DEQp00021598

Press Alt + R to read the document text or Alt + P to download or print.

DEQp00021598

/ 18

Entry Properties
Tags	Notification - OGC Reviewed
Modified	11/30/2017 2:32:40 PM
Created	11/29/2017 6:29:14 PM
Template
General Use

The URL can be used to link to this page

Home My WebLink AboutDEQp00021885�pF WAT�c�Q _O G 7 4 February 3, 2004 Mr. Michael E. Johnson, Environmental Manager DuPont Fluoroproducts 22828 Highway 87 W Fayetteville, North Carolina 28306-7332 Dear Mr. Johnson: Michael F. Easley, Governor State of North Carolina William G. Ross, Jr., Secretary Department of Environment and Natural Resources Alan W. Klimek, P.E., Director Division of Water Quality Subject: NPDES Permit Correction Permit No. NC0003573 Fayetteville Works Bladen County Division personnel received your comments on the issued NPDES permit for the above referenced facility and have corrected the permit accordingly. Specifically, the following corrections have been made the attached permit: • The facility name has been changed to "DuPont - Fayetteville Works'. • Reference to the Dymetrol process has been eliminated from the Supplement to Permit Cover Sheet. • Item number 4 on the Supplement to Permit Cover Sheet has been eliminated in recognition of the lack of process wastewater from the APFO process (not outfall 007). • Former item number 5 is now item number 4 on the Supplement to Permit Cover Sheet and has been modified to eliminate any reference to outfall 007. • The flow measurement location in condition A.(1) has been changed to "Effluent". • Conditions A.(4) and A.(6) have been deleted in recognition of the elimination of outfall 007. • Former condition A.(7) is now condition A,(5) and has been modified to eliminate any reference to outfall 007. • The flow measurement location for new condition A.(5) - former condition A.(7) - has been modified to read "Influent or Effluent" in recognition of the way that flow has historically been measured for outfall 002. • The sample type for fluoride in new condition A.(5) has been changed from grab to composite. • The sample frequency for conductivity in new condition A.(5) has been changed from monthly to weekly. • Instream monitoring for outfall 002 has; beg31; provisionally waived in recognition of the facility's participation in the Middle Cape Fear River Basin Association. Note 1 on new condition A. (5) has been modified to reflect such. 1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 - TELEPHONE 919-733-5083/FAX 919-733-0719 VISIT US ON THE WEB AT http://h2o.enr.state.nc.us/NPDES Mr. Johnson DuPont Fayetteville - NC0003573 Page 2 • Former condition A.(11) - Outfall Warning Condition - now condition A.(9) has been modified to allow the facility 30 days from the effective date of the permit to post the outfall warning sign. Regarding the effluent limitation for hexachlorobenzene, the US EPA adopted a new criteria for this parameter during DuPont's previous permit cycle. As such, the allowable concentration for hexachlorobenzene has lowered accordingly. Compliance with all terms and conditions of the attached permit is the responsibility of the Permittee. Please note that T15A 08G .0204 of the North Carolina Administrative Code has been interpreted to mean that the Operator in Responsible Charge is responsible for operation of water pollution control systems. If any parts, measurement frequencies or sampling requirements contained in this permit are unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty (30) days following receipt of this letter. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless such demand is made, this permit shall be final and binding. Please take notice that this permit is not transferable. This permit does not affect the legal requirements 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 governmental permits which may be required. If you have any questions or need additional information, please do not hesitate to contact Mark McIntire of my staff at (919) 733-5083, extension 508. Sincerely, iejhal��- Alan W. Klimek, P.E. cc: Central Files NPDES Unit Files Fayetteville Regional Office Aquatic Toxicology Unit EPA Region 4 Permit NC0003573 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY PFRMTT TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards and regulations promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water Pollution Control Act, as amended, E.I. DuPont de Nemours & Co. is hereby authorized to discharge wastewater and stormwater from a facility located at DuPont - Fayetteville Works NC Highway 87 Duart Township Bladen County to receiving waters designated as the Cape Fear River in the Cape Fear River Basin in accordance with effluent limitations, monitoring requirements, and other conditions set forth in Parts I, II, III, and IV hereof. The permit shall become effective February 3, 2004. This permit and the authorization to discharge shall expire at midnight on October 31, 2006. Signed this day February 3, 2004. +--Alan W. Klimek, P. E., Director Division of Water Quality By Authority of the Environmental Management Commission Permit NC0003573 SUPPLEMENT TO PERMIT COVER SHEET All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked, and as of this issuance, any previously issued permit bearing this number is no longer effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements, terms, and provisions included herein. E.I. DuPont de Nemours & Co., Inc. is hereby authorized to: 1. Continue to operate existing wastewater treatment facilities consisting of: • equalization; • neutralization; • aerated pre -digester tank; • nutrient feed system; • aeration tank with Biomixer0; • dual clarifiers; • effluent flow measurement; • DAF unit; • rotary filter for sludge thickening; • sludge filter press; and • steam heated sludge dryers. 2. Discharge treated process wastewater from Butacite, Nafion, and Teflon® PMDF, process stormwater, sanitary wastewater, and co -neutralized regenerate from said treated facilities through internal outfall 001; 3. Discharge Nafion low -biodegradable wastewater through internal outfall 006; 4. Discharge stormwater, non -contact cooling water, boiler blowdown and condensate, treated wastewater effluent from 001, and effluent from outfall 006 through outfall 002 at the location specified on the attached map into the Cape Fear River, a class C water in the Cape Fear River Basin. Permit NC0003573 A. (1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Beginning on the effective date of this permit and lasting through the expiration date, the Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: PARAMETER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS Monthly Daily Average Maximum Measurement Sample Sample Frequency e Location Flow (MGD) 2.0 Continuous Recording Effluent BOD;, 20° C 191.3 lbs/day 508.2 lbs/day 3/Week Composite Effluent Total Suspended Solids 317.8 lbs/day 1030 lbs/day 3/Week Composite Effluent Temperature Weekly Grab Effluent Oil & Grease Monthly Grab Effluent Chronic Toxicity See Note 1 Quarterly Composite See Note 1 pH Between 6.0 and 9.0 Standard Units 3/Week Grab Effluent 40 CFR 414 Subpart I See Condition A. (2) Notes: 1 Chronic Toxicity (Ceriodaphnia) P/F @ 3.3% February, May, August, November; see condition A. (6) of this permit. The compliance monitoring point for chronic toxicity shall be downstream of the confluence of outfall 001 and 002. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. Permit NC0003573 A. (2) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - SUBPART I Beginning on the effective date of this permit and lasting through the expiration date, the Permittee shall comply with the limitations and monitoring frequencies established below at outfall 001: PARAME'T'ER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS Monthly Average Daily Maximum' Measurement Frequency Sample e Sample Location Acenaphthene 0.174 0.465 See Note 2 Grab Effluent Acenaphthylene 0.174 0.465 See Note 2 Grab Effluent Acrylonitrile 0.757 1.909 See Note 2 Grab Effluent Anthracene 0.174 0.465 See Note 2 Grab Effluent Benzene 0.292 1.073 See Note 2 Grab Effluent Benzo(a)anthracene 0.174 0.465 See Note 2 Grab Effluent 