WQ0003781_Correction_20010622

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross Jr., Secretary
Kerr T. Stevens, Director
Tune 22, 2001
MR. RONALD D. ELKS, DIRECTOR OF WATER RESOURCES
GREENvu.,LE UTILITIES COMMISSION
POST OFFICE Box 1847
GREENviLLE, NORTH CAROLINA 27835-1847
Dear Mr. Elks:
4 •
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RE50URCES
Subject: Permit No. WQ0003781 Correction
and Guidance
Greenville Utilities Commission
Land Application of Residuals
from the Treatment of Wastewater
Pitt County
In accordance with a telephone request received on June 14, 2001 from Mr. Barrett
Lassiter with the Greenville Utilities Commission, we are forwarding herewith a corrected Page
9, Page 11, and Figure No. 1 of Permit No. WQ0003781, issued May 14, 2001, for the subject
residuals land application program.
The following corrections have been made to the permit:
1. Condition IV. 1. of the permit requires the installation of an additional groundwater
monitoring well (i.e., MW-10) near one of the existing groundwater monitoring wells
(i.e., MW-3). The Division of Water Quality (Division) required this action because
MW-1, MW-3, and MW-6 were constructed such that the well screens are too deep
and may not be monitoring the groundwater in a way that is truly representative of the
groundwater quality.
Upon a site visit by the Groundwater Section of the Division's Washington Regional
Office, it was determined that a location near MW-3 would not be advantageous
because of its proximity to a large drainage canal, which may act as a hydraulic
barrier that would prevent contaminant transport, and the fact that the closest land
application sites (i.e., Site No. 3 and Site No. 4) are used infrequently for residuals
land application. Therefore, Condition IV. 1. has been amended to require MW-10 be
located approximately 10 to 15 feet away from MW-6 and at the review boundary-
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] Fax [phone]
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2. Condition IV. S. has been amended to correct a typographical error in which Site No.
10 was mistakenly identified as being seasonally -restricted for the purpose of
residuals land application. Site No. 12 is, in fact, the land application site that is
required by the Division to be seasonally -restricted in that residuals land application
may only occur during the months of April through November, inclusive, as long as
the seasonal high water table is verified to be more than three feet below the land
surface.
3. Figure No. 1 has been amended to depict the new recommended location of MW-10,
as stipulated in the corrected Condition IV. 1. Specifically, MW-10 is to be located
near MW-6 and not MW-3.
Please replace Page 9, Page 11, and Figure No. 1 with the corrected Page 9, Page 11,
and Figure No. 1 into Permit No. WQ0003781, issued May 14, 2001.
In addition to the above corrections, the Division would Iike to document the following
guidance provided by the Division regarding this permit to the Permittee. These are issues that
have been discussed between Mr. Lassiter and Ms. Shannon Mohr Thornburg of the Division's
Non -Discharge Permitting Unit since this permit's issuance.
1. One of the requirements of this permit is that the Permittee perform an agronomic
study throughout the duration of the permit cycle in order to determine the most
appropriate plant available nitrogen (PAN) rate to allow for complete assimilation of
the PAN present in the residuals without contamination of surface water and
broundwater resources. The Permittee had initially hoped to gather data from three
full growing cycles of the Coastal Bermuda/Winter Rye cover crops for the
Division's review. However, due to the time and complexity of initiating the study, it
is believed that the first Coastal Bermuda crop may have been compromised such that
the resultant data may not be representative of the true assimilative capacity of the
crop. Data will still be collected during this first Coastal Bermuda cropping cycle,
but the Division has agreed to allow the data to be omitted from developing the
study's final recommendations should they prove to be statistically different from that
collected from the second and third Coastal Bermuda cropping cycles investigated
during this study.
2. Condition 1II. 7. provides some guidance as to how the residuals should be tested
prior to their land application. This condition requires that the Permittee test/monitor
each batch of residuals for compliance with the pathogen reduction and vector
attraction reduction requirements in 40 CFR Part 503. Specifically, in this case,
seven samples must be withdrawn from each batch of residuals and be tested for fecal
coliform density such that the geometric mean of the sample results is shown to be
less than 2 x 106 most probable number per gram of total dry solids of 2 x 106
coliform forming units per gram of total dry solids to prove compliance with the
pathogen reduction requirements. In order to demonstrate compliance with the vector
attraction reduction requirements, at least one specific oxygen uptake rate (SOUR)
test must be performed on each batch of the residuals to show that the SOUR of the
residuals is equal to or less than 1.5 milligrams of oxygen per hour per gram of total
dry solids at 20 degrees Celsius.
2

3. Condition IV. 9. requires that the Permittee verify the depth of the seasonal high
water table (i.e., must be greater than three feet below the land surface) prior to land
applying residuals. This verification may be completed by reading water level
readings in the groundwater monitoring wells within the 24 hours prior to the land
application event. Note, however, that the water levels in all of the wells in the
Permittee's groundwater monitoring program do not need to be read for the purpose
of this verification. Rather only that well(s) nearest to the site to which residuals are
to be land applied need to be read in order to comply with this condition.
If you need any additional information concerning this matter, please contact Ms.
.Thomburgat [phone], extension 353.
Sinc y,
, err T. Stevens
cc: Pitt County Health Department
Washington Regional Office, Water Quality Section
Washington Regional Office, Groundwater Section
Central Office, Groundwater Section
Technical Assistance and Certification Unit
Non -Discharge Compliance/Enforcement Unit
Permit File WQ000378I

