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Home My WebLink AboutNC0020443_PERMIT Issuance_19990118State of North Carolina Department of Environment and Natural Resources + • • Division of Water Quality ooftftT James B. Hunt, Jr., Governor Wayne McDevitt, Secretary A. Preston Howard, Jr., P.E., Director D E N R January 18, 1999 Mr. Carlisle Harrell Manager, Town of Columbia Post'Office Box 361 Columbia, North Carolina 27925 Subject: Issuance of NPDES Permit Permit No. NCO020443 Columbia WWTP Tyrell County Dear Mr. Harrell: This letter is to inform you that the Division has finalized its review and the comment period is now closed for NPDES permit NC00020443. A final copy of the permit is attached to this letter for your records. This permit is issued pursuant to the requirements of the North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the US Environmental Protection Agency dated December 6, 1983. 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, Post Office Drawer 27447, Raleigh, North Carolina 27611-7447. Unless such demand is made, this decision shall be final and binding. Please be advised that this permit is not transferable. Part 11, EA. addresses the requirements to be followed in case of change in ownership or control of this discharge. In addition, 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 governmental permit that may be required. In closing, I would like to state that it is the Division's ultimate goal to provide quality service to the public. Please take a moment to review the procedures you followed in applying for this permit renewal in addition to the Division's response to your project needs. If we can improve our service to you in any manner, please bring it to our attention. We appreciate your cooperation during the renewal process and we Iook forward to working with you in the future. P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone 919-733-5083 FAX 919-733-0719 An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper Issuance of NPDES Permit Permit No. NCO020443 Columbia WWTP Page 2 of 2 If we can be of further assistance to you or if you would like to suggest any improvements we can make to strengthen our customer service efforts, please do not hesitate to contact Jeff Myhra of my staff at (919) 733-5083, extension 597. Sincerely, Original Signed By 09-vid A .Goodri h . A. Preston Howar�, Jr., P.E. cc: Central Files Mr. Roosevelt Childress, EPA Washington Regional Office / Water Quality Section Point Source Compliance Enforcement Unit %NPDES"Unit /'Peimit'file Permit No. NCO020443 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY TO DISCHARGE WASTEWATER UNDER THE NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM In compliance with the provision 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, Town of Columbia is hereby authorized to discharge wastewater from a facility located at the Town of Columbia WWTP 1209 Road Street Columbia Tyrrell County to receiving waters designated as Scuppernong River in the Pasquotank 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 March 1, 1999 This permit and the authorization to discharge shall expire at midnight on March 31, 2003 Signed this day January 18, 1999 Original Signed_ By David A. Goodrich A. Preston Howard, Jr.,Director Division of Water Quality By Authority of the Environmental Management Commission Permit No. NCO020443 SUPPLEMENT TO PERMIT COVER SHEET Town of Columbia is hereby authorized to: 1. Continue to operate a 0.30 MGD wastewater treatment facility consisting of a bar screen grit removal chamber, oxidation ditch (biological treatment, 30-hours detention time), dual secondary clarifiers, chlorination and pumping facilities, sludge digestion tank and sludge holding tank (90 days), and dechlorination/post aeration chamber located at the Town of Columbia WWTP, 1209 Road Street, Dare County (See Part III of this permit), 2. Discharge from said treatment works at the location specified on the attached map into Scuppernong River which is classified as SC waters in the Pasquotank River Basin, and • Foul • „ i -- � �� , � e •� _ \�' n Piiin6 --:Foul. :�.—C _ -- -- QLUMBIA' •.� t. — — — 1 O :....` ..:-:T — - �o._ � •.r T _ �.. \ -� {$M ZZ1 ' fee. t f /aDiseharge point - `'-•t=-s w Piling .awing\ plr=T bi H.id21 3975 BM fE) . _. _ - Uj '� Le ROAD CLASSIFICATION PRIMARY HIGHWAY LIGHT-OUTY ROAD, HARD OR HARD SURFACE IMPROVED SURFACE SECONDARY HIGHWAY HARD SURFACE UNIMPROVED ROAD Latitude 25555-11= Longitude 76211524' Map # D33NE Sub -basin 301531 Stream Class sc Discharge Codes 01 Receiving Stream • Scuppernong River Design Q 0.03 MGD ,"Permit expires 0 313 1 / 03 SCALE 1 :24 000 0 1 MILE 0 7000 FEET Mg P-P 1 0 1 KILOMETER CONTQUR INTt RVAL 5 FEET` QUAD LOCATION Town of Columbia WWTP NCO020433 Tyrrell County . A.(1) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NCO020443 During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from outfali serial number 001. Such discharges shall be limited and monitored by the Permittee as specified below: C i 1A3 'Tk'{E+,xt C".1a�� 9r11'?i,, ��tii_ rf �`AV.er,�a + .:�:t. ;�itt • i rI"�-'i..ra, - MONITTOR3NG #REGJriIRE NTi;� �s G�I i. Mnnthlyl�;{..z ��.r:L.ar 4'.:a<t4', Ai. e� j �T �F "Weeklji.t`° . .rr! .7�7z c�Aver� a li;�3 i., •may.-?y—rt '__� r•Dally,;,t ;{�( IFtMaxkmljm,F I — t,Measiireitierit h=/1i sa:.,�::i*4 i.SYFre ueiac l `;ti5ample' X k:Ef �.5 i, :�..(Iv ":;y., 5 �37: e i — -:;,5 »: Sariipl:e4 {>l/inli I,61379 � � tlon;Rs o.c a Flow 0.3 MGD Continuous Recording I or E BOD 5 day, 20°C2 15.0 m /l 22.5 m /I 31Week -Composite E, Total Suspended Solids2 30.0 m /I 45.0 m /I 3/Week Composite E, I NH3 as N 4.0 mg/1 3/Week Composite E Dissolved Oxygen 3. 5 3/Week Grab E Fecal Coliform(geometric means 200/100 ml 400/100 ml 3/Week Grab E Total Residual Chlorine 28 /l 3/Week Grab E Tem erature5 Daily Grab E Total Nitrogen (NO2 + NO3 + TKN)5 Quarterly Composite E Total Phos horus5 Quarterly Com osite E H4' 5 3/Week Grab E Salinit s Weekly Instantaneous See Note 5 Conductivit s Weekly Instantaneous See Note 5 TKN5 2/Month See Note 5 See Note 5 NH35 2/Month See Note 5 See Note 5 NO2 + N035, 2/Month 4 See Noth 5 See Nate 5 Chloro h II-a5 2/Month See Note 5 See Note 5 Notes: 1 Sample localionw. E - Effluent, I - Influent. 2 The monthly average effluent BODS and Total Suspended solids concentrations shall not exceed 15 percent of the respective influent value (85 percent removal). 3 The daily average' dissolved oxygen effluent concentration shall not be less than 6.0 mg/l. 4 The pH shall not be less than 6.8 standard units nor greater than 8.5 standard units and shall be monitored as per the requirements outlined in Special Condition A.(3). on the, Supplement to Effluent Limitations and Monitoring Requirements Page. 5 Special monitoring requirements for Dissolved Oxygen, Temperature, Conductivity, Salinity, pH, TKN, NH3, NO2 + NO3, and Chlorophyll -a are included in Special Condition A.(3). on the Supplement to Effluent Limitations and Monitoring Requirements Page. There shall be no discharge of floating solids or visible foam in other than trace amounts. Special permit conditions applicable to the subject facility are listed on the Supplement to Effluent Limitations and Monitoring Requirements Page. Permit No. NCO020443 SUPPLEMENT TO EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - SPECIAL CONDITIONS A.