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Home My WebLink AboutNC0085812_Short Term Monitoring Plan_20191218 Public Works 4600 Goldmine Rd Monroe NC 28110 Union County T. 704-289-1434 II I www.unioncountync.gov EST. 1842 December 18, 2019 ','E VED Monti Hassan JAN 0 3 2020 PERCS Unit Pretreatment Coordinator NCDEC/DWR/NPDES 1617 Mail Service Center Raleigh, NC 27699-1617 Subject: Approval of LTMP's & STMP; Union County Dear Mr. Hassan, In the interest in obtaining necessary data prior to requesting the full approval of Union County's Pretreatment Program; Union County would like to request approval of the attached LTMP's for Twelve Mile WRF & Crooked Creek LTMP along with the STMP for Grassy Branch WRF. The additional data required within these plans will allow for a clearer evaluation of our uncontrollable pollutant levels throughout our Collection System & Industrial baselines/contributions. The data collected will allow for more accurate calculations of our Headworks Analysis, and allocation tables. Please contact Katie Fleming 980-425-0735; kate.fleminq(u�unioncountync.gov , Union County Industrial Pretreatment Program Manager with any questions, concerns, or corrections. Thank you. Sincerely, &Aieet- Andrew Neff, PE Union County Public Works Water/Wastewater Division Director, Union County Public Works CC: Hyong Yi, UCPW Administrator Bart Farmer, WRF Superintendent Kate Fleming, Industrial Pretreatment Program Manager E�Gj'Lj` yaLv ''�H QG °9Ty,..CpPo) Short Term Monitoring Plan Union County Public Works Grassy Branch Wastewater Treatment Plant NC0085812 December 2019 Revision 1: Revision 2: Revision 3: Union County Public Works Short Term Monitoring Plan—Grassy Branch WWTP A. Sampling Points(See Figure 1) 1. Influent(sample point 1): prior to mixing with recycle streams a. Regular composite sample collected for NPDES monitoring. 2. Effluent(sample point 2): after all treatment including chlorination a. Regular composite sample collected for NPDES monitoring 3. Activated Sludge Basin(sample point 3): a. Collect grab samples from mixed liquor influent and effluent distribution boxes 4. Sludge to Disposal(sample point 4): sample sludge going to final disposal a. Collect grab sample 5. Uncontrollable: locations in collection system that serve residential and commercial development a. Collect grab samples at GrassyBranch(MH-2723) P 6. Note: The Grassy Branch WWTP consists of solely domestic contribution;therefore, SIU sampling is not included in this monitoring plan. B. Pollutants of Concern(POCs) 1. NPDES permit requirements—biochemical oxygen demand(BOD),total suspended solids(TSS), ammonia(NH3-N),total Kjeldahl nitrogen(TKN),nitrite(NO2),nitrate(NO3),total phosphorus (TP). 2. Headworks analysis required—BOD, TSS,NH3-N,TKN,NO2,NO3,TP,nickel(Ni),copper(Cu), zinc(Zn),cadmium(Cd), chromium(Cr),cyanide(CN), lead(Pb),mercury(Hg), silver(Ag),and arsenic(As). 3. For land application 40 CFR 503 pollutants—As,Cd,Cr,Cu,Pb,Hg,molybdenum(Mo),Ni, Se,Zn, %solids,and sludge to disposal flow. 4. EPA required—Cd,Cr,Cu,Ni, Pb and Zn. 5. Additional monitored pollutants of concern—total oil and grease(HEM)and total petroleum hydrocarbon(SGT-HEM). C. Detention Times Detention time is not considered in this program. The influent and effluent samples are taken on the same day and time for unpaired data for use in the headworks analysis. D. Flow Flow monitoring points are indicated on the attached map. Flow will be monitored during sampling events or calculated. Grassy Branch STMP Page 2 Union County Public Works Short Term Monitoring Plan—Grassy Branch WWTP E. Sample Frequency and Plan Aeration Basin Sludge to Uncontrollable Pollutant of Influent(1)and Effluent(2) (3) Disposal (4) i (5) Concern Year 1 Year 2,3,4 Year 5 Years 1-5 Years 1-5 Years 1-5 QuarterlyQuarterly Arsenic(As) Quarterly1/year Per 503 1/6 months Q Y Y Cadmium(Cd) Quarterly Quarterly Quarterly 1/year Per 503 1/6 months Chromium(Cr) Quarterly Quarterly Quarterly 1/year Per 503 1/6 months Copper(Cu) Quarterly Quarterly Quarterly 1/year Per 503 1/6 months Lead(Pb) Quarterly Quarterly Quarterly 1/year Per 503 1/6 months Mercury(Hg) Quarterly Quarterly Quarterly 1/year Per 503 1/6 months Molybdenum(Mo) Quarterly Quarterly Quarterly 1/year Per 503 1/6 months Nickel (Ni) Quarterly