WQ0035049_Staff Report_20200715

DocuSign Envelope ID: E56DF092-FED6-40D8-9D51-B7D6BE4167CD
State of North Carolina
®r'. Division of Water Resources
Water Quality Regional Operations Section
Environmental Staff Report
Quality
To: ❑ NPDES Unit ® Non -Discharge Unit Application No.: WQ0035049
Attn: Poonam Giri Facility name: Maple Hill WWTF
From: Helen Perez
Wilmington Regional Office
Note: This form has been adapted from the non -discharge fg acili , staff report to document the review of both non -
discharge and NPDES permit applications and/or renewals. Please complete all sections as they are qpplicable.
I. GENERAL AND SITE VISIT INFORMATION
1. Was a site visit conducted? ® Yes or ❑ No
a. Date of site visit: 07/15/2020
b. Site visit conducted by: Helen Perez, Tyler Benson
c. Inspection report attached? ❑ Yes or ® No
d. Person contacted: Anthony Colon and their contact information: 910 - 259 ext. 1521
e. Driving directions: 306 Maple Hill School Road, Maple Hill
2. Discharge Point(s): N/A
Latitude: Longitude:
Latitude: Longitude:
3. Receiving stream or affected surface waters: N/A
Classification:
River Basin and Subbasin No.
Describe receiving stream features and pertinent downstream uses:
II. PROPOSED FACILITIES: NEW APPLICATIONS: N/A
1. Facility Classification: (Please attach completed rating sheet to be attached to issued permit)
Proposed flow:
Current permitted flow:
2. Are the new treatment facilities adequate for the type of waste and disposal system? ❑ Yes or ❑ No
If no, explain:
3. Are site conditions (soils, depth to water table, etc) consistent with the submitted reports? ❑ Yes ❑ No ❑ N/A
If no, please explain:
4. Do the plans and site map represent the actual site (property lines, wells, etc.)? ❑ Yes ❑ No ❑ N/A
If no, please explain:
5. Is the proposed residuals management plan adequate? ❑ Yes ❑ No ❑ N/A
If no, please explain:
FORM: WQROSSR 04-14 Pagel of 5

DocuSign Envelope ID: E56DF092-FED6-40D8-9D51-B7D6BE4167CD
6. Are the proposed application rates (e.g., hydraulic, nutrient) acceptable`? ❑ Yes ❑ No ❑ N/A
If no, please explain:
7. Are there any setback conflicts for proposed treatment, storage and disposal sites? ❑ Yes or ❑ No
If yes, attach a map showing conflict areas.
8. Is the proposed or existing groundwater monitoring program adequate? ❑ Yes ❑ No ❑ N/A
If no, explain and recommend any changes to the groundwater monitoring program:
9. For residuals, will seasonal or other restrictions be required? ❑ Yes ❑ No ❑ N/A
If yes, attach list of sites with restrictions (Certification B)
Describe the residuals handling and utilization scheme:
10. Possible toxic impacts to surface waters:
11. Pretreatment Program (POTWs only):
III. EXISTING FACILITIES: MODIFICATION AND RENEWAL APPLICATIONS
1. Are there appropriately certified Operators in Charge (ORCs) for the facility? ® Yes ❑ No ❑ N/A
ORC: Christopher Pickett Certificate #: 995432 Backup ORC: Salvatore
Sneziale Certificate #:12843
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:
42, 000 gallon per day (GPD) wastewater treatment and irrigation facility consisting of:
a 46,076 gallon equalization basin with two submersible 40 gallon per minute (GPM) pumps; two 8, 078
gallon aeration basins with two 2 horsepower (hp) rotating mixers; two 5, 013 gallon clarifiers with air- lift
pumps; two 200 GPM ultraviolet (UV) disinfection units; a 3,063 gallon aerobic digester with air- lift
pumps; two blowers to serve the equalization basin and digester; a 60 kilowatt (kW Generac generator; a
5. 6 million gallon spthetically lined storage lagoon; an irrigation pump station; an approximately
19 acre spray irrigation area; and all associated piping, valves, controls and appurtenances.
Proposed flow: N/A
Current permitted flow: 42,000 GPD
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.)
The facility has UV disinfection but does not have tertiary treatment and has to frequently clean the UV system.
Staff indicated future budgeting for tertiary filters.
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:
FORM: WQROSSR 04-14 Page 2 of 5

DocuSign Envelope ID: E56DF092-FED6-40D8-9D51-B7D6BE4167CD
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 necessarv):
Monitoring Well
Latitude
Longitude
0 / //
0 I II
0 / lI
0 I II
0 / //
0 I II
0 / lI
0 I II
0 / 11
0 I //
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: An NOV was issued in 01/19 for missing monitoring
reports and an NOV for some permit violations found duringan n inspection in 02/19. Since the inspection, reports
have been submitted and staff is working towards permit compliance. GW reports show no compliance issues.
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.)
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: N/A
17. Pretreatment Program (POTWs only): N/A
FORM: WQROSSR 04-14 Page 3 of 5

DocuSign Envelope ID: E56DF092-FED6-40D8-9D51-B7D6BE4167CD
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
Schedule I.1 submit
updated residual
management plan
Received updated residual management plan in March 2019.
4. List specific special conditions or compliance schedules recommended to be included in the permit when issued:
Condition Reason
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
❑ DewQcas� state reasons: )
D u igne by:
6. Signature of report preparers I 4h&x , f
Signature of regional supervisor: lDsaseaassssaee...
Date: 7/20/2020
Docu Signed by:
E3ABA14AC7DC434...
FORM: WQROSSR 04-14 Page 4 of 5

DocuSign Envelope ID: E56DF092-FED6-40D8-9D51-B7D6BE4167CD
V. ADDITIONAL REGIONAL STAFF REVIEW ITEMS
This staff report is being prepared for the renewal of Permit W00035049. There have been no changes to the facility
since last permit renewal. This facility is permitted for 42,000 gpd, but only averages 8,000-12,000 gpd. The WWTF
receives wastewater from a low pressure STEP sewer system that includes the Maple Hill Subdivision and four (4)
commercial buildings (Sewer Extension Permit W 00�35107). The facility has had operational challenges in the past
due to the unique design and the low BOD wastewater characteristics, but appears to be operating with no issues since
the last permit renewal. The facility has UV disinfection but does not have tertiary treatment and has to frequently
clean the UV system. Staff indicated future budgeting for tertiary filters.
A change is needed on Attachment A. The sample type for Total Phosphorus (00665) should be a composite, not a
FORM: WQROSSR 04-14 Page 5 of 5