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Home My WebLink AboutNC0049867_Speculative Limits_20180309I C1 Water Resources ENVIRONMENTAL OUALITY March 9, 2018 The Honorable Danny Gabriel Mayor City of Cleveland 302 East Main Street PO Box 429 Cleveland, North Carolina 27013 ROY COOPER Garenmr MICHAEL S. REGAN Seuetan LINDA CULPEPPER Subject: Speculative Effluent Limits Cleveland WWTP Permit No. NCO049867 Rowan County Yadkin River Basin Dear Mayor Gabriel: hver'irn Dhmoi' This letter provides speculative effluent limits for 0.4 MGD and 0.5 MGD at the Cleveland WWTP. The Division received the speculative limits request in a letter dated September 7, 2017 from Danny Gabriel, Mayor of the City of Cleveland. Please recognize that speculative limits may change based on future water quality initiatives, and it is highly recommended that the applicant verify the speculative limits with the Division's NPDES Unit prior to any engineering design work. Receiving Stream. Third Creek is located within the Yadkin River Basin. Third Creek has a stream classification of C, and waters with this classification have a best usage for aquatic life propagation and maintenance of biological integrity, wildlife, secondary recreation and agriculture. Third Creek has a summer 7Q 10 flow of 14.0 cfs, a winter 7Q 10 flow of 24.1 cfs, and an annual average flow of 89.1 cfs. There is a Total Maximum Daily Load (TMDL) on Third Creek for turbidity. The TMDL applies to non - point sources and the NC DOT. WWTP point sources contribute negligible loading to the turbidity impairment and secondary treatment standards for TSS remain. Third Creek ultimately drains into High Rock Lake, which is listed on the 303(d) list as impaired for chlorophyll -a, and there is an impending TMDL to address the chlorophyll -a impairment. Based upon a review of information available from the North Carolina Natural Heritage Program Online Map Viewer, there are not any Federally Listed threatened or endangered aquatic species identified within a five -mile radius of the proposed discharge location. If there are any identified threatened/endangered species, it is recommended that the applicant discuss the proposed project with the US Fish and Wildlife Service to determine whether the proposed discharge location might impact such species. Speculative Effluent Limits. Based on Division review of receiving stream conditions and water quality modeling results, speculative limits for the proposed expansion to 0.4 MGD and 0.5 MGD are presented in Tables 1 and 2, respectively. A complete evaluation of these limits and monitoring requirements for metals and other toxicants, as well as potential instream monitoring requirements, will be addressed upon receipt of a formal NPDES permit application. Some features of the speculative limit development include the following: State of North Carolina I Environmental Quality I Water Resources 1617 Mail service Center I Raleigh, North Carolina 27699-1617 919 707 9000 BOD/NH3 Limits. These speculative limits are based on freezing current permitted BOD ultimate loading (i.e., facility will not be allowed to discharge oxygen -consuming waste above what is currently permitted). The resultant limits at expanded flows are considered technologically -feasible. Nutrient Limits. A TMDL to address nutrient loading to High Rock Lake is currently in progress. In this interim period prior to TMDL finalization, these speculative nutrient limits are based on EPA guidance for impaired waters: 1) for total phosphorus (TP), freeze the current permitted TP mass load at expanded flows; and 2) for total nitrogen (TN) which has no limits in the current permit, freeze the actual TN mass load based on the historical loading from January 2016 through December 2017. The final TMDL results will ultimately override these speculative limits, and may result in more stringent nutrient requirements. TABLE 1. Speculative Limits for City of Cleveland WWTP (Proposed Expansion to 0.4 MGD) Effluent Characteristic -. Effluent;Limitations Montt y Average Weeekly Average Daily Maximum Flow 0.4 MGD BOD5 10.1 m 15.1 m NH3 asN 4.0m 6.0m Dissolved Oxygen (minimum) 5.0 mg/L Daily Minimum TSS 30 m 45 m TRC 28 1 Fecal coliform (geometric mean 200/100 ml 400/100 ml Total Phosphorus 1,994 lbs/ ear annual load Total Nitrogen 9 7771bs/ ear annual load Chronic Toxicity Pass/Fail (Quarterly test 3.7% Note: At 0.4 MGD, nutrient load limits are equal to TP = 1.6 mg/l, and TN = 8.0 mg/1. TABLE 2. Speculative Limits for City of Cleveland WWTP (Proposed Expansion to 0.5 