NC0076775_Staff Report_19940113

NPDES DOCIMENT !;CANNIN`i COVER SHEET
NPDES Permit:
NC0076775
Falls Powerhouse
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Staff Report
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
January 13, 1994
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To: Permits and Engineering Unw
Water Quality Section
Attention: Sean Goris
NMi8 1994
EcH ;di P r-ip,0 ,,r P rb j e c t: No
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Date: January 13, 1994
NPDES STAFF REPORT AND RECOMMENDATIONS
County: Stanly
NPDES Permit No.: NC0076775
MRO No.: 94-7
PART I - GENERAL INFORMATION
1. Facility and Address: Falls Powerhouse
c/o Yadkin, Inc.
Post Office Box 576
Badin, N.C. 28009
2. Date of Investigation: April 16, 1992
3. Report Prepared By: Michael L. Parker, Environ. Engr. II
4. Person Contacted and Telephone Number: Mr. David Jones,
[phone].
5. Directions to Site: From the jct. of Hwy. 740 and SR 1719
(Falls Road) in the Town of Badin, travel east on SR 1719 to
the end of the road (the road changes to SR 1727). The Falls
Powerhouse is located at the end of SR 1727.
6. Discharge Point(s), List for all discharge Points:
Latitude: 35° 23' 44"
Longitude: 80° 04' 34"
Attach a USGS Map Extract and indicate treatment plant site
and discharge point on map.
USGS Quad No.: E 18 NE
7. Size (land available for expansion and upgrading): There is
little, if any, area available for the construction of
wastewater treatment facilities.
8. Topography (relationship to flood plain included): The
Powerhouse is located on the main segment of the Yadkin River;
however, the hydroelectric generation facilities are not
subject to flooding.
9. Location of Nearest Dwelling: The nearest dwelling is at
least 1000 feet from the Powerhouse site.

Page Two
10. Receiving Stream or Affected Surface Waters: Yadkin River
a. Classification: WS-IV and B
b. River Basin and Subbasin No.: Yadkin 03-07-08
c. Describe receiving stream features and pertinent
downstream uses: The Yadkin River is used for primary
and secondary recreation and electricity generation.
There are no known water intakes several miles below this
Powerhouse.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater: (MGD)
Outfalls: 001 & 003 002 & 004 005 007
0.432 0.0432 0.4752 0.00072
b. Current permitted capacity: N/A
c. Actual treatment capacity: N/A
d. Description of existing or substantially constructed
treatment works: There are no existing treatment works
nor are any proposed. For domestic wastewater disposal,
employees have an on -site subsurface disposal system.
e. Possible toxic impacts to surface waters: None. There
are no biocides added to the cooling water at this
facility.
d. Pretreatment Program (POTWs only): N/A
2. Residuals handling and disposal scheme: There are no
residuals generated.
3. Treatment Plant Classification: This facility does not meet
the minimum criteria for a class I rating.
4. SIC Code(s): 4911
Wastewater Code(s):
Primary: 48
Secondary: N/A
8. MTU Code(s): N/A
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grants
Funds (municipals only)? No

Page Three
2. Special monitoring requests: None at this time.
3. Additional effluent limits requests: None at this time.
4. Air Quality and/or Groundwater concerns or hazardous materials
utilized at this facility that may impact water quality, air
quality or groundwater? No AQ or GW concerns nor are
hazardous materials utilized at this facility.
PART IV - EVALUATION AND RECOMMENDATIONS
The applicant, Yadkin, Inc. (a subsidiary of ALCOA), operates
a powerhouse (dam) on the Yadkin River known as Falls Powerhouse,
which generates hydroelectric power used in ALCOA's aluminum
manufacturing process. Complex electrical generation machinery
exists at this facility that requires cooling water during
operation.
There have been no changes and/or modifications to this
facility since the Permit was last issued (12/23/92).
It is recommended that an NPDES Permit be renewed as
requested.
Signature of Report Preparer Date
/2(
Water Quality Regi•oral Supervisor Date

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