NC0086169_Staff Report and Recommendations_20010524

SOC PRIORITY PROJECT: No
To: Permits and Engineering Unit
Water Quality Section
Attention: Mike Myers
Date: May 18, 2001
NPDES STAFF REPORT AND RECOMMENDATIONS
County: Cabarrus
NPDES Permit No.: NC0086169(Modification)
MRO No.: 01-06
PART I-GENERAL INFORMATION _0`
1. Facility and address: Corning, Inc.
Post Office Box 1700f'AY 2 4 2001 Ii
Concord,N.C. 28026-1700
2. Date of investigation: N/A L =_. T- WATER QUALITYSOURCE BRANCH
3. Report prepared by: Michael L. Parker, Environmental Engineer II
4. Person contacted and telephone number: Christie Hannan, [phone].
5. Directions to site: From the jct. of Hwy. 601 and Hwy. 24-27 in the Town of Midland in
southern Cabarrus County,travel south on Hwy. 601 2.65 miles. The Corning plant is
located on the right(west) side of Hwy. 601.
6. Discharge point(s), List for all discharge points: -
outfall 001 outfall 002 outfall 003
Latitude: 35° 13' 02" 35° 12' 34" 35° 12' 30"
Longitude: 80° 31' 15" 80° 31' 31" 80° 29' 49"
Attach a USGS Map Extract and indicate treatment plant site and discharge point on map.
USGS Quad No.: G 16 NE
7. Site size and expansion area consistent with application: Yes. There is sufficient area
available for the construction of any proposed treatment units.
8. Topography(relationship to flood plain included): Relatively flat, 2-4%slopes. The plant
site is not located in a flood plain.
9. Location of nearest dwelling: Approx. 500+feet from the WWTP site.

f
Page Two
10. Receiving stream or affected surface waters: U.T. to Muddy Creek(outfall 001), U.T. to
Clear Creek(outfall 002), Rocky River(outfall 003).
a. Classification: C (for all outfalls)
b. River Basin and Subbasin No.: Yadkin 030712
c. Describe receiving stream features and pertinent downstream uses: Little, if any
flow noted at the discharge locations for outfalls 001 and 002 (dry ditch).
Excellent flow observed in the Rocky River at outfall 003.
PART II -DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater: 0.269 MGD (outfalls 001 & 002), 0.147 MGD* (outfall
003) *New flow figure based on current modification request.
Outfall 001 contains the following types of wastewater:
1. Stormwater.
Outfall 002 contains the following types of wastewater:
1. Stormwater
2. Humidification boiler blowdown
Outfall 003 contains the following types of wastewater:
1. Blowdown from pollution abatement equipment.
2. Water softener from area floor drains.
3. Water softener blowdown.
4. Cooling tower blowdown.
5. Some stormwater
b. What is the current permitted capacity: N/A
c. Actual treatment capacity of current facility (current design capacity): N/A
d. Date(s) and construction activities allowed by previous ATCs issued in the
previous two years: N/A
e. Description of existing or substantially constructed WWT facilities: The existing
WWT facilities consist of a 21,000-gallon equalization tank followed by two off-
spec tanks (36,000 and 21,000-gallon),two (2) Lamella clarifiers,a 60,000-gallon
chloride stabilization tank, four(4) 1,600-gallon pH adjustment tanks, a 10,000-
gallon softener regenerate tank, a neutralization transfer tank, 21,000-gallon
surge/blend tank, three(3) sludge thickening tanks (575, 5,000 and 10,000-
gallon), an effluent lift station, a 42,000-gallon process effluent tank (for storage
of wastewater when quality does not meet permit limits) and flow measurement.

Page Three
f. Description of proposed WWT facilities: No additional facilities are proposed.
Modification request is for an increase in flow only.
g. Possible toxic impacts to surface waters: Chlorides are present in the waste
stream.
h. Pretreatment Program(POTWs only): Not Needed.
2. Residual handling and utilization/disposal scheme: Current residuals disposal scheme
involves thickening and storage in a residuals holding tank. The residuals are then
pumped into drums where they are transported to Michigan for further treatment, and then
landfilled.
3. Treatment plant classification: Class III (based on current treatment processes).
4. SIC Code(s): 3357 Wastewater Code(s): 73, 16
5. MTU Code(s): 51012
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds or are any public monies
involved (municipals only)? No
2. Special monitoring or limitations (including toxicity)requests: None at this time.
3. Important SOC/JOC or Compliance Schedule dates: N/A
4. Alternative analysis evaluation:
a. Spray Irrigation: Generally poor soils in the vicinity of the plant site. Insufficient
area available for the construction of a spray irrigation WWT system.
b. Connect to regional sewer system: Corning currently discharges all domestic
wastewater into the Water and Sewer Authority of Cabarrus County's Muddy
Creek WWTP. There is currently insufficient capacity at the Muddy Creek
WWTP to accept all of Corning's waste streams.
c. Subsurface: Insufficient area,poor soils.

•
Page Four
PART IV-EVALUATION AND RECOMMENDATIONS
Corning, Inc. requests a modification to the subject NPDES Permit for an increase in the
permitted flow at outfall 003. The current permitted flow is 0.107 MGD and Corning requests
approval to increase this flow to 0.142 MGD. No additional treatment components are proposed
for this modification.
Pending a technical review of this request by the NPDES Unit, it is recommended that the
request for an increase in flow at outfall 003 be approved as requested.
/ / S=iBral
Signature of Report Preparer Date
D. f?.- k s- 2/ 0/
Water Quality Re 1. Supervisor ate
n:1cIsrol\corrung.sr