NCG510207_staff Report_19940623

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SOC PRIORITY PROJECT: Yes No X
To: Permits and Engineering Unit
Water Quality Section
Attention: Jay B. Lucas
Date: June 23, 1994
NPDES STAFF REPORT AND RECOMMENDATION
County: Mecklenburg
MRO No.: 94-154
Permit No. NCG510207
PART I - GENERAL INFORMATION
1. Facility and Address: Colonial Pipeline Company
Post Office Box 87
Paw Creek, North Carolina 28130
2. Date of Investigation: 05-17-94
3. Report Prepared By: Samar Bou-Ghazale, Env. Engineer I
4. Persons Contacted and Telephone Number: Mr. Steve Trimberger,
Terminal Manager; [phone]
5. Directions to Site: From the junction of Highway I-85 and
Highway 27 in Charlotte, travel west on Highway 27 (Freedom
Drive) approximately three (3) miles to Old Mt. Holly Road.
Turn right onto Old Mt. Holly Road and travel approximately
0.2 mile to intersection with Kenstead Circle. Proceed on
Kenstead Circle approximately 200 feet. The entrance to
Colonial Pipeline Company is located on the left side of the
road.
6. Discharge Point(s). List for all discharge points:
Latitude: 350 17' 17" Longitude: 800 561 '08"
Attach a U.S.G.S. map extract and indicate treatment facility
site and discharge point on map.
USGS Quad No.: F 15 SW USGS Quad Name: Mountain Island Lake
7. Site size and expansion are consistent with application?
Yes X No If No, explain:
8. Topography (relationship to flood plain included): Moderately
hilly, with slopes of 3 to 7%. The site is not located in a
flood plain.

Page Two
9. Location of nearest dwelling: None within 500 feet of the
discharge point.
10. Receiving stream or affected surface waters: Unnamed
tributary to Gum Branch.
a. Classification: C
b. River Basin and Subbasin No.: Catawba River Basin;
030834
C. Describe receiving stream features and pertinent
downstream uses: Discharge will take place into an
unnamed tributary to Gum Branch. The receiving stream
flows through a low density community with the downstream
uses typical of Class C waters.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted: 0.0648 MGD
b. What is the current permitted capacity of the wastewater
treatment facility? N/A.
C. Actual treatment capacity of the current facility
(current design capacity)? N/A.
d. Date(s) and construction activities allowed by previous
Authorizations to Construct issued in the previous two
years: N/A
e. Please provide a description of existing or substantially
constructed wastewater treatment facilities: N/A
f. Please provide a description of proposed wastewater
treatment facilities: The proposed groundwater
treatment system will consist of monitoring wells,
recovery wells, oil/water separator, diffused air unit,
and an activated carbon adsorption unit.
g. Possible toxic impacts to surface waters: Due to nature
of the wastewater there could be some toxicity concern.
h. Pretreatment Program (POTWs only): N/A.
2. Residuals handling and utilization/disposal scheme: Generation
NPDES Permit Staff Report
Version 10/92
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of residuals is not expected.
3. Treatment plant classification (attach completed rating
sheet): Proposed, no rating given.
4. SIC Code(s): 5171
Primary: 53
Main Treatment Unit Code: 53000
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved (municipals only)?
N/A.
2. Special monitoring or limitations (including toxicity)
requests: Toxicity may need to be monitored and/or limited.
3. Important SOC, JOC or Compliance Schedule dates: (please
indicate) N/A.
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: This option has been evaluated and found
not to be an alternative.
Connection to regional Sewer System: The Mecklenburg County
POTW will not accept treated groundwater from the above site.
Discharge to an infiltration gallery: The use of an
infiltration gallery was evaluated and found not to be an
alternative.
5. Air Quality and/or Groundwater concerns or hazardous material
utilized at this facility that may impact water quality, air
quality or groundwater? Contaminated groundwater already
exists at the site. Hazardous material stored at the site may
pose a threat to groundwater. Air Quality Permit for this
facility may be required by Mecklenburg County.
PART IV - EVALUATION AND RECOMMENDATIONS
NPDES Permit Staff Report
Version 10/92
Page 3

I
Colonial Pipeline Company is requesting an NPDES General
Permit for the discharge of treated groundwater resulting from
leaking tanks containing Gasoline.
The proposed method of treatment is typical of 'treatment
methods used by the petroleum industry for groundwater remediation
activities.
The treated wastewater discharged from the southern and the
northern plume is 'to enter two existing lagoons prior to
discharging into an unnamed tributary to Gum Branch.
Effluent from similar facilities have failed toxicity testing.
It is recommended that the NPDES Permit be issued once the
above mentioned concern regarding toxicity has been addressed.
gnat re of por� Preparer Date
4(
Water Quality RegX)6nal Supervisor ' Date
NPDES Permit Staff Report
Version 10/92
Page 4

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