NC0031836_Instream Assessment_19900628

NPDES DOCUHENT :MCANNINO COVER SHEET
NPDES Permit:
NC0031836
Fourth Creek WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
June 28, 1990
This document is printed on reuse paper - ignore any
content on, the reverse side

Memorandum
To:
From:
Through:
DIVISION OF ENVIRONMENTAL MANAGEMENT
Rex Gleason
Susan A. Wilson
Trevor ClementsX,
Carla Sanderson
June 28, 1990
Subject: Instream Assessment
City of Statesville -Fourth Creek
NPDES Permit No. NC0031836
Iredell County
SOC No. 90-38
Summary and Recommendations
Technical Support has received the request for an instream assessment for the City of Statesville
and has completed the review of the Fourth Creek Wastewater Treatment Plant (WWTP).
Statesville -Fourth Creek wishes to increase their flow by 300,000 gallons per day, not to exceed
their current design flow of 4 MGD. The City also requests that their toxicity limit be modified to
monitoring only, since the facility is currently out of compliance with regard to this parameter.
EMC criteria state that no industrial sources should be added under an Order. DEM has interpreted
this as "no toxics in toxic amounts". Therefore, it is recommended that this SOC be limited to
domestic type waste additions only. Technical Support suggests that milestones be incorporated in
the Order so that the facility will be in compliance with their whole effluent toxicity limit upon
expiration of the Special Order of Consent. Monthly whole effluent toxicity monitoring is
recommended during the life of the Order. The region may wish to consider periodic "full range"
toxicity monitoring to establish progress made toward final compliance if failures at the "pass/fail"
level continue. In addition, the City should update their headworks analysis as stated in the
attachment.
Background Information
The City of Statesville discharges into Fourth Creek, which is a class "C" stream in the Yadkin
River Basin. The drainage area at the point of discharge is 46.5 square miles. The 1984 USGS
flows used in the most recent wasteload allocation are as follows: 7Q10 = 11.0 cfs (summer),
average stream flow = 46.0 cfs.
Statesville, Fourth Creek, WWTP is required to conduct a chronic quarterly pass/fail test at an
instream waste concentration (IWC) of 36% at the design flow of 4 MGD. The City has been
performing monthly toxicity testing and conducting various bench scale operations in order to find
the cause of their whole effluent toxicity. Statesville has reported failures every month for the past
year with the exception of February and April of this year and with no test being reported for
December 1989. Toxicity tests for March (fail) and April (pass) 1990 were conducted at an
instream waste concentration of 46%, which is the facility's IWC upon expansion above 4 MGD.

The City has recently updated their headworks. However, the facility should update their
headworks analysis using new pretreatment monitoring information (see attached schedule).
Cadmium and Lead should be scrutinized since these parameters will be limited upon expansion
above 4 MGD.
Analysis and Discussion
A mass balance analysis was conducted for both lead and cadmium at the design flow of 4 MGD.
The total allowable effluent level for cadmium, if it were a limited parameter, was found to be
5.5 µg/1 based on a State chronic criteria of 2 µg/1. Compliance data show values of 5.0 µg/1 and
4.6 µg/1 cadmium for the months of February and March, respectively. The average flows for
these months were 3.6 and 3.3 MGD. Since cadmium will be a limited parameter when flow
exceeds 4 MGD, Statesville should make efforts to reduce its discharge in the effluent.
The total allowable level for lead, at 4 MGD using a State chronic criteria of 25 µg/l, was found to
be 69 µg/l. Statesville's discharge monitoring report forms indicated that lead levels were below a
detection level of 50 µg/1. Future adherence to a lead limit should not be a problem for the facility,
although Statesville may wish to use a method which will detect lead at levels below 50 µg/1 to
relieve any concerns of possible violation when the plant expands its flow.

1. Conduct and submit industrial waste survey for the purpose
of identifying the sources of toxic pollutants being discharged
to the wastewater treatment fac i 1 ity . (&o w {.5)
2. Submit a plan for a monitoring program to collect site
specific data needed to complete a headworks analysis (HWA).
This program shall cover the data needed to immediately update
the City's HWA as well as the long term monitoring needed for
future HWA updates . (3o DAWs)
3. Revise the monitoring program (based on DEM comments
received within 45 days of monitoring program submission) .(3o y5)
4. Implement the monitoring program as revised based on DEM
comments..
5. After implementation of the "Immediate Update" portion of
the long term monitoring program, conduct and submit a Headworks
analysis (HWA) for DEM approval. 045 vA,ys)
6. Review the results of the HWA and modify the City's sewer
use ordinance (SUO) limits and pretreatment permit limits as
necessary.
7. Develop and submit to DEM for approval an enforcement
management strategy (EMS).
8. Revise the EMS (based on DEM comments received within 45
days of EMS submission).
9. Implement the EMS as revised based on DEM comments.
10. Modify the City's SUO as necessary to allow for
implementation of the EMS.
If you have any questions on this matter or require any further
information, please let me know.
1;