MGD) Effluent Characteristic Effluent Limitations. Monthly Avera k e. Weekly - Aver e Daily Maximum Flow 0.5 MGD BOD5 8.1 m 12.1 m NH3 as N 3.2 m 4.8 m Dissolved Oxygen (minimum) 5.0 mg/L Daily Minimum TSS 30 m 45 m TRC 28 1 Fecal coliform (geometric mean 200/100 ml 400/100 ml Total Phosphorus 1 9941bs/ ear annual load Total Nitrogen 9 7771bs/ ear annual load Chronic Toxicity Pass/Fail 4.5% (Quarterly test .Note: At U.5 MUD, nutrient load limits are equal to TP =1.3 mg/1 and TN = 6.4 mg/l. En ' eering Alternatives Analysis (EM. Please note that the Division cannot guarantee that an NPDES permit for a new or expanding discharge will be issued with these speculative limits. Final decisions can only be made after the Division receives and evaluates a formal permit application for the new/expanded discharge. In accordance with North Carolina Administrative Code 15A NCAC 2H.0105( c), the most environmentally sound alternative should be selected from all reasonably cost effective options. Therefore, as a component of all NPDES permit applications for new or expanding flow, a detailed engineering alternatives analysis (EAA) must be prepared. The EAA must justify requested flows and provide an analysis of potential wastewater treatment alternatives. A copy of the Division guidance for preparing EAA documents is attached. State Environmental Policy Act (SEPA) EA/EIS Requirements A SEPA EA/EIS document may be required for projects that: 1) involve $10 Million or more of state funds; or 2) will significantly and permanently impact 10 or more acres of public lands. Please check with the DWR SEPA coordinator (David Wainwright, 919-807-6442) as to whether your project requires SEPA review. For projects that are subject to SEPA, the EAA requirements discussed above will need to be folded into the SEPA document. Additionally, if subject to SEPA, the NPDES Unit will not accept an NPDES permit application for a new/expanding discharge until the Division has approved the SEPA document and sent a Finding of No Significant Impact (FONSI) to the State Clearinghouse for review and comment. Should you have any questions about these speculative limits or NPDES permitting requirements, please feel free to contact David Hill at (919) 807-6304 or Julie Grzyb at (919) 807-6390. Respectfully, J lie Grzyb Supervisor, NPDES Complex Permitting Unit Attachment: EAA Guidance Document Hardcopy: Central Files NPDES Permit File Electronic Copy: DWR/Mooresville Regional Office/Water Quality DWRIBasinwide Planning/Ian McMillan DWR/NPDES Server>Specs Speculative Limits Development for Cleveland WWTP NCO049867 February 27, 2018 The Town of Cleveland has requested speculative effluent limits for proposed flows of 0.4 & 0.5 MGD in a letter dated September 7, 2017. The facility discharges to Third Creek, class C, in the Yadkin Pee -Dee river basin. Statesville's Third Creek W WTP and Seven Cedars MHP also discharge to Third Creek and are accounted for in the modeling. The stream is subject to a TMDL for turbidity impairment, with W WTPs contributing negligible loading to the impairment at secondary standards. The Town submitted s7Q 10 flow for USGS stream gauge 02120500 located just upstream of the facility's outfall as published in the USGS' Low flow characteristics and flow -duration statistics for selected USGS continuous -record streamgaging stations in North Carolina through 2012. However, the station was only active from 1940- 1971 and the published s7Q10 is 2 cfs greater than that used in previous models for this and other facilities on Third Creek. The more conservative 14 cfs as originally used was maintained for this model run. The original Level B input file for the 1994 model could not be located so model conditions were recreated using input parameters from the model's hardcopy in the files. The recreated model closely matched the original model outputs with a DO minimum of 3.95 mg/L at mile -point 17.5 versus a DO minimum of 3.97 mg/L at mile -point 17.27 in the original model. The model was reran using the current permitted limits for all dischargers along Third Creek. Since the 1994 model, Statesville's Third Creek plant has upgraded from 4.0 MGD to 6.0 MGD with an additional 8.0 MGD expansion tier. BODu and nutrient loads were frozen at the 4.0 MGD permit limits for the 6.0 and 8.0 MGD expansions. Running the model at the current operating configurations removed the <5 mg/L DO sags in the original (1994) configuration. Freezing Cleveland's current BODu load, the model was ran comparing all possible flows for Cleveland at 0.27, 