NC0060755_Correspondence_19911219

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, Governor George T. Everett, Ph.D
William W. Cobey, Jr., Secretary 0.4.v. a -Director-
December 19, 1991 Rf F
IV
Mr. Carl Daniel
Carolina Water Service, Inc. of NC
PO Box 240705
Charlotte, NC 28224
Dear Mr. Daniel:
I.L . . ., ,,. . •.LA ':,9e' Etil a BROCH
Subjec NPDES Permit No. NC006075
Saddlewoori`Str dilvMon
Alternative Engineering Study
Gaston County
The Division of Environmental Management has reviewed the subject engineering study of
alternatives to the continued discharge from Saddlewood Subdivision. Saddlewood Subdivision
presently discharges to an unnamed tributary to Crowders Creek, a stream which has a 7Q10 and
30Q2 flow of zero.
An examination of the attachments revealed that for all alternatives examined, the estimated
operating costs and the present worth operating cost for 10 years were identical. This must be an
error.
The Division is working towards eliminating all discharges to zero flow streams. The
alternative of pumping the effluent to the larger Gaston County Utilities system is considered a
very environmentally attractive alternative. Pumping to a larger facility benefits the environment by
insuring more consistent treatment, a more consistent effluent, a higher grade of treatment plant,
operator in charge, more resistance to plant upset and, finally, in most cases a larger receiving
stream better able to assimilate the waste.
Since the cost estimates for the Gaston County'Utility alternative ($572,672.00) and the cost
of modifying the existing plant ($529,298.00) are competitive, the Division is strongly considering
requiring the connection to the Gaston County Sewerage System.
Please correct the errors concerning the estimated operating costs for these two options.
Operating costs for a pump station should be considerably lower than the continued operation and
maintenance of an entire treatment plant. When correcting the error, please provide a detailed
estimate of the operating costs and justify any assumptions in as much detail as possible.
Pollution Prevention Pays
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone]
An Equal Opportunity Affirmative Action Employer

If you have any questions or need additional guidance please do not hesitate to call Mr. Don
Safrit or Mr. Dale Overcash at 919/733-5083. If there are no questions we will look for your
response no later than December 31, 1991.
Sin rely /
George T. Everett
cc: Mooresville Regional Office
,W#WB
Central Files

DIVISION OF ENVIRONMENTAL MANAGEMENT
December 16, 1991
MEMORANDUM
TO: Dale Overcash
THRU: Trevor Clements
Ruth Swanek q 5
Carla Sanderson
FROM: Jacquelyn M. Nowell/�'t"
SUBJECT: Review of Engineering Study for Saddlewood Subdivision
NPDES Permit No. NCO060755
Gaston County
The Technical Support Branch has completed its review of the report for the
subject facility. Our comments on the study are as follows:
1) It is our recommendation that the summer/winter limits of 5/l/6 and
10/1.8/6 (BOD5, NH3-N, and DO) that would become effective in June 1993 be main-
tained, if Saddlewood does not connect to a larger treatment facility. The
conclusions of Saddlewood's own engineering study indicate that "discharge lim-
its set for June 1, 1993 for BOD5 and NH3 as N are not unrealistic for an
extended aeration treatment plant." We do not support the request in the June
4th letter from Bruce Haas asking for an increase in the summer BOD5 limit.
2) The facility should further explore the option of pumping to existing
facilities such as the Gaston County Utility System mentioned in the study or
the proposed Gastonia-Crowders Creek WWTP.
3) The engineering consultant should review the estimated annual operating
costs that are given for the alternative disposal methods. The same operating
cost of $94,103 is given for all alternatives, although administration &
maintenance, and power costs differ for each alternative. It would appear that
operating costs should vary.
If there are any questions concerning these comments, please contact me.
cc: Rex Gleason
Central Files
NW -rile