(2) Nutrient Condition The Division may modify, or revoke and reissue this permit to include effluent limitation(s) for nutrient(s) bases upon any of the following: 1. The findings of a river study by the Division of Water Quality which determines that nutrient control is necessary to protect water quality in the receiving waters. 2. Findings which show that local actions do not successfully reduce the nutrient Ioading on the receiving waters. 3. The onset of problem conditions in the receiving waters. A.(3). Instream Monitoring Requirements The Permittee should conduct its monitoring as defined below, from June 1 through September 30 of each year, to determine the effectiveness of nutrient reduction measures at the facility Samples shall be collected between June 1 and September 30 each year. Physical Parameters: aramete '� _ xr • anZp e ype�" � requency ' isso ve xygenInstantaneous Weekly emperatureInstantaneous Weekly Conductivity' Instantaneous Weekly sallmtyj Instantaneous Weekly pInstantaneous See Note Notes: f The above parameters shall be collected as grab samples at one meter intervals vertically throughout the water column. 2 pH shall be collected only when Chlorophyll -a is collected. Permit No. NCO020443 SUPPLEMENT TO EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS --. SPECIAL CONDITIONS (Continued) Chemical Parameters: 2/Month NH31Month z + N031 _'�/Month oEl Nitrogen'2/Month Totalosp orus 2/month Chiorophyll-al2/Month I-ecal Coliform)See Note _ Notes: t TKN, NH3, NOz + NO3, Total Nitrogen, Total Phosphorus, and Chlorophyll -a shall be collected by a spatial composite throughout the photic zone (defined as twice the secchi depth). 2 Fecal CoIiforrn shall be collected as a grab sample approximately 6 inches below the water surface. Sample locations (see attached map): • Upstream at US Highway 64 Bridge; • Downstream at marker number 10; • Treated effluent at end of pipe. Reporting Requirements: Data results must be entered on a form approved by the Division of.Water Quality and summarized in an annual report. This report is due on January 1 immediately following the summer period when sampling occurred. This report must be sett to the following address: Point Source Compliance Enforcement Unit Division of Water Quality Post Office Box 29535 Raleigh, North Carolina 27626-0535 - _� 12,'01/98 11:05 FAX 919 829 4824 NEWS & OBSERN'FR -- �-- 16002/002 - 7 PUBLIC NOTICE STATE OF NORTH CAROLINA =� ENVIRONMENTAL MANAGEMENT COMMISSION POST OFFICE 13OX 295W RALEIGH, NORTH CAROLINA 276264 S ;} - `• NOTIFICATION OI^ INTENT TO �• ISSUE A STATE NPDES PERMIT On the basis of thorough staff review and application of Article 21 of Chapter 143, General Statutes of North Carolina, Public -. Law 92-500 and other lawful standards and regulations, the !•-.�• North Carolina Environmental Management Commission pro- -� poses to issue a permit to discharge to the persons listed below effective IIIW99 and subiect to special conditions. Persons wishing to comment upon or object to the proposed determinations are invited to submit some in writing to the �} above address no later than 12/28/98. All comments received prior to that date will be considered in the formulation of final determinations regarding the proposed permit. A public meet- ing may be held where the Director of the Division of Environ- mental Management finds a significant degree of public interest in a proposed permit. ; A copy of the draft permit is available by writing or tailing the Division of Environmental Management, P.O, Box 29535, Ro- leigh, North Carolina 27676-0535, (919) 733-7015. Theapplication and other information may be inspected atthese locations during normal office hours. Copies of the information on file are available upon request and payment of the costs of reproduction. All such comments or requests regarding aJM r� proposed permit should make reference to the NPDES permit dumber listed below. Date 11I25f98 O O Z r Isl David A<dod1wV'J4. Prestar� Nrd, ur„ -P.E., Director-/ Division a �f:-Envi_ronmental Management• � - 'Publit"6dtice of inient to iss"U L.' 'a 'ate NPDI_s permit to the following: 1(_4N DPDP ESrNo. NCO026-4 Town of Columbia, PO Box 361, Columbia; NC`27925Jhbs -applied for a permit renewal for a facility located at the Town of Columbia WWTP, 1209 Ruud Street, Columbia, Tyrrell County. The facility discharges 0.30 _ MG of treated domestic wastewater from one outfalI into the - Scuppernong River, a Class 5C stream in the Posquotank River Basin. Ammonia, BOD5 and dissolved oxygen are water quality limited. For some parameters, the available load capacity of the immediate receiving water will be consumed. This may affect future water quality based effluent limitations for additional discharges within this portion of the watershed. rJ 2. NPDES No. NC0007510. Town of Columbia, 103 Main Street, ` Columbia, NC 27925 has applied for a permit renewal for their ;y WoterTreatment Plant located at510 N. Light Street, Columbia, Tyrrell County. The facility discharges filter backwash water from one outfall into an unnamed tributary to the Scuppernong River, a Class SC stream In the Posquotank River Basin, No parameters are water quality limited, but this discharge may affect future allocations. N&O: December 2, 1998 Staff Review and Evaluation NPDES Wastewater Permit FACILITY INFORMATION Facility Columbia WWTP NPDES No. NC0020443 Design Flow (MGD) 0.3 Facility Class III STREAM CHARACTERISTICS Stream Name Scuppernong River Stream Class SC Sub -basin 03-01-53 Drainage Area (mil) S7Q10 (cfs) TIDAL W7Q10 (cfs) 30Q2 (cfs) IWC (%) Proposed Changes Parameters Affected Basis for change(s) Permit C over-sfi eet Added Part IV reference Not part of previous permit Supplement to Permit Cover eet Revised plant description to match ATC issue -20-95 for upgrade to installation of 0.3 MGD plant. 0.3 MGD. Effluent Limitations and Moii—itoring Deleted effluent page for 0, 1,-) MOD A I C issue - - a tor upgrade to Requirements Page flow. 0.3 MGD. Effluent Limitations and Monitoring Revised monitoring trequency tor Revised as per 213.0500s for plant Requirements Page BOD, TSS, NH3N, DO, Fecal classified as Class III. Coliform, pH and TRC from weekly to 3/week. Effluent Limitations and MoFi—toring Aaaed the physical and chemical asier tbr the Permittee to rea t e Requirements Page instream monitoring parameters to permit. the effluent limitations and monitoring requirements page. Compliance Schedule: n/a Special Condition(s): See Special Conditions page. Permits & Engineering Comments: This is a permit renewal with no reference to modifications at the existing 0.3 MGD facility. The previous WLA for this facility for Q, = 0.225 MGD recommended 13PJ limits of BOD@H3 = 15/4 and DO = 6.0 mg/l in order to minimize the discharger's contribution to an existing water quality problem ((in 1994 the 305-B report @ NCSR 1105 (6 miles upstream of Columbia) was listed as non -supporting due to low DO levels)). The same limits were used to develop the WLA for the upgrade to 0.3 MGD. It is expected that with an estimated 20 CFS of freshwater input to this system, that mixing and dilution are extensive enough that the 4.0 mg/l NH3N limit will be fully adequate to prevent ammonia toxicity from occurring instream. No WET testing was recommended since the