3,4-Benzofluoranthene 0.181 0.481 See Note 2 Grab Effluent Benzo(k)fluoranthene 0.174 0.465 See Note 2 Grab Effluent Benzo(a)pyrene 0.181 0.481 See Note 2 Grab Effluent Bis(2-ethylhexyl) phthalate 0.813 2.201 See Note 2 Grab Effluent Carbon Tetrachloride 0.142 0.300 See Note 2 Grab Effluent Chlorobenzene 0.118 0.221 See Note 2 Grab Effluent Chloroethane 0.821 2.114 See Note 2 Grab Effluent Chloroform 0.166 0.363 See Note 2 Grab Effluent 2 -Chlorophenol 0.245 0.773 See Note 2 Grab Effluent Chrysene 0.174 0.465 See Note 2 Grab Effluent Di -n -butyl phthalate 0.213 0.450 See Note 2 Grab Effluent 1,2 -Dichlorobenzene 0.608 1.286 See Note 2 Grab Effluent 1,3 -Dichlorobenzene 0.245 0.347 See Note 2 Grab Effluent 1,4 -Dichlorobenzene 0.118 0.221 See Note 2 Grab Effluent 1,1-Dichloroethane 0.174 0.465 See Note 2 Grab Effluent 1,2-Dichloroethane 0.536 1.665 See Note 2 Grab Effluent 1,1-Dichloroethylene 0.126 0.197 See Note 2 Grab Effluent 1,2-trans-Dichloroethylene 0.166 0.426 See Note 2 Grab Effluent 2,4-Dichlorophenol 0.308 0.884 See Note 2 Grab Effluent 1,2-Dichloropropane 1.207 1.815 See Note 2 Grab Effluent 1,3-Dichloropropylene 0.229 0.347 See Note 2 Grab Effluent Diethyl phthalate 0.639 1.602 See Note 2 Grab Effluent 2,4 -Dimethylphenol 0.142 0.284 See Note 2 Grab Effluent Dimethyl phthalate 0.150 0.371 See Note 2 Grab Effluent 4,6-Dinitro-o-cresol 0.615 2.185 See Note 2 Grab Effluent 2,4-Dinitrophenol 0.560 0.970 See Note 2 Grab Effluent 2,4-Dinitrotoluene 0.892 2.249 See Note 2 Grab Effluent 2,6-Dinitrotoluene 2.012 5.057 See Note 2 Grab Effluent Ethylbenzene 0.252 0.852 See Note 2 Grab Effluent Permit NC0003573 A. (2) SUBPART I REQUIREMENTS (CONTINUED) Beginning on the effective date of this permit and lasting through the expiration date, the Permittee shall comply with the limitations and monitoring frequencies established below at outfall 001: .PARAMETER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS Monthly Avera el Daily Maximum' Measurement Frequency Sample e Sample Location Fluoranthene 0.197 0.536 See Note 2 Grab Effluent Fluorene 0.174 0.465 See Note 2 Grab Effluent Hexachlorobenzene 0.5 µg/L Annually3 Grab Effluent Hexachlorobutadiene 0.158 0.387 See Note 2 Grab Effluent Hexachloroethane 0.166 0.426 See Note 2 Grab Effluent Methyl Chloride 0.679 1.499 See Note 2 Grab Effluent Methylene Chloride 0.316 0.702 See Note 2 Grab Effluent Naphthalene 0.174 0.465 See Note 2 Grab Effluent Nitrobenzene 0.213 0.536 See Note 2 Grab Effluent 2-Nitrophenoi 0.323 0.544 See Note 2 Grab Effluent 4-Nitrophenol 0.568 0.978 See Note 2 Grab Effluent Phenanthrene 0.174 0.465 See Note 2 Grab Effluent Phenol 0.118 0.205 See Note 2 Grab Effluent Pyrene 0.197 0.529 See Note 2 Grab Effluent Tetrachloroethylene 0.174 0.442 See Note 2 Grab Effluent Toluene 0.205 0.631 See Note 2 Grab Effluent 1,2,4-Trichlorobenzene 0.536 1.105 See Note 2 Grab Effluent 1,1,1 -Trichloroethane 0.166 0.426 See Note 2 Grab Effluent 1,1,2 -Trichloroethane 0.166 0.426 See Note 2 Grab Effluent Trichloroethylene 0.166 0.426 See Note 2 Grab Effluent Vinyl Chloride 0.821 2.114 See Note 2 Grab Effluent Notes - 1 All units are lbs/day unless otherwise noted. 2 Monitoring for the specified parameters has been waived based on a demonstration made by the Permittee in accordance with 40 CFR 122.44(a)(2)(i). This waiver is good only for the term of the permit. Please note that any exceedence of the effluent limitations found herein shall be considered a permit violation subject to appropriate enforcement action. 