NC0075027_Staff Report_19930813

cc: Permits and Engineering
Technical Support Branch
({G % 1993
County Health Dept.
Central Files
WSRO 'L hiv1,AL wrrUNT BRANCH
SOC PRIORITY PROJECT: NJ
To: Permits and Engineering Unit
Water Quality Section
Attention: Sean Goris
Date: August 13, 1993
NPDES STAFF REPORT AND RECOMMENDATION
County Forsyth
Permit No. NC0075027
PART I - GENERAL INFORMATION
1. Facility and Address: R. Don Cain Property
P. 0. Box 846
Walkertown, N.C. 27501
2. Date of Investigation: August 12, 1993
3. Report Prepared by: Mike Mickey
Environmental Specialist II
4. Persons Contacted and Telephone Number:
Mr. Don Cain, owner, ph [phone]
5. Directions to Site: The mobile home park is located on
Pinehall Road (SR 1977) north of Walkertown. The entrance
is on the left just across from Judge Clement Road (SR
2006). To reach the WWTP turn left off Pine Hall Road onto
Oak Tree Lane, then left on Oak Branch, then right onto Ben
Lane and left onto Effie Lane. Proceed on Effie Lane to the
next intersection and the WWTP is across the road.
6. Discharge Points(s), List for all discharge points:
Latitude: 360 12' 21" Longitude: 800 09' 07"
U.S.G.S. Quad No. C-18-NW U.S.G.S. Quad Name Walkertown
7. Site size and expansion area consistent with application ?
X Yes No If No, explain:
8. Topography (relationship to flood plain included): The WWTP,
is located adjacent to the creek but above the flood plain
9. Location of nearest dwelling: Mobile homes are located
within 500 ft of the WWTP.

10. Receiving stream or affected surface waters: Ader Creek
a. Classification C
b. River Basin and Subbasin No.: 03-02-01
C. Describe receiving stream features and pertinent
downstream uses: Ader Creek flows through a rural
wooded area approximately 3/4 mile before its
confluence with Lick Creek. A large lake is located on
Lick Creek another mile downstream.
Part II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater to be permitted: 0.045 MGD
(Ultimate Design Capacity)
b. Current permitted capacity of the WWTP? 0.045 MGD.
C. Actual treatment capacity of the current facility
(current design capacity)? The A/C issued 2/8/91 was
for a 0.0432 MGD WWTP system.
d. Date(s) and construction activities allowed by previous
A/C's issued in the previous two years. See C above.
e. Please provide a description of existing wastewater
treatment facilities; The existing facility consists
of the following: aerated 10,000 gallon equalization
basin, bar screen and spiltter box, dual extended
aeration basins, a single clarifier, tertiary filters,
chlorinator, aerated contact chamber, instrumented flow
measurement, and discharge pipe.
f. Please provide a description of proposed wastewater
treatment facilities. NA
g. Possible toxic impacts to surface waters: None known.
h. Pretreatment Program (POTWs only): NA
2. Residuals handling and utilization/disposal scheme:
a. Other disposal/utilization scheme (Specify): Septage
pumper for disposal in a POTW.
3. Treatment plant classification (See attached rating sheet).
Class II facility (45 points).
4. SIC Code(s): 6515 Primary 08
Main Treatment Unit Code: 0 6 1 X 7
NPDES Permit Staff Report
Version 10/92
Page 2

9
PART III - OTHER PERTINENT INFORMATION
1.- Is this facility being constructed with Construction Grant
Funds or are any public monies involved? NA
2. Special monitoring or limitations (including toxicity)? NA.
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. NA for
existing discharge into positive flow stream.
5. Other Special Items: NA
IV - EVALUATION AND RECOM ONDATIONS
The WWTP began operating in October 1992. The system is
currently receiving wastewater from approximately 15 lots.
Another 100 trailers in the subdivision are on individual ground
absorption systems. Work is currently underway on an additional
90 lots that will be tied into the WWTP (Sewer extension permit
No. WQ0004207 issued 3/19/91).
A review of self monitoring data for the period 10/92
through 6/93 shows an average flow of 1,100 gpd with one BOD
violation and two NH3-N violations. The WWTP appears to be well
maintained. It is relevant to note that the system has only one
clarifier and not two as specified in the A/C issued 2/8/91.
WSRO recommends reissuance.
Signature of report prepd11,1
r
R
Water Quality Regional'Supervisor
��j3 93
Date�
NPDES Permit Staff Report
Version 10/92
Page 3