0.4, and 0.5 MGD versus Statesville at 6.0 and 8.0 MGD respectively. No combination of current or projected flows caused the stream to drop below 5.0 mg/L with the worst -case scenario being a DO minimum of 5.73 mg/L with Cleveland discharging 0.27 MGD and Statesville at 8.0 MGD. Third Creek drains to High Rock Lake which is currently impaired for chlorophyll -a. Until the implementation of a TMDL or nutrient criteria, nutrient loads for total nitrogen and phosphorous for Cleveland will be frozen at 2016-2017 levels. The plant was discharging less nitrogen prior to mid 2015 due to operating conditions where aeration was not sufficiently maintained in the oxidation ditch. The facility switched operators in mid 2015 which improved operations in the oxidation ditch causing ammonia levels to consistently approach non -detection levels with the side effect of increasing total nitrogen. It is recommended that the Town of Cleveland be given speculative limits for 0.4 and 0.5 MGD expansions freezing the current BODu load, and freezing TN and TP at 2016-2017 annual averages. David Hill citcm 71, 0. 3. aff q ;ZS AT �� 5 � � 41e. � Seen ar I I � � I � I � , G, 'O'g�mb-O 01 Al &10 �66 YPO /61is CAA &91, ;z (ZA 5G,I1 4.6' :7i�i' zl. c q r p q�64 I A4 ILI 146,0 0, 15 o, :lPy r4 pn i yi.4 4L f yn a 4<4 Oar-, e- /I e, f i'4-* U-5 �V e- 14 1 ell L) Vf Cj 14y F 7.1 Gvt j L)74 65'1 e j , epmvoo I V PA P4 1 1 Ammonia-N and TN Overtime 50 45 40 s 35 • 30 • • J 25 • Ammonia • • • ,• 'A • • • TN 20 �" • • • • • 15 • • • • • • • 10 • ` • • f • 5 • •• • • • • 0 5/6/2013 11/22/2013 6/10/2014 12/27/2014 7/15/2015 1/31/2016 8/18/2016 3/6/2017 9/22/2017 4/10/2018 14L,4 Aor 7.60 7.40 7.20 J 7.00 6.80 O Q 6.60 6.40 6.20 0.00 7.60 7.40 7.20 7.00 6.80 6.60 6.40 6.20 0.00 Cleve 0.5, States 6.0 5.00 10.00 Cleve 0.4, States 6.0 15.00 5.00 10.00 15.00 gm 20.00 7.00 6.80 6.60 6.40 6.20 6.00 5.80 5.60 0.00 7.00 6.80 6.60 6.40 6.20 6.00 5.80 5.60 0.00 Cleve 0.5, States 8.0 5.00 10.00 Cleve 0.4, States 8.0 5.00 10.00 15.00 15.00 F� ma co 7.00 6.80 6.60 6.40 6.20 6.00 5.80 5.60 0.00 7.60 7.40 7.20 7.00 6.80 6.60 6.40 6.20 0.00 Cleve CURRENT, States 8.0 5.00 10.00 15.00 Current Configuration: Cleve 0.27, States 6.0 5.00 10.00 15.00 7.00 6.00 5.00 4.00 3.00 2.00 1.00 0.00 20.00 0.00 20.00 Original: Cleve 0.27, States 4.0 5.00 10.00 15.00 20.00 SUMMER olcS�Y�I� C'. o. Z� S 4- D ---------- MODEL RESULTS ---------- Discharger CLEVELANDWWTP Receiving Stream THIRD CREEK ---------------------------------------------------------- The End D.O. is 6.33 mg/l. The End CBOD is 7.89 mg/l. The End NBOD is 4.72 mg/l. WLA WLA WLA DO Min CBOD NBOD DO Waste Flow (mg/1) Milepoint Reach ---------------------- # (mg/1) ---- (mg/1) ---- (mg/1) -- (mgd) ---------- Segment 1 3.95 17.50 4 Reach 1 60.00 58.50 5.00 4.00000 Reach 2 45.00 90.00 0.00 0.01000 Reach 3 30.00 54.00 5.00 0.27000 Reach 4 0.00 0.00 0.00 0.00000 Reach 5 0.00 0.00 0.00 0.00000 Reach 6 0.00 0.00 0.00 0.00000 *** MODEL SUMMARY DATA *** Subbasin 30706 Discharger CLEVELANDVIWTP Stream Class C Receiving Stream THIRD CREEK punter 7Q10 24.10 Summer 7Q10 14.00 Design Temperature: 25.0 LENGTH SLOPE VELOCITY DEPTH Kd Kd Ka Ka KH KN KNR KNR SOD SOD mile ft/mi fps ft design @200 design @20° design @20° design @20° design @20° ------------------------- --------------------------- ------------------^--^- ---- 0.29 0.23 2.86 2.56 0.49 0.30 0.44 0.00 0.00 0• 00 Segment1 2.30 5.22 0.378 1.86 Reach 1 ------------------------ ----- -----------^---- Segment 1 7.9D 5.22 0.363 1.92 0.00 0.00 0.29 0.23 2.75 2.46 0.44 0.30 0.44 0.00 Reach 2 Segment -� ------^-------------------- --------------------^---- 5egment 1 3.28 9.82 0.351 1.98 0.28 0.23 2.95 2.20 0.94 0.30 0.49 0.00 0.00 0. 00 Reach 3 ---------------------- ---------------^------------- Segment 00 ^ 1 4.25 2.35 0.284 2.21 0.27 0.21 0.97 0.87 0.44 0.30 0.49 0.00 0.00 - Reach 4 --^-----------------^----- __ ------------------------------^---- 00 ----------------------- Segment 1 0.20 50:00 0.691 1.92 0.62 0.49 50.11 99.94 0.73 0.50 0.73 0.00 0.00 0. Reach 5 --^--------------- ---^----------------- ------------------ 0.00 Segment 1 0.80 4.35 0.340 2.03 0.28 0.22 2.14 1.92 0.44 0.30 0.44 0.00 0.00 Reach6 ------------------------- ------------------------------------------------------------- Flow CBOD NBOD D.O. cfs mg/l mg/1 mg/l Segment 1 Reach 1 Waste 6.200 60.000 59.500 5.000 Headwaters 13.200 2.000 1.000 7.440 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.170 2.000 1.000 7.440 Segment 1 Reach 2 Waste 0.016 45.000 90.