NC0023086_Residual Management Plan_20180316

Residuals Management Plan
Fontana Dam Wastewater Treatment Plant
During normal operation waste activated sludge and scum from the clarifiers is conveyed by
submersible pumps to the existing digester. In the digester, the aeration diffusers are periodically
tuned off to allow the contents to settle. Once the sludge has settled and the supernatant has
risen to the top, it can be decanted off by opening a plug valve on the supernatant line which
allows supernatant to flow to the digester overflow wet well where it is pumped back to the head
of the plant. By decanting the sludge in the digester the percent solids is increased. The
residuals are then hauled offsite by Kenny Ball Septic and Grading of 377 E. Deep Creek Road,
Bryson City, NC 28713.
Per 15A NCAC 02H a minimum of 30 days of solids storage is required. Solids will be produced at
a rate of 39.9 lbs/day based on a design flow of 300,000 gpd and 0.7 lbs solids per 1000 gallons of
wastewater (Metcalf and Eddy, Wastewater Ening eering Yd Edition, pg 773) (300,000 gpd x 0.7 lbs
solids / 1000 gal. = 210 lbs solids / day). Assuming a 1.3 % solids concentration (Metcalf and
Eddy, Wastewater Ening eering Yd Edition, pg 774) approximately 57,802 gallons of sludge will be
produced in 30 days (2 10 lbs solids / day x l/ (62.4 lbs / cubic foot water x 1.005 (specific gravity of
1.3% sludge) x 0.013 (solids content) = 257.59 cubic feet per day = 1,926.7 gpd * 30 days = 57,802
gal sludge produced in 30 days). The existing sludge digester is sized to hold approximately 17,130
gallons (18'^2 x n/4 x 9' water level = 2,290 CF = 17,130 gallons) which is less than 57,802 gallons
therefore the sludge storage requirement is not met.
Since the existing digester does not meet the 30 day sludge storage requirement set forth by 15A
NCAC 02H the residuals in the tank will have to be hauled offsite approximately every 9 days to
allow for additional sludge and scum withdrawal from the clarifiers.
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in
INDEPENDENT CONTRACTOR AGREEMENT
THIS INDEPENDENT CONTRACTOR AGREEMENT (the "Agreement") dated 11th
day of December, 2017
Y
BETWEEN:
The Town of Fontana Dam of 11517 Fontana Road, Fontana Dam, North Carolina, 28733
(the "Client")
-AND-
Kenny Ball Septic and Grading of 377 E. Deep Creek Road, Bryson City, North Carolina, 28713
(the "Contractor").
BACKGROUND:
A. The Client is of the opinion the Contractor has the necessary qualifications, experiences,
and equipment to provide services to the Client.
B. The Contractor is agreeable to providing such services to the Client on the terms and
conditions set out in this Agreement.
IN CONSIDERATION OF the matters described above and of the mutual benefits and
obligations set forth in this Agreement, the Client and Contractor agree as follows:
SERVICES PROVIDED
1. The Contractor agrees to provide the Client with the following services:
• Haul sludge from the town wastewater plant, and dispose of it in safe and sanitary
way that is in accordance with state regulations.
COMPENSATION
2. The Contractor will charge the Client for the Services as follows:
The Town of Fontana Dam agrees to pay Kenny Ball Septic and Grading $550 per
load of sludge up to 2,500 gallons per load.
• Invoices submitted by the Contractor to the Client are due within 30 days of receipt.
Parties have dulf affixed their signatures agreeing to this contract. The contract will become
active upon completion of the upgrades to the town's wastewater plant.
Town of Fontana Dam
Kenny Ball Septic and Grading