WQCS00047_NOV-2020-DV-0198 Response_20200601

NC Dept of Environmental Quality
-111N - 9 2020
p Raleigh Regional Office
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Public Works Department
CITY OF SANFORD
P. O. BOX 3729 TELEPI[ONE 919-777-1118
FAX [phone] North Carolina 27331-3729 or 919-777-1122
Paul M. Weeks, Jr., P.E.
City Engineer
June 1, 2020
Scott Vinson, Regional Supervisor
Water Quality Regional Operations Section
Raleigh Regional Office
Division of Water Resources, NCDEQ
3800 Barrett Drive
Raleigh, NC 27609
RE: Notice of Violation
NOV-2020-DV-0198
Permit No. WQCS00047
City of Sanford Collection System
Lee County
Dear Mr. Vinson:
We are in receipt of the above referenced Notice of Violation, dated May 4, 2020, which
involved three incidents; 305 E Rose (202000342), Sycamore and Second (202000344),
and Market and Hickory (202000348). Below is a discussion of the history as well as the
current and future actions being taken to address these occurrences. Attached is an
overview map showing the locations of the overflows and the projects that are discussed
in this letter.
The Event
On February 6, 2020, overflows were reported at the three locations, which are all located
in Little Buffalo basin. The cause was attributed to a severe natural occurrence.
Please find attached rain gauge data from the Big Buffalo Water Reclamation Facility.
The spill site in question is more than 4 miles from the rain gauge location however the
data shows a large amount of rain on February 6th.
RAEngineering FiiesIMEMOSIFY 19 - 20'.0068 pw - Response to NOV.doc

Current and Future Actions
All three locations are part of the same outfall where we have had previous overflows.
To help address this situation, we have completed one recent project and two others are
underway:
Skunk Creek Rehabilitation project
This year, the City finished a cured in place lining project, part of which took place in the
Little Buffalo basin. We cleaned 2,735 feet of 8-inch sewer in Little Buffalo basin, of
which we lined 1,175 feet. Investigations last year identified those sections of line as
sources of inflow and infiltration. This work took place prior to the February event and
may have lessened the impact. In the Spring of 2021, we will flow monitor that area to
determine the impact of our work.
East Sanford CDBG
On February 21, 2020, the City received a $2 million CDBG-I grant to rehabilitate
sections of sewer line in East Sanford that was originally installed prior to 1930. Please
see the attached map. The sections identified for rehabilitation are shown in red.
Sections shown in green are additional segments we may line based on funds available.
This area discharges to the Little Buffalo outfall, therefore any decrease in inflow from
this project will positively impact Little Buffalo. The City is currently acquiring the
services of a grant administrator and engineer for this project. We expect to be able to
start the repair work in the Spring of 2021.
Little Buffalo Rehabilitation — Upper Reach
In January of 2020, design work started to increase the size of a portion of Little Buffalo
outfall. Previously, studies were undertaken to determine our options for addressing the
overflows in the Little Buffalo basin. We expect design to be complete by December of
2020. Concurrently, we are applying for SRF and ASADRA to assist in funding the
construction effort.
Should you have any questions regarding the above information, please feel free to
contact me at any time.
Sincerely,
Paul M. Weeks Jr., F.E.
City Engineer
cc: Vic Czar, Public Works Director
Gerald Cox, Distribution/Collection Administrator
R:''.Engineering FilesMEMOS'TY 19 - 20'-.0068 pw - Response to NOV.doc

