NC0064416_Fact Sheet_20220720

FACT 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
Charles H. Weaver 7/20/2022
Permit Number
NC0064416
Facility Name
Cullasaja Homeowners Assn. WWTP
Basin Name/Sub-basin number
03-13-01 / stream index 3-3
Receiving Stream
Norton Mill Creek
Stream Classification in Permit
C-Trout +
Does permit need Daily Max NH3 limits?
No — already present
Does permit need TRC limits/language?
No — already present
Does permit have toxicity testing?
No
Does permit have Special Conditions?
No
Does permit have instream monitoring?
Temperature & Dissolved Oxygen
Is the stream impaired (on 303(d) list)?
No
Any obvious compliance concerns?
No. The facility received one enforcement and
3 NOVs during the past permit cycle.
Any permit mods since last permit?
No
New expiration date
8/31/2027
Changes in Draft Permit?
➢ Added limit for turbidity as per 15A
NCAC 02B.0211 (21).
> Updated temperature footnote in
section A. (1.)
➢ Update eDMR text in section A. (2.)
The stream classification for this permit is C-Trout +. The "+" symbol is referenced in 15A NCAC 02B.0303 (q),
which states:
"(q) The Little Tennessee River Basin and Savannah River Drainage Area Classification Schedule was amended July 1, 2009
with the reclassification of the watershed of the lower portion of the Horsepasture River [portion of Index Number 4-13-
(12.5)] from a point approximately 0.60 miles downstream of N.C. 281 (Bohaynee Road) to the NC -SC state line from Class
B Tr to Class B Tr ORW, and the watershed of the upper portion of the Horsepasture River [Index Number 4-13-(0.5) and a
portion of Index Number 4-13-(12.5)] from source to a point approximately 0.60 miles downstream of N.C. 281 (Bohaynee
Road) to include only the ORW management strategy as represented by "+". The "+" symbol means that all undesignated
waterbodies that are located within the watershed of the upper portion of Horsepasture River shall comply with Rule .0225(c)
of this Subchapter in order to protect the designated waters as per Rule .0203 of this Subchapter and to protect outstanding
resource values found throughout the entire Horsepasture River watershed. Site -specific management strategies are outlined
in Rule .0225(e)(13) of this Subchapter."
15A NCAC 02B.0225 (c) states:
"(c) Quality Standards for ORW.
(1) Freshwater: Water quality conditions shall be maintained to protect the outstanding resource values of waters classified
ORW. Management strategies to protect resource values shall be developed on a site -specific basis during the proceedings to
classify waters as ORW in accordance with Rule .0101 of the Subchapter. No new discharges or expansions of existing
discharges shall be permitted, and stormwater controls for all new development activities requiring an Erosion and
Sedimentation Control Plan in accordance with rules established by the NC Sedimentation Control Commission shall comply
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with the stormwater provisions set forth in 15A NCAC 02H .1000, including the specific stormwater management
requirements for freshwater ORW areas set forth in 15A NCAC 02H .1019 and .1021."
NC0064416 is an existing discharge. The permit does not contravene 15A NCAC 02B.0225 (c).
PARAMETERS OF CONCERN FOR TROUT WATERS
TEMPERATURE
15A NCAC 02B.0211 (18) requires that "the instream temperature shall not be increased by more than 0.5
degrees C (0.9 degrees F) due to the discharge of heated liquids, but in no case to exceed 20 degrees C (68
degrees F)." If the stream temperature exceeds 20 degrees C due to natural background conditions, the effluent
cannot cause any increase in instream water temperature:
During the period 2017-2022, the facility discharged effluent above 20 degrees C during the following periods:
June — October 2017. Downstream temperature exceeded 20°C twice in July 2017. Upstream and Downstream
temperature exceeded 20°C in August 2017.
June — September 2018. No instream temperatures above 20°C during this period.
May — September 2019. No instream temperatures above 20°C during this period.
June — September 2020. No instream temperatures above 20°C during this period.
June — August 2021 (+2 days in October 2021) No instream temperatures above 20°C during this period.
DISSOLVED OXYGEN
15A NCAC 02B.0211 (6) requires a daily average of at least 6.0 mg/L in the effluent.
During the period 2017-2022, the facility had no discharges with <6.0 mg/L of dissolved oxygen in the effluent.
TURBIDITY
15A NCAC 02B.0211 (21) requires a daily maximum limit of 10 NTU for discharges to Trout waters. Turbidity
monitoring is being added to the permit at this renewal. There is currently no turbidity data to review.
Ammonia and Total Residual Chlorine Limitations
Limitations [monthly average] for ammonia are based on protection of aquatic life utilizing an ammonia chronic
criterion of 1.0 mg/L (summer) and 1.8 mg/L (winter). Acute [weekly average] ammonia limits are derived from
chronic criteria, utilizing a multiplication factor of 3 for Municipals and a multiplication factor of 5 for Non -
Municipals.
Limitations for Total Residual Chlorine (TRC) are based on the NC water quality standard for protection of
aquatic life (17 µg/L) and capped at 28 µg/L (acute impacts). Due to analytical issues, all TRC values reported
below 50 µg/L are considered compliant with their permit limit.
Describe any proposed changes to ammonia and/or TRC limits for this permit renewal: The current NH3-N limits
were established in the permit in 1991. They are consistent with the 2016 guidance on ammonia limits. No
changes are proposed.
The current TRC limit was established in 1991. It is consistent with the Division's 2003 TRC policy.
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