facility is a minor, 100 percent domestic discharge with no risk of ammonia toxicity. • No special basinwide management strategies apply. The use support rating for Scuppernong River is Partially supporting. The following information in relation to the Scuppernong River is included in the Basin plan: Biological and ambient chemistry data indicate that water quality is depressed. Both point and non -point sources of pollution are thought to be contributing to the problem. The NPS team should consider targeting this area and WQ will investigate the potential of impairment from the WWTP. n Columbia WWTP NC0020443 Page 2 of 2 Region, please comment on the need for additional special conditions in response to the language referenced in the basin plan. • DMR Data: TSS Violation April 1997 (36.9 mg/l) Fecal Coliform Violation April 1997 (384.9 #/100ml) Fecal Coliform Violation February 1997 (506.9 4/100ml) Fecal Coliform Violation December 1996 (283.8 #1100m1) TSS Violation August 1995 (50p mg/l) lnstream Monitoring: Facility is conducting instream monitoring (monitoring from June I to September 30) as specified in the permit. Facility is still showing low DO levels at the effluent and downstream of the discharge point (in range of 1.7 - 5.9mg/1). It is recommended that the permit be renewed as drafted. Prepared by: Regional Office Evaluation and Recommendations: Srt Av /.t .+.... ,L'f c_ v h �s.a-'%`��L-.`.J` �; (� ., , `�. rr--� Cv.k ArizA. NC®ENR PROJECT NoR CARD- D��NT o� F. ViRONMENT AND NmU RESOURCES SUEUEC T CALCULATION SHEET SHEET I OF —WLU,Wj-Dk WV17d N C-0QUA43) BY DATE 31 ti I gg CHKDBY DATE ell - - VIL.i i ��--lJ. i i � } IF bbUSl 7 At c- -T 7 IT t� SoAt 10E 4-1-4 jtt�lk I-W 4T Q Lwll� is M-M k gc ,4&t -r7r r-,i SOC PRIORITY PROJECT: Yes No_X_ If Yes, SOC No. Date August 27, 1997 Tyrrell County - Permit No. NCO020443 Part I — General information Facility and Address: Town of Columbia 1209 Road Street Ext (103 Main St.) Columbia, NC 27925 2. Date of Investigation: August 26,1997 3. Report Prepared by: Brad Shaver 4. Persons Contacted and Telephone Number: Mr. Carlisle Harrell (Town Manager) Mr. Frankie Armstrong (Operator) 919-796-2781 7u, CEP % I POINT SOURCE BRANCH 5. Directions to Site: Entering Columbia on Hwy. 64 from Plymouth pass over the Scuppernong River, take a left on SR 1209, the treatment plant is approximately one quarter of a mile on the right hand side down a gravel road. 6. Discharge Point(s), List for all discharge points: Latitude:35° 55'13"N Longitude:761 15'22"W Attach a USGS map extract and indicate treatment facility site and discharge point on map. U.S.G.S. Quad No U.S.G.S. Map Columbia west 7. Site size and expansion area consistent with application ? _X— Yes No If No, explain: 8. Topography (relationship to flood plain included): Flat 5 ft above MSL. 9. Location of nearest dwelling: A residence is located 500 yards across the street from the treatment plant. 10. Receiving stream or affected surface waters: Scuppernong River a. Classification: SC b. River Basin and Subbasin No.: 03-01-53 C. Describe receiving stream features and pertinent downstream uses: Fishing, Recreational Boating Part 11— Description of Discharge and Treatment Works a. Volume of Wastewater to be permitted: 0.300 MGD b. What is the current permitted capacity of the Waste Water Treatment facility? 0.300 MGD Actual treatment capacity of the current facility (current design capacity)? 0.300 MGD d. Date(s) and construction activities allowed by previous Authorizations to Construct issued in the previous two years: None e. Please provide a description of existing or substantially constructed wastewater treatment facilities: Influent through Bar Screen and Grit Removal into Oxidation Ditch (biological treatment, 30 Hours detention time) with dual rotors, next dual Secondary Clarifiers to Chlorination and pumping facilities, also Sludge Digestion Tank and Sludge Holding Tank (90 days), finally Dechlorination/Post Aeration Chamber. Please provide a description of proposed wastewater treatment facilities: same as above g. Possible toxic impacts to surface waters: h. Pretreatment Program (POTWs only): in development Approved should be required Not Needed X Residuals handling and utilization/disposal scheme: Presently with the larger sludge holding tank there is no immediate need to haul sludge off -site. As of this report they have not started transferring sludge to the 90 day holding.tank and have been in operation since the first of the year. Their first choice for off site disposal is Atlantic nutrients, their second choice is a company in Plymouth, NC which has a spray field. They will inform this division before sludge is transferred of -site. a. If residuals are being land applied, please specify DEM permit no. Residuals Contractor Telephone No. b. Residuals stabilization: C. Landfill: d. Other disposal/utilization scheme (Specify): 3. Treatment plant classification — - 4. SIC Code(s): 4952 Wastewater Code(s) of actual wastewater, not particular facilities i.e.., non -contact cooling water discharge from a metal plating company would be 14, not 56. Primary _01_ Secondary Main Treatment Unit Code: 100 3 Part III — Other Pertinent information 1. Is this facility being constructed with Construction Grant Funds or are any public monies involved. (municipals only)? YES 2. Special monitoring or limitations (including toxicity) requests: Sample points are located one up- stream, one down -stream, and one at discharge point. (Map included) 3. Important SOC, JOC or Compliance Schedule dates: (Please indicate) Submission of Plans and Specifications Begin Construction Complete Construction 4. , Alternative Analysis Evaluation: Has the facility evaluated all of the non -discharge options available. Please provide regional perspective for each option evaluated. The 201 plan has not changed since the original plant was built and still is appropriate. Spray Irrigation: NPDES Permit Staff Report Version 10192 Page 3 Connection to Regional Sewer System: Subsurface: Other disposal options: 5. Other Special Items: Part IV — Evaluation and Recommendations: It is recommended that the permit be reissued. Using the most current rating form the Town's treatment works have changed from Class II to Class III. Signature of report preparer Water Quality Regional Supervisor Y�h-74? 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' �.� tiF T N tir -M_ _ +Y.• �- r :. r►- � � yam, tiY. •y..- � .` -..... _ ti►-r rt 's;r ..a.: ti•- - •..•-- .�` -...' - tip._ �- - _ - _ �. - _ .....- __ .„ ..._.. ?:a•-... - - _.tit` +-'�`- -'• :� _ ,;,- _ I - �, RATING SCALE FOR CLASSIFICATION OF WATER POLLUTION CONTROL SYSTEMS Name of Facility: Tcv�� 0� ��n� Irk ` �F1srE a41-Ast TLrh- ,MFNr rjAvl Owner or Contact Person: MA. tap-ITsk NM-R-eI-L- Mailing Address: —10; t%4A,N ZS County: -7a P. I-t-f Telephone:_ 917 - 0 79f ; 2:TF I Present Classification: 1i New Facility K -Existing Facility NPDES Per. No. NC00 10993 Nondisc. Per. No.W Health Dept.Per No. Rated by: Telephone: jH-50-4y B1 Date: 9--z7-1 - Reviewed by: Health Dept. Telephone: Regional Office -Telephone:- `9/ 19r 416 Y�'I Central Office ORC:_ L 151-F WA*—t e I-z Grade: Check Classification(s): Subsurface Spray Irrigation Wastewater Classification: (Circle One) 1 II IV Telephone: Telephone: 919-79I, -276/ Land Application Total Points:_ S1-1 ►r'��►1 �� :► : / �►11:.