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Home My WebLink AboutNC0030210_Meeting Notes_20180129NPDES DOCUWENT SCANNING COVER SHEET NPDES Permit: NC0030210 Charlotte / Mallard Creek WWTP Document Type: Permit Issuance Wasteload Allocation Authorization to Construct (AtC) Permit Modification Complete File - Historical Engineering Alternatives (EAA) Meeting Notes,�-�,,. Instream Assessment (67b) Speculative Limits Environmental Assessment (EA) Document Date: January 29, 2018 This document is printed on reuse paper - iaraore any content on the reYerse side 1/29/2018 Brawwelln„a . Cald Narth Cawlina Speculative Limits Request for the CHARLOTTE Expansion of Mallard Creek WRF W TER r Meeting Purpose Introduce the project to NC DEQ Notify NC DEQ of upcoming Speculative Limits Request for 14.9 and 16 MGD Discuss NC DEQ's Methodology and Vision for New Speculative Limits Discuss project schedule i 4 The Mallard Creek WRF i r + ® f W� le �1W��y yy 'b'29/2018 NPDES Permit Fact Sheet Facility name Mallard Creek Water Reclamation Facility a. NCO030210 Charlotte Water 12400 US Highway 29 North, Mecklenburg County 12 MGD IV Mallard Creek 03-07-11 13-17-5 C 37.5 mil 0.64 cfs 2.1 cfs 2.9 cfs 41.0 cfs Existing NPDES Permit Limits (2014-2018) Parameter Fllluenl Lbnllallans Iddnitodn Aaldwmdnts Monlhly Mang.AveeaBo Weekly Daily Mulmum I&eaawaman! - Froquanry.. - Sanple Type _ Semple 1.0ca0Oe1 Flxr 12MGD Caniuoua Raw* Meuenta EIkmN COOD, 5 day r=)' LApmll1-Odaar 31 /.2m08 13 m08 29W Compna7n Inroad& E18mn1 CBOD, 5 day)2vq November 1-March 311 8.3np1 12.8m08 2MW cpnposiM InBumt& EfBueal TOW Suapodal saw 30.0 Mali 15Ama3 2AI&A Cmpwno k&"I& Elided! NW asN 1-Daaba31 I.Orial I 3eni cmw�to Elided! HHr asNNov.1-Mmch 31 2.0 &0 2AVnek Ili E8ku11 Dlemlval0a on A nseA D Grab EMmnl abobwMmygon 400/f170M.. 3M'eek Grab UpaOeam& Donrsiean Fecal CoLksm aaal 100NOOM 2AVaek Grab I Elbai TOtd Nioaan' Monlla&Repod --- MonlmrBRepoll Manwy Canpomb Fliarl TOW FIawboua Monk C-POSM ERuml Tompordual, MonlMr&FIGO011 d Daily Grab marl Taryarakae ('C)' I I aWaet Grob upair.& Do mWoam TOW 21noa MwAaB 1 Elfanl Sow. B.OeM B.O SIeMad lMb Grab Elkuent ChONcT s See Nob S. Co Effluent oolPC&ulenlScom Mails& I See COtMlbnA n 1/29/2018 Plant Operation and Performance National Association of Clean Water Agencies (NACWA) Peak Performance Awards recognize wastewater treatment professionals throughout the nation for protecting the environment and public health through outstanding treatment and discharge regulatory compliance. Mallard Creek WRF earned a Gold Award for zero permit violations in 2016. . Mallard Creek WRF has won NACWA awards for at least the last 12 years. Peak JPerformance AWARDS 5 t • . Alternatives Analysis Caldwell 1/29/2018 Alternatives to Meet 16 MGD MMF Treatment Capacity Demand Alternative 1 - Single Project Expansion to 16 MGD at MCWRF Alternative 2 - Phased Expansion first to 14.9 and then to 16 MGD at MCWRF ® Alternative 3 - Flow Conveyance above 12 MGD and up to 16 MGD to the Water and Sewer