NCG510431_Compliance Evaluation Inspection_20151028

North Carolina Department of Environmental Quality
Pat McCrory
Governor
October 28, 2015
Mr. Mike Ruffin, Manager
County of Davie
123 South Main Street
Mocksville, NC 27028
Subject: General Wastewater Permit Inspection
Davie Law Enforcement Center
Groundwater Remediation System
Certificate of Coverage No. NCG510431
Davie County
Dear Mr. Ruffin:
Donald R. van der Vaart
Secretary
On October 26, 2015, Mike Mickey of this office met with Gary Simcox of S&ME to perform
a General Wastewater Permit Inspection on the groundwater remediation system serving the Davie
Law Enforcement Center located at 140 South Main Street in Mocksville. The inspection findings
are detailed below and an inspection checklist is attached.
I. Permit
The Certificate of Coverage is for the remediation and discharge of groundwater that is
contaminated with diesel fuel. The permit expires next on September 30, 2016.
II. Records/Reports
Part I. A.(2) of the permit establishes monthly flow monitoring and quarterly analytical monitoring
of the discharge. A review of the sample data collected on 12/9/14, 3/19/15, 6/19/15 and 10/2/15 by
S&ME showed that all parameters were compliant with permit limits. Please note that there are no
standardized discharge monitoring forms that have to be submitted. Records must simply be
maintained for the facility for a period of three years.
III. Facility Site Review
No discharge was occurring at the time of the inspection due to routine maintenance being
performed on the system. The effluent discharged via two 2-inch PVC pipes into a downslope
ravine. One of the pipes was broken and needs to be replaced. The treated effluent eventually
reaches.a tributary to Leonard's Creek, class "C" waters in the Yadkin -Pee Dee River Basin. The
facility appeared to be competently operated and maintained.
450 West Hanes Mill Road, Suite 300, Winston-Salem, NC 27105
Phone: [phone] \ Internet: www.nedenr.gov
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October 28, 2015
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Your efforts to comply with the general wastewater permit are appreciated. Should you have
any questions regarding this letter, please contact Mike Mickey or me at [phone].
Sincerely,
Sherri V. Knight, PE
Assistant Regional Supervisor
Water Quality Regional Operations Section
Division of Water Resources
cc: Ed Henriques, III, L.G. ([e-mail])
WSRO

Permit: NGG510431 Owner -Facility: Law Enforcement Center
Inspection Date: 10/26/2015 Inspection Type: Compliance Evaluation
Permit
Yes No NA NE
(If the present permit expires in 6 months or less). Has the permittee submitted a new
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0
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application?
Is the facility as described in the permit?
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# Are there any special conditions for the permit?
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Is access to the plant site restricted to the general public?
0
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Is the inspector granted access to all areas for inspection?
0
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Comment: The groundwater remediation system for the diesel fuel contamination at the Davie Law
Enforcement Center consists of the following:
*Recovery wells (12).
*Oil/water separator.
*Free product storage tank.
*Shallow tray air stripper.
*Bag filters (2).
*Activated carbon vessels (2).
*Flow totalizer and effluent discharge pipe.
Flow Measurement - Effluent
Yes No NA NE
# Is flow meter used for reporting?
0
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Is flow meter calibrated annually?
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0
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Is the flow meter operational?
0
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(If units are separated) Does the chart recorder match the flow meter?
El
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M
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Comment: Flow is measured using an in -line totalizer located after the activated carbon vessels.
Readings are recorded at each site visit The average discharge
quantity for a 373 day
period was approx 2,100 GPD.
Effluent samples are collected from a spigot in the remediation building that follows the
activated carbon vessels The PH is measured on site and all other Parameters are sent off
for analysis A review of the quarterly sample data collected by S&ME on 1219114, 3/19/15,
6/19/15 and 10/2/15 showed the system to be compliant with permit limits.
Effluent Pipe
Yes No NA NE
Is right of way to the outfall properly maintained?
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0
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Are the receiving water free of foam other than trace amounts and other debris?
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0
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If effluent (diffuser pipes are required) are they operating properly?
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IN
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Comment: The effluent is discharged via two 2-inch PVC pipes into a ravine approximately
75 yards
downslope of the system One of the pipes was broken and needs to be replacaed. The
ravine forms the headwaters of Leonard Creek class "C" waters in the Yadkin -Pee Dee
River Basin.
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