Quarterly Quarterly 1/year Per 503 1/6 months Selenium(Se) Quarterly Quarterly Quarterly 1/year Per 503 1/6 months Silver(Ag) Quarterly Quarterly Quarterly 1/year Per 503 1/6 months Zinc(Zn) Quarterly Quarterly Quarterly 1/year Per 503 1/6 months Cyanide (Cn) 1/month 1/month 1/month 1/year ---- 1/6 months Flow Continuous i Continuous Continuous Continuous ---- --- BOD * Daily Daily Daily ---- ---- 1/6 months TSS * Daily Daily Daily Daily MLSS Weekly 1/6 months (/o solids) NH3-N * I/month 1/month 1/month 1/6 months ---- 1/6 months Nitrate and nitrite Quarterly Quarterly Quarterly 1/6 months ---- ---- Nitrogen,total Quarterly Quarterly Quarterly 1/6 months ---- ---- Phosphorus,total 1/month 1/month 1/month 1/6 months ---- ---- Grassy Branch STMP Page 3 Union County Public Works Short Term Monitoring Plan—Grassy Branch WWTP Aeration Basin Sludge to Uncontrollable Pollutant of Influent(1)and Effluent(2) (3) Disposal(4) (5) Concern Year 1 Year 2,3,4 Year 5 Years 1-5 Years 1-5 Years 1-5 Total oil and grease 1/year 1/year 1/year (HEM) ---- ---- ---- Total petroleum hydrocarbon 1/year 1/year 1/year ---- ---- ---- (SGT-HEM) * Daily sampling excludes weekends and holidays Grassy Branch STMP Page 4 Union County Public Works Short Term Monitoring Plan—Grassy Branch WWTP F. Detection Level and Sample Method Practical Quantitation Limits Pollutant of Concern (PQLs),mg/L Sample Method Arsenic(As) 0.01 24 hr Composite Cadmium(Cd) 0.002 24 hr Composite Chromium(Cr) 0.005 24 hr Composite Copper(Cu) 0.005 24 hr Composite Lead(Pb) 0.01 24 hr Composite Mercury(Hg) 1.0 ng/L* (Method 1631) Grab* Molybdenum(Mo) 0.01 24 hr Composite Nickel(Ni) 0.01 24 hr Composite Selenium(Se) 0.01 24 hr Composite Zinc(Zn) 0.01 24 hr Composite Silver(Ag) 0.001 24 hr Composite Cyanide(Cn) 0.01 Grab BOD 2.0 24 hr Composite TSS 2.5 24 hr Composite NH3-N 0.1 24 hr Composite TKN 0.50 24 hr Composite Nitrate and nitrite 0.10 24 hr Composite Phosphorus,total 0.10 24 hr Composite Total oil and grease(HEM) 5 mg/L Grab Total petroleum hydrocarbon 5 mg/L Grab (SGT-HEM) Sampling, preservation, and analytical method must be from 40 CFR 136. * Graphite Furnace Determinations are required to attain the desired detection level for the metals. However,analysis of aeration basin and sludge to disposal samples often cannot meet these detection levels. In this case, analysis of these samples must obtain a detection level at least as stringent as the applicable inhibition criteria or sludge ceiling standard. ** All aeration basin and sludge to disposal samples will be grab. Grassy Branch STMP Page 5 Union County Public Works Short Term Monitoring Plan—Grassy Branch WWTP G. WWTP Diagram Legend: FBW =Filter Backwash RAS =Return Activated Sludge WAS =Waste Activated Sludge It =Sampling Point 0 0 Influent Coarse Influent Equalization Flow PumpStation Aeration Basins Screens Splitter Box Splitter Box T Influent %� 4 j4 ► RAS Crooked O Tertiary Creek Filters ` , Secondary t UV Disinfection FBW RAS Pumping Pump Station • O WAS Pumping A 0104- • MO Aerated To Land Solids Holding Tank Application Figure 1 ► WWTP Process Flow Diagram Union County,NC Grassy Branch WWTP NC0085812 30831-052-001 Figure 01 Greasy Elreneltedr Grassy Branch STMP Page 6 UNION COUNTY PERSONNEL REPORT REPORT OF NEW HIRES July 2019 Name Hire Date Position 911 COMMUNICATIONS ROBERT V DALE 7/22/19 SYSTEMS SUPPORT BUDGET MARY B NAMALA 7/22/19 SENIOR BUDGET ANALYST COMMUNITY SUPPORT&OUTREACH KENNETH S PRUSIENSKY 7/8/19 SITE MANAGER RPT HEALTH KELLY E GATES 7/22/19 ASSOC PUBLIC HEALTH NURSE PT INFORMATION TECHNOLOGY IRYNA N BYCHAK 7/8/19 ADMIN SUPP SPECIALIST I PT JENNIFERANN T YU 7/8/19 ADMIN SUPP SPECIALIST I PT PUBLIC LIBRARY ZOEY E KNOX 7/8/19 LIBRARY ASSOCIATE PT STEPHANIE S WILEY 7/8/19 TRAINING &TECHNOLOGY COOR PUBLIC WORKS OPERATIONS NOAH D ASHBURNER 7/8/19 UTILITY TECHNICIAN I MARK D HARRINGTON 7/8/19 UTILITY TECHNICIAN I SHERIFF/JAIL/FACILITIES MICHAEL L AYTES 7/11/19 PT DEPUTY SHERIFF SOCIAL SERVICES RANAYDA D DRAYTON 7/22/19 SCHOOL SOCIAL WORKER JANIE M LAKEMAN 7/22/19 SENIOR SOCIAL WORKER LASHANDA M NOBLES 7/22/19 SENIOR SOCIAL WORKER MELISSA A PONTIUS 7/22/19 ELIGIBILITY SPECIALIST SOLID WASTE CALVIN W MULLIS 7/13/19 UTILITY SITE ATTENDANT PT TRANSPORTATION AIMEE C CHANEY 7/8/19 DRIVER PT DONALD WHITTINGTON 7/22/19 DRIVER PT