NC0040011_staff comments_19910822

State of North Carolina
Department of Environment, Health, and Natural Resources
Division of Environmental Management
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Govemor George T. Everett, Ph.D.
Wiliam W. Cobey, Jr., Secretary Director
August 22, 1991
Memorandum
To: Melba McGee
From: SM A. Wilson
Through: Ruth C. Swanek 'C.
Carla Sanderson
Subject: Yanceyville Wastewater Treatment Plant
Project Review Form Project No. 92-0062
Caswell County
The Technical Support Branch of the Water Quality Section has reviewed the engineering
report of the proposed expansion, for the Town of Yanceyville, from their current design flow of
0.25 MGD to 0.45 MGD. Technical Support suggests that the Town consider the following when
evaluating the treatment scenario:
1. At the proposed discharge of 0.45 MGD, limits more stringent than 30 mg/1 BOD5 and 4 mg/1
NH3-N would have to be met. Review of the model indicates that, at minimum, a BOD5 limit of
24 mg/1, NH3-N limit of 2.3 mg/1, and a D.O. limit of 5 mg/1 would have to be met during the
summer months. These limits are speculative only. A thorough analysis of limitations at the
expanded flow of 0.45 MGD will be reviewed upon Yanceyville's formal permit application.
2. The Town is currently evaluating the need for a pretreatment program based on an industrial
addition. It is possible that limits based on complex wastewater discharges may be implemented
(i.e. metals limits, whole effluent chronic toxicity limit, etc.). The proposed treatment scenarios
and costs should take this possibility into account.
3. The Winston-Salem Regional Office expressed concern about the integrity of the main sewer
line and its ability to transfer effluent to the treatment facility. The Town should address
maintenance/reparation of existing sewer lines.
4. Country Line Creek, where Yanceyville WWTP discharges, is currently classified as "WS-III".
However, the WWTP discharge is directly after the water supply intake. Highway 62 (below the
treatment plant discharge) was chosen as a convenient boundary for designating the water supply
classification. This classification may effect the expanded limits and should be corrected.
Although classification boundaries are currently under review, the Town should bring this issue to
the attention of Steve Zoufaly, Planning Branch, Water Quality Section.
cc: Steve Mauney, WSRO
Steve Zoufaly, Planning Branch (Item 4)
Alan Clark, Planning Branch
Pollution Prevention Pays
P.O. Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
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