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This document has been prepared in accordance with the Kerr Lake Regional Water System’s 2015 Interbasin Transfer Certificate.
Compliance and Monitoring Plan
Prepared for
Kerr Lake Regional Water System
February 2016
CH2M HILL, Inc.
3120 Highwoods Blvd, Ste 214
Raleigh, NC 27604
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This document has been prepared in accordance with the Kerr Lake Regional Water System’s 2015 Interbasin Transfer Certificate.
Contents
Section Page
Acronyms and Abbreviations
Introduction ........................................................................................................................................... 1
Interbasin Transfer Calculation .............................................................................................................. 2
2.1 Definitions ...................................................................................................................... 2
2.2 Data Compilation............................................................................................................ 4
2.3 Data Assumptions .......................................................................................................... 6
2.4 Metering ........................................................................................................................ 6
2.5 Interbasin Transfer Calculation ....................................................................................... 7
Reporting Methodologies and Schedules ............................................................................................... 8
3.1 Quarterly Reporting........................................................................................................ 8
3.2 Annual Reporting ........................................................................................................... 8
References ........................................................................................................................................... 10
Tables
1 Interbasin Transfer Annual Statistics – 2015 Example
2 KLRWS Wholesale Water Meters
3 KLRWS Interbasin Transfer Compliance Monitoring and Reporting
Figure
1 KLRWS Water Sales
KLRWS IBT COMPLIANCE AND MONITORING PLAN
Acronyms and Abbreviations
EA Environmental Assessment
FONSI Finding of No Significant Impact
I&I Inflow and infiltration
IBT Interbasin transfer
Kerr Lake John H. Kerr Reservoir
KLRWS Kerr Lake Regional Water System
LWSP Local Water Supply Plan
mgd million gallons per day
MMD average day of a maximum month
NCDEQ North Carolina Department of Environmental Quality
NCDWR North Carolina Division of Water Resources
NC EMC North Carolina Environmental Management Commission
SGWSA South Granville Water and Sewer Authority
WSRP Water Shortage Response Plan
WWTP Wastewater Treatment Plant
1
SECTION 1
Introduction
On November 5, 2015, the North Carolina Environmental Management Commission (EMC) granted an
interbasin transfer (IBT) certificate to the Kerr Lake Regional Water System (KLRWS). Permitted transfers
from the Roanoke River basin include: 10.7 mgd to the Tar River basin, 1.7 mgd to the Fishing Creek
basin, and 1.8 mgd to the Neuse River basin.
The owners of the KLRWS and primary bulk customers served by the system are the City of Henderson,
the City of Oxford, and Warren County, known as the “Partners.” Ownership responsibility is 60 percent,
20 percent, and 20 percent, respectively. They also currently sell water to secondary bulk customers
including Stovall, Warrenton, Norlina, Vance County, Kittrell, and Franklin County. Future sales will occur
from Oxford to South Granville Water and Sewer Authority (SGWSA) for use in Creedmoor’s service
area. Franklin County owns the Youngsville water system and also sells water to Bunn and Lake Royale.
Water sales are shown in Figure 1.
In addition to the permitted transfer, the IBT certificate includes seven conditions (NC EMC, 2015):
1. Water Conservation Plan – Within 90 days of receipt of the IBT certificate, the KLRWS is required to
submit a water conservation plan subject to approval by the North Carolina Division of Water
Resources (NCDWR) that specifies the water conservation measures that will be implemented by the
KLRWS, its Partners and its wholesale customers to ensure the efficient use of the transferred water.
2. Drought Management Plan – Within 90 days of receipt of the IBT certificate, the KLRWS is required
to submit a drought management plan subject to approval by the NCDWR that specifies how the
transfer will be managed to protect the source river basin (Roanoke River basin) during drought
conditions or other water emergencies that occur within the source river basin.
3. Compliance and Monitoring Plan – Within 90 days of receipt of the IBT certificate, the KLRWS is
required to submit a quarterly compliance and monitoring plan subject to approval by the NCDWR.
4. EMC Consideration of Alternative Sources – The EMC may reopen and amend the maximum
amount of the IBT authorized if it appears that an alternative source of water is available to the
Partners of the KLRWS within the receiving basin (Tar River basin, Neuse River basin, and Fishing
Creek basin).
5. EMC Consideration of Future Water Demands – The EMC may reopen and amend the certificate if it
is determined that the Partners’ actual future water needs are significantly less than the projected
water needs at the time the certificate was granted.
6. Resale of Transferred Water – The Partners shall not resell the water that would be transferred
pursuant to the IBT certificate to another public water system not listed in the certificate.