3 A sufficiently sensitive analytical technique shall be employed for determining the presence of hexachlorobenzene in the effluent. Permit NC0003573 A. (3) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Beginning on the effective date of this permit and lasting through the expiration date, the Permittee is authorized to discharge from Outfall 006 (Naflon® low -biodegradable process wastewaters). Such discharges shall be limited and monitored by the Permittee as specified below: PARAMETER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS Monthly Daily Average Maximum Measurement Sample Sample Frequency e Location Flow (MGD) 0.036 Continuous Recording Effluent BODS, 200 C 7.2 lbs/day 19.21bs/day Monthly Composite Effluent Total Suspended Solids 12.0 lbs/day 39.0 lbs/day Monthly Composite Effluent pH Between 6.0 and 9.0 Standard Units 3/Week Grab Effluent 40 CFR 414 Subpart J See Condition A. (4) THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. Permit NC0003573 A. (4) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - SUBPART J Beginning on the effective date of this permit and lasting through the expiration date, the Permittee shall comply with the limitations and monitoring frequencies established below at outfall 006: PARAMETER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS Monthly Average' Daily Maximum' Measurement Frequency Sample Type Sample Location Acenaphthene 0.006 0.014 Annually Grab Effluent Acenaphthylene 0.006 0.014 Annually Grab Effluent Acrylonitrile 0.028 0.070 Annually Grab Effluent Anthracene 0.006 0.014 Annually Grab Effluent Benzene 0.017 0.040 Annually Grab Effluent Benzo(a)anthracene 0.006 0.014 Annually Grab Effluent 3,4-Benzofluoranthene 0.006 0.014 Annually Grab Effluent Benzo(k)fluoranthene 0.006 0.014 Annually Grab Effluent Benzo(a)pyrene 0.006 0.014 Annually Grab Effluent Bis(2-ethylhexyl) phthalate 0.029 0.077 Annually Grab Effluent Carbon Tetrachloride 0.043 0.114 Annually Grab Effluent Chlorobenzene 0.043 0.114 Annually Grab Effluent Chloroethane 0.033 0.089 Annually Grab Effluent Chloroform 0.033 0.098 Annually Grab Effluent Chrysene 0.006 0.014 Annually Grab Effluent Di -n -butyl phthalate 0.006 0.013 Annually Grab Effluent 1,2 -Dichlorobenzene 0.059 0.238 Annually Grab Effluent 1,3 -Dichlorobenzene 0.043 0.114 Annually Grab Effluent 1,4 -Dichlorobenzene 0.043 0.114 Annually Grab Effluent 1,1-Dichloroethane 0.007 0.018 Annually Grab Effluent 1,2-Dichloroethane 0.054 0.172 Annually Grab Effluent 1,1-Dichloroethylene 0.007 0.018 Annually Grab Effluent 1,2-trans-Dichloroethylene 0.008 0.020 Annually Grab Effluent 1,2-Dichloropropane 0.059 0.238 Annually Grab Effluent 1,3-Dichloropropylene 0.059 0.238 Annually Grab Effluent Diethyl phthalate 0.014 0.034 Annually Grab Effluent 2,4 -Dimethylphenol 0.006 0.014 Annually Grab Effluent Dimethyl phthalate 0.006 0.014 Annually Grab Effluent 4,6-Dinitro-o-cresol 0.023 0.083 Annually Grab Effluent 2,4-Dinitrophenol 0.362 1.288 Annually Grab Effluent Ethylbenzene 0.043 0.114 Annually Grab Effluent Fluoranthene 0.007 0.01.6 Annually Grab Effluent Fluorene 0.006 0.044 Annually Grab Effluent Hexachlorobenzene 0.5 µg/L Annually Grab Effluent Permit NC0003573 A. (4) SUBPART J REQUIREMENTS (CONTINUED) Beginning on the effective date of this permit and lasting through the expiration date, the Permittee shall comply with the limitations and monitoring frequencies established below at outfall 006: PARAMETER EFFLUENT LIMITATIONS MONITORING REQUIREMENTS Monthly Average' Daily Maximum? Measurement Frequency Sample e Sample Location Hexachlorobutadiene 0.043 0.114 Annually Grab Effluent Hexachloroethane 0.059 0.238 Annually Grab Effluent Methyl Chloride 0.033 0.089 Annually Grab Effluent Methylene Chloride 0.011 0.051 Annually Grab Effluent Naphthalene 0.006 0.014 Annually Grab Effluent Nitrobenzene 0.672 1.922 Annually Grab Effluent 2-Nitrophenol 0.020 0.069 Annually Grab Effluent 4-Nitrophenol 0.049 0.173 Annually Grab Effluent Phenanthrene 0.006 0.014 Annually Grab Effluent Phenol 0.006 0.014 Annually Grab Effluent Pyrene 0.006 0.014 Annually Grab Effluent Tetrachloroethylene 0.016 0.049 Annually Grab Effluent Toluene 0.008 0.022 Annually Grab Effluent 1,2,4-Trichlorobenzene 0.059 0.238 Annually Grab Effluent 1,1,1 -Trichloroethane 0.007 0.018 Annually Grab Effluent 1,1,2 -Trichloroethane 0.010 0.038 Annually Grab Effluent Trichloroethylene 0.008 0.021 Annually Grab Effluent Vinyl Chloride 0.029 0.052 Annually Grab Effluent Notes: 1 All units are lbs/day unless otherwise noted. Should any annual monitoring result in detection of any Subpart J parameters, quarterly monitoring will begin immediately for the detected parameter(s). After