NC0081426_staff report_19950809

CC: Permits and Engineering
Technical Support Branch
County Health Dept.
Central Files
WSRO
SOC PRIORITY PROJECT: Yes
To: Permits and Engineering Unit
Water Quality Section
Attention: (Jeanette Powell)
Date: 8-9-95
NPDES STAFF REPORT AND
No X
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County Guilford_
Permit NCO081426
PART I - GENERAL INFORMATION
1. Facility and Address: N.L. Mitchell Water Filtration Plant
Mailing address: Location:
Ray E. Shaw, Jr. 1041 Battleground Ave
PO Box 3136 - Utilities Dept. Greensboro, NC
Greensboro, NC 27402
2. Date of Investigation: 8-9-95
3. Report Prepared by: Bill Justice, DEM, WSRO, WQ.
4. Persons Contacted and Telephone Number: James Moorefield,
Water Supply Superintendent [phone]. Ray Shaw,
Public Utilities Manager [phone] (not contacted).
5. Directions to Site: I-40 East to Greensboro. Take Wendover
Ave. East to Battleground Ave.. Follow Battleground Ave.
East to Benjamin Parkway. Plant is on Benjamin Parkway on
right (at the corner junction of Battleground and Benjamin).
6. Discharge Points(s), List for all discharge points:
Latitude: 360 04' 53" Longitude: 790 48' 12"
U.S.G.S. Quad No. C19SE U.S.G.S. Quad Name Greensboro
7. Site size and expansion area consistent with application ?
X Yes No If No, explain: No expansion of the
facility is expected.
8. Topography (relationship to flood plain included): The site
is above the flood plain with slopes varying from 1 to 50.
9. Location of nearest dwelling: Over 500 feet +/- from.W
Ptwo--TED

10. Receiving stream or affected surface waters: North Buffalo
Creek.
a. Classification: C-NSW
b. River Basin and Subbasin No.: Cape Fear; 03-06-02
C. Describe receiving stream features and pertinent
downstream uses: The stream flows through a city park
and then through part of Greensboro. Cone Mill's and
North Buffalo WWTP.both discharge into this creek.
Part II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater to be permitted: The current
permit does not have a Flow limit, it only requires
monitoring of the discharge. Usually, the maximum
volume of water generated daily as a result of filter
backwash, is approximately 650,000 gallons. This
volume varies depending oJN the amount of treated water
the plant is generating but, 650,000 gallons would
normally be the maximum.
b. What is the current permitted capacity of the Waste
Water Treatment facility? No flow limit - see question
above.
C. Actual treatment capacity of the current facility? As
explained above, the volume of water discharged daily
will vary. The clarifier/settling basin used to treat
the filter backwash is approximately 350,000 gallons.
This basin should be able to adequately treat the
filter backwash volumes described above.
d. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years. None.
e. Please provide a description of existing or
substantially constructed wastewater treatment
facilities; Filter backwash water from the water plant
is pumped to an existing clarifier/settling basin
(approximately 350,000 gallons). After solids settle,
the water is discharged to the receiving stream.
Settled solids are pumped to the sanitary sewer. The
alum sludge and wash water generated during washing of
the sedimentation basins (one basin is washed each
weekend) goes to the city sanitary sewer.
f. Please provide a description of proposed wastewater
treatment facilities. None.
NPDES Permit Staff Report
Version 10/92
Page 2

g. Possible toxic impacts to surface waters: None known.
2. Residuals handling and utilization/disposal scheme: Settled
solids are pumped to the City Sanitary sewer system.
3. Treatment plant classification: Class I.
4. SIC Code (s) : 4941
Primary 21 Secondary
Main Treatment Unit Code: 5 0 0 x
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved? N/A.
2. Special monitoring or limitations (including toxicity)
requests: None.
3. Important SOC, JOC or Compliance Schedule dates: None.
4. Alternative Analysis Evaluation: Has the facility evaluated
all of the non -discharge options available. Please provide
regional perspective for each option evaluated.
Spray Irrigation: N/A.
Connection to Regional Sewer System: N/A.
Subsurface: N/A.
Other disposal options:
5. Other Special Items:
PART IV - EVALUATION AND RECOMMENDATIONS
Currently, the water treatment plant is discharging the filter
backwash to the sanitary sewer system because effluent from the
clarifier/settling basin will not meet the Total Suspended Solids
and Settleable Solids limits in the permit. The plant personnel
are presently experimenting with a floating pump which should
pump clear supernate from the basin and meet the permit limits in
the near future.
NPDES Permit Staff Report
Version 10/92
Page 3

