WQ0009089_More Information (Requested)_19940406

State of North Carolina
Department of Environment,
Health and Natural Resources
G,1r Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Hugh B. Barwick, Jr., President
Coharie Incorporated
P.O. Box 860
Clinton, NC 28328
Dear Mr. Barwick:
April 6, 1994 k' : , ... ?, yFT
¢. 4
APR 7 1994
FA.Y.c1TEVILLE F(cG. OFFICE
Subject: Application No. WQ0009089
Additional Information Request
Coharie Incorporated
Deer Track Subdivision
STEP Sewer System
Sampson County
The Permits and Engineering Unit has completed a preliminary engineering review of the subject
application. The following items must be addressed before we can complete our review:
1) In accordance with 15A NCAC 2H .0219 (1) (1), the Division requires that a value of 120 GPD
per bedroom, with a minimum value of 240 GPD per unit, be used to calculate the estimated
volume of wastewater generated for residential dwelling units (DU). Please indicate the
specific number of bedrooms per DU, and recalculate the total flow volume estimate using this
figure. If the recalculated value is different from that originally calculated, please revise page 2
of your application.
Note: Please provide a letter of flow acceptance from the City of Clinton which specifies the
amount of flow indicated on page 2 of the application.
2) Please include the total amount of 1.5-inch pressure service line, to be used to connect each
house to the common pressure sewer, on page 5 of the application, along with the values of 2-
inch and 3-inch pressure sewer. (If the exact figure cannot yet be determined, an estimate
calculated on a per house basis will be adequate.)
2a) Please recheck the total linear footage of 2-inch and 3-inch pressure sewer. If the recalculated
value is different from that listed on page 5 of your application, please revise page 5 to reflect
the correct linear footage.
3) Please verify that the system will include 39 pumps, each with a 40 GPM capacity.
4) The Division typically requires 24 hours of storage above the high water level of each wet well.
Preliminary calculations have shown that approximately 7.2 hours of storage are available
above the high water level (for an average flow of 360 GPD--3 bedroom house), and
approximately 16.8 hours of total storage are available in each wet well. Please either redesign
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the wet wells to provide more storage, or indicate what special precautions, etc. will be taken to
prevent overflow in the event of pump failure.
5) Page 5 of your application indicates that the minimum and maximum velocities in the 3-inch
force main are a constant 1.64 fps. The velocity must meet or exceed 2.0 fps at some time
during system operation to comply with I SA NCAC 2H .0219 (i) (2) (B).
6) The two conditions listed below are applicable to each pressure sewer or STEP system, and are
included in each permit for either type of system. Please explain how Coharie Incorporated
will address the following items:
a) The permittee shall maintain on hand for immediate installation a supply of spare, fully
operational pump units of each type used in the pressure sewer system. The number of
pumps on hand shall not be less than 10 percent of the number of installed units, or one
unit, whichever is greater.
b) Each pump station shall be clearly and conspicuously posted with the telephone number
of the owner/operator of the pressure sewer system and instructions to call the number
in the event of high water alarm activation.
Refer to the subject permit application number when providing the requested information. Please
submit three (3) copies of all information to my attention at the address below. Also,
please note that failure to provide this additional information on or before May 9, 1994, will subject your
application to being returned as incomplete, in accordance with 15A NCAC 2H .0208.
If you have any questions on this matter, please call me at [phone] ext. 549.
Sincerely,
J Onmental
nvEngineer
State Engineering Review Group
cc: Fayetteville Regional Office
Permit File WQ0009089
The Wooten Company