WQ0000798_Staff Report_20240906

Docusign Envelope ID: 4F4DC3F3-FC47-4EB4-AF2D-E822EB4D2BA4
It :A
Environmental
Quality
To: ❑ NPDES Unit 71 Non-Dischar;e Unit
Attn: Elton Luong
From: Bryan Lievre
Wilmington Regional Office
State of North Carolina
Division of Water Resources
Water Quality Regional Operations Section
Staff Report
Application No.: WQ0000798
Facility name: Shallotte WWTF
Note: This form has been adapted from the non -discharge facilitv staff report to document the review of both non -
discharge and NPDES permit applications and/or renewals. Please complete all sections as thev are applicable.
I. GENERAL AND SITE VISIT INFORMATION
1. Was a site visit conducted? ® Yes or ❑ No
a. Date of site visit: 9/4/2024
b. Site visit conducted by: Brvan Lievre
c. Inspection report attached? ® Yes or ❑ No
d. Person contacted: Matthew Henry and their contact information: (910) 231 - 8646 ext.
e. Driving directions: 349 Forest Street Extension, Shallotte, Brunswick Countv, NC 28470. From Wilmington:
Take US Hwv 17 South to the Shallotte area and make a right onto Frontage Rd NW, which will become Forest
St Extension after you round a bend to the right and the facilitv will be on the left.
2. Discharge Point(s): NA (Svrav Fields)
Latitudz:
Tic:
3. Receiving stream or affected surface waters: NA
River- Basin d F/a?�a1n No.
rnnalm uz
H. PROPOSED F A C 7 !T!ES! NEW APPLICATIONS
1. �z�'/.lit..Qassifieation: 'Please t+ t, ,l Moto rating sheetto bert l o lissued.o ;t\
-Proposedflow:
rs7 ❑ V8s OF E] NE)
If n:
3. Afe site eenditions (soils, depth to wa4ef table, ete) eensisteffttk tke-c-uSmit4ed r-epefts? ❑ Yeo ❑ mo ❑ 1`1,1A
if no, jnr)z in:
4 Do j p!ail.,--xi site m o 0 en4 the aetu l site (p-ep r., HMO, Wells, et,.)? I —I YeS I —I N I —I RT/A
if no, please-mp�ain:
`. la ON rrapese sidual� r gema�ltr�Jran ado .,te? E] Yes n No E N,L
if r inr)yain:
FORM: WQROSSR 04-14 Page 1 of 6