7. EMC Consideration of Impacts – The EMC may reopen the certificate and amend existing or require
new conditions to ensure detrimental impacts are mitigated if environmental impacts are found to
be substantially different from those on which the EMC’s Findings of Fact were based.
To meet Condition 3, the following sections of this Compliance and Monitoring Plan include a
description of how the KLRWS and its Partners will monitor the amount of IBT, and also as required by
the certificate, methodologies, and schedules for reporting the following information:
Monthly average day transfer amounts (calculated)
Compliance with IBT certificate conditions
Reporting – both quarterly and with an annual report
2
SECTION 2
Interbasin Transfer Calculation
The combined transfer from the Roanoke River basin and the amount of transfer to each river basin will
be calculated on a daily basis and presented as average values for each calendar month. The
methodology for calculating the daily IBT amount is consistent with NCDWR guidelines for estimating
IBT amounts as part of the local water supply planning process (NCDWR, 2009).
The KLRWS is a complex network of water systems and, to calculate IBT, tracking of sales to other
parties and wastewater discharges is necessary. Water is transferred (and not returned to the Roanoke
River basin) via potable water consumptive use and wastewater discharge. Daily IBT is calculated based
on a combination of sales data and assumptions including the percentage of each customer’s service
area in each river basin as reported in Local Water Supply Plans (LWSPs). Daily IBT data are then used to
calculate the IBT certificate compliance metric – IBT calculated as the daily average of a calendar month.
2.1 Definitions
The following definitions are used to assign collected water system data and conduct calculations for IBT
compliance and monitoring, as shown in Table 1.
Water Withdrawal is the total volume of water pumped from Kerr Lake by Henderson, Oxford, and
Warren County in the Roanoke River basin.
Return to the Roanoke River basin includes:
- The amount of water discharged by the KLRWS water treatment plant (WTP) back to Kerr Lake
as a result of the treatment process
- The amount of treated wastewater discharged back to the Roanoke River basin via the City of
Henderson’s wastewater treatment plant
Interbasin Transfer is calculated as the withdrawal from the source basin (Roanoke River Basin)
minus the return to the source basin. IBT is then calculated for each of the three receiving basins
(Tar River basin, Neuse River basin and Fishing Creek basin). Components of this calculation include:
- Sales: The amount of water sold to each Partner and each wholesale customer, as metered at
the point of sale.
- Consumptive Use: The water used by customers that does not end up in the wastewater
collection system; septic systems and irrigation are the most common consumptive uses.
- Water Use Discharged as Wastewater: The non-consumptive water use discharged as
wastewater in each basin, based on effluent flow meter data. The following utilities discharge in
each basin:
- Roanoke River Basin
Henderson
Stovall
- Tar River Basin
Franklin County
Bunn
Lake Royale
Oxford
3
Granville County
- Fishing Creek Basin
Warren County
Warrenton
Norlina
- Neuse River Basin
SGWSA (for Creedmoor)
4
Table 1
Interbasin Transfer Annual Statistics - 2015 Example
Date Withdrawal Return to Interbasin Transfer to Total IBT
Month Year Roanoke Roanoke Tar Fishing Creek Neuse
MAXIMUM 2015 10.7 1.7 1.8 14.2
January
February
March
April
May
June
July
August
September
October
November 2015 6.1 1.7 3.5 0.8 0.1 4.4
December 2015 5.8 1.2 3.8 0.7 0.1 4.6
Maximum Month
Average Day
2015 1.2 3.8 0.7 0.1 4.6
5
2.2 Data Compilation
Metered data are used to calculate IBT. The following data are collected and input into the KLRWS’ IBT
tracking spreadsheet:
- Water Withdrawal, comprising:
- Kerr Lake withdrawal from the Roanoke River basin
- Water Sales to the Partners and their Wholesale Customers
Henderson sells to:
Kittrell
Vance County
Franklin County. Franklin County sells to:
Bunn
Lake Royale
Oxford sells to:
Stovall
Granville County
SGWSA (future, for Creedmoor)
Warren County sells to:
Warrenton
Norlina
- Water Use Discharged as Wastewater, including:
Henderson discharges to Roanoke
Kittrell discharges to the Tar River basin
Franklin County discharges to the Tar River basin
Bunn discharges to the Tar River basin
Lake Royale discharges to the Tar River basin
Oxford discharges to the Tar River basin
Stovall discharges to the Roanoke River basin
Granville County discharges to the Tar River basin
SGWSA (Creedmoor) discharges to the Tar River basin
Warren County discharges to the Fishing Creek subbasin
Warrenton discharges to the Fishing Creek subbasin
Norlina discharges to the Fishing Creek subbasin
- Consumptive Use
Consumptive use in Henderson occurs in both the Roanoke and Tar River basins
Consumptive use in Kittrell is wholly in the Tar River basin
Consumptive use in Vance County occurs in both the Roanoke and Tar River basins
Consumptive use in Franklin County occurs in both the Tar and Neuse River basins
Consumptive use in Bunn occurs wholly in the Tar River basin
Consumptive use in Lake Royale occurs wholly in the Tar River basin
Consumptive use in Oxford occurs wholly in the Tar River basin
Consumptive use in Stovall occurs wholly in the Roanoke River basin
Consumptive use in Granville County occurs in both the Roanoke and Tar River basins
Consumptive use in SGWSA is wholly in the Neuse River basin
Consumptive use in Warren County occurs in both the Roanoke River Basin and the Fishing
Creek subbasin
Consumptive use in Warrenton is wholly in the Fishing Creek subbasin
6
Consumptive use in Norlina occurs in both the Fishing Creek subbasin and the Roanoke River
Basin
2.3 Data Assumptions
The calculation of IBT is essentially similar to performing a water balance – estimating how much of the
water withdrawn from the source basin ends up in each IBT basin as either treated wastewater
discharge or consumptive use. The following assumptions are used to estimate consumptive use and to
account for factors such as wastewater system infiltration and inflow (I/I):
The percentages of consumptive use that occurs in the source basin and each IBT receiving basin are
estimated based on the percentage of each service area in each IBT basin as reported in LWSPs and
the difference between total water use and wastewater discharge.
