The URL can be used to link to this page

Home My WebLink AboutNC0064726_SPECULATIVE LIMITS_20040405NPDES DOCUWEMT SCANNIMO COVER $MEET NPDES Permit: NC0064726 East Bend Industrial Park WWTP Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Speculative Limits Instream Assessment (67b) Environmental Assessment (EA) Permit History Document Date: Aril 5, 2004 This aocumeat is priatea on reuse paper - ignore any content on the reverse side E 11 A ' �hcrnW'Y' April 5, 2004 Mayor William G. Hardy Town of East Bend P.O. Box 189 East Bend, North Carolina 27018 Michael F. Easley, Governor State of North Carolina William G. Ross, Jr., Secretary Department of Environment and Natural Resources Alan W. Klimek, P.E., Director Division of Water Quality Subject: Speculative Limits for East Bend WWTP NPDES Permit NCO064726 Town of East Bend Yadkin County Dear Mayor Hardy: This letter serves to transmit speculative effluent limits for a proposed WWTP discharging to two potential points on an unnamed tributary (UT) to Logan Creek (alternatives 1 and 2), and two potential points discharging to an unnamed tributary to the Yadkin River (alternatives 3 and 4). Your consultant requested speculative limits for permitted wastewater flows of 0.12 MGD. We have reviewed the request and provide the following response. The speculative limits presented here are based on our understanding of the proposal and of present environmental conditions. The Division of Water Quality (DWQ) cannot guarantee that it will issue the Town an NPDES permit to expand its discharge of treated wastewater into waters of the State. Nor can we guarantee that the effluent limitations and other requirements included in any permit will be exactly as presented here. Final decisions on these matters will be made only after the Division evaluates a formal permit application for the Town's discharge and notices the proposal for public comment. Environmental Assessments of New Projects and Expansions Any entity proposing to construct new or expanded wastewater treatment facilities using public funds or public (state) lands must first prepare an environmental assessment (EA) when wastewater expansions equal or exceed 0.5 MGD. The expansion phase to 0.12 MGD appears to be below this threshold and an EA may not be required. Please contact the Division's State Environmental Policy Act (SEPA) coordinator, currently Alex Marks, at (919) 733 - 5083, ext. 555 to ensure that this is the case. DWQ will not accept a permit application for a project requiring an environmental assessment until the Division has approved the EA and sent a Finding of No Significant Impact (FONSI) to the state Clearinghouse for review and comment. Engineering Alternatives Analysis (EAA) In accordance with the North Carolina General Statutes, the most practicable wastewater treatment and disposal alternative with the least adverse impact on the environment is required to be implemented with any expansion. Therefore, as a component of all NPDES permit applications for new or expanding flow, a detailed engineering alternatives analysis (FAA) must be prepared. The EAA must justify — requested flows and provide an analysis of potential wastewater treatment alternatives. North Carolina Division of Water Quality — (919) 733-7015 1617 Mail Service Center '^ FAX (919) 733-0719 Raleigh, North Carolina 27699-1617 On the Internet at http://h2o.enr.state.nc.us/ Mr. Hardy Page 2 Alternatives to a surface water discharge, such as a spray/drip irrigation, wastewater reuse, or inflow/infiltration reduction, are considered to be environmentally preferable. A copy of the EAA requirements is attached to this letter. Permit applications for new or expanding flow will be returned as incomplete if all EAA requirements are not adequately addressed. You may also wish to refer to the NPDES Unit website for more information regarding requests for expansion, http://h2o.enr.state.ne.us/NPDES/. j Speculative Effluent Limits We have reviewed information provided by your consultant and existing environmental conditions at the potential discharge points and determined that the proposed alternatives 1,2, and 3 are not viable due to the zero -flow nature of the receiving streams. We have included one additional alternative (Alternative # 5) in our analysis. Alternative # 5 is shown on the attached map, and it is located approximately 1000 ft. downstream of the alternative 2, after the confluence with a tributary. You should discuss the feasibility of this alternative with your consultant. Based on the available information, tentative limits for the proposed discharge of 0.12 MGD flow to the UT to the Logan Creek (State Alternative) and to the UT to the Yadkin River (Alternative 4) are outlined below. Also refer to Table 1 and Table 2 for an outline of the speculative limits. Alternative # 5 Flow Limits. The flow will be limited to 0.12 MGD as requested by the Town's consultant. Detailed justification for this level of flow must be provided. BOD5. The limits for BODS are based on minimum treatment levels required by federal regulations (30 mg/L monthly average). A