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HomeMy WebLinkAboutNC0033111_Data Verification_19980724 State of North Carolina Department of Environment and Natural Resources A731111Yillrif Division of Water Quality r ............ - James B. Hunt, Jr., Governor NCDENR Wayne McDevitt, Secretary A. Preston Howard, Jr., P.E., Director NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES Carl Daniel July 24, 1998 Carolina Water Service, Inc. P. O. Drawer 240908 Charlotte, NC 28224 Subject: Data Verification for NPDES Permit NC0033111 Northeast Craven Utilities WWTP Craven County Dear Permittee: The Division of Water Quality is conducting a critical short-term review of Total Nitrogen discharge data in the Neuse River Basin. By this letter, we are requiring that you submit certain 1995 monitoring data to the Division no later than August 7, 1998, as explained below. In December 1997, the Environmental Management Commission (EMC) adopted the Neuse River Basin Nutrient-Sensitive Waters Management Strategy rules (15A NCAC 2B.0200). The Division used 1995 Total Nitrogen (TN) data from the permitted dischargers in the basin to estimate the annual nitrogen loading from all point sources. The estimated TN load was used to establish the individual and group TN allocations found in the rules (15A NCAC 2B.0234). Recent review of the data has raised questions about the validity of the estimated TN load. The Laboratory Certification Unit has also reported that calculation errors are still common when determining values for TN concentration in effluent samples. The Division is taking a fresh look at the 1995 TN data to determine whether they contain significant errors which could affect the estimated TN load and allocations. The Division is scheduled to present findings from this review at the September EMC meeting. It is essential that the data be gathered quickly and reviewed. By this letter, the Division requires the subject facility to collect all laboratory data sheets and/or bench sheets for all nitrogen species analyses (NO2, NO3, NH,and/or TKN) of the subject facility's effluent discharges monitored in calendar year 1995. Submit the data to the Division no later than August 7, 1998. Send data packages to: Charles Weaver NC DENR- DWQ - NPDES Unit P.O. Box 29535 or 512 North Salisbury Street Raleigh, NC 27626 Raleigh, NC 27604 (mailing address) (physical address) We appreciate your prompt attention to this matter. If you have any questions regarding this request, please contact Mark McIntire at (919) 733-5083 (extension 553), Charles Weaver(extension 511) or Mike Templeton (extension 541). Sincerely, h4A/7: ///1Preston Howard, Jr., P.E. ..< cc: Central Files Washington Regional Office, Water Quality Section NPDES Unit Files P.O. 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