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Home My WebLink AboutNC0021873_Permit (Modification)_20071106NPDES DOCUMENT SCANNIN` COVER SHEET NPDES Permit: NC0021873 Mayodan WWTP Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Engineering Alternatives (EAA) Correspondence Owner Name Change Instream Assessment (67b) Speculative Limits Environmental Assessment (EA) Document Date: November 6, 2007 This document is printed on reuse paper - ignore any. content on the reYerse side NCDENR Michael F. Easley Govemor William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources Coleen H. Sullins, Director Division of Water Quality November 6, 2007 Ms. Debra Caldwell, Town Manager Town of Mayodan 210 West Main Street Mayodan, North Carolina 27027 Subject: Minor Modification of NPDES Permit NC0021873 Mayodan Waste Water Treatment Plant Caldwell Road Rockingham County Dear Ms. Caldwell: The Division of Water Quality (the Division) has noticed minor errors in your current permit, recently effective on November 1, 2007, and wishes to provide change pages to correct these errors. Please inset these pages into your existing permit and discard the old pages. We have changed: • your ammonia limit (NH3 as N) Weekly Average to read 35.0 mg/L (from 40.2 mg/L), and • mercury monitoring sample type to "grab" (not "composite"), and • we have added a footnote to reflect that mercury should be analyzed using EPA Method 1631E, or a low-level method subsequently approved by EPA and certified by the state of North Carolina. This permit is issued pursuant to the requirements of North Carolina General Statute 143-215.1 and the Memorandum of Agreement between North Carolina and the U.S. Environmental Protection Agency dated May 9, 1994, or as subsequently amended. If any parts, monitoring 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. You must submit this request in the form of a written petition, conforming to Chapter 150E of the North Carolina General Statutes, and file it with the office of Administrative Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714. Unless such a demand is made, this permit shall be final and binding. N. C. Division of Water Quality / NPDES Unit 1617 Mail Service Center, Raleigh, NC 27699-1617 Internet: h2o.enr.state.nc.us Phone: (919) 733-5083 fax: (919) 733-0719 DENR Customer Service Center 1 800 623-7748 Minor Modification of NPDES Permit NC0021873 Town of Mayodan WWTP Page 2 Please notice that this permit is not transferable except after notifying the Division. The Division may modify, or revoke and reissue this permit. This permit does not affect your legal requirements to obtain other permits required by the Division of Water Quality, the Division of Land Resources, the Division of Coastal Management, or by federal or other local governments. If you have questions, or if we may be of further service, please call Joe Corporon at (919) 733-5083, extension 597 or email joe.corporon@ncmail.net. Sincerely, ,Cr 1 Coleen H. Sullins Enclosure: NPDES Permit Change Pages (NC0021873) cc: Winston-Salem Regional Office, Water Quality Section NPDES Program Aquatic Toxicology Unit Pretreatment Unit EPA Region 4 Permit NC0021873 A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - (2.5 MGD) Beginning on the permit effective date and lasting until the twelve (12) month average flow exceeds 2.0 MGD, or until permit expiration, the Permittee is authorized to discharge treated wastewater from Outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: EFFLUENT CHARACTERISTICS EFFLUENT LIMITATIONS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Location , Flow 2.5 MGD Continuous Recording Influent or Effluent BOD, 5-day, 20°C 2 30.0 mg/L 45.0 mg/L 