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.050 2.000 1.000 7.440 Segment 1 Reach 3 Waste 0.419 30.000 54.000 5.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 9 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 5 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 6 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0 . 0-4 0-2 .-K1.000 7.440 * Runoff flow is in cfs/mile SUMMER Ct�,rre,V�� C . Z� ---------- MODEL RESULTS -- Discharger CLEVELANDWWTP Receiving Stream THIRD CREEK ------------------------------------------------- The End D.O. is 7.48 mg/l. The End CBOD is 4.84 mg/l. The End NBOD is 1.41 mg/l. ------------------------------------------------- WLA WLA WLA DO Min CBOD NBOD DO Waste Flow (mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) (mgd) ---------- Segment ---------------------- 1 6.43 0.00 ---- 1 ---- -- Reach 1 24.00 9.45 5.00 6.00000 Reach 2 45.00 90.00 0.00 0.01000 Reach 3 30.00 27.00 5.00 0.27000 Reach 4 0.00 0.00 0.00 0.00000 Reach 5 0.00 0.00 0.00 0.00000 Reach 6 0.00 0.00 0.00 0.00000 *** MODEL SCARY DATA *** Subbasin 30706 Discharger CLEVELANDWNTP Stream Class C Receiving Stream THIRD CREEK Winter 7Q10 24.10 Summer 7010 14.00 Design Temperature: 25.0 Ka LENGTH SLOPE VELOCITY DEPTH Kd Kd de Ka KN KN KNR SOD SOD @20° design @20° design @20° design @20° design @20° mile ft/mi fps ft design ------- -----^- ----------- ------------------ 0.23 3.19 2.86 0.99 0.30 0.49 0.00 0.00 Segment 1 2.30 5.22 0.422 1.89 0.30 Reach------------------- ------------ ^------------------------------------- 00 Segment 1 7.90 5.22 0.405 1.95 0.29 0.23 3.06 2.75 0.44 0.30 0.44 0.00 • Reach2 --------- -------------------------- -----^---^---------- -------------- .99 0.44 0.30 0.44 0. 00 0.00 Segment 1 3.28 4.82 0.389 2.02 0.29 0.23 2.72 2 Reach ------------------- ------------------------------------- ------- .96 0.44 0.30 0.44 0.00 0.00 Segment 1 4.25 2.35 0.315 2.25 0.27 0.21 1.07 0 Reach 4----------0.00 0.00 - ----------------^--^-------- 0.767 1.95 0.65 0.52 55.58 49.85 0.73 0.50 0.73 Segment 1 0.20 50.00 Reach 5 -----^--^--------------- ----------------------------------- 0 0.00 S0.28 0.23 2.38 2.23 0.49 0,30' Segment 1 0.80 4.35 0.377 2.06 0.94 0.0 Reach---------------6------------------------------^--^-------------------------^-------------------------- ^----------------- Flow CBOD NBOD D.O. cfs mg/l mg/l mg/l Segment 1 Reach 1 Waste 9.300 24.000 9.450 5.000 Headwaters 13.200 2.000 1.000 7.440 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.170 2.000 1.000 7.440 Segment 1 Reach 2 0.000 Waste 0.016 45.000 90.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.050 2.000 1.000 7.440 Segment 1 Reach 3 Waste 0.419 30.000 27.000 5.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 4 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 5 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 6 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 * Runoff flow is in cfs/mile 0.00 0.00 0.00 0.00 0.00 0.00 SUMMER C • C,�./K1T J U •� ---------- MODEL RESULTS ---------- Discharger CLEVELANDWWTP Receiving Stream THIRD CREEK ---------------------------------------------------------------------- The End D.O. is 6.82 mg/l. The End CBOD is 5.82 mg/l. The End NBOD is 1.72 mg/l. ---------------------------------------------------------------------- WLA WLA WLA DO Min CBOD NBOD DO Waste Flow (mg/1) Milepoint Reach ---------------------- # (mg/1) ---- (mg/1) ---- (mg/1) -- (mgd) ---------- Segment 1 5.73 17.50 9 Reach 1 24.00 9.45 5.00 8.00000 Reach 2 45.00 90.00 0.00 0.01000 Reach 3 30.00 27.00 5.00 0.27000 Reach 9 0.00 0.00 0.00 0.00000 Reach 5 0.00 0.00 0.00 0.00000 Reach 6 0.00 0.00 0.00 0.00000 *** MODEL SUMMARY DATA *** Discharger CLEVELANDWWTP Subbasin 30706 Receiving Stream THIRD CREEK Stream Class C Summer 7Q10 14.00 Winter 7010 24.10 Design Temperature: - 25.0 LENGTH SLOPE VELOCITY DEPTH Kd de Kd Ka Ka KN KN KNR KNR SOD SOD mile ft/mi fps ft design @20° design @20° design @20° design @20° design @20° --------------------------------- -------------------------------------- ------------------ 0.00 Segment 1 2.30 5.22 0.464 1.92 0.30 6.24 2.38 2.13 0.94 0.30 0.44 0.00 Reach 1 ------------------------- ----------------- 0.30 0.23 2.28 2.09 0.99 0.30 0.44 0.00 ------------------------ ------------------^--------------------0.00 Segment 1 7.90 5.22 0.445 1.98 Reach 2 -------------------------- 00 ....