/2000 PWC 0.3400 0.2900 < 0.04 0.0020 < 0.005 0.0004 0.0330 0.0280 < 0.010 0.0058
DUPONT 0.2300 0.1800 < 0.04 0.0060 < 0.005 0.0018 0.0350 0.0280 < 0.010 0.0110
WELLMAN 0.3700 0.2800 < 0.04 0.0130 0.0320 0.0180 0.3100 0.2700 < 0.010 0.0170
TECH PROCESS 0.0640 0.0500 < 0.04 0.0080 < 0.005 0.0003 < 0.020 < 0.002 0.0130 0.0120
CLARIFIER 0.3300 0.2500 < 0.04 0.0100 < 0.005 0.0029 < 0.020 0.0060 < 0.010 0.0110
OVERFLOW
COOLING 0.8400 0.6600
TOWER
01/07/2000 PWC 0.3100 0.2600 < 0.04 0.0030 < 0.005 0.0002 0.0280 0.0280 < 0.010 0.0048
DUPONT 0.5800 0.4200 < 0.04 0.0170 < 0.005 0.0014 0.0430 0.0340 0.0120 0.0170
WELLMAN 0.1400 0.1000 < 0.04 0.0060 0.0073 0.0055 0.1800 0.1400 < 0.010 0.0150
TECH PROCESS 0.0720 0.0600 < 0.04 0.0070 < 0.005 0.0006 < 0.020 0.0030 0.1000 0.0120
CLARIFIER 0.3500 0.2600 < 0.04 0.0100 < 0.005 0.0030 < 0.020 0.0050 0.0100 0.0088
OVERFLOW
COOLING 0.7700 0.5800
TOWER

DATE
01/10/2000
01/12/2000
01/14/2000
01/17/2000
SOURCE
PWC
DUPONT
WELLMAN
TECH PROCESS
CLARIFIER OVERFLOW
COOLING TOWER
PWC
DUPONT
WELLMAN
TECH PROCESS
CLARIFIER OVERFLOW
COOLING TOWER
PWC
DUPONT
WELLMAN
TECH PROCESS
CLARIFIER OVERFLOW
COOLING TOWER
PWC
DUPONT
WELLMAN
TECH PROCESS
CLARIFIER OVERFLOW
COOLING TOWER
Savannah Lab versus Burlington Lab Comparison
STL = SAVANNAH
BR = BURLINGT
LABS
ON RESEARCH
STL BR STL BR STL BR
ZINC ZINC NICKEL NICKEL LEAD LEAD
STL BR STL BR
COPPER COPPER CHROMIUM CHROMIUM
0.2600 0.2100 < 0.04 0.0030 < 0.005 0.0003 0.0310 0.0290 < 0.010 0.0047
0.4500 0.3500 0.04300 0.0340 < 0.005 0.0016 0.0340 0.0270 < 0.010 0.0130
0.0800 0.0640 < 0.04 0.0040 < 0.005 0.0031 0.0760 0.0660 < 0.010 0.0130
0.8200 0.6100 < 0.04 0.0130 < 0.005 0.0027 < 0.020 0.0100 0.0210 0.0140
0.3000 0.2200 < 0.04 0.0150 < 0.005 0.0027 < 0.020 0.0050 < 0.010 0.0120
0.6800 0.3300
0.2600 0.2300 < 0.04 0.0660 < 0.005 0.0002 < 0.020 0.0160 < 0.010 0.0180
0.7600 0.6000 0.0970 0.0860 0.0053 0.0019 0.0380 0.0320 < 0.010 0.0110
0.1600 0.1000 < 0.04 0.0050 0.0083 0.0038 0.0740 0.0630 < 0.010 0.0110
0.1200 0.0950 < 0.04 0.0220 < 0.005 0.0003 < 0.020 0.0020 0.0110 0.0160
0.3900 0.2900 < 0.04 0.0210 < 0.005 0.0024 < 0.020 0.0050 < 0.010 0.0089
0.7200 0.5800
0.3000 0.2900 < 0.04 < 0.002 < 0.005 0.0003 0.0300 0.0290 < 0.010 0.0092
0.3700 0.3000 0.0480 0.0460 < 0.005 0.0012 0.0230 0.0200 0.0120 0.0160
0.1600 0.0970 < 0.04 0.0140 0.0140 0.0100 0.3000 0.2100 < 0.010 0.0130
0.0820 0.0680 < 0.04 0.0120 < 0.005 0.0002 < 0.020 0.0020 0.0120 0.0160
0.3500 0.2800 0.1600 0.1500 < 0.005 0.0031 < 0.020 0.0060 < 0.010 0.0160
0.7300 0.6200
0.3800 0.3300 < 0.04 < 0.002 < 0.005 0.0003 0.0480 0.0490 < 0.010 0.0074
0.3900 0.3300 0.0460 0.0420 < 0.005 0.0013 0.0350 0.0330 < 0.010 0.0170
0.1400 0.1100 < 0.04 0.0330 0.0067 0.0049 0.1400 0.1200 < 0.010 0.0140
0.0790 0.2600 < 0.04 0.0850 < 0.005 0.0042 < 0.020 0.0080 0.0180 0.0140
0.3300 0.2300 0.0980 0.0140 0.0054 0.0017 < 0.020 0.0040 0.0110 0.0240
0.7000 0.6300

