WQ0000795_Request for Specualtive Limits_20180402

?ii6i TOWN OF SURF CITY 214 N NEW RIVER DRIVE
POST OFFICE BOX 2475
SURF CITY, NORTH CAROLINA 28445
[phone] I FAX[phone]
7949
DOUGLAS C MEDLIN, MAYOR DONALD R HELMS, COUNCILMAN
WILLIAM (BUDDY) J FOWLER, MAYOR PRO-TEM TERESA B BATTS, COUNCILWOMAN
NELVA R ALBURY, COUNCILWOMAN JEREMY SHUGARTS, COUNCILMAN
April 2, 2018
Ms. Julie Grzyb, Supervisor
NPDES Complex Permitting
NC Department of Environmental Quality
Water Resources RECEIVE®/DENR/DWR
1617 Mail Service Center
Raleigh,North Carolina 27699-1617 APR o 5 2018
(Also sent via email to: julie.grzyb@ncdenr gov) Water Resources
Permitting Section
RE: Request for NPDES Permit Speculative Limits for
Discharge of Tertiary Treated Municipal Wastewater Effluent from
Surf City Wastewater Treatment Facility
Town of Surf City,North Carolina
Dear Ms Grzyb•
The Town of Surf City currently has a tertiary municipal wastewater treatment facility(WWTF)with an
average daily flow(ADF)capacity of 1.5 million gallons per day(mgd) This facility is located just south
of the Town of Holly Ridge in Onslow County. Treated effluent is disposed of via land application onto
the Sarge Martin area contiguous to and southeast of the WWTF and onto the Juniper Swamp area on the
west side of NC Hwy 50 several miles north of Holly Ridge The entrance to the Juniper Swamp area is
located at about the following lat/Ion coordinates. 34-34-21.40 N/77-35-13.69 W.
Attached please find a copy of the town's permit for the WWTF and two land application areas(21
pages). As you can see,the town has approval to land apply a maximum yearly average of just over
0.756 mgd of combined treated wastewater effluent and accumulated rain water(in the open effluent
storage ponds),weather permitting. The Sarge Martin land application site has reportedly been developed
to its maximum yearly average capacity of just over 0.467 mgd and has no more capacity available. A
draft soil science report recently received for the Juniper Swamp site indicates that its current maximum
yearly average capacity of just under 0.289 mgd can only be increased by about another 0.066 mgd to
maximize the capacity available at this site.
In summary, it is currently believed that the maximum potential land application capacity for the two
existing sites together is about 0.822 mgd on a maximum yearly average basis. However,keep in mind
that this is for combined treated wastewater effluent and accumulated rain water(in the open effluent
storage ponds),weather permitting. Assuming with average rainfall that the effluent makes up about 90
percent of the total,then the maximum potential treated effluent disposal capacity is about 0.740 mgd
on an ADF basis,or roughly half the existing capacity of the WWTF.
WWW TOWNOFSURFCITY COM

Request for NPDES Permit Speculative Limits
Discharge of Tertiary Treated Municipal WW Effluent
Surf City WWTF
Town of Surf City,NC
April 2, 2018
Page 2
The town is working to identify additional areas and means of disposing of its treated effluent One
potential avenue being explored is a NPDES discharge. The town is interested in two potential locations
for a discharge. Shelter Swamp Creek at NC Hwy 50 and Holly Shelter Creek just downstream of its
confluence with Angola Creek.
The closest stream of significance(from the existing treated effluent force main to the Juniper Swamp
area) is Shelter Swamp Creek It crosses NC Hwy 50 about 3.2 miles(along the highway)north of the
entrance to the Juniper Swamp disposal area. The stream crossing is located at about the following lat/
lon coordinates. 34-36-53.30 N/77-35-14 65 W.
Shelter Swamp Creek flows into Sandy Run Swamp which then flows into Holly Shelter Creek which
then flows into the Northeast Cape Fear River. All of these streams are currently classified C, Sw
We are in discussions with USGS (Curtis Weaver)regarding the low flow statistics at this location. At
this point the low flow ranges are as follows.
• 7Q10. 0 13 to 0 21 cfs
• W7Q 10. 0.73 to 1.2 cfs
• 7Q2 055to092cfs
• 30Q2. 1 3 to 2.2 cfs.
The range for each is due to differences in watershed area calculation methods(USGS StreamStats(25 1
square miles)versus manual(planimeter)estimation using USGS 7.5' quad maps(41.7 square miles). As
you know, defining drainage basins in the Coastal Plain can be difficult and subject to debate, especially
when manmade ditching may have been done in the past The lower flow estimates are based on the
USGS area calculations The higher flow estimates are based on our area calculations Depending upon
your response to this speculative limits request,we may or may not pursue this further with USGS.
The second stream of interest is the main stem of Holly Shelter Creek just downstream of its confluence
with Angola Creek This location is off of NC Hwy 53 southwest of its intersection with NC Hwy 50 in
Maple Hill. This location on Holly Shelter Creek is located at about the following lat/lon
coordinates. 34-38-22.63 N/77-44-17.23 W. Holly Shelter Creek flows into the Northeast Cape Fear
River. Both of these streams are currently classified C, Sw.
This location is just downstream of Site Index No 661 from USGS WRIR 01-4094 USGS StreamStats
reports watershed areas of 100 and 142 square miles at Site Index No. 661 and our point of interest just
downstream of the confluence with Angola Creek, respectively By proration,the calculated flow
statistics at our point of interest just downstream of Angola Creek are as follows.

Request for NPDES Permit Speculative Limits
Discharge of Tertiary Treated Municipal WW Effluent
Surf City WWTF
Town of Surf City,NC
April 2,2018
Page 3
• 7Q10. 0.71 cfs
• W7Q10: 4.1 cfs
• 7Q2. 3.1 cfs
• 30Q2. 7.5 cfs.
Copies of our email correspondence with USGS (Curtis Weaver)and other pertinent technical
information can be provided for your use upon request.
The Town of Surf City would like to explore the possibility of disposing of a portion of its tertiary treated
effluent via NPDES permit discharge at one of these two locations. Please review the above information
at your earliest convenience and provide us with speculative NPDES permit limits at each of these two
locations.
If you need additional information or clarification,please advise.
Sincerely,
TOWN OF SURF CITY
ry ator-------
Laurence C. Bergman
Town Manager
cc: C V (Vance) Brooks, IV, PE, Highfill Infrastructure Engineering, P C