NC0072699_Plan of Action_20180427

0
Town of Beaufort
lot Front St. • P.O. Box 390 • Beaufort, N.C. 28516
252-728-2141• 252-728-3982 fax
erg bLauforincu
April 27, 2018
Mr. Dean Hunkele, Senior Environmental Specialist
NC DEQ / Division of Water Quality
Wilmington Regional Operations
127 Cardinal Drive
Wilmington, North Carolina 28405
RE: Town of Beaufort Pine Street WTP \ NPDES Discharge Permit NC 0072699
PROPOSED ALTERNATIVE PLAN FOR COMPOSITE SAMPLE by the TOWN OF BEAUFORT
Dear Mr. Hunkele:
In conformance with requirements of the above -referenced permit, the Town of Beaufort is
proposing an Alternative Plan for Composite Sampling at the Pine Street Water Treatment Plant.
The Pine Street WTP utilizes four (4) ion -exchange water softeners to reduce hardness of the
potable water leaving the water treatment plant. The softeners undergo regeneration after
130,000 gallons of raw water has passed through the softener. The regeneration cycle includes
four (4) steps as follow:
n
CYCLE STEPS
Q-Flow
TIME
VOLUME
i
BACKWASH STEP
69 gpm
16 minute
1104 gallon
2
BRINE STEP
27 gpm
30 minute
810 gallon
Mayor Everette S.(Rett) Newton
Commissioner John Hagle • Commissioner Sharon Harker • Commissioner Marianna Houmshed
Commissioner Ann Carter • Commissioner Charles McDonald
Town Manager John Day

Town of Beaufort
701 Front St. • P.O. Box 390 . Beaufort, N.C. 28516
252-728-2141. 252-728-3982 fax
-- L(nrtm-orz
3
FAST RINSE STEP
26 gpm
31 minute
806 gallon
4
SLOW RINSE STEP
25 gpm
20 minute
500 gallon
TOTAL
97 minute
3,220 gallon
The composite sample will be created by taking equal specimens in excess during each of the
four steps with number and intervals shown by attached worksheets. The grab specimens for
each step shall generally be taken at start, middle and end of the step with intervals varying from
3 to 9 minutes. The specimens taken in excess are from flow over a v-notch weir by using fixed
volume container which could be a quart,''/: -gallon or gallon and no less than a liter.
The specimens taken from each step shall be placed in container and mixed to have four
homogenous specimens in four separate containers — one container for each step.
A prescribed volume from each of the separate containers shall be placed in one container to
create the composite sample. The proportionate volumes shown by attached worksheet will
create a five (5) gallon composite sample. The total composite sample can be modified relevant
to what is necessary for laboratory testing with proportion percentages remaining constant.
Please call if you have any questions.
Sine
tom/
John Day, Town Manager "
Town of Beaufort
Mawr Everette S. (8ett) Newton
Commissioner John Hagle • Commissioner Sharon Harker • Commissioner Marianna Hollinshed
Commissioner Ann Carter • Commissioner Charles McDonald
Town Manager John Dap

Town of Beaufort
lot Front St. • P.O. Box 390 • Beaufort, N.C. 28516
252-728-2141. 252-728-3982 fax
>YB'L'Ju•:udrttncn
enclosure
cc: BriannaYoung,EnvironmentalSeniorSpecialist—NCDEQ\DWR
Gale Smith, P.E. — Rivers & Associates
Wade Keeler, WTP Operator
Donovan H. Willis, Public Utilities Director — WWTP ORC
Mayor Everette S. (Rett) Newton
Commissioner John Hagle • Commissioner Sharon Harker • Commissioner Marianna Hollinahed
Commissioner Mn Carter • Commissioner Charles McDonald
Town Manager John Day

18631600
18632700
-----------©
1100
:. 11
-------------
I I
SAY
SUBTOTAL
2
BR
regeneration -PINE 1 of 04

PINE STREET WATER TREATMENT PLANT
SOFTENER REGENERATION -BACKWASH
SOFTENER NO.2
3
FAST RINSE STEP
METER
start:
18633400
18634200
3
end:
31.4
77.4
min
min
min
min
min
min
min
SAY
SUBTOTAL
800
gallon
minute
25.49
GPM
0
0
3
11
20
28
31
46
46
49
57
66
74
77
4
SLOW RINSE STEP
BACKWASH STEP
1100
gallon
16.0
minute
34.4%
generation -PINE 2 of 04

PINE STREET WATER TREATMENT PLANT
specimen Islep
0 BEGIN CYCLE 0 BEGIN BACKWASH STEP mm�
MMM�
specimen
specimen
grab specimen PINE 3 of 04

S
PE4E STREET WATER TREATMENT PLANT
MINUTE rCYCLE
MINUTErSTEP
-_-_�-_�ecjmen__-_
BEGIN
RINSECONTINUE
SLOW
r
0
r
97 END CYCLE 20 END SLOW RINSE
grab specimen PINE 4 of 04