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Home My WebLink AboutNC0021181_SPECULATIVE LIMITS_19911018 NPDES DOCUWENT SCANNINO COVER SHEET NPDES Permit: NCO021181 Belmont WWTP Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Engineering Alternatives Analysis 201 Facilities Plan Instream Assessment (67B) Speculative Limits Permit History Document Date: October 18, 1991 This document is printed oa reuse paper-ignore any cozzteat on the resrerse side DIVISION OF ENVIRONMENTAL MANAGEMENT October 18, 1991 MEMORANDUM TO: Dale Overcash ,I FROM: Jacquelyn M. Nowell THRU: Ruth Swanek Qc� Carla Sanderson" SUBJECT: Additional Comments on Belmont WWTP NPDES Permit No. NC0021181 Gaston County The Technical Support Branch has received comments from the Mooresville Regional Office (MRO) in reference to my September 13th memo on the subject facil- ity. We concur with the MRO recommendation for inclusion of effluent sampling for total nitrogen and total phosphorus upon renewal. We will evaluate at the permit renewal whether to assign metals limits based upon protection against acute toxic- ity. The support of the MRO for more stringent limitations will be a factor con- sidered. If there are any questions concerning this matter, please contact me. Attachment cc: Rex Gleason WI:A Filet city of belmont AMMONIA ANALYSIS 7Q10 : 95 . 0000 cfs NH3 Eff1 . Conc: 0 . 0000 mg/l AL (1/1 . 8 mg/1) : 1000 . 00 ug/l Upstream NH3 Conc. : 220 . 0000 ug/l Design Flow: 5 . 0000 MGD Predicted NH3 Downstream: 203 . 41 ug/1 0 . 203406 mg/1 NH3 Limit : 10561 .29 ug/1 10 . 56129 mg/l AMMONIA ANALYSIS (WINTER) 7Q10 : 95 . 0000 cfs NH3 Effl . Conc: 0 . 0000 mg/l AL (1/1 . 8 mg/1) : 1800 . 00 ug/l Upstream NH3 Conc. : 220 . 0000 ug/l Design Flow: 5 . 0000 MGD Predicted NH3 Downstream: 203 . 41 ug/l 0 . 203406 mg/l NH3 Limit : 21167 . 74 ug/l 21 . 16774 mg/l DIVISION OF ENVIRONMENTAL MANAGEMENT October 4, 1991 MEMORANDUM TO: Jacquelyn Nowell &, FROM: D. Rex Gleason 4 SUBJECT: City of Belmont WWTP NPDES Permit No. NC 0021181 Gaston County, North Carolina Appropriate staff have reviewed your memo dated September 13 , 1991 to Dale Overcash regarding the subject matter. The following comments are offered: 1. Include effluent sampling for N & P as is required for other discharges to Lake Wylie. 2 . The proposed daily maximum limits for metals and CN are indeed high. Recommend protection against acute toxicity as you suggested. If you have questions regarding these comments, please advise. DRG: se VED 0 C T 0 8 1991 i.li <iS;A.L SUPPORT BRANCH II F J SEP 05 191 16:28 PSI CHARLOTTE OFFICE P. 1/3 DATE: stpT 5� 1�g1 TIME: PROJECT NO.: I Q-O l�e - Z-10 PLEASE DELIVER THE FOLLOWING PAGES TO: NAME: COMPANY: 6-kl( JLrKrQ G IA J Cr ADDRESS: D\.J. MAL)AGb`Mb%X CITY/STATE: (LAL-O lr%3 -� C_ . TELECOPIER NUMBER: 1 'q\q - -7 3 °1 t 01 FROM: NAME: �"1Lfz'4 lkA-rMj+ PROFESSIONAL SERVICES, INC. 6715 FAIRVIEW ROAD, SUITE D CHARLOTTE, NORTH CAROLINA 2821.0 TELECOPIER NUMBER: (704) 365-4632 WE ARE TRANSMITTING 3 PAGES (INCLUDING THIS COVER SHEET). IF TRANSMISSION IS NOT COMPLETE, PLEASE CALL. OPERATOR'S NAME: cscA TELEPHONE NUMBER:. (704) 365-4680 . COMMENTS: J!k � O�Y� k�)SC�.SS )4hLi /tZTA-cI-F l.S(r O�.�2 l��TfbV2 70 `tom Fs+t AL4.v. 2 9 91 SEP 05 ,'91 16:28 PSI CHRRLOTTE OFFICE F)L 6'P.2/3 1" 51 August 2, 1991 Mr. Don Safrit Supervisor Permits & Engineering Unit Water Quality Section Division of Environmental Management P.O. Box 29535 Raleigh, NC 27626 Re.: City of Belmont WWTP NPDES Permit No. NCO021181 Dear Mr. Safrit: The City of Belmont is currently constructing a new effluent outfal,l for their wastewater treatment plant, extending the discharge point to the main channel of the Catawba River (Lake Wylie) as required by their NPDES permit and special Order of Consent EMC WQ No. 88-23 Ad I. This construction is expected to be completed prior to the September 1, 1991 deadline established in the SOC. Funding is being provided through the State Revolving Fund low interest loan program. In addition to the outfall extension, the City is undertaking extensive modifications and upgrading of the screening, aeration, and sludge handling facilities at the plant. Now in the design phase, construction is scheduled to begin in April, 1992 with the work completed by June 1, 1993 . These improvements are also funded through the SRF, and all design and review activities are being coordinated through the Construction Grants and Loans Section. NPDES Permit No. NCO021181 will expire at midnight on July 29, 1993 with the renewal process beginning before construction is completed. It is our desire to include plant improvements which not only provide for the treatment of wastewater to the current discharge 'limits, but will also meet any new requirements imposed at permit renewal. PROFESSIONAL SERVICES,INC. 6716 Fairview Road,Suite 0•Charlotte,North Carolina 28210 (704)365.4680-FAX(704)365.4682 SEP 05 '91 16:29 PSI CHPRLOTTE OFFICE P.3/3 . 