� .ate. ruO►1 �b �■ . .• ►14;r::1 �'11: fit N:i:rid �► ` 1■: ►.* �er� e : a • � 1 1: � 1, '►1 .�: 1■ a : tee. e. _ i.� 1,�► � JI. :.aa 1=,.. der �1►. �► � JI. • SLIBSURFACE CLASSIFICATION (check all units that apply) 1. septic tanks 2. pump tanks 3. siphon or pump -dosing systems 4. sand filters 5. grease trap/interceptor 6 oil/water separates 7_ gravity subsurfacF :reatment and disposal: 8. pressure subsurface treatment and disposal: SPRAY IRRIGATION CLASSIFICATION (check all units that apply) 1— preliminary treatment (definition no. 32 ) 2. lagoons 3. septic tanks 4—pump tanks 5. pumps 6. sand filters 7. grease trap/interceptor 8. oil/water separators 9 disinfection 10. chemical addition for nutrient/algae control 11. spray irrigation of wastewater In addition to the above classifications, pretreatment of wastewater In excess of these components shell be rated using the point rating system and will require an operator with an appropriate duel certification. LAND APPLICATION/RESIDUALS CLASSIFICATION (Applies only to permit holder) 1. Land application of biosolids, residuals or contaminated soils on a designated site. WASTEWA 17ER TREATMENT FACILITY CLASSIF)CAT10N The following systems shall be assigned a Class I classification, unless the flow is of a significant quantity or the technology is unusually complex, to require consideration by the Commission on a case -by -case basis: (Check ff Appropriate) 1. OiVwater Separator Systems consisting only of physical separation, pumps and disposal; 2. Septic TanklSand Filter Systems consisting only of septic tanks, dosing apparatus, pumps,sand filters, disinfection and direct discharge; 3. Lagoon Systems consisting only of preliminary treatment, lagoons, pumps, disinfection, neoessary chemical treatment for algae or nutrient control, and direct discharge;_ 4. Closed -loop Recycle Systems; 5. Groundwater Remediation Systems consisting only of oll/waler separators, pumps, air -stripping, carbon adsorption, disinfection and dispo zJ: 6. Aquacufture operations with discharge to surface waters; 7` Water Plant sludge handling and back -wash water treatment; 8. Seafood processing consisting of screening and disposal. 9. Single-family discharging systems, with the exception of Aerobic Treatment Units, will be classified if permitted after July 1, 1993 br 9 upon inspection by the Division, It is found that the system is not being adequately operated or maintained. Such systems will be notified of the classification or reclassification by the Commission, In writing. The following scale 'is used for rating wastewater treatment facilities: (circle appropriate points) ITEM POINTS ( 1 ) Industrial Pretreatment Unhs or industrial Pretreatment Program (see definition No. 33)...................................................4 (2) DESIGN FLOW OF PLANT IN god [not applicable to non -contaminated cooling waters, sludge handling facilities for water purification plants, totally dosed cycle systems(see definition No. I I� and facilities consisting only of hem (4)(d) or Items (4)(d) and (I1)(d)] 0 - 20,000......................................................................... ..................................................... 1 20,001 - 50.000.......................... »...........................................................»».........._..............................2 60,001 . 100.00................................................................».»...._».».»........_..._..............................a 100,001 - 250,000............................................................................................. ..•---------................. A 250.001 500.000..........»......_».................... .»....... ...... ... .......... ».»....»».»».............................. 500,001 1,000.000.........................................................................».....»»»...»».........._........._.... . A .......................... .......... .. ...... ...... ..... ...... ..... 1.000,001 - 2.000.000.. .. .... ... ...... ..... .... ........ ..... ...............10 2.000.001 (and up) rate i Int additli a for each 200.000 gpd capacity up to a maximum of ............30 Design Flow (gpd) n. D (3) PRELIMINARY (a) UNITSIPROCESSES (see definition No.32) Bar Screens ...... »........ ....... _................... ........... »............................................................................... .1 (b) or Mechanical Screens, Static Screens or Comminuting Devices..._.». _._»_._._._...._._...._._........_._.._....». (c) Grit Removal ..»...... ...................... »......»................................................_............................................. .1 (d) or Mechanical or Aerated Grit Removal ........... »......................... .».................................................................. 2 (e) Flow Measuring Dovice.......................... ....................................................................................................... i (1) or Instrumented Flow Measurement .................... .................. »....................................................................... (9) Preaerallon............. »................................................................................. _............................................. (h) 2 Influent Flow Equalization..........................................................................................................................2 (i) Grease or Oil Separators . Gravity ............................... _..._....»..._........._.............._..._........._..._.............. Mechanical................................................................................................................................................3 Dissolved Air Flotation................................................................................................................................a tl) Prechiorinatlon.............................................•--.........................................................................................5 (4) PRIMARY TREATMENT UNITSIPROCESSES (a) Septic Tank (see definition No. 43).... __........... _.......................................................................................2 (b) Imhoff Tank ........... ... »......................... ......... ............................. ......... »................................................ (c) Primary Clariflers.................................. _.....................................................................................................5 (d) Settling Ponds or Settling Tanks for Inorganic Non -toxic Materials (sludge handling facilities for water purification plants, sand. gravel, clone, and other mining operations except recreational activities such as gem orgold mining)........................................................................................................................................2 (5) SECONDARY TREATMENT LNITSrPROCFSSFS (a) Carbonaceous Stage (i) Aeration -High Purity Oxygen System ...... »........ »..»................. ................................ 20 OfffusedAir System ..................................................... .._..... ...................... .................. 