When wastewater discharge is greater than water used (including consumptive use), it is likely the
result of wastewater system I/I during very rainy periods. In these instances, the proportion of water
use discharged as wastewater in each IBT basin is assumed to be the same as the proportion of
measured wastewater discharged in each basin.
2.4 Metering
Some KLRWS wholesale customers are very small utilities with limited resources. As such, meters that
track sales from the Partners and Franklin County may need to be read manually and are not currently
being read daily. Instead, some meters are read monthly. The average day of a calendar month value,
per the meter, will be used in data compilation for the IBT calculation. Should reporting issues arise with
any of the monthly readings, the individual water provider will work with both the KLRWS and NCDWR
to resolve and remedy those issues from reoccurring. This may include switching to daily readings, as
deemed appropriate. Table 2 lists each wholesale customer meter and the frequency with which it is
read by the water provider.
Table 2
KLRWS Wholesale Water Meters
Partner Customer Meter
City of Henderson Franklin County daily
Bunn monthly
Lake Royale monthly
Vance County monthly
Kittrell monthly
City of Oxford Stovall monthly
SGWSA (future)
Granville County monthly
Warren County Warrenton monthly
Norlina daily
7
2.5 Interbasin Transfer Calculation
Generally, the sequence of the daily IBT calculations is as follows:
1. Calculate consumptive use as the difference between total water use and wastewater discharges:
a. Calculate the difference for each entity.
b. Calculate consumptive use by basin by using service area statistics from LWSPs.
2. Distribute consumptive use and water use discharged as wastewater by IBT basin: Tar and Neuse
River basins and Fishing Creek Subbasin.
3. Calculate the total returned and used in each basin, calculated as the total amount of consumptive
use and water use discharged as wastewater within the Roanoke, Tar, and Neuse River basins and
the Fishing Creek subbasin.
4. Determine IBT from the Roanoke River basin to the Tar and Neuse River basins and Fishing Creek
subbasin based on metered wastewater discharge and calculated consumptive use data.
The average day IBT values will be calculated for each month in a calendar year from the daily IBT values
developed following the calculation steps outlined herein.
8
SECTION 3
Reporting Methodologies and Schedules
Compliance with the permitted IBT limits from the Roanoke River basin to the Neuse River basin, from
the Roanoke River basin to the Tar River basin, and from the Roanoke River basin to the Fishing Creek
subbasin, is required in the IBT certificate to be reported quarterly. The status of the additional seven
conditions that the Partners must meet in order to maintain compliance with the IBT certificate will be
reported annually.
3.1 Quarterly Reporting
At the end of each quarter, the Partners will calculate the daily average IBT amount for each month in
the quarter and submit a brief fact sheet to NCDWR within 30 days after the end of the quarter. The
KLRWS will also post this information on its website (http://ci.henderson.nc.us/departments/public-
utilties/kerr-lake-regional-water-system/).
The schedule for quarterly reporting is as follows:
Quarter 1 (Q1) – report due by April 30 (Q1 includes January, February, and March)
Quarter 2 (Q2) – report due by July 30 (Q2 includes April, May, and June)
Quarter 3 (Q3) – report due by October 30 (Q3 includes July, August, and September)
Quarter 4 (Q4) – report due by January 30 (Q4 includes October, November, and December)
3.2 Annual Reporting
By April 1 of the following year, the Partners will submit an Annual IBT Report to NCDWR with the
following information:
1. Summary of historical water withdrawals, wastewater discharges, and IBT, beginning with the 2015
award date of this IBT certificate for the 2015 Annual Report and reported for the January to
December calendar year thereafter.