Docusign Envelope ID: 4F4DC3F3-FC47-4EB4-AF2D-E822EB4D2BA4
o no pAcpozed applieatien r-ates-(e.g., hydiwa?.j, -. W,4 ,r t� azWe , 'o? ❑ Yes E No n
if ne lease-mr)2airx
7. Afe there any sethaek eenfliets for- proposed tfeatment, storage and disposal sites? El caor❑Na
1f*&-,-onplain and r„ tc n-.,_-niteFiffg-pf &gam:
°. Fer- r-esidua, will zaas r.,lor- «ho.- rest .,bons be -ed? E] Yes n N E] NI n
if yes, attatrttzlist of sites with foC%r.�jtiionz (GeAi fie fie 4
Deser-i e the r s dualo han4h*g-af4-fft1limtion ashemei
III. EXISTING FACILITIES: MODIFICATION AND RENEWAL APPLICATIONS
1. Are there appropriately certified Operators in Charge (ORCs) for the facility? ® Yes ❑ No ❑ N/A
ORC: Christian Robert Coddinaton Certificate #: SI 1010627
Backup ORC: Ricky Ferris Babson Certificate #:SI 992603
2. Are the design, maintenance and operation of the treatment facilities adequate for the type of waste and disposal
system? ® Yes or ❑ No
If no, please explain:
Description of existing facilities: A 500,000 wd wastewater treatment and irrigation facility with two facultative
lagoon systems.
The first and older 175,000 ud facultative lagoon system is equipped with an influent surge basin with Parshall
Flume and flow meter, dual 2.75-acre clay lined lagoons (i.e., Lagoon 1 & 2), dual manually cleaned coarse
screens, a fine spin filter, gas chlorine, an effluent wet well with duplex 400 win pumps, an effluent flow meter
and 40.8 acres of sprav fields (Fields 1A, 113, 2A, 213, 9, 10, 11 & 12).
The second and "newer" 325,000 2Dd facultative lagoon system (i.e., Lagoon 3) is equipped with an influent flow
meter, an 11.6-acre HDPE lined lagoon, a trash screen, chlorine disinfection system, an irrigation pump station
with duplex 820 apm pumps and strainers, an effluent flow meter and 93.4 acres of spray irriaation fields (Fields
3, 4, 5, 6, 7, 8 & 13).
It should be noted that the system has received approval for and is in the process of performing up2_rades to the
system alona with the installation of another WWTP at the site called the Mulberry Branch WRF. The Shallotte
WWTF and the Mulberry Branch WRF will share a headworks station and have their own influent pump stations,
as noted below:
o A 1.25 MGD Headworks Station with:
• One 2,558 gallon Combination Box (aka Mixing Well) with influent autosampler,
• One 1.25 mad rotary drum screen with manual bypass bar screen;
• One manual bypass bar screen with 1" oveninas;
• An odor control system,
• A a_ rit removal chamber with 1.25 mad stacked tray grit removal system and,
- 250 2nm at 11.2 ft TDH submersible average flow operating_ pump;
- 160 gpm at 18.6 ft TDH submersible low flow sump pump;
o One 43,188 aallon Influent Pump Station with:
• Pump Station No. 1 with pumps to the Shallotte WWTP (W00000798), including:
- One 300 2Dm at 32.4 ft TDH low flow pump;
- Two 1,650 apm at 47.4 ft TDH peak capacity pumps;
- One magnetic in -line flowmeter:
FORM: WQROSSR 04-14 Page 2 of 6

Docusign Envelope ID: 4F4DC3F3-FC47-4EB4-AF2D-E822EB4D2BA4
hi order to accommodate the new Headworks Station, snrav irrigation Fields IA and 1B were nronosed to be
removed and Field 14 was to be added to replace the capacity of the removed fields. Also, Lagoons 1 & 2 were
nronosed to be connected with a connecting concrete channel and a nine was proposed to be installed to connect
Lagoon 2 to 3 to take out the snrav field numn station for the first (or older) facultative lagoon system.
Proposed flow: 500,000 2Dd
Current permitted flow: 500,000 2Dd
Explain anything observed during the site visit that needs to be addressed by the permit, or that may be important
for the permit writer to know (i.e., equipment condition, function, maintenance, a change in facility ownership,
etc.) Operations and ownership has been transferred to Brunswick Countv
3. Are the site conditions (e.g., soils, topography, depth to water table, etc) maintained appropriately and adequately
assimilating the waste? ® Yes or ❑ No
If no, please explain:
4. Has the site changed in any way that may affect the permit (e.g., drainage added, new wells inside the compliance
boundary, new development, etc.)? ❑ Yes or ® No
If yes, please explain:
5. Is the residuals management plan adequate? ® Yes or ❑ No
If no, please explain:
6. Are the existing application rates (e.g., hydraulic, nutrient) still acceptable? ® Yes or ❑ No
If no, please explain:
7. Is the existing groundwater monitoring program adequate? ® Yes ❑ No ❑ N/A
If no, explain and recommend any changes to the groundwater monitoring program:
8. Are there any setback conflicts for existing treatment, storage and disposal sites? ❑ Yes or ® No
If yes, attach a map showing conflict areas.
9. Is the description of the facilities as written in the existing permit correct? ® Yes or ❑ No
If no, please explain:
10. Were monitoring wells properly constructed and located? ® Yes ❑ No ❑ N/A
If no, please explain:
11. Are the monitoring well coordinates correct in BIMS? ® Yes ❑ No ❑ N/A
If no, please complete the following (expand table if necessary):
Monitoring Well Latitude Longitude
12. Has a review of all self -monitoring data been conducted (e.g., DMR, NDMR, NDAR, GW)? ® Yes or ❑ No
Please summarize any findings resulting from this review: Upon review of NDMR, NDAR and GW records, the
system has not been issued any violations since the submittal of the prior staff report dated 8/11/2021. It should
be noted that two monitoring wells NW-6 & MW-10) have intermittently exceeded the limit for nitrogen and
WiRO is aware of these exceedances and is keening an eve on trends.
Provide input to help the permit writer evaluate any requests for reduced monitoring, if applicable.
13. Are there any permit changes needed in order to address ongoing BIMS violations? ❑ Yes or ® No
If yes, please explain:
14. Check all that apply:
® No compliance issues ❑ Current enforcement action(s) ❑ Currently under JOC
❑ Notice(s) of violation ❑ Currently under SOC ❑ Currently under moratorium
Please explain and attach any documents that may help clarify answer/comments (i.e., NOV, NOD, etc.)
FORM: WQROSSR 04-14 Page 3 of 6

