NCG550016_Lab Data_20231107

SwSG Stormwater Services Group, LLC
8916 Oregon Inlet Court
Raleigh, North Carolina 27603
Phone: [phone]
Fax: [phone] O8
November 3, 2023
Jane Bernard
Raleigh RO — Surface Water Protection
NC Division of Environmental Quality
1628 MSC
Raleigh NC 27699-1628
RE: Howard Property, 2318 NC Hwy 97, Wilson NC
NPDES General Permit NCG550016
Dear Ms. Bernard:
In response to Permit requirements, we collected a discharge sample from the sand filter and have analyzed it for the parameters
indicated in the General Permit. The results are as follows: t
Table 1— Effluent Analysis Results
Outfall
Date
Flow,
Gals/ Day
hest)
BODS,
mg/L
TSS,
mg/L
pH,
Std. Units
Ammonia,
mg/L
Total
Nitrogen,
mg/L
Total
Phosphorus,
mg/L
Total
Residual
Chlorine,
m L
Fecal
coliform,
MPN/ 100
mL
Limits
1000
45.0
45.0
6.0 - 9.0
Monitor & Re ort
0.017'
400
Sand Filter
11/03/21
100
31.5
16.2
6.21
25.0
1 49.8 3.9
2.20
2420
Sand Filter
11/29/22
0
No Flow
Sand Filter
10/23/23
100
151
143
6.79
21.3
32.7
8.3
> 5.00
2420
' Receiving stream chlorine levels are not to exceed 17 µg/L. Sample is taken at end of effluent pipe. Flow from effluent pipe is not connected to surface waters
of the State; flow disperses into a vegetated buffer and infiltrates into the ground.

NCDEQ
November 3, 2023
Page 2
SwSG
Today's flow rate is estimated based on two (2) adults living at the residence using 50 gals/ day/ person. This flow rate is probably
over -estimated as there is at most a low trickle flow2 from this system unless we surcharge the sand filter by running the cold water
faucet at the bathtub for at least 45 minutes.
Note that there is no direct discharge from this system into
"waters of the State. " Flow from this system is dispersed
onto a grassy slope then into a narrow wooded buffer along
an agricultural field.
The neat effluent sample will be collected and analyzed in
Yd Quarter 2023. In the meantime, if you have any
questions, do not hesitate to call me.
Sincerely,
STO 7ER S
SEERV
`ICES GROUP, LLC
7 -
es D. Frei
Senior Project Manager
cc: Lester Howard, Owner
File
Figure I - Effluent Pipe before surcharging
2 There was no flow upon arrival at the residence. See Figure 1.