NCG550642_Lab Data_20240419

4WSG Stormwater Services Group, LLC
8916 Oregon Inlet Court
Raleigh, North Carolina 27603
Phone: [phone]
Fax: [phone] O8
April 18, 2024
Jane Bernard
Raleigh RO — Surface Water Protection
NC Division of Environmental Quality
1628 MSC "
Raleigh NC 27699-1628
RE: Barrett Property, 343 Carlton Dr, Chapel Hill NC
NPDES General Permit NCG550642
lU : - 1I .I
In response to Permit requirements, we have 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:
Table 1— Effluent Analysis Results
Outfall
Date
Flow,
Gals/ Day
(est)
130135,
mg/L
TSS,
mg/L
pH,
Std. Units
Ammonia,
mg/L
Total
Nitrogen,
mg/L
Total
Phosphorus,
mg/L
Total
Residual
Chlorine,
m EL
Fecal
coliform,
CFU/ 100 mL
Limits
1000
45.0
45.0
6.0 - 9.0
Monitor & Report
0.017'
400
Sand Filter
04/04/24
100
<2.0
<4.9
3.88
14.1
42.6
4.8
0.02
2420'
Receiving stream chlorine levels are not to exceed 17 µgL. Sample is taken at end of effluent pipe.
2
Count is probably higher. See qualifier in Pace Analytical analysis report.

NCDEQ
April 18, 2024
Page 2
Flow rate estimate is based on two adults living at the residence using an
average of 50 gpd/ adult. Actual flow rate at this property is much less
as typical daily water usage creates no observable flow. To collect a
sample, the system was surcharged by running cold water through the
septic system for 30 minutes. Pipe had no flow prior to surcharge.
The original laboratory report and chain -of -custody form is maintained
at the residence.
The next effluent sample will be collected and analyzed in 2"d or 3rd
Quarter 2025. In the meantime, if you have any questions, do not
hesitate to call me.
Sincerely,
7STo TER SERVICES Gnoup, LLC
es D. Frei
Senior Project Manager
cc: M. Barrett, Owner
File
Figure I - Effluent Pipe
SwSG