NC0074900_Staff Report_19960718

SOC PRIORITY PROJECT: No
To: Permits and Engineering Unit
Water Quality -Section - �o
Attention: Greg Nizioti Q'
Date: July 18, 1996 r
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NPDES STAFF REPORT AND RECOMMENDATIONS
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County: Iredell -
NPDES Permit No.: Nr_.0074900
MRO No.: 96-144 0
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PART I - GENERAL INFORMATION
1. Facility and Address: Knotts Landing Subdivision WWTP
c/o Mid South Water Systems, Inc.
Post Office Box 127
Sherrills Ford, N.C. 28673
2. Date of Investigation: July 17, 1996
3. Report Prepared By: Michael L. Parker, Environ. Engr. II
4. Person Contacted and Telephone Number: Kim Colson, (704)
478-2785.
5. Directions to Site: The proposed entrance to the site is on
the left (south) side of Hwy. 150 x 0.5 mile west of the
jct. of hwy. 150 and SR 1168 (Doolie Rd.) in southwestern
Iredell County.
6. Discharge Point(s), List for all discharge Points: -
Latitude: 35° 36' 17"
Longitude: 80' 56' 35"
Attach a USGS Map Extract and indicate treatment plant site
and discharge point on map.
USGS Quad No.: E 15 SW
7. Site size and expansion area consistent with application:
Yes. Sufficient area exists to construct the proposed WWTP
and limited expansion (-- 3.5 acres).
8. Topography (relationship to flood plain included): The WWTP
site is not located within a flood plain or below the high
water elevation of Lake Norman.
9. Location of Nearest Dwelling: There are no existing e
dwellings within 500± feet of the proposed WWTP site.
Development should be restricted to no closer than 200 feet
of the WWTP site. Encroachment within this area would
require the addition of approved noise reduction buffers.

Page Two
10. Receiving Stream or Affected Surface Waters: Lake Norman
(Catawba River).
a. Classification; WS-IV, B CA
b. River Basin and Subbasin No.: Catawba 030832
C. Describe receiving stream features and pertinent
downstream uses: The receiving stream (lake) is used
for both primary and secondary recreation with frequent
bodily contact. The discharge will enter the main
channel of the Catawba River.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater: 0.300 MGD (Design Capacity)
b. What is the current permitted capacity: 0.041 MGD
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: N/A
f. Description of proposed WWT facilities: For phase I of
this project, the proposed WWT facilities will consist
of two (2) 0.050 MGD "package type" extended aeration
WWTPs connected in parallel with tertiary filters,
disinfection, and dechlorination.
g. Possible toxic impacts to surface waters: Chlorine will
be utilized for disinfection, however, dechlorination
will be provided.
h. Pretreatment Program (POTWs only): N/A
2. Residual handling and utilization/disposal scheme:
Residuals are to be removed by a septage hauler and taken to
a CMUD WWTP for disposal.
3. Treatment Plant Classification: Class II (based on proposed
treatment facilities).
4. SIC Code(s): 4952
Wastewater Code(s): 05
5. MTU Code(s): 06107.
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved (municipals only)?
No

Page Three
Special monitoring or limitations (including toxicity)
requests: Recommend monitoring only for TN and TP.
Important SOC/JOC or Compliance Schedule dates: N/A
Alternative Analysis Evaluation
a. Spray Irrigation: Insufficient area, poor soils. The
existing WWTP site is a former spoils area for a now
defunct quarry. Adjacent property is either unavailable
or is restricted by topography for on -site disposal.
b. Connect to regional sewer system: There are no
immediate plans by the Town of Mooresville or Iredell
County to serve the proposed development with sewer.
C. Subsurface: Insufficient area, poor soils (see 4a.
above).
PART IV - EVALUATION AND
IONS
The permittee has requested a Permit modification to not
only relocate the proposed WWTP from the originally permitted
location, but also to relocate the proposed point of discharge.
Plans are for the yet -to -be -built WWT facility to serve the
proposed Knotts Landing development as well as the wastewater
from both existing and proposed restaurants, and a 100 unit
apartment complex. Since development pressure is high in this
area, additional flow from other sources can be expected once the
WWTP is in operation.
Upon completion of this facility, the WWTP serving the Pier
16 Marina (NC0074535) will be abandoned and all wastewater
treated by the Pier 16 WWTP will be pumped to the proposed Knotts
Landing WWTP for treatment.
There is an existing development within the service area of
the pro WWTP, which has been issued an NPDES
Permit (Pinnacle Shores - AC007635Z-n Although this development
is well un er construction, exis ing homes are being served by
on -site septic systems, which means the developer - Crescent
Resources, Inc. may not have any further need for the NPDES
Permit. Should Mid -South's modification request be approved, and
at a later time Crescent attempts to renew the aforementioned
Permit, the Division should advise Crescent that a "regional" WWT
facility has been permitted and encourage Crescent to not create
another outfall.

Page Four
Pending a final technical review by the TSB and P&E, it is
recommended that the request to modify the Permit be approved:
Signature Report Preparer Date
e-,,e- A", , 71
Water Quality dkegional Supervisor Date
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- State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
Mr. Kim Colson, P.E.
Mid South Water Systems, Inc.
P.O. Box 127
Sherills Ford, North Carolina 28673
Dear Mr. Colson:
EWYWA
C)EHNR
June 19, 1996
Subject: Permit Modification - Add. Info.
NPDES Permit NCO074900
Mid South Water Systems, Inc.
Knotts Landing
Iredell County
This is to acknowledge receipt of the following documents on May 7, 1996:
• NPDES Permit Application Short Form D
• Request for permit modification to 0.30 MGD and relocation of the discharge point
• Application Processing Fee of $400.00
• Engineering proposal
• General location map and scale location map
The following information is needed prior to finalization of this request:
• Further evaluation of non -discharge alternatives. Since this request is for a wastewater flow of 0.30
MGD, the evaluation conducted for 0.041 MGD (permitted in 1995) is not sufficient. The following
points need to be addressed:
* Feasibility of consolidating discharges with the Permittee's Pier 16 wastewater treatment plant
(NC0074535) should be considered since the relocated discharge point is in close proximity to the Pier
16 outfall location. The required expansion of the Pier 16 plant should be evaluated under this
scenario.
* The June 6, 1994 letter from B.K. Barringer & Associates to Mr. Dave Goodrich dismissed
community -type non -discharge disposal alternatives without sufficient documentation. This is not
acceptable for this expansion. Each option must be evaluated for soil characteristics, with an economic
analysis provided for all feasible options. Adjacent land (i.e. not under current ownership by the
Permittee) must also be considered when evaluating non -discharge disposal options. Guidance is
enclosed delineating the extent of soils analysis required. Also, the original evaluation was for a 100-
lot subdivision. It is not clear from the information provided if that property has been developed at this
time and/or if other sites are under consideration for sewer service by the proposed facility at this time.
* Up-to-date letters from both Iredell County and the Town of Mooresville must be provided
indicating the present status of available sewer in this vicinity.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ to% post -consumer paper

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