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Home My WebLink AboutNC0026051_Correspondence_19901008State of North Carolina Department of Environment, Health, and Natural Resources Division of Environmental Management 512 North Salisbury Street • Raleigh, North Carolina 27611 James G. Martin, Governor George T. Everett, Ph.D. William W. Cobey, Jr., Secretary Director October 8, 1990 Mr. Doug Cullinane, County Engineer County of Durham 120 East Parrish Street Durham, NC 27701 Subject: Metal Limits for the Triangle WWTP (NPDES No. NC0026051, Durham County) Dear Mr. Cullinane: At the September 25, 1990, meeting between yourself, Hazen & Sawyer, and representatives of DEM, you indicated that the Durham Triangle WWTP would like the metals limits contained in its NPDES permit to be changed from only daily maximum limits to weekly average and daily maximum limits. Technical Support has evaluated this request and determined the following limits are necessary to protect the North Carolina water quality standards in Northeast Creek: Weekly Daily Average Maximum Cadmium 2 ug/1 5 ug/1 Chromium 50 ug/1 200 ug/1 Nickel 88 ug/1 352 ug/1 Lead 25 ug/1 34 ug/1 Cyanide 5 ug/1 15 ug/1 Mercury 0.012 ug/1 0.048 ug/1 These limits will require daily effluent monitoring (i.e., Monday -Friday) for each parameter, and the weekly average will be the arithmetic mean of the five daily samples. If the weekly average limit is met by the first of the samples, the rest of the daily samples need not be analyzed, but if the first sample is out of compliance with the weekly average limit, all five daily samples should be reported. The weekly average limits are established to protect against chronic toxicity instream, while the daily maximum limits are necessary to protect against acute effects in the mixing zone. The lowest achievable analytical detection level for each of these parameters will be required in the permit to assure the best results. Pollution Prevention Pays P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone 919-733-7015 An Equal Opportunity Affirmative Action Employer r If the above limits are acceptable and you are interested in having the NPDES permit modified to include them, a written request to that effect should be sent to Don Safrit of DEM's Permits and Engineering Unit. If you have any questions or comments in regard to the proposed limits feel free to contact me at (919) 733-5083. evor Clements, Asst. Chief W er Quality Section cc: Don Safrit Raleigh Regional Office Ken Eagleson Central Files Pollution Prevention Pays P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone 919-733-7015 An Equal Opportunity Affirmative Action Employer C(rtfM,uM tAteicijjyt_ rc,„, - `1 44 -(DL dr '411' 7 Z 5 (c Z) - (to ' a use 5'VII I so (s " So) - (so) : oo ,� gg "WI (5. % - qt = '351-` 25 311 (sw 25) - 25 ° Io0 Nsc i -s. 7/I 5 31 O*s) — to =niS1 0.Or2. 7,11 (au Pc) - ,l , � •0'f ost O.oy$ 4,/t wacky � i«& joA. 5 dr^: (7 ((A S }�[a� dtkdi l a/1 It ✓t l t o ��S aii Zero . I IU��tCy M yS (wet(i Avt(.c3t an� �yl� M/lX) art ciPI, 64Io�% ce4cC.r` , (, I t / f. J , 5; -\ Lt. af H , ^) Le (o ✓ jvie (Ka,. AI Cownle i come+cap+ ) D#,c` y rtkx rAc+ f•-s b,.ke Or\ * .011) .ocZ , State of North Carolina Department of Environment, Health, and Natural Resources Division of Environmental Management 512 North Salisbury Street • Raleigh, North Carolina 27611 James G. Martin, Governor George T. Evetett, Ph.D. William W. Cobey, Jr., Secretary vDit+ector October 1, 1990 Mr. Doug Cullinane, County Engineer County of Durham 120 East Parrish Street Durham, North Carolina 27701 chi %• $v OCi 0 5 1990 Subject NPDES Permit No. NC0026051 1 Triangle Wastewater Treatment Facility Durham County Dear Mr. Cullinane: Thank you for meeting with staff members of the Division of Environmental Management on September 25, 1990, to discuss the County's concerns regarding the NPDES Permit which was issued on July 20, 1990. As agreed, the County and their consulting firm, Hazen and Sawyer, will provide a plan for the collection of sampling data and assimilation of pretreatment and engineering information for the justification of a compliance schedule to be incorporated into the subject NPDES Permit. This information is to be submitted to the Division on or before October 16, 1990. Once these items have been reviewed by the Division of Environmental Management, we will proceed to prepare the appropriate permit modification or an explanation of why we feel these requirements are necessary. Another meeting can be scheduled after this review, if appropriate. If you have any questions, please do not hesitate to : • act me at 919/733-5083. ely, al Supervisor, Pe cc: Raleigh Regional Office Office of General Counsel, Leigh Stallings .Technical Support Brands Environmental Sciences Branch Hazen and Sawyer • gineering Unit Pollution Prevention Pays P.O. Box 27687. Raleigh. North Carolina 27611-7687 Telephone 919-733-7015 An Equal Opportunity Affirmative Action Employer DIVISION OF ENVIRONMENTAL. MANAGEMENT MEMORANDUM To= From= Subject: Name September 26, 1990 Durham County Triangle WWTP WLA File Trevor Clements 9/25/90 Meeting Regarding Settlement of NPDES Permit Adjudication Trevor Clements Dale Overcash Doug Cullinane Rick Niers Jim Cramer Gordon Ruggles Matt Mathews Mike Scoville Don Safrit Attendees Representing DEM - Technical Support DEM - Permits & Engineering Durham County DEM - Raleigh R. 0. Hazen & Sawyer Hazen & Sawyer DEM - Aquatic Toxicology DEM - Technical Support DEM - Permits & Engineering Meeting Summary Phone 733-5083 733-5083 560-7999 733-2314 833-7152 833-7152 733-2136 733-5083 733-5083 Representatives of the County requested an explanation of the effluent limitations that were added or revised in their recent permit renewal. DEM staff explained that chemical specific toxic limitations and monitoring requirements were based upon meeting State water quality standards for toxic constituents known to be present in the County's effluent. Changes in the summer total phosphorus, BOD5, NH3N, and DO limits were based upon documented instream water quality problems. Effluent and instream data were summarized and compared with water quality standards. The County representatives requested a 24 month delay in implementation of the new or revised limitations in order for them to establish a better database and to improve their internal controls on industrial sources. It was pointed out to the County that they had been monitoring for these substances for several years, and the data indicated very few violations within the past twelve months. In addition, the new permit does not go into effect until March 1, 1991. DEM staff asked for the County to provide a more detailed description on why the County would need additional time. It was acknowledged by DEM that compliance with the revised summer TP limit should not be required by the permit's effective date. An inquiry was made regarding modification of the permit to include weekly average as well as daily maximum toxic limitations, so that the current daily maximum limits could be slightly relaxed. Technical Support agreed to provide the County with a speculative set of limits under this scenario for their consideration. The County will submit a plan to DEM within 2 weeks outlining how they intend to gather the necessary information and make decisions regarding the amount of time required for implementation of the new requirements. DEM, in turn, will review this information and determine whether to request the office of General Counsel to pursue a continuation from the administrative law judge to provide time for further settlement discussions. JTC/am CC Steve Tedder Don Safrit Tim Donnelly L ee-4- W 1 rY 1 r c J� V Iai ` Couvti W 11 1 b i)er _' -t± r1, ?,e...._.(2._.___,_______._n `�fe.,x>- C(evn EH- T 44fti,t--133--5-0a.3 �Aa.E. a ut. * ()E./A - Pito«.:i3 i r Gov Cr Call 1 ••! 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