--------------------- ----^----^----------------- ------------------------ Segment 1 3.28 4.82 0.427 2.05 0.29 0.23 2.02 1.81 0.44 0.30 0.44 D.00 - Reach3 ---------------------------- ---------------------------------------------- ------------------------------- 00 ---------------------- Segment 1 4.25 2.35 0.345 2.28 0.27 0.22 0.80 0.71 0.44 0.30 0.49 0.00 0• Reach 4 ------------------------ 00 ---------- ------------- ---»----^----^- 1.47 0.68 0.54 41.2i 36.96 0.73 0.50 0.73 0.00 Segment 1 0.20 50.00 0.890 0. Reach 5 ------------------------- 00 -----------------^---^--------- ------------------------------ Segment 1 0.80 4.35 0.413 2.09 0.29 0.23 1.76 1.58 0.44 0.30 0.44 0.00 0- Reach 6 --------------------------- ------------------------------------------------------------- Flow CBOD NBOD D.O. cfs mg/l mg/l mg/l Segment 1 Reach 1 Waste 12.400 24.000 9.450 5.000 Headwaters 13.200 2.000 1.000 7.440 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.170 2.000 1.000 7.440 Segment 1 Reach 2 Waste 0.016 45.000 90.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.050 2.000 1.000 7.440 Segment 1 Reach 3 Waste 0.419 30.000 27.000 5.000 Tributary -0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 4 Haste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 5 Waste 0.000 0.000 0.000 O.D00 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 6 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 * Runoff flow is in cfs/mile 0.00 0.00 0.00 0.00 0.00 0.00 ---------- MODEL RESULTS Discharger CLEVELANDWWTP Receiving Stream THIRD CREEK ----------------------------------------------- The End D.O. is 7.49 mg/l. The End CBOD is 4.79 mg/l. The End NBOD is 1.39 mg/l. ----------------------------------------------- SUPM7ER D' 1f V LY'V ------------------ WLA WLA WLA DO Min CBOD NBOD DO (mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) Segment 1 6.43 0.00 1 Reach 1 24.00 9.45 5.00 Reach 2 45.00 90.00 0.00 Reach 3 19.00 17.00 5.00 Reach 4 0.00 0.00 0.00 Reach 5 0.00 0.00 0.00 Reach 6 0.00 0.00 0.00 Waste Flow (mgd) 6.00000 0.01000 0.40000 0.00000 0.00000 0.00000 *** MODEL SUMMARY DATA - Subbasin 30706 Discharger Ci,EVELANDWIITP Stream Class C Receiving Stream THIRD CREEK winter 7010 24.10 Summer 7Q10 14.00 Design Temperature: 25.0 LENGTH SLOPE VELOCITY DEPTH Kd Kd Ka Ka KN KN KNR KNR SOD SOD mile ft/mi fps ft design 920* design @20 design 020 design-- design 020 --- -- ------------------------------------ 0,94 0.30 0.44 D.00 0.00 0.00 Segment 1 2.30 5.22 0.422 1.89 0.30 0.23 3.19 2.86 Reach ------- ------------------------ ---------- 1 7.90 5.22 0.405 1.95 0.29 0.23 3.06 2.75 0.49 0.30 0.44 0.00 0.00 0.00 Segment , Reach ----------------^---------- ---------------- ------------^---------- 0.00 -------------------------^---^- Segment 1 3.28 4.82 0.392 2.02 0.29 0.23 2.74 2.45 0.44 0.30 0.44 0.00 0.00 Reach3 --------------------------------- ---^---^----------------------- ----------------- -------------------- - Segment 1 4.25 2.35 0.317 2.25 0.27 0.21 2.08 0.97 0.44 0.30 0.44 0.00 0. Reach------------------ ----------------------------------- 1 0.20 50.00 0.772 1.45 0.65 0.52 55.75 50.00 0.73 0.50 0.73 0.00 0.00 - 00 Segment Reach ------------------------------------- 0.44 00 ' Segment 1 0.80 4.35 0.380 2.06 0.28 0.23 2.39 2.15 0.99 0.30 0.44 O.aO Reach 6 ---------------- ------------------------------------------------------------- Flow CBOD NBOD D.O. cfs mg/1 mg/1 mg/1 Segment 1 Reach 1 Waste 9.300 24.000 9.450 5.000 Headwaters 13.200 2.000 1.000 7.440 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.170 2.000 1.000 7.440 Segment 1 Reach 2 Waste 0.016 45.000 90.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.050 2.000 1.000 7.440 Segment 1 Reach 3 Waste 0.620 19.000 17.000 5.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 4 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 -7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 5 Waste 0.000 0.000 O.OaO 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 6 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 * Runoff flow is in cfs/mile SUMMER ---------- MODEL RESULTS --- Discharger CLEVELANDWWTP Receiving Stream THIRD CREEK -------------------------------------------------- The End D.O. is 6.84 mg/l. The End CBOD is 5.77 mg/l. The End NBOD is 1.69 mg/l. ---------------------------------------------------------------------- WLA WLA WLA DO Min CBOD NBOD DO Waste Flow (mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) (mgd) ---------- Segment ---------------------- 1 5.77 17.50 ---- 4 ---- -- Reach 1 24.00 9.45 5.00 8.00000 Reach 2 45.00 90.00 0.00 0.01000 Reach 3 19.00 17.00 5.00 0.40000 Reach 4 0.00 0.00 0.00 0.00000 Reach 5 0.00 0.00 0.00 0.00000 Reach 6 0.00 0.00 0.00 0.00000 *** MODEL SUMMARY DATA *** Subbasin 30706 