Docusign Envelope ID: 4F4DC3F3-FC47-4EB4-AF2D-E822EB4D2BA4
If the facility has had compliance problems during the permit cycle, please explain the status. Has the RO been
working with the Permittee? Is a solution underway or in place?
Have all compliance dates/conditions in the existing permit been satisfied? ❑ Yes ❑ No ❑ N/A
If no, please explain:
15. Are there any issues related to compliance/enforcement that should be resolved before issuing this permit?
❑ Yes ®No❑N/A
If yes, please explain:
16. Possible toxic impacts to surface waters: NA
17. Pretreatment Program (POTWs only): NA
FORM: WQROSSR 04-14 Page 4 of 6

Docusign Envelope ID: 4F4DC3F3-FC47-4EB4-AF2D-E822EB4D2BA4
IV. REGIONAL OFFICE RECOMMENDATIONS
1. Do you foresee any problems with issuance/renewal of this permit? ❑ Yes or ® No
If yes, please explain:
2. List any items that you would like the NPDES Unit or Non -Discharge Unit Central Office to obtain through an
additional information request:
Item
Reason
3. List specific permit conditions recommended to be removed from the permit when issued:
Condition
Reason
4. List specific special conditions or compliance schedules recommended to be included in the permit when issued:
Condition
Reason
1 Sludge measurements in the lagoons please refer to Section V.
5. Recommendation: ❑ Hold, pending receipt and review of additional information by regional office
❑ Hold, pending review of draft permit by regional office
❑ Issue upon receipt of needed additional information
® Issue
❑ DrF'1qA4'
bg, date reasons: )
6. Signature of report preparer: L:.cwu
Signature of regional supervisor. BAFssoz3,BDDaz&... I( Scwi,G6/'-_�Al"
Date: 9/6/2024 `HABAUA=C434...
FORM: WQROSSR 04-14 Page 5 of 6

Docusign Envelope ID: 4F4DC3F3-FC47-4EB4-AF2D-E822EB4D2BA4
V. ADDITIONAL REGIONAL STAFF REVIEW ITEMS
This staff report is being provided in response to a permit renewal application dated July 3, 2024.
It is the desire of WiRO staff that this facility as well as all facilities with lagoons and storage basins have a
requirement to measure sludge levels on a regular basis. Although there does not seem to be federal or state standards
for the frequency of measuring sludge in lagoons, WiRO staff recommend that for this project Lagoon 1 be assessed
for sludge content yearly and the other lagoons be assessed at least every 5 years.
FORM: WQROSSR 04-14 Page 6 of 6