2 It is for this reason that we request a determination as to what changes in the discharge limits, if any, may be expected upon permit renewal. At this time, no increase in capacity is planned, however, over the next five years, we believe flows will progressively grow toward the plants 5.0 MGO rated capacity. Should you have any questions or comments, please feel free to call. Sincerely, PROFESSIONAL SERVICES, Inc. .Gerald E. Hatton, P.E. cc: Mitchell B. Moore, City Manager John R. Blowe, Construction Grants Section Rex .Gleason, Mooresville Regional office 10-016-210 DIVISION OF ENVIRONMENTAL MANAGEMENT September 13, 1991 MEMORANDUM TO: Dale Overcash \ FROM: Jacqu"elyn:!I.�Nowell.��,(�\I\� THRU: Trevor Clements Ruth Swanek PC5 Carla Sanderson SUBJECT: City of Belmont WWTP NPDES Permit No. NC0021181 Gaston County The Technical Support Branch has reviewed the August 2nd letter from Mr. Gerald E. Hatton concerning effluent limits for the subject facility upon permit renewal. The speculative nature of this analysis must be emphasized because of its completion without review or comments from the staff of our Mooresville Regional Office. Upon their review, additional information could be provided that was not input during this analysis. The last wasteload allocation for Belmont was completed in March 1988. An instream assessment was done in August 1988 for the Special Order by Consent that the facility is currently under. Based on the information available, the Technical Support Branch developed effluent limits at the wastellow of 5.0 MGD. Our modeling analysis indicates the following limits for conventional constituents will be acceptable: BODS 30 mg/1 TSS 30 mg/1 Fecal Coliform 200/100ml pH 6-9 SU Tentative effluent limits were also developed for metals. The recommended daily maximum limits based this preliminary information are: Cadmium 27 ug/1 Chromium 663 ug/l Cyanide 66 ug/l Mercury 0.16 ug/l However, consideration of protecting against acute toxicity in the mixing zone (i.e. where effluent meets the receiving water) may result in more stringent limits, particularly for cadmium and cyanide. Monthly effluent monitoring requirements will also be included for copper, nickel, lead, zinc, and silver. The instream waste concentration (IWC) at 5.0 MGD is 88 and a chronic toxicity testing requirement will apply, with sampling in the months of February, May, August, and November. As you are aware, the Water Quality Section is currently implementing a basinwide water quality management initiative. Our schedule for implementation in the Catawba River Basin begins in 1995. The plan will address all sources of point and nonpoint pollutants. In addressing interaction of sources, wasteload alloca- tions may be affected. As a discharger to the upper reaches of Lake Wylie, this section of the Catawba River will be reviewed for nutrient reductions. Although no management decisions have been made, nutrient limitations on point sources are considered a possibility. Belmont should design its facility, such that biologi- cal nutrient removal can be achieved and chemical polishing can easily be added. North Carolina has recently adopted an action level for total residual chlo- rine (TRC) of 17 ug/l to protect against chronic toxicity to aquatic life under low flow conditions. An effluent TRC limit of 28 ug/l (which protects against acute effects) will be applied to the Belmont facility once the facility is upgraded. The process of chlorination-dechlorination or alternative methods of disinfection are options to be considered in order to comply with the TRC limit. Color in the South Fork Catawba and Catawba River Basin is viewed by DEM as a problem. Basin management plans are likely to develop strategies to address these problems. If significant industrial users (SIUs) contribute color to Belmont's effluent, the Town may wish to begin building a database for color. We recommend monitoring its influent and effluent in units of ADMI with periodic sampling of the SIUs contributing the color. If there are additional questions concerning these matters, please contact me. cc: Rex Gleason John R. Blowe