RATING SCALE FOIR CLASSIFICATION OF FACILITIES
Name of Plant.--CIO-As
Owner or Contact Person:_
Mailing Address:
County: Telephone:
NPDES Permit No. NC-0Nondisc. Per. No.
lssueDate: '" %Ws�� Expiration Date:
Existing Facility A o New Facility ON
Rated By: e. `��, Date:
Reviewed (Train. & Cert.) ego. Office
Reviewed (Train. & Cert.) Central Office
O R C_ QcMyk Grade �TC
Plant Class: (circle one) I II III IV Total Points 1b
ITEM POINTS
(5) SECONDARY TREATMENT UNITS
(1) Industrial Pretreatment Units and/or
(a) Carbonaceous Stage
Industrial Pretreatment Program
(i)Aeration - High Purity Oxygen System .....
20
(see definition No. 33)
4
Diffused Air System ...........
10
(2) DESIGN FLOW OF PLANT IN GPD
Mechanical Air System (fixed
(not applicable to non -contaminated cooling waters, sludge
floating or rotor) ..... , , . • , • . • .
8
handling facilities for water purification plants. totally
Separate Sludge Reaeration .....
(i i) Trickling Filter
3
closed cycle systems (def. No. 11). and facilities
consisting only of Item (4) (d) or Items (4) (d) and (11) (d))
High Rate ...................
7
0 •• 20.000..........................
1
Standard Rate .
5
20.001 so.000. . . . .
�
Packed Tower...............
.............
5
50,001 -- 100,000 ................... ... �
' ' '
(i i i) Biological Aerated Filter or Aerated
100,001 -- 250,000..........
250.001 -- 500.000
5
Biological Fitter ....... • • . , , ..........
(iv) Aerated Lagoons
10
..........................
500.001-.1.000,000
..................... .
10
..........................
1.000.001-- 2,000.000
8
(v) Rotating Biological Contactors . .........
10
.....................
2,000.001 (and up) - rate 1 point additional • for each
10
(vi) Sand Fiiters-
200.000 gpd capacity up to a
intermittent biological
2
maximum of 30
Design Flow (gpd)
.....
recirculating biological .....
3
(3) PRELIMINARY UNITS (see definition no. 32)
(a) Bar Screens*
(viii) Stabilization Lagoons ......... . • • • • • • • • •
(viii)Claritier ..............................
r
0
.......................
""""'
O
(ix) Single stage system for combined
or
(b) Mechanical Screens, Static Screens or
carbonaceous removal of BOD and
Comminuting Devices ........' ' ' ' ' '
2
nitrogenous removal by nitrification
(c) Grit Removal ' ' '' ' •
(see def. No. 12) (Points for this item
...............................
or
(d) Mechanical
1
have to be in addition to items (5) (a)
through gh (5) (a) (viri)
or Aerated Grit Removal ..... , , , , •
2
.................
8
•
(e) Flow Measuring Device .......................
1
x Nutrient additions to enhance SOD
)
or.....
(1) Instrumented Flow Measurement ......... • : • .
Q
removal ..... ............... ..
(xi) Biological Culture ('Super Bugs") addition
5
•
(g) Preaeration................................
2
to enhance organic compound removal .....
5
(b) Nitrogenous Stage
(h) Influent Flow -Equalization ............. . . . • , ,
2
(i) Aeration - High Purity Oxygen System .....
20
(i) Grease or Oil Separators - Gravity ..........
2
Diffused Air System ...........
10
Mechanical .
3
Mechanical Air System fixed
Y (
Dissolved Air Flotation.
8
floating, or rotor) ...... ......
8
{j) Prechlorinalion ...........................
S
Separate Sludge aeaeralion .....
3
' ' ' ' ' ' ' ' '
(if) Trickling Filter -
(4) PRIMARY TREATMENT UNITS
High Rate ..............
7
(a) Septic Tank (see definition no. 43) ..............
2
Standard Rate ............
5
(b) Imhoff Tank ..................................
' ' '
(c) Primary Clarifiers .................
5
5
Packed Tower ....:.......
(i i i) Biological Aerated Filter or Aerated
5
..........
(d) Settling Ponds or Settling Tanks for •Inorganic
Biological Filler .
(iv) Rotating Biological Contactors. •..
10
Nontoxic Materials (sludge handling facilities
.........
(v) Sand Filter -
10
for water purification plants, sand, gravel,
stone. and other mining operations except
intermittent biological ..... , , ,
2
recreational activities such as gem or gold'
recirculating biological ........
3
mining) ......................................
2
(vi) Clarifier . ...............................
5