1 0 Mechanical Air System (fixed, floating or rotor)_..._..._..._. Separate Sludge Reiteration............................................................................................3 (II) Trickling Filter HighRate .................................................. :..... ................... ».»...................................... Standard Rate .......................... .............. ... »............................. »..........._..................... .777 PackedTower.............................................................................:..................................5 (IiI) Biological Aerated Fitter or Aerated Biological Fitter__._........».._._.._.__.___.___.__.__.1 0 (Iv) Aerated Lagoons..........................................................................................................10 (v) Rotating Biological Contactors ...................... ............................................................... 10 (VI) Sand Filters -intermittent biological ....................... ............................. _........................... 2 Recirculatingbiological...._..............................................................................................3 (vii) Stabilization Lagoons ........... _....................................................................................... (vili) Clarifier .................................................................................................................... (Ix) Single stage system for combined carbonaceous removal of BOD and nitrogenous removal nitrification (see definiion No. 12)(Points for Ihrs hem have to be In addition to hems (6)(a)(1) through (5)(a)(viil). utilizing the extended aeration process (see definition No.3a) ........................................ 157116-- utilizing other than the exlsnded aeration process.......»».....»....._».�.....».....»..»_._... (x) Nutrient additions to enhance BOD removal......................................................................5 (x1) Biological Culture ('Super Bugs')addition........................................................................5 (b) Nitrogenous Stage (I] Aeration - High Purity Oxygen System ............................................... _...._...._..20 DiffusedAir System.......................................................................................................10 Mechanical Air System (fixed, floating or rotor) ........................... ................................ SeparateSludge Reaeration.................................. ........................... .............................. 3 (Il} Trickling Fllter•Hlgh Rate ............................. ................................... _................................ 7 Standard Rate................................................................................................................6 PackedTower .................... »........................................................................................... (Ili) Biological Aerated Filter or Aerated Biological Filter ----------------------------------------- 10 (Iv) Rotating Biological Contactors......................................................................................10 (v) Sand FFiher. Imenntnent biological .............................................. »... .............................. 2 Recirculating biological ....................... ,................... ........................................ I ............... 2 (VI) Clarifier ............................... ..................................... ... _........... ................................... (6) TERTWWORADVANCEDTREAiMWTLNfiS FK)CESSFS (a) Activated Carbon Beds - without carbon regeneration ._ ..................... ..................... »»»....»»................................. .5 withcarbon regeneration ................ „.................................. ..».»...._.».».».».........................i s (b) Powdered or Granular Activated Carbon Feed - withoutcarbon regeneration ................. _................................ ».»...»..................................... with carbon regeneration ...... »».»... ».................................. ».»........... ..... ........................... 15 Air stripping.....»»....».5 (c) (d) .......................................................................................................................... Denhnffkatlon Process ............ _................................................................................................................10 (s) Eleclrodlalysis...... ».».»........»..................... »............ .»....................... ............ .... ........... .......................5 (1) Foam Separatlon................ ................................. ............ ................ ..... .....»........»_.. ».......5 (g) Ion Exchange...................................................................................:............................»....................».5 (h) Lard Application of Treated Effluent (see definition No. 22b) (not applicable for sand, gravel, stone and other similar rrJning operations) by high rate kliitratlon._..._..._„__..._..._..._..._......»...._...�.._..._...4 (I) ()) Microscreens .......... ............................... ........_.....................»....................»_.......................5 Phosphorous Removal by Biological Processes (See definition No. 26)...................................... .... _........... 20 (k) Polishing Ponds - without aeration ............... _....................................................... » ............................ _.... 2 withaeration ......... .»»----- »_.»».»................................. ... ................ .................. (1) Post Aeration - cascade........................................................................................................................... diffused or mechanical .......................... -_....................................................... .................. 2 ' (m) smosis............................................ Reverse Osmosis..". ....... ...... ****'**'** ......... ....... (n) Sand or Mixed -Media Fitters - low rate ......................_ .... „........._-----.............._....................._................... 2 highrate......................................................................5 (o) Treatment processes for removal of metal or cyanide...................................................................................1 5 (p) treatment processes for removal of toxic materials other than metal or ry:Hide....._........ .__..._._.....„.„„....15 (7) SI.L OG E TREATMENT (a) Sludge Digestion Tank - Heated (anaerobic) ...... .................. _........ _....... .,................ ......... ...................... 10 Aerobic... ............. ...................................................»........................................................................54 Unheated(anaerobic)........................................................................................................ 3 ....................... (b) Sludge Slabillzatlon (chemical or ihermal)...................................................................................................5 (c) Sludge Drying Beds - Gravity......................................................................................................................2 VacuumAssisted......................................................................................................................................5 (d) Sludge Eluiriation.....................................................................................................................................5 (e) Sludge Conditioner (chemical or thermal) ....... ................ ».....».............................................._..................5 (I) Sludge Thickener (gravity).........................................................................................................................5 ( g ) Dissolved Air Flotation Unit (not applicable to a unh rated as(3)(i)).............................................................8 (h) (1) Sludge Gas Utilization (including gas storage) ............................................... ..................................... Sludge Holding Tank - Aerated .................... J Nor,-aerated.............................................................................................................................................2 ()) Sludge Incinerator (not Including activated carbon regeneration)................................................................10 (k) Vacuum Fher, Centrifuge, or Filter Press or other similar dewaterinp devices.._..»....» „..._„..» ___._____...10 (a) RESIDUALS UTILIZATIOWDISPOSAL (including incinerated ash) (a) Lagoons..................................................................................................................................................2 (b) Land Application (surface and subsurface) (see definition 22a) by contrasting to a land application operator or landfill operator who holds the land application permit or landfill permit......................................................................................................................................A@ (c) Dedicated Landfill(burial) by the permhiee of the wastewater treatment facility ......................... _............ ....... (9) DiSWECTION (a) Chlorination............................................................................................................................................ (b) Dechlorination...................................................................................................................................... 5 (c) Ozone..................................................................................................................................................... (d) Radiation.................................................................................................................................................5 (1 0) CHEMICAL ADDITION SYSTEM(S) ( see definition No. 9) [not applicable to chemical addhions rated as hem (3)(I), (5)(a)(xl), (6)(a), (6)(b), (7)(b). (7)(e). (9a), (9)(b) or (9)(c) 5 points each: List.......... ....................... _...................................................................................................5 ...................................................................................................................................... .5 ................................................................................................................................... 5 .......................................................................................................................5 (1 1) M1SCEU.ANECUS UfdriVPROCESSES (a) Holding Ponds, Holding Tanks or Settling Ponds for Organic or Toxic Materials Including wastes from mining operations containing nitrogen or phosphorus compounds In amounts significantly greater than is common fordomestic wastewater............................................................................................................................4 (b) Effluent Flow Equalization (rot applicable to storage basins which are inherent In land application systems).....2 (c) (d) Stage Discharge (not applicable to storage basins inherent In land application systems) ...... -__.-._-..„._„.. Pumps............................................................................................................................ (e) Stand -By Power Supply........................................................................................................................ (I) Thermal Pollution Control Device..............................................................................................:.............� TOTALPOINTS .......................... ................................................ �{ �-F_ CLASSIFICATION ClassI...........................................................................................................5.25 Points Class11.........................................................................................................26-50 Points ClassIII........................................................................................................51-65 Points ------------------------------------------------------------- ClassIV ................................................... ....................................................66-Up Points Facilities having a rating of one through four points, Inclusive, do not require a certified operator. Facilities having an activated sludge process will be assigned a minimum classification of Class II. Facilities having treatment processes for the removal of metal or cyanide will be assigned a minimum classification of Class II, Facilities having treatment processes for the biological removal of phosphorus will be assigned a minimum ciassF"lion of Class III, ----------- __--_---------------------------------------- MU DEFNf TIONS The following definitions shall apply throughout this Subchapter, (1) Activated Carbon Beds. A physicallchemical method for reducing soluble organic material from wastewater effluent; The column -type beds used In this method will have a flow rate varying from two to eight gallons per minute per square foot and may be shher upllow or downflow carbon beds. Carbon may or may not be regenerated on the wastewater treatment plant she; (2) Aerated Lagoons. A basin in which all soPds are maintained In suspension and by which biological oxidation or organic matter is reduced through artificially accelerated transfer of oxygen on a flow -through basis; (3) Aeration. A process of bringing about Intimate contact between air or high purtty oxygen In a liquid by spraying, agitation or dlffuslon;(3a) Extended Aeration. An activated sludge process utilizing a minimum hydraulic detention time of 18 hours. (4) Agriculturally managed she. Any she on which a crop is produced, managed, and harvested (Crop Includes grasses, gralrts, trees, sic.); (5) Air Stripping. A process by which the ammonium Ion Is first convened to dissolved ammonia (pH adjustment) with the ammonia then released to the atmosphere by physical means; or other similar processes which remove petroleum products such as benzene, toluene, and xylene; (6) Carbon Regeneration. The regeneration of exhausted carbon by the use of a furnace to provide extremely high temperatures which volatilize and oxidize the absorbed Impurhles; (7) Carbonaceous Stage. A sbge of wastewater treatment designed to achieve "secondary' effluent Iimlls: (8) Centrifuge. A mechanical device In which centrifugal force Is used to separate solids from liquids or to separate Squids of different