DATE
SOURCE
01/19/2000 PWC
DUPONT
WELLMAN
TECH PROCESS
CLARIFIER
OVERFLOW
COOLING TOWER 0.7100 0.6400
Savannah Lab versus Burlington Lab Comparison
STL = SAVANNAH LABS
BR = BURLINGTON RESEARCH
STL BR STL BR STL BR STL BR STL
ZINC ZINC NICKEL NICKEL LEAD LEAD COPPER COPPER CHROMIUM
0.3700 0.3500 < 0.04 < 0.002 < 0.005 0.0003 0.0480 0.0490
0.3800 0.3400 0.0450 0.0430 < 0.005 0.0012 0.0370 0.0330
0.1400 0.1100 < 0.04 0.0050 0.0097 0.0050 0.1500 0.1200
0.0740 0.0660 < 0.04 0.0120 < 0.005 0.0005 < 0.020 < 0.002
0.3300 0.2400 0.0950 0.0890 0.0076 0.0042 < 0.020 0.0080
< 0.010
< 0.010
< 0.010
0.0180
0.0100
BR
CHROMIUM
0.0057
0.0150
0.0140
0.0180
0.0150

ATTACHMENT II

01/03/U8 17:48 FAA 314 Uy4 88IU t n ruur'Laiiur =AZ
c P►� y� - o BPS P RpsisigeRoAl
LSubpartJ} Direct Discharge Point Sources That Use End -of -Pipe Biological
Treatment
§414.90 Applicabjiity; description of the subcategory of direct discharge
point sources that use end -of -pipe biological treabnent.
The provisions of this subpart are applicable to thepcooess wastewater
discha es resulting from the manufacture of the OCPSF produceand rodu
f .i•e
biolotical treatment or installs end -of -pipe biological treatment to comply with
BPT effluent limitations.
§414.91 Toxic pollutant effluent limitations and standards for direct
discharge point sources that use end -of -pipe biological treatment,
(a) Any point source subject to this subpart must achieve discharges not
exceeding the quantity (mass) determined by multiplying the process wastewater
flow subject to this subpart times the concentrations in the following table.
(b) In the se of chromium, co er lead nickel 'or,. and total c nide, the
discharge quantity (mass s all be determined by multiplying the concentrations
listed in the following table for these polluta fl tiWow pw fr m metal-bearfn�
waste� �for the r4 and times the ow from cyanide bearing waste
streams for total cyanide. Tie meta r(na waste streams and tanide_t�earir�a
waste streams - - d - t i - s y - s :. -
VA plus any additi • a •' PSF process wastewater streams identified by the
permitting.authority on a case -by -case basis as metal or cyanide bearing based
upon a determination that such streams contain significant amounts of .the
pollutants identified above. Any such streams designated as metal or cyanide
bearing must be treated independently of other metal or cyanide bearing waste
streams unless the permitting authority determines that the combination of such
streams, prior to treatment, with the Appendix A waste streams will result in
substantial reduction of these pollutants. This determination must be based upon
a review of relevant engineering, production, and sampling and analysis
information.
Effluent characteristics
-
_
Effluent imitations SAT and
NSPS1
Maximum for
any one day
Maximum for
for any
monthly
MMO
a
Aoeriaphthene
59
• 22
Aoenaphthyie
59
' 22
Ionttrile
- 242
96
An hracene
- 59
22
Benzene
•
136
- - 37
8 o(a)an hnicene
59
22
3,4-.Senzotiuoranthene
61
23
eenza(k)fluoranthene •
ve
22
Fes k
;it
k.4?

