2011 IBT Annual Report final

2011 ANNUAL REPORT on INTERBASIN TRANSFERS
for
RTP South and the Towns of Cary, Apex, and Morrisville

Prepared for:
Town of Apex
Town of Cary
Town of Morrisville
RTP South/Wake County

Submitted to:
North Carolina Division of Water Resources

April 2012

Prepared by:
Sydney Paul Miller
Water Resources Engineer
Town of Cary
PO Box 8005
Cary, NC 27512-8005
919-462-2066
[e-mail]

2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville

Table of Contents
Executive Summary ........................................................................................................... ES-2
1. Jordan Lake Allocation Monitoring ...................................................................... 1-1
2. IBT Monitoring ........................................................................................................ 2-1
3. Compliance with Certificate Conditions .............................................................. 3-1

Appendix A: Daily Tracking of Combined Jordan Lake Water Supply Allocations for
2011 ............................................................................................................... A-1
Appendix B: Daily Interbasin Transfer Estimates for 2011............................................ B-1
Appendix C: Water Shortage Response Plans Updated for 2011………………… ..... ...C-1

2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
ES-2
Executive Summary
The 2011 Annual Report on Interbasin Transfers for RTP South and the Towns of Cary, Apex,
and Morrisville includes monitoring data for daily tracking of IBT amounts and combined
Jordan Lake allocations held by the certificate holders.
The Town of Cary and Morrisville merged their utility systems on April 3, 2006. Cary is
responsible for providing billing and system maintenance for water and sewer services to
Morrisville and RTP South customers. Morrisville and Wake County RTP South, continue to
hold independent Jordan Lake water supply allocations.
In 2011, the certificate holders complied with all conditions of the IBT certificate. The maximum
daily IBT amount for Cary, Apex, Morrisville, and RTP South was 21.7 million gallons per day
(mgd). Maximum day IBT amounts and a summary of Jordan Lake withdrawals are provided in
Table ES-1. The daily IBT amounts in 2011 for Cary, Apex, Morrisville, and RTP South are
shown in Figure ES-1. The required average annual return of reclaimed water to the Cape Fear
or Haw basin was 0.0 mgd and the actual average reclaimed water return was 2.0 mgd (see
Table ES-2). The annual average IBT amount was 14.1 mgd.
Table ES-1
Summary of Interbasin Transfers for Cary, Apex, Morrisville and RTP South
Withdrawal from Haw
Subbasin (mgd)1
Total Return to Haw
Subbasin (mgd) 4
Interbasin Transfer
(mgd)
IBT as % of
Certificate
Calendar Year Average
Annual
Max. Day Average
Annual
Max. Day Average
Annual
Max.
Day
Max.
1998 10.8 15.7 1.7 3.5 9.0 14.3 90%
1999 9.2 15.6 1.6 4.2 7.6 12.9 81%
2000 7.3 14.2 1.1 4.4 6.2 11.8 74%
20012 9.7 18.8 2.8 9.4 6.8 15.0 63%3
2002 16.9 29.2 3.5 10.3 13.5 22.5 94%
2003 15.9 22.7 2.5 5.5 13.4 17.8 74%
2004 17.0 25.5 2.8 6.1 14.2 22.6 94%
2005 18.4 26.1 3.8 8.1 14.5 19.6 82%
2006 17.6 25.9 3.3 6.6 14.3 20.8 87%
2007 19.8 30.8 3.8 7.7 15.9 23.5 98%
2008 18.9 28.3 4.6 9.1 14.1 20.9 87%
2009 19.5 28.0 5.5 11.3 14.0 20.4 85%
2010 20.9 33.1 6.5 12.1 14.4 22.3 93%
2011 20.0 33.6 5.9 14.3 14.1 21.7 90%
1. Includes water use by Cary, Apex, Morrisville, and RTP South.
2. Withdrawals in 2001 were unusually high due to construction activities at the Cary/Apex WTP and do not reflect actual
potable water demands.
3. Permitted IBT amount increased from 16 mgd to 24 mgd in July 2001. The maximum day IBT of 15.0 mgd occurred
after the permitted amount increased to 24 mgd.
4. Includes consumptive use.
2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
ES-3

0.00
5.00
10.00
15.00
20.00
1/1 2/1 3/1 4/1 5/1 6/1 7/1 8/1 9/1 10/1 11/1 12/1
In
t
e
r
b
a
s
i
n

T
r
a
n
s
f
e
r

(
m
g
d
)
Figure ES-1: Daily Interbasin Transfer for Cary, Apex, Morrisville and RTP South
[Haw Sub-Basin to Neuse Sub-Basin]
Cary Apex Morrisville RTP