2. Table and graph of calculated daily average of a calendar month IBT amounts for the reporting year.
3. Status of compliance with IBT certificate limits and conditions as listed in Table 3.
9
Table 3
KLRWS Interbasin Transfer Compliance Monitoring and Reporting
Item Description a Comments
IBT Limits
(from the
Roanoke
River Basin)
Daily average of a calendar
month:
- 10.7 mgd to Tar
- 1.7 mgd to Fishing Creek
- 1.8 mgd to Neuse
- 14.2 mgd total
Daily IBT is calculated. The average day of the maximum month IBT is
thenreported in the Annual IBT Report.
IBT calculated as the daily average of a calendar month reported on the
KLRWS website quarterly and in the Annual IBT Report.
The percentages of water use in each basin, summarized historically,
and set for calculating daily IBT for the next year will be reported in the
Annual IBT Report.
Condition 1 Water Conservation Plan
Initial submittal to NCDWR by February 7, 2016, and then revised as
needed to obtain NCDWR approval.
Water Conservation Plan will always be available on the KLRWS
website.
Status of the plan will be included in the Annual IBT Report.
Condition 2 Drought Management Plan
Initial submittal to NCDWR by February 7, 2016, and then revised as
needed to obtain NCDWR approval. Updates will be provided to
NCDWR as needed.
Drought Management Plan will always be available on the KLRWS
website.
Status of the plan will be included in the Annual IBT Report.
Condition 3 Compliance and Monitoring
Plan
Initial submittal to NCDWR by February 7, 2016, and then revised as
needed to obtain NCDWR approval.
Compliance and Monitoring Plan will always be available on the KLRWS
website.
The Annual IBT Report will always be available on the KLRWS website.
Status of the plan will be included in the Annual IBT Report.
Condition 4 EMC Consideration of
Alternative Sources No reporting necessary.
Condition 5 EMC Consideration of Future
Water Demands No reporting necessary.
Condition 6 Resale of Transferred Water Included in the Annual IBT Report.
Condition 7 EMC Consideration of Impacts No reporting necessary.
a Certificate conditions are described in Section 1.
10
SECTION 4
References
North Carolina Division of Water Resources (NCDWR). 2009. Regulation of Surface Water Transfers
Statutory Guidance. http://www.ncwater.org/files/IBT_guidance_v1.pdf. Accessed April 10, 2015.
North Carolina Environmental Management Commission (NC EMC). 2015. Certificate Authorizing the
Interbasin Transfer from the Roanoke River basin by the Kerr Lake Regional Water System.
http://www.ncwater.org/?page=294.
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Raleigh
Durham
Rocky Mount
Red Oak
Butner
Chapel Hill
Cary
Tarboro
Dortches
Henderson
Cary
Wake Forest
Durham
Morrisville
Roxboro
Carrboro
Oxford
Roanoke Rapids
Nashville
Zebulon
Creedmoor
Rolesville
Weldon
Louisburg
Gaston
Hillsborough
Enfield
Stovall
Stem
Youngsville
Franklinton
Norlina
Princeville
Momeyer
Littleton
Spring Hope
Elm City
Bunn
Leggett
Castalia
Warrenton
Garysburg
Wake Forest
Whitakers
Sharpsburg
Hillsborough
Macon
Middleburg
Knightdale
Zebulon
Halifax
Seaboard
Knightdale Wendell
Kittrell
Creedmoor
Zebulon
Centerville
Conetoe
Rolesville
Elm City
Weldon
Pinetops
Elm City
WendellKnightdale Elm CityWilson
NASH
HALIFAX
WAKE
PERSON
DURHAM
EDGECOMBE
ORANGE
NORTHAMPTON
CHATHAM
WILSON PITTJOHNSTON
¯5 0 52.5 Miles
Roanoke Rapids Lake
Figure 1KLRWS Water SalesInterbasin Transfer from Roanoke River BasinIBT Compliance and Monitoring Plan
LakeGaston
KerrLakeMayoReservoir
Lake Hyco
Louisburg
HendersonOxford
Youngsville
Creedmoor
LakeRoyale
FallsLake
WARREN
VANCE
GRANVILLE
FRANKLIN
§¨¦40
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Legend Interstate Highway
Water Body
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Water Customers
River Basins
Major Road
County Border
Municipalities
Major Hydrography
WWTP Discharge#*
Fishing Creek (15-2)
Contentnea (10-2)
Neuse (10-1)
Tar (15-1)
Roanoke (14-1)
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