3/Week Composite Influent and Effluent Total Suspended Solids2 30.0 mg/L 45.0 mg/L 3/Week Composite Influent and Effluent NH3 as N (Apr 1 - Oct 31) 16.1 mg/L 35.0 mg/L 3/Week Composite Effluent NH3 as N (Nov 1 — Mar 31) 1/Week Composite Effluent Total Residual Chlorine 28 µg/L 3/Week Grab Effluent Fecal Coliform (geometric mean) 200/100 ml 400/100 ml 3/Week Grab Effluent pH3 3/Week Grab Effluent Dissolved Oxygen 3/Week Grab Effluent Temperature 3/Week Grab Effluent Conductivity 3/Week Grab Effluent Total Nitrogen (NO2+NO3+TKN) 1/Month Composite Effluent Total Phosphorus 1/Month Composite Effluent Total Lead 34 µg/L 1/Week Composite Effluent Total Selenium 102 µg/L 56 µg/L 1/Week Composite Effluent Total Copper 2/Month Composite Effluent Total Silver 2/Month Composite Effluent Total Zinc 2/Month Composite Effluent Chronic Toxicity4 1/Quarter Composite Effluent Notes: 1. See Part A. (4) for instream sampling requirements. 2. The monthly average effluent BODS and TSS concentrations shall not exceed 15% of the respective influent value (i.e., 85% removal is required). 3. Effluent pH shall not fall below 6.0 nor exceed 9.0 standard units. 4. Chronic Toxicity (Ceriodaphnia) at 5 % with testing in March, June, September and December [see A. (5.)]. The Permittee shall discharge no floating solids or foam visible in other than trace amounts. Permit NC0021873 A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - (3.0 MGD) During the period after the twelve (12) month average flow exceeds 2.0 MGD and lasting until the twelve (12) month average flow exceeds 2.4 MGD, or until permit expiration, the Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below: EFFLUENT CHARACTERISTICS EFFLUENT LIMITATIONS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Location 1 Flow 3.0 MGD Continuous Recording Influent or Effluent BOD, 5-day, 20°C 2 30.0 mg/L 45.0 mg/L 1/Day Composite Influent and Effluent Total Suspended Solids 2 30.0 mg/L 45.0 mg/L 1/Day Composite Influent and Effluent NH3 as N (Apr 1 - Oct 31) 14.0 mg/L 35.0 mg/L 1/Day Composite Effluent NH3 as N (Nov 1 — Mar 31) 3/Week Composite Effluent Total Residual Chlorine 28 µg/L 1/Day Grab Effluent Fecal Coliform (geometric mean) 200/100 ml 400/100 ml 1/Day Grab Effluent pH 3 1/Day Grab Effluent Dissolved Oxygen 1/Day Grab Effluent Temperature 1/Day Grab Effluent Conductivity 1/Day Grab Effluent Total Lead 34 µg/L 1/Week Composite Effluent Total Selenium 74 µg/L 56 µg/L 1/Week Composite Effluent Total Nitrogen (NO2+NO3+TKN) 1/Month Composite Effluent Total Phosphorus 1/Month Composite Effluent Total Mercury 4 2/Month Grab Effluent Total Copper 2/Month Composite Effluent Total Silver 2/Month Composite Effluent Total Zinc 2/Month Composite Effluent Chronic Toxicity 5 1/Quarter Composite Effluent Notes: 1. See Part A. (4) for instream sampling requirements. 2. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent value (i.e., 85% removal is required). 3. Effluent pH shall not fall below 6.0 nor exceed 9.0 standard units. 4. Mercury sampling and analyses shall be conducted using techniques described in USEPA test Method 1631E, or other EPA approved low-level method certified by the state of North Carolina. 5. Chronic Toxicity (Ceriodaphnia) at 6% with testing in March, June, September and December [see A. (6.)]. The Permittee shall discharge no floating solids or foam visible in other than trace amounts. Permit NC0021873 A. (3.