water quality model was also used to ensure that this value would protect the instream dissolved oxygen standard of 5.0 mg/L. NH3-N. The 2.1/5.4 mg/L (summer/winter) limits were developed to protect aquatic life against ammonia toxicity in the receiving stream at the low flow. TSS. The limits for total suspended solids are based on minimum treatment levels required by federal regulations (30 mg/L monthly average). Fecal Coliform, pH. The limits for fecal coliform bacteria and pH are derived to protect water quality in the receiving stream and will likely remain the same as in the previous permit. Total Residual Chlorine (TRC). To protect the receiving stream from high concentration of chlorine, a TRC limit of 28 fig/L would be required at this site. Dissolved OxvEen (D.O.) The 5.0 mg/L effluent limit was based on the EPA -approved water quality model to protect aquatic life in the receiving stream against oxygen deficiency and to ensure protection of the D.O. water quality standard. Alternative # 4 Flow Limits. The flow will be limited to 0.12 MGD as requested by the "rown's consultant. Detailed justification for this level of flow must be provided. BODF,. The 6.7 mg/L limit was developed to protect aquatic life in the receiving stream at the -low flow. A water quality model was also used to -ensure that this value would protect the instream dissolved oxygen standard of 5.0 mg/L. Mr. l-lardy i Page 3 NH3-N. The 1.2/2.7 mg/L (summer/winter) limits were developed to protect aquatic life against ammonia toxicity in the receiving stream at the low flow. TSS. The limits for total suspended solids are based on minimum treatment levels required by federal regulations (30 mg/L monthly average). Fecal Coliform, pH. The limits for fecal coliform bacteria and pH are derived to protect water quality in the receiving stream and will likely remain the same as in the previous permit. Total Residual Chlorine (TRC). To protect the receiving stream from high concentrations of chlorine, a TRC limit of 21 pg/L would be required at this site. Dissolved Oxvaen (D.O.) The 5.0 mg/L effluent limit was based on the EPA -approved water quality model to protect aquatic life in the receiving stream against oxygen deficiency and to ensure protection of the D.O. water quality standard. If you have any additional questions about these limits, feel free to contact Sergei Chernikov at (919) 733-5083, extension 594. Sincerely, � � &� ,,y David A. Goodrich, Supervisor NPDES Unit Water Quality Section cc: Winston-Salem Regional Office/ WQS Central Files NPDES Unit Files Gregory K. Meshaw, P.E. Municipal Engineering Services Co. PA P.O. Box 97 Garner, NC 27529 Mr. Hardy Page 4 Table 1. Speculative Limits for the Alternative #5 Parameter Monthly Average Weekly Average Daily Maximum BOD5 (summer) 30.0 m /L 45.0 m /L BOD5 (winter) 30.0 m /L 45.0 m /L NF13-N (summer) 2.1 m /L 6.3 m /L NF13-N (winter) 5.4 m /L 16.2 m /L TSS 30.0 m /L 45.0 m /L Fecal coliform 200 #/ 100 mL 400 #/ 100 mL PH 6-9 DO* Total residual chlorine 28 pg/L * DO of the effluent has to be maintained at the level > 5.0 mg/L. Table 2. Speculative Limits for the Alternative #4 Parameter Monthly Average Weekly Average Daily Maximum BOD5 (summer) 6.7 m /L 10.1 m /L BOD5 (winter) 6.7 m /L 10.1 m /L NH3-N (summer) 1.2 m /L 3.6 m /L NH3-N (winter) 2.7 m /L 8.1 m /L TSS 30.0 m /L 45.0 m /L Fecal coliform 200 #/ 100 mL 400 #/ 100 mL PH 6-9 DO* Total residual chlorine 21 µg/L * DO of the effluent has to be maintained at the level > 5.0 mg/L. f I VW' \ igs \ ;"4 r v,�,,.t .�•.° r 7 i a L"E st Ben4 ' A/ � '3•�){il��'"x) A" � '-� iVa / dl� A r ll � Ai �A� tAr-+♦ f + � », !. A. A 1/ ( �-y.'\—� i ti� V lye � {� � "Wv '� ID 1�1 it r` (''"'P 'f /c+'}'��" / \ fl�j i \\ I'�,j5�� ! / j v s' n r • x\ n1✓ r1 \)l�t(l{ %I VA A u .ig VN i 1{ � el.Y �Fr11��T ji a n(`{iJ 1.�)�s�}��l �'/ �B�l ., � �`!' �/41� �� / •) A' �' _ ✓ t S'�LClY1�IVe \f � A � x i�l�=c +/ ° �'7l�1 I t�� ` w tc lT. H^ .r31tAA, iiw r'ttt` r 'ls 1`_ M i.>Et �.v `w2(3y'rK-i'$= ° N,s {'4'LSC1]fl. a..� +c'S �� 'rd ° ! L}9"x # d- / .i. 11 • M* i \wWh /r+.. i! /�} l °�� r call7/ �.'. Ji `Tq 91. 4 V ! -- � d/ �� I ��`• 6(;I (� k'._ (al. /is \\ l t'.f'� \ 3 >r -.1 N u` y'"\'",, i_.��•t \, \\Jyz r l/irl�� I t ) off( \ 1 ti;��.�i�s;�lgp;. a.,..ly � �•`C" ��1./ `�. i l l�� ' "�"C l IInn�ted tnb lax cw /•• � to I:og�n Cheek' ,,]]��,,s� f t € 1 11 � // jl � '' �:*)\� r. '9, � J �. � A ]r� _ �/ �e � �`Le•- `r9P "��i- - /�i,l �°%�3- r � ! � 1'f ; ! � / \� Y J-^vr'fa5 wrcBir /�\ / J3 ✓l/ � ° ' r � % i.� ,#�yla�:, `.`\' \ l i/ /il.'\`� `I/"�� 1.�•///,:. ;'�lij ��,,,dr/ a° I �a I ' I!� � I ✓�� 4 a '—�- -rut -1 iA% �� I l��- �A4 JiV Facility M ' Proposed Discharge SOUTH To Logan Creek Location Alt #1 Latitude: 36' 12' 32" N Longotude: 80° 31' 13" W _ 'r Alt#2 Latitude: 36 12' 08" N lon `tude 80° 3V 11" \V not to scale Flow Request 0.120 MGD Reoeivrtt2 SieBn: UI' of the Yadkin River Stre Class: C Sate Grid/ LISGS quad: C 16 NE / East Bend, N.C. North ,•',, � � L� Sub -Banc 03-07-02 Drai+4�e Basin: ax Yadkin - PDee "' Yadkin COLin r,+p. A 9nry b m1 \ � n 2 y +� m iz Ile I I MI.