Discharger CLEVELANDYiViTP Stream Class C Receiving Stream THIRD CREEK Winter 7010 24.10 Summer 7Q10 14.00 Design Temperature: 25.0 LENGTH SLOPE VELOCITY DEPTH Kd Kd Ka Ka KN KN KNR KNR SOD SOD mile ft/mi fps ft design @206 design @20* 'design @20* ---design- @200 -- design 020* ---- ---^-------------- --------------------------------^-- -» 0.00 Segment 1 2.30 5.22 0.464 1.92 0.30 0.24 2.38 2.13 0.44 0.30 0.99 0.00 0.00 Reach--------------------------- -------------------------------------------- ----^-------^--------------- 0.00 0.445 1.98 0.30 0.23 2.28 2.09 0.44 0.30 0.44 0.00 0.00 Segment 1 T.90 �.22 Reach 2 ----- ------------------ -------------------------^----- ------------^»----^- 0.29 0.23 2.03 1.82 0.44 0.30 0.44 0.00 0.00 0.00 Segment 1 3.28 4.82 0.929 2.05 Reach 3 ----------------------- 00 0.27 0.22 0.80 0.T2 0.44 0.30 0.44 0.00 0.00 0. Segment 1 9.25 2.35 0.347 2.29 Reach--------------------------- 0.00 - --------------------------------------------------------------- --------------------------------------- 1 0.20 50.00 0.845 1.47 0.69 0.54 41.44 37.16 0.73 0.50 0.73 0.00 0.00 Reach --------------------------- -----------------------------^------- Segment ^- 1.59 0.44 0.30 0.44 0.00 0.00 0.00 1 0.80 4.35 0.415 2.10 0.29 0.23 1.77 Reach6 -------------------------- ----------------------- Flow CBOD NBOD D.O. cfs mg/l mg/1 mg/l Segment 1 Reach 1 Waste 12.400 24.000 9.450 5.000 Headwaters 13.200 2.000 1.000 7.440 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.170 2.000 1.000 7.440 Segment 1 Reach 2 Waste 0.016 45.000 90.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.050 2.000 1.000 7.440 Segment 1 Reach 3 Waste 0.620 19.000 17.000 5.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 4 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 5 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 6 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 * Runoff flow is in cfs/mile SUMMER 0-� ---------- MODEL RESULTS Discharger CLEVELANDWWTP Receiving Stream THIRD CREEK ----------------------------------------------- The End D.O. is 7.50 mg/l. The End CBOD is 4.76 mg/l. The End NBOD is 1.39 mg/l. WLA WLA WLA DO Min CBOD NBOD DO (mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) Segment 1 ---------------------- 6.43 0.00 1 ---- ---- Reach 1 24.00 9.45 5.00 Reach 2 45.00 90.00 0.00 Reach 3 15.00 14.00 5.00 Reach 4 0.00 0.00 0.00 Reach 5 0.00 0.00 0.00 Reach 6 0.00 0.00 0.00 Waste Flow (mgd) 6.00000 0.01000 0.50000 0.00000 0.00000 0.00000 *** MODEL SUMMARY DATA *** Discharger CLEVELANDWWTP Subbasin 30706 Receiving Stream THIRD CREEK Stream Class C SWinter 7010 24.10 Summer 7010 14.00 Design Temperature: 25.0 LENGTH SLOPE VELOCITY DEPTH Kd Kd Ka Ka KN KN KNR KNR SOD SOD mile ft/mi fps ft design @20* design @20* design @20* design @20* design @20* _ -------------------------------------------- Segment 1 2.30 5.22 0.422 1.B9 0.30 0.23 3.19 2.86 0.44 0.30 0.44 0.00 0.00 0.00 Reach 1 Segment 1 7.90 5.22 0.405 1.95 0.29 0.23 3.06 2.75 0.44 0.30 0.44 0.00 0.00 0.00 Reach 2 Segment - 1 3.28 4.82 0.394 2.02 0,29 0.23 2.75 2.47 0.99 0.30 0.99 0.00 0.00 0.00 Reach 3 Segment 1 4.25 2.35 0.319 2.25 0.27 0.21 1.09 0.97 0.44 0.30 0.44 0.00 0.00 0.00 Reach 4 Segment 1 0.20 50.00 0.775 1.45 0.66 0.52 55.75 50.00 0.73 0.50 0.73 0.00 0.00 0.00 Reach 5 -------------------------------------------- Segment 1 0.80 4.35 0.381 2.07 0.28 0.23 2.40 2.16 0.44 0.30 0.44 0.00 0.00 0. 00 Reach 6 Flow CBOD NBOD D.O. cfs mg/1 mg/1 mg/1 Segment 1 Reach 1 Waste 9.300 24.000 9.450 5.000 Headwaters 13.200 2.000 1.000 7.440 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.170 2.000 1.000 7.440 Segment 1 Reach 2 Waste 0.016 45.000 90.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.050 2.000 1.000 7.440 Segment 1 Reach 3 Waste 0.775 15.000 14.000 5.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 4 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 5 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 6 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 * Runoff flow is in cfs/mile SUMMER ---------- MODEL RESULTS ---------- Discharger CLEVELANDWWTP Receiving Stream THIRD CREEK --------------------------------------------------------- The End D.O. is 6.85 mg/l. The End CBOD is 5.74 mg/l. The End NBOD is 1.70 mg/l. --------------------------------------------------------- C� .S S �.