(6) TERTIARY OR ADVANCED TREATMENT UNIT
{a) Activated Carbons Beds -
without carbon regeneration .................. 5
with carbon regeneration .................... 15
(b) Powdered or Granular Activated Carbon Feed -
without carbon regeneration ................. 5
with carbon regeneration .................... 15
(c) Air Stripping ............................. 5
(d) Denitrilication Process (separate process) ..... 10
(e) Electrodialysis .............................. 5
(t) Foam Separation ............................. 5
(9) Ion Exchange ............. :.................. 5
(h) Land Application of Treated Effluent
(see definition no. 22b) (not applicable for
sand. gravel, stone and other similar mining
operations)
(I) on agricirlturally managed sites (See def.
No.4) ............................... 10
QQ by high rate infiltration on non -agriculturally
managed sites (includes rotary distributors
and similar fixed nozzle systems) ........... 4
(Ili) by subsurface disposal (includes low pressure
pipe systems and gravity systems except at
plants consisting of septic lank and nitrifica-
tion lines only) ............................. 4
C) Microscxeens.................................. 5
(j) Phosphorus Remoial by Biological Processes
(See def. No. 26) ............................ 20
(k) Polishing Ponds - without aeration ....... 2
with aeration .......... 5
(1) Post Aeration . cascade .............. 0
diffused or mechanical ... 5
(m) Reverse Osmosis ............................... 5
(n) Sand or Mixed -Media Fillers - low rate ........... T
high rate ..........
(o) Treatment processes for removal of metal or
cyanide .................................... 15
(p) Treatment, processes for removal of toxic
materials other than metal or cyanide ......... 15
SLUDGE TREATMENT
(a) Sludge Digestion Tank - Heated ............... 10
Aerobic ............... Q
Unheated ............. 3
(b) Sludge Stabilization (chemical or thermal) ....... 5
(c) Sludge Drying Beds - Gravity.......... 2
Vacuum Assisted ....... 5
(d) Sludge Efuldation ............................. 5
(e) Sludge Conditioner (chemical or thermal) ........ 5
(f) Sludge Thickener (gravity) ...................... 5
(g) Dissolved Air Flotation Unit
(not applicable to a unit rates as (3) (ij ......... 8
(h) Sludge Gas Utilization (including gas storage) .... 2
(i) Sludge Holding Tank - Aerated ................ 5
Non -aerated ............ 2
(j) Sludge Incinerator - (not including activated
carbon regeneration) ..... 10
(k) Vacuum Filler. Centrifuge or Filter Press or other
similar dewalering devices .................... 10
(8) SLUDGE DISPOSAL (including incinerated ash)
(a) Lagoons ........................................ 2
(b) Land Application (surface and subsurface)
(see definition 22a)
-where the facility holds the land app. permit ... 10
-by contracting to a land application operator who
holds the land application permit ................ 2
-land application of sludge by a contractor who does
.not hold the permit for the wastewater treatment
facility where the sludge is generated 10
(c) Landfilled (burial) ............................. 5
(9) DISINFECTION
(a) Chlorination .. ..................... ......
(b) Dechlorinalion ........................
(c) Ozone .............................. 5
(d) Radiation .......................... 5
(10) CHEMICAL ADDITION SYSTEM (S) (See definition No. 9)
(not applicable to chemical additions rated as item
(3) 0). (5) (a) (xi). (6) (a). (6) (b)• (7) (b)• (7) (e)•
(9) (a). (9) (b). or {9) (c) 5 points each: List:
5
.... 5
.... 5
..... 5
(11) MISCELLANEOUS UNITS
(a) Holding Ponds. Holding Tanks or Settling Ponds
for Organic or Toxic Materials Including wastes
from mining operations containing nitrogen and/or
phosphorous compounds In amounts significantly
greater than Is common for domestic wastewater .......... 4
(b) Effluent Flow Equalization (not applicable to storage
basins which are inherent in land application systems). 2
(c) Stage Discharge (not applicable to storage basins
inherent in land application systems ... »................... .....
(d) Pumps.»........».» »».».�..._..»..»..»...»»..».»»....»...........�»
(e) Stand -By Power Supply».»...»... .........»_»»..».....»...__......_».... 3
(1) Thermal Pollution Control Device:...»...»..........»...»...»............ 3
TOTAL POINTS
CLASSIFICATION
ClassI.....»»......».»........»»»»»»»..»»»»».»» Points
Class II.......»».»»....».»..»».....» »» k 5��oints
Class III.......»».»......»....»...»»»»»».»»....... 51. 65 Points
Class IV............»» ............... 66- Up Points
Facilities having a rating of one through four points. inclusive.
do not require a certified operator. Classification of all other
facilities requires a comparable grade operator In responsible
charge.
Facilities having an activated sludge process will be assigned
a minimum classification of Class II.
Facilities having treatment processes for the removal of metal
or cyanide will be assigned a minimum classification of Class 11.
Facilities having treatment processes for the biological removal
of phosphorus will be assigned a minimum classification of Class
I11.
In -plant processes and related control equipment which are an
integral part of industrial production shall not be considered waste
treatment. Likewise. discharges of wastewater from residences
having a design flow of 1.000 gpd or less, shall not be subject to
rating.
ADDITIONAL COMMENTS;