WSRO recommends renewal of NPDES Permit NC0081426 in accordance
with current Division policy.
0. 1:S6= 4/)- ffl- f -
Signature of re ort prepaff6r
ter Quality Reg' a Supervisor
Date
NPDES Permit Staff Report
Version 10/92
Page 4

9
RATING SCALE FOR CLASSIFICATION OF WATER POLLUTION CONTROL' SYSTEMS
Name of Facility: r , 1
Owner or Contact Person:
Mailing Address:. l
County: 9� Zg&C&-Ltd
Present Classification;,,
NPDES Per. No. NC Q z Nondisc. Per. No.WQ Health Dept -Per No...,.
o�
Rated by: T
aej /- f�� Date:elephone:—g=
Reviewed by: Health Dept. Telephone:
egionalOffce Telephone:
Central Office Telephone:
ORC• %sc 14 Grade: 7elephene: 3 7 *3 5
Check Classification(s): Subsurface _ Spray Irrigation Land Application
Wastewater Classification: (Circle One) T n III IV Total Points. F lw
WA SII WALE CULISFICA'f M
;d +at!unitsk t app1�
tanks
? pump !oaks
3....siphon or pump -dosing systOns
aww Biters
5`__9reass trapfrnteroeptor
&...eWwwor separators
7`_9ravhy subsurface moment and disposal:
&,._pressure subsurface trsafme d and dispass :
Im
Telephone-�
Facility Existing Facility_
$PRAY ff VGKI CLASSFICATION
(died* all unit; that apply)
1`�preliminary treatment (deftWon M. 32 )
ilegoons
3,.,__septic tanks .
4,. PAT twits
6,,.__.PAVG
8`_sand filters
.„__grease trapJinterceptor
2,_..oll/waler separators
9...�dlslnteotion
10,...__et+emical addition for nutrlentlalgae Control
11'__apray irrigation of wastewater
In addition to the ebove etasslflcatlons.. pretrsatmsnt of Mast• *&ator in i h oss an appropriate these
dui onents erttflcat ell.
be rated using the point rating system and will require on op
LAND APPLICATIONMESIDUALS CLASSIFICATION (Applies only to permll holder) Hated site.
!. ^__Land apprcat+on of biosdrds. residuals or contaminated soils on a desig
wAVIMATERTREATMI34T FACILM CLASUF104TIM .
The following systems shaft be assigned a Class 1 dass!lication. unless Mw flow h of a 93901cant quanttty or the technology is unusunfly
Complex. to require consideration by the Commission on a case -by -case basis: (Chid* If Approprime)
1 ..Wwater Separator Systems owWding only cl physical separation, pumps and disposal:
g�—Septic TanWSand Filter Systems consisting only of septic tanks, dosing apparatw. pumps.sand titters. Qiskdeaion
wd direct disdiarge: oons. d�slnfeation. necessary ehsmkW treatment for
3 _Ugoon Systems consisting only of preAmlresry tresimant. lag pumps. .
algae or nutrient control, and diced discha":
4L__Ciosed-1oop Recycle Systems; air -stripping• Carbon a�qAion, disinlec Wn
it roundwaier Remediation Sydems Consisting only of odWOf separators, pumps.
.and &Vol*al:
Aquacutture operations whh discharge to surface wafers
t='Waier Plant sludge handling and back -wash water treatment:
,,__._Seafood prooessing consisting of screening and dIsp=ai. *111 be classified d permitted after July 1.
9�_,�Singto4amily discharging systems. with the exception of Aerobic Treatment Units.
1993 or tf upon tnspedion by the Division. It Is found that the system Is not being adequately operated or mairdalned. Sud
systems will be notified of the classification or reclassification by the Commission. in wdit-