� WLA WLA WLA DO Min CBOD NBOD DO Waste Flow (mg/1) Milepoint Reach # (mg/1) (mg/1) (mg/1) (mgd) Segment 1 5.78 17.50 4 Reach 1 24.00 9.45 5.00 8.00000 Reach 2 45.00 90.00 0.00 0.01000 Reach 3 15.00 14.00 5.00 0.50000 Reach 4 0.00 0.00 0.00 0.00000 Reach 5 0.00 0.00 0.00 0.00000 Reach 6 0.00 0.00 0.00 0.00000 r • t *** MODEL SUMMARY DATA *** Discharger CLEVELANDWWTP Subbasin 30706 Receiving Stream THIRD CREEK Stream Class C Summer 7010 14.00 Winter 7010 24.10 Design Temperature: 25.0 LENGTH SLOPE VELOCITY DEPTH Kd Kd Ka Ka KH KN KNR KNR SOD SOD mile ft/mi fps ft design 020* design @20' design @20* design @20* --- design @20' --------------------- --------------------- --------------- Segment 1 2.30 5.22 0.464 1.92 0.30 0.24 2.36 2.13 0.94 0.30 0.99 0.00 0.0 Reach 1 -------------- -------------------------------------^- Segment - 1 7.90 5.22 0.445 1.98 0.30 0.23 2.28 2.04 0.44 0.30 0.44 0.00 0.0 Reach 2 --- __ Segment---- 1 3.28 4.02 0.431 2.05 0.29 0.23 2.04 1.83 0.44 0.30 0.44 0.00 0.0 Reach 3------- --------------- ----------------- ------------------- Segment 1 4.25 2.35 0.349 2.29 0.27 0.22 0.80 0.72 0.44 0.30 0.44 0.00 0. 00 Reach 4 ---- --- --------------------------------------- Segment - 1 0.20 50.00 0.848 1.47 0.69 0.55 41.61 37.32 0.73 0.50 0.73 0.00 0.0 Reach5 --------------------------- -------------^----------------------- Segment----- 1 0.80 4.35 0.417 2.30 0.29 0.23 1.78 1.60 0.99 0.30 0.44 0.00 0.0 _-Reach-^-----------6----------------------------------^------------------------------------------- ---------------------------- Flow CBOD NBOD D.O. cfs mg/1 mg/1 mg/l Segment 1 Reach 1 Waste 12.400 24.000 9.450 5.000 Headwaters 13.200 2.000 1.000 7.440 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.170 2.000 1.000 7.440 Segment 1 Reach 2 Waste 0.016 45.000 90.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.050 2.000 1.000 7.440 Segment 1 Reach 3 Waste 0.775 15.000 14.000 5.000 Tributary 0.000 2.000" 1.000 7.440 ■ Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 4 , Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 5 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 Runoff 0.040 2.000 1.000 7.440 Segment 1 Reach 6 Waste 0.000 0.000 0.000 0.000 Tributary 0.000 2.000 1.000 7.440 * Runoff 0.040 2.000 1.000 7.440 * Runoff flow is in cfs/mile 0.00 0.00 0.00 0.00 0.00 0.00 Town of Cleveland 302 East Main Street P.O. Box 429 Cleveland, NC 27013 (704)278-4777 September 7, 2017 Ms. Julie Grzyb, Supervisor NPDES Complex Permitting Unit 1617 Mail Service Center Raleigh, NC 27699-1617 RE: Speculative Limits for WWTP Expansion Town of Cleveland Wastewater Treatment Plant NPDES Permit No. NCO049867 Dear Ms. Grzyb: RECENEDINCDEO]DWR SEP 2 2 Z017 Water QuaMi permitUn9 section The Town of Cleveland, North Carolina in Rowan County is assessing its wastewater treatment plant (WWTP) as part of a process to prepare for the potential addition of new local industries and the consolidation of two elementary schools in the area. The WWTP plant operates under NPDES permit No. NC NC0049867. The existing permitted monthly average WWTP discharge is 0.27 MGD and the effluent limits are summarized below in Table 1. Please also see the attached Quadrangle maps showing the location of the WWTP site, Third Creek, and the general surrounding area. The purpose of this letter is to request speculative limits for an NPDES discharge of 0.40 MGD and 0.50 MGD. V Table 1: Existing Cleveland WVVTP Permitted Effluent Limits LIMITS MONIMIRtINGREQUIREMENTS Monthly Weekly Daily Measurement 93mpleType sample 8:FWENTCHARACTEMS'TIC8 Units Average Average Maximum Frequency Location Flow MGD 027 Continuous I or E SOD, 5 day, 20°C -Recording (April 1 to October31)2 mg/L 15 22S Weekly Composite I,E SOD, 5 day, 20°C (November 1 to March 31) 2 mg/L 30 45 Weekly Composite I, E NH3 as N (April 1 to October 31) mg1L 6 18 Weekly Composite E NH3 as N November 1 to March 31 mg/L 12 35 Weekly Composite E Total Suspended Solids? mglL 30 45 Weekly Composite I, E Dissolved Oxygen3 Weekly Grab I, U. D Fecal Coliform (geometricmean count per 100 200 400 Weekly Grab E, U. D Total Residual Chlorine° pg/L 28 2 per week Grab E Oil and Grease Weekly Grab E Total Nitrogen (NO2 + NO3 + TKN) Monthly Composite E Total Phosphorus Temperat ure °C Monthly Composite E Tem ature°C Weekly Day Grab Grab U, D E H5 Conductivlt Weekly Grab E ChronicToxicit s Weelcl Grab U D Effluent Pollutant Scan Quarterly Composite E Footnote? 1 Footnote? 1.) I = influent, E= effluent, U= upstream at [east 100 feet upstream from the discharge polnt, D= downstream at NCSR 1003. Effluent Upstream and downstream samples shall be grab samples. Instream monitoring requirements are waived conditional upon membership in the YPDRSA See condition A (4.). 