Authority of Cabarrus County's (WSACC's) Rocky River Regional WWTP a Alternative 4 - Partial Expansion to 14.9 MGD at MCWRF and Conveyance of Remaining 1.1 MGD to WSACC's Rocky River Regional WWTP Alternative 5 - Flow Conveyance above 12 MGD and up to 16 MGD to CLTWater's McDowell Creek -A =,, -tvz, Alternatives to Meet 16 MGD MMF Treatment Capacity Demand Alternative 2 - Phased Expansion first to 14.9 and then to 16 MGD at MCWRF 7 1/29/2018 Alternative 2 - Phased Expansion at MCWRF to 16 MGD Phase 1: Construct upggrades required to provide capacity to 14.9 MGD by 2023. These will allow meeting projected treatment demand through 2027. • Build new IPS with new screens for new deeper relief sewer • Expand existing IPS by 2021 until new IPS is built • Build additional offline EQ • Modify Train 3 diffuser grids Construct new blower building • Implement advanced aeration control strategies • Construct additional alkalinity storage and feed facilities • Phase 2: Construct upgrades by 2026 to provide capacity to 16 MGD. These will allow meeting demand through 2030. • Upgrade the existing blowers, their electrical, and replace underground air piping • Construct Primary Clarifier 6 and Final Clarifier 4 • Perform effluent piping improvements R 1/29/2018 Existing NPDES Permit Limits (2014-2018) Paramcter Effluent Llndlalions Manilmin, Re idmmonls MDnmly Average --. Weekly Avomgo -Dilly MaInium _ Meaewomontr Frequancy:,.. Semple LocallontFlmv 12MGD cm*U InnuonlCDOD, 5 dy (lpC)r 1-Dcbbm 3l 42mgA 8.3 Man 7lNwk Iduenl3 F:13cnnl CI300, 5 day(1gq pmwlw 1 _Merpb 31 Uno 12.5 MDR 2AYee1: [Amdd ElNed Told&Mwdad So30ar 3D.OmD1 460mD1 2Meek InAcnl6Eleucnl NPo0N 1-DdNw 31 to 30 Milk EfVmA NNtwN INN.1-Madl31 2AMgfi 6.Qmql 2AMmk I CMD.SIW El mM Dlwdvod Dag Av 50A M& DW I Grab Elluenl NINIed OWN' 31Wak Ofob upalremd flennsheam Fecd Co0lam eoD1aUlDum) 20N100m1I 400MODDd I 2Wmk Grab Eftmd Told Nilrogena MmlwdDepod MWIord Depod Ma" CumpoNb EfOwl Tdalftw phonm MwIty CampwOa EMuml Tom - alure MwW& Glw Eavl l Twoffahve r 3AVaw Glen upwemnd Dm*m Tdd aM MVAN&ROW OMMIY convolkeE01mM B&l 6.OMWD.OSwdmdLM Dal Grab I Etke C To,*. bee NDIS 6. Cnede I Eldem MOM PNdenl San MmDard 1 See Co�donA 0 1/29/2018 1993 and 2001 Wasteload Allocation Models - 1993 model report: • Basis of current limits "Mallard Creek WWTP... does not significantly affect BOD concentrations alongthe Rocky River..." • Mallard Creek actually predicted to improve DO in Rocky River • 2001 model report: • Confirmed that Mallard Creek was not predicted to cause DO exceedances • De minimis effect on tributary -driven sags downstream 10 1/29/2018 Permitting Schedule for Expansion at Mallard Creek WRF M..W D 19 110 F18 M18 A 18 M18 }18 a18 A48 S19 61 H18 D18 119 F-19 M19 A 19 MJ9 119 119 A 0 519 0.19 N-19 019 a.10 F80 M-W M90 M W Ia0 SReuIM[ive FRluent Drrao let[er DEl) flenew a ntl limi[i kwa rct EnNmnmMbl Auetlnen[ OFQRMewaM fONL kswnQ RFDFS Po[mRApvruUon OCQPMewaMOraRPem�i[ - - -- Detlgn,ATC.Uding : #jM 4 lei W6TER Brown AND Caldwell 11