NC0047091_STAFF REPORT_20031204

NPDES DOCUMENT SCANNING COVER SHEET
8 NPDES Permit: NC0047091
Silver Maples WWTP
Document Type: Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Speculative Limits
Report
' Instream Assessment (67B)
aEnvironmental Assessment (EA)
' Permit
History
Document Date: December 4, 2003
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SOC PRIORITY PROJECT: NO
To: Permits and Engineering Unit
Water Quality Section DEC 8 2003
Attention:—Charles-Weaver
Date: December.4, 2003
NPDES STAFF REPORT AND RECOMMENDATIONS
County: Cabarrus
NPDES Permit No.: NC0047091
MRO No.: 03-071
PART I - GENERAL INFORMATION
1. Facility and address: Silver Maples Mobile Estates WWTP
2812 Plantation Road
Harrisburg, North Carolina 28057
2. Date of investigation: August 4, 2003
3. Report prepared by: B. Dee Browder, Environ. Eng. I
4. Person contacted and telephone number: Eddie Turner, [phone]
5. Directions to site: From the jct. of Hwy. 29 and Pitt School Road, northeast of the
Town of Harrisburg, travel west on Pitt School Road approximately 1 mile to the
junction with Plantation Road. Turn right on Plantation Road and proceed to the
intersection with Darwin Road. Turn left on Darwin Road and Travel 200 feet to
the WWTP.
6. Discharge point(s), List for all discharge points: -
Latitude: 35 22' 12"
Longitude: 80 41' 00"
Attach a USGS Map Extract and indicate treatment plant site and discharge point
on map. N/A
USGS Quad No.: F 16 SW Harrisburg, NC
7. Site size and expansion area consistent with application: Yes.
8. Topography (relationship to flood plain included): Facility is located in the 100
year flood plain. Slopes range from 8 to 10%.

Page Two -
9. Location of nearest dwelling: Approx. 300 feet from the WWTP site.
10. Receiving stream or affected surface waters: Rocky River
a. Classification: C
b. River Basin and Subbasin No.: Yadkin 03-07-11
C. Describe receiving stream features and pertinent downstream uses: This
receiving stream has considerable flow. There are other discharges located
downstream of this facility (NC0063762). General C classifications uses
downstream.
PART H-DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater: 0.04 MGD (Design Capacity)
b. What is the current permitted capacity: 0.04 MGD
C. Actual treatment capacity of current facility (current design capacity):
0.04 MGD
d. Date(s) and construction activities allowed by previous ATCs issued in the
previous two years: N/A
C. Description of existing or substantially constructed WWT facilities: The
existing WWT facilities consist of a contact stabilization wastewater
treatment plant, which includes a grit/surge tank followed by primary
clarification, aeration, re-aeration, final clarification, chlorination, effluent
flow measurement and an aerated sludge holding tank.
f. Description of proposed WWT facilities: N/A
g. Possible toxic impacts to surface waters: There are no toxic impacts
expected. Chlorine is added to the waste stream
It. Pretreatment program(POTWs only): Not Needed.
2. Residual handling and utilization/disposal scheme: Residuals are pumped by Liquid
Waste, Inc and disposed of at the Rocky River Wastewater Treatment Plant.
a. If residuals are being land applied specify DEM Permit No. N/A.
Residuals contractor: N/A
Telephone No. ( )N/A
b. Residuals stabilization: PSRP PFRP N/A
c. Landfill: N/A
3. Treatment plant classification: Class II (no change from previous rating).

Page Three
4. SIC Code(s): 4952 Wastewater Code(s): 05
5. MTU Code(s): 04524
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant Funds or are any public
monies involved (municipals only)? No
2. Special monitoring or limitations (including tonicity) requests: None at this time.
3. Important SOC/JOC or compliance schedule dates: N/A
Submission of plans and specifications
Begin construction
Complete construction
4. Alternative analysis evaluation
a. Spray irrigation: N/A
b. Connect to regional sewer system: May be available.
C. Subsurface: N/A
d. Other disposal options: N/A
PART IV - EVALUATION AND RECOMMENDATIONS
Proper signs for notification in the event of a problem should be installed at the pump
stations associated with this plant's collection system. There are significant indications of
poor collection system infrastructure. A municipal collection system line is within 300 feet
of this facility. It is recommended that this facility connect to the municipal collection
system. The wastewater treatment plant is in very poor physical condition with rusted
walking grates and damaged security fencing. It is located in a very low area and is
subject to flooding. This office recommends renewal of the permit but also recommends
that the facility owner address the condition of the collection system and the WWTP
facility's physical condition.
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Signature of Report
fPreparer lbate
Water Quality Regional Supervisor Date
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