densh,as; (9) Chemical Addition Systems- The addition of chemical(s) to wastewater at an application point for purposes of Improving solids removal, pH adjustment, alkalinity control, etc.; the capability to experiment with different chemicals and different application points to achieve a specific result will be considered one system; the capability to add chemicals) to dual units will be rated as ona system; capability to add a chemical at a different application points for different purposes will result In the systems being rated as separate systems; (10) Chemical Sludge Conditioning. The addhion of a chemical compound such as Ilme, ferric chloride, cc a polymer to wet sludge to coalesce the mass prior to Its application to a dewatering device; (11) Closed Cycle Systems. Use of holding ponds or holding tanks for containment of wastewater containing Inorganic• non -toxic materials from sand, gravel, crushed store or other similar operations. Such systems shall carry a maximum of two points regardless of pumping facilities or any other appurtenances; (12) Combined Removal of Carbonaceous BOO and Nitrogenous Removal by Nitrification- A single stage system required to achieve pemth effluent limits on BOD and ammonia nitrogen within the same biological reactor, (13) Dechlorinatlon. The partial or complete reduction of residual chlorine In a liquid by any cherttical or physical process; (14) Donhrriicatlon Process. The conversion of nitrate -nitrogen to nitrogen gas; (15) Etecirodialysls. Process for removing Ionized sags from water through the use of lon-salective ion -exchange mombrartas; E,) Flier' Press. A process operated mochartically for partially dowataring sludge; (17) Foam Separation. The planned frothing of wastawater or wastewater effluent But a moans of removing excossive amounts of detwilors materials through the introduction of air In the torn of line bubbles; also called loam fractionation; (18) Goa Removal. The process of removing grill and other heavy mineral muter from wastewater; (19) l tiolf Tank. A deep two story wastewater tank consisting of an upper sedimentation chamber and a lower sludge digestion chamber, (20) Irwrumented Flow Measurement. A device which Indicates end records rate o1 flow; (21) ion Exchange. A chemical process in which ions from two different molecules are exchanged; (22) Land application. (a) Sludge Disposal. A Onal sludge disposal method by which wet sludge may be applied to land either by spraying on the surlace or by subsurface Injoclion 0.e, chisel plow); [not applicable for types of sludge described In (i I) of this Rule); (b) Treated Effluent. The process of spraying treated wastewator onto a card area or other methods of application of wasrewaler orto a land area as a means of final disposal or Irealmart; (23) Wcrosrroom A low speed, continuously back -washed, rotating drum finer operating under gravity conditions as a polishing rnothod for removing suspended solids from otfluers; (24) hrrtrilkwien Process. The biochemical eorrversion of unoxidlzed nitrogen (ammonia and organic nitrogen) to oxidized nitrogen (usually nitrate); (25) i:4rogenous Stage. A separate stage of waslowalor treatment designed tot the specific purpose of converting ammonia nitrogen to nitrate nitrogen; (26) Pltosghraie Removal, Biological. The removal of phosphorus from wastewater by an oxidanoxic process designed to enhance luxury uptake of phosphorus by the microorganisms; (27) Polishing Pond. A hoidng pond following secondary treatment with sufficient detention tlme 10 allow sealing of finely suspended solids; (28) Post Aeratlom- Aeration following conventional secondary Ireatmert units to Increase effluent D.O. or for any otter purpose; (29) Post Aeration. (Cascade) A polishing method by which dissolved oxygen Is added to the offluanr by a nonmechhanical, gravity means of (lowing down a series d steps or weirs; The flow occurring across the slaps or weirs moves in a fairly thin layer and the operation of the cascade requires no operator adjustment; thus, zero points era assigned even though this Is an essential step to meeting the limits of the discharge permit; (30) Powdered to Granular Activated Carbon Feed. A biophysical carbon process that utilizes biological activity and organic absorptlon by using powdered or granular acttvatod carbun; Virgin or regereraled carbon k feed controlled Into the system; (31) Preaeration. A tank constructed ID provide aeration prior to primary trealmonl; (32) Preliminary Units. Unit operations In the trealmert process, such as screening and comminution, that prepare the Liquor for subsequent major operations; (33) trdvstrial Pretreatment. (a) Pre-treatment Unit, Industrial. The conditioning of a waste at its source before discharge, to remove or to neutralize substances Injurious to sewers and tro=rnors processes or to affect a partial reduction In load on the treatment process which is operated by the same governing body as the wastewaler treatment plant being rated; b) F:o-lreasment Program, Industrla! - nusl be a Slate or EPA required program to receive paints on the rating sheet; (34) Prmary Clarifiers. The first settling tanks through which wastewater is passed In a treatment works for the purpose of removing settleable and suspended solids trod BOD which Is associated with the solids; (35) P,rmps. All lnlluerhl, effluent and In-plart pumps; (36) Ra'imion. Disinfection or sienlizalion process utilizing devices emitting uArtvlolot or gamma rays; (37) Reverse Osmosis. A traatmert process In which a heavy contarninaled liquid Is pressurized through a membrane lorming nearly pure liquid free from suspere-ed solids; (38) Rctaling Biological Contractors. A fixed biological growth process in which wastewater flows through tanks In which a series of partially subrtergoci circular surfaces are rotatoa. (39) Surd Fillers: 1a) Infermfinerit Biological. Filtration of effluent lollowing septic tanks, lagoons, or some other treatment process In which further biodocompos4ion is expected to produce desired etlluonts; Hydraulic loading rates on these liners are computed In gpdrac and have a resulting low gprrVal (less Ilan one); b) Ra rcvtating biological - the same type of sand liner u defined In Subparagraph (39) (a) of this Rule with the added capability to recycle offluorn back through the sand liner, (40) Sznd or Mixed -Media Filters. A polishing process by which effluart llmhs are achieved through a further reduction of suspended solids; (a) low rate — gravity, hydraulically loaded finer whh loading rates In the one to three gprrvsl range; (b) high rate -- a pressure, hydraulically loaded finer with loading rates in the live gprrVci range; At any rate, the loading rate will exceed three gprNd; (41) Secondary Clarifiers. A tank which follows the biological unit of treatment plant and whirl, has the purpose of removing sludges usociated with the biological treatment units: (42) Separate Sludge Reaeradion- A pan of the contact stablllzalion process where the activated sludge Is transferrad to a tank and aerated before returning it to the contact basin; (43) Septic Tank A Ongle•siory setlling tank in which settled sludge Is In contact with the wastewater flowing through the tank; shall not be applicable for septic tank systems serving single family residences having capacity of 2,000 gallons or