The URL can be used to link to this page

Home My WebLink AboutNC0031828_Fact Sheet_20181004FACT SHEET FOR EXPEDITED PERMIT RENEWALS This form must be completed by Permit Writers for all expedited permits which do not require full Fact Sheets. Expedited permits are generally simple 100% domestics (e.g., schools, mobile home parks, etc) that can be administratively renewed with minor changes, but can include facilities with more complex issues (Special Conditions, 303(d) listed water, toxicity testing, instream monitoring, compliance concerns). Basic Information for Expedited Permit Renewals Permit Writer/Date Brianna Young 10/4/18 Permit Number NCO031828 Facility Name / Facility Class Vanceboro WWTP / WW-3 (classification updated during renewal Basin Name / Sub -basin number Neuse / 03-04-09 Receiving Stream / HUC Swift Creek / 0302020205 Stream Classification / Stream Segment C; Sw, NSW / 27-97- 0.5 Does permit need Daily Max NH3 limits? Already resent Does permit need TRC limits/language? Already resent Does permit have toxicity testing? IWC (%) if so No Does permit have Special Conditions? Yes Does permit have instream monitoring? Yes — DO & Temperature Is the stream impaired (on 303(d) list)? For whatparameter? No Any obvious compliance concerns? Yes see below Any permit mods since last permit? None stated with application, but application indicates chlorine gas used for disinfection rather than UV as permit indicates Current expiration date 4/30/2018 New expiration date 4/30/2023 Comments received on Draft Permit? Yes; See below Facility Overview: The design capacity of the treatment system is 0.30 MGD. No significant changes have been made to this facility since the last renewal. The facility consists of the following wastewater treatment units: • Manual bar screen • Grit removal • Two (2) parallel mechanically operated aerated oxidation ditches • Three (3) parallel secondary clarifiers • Tertiary sand filters • Alum feed for phosphorus removal • Polymer feed for alum sludge conditioning • Gas chlorination • Chlorine contact chamber • Dechlorination • Cascade post aeration • Automatic samplers • Flow meter • Aerobic sludge digesters • Sludge drying beds Compliance History (April 2013 to April 2018): • 1 NOD and 4 NOVs for BOD limit violations • 1 NOD and 13 NOVs for fecal coliform limit violations • 1 NOD, 8 NOVs, and 1 enforcement case for ammonia nitrogen limit violations • 2 NODS and 3 NOVs for DO limit violations • 1 NOD and 2 NOVs for total phosphorus limit violations • 1 NOV for TRC monitoring violation • 1 NOV for pH monitoring violation Mercury analysis completed 2/9/2018 — not submitted with the renewal application (which was received 12/14/2017) as required by the permit, but has been considered received for the renewal as the analysis was done within 12 months of permit expiration (permit expired 4/30/2018). COMER - Mercury, Total Grab ng/I 0.66 DLYVALUE Effluent (as Hg) - Concentration Changes from previous permit to draft: • Added eDMR language in A(1) and as A(6) • Updated outfall map • Added regulatory citations • Updated facility address on cover sheet and Supplement to Permit Cover Sheet per the renewal application • Added stream characteristics on Supplement to Permit Cover Sheet • Removed former footnote #4 stating "Total Residual Chlorine limits and monitoring requirements apply only if chlorine is used in the treatment process. See Section A. (5) for instructions should the facility's permitted UV disinfection system fail and an alternate means of disinfection is required" as renewal application indicated that gas chlorine disinfection is used. • Added "All samples shall be from a representative discharge event" under effluent table in A(1) to match language used in other permits • Updated A(2) to reflect monthly monitoring • Removed former A(5) Temporary Means of Disinfection as facility does not use UV disinfection, but uses chlorine gas disinfection Changes from draft to final: • Facility class updated from WW-2 to WW-3 per Wastewater Operator Certification Group comments (see below) • Based on new classification, the following changes were made per 15A NCAC 02B .0508: o DO upstream and downstream monitoring altered to reflect to 3/week sampling during June -September and weekly sampling October -May o DO effluent monitoring increased to 3/week o Temperature upstream and downstream monitoring altered to reflect to 3/week sampling during June -September and weekly sampling October - May o TRC monitoring increased to 3/week o pH monitoring increased to 3/week o BOD monitoring increased to 3/week o TSS monitoring increased to 3/week o NH3 as N monitoring increased to 3/week o Fecal coliform monitoring increased to 3/week Comments received on draft permit: • Maureen Kinney (Wastewater Operator Certification Group; via email 6/28/18): o Will need to be reclassified to WW-3 due to the phosphorus nutrient limit. o Maureen comments to WaRO (via email 6/28/18): I noticed this WW-2 classified facility has a Phosphorus Limit wouldn't that bump it to a WW- 3 with a nutrient limit? o WaRO response to Maureen (Robbie Bullock via email 6/28/18): That is correct. Currently, their backup is a grade 1 and he will need to be a grade 2.