WQ0006317_Staff Report_20230502

May 2, 2023
To: DWR Central Office — WQ, Non -Discharge Unit
Attn: Lauren Plummer
From: Caitlin Caudle
Winston-Salem Regional Office
State of North Carolina
Division of Water Resources
Water Quality Regional Operations Section
Staff Report
Application No.: W00006317
Facility name: Colonial Pipeline — Greensboro Junction
WWTF
Note: This form has been adapted from the non -discharge facility staff report to document the review of both non -discharge and NPDES permit applications and/or renewals. Please complete all sections as they are applicable.
I. GENERAL AND SITE VISIT INFORMATION
1. Was a site visit conducted? ❑ Yes or ® No
II. EXISTING FACILITIES: MODIFICATION AND RENEWAL APPLICATIONS
1. Are there appropriately certified Operators in Charge (ORCs) for the facility? ® Yes ❑ No ❑ N/A
ORC: Robert Wilcox Certificate #: 18600 Backup ORC: Martin Mabe Certificate #: 986608
2. Are the design, maintenance and operation of the treatment facilities adequate for the type of waste and disposal
system? ® Yes or ❑ No
Description of existing facilities: Operation of a 7,140 GPD facility with an aerated lagoon, two spray zones with
5 sprinklers and one spray zone with 6, and 6 monitoring wells.
Proposed flow: 4,904 gpd with 2.39 ac
Current permitted flow: 7,140 gpd with 3.48 ac
3. Are the site conditions (e.g., soils, topography, depth to water table, etc) maintained appropriately and adequately
assimilating the waste? ® Yes or ❑ No
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
5. Is the residuals management plan adequate? ® Yes or ❑ No
6. Are the existing application rates (e.g., hydraulic, nutrient) still acceptable? ® Yes or ❑ No
7. Is the existing groundwater monitoring program adequate? ® Yes ❑ No ❑ N/A
Remaining MWs will accurately present the remainingtwo wo spray fields.
8. Are there any setback conflicts for existing treatment, storage and disposal sites? ❑ Yes or ® No
9. Is the description of the facilities as written in the existing permit correct? ❑ Yes or ® No
If no, please explain: Permit description will have to be modified to reflect change to permitted flow, acreage,
and loss of forcemain.
10. Were monitoring wells properly constructed and located? ® Yes ❑ No ❑ N/A
11. Are the monitoring well coordinates correct in BIMS? ® Yes ❑ No ❑ N/A
12. Has a review of all self -monitoring data been conducted (e.g., AR, NDMR, NDAR, GW)? ® Yes or ❑ No
Please summarize any findings resulting from this review: No exceedances of GW limits since 3/2020.
13. Has a review of source facilities compliance history been completed (e.g., CEIs and DMRs)? ® Yes or ❑ No
14. Are there any permit changes needed in order to address ongoing BIMS violations? ❑ Yes or ® No
FORM: WQROSSR 04-14 Page 1 of 2

15. Check all that apply:
® No compliance issues
❑ Notice(s) of violation
❑ Current enforcement action(s) ❑ Currently under JOC
❑ Currently under SOC ❑ Currently under moratorium
16. Are there any issues related to compliance/enforcement that should be resolved before issuing this permit?
❑ Yes ®No❑N/A
III. REGIONAL OFFICE RECOMMENDATIONS
1. Do you foresee any problems with issuance/renewal of this permit? ❑ Yes or ® No
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
The modification application was not submitted with the application package.
Completed WWIS-06-16?
There was no engineer seal to certify the calculations, or specifications as to
how the forcemain to Z1 will be capped.
3. List specific permit conditions recommended to be removed from the permit when issued:
Condition Reason
I.1 Staff gauge has been installed.
4. List specific special conditions or compliance schedules recommended to be included in the permit when issued:
Condition
Reason
Schedule to submit
engineer certification
Should a certification be provided that Z1 be abandoned properly?
Schedule to abandon MWs
Should a schedule be provided to abandon the MWs?
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
❑ Deny
6. Signature of report preparer:
Signature of regional supervisor:
Date: 5/5/2023
state reasons: )
by:
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IV. ADDITIONAL REGIONAL STAFF REVIEW ITEMS
Since 3/2020 the SAR values have been >30. The high salt values of the effluent can impact the permeability of the
soil with extended application, and the health of vegetation. Irrigation events have been infrequent since 3/2020. The
Permittee should be mindful of the potential impacts of the high strength wastewater on the remaining spray zones if
irrigation events increase in frequency.
FORM: WQROSSR 04-14 Page 2 of 2