four consecutive quarterly samples resulting in non -detection, the monitoring frequency will revert to annually. Permit NC0003573 A. (5) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS Beginning on the effective date of this permit and lasting through the expiration date, the Permittee is authorized to discharge from Outfall 002 (boiler blowdown, once -through cooling water, treated wastewater from outfall 001, and Nafion low -biodegradable process wastewaters from outfall 006). Such discharges shall be limited and monitored by the Permittee as specified below: Notes: 1 Upstream shall be at the Permittee's river pump station; downstream shall be at the boat ramp approximately 4500 feet downstream at Prospect Hall Landing. Instream sampling requirements are provisionally waived in recognition if the facility's participation in the Cape Fear River Basin Association. Should the facility's membership status change, instream monitoring requirements shall be immediately reinstated. 2 The temperature of the effluent shall be such as not to cause an increase in the temperature of the receiving stream of more than 2.80C and in no case cause the ambient water temperature to exceed 320C. 3 Daily shall be defined as every day except Saturdays, Sundays, and legal holidays. Instream temperature sampling shall be conducted weekly. 4 The samples for fluoride shall be taken downstream of the 001 discharge, unless or until, all neutralized Nafion area streams are discharged entirely into the cooling water outfall, 002. Instream fluoride monitoring shall be conducted monthly and shall coincide with effluent monitoring. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. EFFLUENT LIMITATIONS MONITORING REQUIREMENTS PARAMETER. Monthly Daily Measurement Sample Sample Average Maximum Frequency e Location' Flow (MGD) Continuous Recording Influent or Effluent Effluent, Temperature, °C See Note 2 Daily -3 Grab Upstream, Downstream BODS, 20° C Quarterly Composite Effluent COD Quarterly Composite Effluent Effluent, Fluoride4 7917lbs/day Weekly Composite Upstream, Downstream Dissolved Oxygen Weekly Grab Upstream, Downstream Total Phosphorus Monthly Composite Effluent Total Nitrogen Monthly Composite Effluent (NO2+NO3+TKN) Conductivity Weekly Grab Upstream, Downstream PH Between 6.0 and 9.0 Standard Units 3/Week Grab Effluent Notes: 1 Upstream shall be at the Permittee's river pump station; downstream shall be at the boat ramp approximately 4500 feet downstream at Prospect Hall Landing. Instream sampling requirements are provisionally waived in recognition if the facility's participation in the Cape Fear River Basin Association. Should the facility's membership status change, instream monitoring requirements shall be immediately reinstated. 2 The temperature of the effluent shall be such as not to cause an increase in the temperature of the receiving stream of more than 2.80C and in no case cause the ambient water temperature to exceed 320C. 3 Daily shall be defined as every day except Saturdays, Sundays, and legal holidays. Instream temperature sampling shall be conducted weekly. 4 The samples for fluoride shall be taken downstream of the 001 discharge, unless or until, all neutralized Nafion area streams are discharged entirely into the cooling water outfall, 002. Instream fluoride monitoring shall be conducted monthly and shall coincide with effluent monitoring. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. Permit NCO 003573 A. (6) CHRONIC TOXICITY PERMIT LIMIT (QUARTERLY) — OUTFALL 001 The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 3.3%. The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or subsequent versions or "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The tests will be performed during the months of February, May, August, and November. Effluent sampling for this testing shall be performed at the NPDES permitted final effluent discharge below all treatment processes. If the test procedure performed as the first test of any single quarter results in a failure or ChV below the permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the