MEMORANDUM TO:
FROM:
PREPARED BY:
DIVISION OF ENVIRONMENTAL MANAGEMENT
June 6, 1990
Carla Sanderson
VC
D. Rex Gleason P
Richard Brid eman
SUBJECT: Request for Instream Assessment
City of Statesville - Fourth Creek WWTP
NPDES Permit No. NC 0031836
Iredell County, N.C.
Please find attached a request for an Instream Assessment for
the subject facility. The request is made to provide a basis for
allowing additional flow in excess of current 12-month averages.
Attachments
RMB/bb
RECEVED
JUN 0 3 1990
TECHNICAL SUPPORT `RANCH

Request Form for In -stream Assessment for 67B
NAME OF FACILITY: City of Statesville - Fourth Creek WWTP
SUBBASIN: YAD 06 COUNTY: Iredell REGION: Mooresville
DESIGN FLOW: 4.0 RECEIVING STREAM: Fourth Creek
BACKGROUND DATA:
A. Why is SOC needed? (Facility is out of compliance with
which effluent limits?)
Facility is noncompliant with Chronic Toxicity.
B. History of SOC requests:
1. Monthly Average waste flow
prior to any SOC
Time period averaged 4/89 thru 3/90
2. Previously approved SOC's: N/A
3. Flows lost from plant
(facilities that have gone
off line)
4. Current SOC request
5. Total plant flow post-SOC
(sum of original flow and
SOC flow minus losses)
3.2366 mgd
flow: N/A
0.3143
flow: 0. 4 mgd
flow: 4.0000 mgd
6. Is this an accurate flow balance for plant? Why/why
not?
N/A
C. Please attach DMR summary for past year for all permitted
parameters. If possible, include reports from previous
years if facility has been under SOC for more than a year.
Summary attached.

CURRENT SOC REQUEST:
A. Request is for domestic or industrial waste? If it is a
combination, please specify percentages.
Unspecified domestic -strength waste.
B. What type of industry? Please attach any pertinent data.
N/A
C. The region proposes the following SOC limits:
Summer Winter
*Flow 4.0 mgd 4.0 mgd
*BODS 17.0 mg/1 27.0 mg/1
*NH3 12.0 mg/1 18.0 mg/1
*DO (min) 5.0 mg/1 5.0 mg/1
*TSS 30.0 mg/1 30.0 mg/1
*fecal coliform 1000.0 #/100m1 1000.0 #/100m1
*pH 6.0-9.0 SU 6.0-9.0 SU
*Chromium 0.116 mg/1 0.116 mg/1
*Cyanide 0.014 mg/1 0.014 mg/1
Toxicity Monitoring Only
* Denotes no change from Permit.
D. What is the basis for these limits?
The only change under the SOC will be a monitoring only
requirement for Chronic Toxicity. This is current policy.

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INSTREAM SELF -MONITORING DATA
MONTHLY AVERAGES
IrLystu
rF76.s/iu.No.: NC0031 S
.E - �t � (T . Permit 3
Discharger:
Receiving Stream: Sub -basin:
Upstream Location: Downstream Location
GF�u-t JT
Wet -ream Downstream
DATE T,T D.O. GODS COND TEMP D.O. BOD5 COND
DEC-90
NOV-90
OCT-90
SEP-90
AUG-90
JUL-90
JUN-90
1 Y-90 .4p,06 /e
APR-90 <o. oc
MAR-90 o
FEB-90 %01
JAN-90 4, oc
DEC-89 0
NOV-89
OCT-8 9 4/,.
SEP-8 9 --, /1--
AUG-89
JUL-89 - Ds'-
JUN-89
MAY-89
APR-89
MAR-89
FEB-89
JAN-89
DEC-88
NOV-88
OCT-88
SEP-88
AUG-88
JUL-88
JUN-88
MAY-88
APR-88
MAR-88
FEB-88
JAN-88
DEC-87
NOV-87
OCT-87
SEP-87
AUG-87
JUL-87
JUN-87
MAY-87
APR- 8 7
MAR-87
FEB-87
JAN- 8 7