MONTHLY CLIMATOLOGICAL SUMMARY for FEB. 2020
NAME: BigBuffalo WWTP CITY. STATE:
ELEV: 261 ft LAT: 35" 18' 00" N LONG: 79" 06' 00" W
TEMPERATURE ("F), RAIN (in), WIND SPEED (mph)
MEAN
DAY TEMP HIGH TIME
1 40.6 46.0 3:30p
2 48.3 63.6 3:30p
3 59.7 76.8 2:30p
4 63.8 70.3 1:30p
5 62.0 64.1 1:00p
6 61.9 71.8 1:00p
7 49.9 61.3 5:00a
8 37.3 44.1 12:30p
9 43.3 56.2 3:30p
10 52.7 66.99 2:OOp
11 66.7 73.3 4:OOp
12 56.6 62.2 12:30a
13 61.9 71.9 10:30a
14 44.5 52.8 2:00p
15 36.0 47.2 3:30p
16 43.2 56.0 2:00p
17 48.4 61.6 2:30p
18 51.7 62.4 3:30p
19 48.8 57.1 2:00a
20 37.8 44.8 11:OOa
21 31.3 37.1 4:30p
22 36.0 55.1 4:OOp
23 45.3 63.1 2:30p
24 46.6 50.9 10:30a
25 55.9 63.9 3:00p
26 57.9 64.0 2:30p
27 42.8 50.8 2:30p
28 40.5 53.3 2:00p
29 37.9 48.6 3:30p
48.6 76.8 3
HEAT COOL AVG
DEG DEG WIND DOM
LOW TIME DAYS DAYS RAIN SPEED HIGH TIME DIR
--------------------------------------------------- ---------
33.1 12:OOm 24.4 0.0 0.02 0.3 10.0 4:00p S
30.5 5:30a 16.7 0.0 0.01 2.5 22.0 1:30p NE
39.9 7:00a 7.5 2.2 0.00 1.1 12.0 1:30p N
58.7 7:O0a 2.1 0.8 0.00 1.8 13.0 2:30p N
59.8 8:30p 3-0 0.0 0.30 1.5 14.0 3:00a NNE
59.0 11:30g 3.5 0.4• 3.52 2.2 23.0 1:00p NNW
36.6 11:00p 15.1 0.0 0.06 5.0 31.0 7:30a NE
27.9 7:00a 27.7 0.0 0.00 0.9 10.0 1:30p ESE
31.5 7:OOa 21.7 0.0 0.00 0.6 11.0 11:30p NNW
33.3 6:30a 12.5 0.1 0.00 0.9 15.0 1:00p N
62.2 12:00m 0.8 2.5 0.15 3.0 23.0 12:30p N
53.2 7:OOa 8.4 0.0 0.01 1.4 13.0 1:30a S
48.3 12:00m 4.1 0.9 0.57 3.6 22.0 9:30a NNE
34.2 12:00m 20.5 0.0 0.00 2.7 17.0 2:OOp SSE
28.7 6:00a 29.0 0.0 0.00 1.1 11.0 8:OOa S
29.1 6:OOa 21.8 0.0 0.06 0.3 10.0 12:30p WNW
40.4 12:OOm 16.6 0.0 0.00 1.0 12.0 11:30a S
37.9 4:00a 13.3 0.0 0.11 0.3 7.0 12:30p S
39.7 12:00m 16.2 0.0 0.13 1.5 15.0 4:30a S
32.8 5:30p 27.2 0.0 0.13 0.9 14.0 11:OOa S
25.3 12:00m 33.7 0.0 0.33 3.5 19.0 9:00a S
22.2 5:30a 29.0 0.0 0.06 0.4 9.0 12:00p SW
25.8 6:30a 19.7 0.0 0.00 0.0 13.0 3:OOp NE
42.7 S:OOa 18.4 0.0 0.33 0.1 8.0 8:30a N
47.9 12:30a 9.1 0.0 0.10 0.6 13.0 5:30a NNW
49.0 12:OOm 7.1 0.0 0.00 1.5 23.0 10:00p NNW
30.0 12:OOm 22.2 0.0 0.00 3.3 22.0 7:30a E
25.7 6:00a 24.5 0.0 0.02 2.0 19.0 2:30p ENE
28.2 11:30p 27.1 0.0 0.01 2.3 22.0 11:30a E
22.2 22 482.9 6.9 5.92 1.6 31.0 7 S
Max >= 90.0: 0
Max <- 32.0: 0
Min <= 32.0: 11
Min <= 0.0. 0
Max Rain: 3.52 ON 02/06/20
Days of Rain: 15 (>.01 in) 9 (>.1 in) 1 (>1 in)
Heat Base: 65.0 Cool Base: 65.0 Method: Integration

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Little Buffalo Creek
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