NC0039420_Permit Modification_19970421

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E.., Director
Mr. Earl T. Robb
1401 East Broad Street
Richmond, North Carolina 23219
Dear Mr. Robb:
4
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April 21, 1997
Subject: Modification to NPDES Pemait
Permit No. NCO039420
Virginia DOT 1-77 Rest Area
Surry County
On June 30, 1994, the Division of Water Quality issued NPDES Permit No. NCO039420
to Virginia Department of Transportation. Based on a review of this permit file by the Aquatic
Survey'and Toxicology Unit, the Division is hereby forwarding the following modification to the
subject permit. This permit modification is to remove the toxicity testing requirement from the
effluent limitations page and Special Condition Part IH E (chronic toxicity). Please insert the
enclosed effluent limitations page and discard the old effluent limitations page. This permit
modification becomes effective immediately.
All other terms and conditions in the original permit remain unchanged and 'in full effect.
These modifications are issued pursuant to the requirements of North Carolina General Statute
143-215.1 and the Memorandum of Agreement between North Carolina and the U. S.
Environmental Protection Agency dated December 6, 1983.
If any parts, measurement frequencies or sampling requirements contained in this permit
are unacceptable to you, you have the right to, an adjudicatory hearing upon written request within
thirty (30) days following receipt of this letter. This request must be in the form of a written
petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the�'
Office of Administrative Hearings, Post Office Drawer 11666, Raleigh, North Carolina 27604.
Unless such demand is made, this decision shall be final and binding.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX[phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post-consumerpaper

Mr. Earl T. Robb
Page Two
April 21, 1997
If you have any questions concerning this permit, please contact Mr. Mack Wiggins at
telephone number 919/733-5083, ext. 542.
Sincerely,
Preston Howard r., P.E.
cc: Central Files
Winston-Salem Regional Office/WQ Section
Permits and Engineering Unit
Facility Assessment Unit
Aquatic Survey and Toxicology Unit

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NCO039420
During the period beginning on the effective date of the permit and lasting until expiration, the Permittee is authorized to discharge from
outfall(s) serial number 001. Such discharges shall be limited and monitored by the pen-nittee as specified below:
Effluent Characteristics
Flow
BOD, 5 day, 200C
Total Suspended Residue
NH3 as N**
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Conductivity
Discharge Limitations
Monitoring
Requirements
Measurement
Sample
jaA m_p I e
Monthly Avg. Weekly AM
Daily Max
Freguency
Type
Location
0.02 MGD
Continuous
Recorder
I or E
30.0 mg1l
45.0 mg1l
Weekly
Grab
E
30.0 mg/l
45.0 mg/l
Weekly
Grab
E
2/Month
Grab
E
200.0/100 ml
400.0 /100 ml
Weekly
Grab
E,U,D
Daily
Grab
E
Weekly
Grab
E,U,D
Weekly
Grab
U, D
* Sample locations: E - Effluent, I - Influent, U - Upstream approximately 100 feet above discharge, D - Downstream approximately 300 feet
below discharge
NH3 as N limits of 6.0 mg/l monthly average in summer (April 1 - October 3 1) and 22.0 mg/1 monthly average in winter (November 1 -
March 3 1) shall become effective on May 1, 1996.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored 2/month at the effluent by grab
sample.
There shall be no discharge of floating solids or visible foarn in other than trace amounts.