24 The monthly average SOD and Total Suspended Solids concentrations shall not exceed 15%oft he respective influent values (85%removal ). 3) The daily average dissolved oxygen effluent concent rations shall not be less than 5.0 mg/L. 4.) The Division shall consider all effluent TRC values reported below 50 µg/L to be in compliance with the permit. However, the Fermittee shall eontinueto record and submit all values reported by a North Carolina certified laboratory (including 50 pg1L. field certified), even if these valuesfall below 5) The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units. 6.) ChronlcToxicity (Ceriodaphnia) P/ Fat 3.OW March, June, September, and December (see condition A. (2.)). 7) The permittee shall perform three Effluent Pollutant Suns during the term of this permit [seeA. (3)]. 84 No later than 270 days from the effective date of this permit, begin submitt ing discharge monitoring reports electronically using NC DWITs eDMRapplication stem. See SbedalCondition Af51 It is anticipated that the discharge point into Third Creek for the expanded WWTP will remain at or near the current permitted location. A United States Geological Survey (USGS) streamgage (Station Number 02120500) is located just upstream of the discharge point for the Cleveland WWTP at approximately 35.74875 N, 80.68375 W. Refer to the attached Quadrangle and Street maps for the streamgage's location relative to the Cleveland WWTP. Unfortunately, this streamgage was only active between April,1940 and September,1971, and is the only streamgage with data for Third Creek. There are three active streamgages on other streams near the site that have been active since 2012, however, the data from these gages may not be used exclusively to estimate low -flow data for the WWTP discharge point at Third Creek. Based on counsel from USGS scientists we are providing the published low flow characteristics from the discontinued streamgage on Third Creek. Low -flow characteristics for Third Creek are summarized in Table 2 Below. Table 2: Low -Flow Characteristics for Third Creek streamgage (Station Number 02120500) Low -Flow Characteristic Value Drainage Area 87.4 square miles Annual Summer 7Q10 Discharge 16 cis = 0.18 cis per 87.4 square miles Annual Winter 7Q10 Discharge 27 cfs = 0.31 cis per 87.4 square miles Annual 30Q2 Discharge 33 cfs = 0.38 cis per 87A square miles Average Annual Discharge 91 cfs = 1.04 cfs per 87.4 square miles Minimum Daily Discharge (9/18/1956) 10 cis = 0.11 cfs per 87.4 square miles Maximum Daily Discharge (9/19/1945) 2 500 cfs = 28.6 cis per 87.4 square miles Summer 7Q10: 7-day,10-year low flow discharge 7Q2: 7-day, 2-year low flow discharge 30Q2: 30-day, 2-year low flow discharge Winter 7Q10: 7-day, 10-year low flow discharge Sources: (1) USGS Stream Stats, httip:lLwater.usas.gov/oswLstreamstats/north carolina html (2) USGS, "Low -flow characteristic in North Carolina", http://pubs usas cloy/wsp/2403/report[df (3) USGS, "Low -flow characteristics and flow -duration statistics for selected USGS continuous -record strearngaging stations in North Carolina through 2012", htt : ubs.us s. ov sir 2015 5001 If you have any questions about this matter or if you require additional information, please contact Clark Maness of WithersRavenel at (919)535-5213. Sincerely, ^^ P Danny Gabriel Mayor Enclosure Cc: Michael R. Koser, PE, WithersRavenel Michael C. Wicker, PE, WithersRavenel J. Clark Maness, EI, WithersRavenel — USGS Streamgage 02120500 Legend r Stream Cleveland City Limit Wastewater Treatment Plant 41 Cleveland, NC00 ,�� •_'' a Wastewater , i ) 1' •; L ",r 1 ! Treatment Plant 40 WithersRavenel `• - '"" 1/ Engineers I Planners ors - \ • . �` • �/ r/ -Jj� 115 MacKenan DrlCary NC, C,275127511 ��\) �- t • -•• •• / �rr11!%%%� • it:919 469.3340 'ri -� _ _ •• V • •.. - �"� license# C-0832 ' / r • • - • uwr Mthersravenel.com `• ./ % 1 ,�, _ i • •• V� • `_ `\ - - - • • L\ 0 500 1,000 2,000 �� / �`?�� I • T • • 1. Feet • / ^�- r • '%� ti rtC�� .`-u� ^�' - �' 1 inch = 1,000 feet - �•w �.ft i • ,�.-.. - s • • 1 Path:\\wrcorp-file0l\K\16\16-0400\160407-Cleveland WWTP Review\GIS\Cleveland WWTP.mxd Printed Date: 9/6/2017 Created BY: GWS a Legend 'IV Stream USGS Streamgage 02120500 a i Cleveland City Limit Cleveland, NC Wastewater Treatment Plant %0 WithersRavenel Engineers I Planners I Surveyors 115 MacKenan Dr I Cary NC. 27511 t: 919.469.3340 license M: C M32 w.w...vrtnersrnvcncl com 0 500 1,000 2,000 Feet 1 inch = 1,000 feet rbJ �. �„ Wastewater Treatment Plant Cleveland -AV, 1 "_017 cica[edC,/ GAN5 Path_\\wrcoro-file0l\K\16\16-0400\160407-Clevel