leas which discharge to a rihrificalion field; (44) SF•dge Digestion, The process by which organic or volatile mailer and sludge is gasified, liquefied, mineralized or convened into more stable organic matter through the atthvlry of living organisms, which Includes aerated holding tanks; (45) Sicdge Drying Beds. An area comprising natural or artificial layers of porous malortais upon which digested sewage sludge Is dried by drainage and evaporation; (a61 Sludge Elutrtatlon. A process of sludge conditioning In which cenain corsilluerts are removed by successive washings with fresh crater or plant effluent; (47) Sl:dgo Gas Ullization The process of using sewage gas for the purpose of heating buildings, driving engines, sic.; (48) Sl:,dge Holding Tank (Aormed and Nonaeraled). A tank tnlllzed for small waStowaler treatment plants nol containing a digester In which sludge may be kept fresh, and supernatant wilhhdrawn prior to a drying method (I.e. sludge drying beds); This may be done by adding a small amount of air gimpy to keep the sludge fresh, but not necessarily an amount that would be rogvlred to achieve stabilization of organic matter. A nonaoralad tank would simply be used to decant sludge prior to dewaiering and would not allow long periods (several days of detention) without resulting odor problems; (49) SI•adge Incinerators. A fumace designed to bum sludge and to remove a] moisture and combustible materials and reduce the sludge to a storile ash; (50) Sludge Stabilization (Chemical or Thermal). A process to make treated sludge less odorous and putrescitcle, and to reduce the pathogenic organism content; This may be done by pH adjustment, chlorine dosing, or by heal lrsalmont; (51) Sludge Thickener. A type o1 sedimertatlon tank In which the sludge Is permitted to settle and thicken through agitation and gravity; (52) Stabilization Lagoon A type of oxidaion lagoon In which biological oxidation of organic marten Is etfoctod by natural irarWer of oxygen to the water from air (nos a polishing pond); (53) Siand-By Power Supply. On she or portable electrical generating equipment; (54) Static Screens. A stationary &croon designed to remove solids. Including rhorrblodegradable, particulate (iloatable solids, suspended solids and SOD reductive) from municipal and Industrial wastewater Irtutment systems; (55) Tertiary Treatment. A stage of treatment following secondary which Is primarily for the purpose of effluent polishing; A settling lagoon or sand or coal Iftior might be employed for this purpose; (56) Thermal Panution Control Device. A dovlee providing for the transfer of head from a fluid flowing In tubes to another fluid outside the tubes, or vice vorsa; or other moans of regulating liquid terrperalures; (57) Thermal Sludge Conditioner. A conditioning process by which heal its added for a protracted period of flme to Improve the dewatorablllty of shtrdge by the solubilt;ng and hydraullzing of the smaller and more highly hydrated sludge panicles; (58) Toxic Materials. Those wastes or combinations of wastes, Including disease -causing agents which after discharge and upon exposure, Ingestion, Inhalation or asslrwUllon Into arty organism, either directly from the ♦nvironnhent or indirectly by ingestion through food chains, will cause death, disease, bahaviond abnormalities, cancer, genetic mutatlons, physiological malfunctions (Including maltunctiona In reproduction) or physical defortndlons, in such organisms er their osfspring; Toxic materials Include, by way of Iiluslrptlon and not Ilmhallow lead, cadmium, chromium, mercury, vanadium, arsenic, zinc, ortho-riltro-chlorobanzene (ONCE), polychlortnated t>fphenyls (PCBs) and dfchloradiphanyl trichloroathane (DDT); arrd any other materials that have or may heroaher be determined to have toxic properties; (59) Trickling Filter. A blologlral treatment unit consisting of a malartal such as broken store or rock over which wastewater is distrtbulod; A high rate trickling riper Is one which operated as between 10 and 30 mgd per acre. A low rate trickling finer Is one which Is desJgnod to operate at one to four mgd par acre; (so) Trickling Filter (Packed Tower). A plug flow type of operation In which wastewater flows down through successive Layers of media or litttale material; Organic material Is rornc ved continually by the active biological fixed growth In each suemsslvo layer. This method may produce -setcndary- quality diluent, a may be adapted to produce a nitrified stiiuent; (6i) Vai"vm Filler, Centrllvges, or Finer Presses. Devices which an designed to remove excess water from ether digested or undigosted sludge prior to disposal or further treatment. Facility Notes for Columbia WWTP (NC0020443) MEMORANDUM TO: File FROM: Jeff Myhra DATE: March 3, 1997 SUBJECT: Permit file review for Columbia WWTP (NC0020443) Facility In_form_ation: Qw = 0.3 MGD (Class III facility) Scuppernong River 03-01-53 Stream Class: Scuppernong River SC 4-6-61 30-14-4-(9) • ATC was issued to the facility on 11-20-95 to expand the existing facility to 0.3 MGD. • Treatment plant class has changed from Class II to Class III on 09-10-97 (effluent monitoring sheets were changed as required). • Staff report was prepared by Brad Shaver. Treatment works consists of: Influent through bar screen and grit removal into oxidation ditch (biological treatment, 30 hours detention time) with dual rotors, next dual secondary clarifiers to chlorination and pumping facilities, also sludge digestion tank and sludge holding tank (90 days), finally dechlorination/post aeration chamber. Region recommends that the permit be issued. • WLA prepared 7-7-95. The previous WLA for this facility for Q, = 0.225 MGD recommended BPJ limits of BOD5/NH3 = 15/4 and DO = 6.0 mg/l in order to minimize the discharger's contribution to an existing water quality problem ((in 1994 the 305-B report @ NCSR 1105 (6 miles upstream of Columbia) was listed as non -supporting due to low DO levels)). The same limits were used to develop the WLA for the upgrade to 0.3 MGD. NH3N and whole effluent toxicity: It is expected that with an estimated 20 CFS of freshwater input to this system, that mixing and dilution are extensive enough that the 4.0 mg/l NH3N limit will be fully adequate to prevent ammonia toxicity from occurring instream. No WET testing was recommended since the facility is a minor, 100 percent domestic discharge with no risk of ammonia toxicity. A residual chlorine limit of 28 µg/l was applied as per current SOP. No other toxicants were suspected in the discharge. Notes for Columbia WWTP (NC0020443) Page 2 of 2 • DMR Data: TSS Violation April 1997 (36.9 mg/1) Fecal Coliform Violation April 1997 (384.9 #/100rn1) Fecal Coiiform Violation February 1997 (506.9 #/100ml) Fecal Coliform Violation Dece er 1996 (283.8 #/100m1) TSS Violation August 1995 (6p mg/l) • No special basinwide management strategies apply. The use support rating for Scuppernong River is Partially supporting. The following information in relation to the Scupopernong River is included in the Basin plan: Biological and ambient chemistry data indicate that water quality is depressed. Both point and non -point sources of pollution are thought to be contributing to the problem. The NPS team should consider targeting this area and DWQ will investigate the potential of impairment from the WWTP.