02 03%00 17:48 FAX J14 tiy4 88ZU LJn rUL:wa11U' 1L:_•1
f
•
Thionocarbamates, N-Ethyl-o-isopropyl/Isopropyl xanthate + Ethylamine
Toluene diamine (mixture)/Catalytic hydrogenation of dinitrotoluene
Methylated urea -formaldehyde resins (textile)/Methylation of urea -formaldehyde adduct
Methylated urea -formaldehyde glyoxol (textile resin)/Reaction of methylated urea -formaldehyde +
glyoxal
Zinc'
® 41ft, 4%xA
Methylhydroabietate, diets -alder adducts/Derivatives of abietic esters from rosin
Acrylic resins/Emulsion or solution polymerization to coatings +O imLtoArk 419
Acrylic resins (latex)/Emulsion polymerization of acrylonitrile with polybutadiene
Acrylic fibers (85% polyacrylonitrile) by solution polymerization/Wet spinning S nQ1/4"
Alkyd Resins/Condensation polymerization of phthalic anhydride + glycerin + vegetable oil esters
Benzene/By-product of styrene by ethylbenzene dehydrogenation
Benzene/By-product of vinyl toluene (from ethyltoluene)
n-butyl alcohol/Hydrogenation of n-Butyraldehyde, Oxo process
Coumarin (benz-a-pyrone)/Salicylaldehyde, Oxo process
Cycloparaffins/Catalytic hydrogenation of aromatics in kerosene solvent
Dithiocarbamates, zinc salt/Reaction of zinc oxide + Sodium dithiocarbamates
Dialkyldithiocarbamates, metal salts/Diakylamines + Carbon disulfide
Dithiocarbamates, metal saltslDithiocarbamic acid + metal oxide
Thiuram (dimethyldithiocarbamate) hexasuifide/Dimethytdithiocarbamate + sulfur
Fluorescent brighteners/Coumarin based
Ethyl acetate/Redox reaction (Tschenko) of acetaldehyde
Ethylbenzene/Benzene alkylation in liquid phase
Ethylbenzyl chloridelChloromethylation (Hydrogen chloride + formaldehyde, zinc chloride) of
ethylbenzene
2-Ethyl hexanol/Aldol condensation -hydrogenation of n-Butyraldehyde
Glyoxal-urea formaldehyde textile resin/Condensation to N-bis (hydroxymethyl) ureas + N,N'-
(Dihydroxyethyl) ureas
IsobutanollHydrooenation of isobutyraldehyde, Oxo process
IsopropanoUCatalytic hydrogenation of acetone
Methallylidene diacetatelCondensation of 2-Methypropenal + acetic anhydride
MethanoVLow pressure sythesis from natural gas via synthetic gas
Methyl chloride/Hydrochlorination of methanol
Methylethyl ketone/Dehydrogenation of sec-Butanol
Naphthenic acid salts
Nylon
Nylon 6 & 66 copolymers/Polycondensation of Nylon salt + Caproiatam
Nylon 6 fiber/Extrusion (melt spinning) -
Oxo alcohols, C12-C15/Hydroformylation & hydrogenation of.C11-C14 olefins
Phenolic urethan resins/Phenol + excess formaldehyde + Methylene aniline diisocyanate
Polystyrene (crystal) modified/Polystyrene + sulfonation, chioromethylation and/or amination
RayonNiscase process
SAN resin/Emulsion polymerization
Silicones: Silicone rubbers/Hydrolysis and condensation of chlorosilanes
Silicones: Silicone specialties (grease, dispersion agents, defoamers & other products)
Silicones: Silicone resins/Hydrolysis & condensation of methyl, phenyl & vinyl chlorosilanes
Silicones: Silicone fiuids/Hydrolysis of chlorosilanes to acyclic & cyclic organositoxanes
Stearic acid, metal salts/Neutralization with a metallic base
Styrene/Dehydrogenation of ethylbenzene
Styrene-butadiene resin/Emulsion polymerization
Vinyl acetate/Reduction of acetylene + acetic acid
Vinyl toluene/Dehydrogenation (thermal) of ethyltoluene
Xylenes, mixed/By-product vinyl toluene (from ethyltoluene)
Cyanide
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MONSANTO [1
Food • Health • Hope
February 9, 2000
Mr. Paul Rawls
NC DENR
Division of Water Quality
Wachovia Building, Suite 714
Fayetteville, NC 28301-5043
Dear Mr. Rawls:
MONSANTO COMPANY
AGRICULTURAL SECTOR
P.O. Box 2307
CEDAR CREEK ROAD
FAYETTEVILLE, NORTH CAROLINA 28302
PHONE [phone]
Thank you for giving us the opportunity to discuss the Zinc issue with Ms. Kramer and
yourself. Per your request and in support of clarifying the water usage transition history
from river water to the PWC water the tables below are attached.
River
PWC
Total Water Used
% River Water Used
% PWC Water Used
1996
1997
1998
1999
% Zinc Increase
from 1996 to 1999
1996 MGD
269
353
622
43%
57%
Lbs/Day
Water Usage
1997 MGD
52
536
588
9%
91%
Incoming Zinc
Lbs/Month
1998 MGD
6
572
578
1%
99%
1999 MGD
0
499
499
0%
100%
Lbs/Year
2.15
3.08
3.49
3.11
31%
66
94
106
94
30%
786
1127
1276
1131
31%
We hope that this data will further indicate the basis of conclusions we have drawn and
shared with you and indicated in our letter to Mr. Dave Goodrich on February 3, 2000.
•
Manhar N. Patel
Environmental Safety Health
Business Unit Manager
sms
Attachments
xc: Mr. Dave Goodrich
Ms Susan Wilson
Ms. Shannon Langley