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - (4.5 MGD) During the period after the twelve (12) month average flow exceeds 2.4 MGD and lasting until the twelve (12) month average flow exceeds 3.6 MGD, or until permit expiration, the Permittee is authorized to discharge from Outfall 001. Such discharges shall be limited and monitored by the Permittee as specified below. EFFLUENT CHARACTERISTICS EFFLUENT LIMITATIONS MONITORING REQUIREMENTS Monthly Average Weekly Average Daily Maximum Measurement Frequency Sample Type Sample Location' Flow 4.5 MGD Continuous Recording Influent or Effluent BOD, 5-day, 20°C 2 30.0 mg/L 45.0 mg/L 1/Day Composite Influent and Effluent Total Suspended Solids 2 30.0 mg/L 45.0 mg/L 1/Day Composite Influent and Effluent NH3 as N (Apr 1 - Oct 31) 9.3 mg/L 27.9 mg/L 1/Day Composite Effluent NH3 as N (Nov 1 - Mar 31) 27.5 mg/L 35 mg/L 1/Day Composite Effluent Total Residual Chlorine 28 µg/L 1/Day Grab Effluent Fecal Coliform (geometric mean) 200/100 m1 400/100 ml 1/Day Grab Effluent pH 3 1/Day Grab Effluent Dissolved Oxygen 1/Day Grab Effluent Temperature 1/Day Grab Effluent Conductivity 1/Day Grab Effluent Total Lead 34 µg/L 1/Week Composite Effluent Total Mercury 4 0.14 µg/L 1/Week Grab Effluent Total Selenium 59 µg/L 56 µg/L 1/Week Composite Effluent Total Nitrogen (NO2+NO3+TKN) 1/Month Composite Effluent Total Phosphorus 1/Month Composite Effluent Total Copper 2/Month Composite Effluent Total Silver 2/Month Composite Effluent Total Zinc 2/Month Composite Effluent Chronic Toxicity 5 1/Quarter Composite Effluent Notes: 1. See Part A. (4) for instream sampling requirements. 2. The monthly average effluent BOD5 and TSS concentrations shall not exceed 15% of the respective influent value (i.e., 85% removal is required). 3. Effluent pH shall not fall below 6.0 nor exceed 9.0 standard units. 4. Mercury sampling and analyses shall be conducted using techniques described in USEPA test Method 1631E, or other EPA approved low-level method certified by the state of North Carolina. 5. Chronic Toxicity (Ceriodaphnia) at 9 % with testing in March, June, September and December [see A. (7.)]. The Permittee shall discharge no floating solids or foam visible in other than trace amounts. Permit NC0021873 A. (4.) INSTREAM MONITORING REQUIREMENTS = coda' 4. bt hr 5 � �� .h =. i, '^ 8 t'. .f � 4, �n � ,' iticy+}, Cris . � 1 �3 Y� -1 � r �ZAF � 1i ti �i,fl��. � s' • ��`{� 'Y , Y ` �Si`C i i i .i `"U'r:.'7.A7 •.•e —like: ,$. , /,� i w' ! �{,� : r. . � �7.�;��7 ( ' : i � �P�i'�� rc`xi�s u� e � 4c.Y� +�.' ^�y�' �� 'ih a !t$�? �Y! . ` '.. ' ..'i . � e• :s.� ��,.� t.:� ,�'Y 3'iC ` {y. ii sL e I.t • c..t ., • 'r �4: ► jt ... S w el 'fit .0 i�t »s a '„ i ' � V z t..,e Y �:•, 1w "fit: i Inn e :'*[ a ., 't��i�:a}^lps� Grab .� s'._eig:, �.••�.—,t7517 s 4 c A. e `i 4. �` �` [�� 4 �. x Strn� 5oeftpoRa�4Y ,: �Z��sz,,�6a�-•-s�.�"va�c:a'.�•r.�.,�ss�«..e 3�a�. ' Upstream at NC Hwy 135, Downstream at NCSR 2177 Dissolved Oxygen June -September 3/week October -May 1/week Temperature June -September 3/week Grab Upstream at NC Hwy 135, Downstream at NCSR 2177 October -May 1/week pH June -September 3/week Grab Upstream at NC Hwy 135, Downstream at NCSR 2177 October -May 1/week Conductivity June -September 3/week Grab Upstream at NC Hwy 135, Downstream at NCSR 2177 October -May 1/week A. (5.) QUARTERLY CHRONIC TOXICITY PERMIT LIMIT - (2.5 MGD) The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant mortality to Ceriodaphnia dubia at an effluent concentration of 5%. 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 March, June, September and December. 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 TGP3B for the pass/fail results and THP3B for the Chronic Value. Additionally, DWQ Form AT-3 (original) is to be sent to the following address: Attention: NC DENR / DWQ / Environmental Sciences Section 1621 Mail Service Center Raleigh, North Carolina 27699-1621 Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section 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.