two following months as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. The chronic value for multiple concentration tests will be determined using the geometric mean of the highest concentration having no detectable impairment of reproduction or survival and the lowest concentration that does have a detectable impairment of reproduction or survival. The definition of "detectable impairment," collection methods, exposure regimes, and further statistical methods are specified in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -February 1998) or subsequent versions. All toxicity testing results required as part of this permit condition will be entered on the Effluent Discharge Monitoring Form (MR -1) for the months in which tests were performed, using the parameter code TGP313 for the pass/fail results and THP313 for the Chronic Value. Additionally, DWQ Form AT -3 (original) is to be sent to the following address: Attention: Environmental Sciences Branch North Carolina Division of Water Quality 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Branch no later than 30 days after the end of the reporting period for which the report is made. Test data shall be complete, accurate, include all supporting chemical/physical measurements and all concentration/response data, and be certified by laboratory supervisor and ORC or approved designate signature. Total residual chlorine of the effluent toxicity sample must be measured and reported if chlorine is employed for disinfection of the waste stream. Should there be no discharge of flow from the facility during a month in which toxicity monitoring is required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test form indicating the facility name, permit number, pipe number, county, and the month/year of the report with the notation of "No Flow" in the comment area of the form. The report shall be submitted to the Environmental Sciences Branch at the address cited above. Should the permittee fail to monitor during a month in which toxicity monitoring is required, monitoring will be required during the following month. Should any test data from this monitoring requirement or tests performed by the North Carolina Division of Water Quality indicate potential impacts to the receiving stream, this permit may be re -opened and modified to include alternate monitoring requirements or limits. NOTE: Failure to achieve test conditions as specified in the cited document, such as minimum control organism survival, minimum control organism reproduction, and appropriate environmental controls, shall constitute an invalid test and will require immediate follow-up testing to be completed no later than the last day of the month following the month of the initial monitoring. Permit NC0003573 A. (7) RE -OPENER CONDITION This permit shall be modified, or revoked and reissued to incorporate additional toxicity limitations and monitoring requirements in the event toxicity testing or other studies conducted on the effluent or receiving stream indicate that detrimental effects may be expected in the receiving stream as a result of this discharge. A. (8) BIOCIDE CONDITION The permittee shall not use any biocide except those approved in conjunction with the permit application. The permittee shall notify the Director in writing not later than ninety (90) days prior to instituting use of any additional biocide used in cooling systems which may be toxic to aquatic life other than those previously reported to the Division of Water Quality. Such notification shall include completion of Biocide Worksheet Form 101 and a map locating the discharge point and receiving stream. A. (9) OUTFALL WARNING CONDITION Within 30 days of the effective day of this permit, the permittee shall post a sign along the wastewater conveyance. This sign shall include language that indicates the channel to be an industrial wastewater conveyance no recommended for recreational purposes. This sign shall also provide appropriate DuPont contact information in the event members of the public have questions or concerns.