NC0068152_Correspondence_20110225

Eden Glen Mobile Home Park
172 Wembley Road
Asheville, NC 28804
828.691.0586
Leigh W. Young
February 24, 2011
Mr. Bob Guerra
North Carolina Department of Natural Resources
Division of Water Quality- Point Source Branch
1617 Mail Center
Raleigh, NC 27699-1617
Dear Mr. Guerra:
I am requesting a minor modification for the Eden Glen Mobile Home Park Waste Water
Treatment Plant NPDES permit number NCO0681520068152 to accept the backwash
filtered water from a new water treatment process.
The CSI system which we are using for the process provides a first stage of oxidation in
two (two) tanks. Oxidation is achieved by injection of ambient air into the tanks and
mixing with the well water. No water softeners, salts or other chemicals are used in the
oxidation process; therefore there would be no wastewater toxicity issues.
Following oxidation would be filtration, using three (3) tanks. The filter process also
does NOT use any chemicals and is NOT a "green sand" filter. During oxidation and
filtration, the pH will be adjusted and maintained between 6.8 and 7.2.
Backwash occurs approximately every 3-4 days. The volume of wastewater generated
would be about 900 gallons. The backwash wastewater will first enter a settling tank, to
allow iron and manganese to settle out. Then, the supernatant (clear settled water)
from the settling tank would enter a pump tank. This pump tank water would be fed at
low volumes to the wastewater plant at a rate of about 300 gallons per day.
Accumulated sludge in the settling tank can be pumped and hauled by a commercial
septage hauler, along with the excess sludge from the wastewater plant. Although this
would increase the frequency and cost of pumping, it would eliminate the costs
associated with increased monitoring for iron, toxicity. Our understanding is that
additional monitoring would not be required.
Thank you for your help and support.
Best regards, �
Its V D
� V D
R
*eig.Young FEB 2 5 2011