NC0087645_Approval_20071128

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
November 28, 2007
Honorable Walter Lea Thomas IV, Mayor
Town Of Milton
P. O. Box 851
Milton, North Carolina 27305
Subject: Town of Milton,
Flow Reduction Approval
Caswell County
Dear Mayor Thomas:
On August 27, 2007, as a part of the application for a pressure sewer collection system permit, the
Division of Water Quality received a flow reduction request for the Town of Milton served by the proposed
Town of Milton WWTP (Permit No. NC0087645). The letter requests a flow reduction for the entire Town
based on well records from the Town's public water supply system. Additional information was received
September 24, 2007, and October 23, 2007.
The weekly water data provided between September 2006 and August 2007 along with a survey of the
number of bedrooms in each residence and bi-monthly commercial water readings taken during the same period
was analyzed by central office staff. Based upon this data the Division hereby approves a reduction in flow to
60 gallons per day per bedroom (minimum of 120 gpd for 1 and 2 bedroom residences) for sewer extension
permits issued within the Town of Milton and tributary to the Town of Milton wastewater treatment plant. An
aggregate commercial flow reduction is approved at 4,870 gpd for the existing commercial establishments. This
includes 550 gpd for the 2 establishments that showed zero (0) flow at the time of this application. Any new
commercial entities will be permitted at the appropriate flow as given in 15A NCAC 02T .0114. Based on the
current service area, this results in a total flow of 23,170 gpd to be permitted to the W WTP.
Regardless of the adjusted design daily wastewater flow rate at no time shall the wastewater flows
exceed the effluent limits defined in the NPDES permit for the treatment facility or exceed the capacity of the
sewers downstream of any new sewer extension or service connection(s).
If you have any questions or comments regarding this matter, please contact Bennie Goetze, Jr., PE at
[phone] ext. 375, email [[e-mail]].
1nceA ✓V "
-t Coleen H. Sullins
cc: Mr. Steve Tedder, Winston-Salem Regional Office
Ms Amanda Bader, P. E., Dewberry, 2301 Rexwoods Dr., Suite 200, Raleigh, NC 27607
NPDES Permit File NCO087645
PERCS Flow Reduction File
One Pretreatment, Emergency Response and Collection Systems Unit Internet httpJ/h2o.enr.nastate.us/ndpu
No Carolina 1617 Mail Service Center, Raleigh, NC 27699-1617 An Equal Opportunity Adorn Employer
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TOWN OF MILTON FLOW REDUCTION ANALYSIS
From Well Records
Highest week = 28,038 gpd for 6 day period (168230 gallons)
Assume peak 3 day average 10% above weekly average, then peak = 30842 gpg
Assume 20% consumptive losses to include out of town sales, irrigation, etc then average water use =
24,675 gallons.
Total commercial useage - highest bi-monthly = 207,340 gallons or 3456 gpd.
Plus 550 gpd for 0 flow entities
Commercial adf = 4006gpd
Peak measured flow x 25% for peak 3 days (remember bi-monthly billing) = 3456x 1.25 = 4320 gpd
Plus 550 gpd
Total commercial = 4870 gpd
From above, average water use =
24675 gpd
Less commercial
4870 gpd
Total residential flow =
19805 gpd
Residential flows based on 2T rules = 36,600 gpd per survey of number of bedrooms in residences in
the community.
36,600/ 120 = 305 bedrooms.
Plus 14 water only avg 3 bedrooms = 347 bedrooms total served by water.
19805 / 347 = 57 gpd/ bedroom say 60 gpd per bedroom.
305 x 60=18,300 gpd residential + 4870 gpd commercial = 23,170 gpd total to the W WTP.
11/1/07
ABG