IV. GROUNDWATER REQUIREMENTS
Within 90 days of this permit's issuance, an additional groundwater monitoring; well, approximately
10 to 15 feet from MW-6 and designated as MW-10, shall be installed to monitor groundwater
quality. The well shall be constructed such that the water Ievel in the well is never above or below
the screened (i.e., open) portion of the well at any time during the year. The general location and
name for this well is marked on Figure 1 of this permit. The groundwater monitoring well shall be
constructed in a location at the Review Boundary, in accordance with this permit, and approved by
the Groundwater Section of the Washington Regional Office.
2. All wells that are constructed for the purpose of groundwater monitoring shall be constructed in
accordance with 15A NCAC 2C .0108 (i.e., "Standards of Construction for Wells Other than Water
Supply") and any other state and local laws and regulations pertaining to well construction.
The Washington Regional Office, telephone number [phone], shall be notified at least 48
hours prior to the construction of any groundwater monitoring well, so that an inspection can be
made of the well location. Such notification shall be made to the Regional Groundwater Supervisor
during normal office hours (i.e., from 8:00 a.m. until 5:00 p.m.) on Monday through Friday,
excluding State Holidays.
4. Within 30 days of completion of all well construction activities, a certification shall be received
from a North Carolina -licensed Professional Engineer or North Carolina -licensed Professional
Geologist certifying that the groundwater monitoring wells are located and constructed in
accordance with 15A NCAC 2C (i.e., "Well Construction Standards") and this permit. This
certification shall be submitted with one copy of a GW-1 Form (i.e., "Well Completion Form") for
each well. Mail this certification and the associated GW-1 Forms to NCDENR-DWQ, Groundwater
Section, Permits and Compliance Unit, 1636 Mail Service Center, Raleigh, NC 27699-1636.
Within 60 days of groundwater monitoring well installation, the Permittee shall submit two original
copies of a scaled topographic map (i.e., with a scale no greater than one inch equals 100 feet) that
has been signed and sealed by a North Carolina -licensed Professional Engineer or a North Carolina -
licensed Land Surveyor and contains all of the following information:
a. Location of all property boundaries,
b. Location of the waste disposal system,
c. Location of the review and compliance boundaries,
d. Location and identity of each groundwater monitoring well,
e. Location of all supply wells within the property boundaries and within a 500-foot radius of the
waste disposal system;
f Latitude and longitude of the established horizontal control monument,
g. Relative elevation of the top of the casing for each groundwater monitoring well (i.e., known as
the measuring point"), and
h. Depth of water below the measuring point at the time the measuring point is established.

If any VOCs are detected by the methods listed, then the Washington Regional Office Groundwater
Supervisor, telephone number [phone], shall be contacted immediately for further
instructions regarding any additional follow-up analyses required. The results of all initial and
follow-up analyses shall be submitted simultaneously.
If total organic carbon concentrations greater than 10 milligrams per liter are detected in any
downgradient monitoring well, additional sampling and analysis shall be conducted to identify the
individual constituents comprising this total organic carbon concentration. If the total organic
carbon concentration as measured in the background groundwater monitoring well exceeds 10
milligrams per liter, the concentration shall be taken to represent the naturally -occurring total
organic carbon concentration. Any exceedances of this naturally -occurring total organic carbon
concentration in the downgradient wells shall be subject to the additional sampling and analysis as
described above.
The measurement of water levels shall be made prior to sampling the groundwater for the remaining
parameters. The depth to water in each monitoring well shall be measured from the surveyed point
on the top of the casing.
The results of the sampling and analysis shall be received on the GW-59 Form on or before the last
working day of the month following the sampling month at the following address:
NCDENR-DWQ
Groundwater Section
Permits and Compliance Unit
1636 Mail Service Center
Raleigh, North Carolina 27699-1636
8. Site No. 12 is dominated by soils having a mean seasonal high water table at 2.5 feet below the land
surface. Therefore, the application of residuals on this land application site shall be prohibited from
December through March, inclusive. Residuals land application may be performed throughout the
remainder of the year (i.e., April through November, inclusive} provided that the three-foot
separation condition described in Condition 1V. 9. is met. All other land application sites listed in
Condition VI. 4. are dominated by soils with a mean seasonal high water table that is greater than
three feet below the land surface and are, therefore, approved for year-round residuals land
application.
9. No residuals shall be applied to any land application site when the vertical separation between the
depth of residuals application and the water table is less than three feet. Verification of the water
table elevation can be confirmed by water level readings obtained from the groundwater monitoring
wells near the site, within 24 hours prior to the land application event_
10. The COMPLIANCE BOUNDARY for disposal systems shall be specified by regulations in 15A
NCAC 2L (i.e., Groundwater Classifications and Standards). The Compliance Boundary for
residuals land application programs initiated after December 31, 1983 shall be established at either
(1) 250 feet from the land application area, or (2) 50 feet within the property boundary, whichever is
closest to the land application area. An exceedance of groundwater quality standards at or beyond
the Compliance Boundary shall be subject to immediate remediation action in addition to the
penalty provisions applicable under North Carolina General Statute § 143-215.6A(a)(1).
In accordance with 15A NCAC 2L, a REVIEW BOUNDARY shall be established around the land
application area midway between the Compliance Boundary and the perimeter of the land
application area. Any exceedance of standards at the Review Boundary shall require remediation
action on the part of the Permittee.
11. Any additional groundwater quality monitoring, as deemed necessary by the Division, shall be
provided.

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