Table ES-2
Summary of Compliance with IBT Certificate Condition No. 1
Year Neuse
Finished
Water
from the
Haw
(mgd)
Peaking
Factor
16 mgd
MDD
adjusted
to ADD
Consumptive
Use Factor
(%)
Neuse
Consumptive
Use (from
the Haw)
(mgd)
Required
Return
(mgd)
Amount
Returned
(mgd)
(a) (b) (c)=16/(b) (d) (e)=(a)*(d) (f)=(a)-
(c)-(e)
(g)
2011 12.0 1.64 9.76 20% 2.4 0.0 2.0
a = Average annual transfer from Haw to Neuse (see Table B-1)
b = Peaking factor specified in Certificate for first year, and to be approved by DWR thereafter
d = Percent consumptive use specified in Certificate for first year and to be approved by DWR thereafter
g = Average annual wastewater discharges and water reuse in Haw and Cape Fear Basins (see Table B-1)

2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
1-1
1.0 Jordan Lake Allocation Monitoring
The combined Jordan Lake water supply allocation for Cary, Apex, Morrisville, and RTP
South can be tracked on a daily basis. Daily tracking of the combined Jordan Lake allocation
for the period January 1, 2011 through December 31, 2011 is included in Appendix A. The
water supply pools for each allocation holder were full on January 1, 2011.
The Town of Cary and the Town of Morrisville merged their utility systems on April 3, 2006,
and subsequently the Town of Cary began providing billing, facilities, and system
maintenance for water and sewer services to Morrisville customers. Morrisville continues to
hold their Jordan Lake water supply allocation. For purposes of reporting on Jordan Lake
allocations and IBT, Cary and Morrisville measurements will continue to be reported
separately.
For 2011, the maximum day withdrawal for all certificate holders was 33.6 mgd, which
occurred on June 7th. The average daily withdrawal for all certificate holders was 20.0 mgd
during 2011 (Table 1-1).
Table 1-1
Summary of Jordan Lake Withdrawals1
Year Average Annual Withdrawal
(mgd)
Maximum Daily Withdrawal
(mgd)
19982 10.8 15.7
19992 9.2 15.6
2000 7.3 14.2
2001 9.7 18.8
2002 16.9 29.2
2003 15.9 22.7
2004 17.0 25.5
2005 18.4 26.1
2006 17.6 25.9
2007 19.8 30.8
2008 18.7 28.3
2009 19.5 28.0
2010 20.9 33.1
2011 20.0 33.6
1. Withdrawals from Jordan Lake at the Cary/Apex raw water intake. Includes water use by Apex, Cary,
Morrisville and RTP South. Does not include water use by Durham.
2. Includes water use by Holly Springs from 1/1/98 to 6/30/99

2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
1-2

Table 1-2 presents historical water use for the certificate holders (Cary, Apex, Morrisville,
and RTP South) based on finished water produced at the Cary/Apex WTP plus purchases.
In 2011, finished water demands averaged 17.2 mgd and the maximum day demand was
27.6 mgd. The maximum day peaking factor was 1.60 in 2011.
Table 1-2
Summary of Finished Water Demands
Year Average Annual Demand
(mgd)
Maximum Daily Demand
(mgd)
Maximum Day/Average Day
Peaking Factor
19982 12.2 20.1 1.65
19992 12.6 21.5 1.71
2000 13.0 21.6 1.66
2001 14.2 22.0 1.55
2002 14.9 25.6 1.72
2003 13.9 19.9 1.43
2004 14.8 25.8 1.74
2005 15.6 22.6 1.45
2006 15.7 24.0 1.53
2007 17.9 28.1 1.57
2008 16.1 25.9 1.61
2009 16.1 24.6 1.53
2010 17.1 27.8 1.63
2011 17.2 27.6 1.60
1. Includes finished water delivered to the distribution system by the Cary/Apex WTP.
2. Includes water use by Holly Springs from 1/1/98 to 6/30/99.

2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
1-3
Water use for Morrisville and RTP South is not measured on a daily basis. Therefore,
accurate daily tracking of Jordan Lake water supply allocations can only be performed for
the combined Jordan Lake water supply allocation for Cary, Apex, Morrisville, and RTP
South. Figure 1 shows the partners’ combined water supply withdrawals and the allocation
storage level for 2011. The minimum storage level for the combined allocation was 89.7%
occurring on September 5, 2011. The average percent storage was 98.9% for 2011.
0.00
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20.00
25.00
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35.00
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4,780
6,780
8,780
10,780
12,780
14,780
16,780
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-ft
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Figure 1. Cary/Apex/Morrisville/RTP South Water Supply Allocation and
Withdrawals for 2011
Full Pool
= 39% of Water Supply Pool
= 17,862 acre-feet
Individual Jordan Lake water allocation withdrawals are estimated on a daily basis using
monthly Morrisville and RTP South water usage records. Daily water use for Morrisville is
estimated from monthly or more frequent retail meter readings by assuming that water
usage variations between meter readings follow the same patterns as the total combined
water use (“Net Cary” use). Daily water use for RTP South is estimated similarly using
monthly retail meter readings, assuming that water usage trends throughout the month
follow similar patterns as Net Cary. For a given day, the ratio of daily Net Cary water use to
average Net Cary water use for the period between meter readings is applied to Morrisville
and RTP South metered water use.
Levels in individual water supply pools are calculated on a daily basis using daily water use
estimates and daily lake inflows. Lake inflow data is obtained from the US Army Corps of
Engineers and allocated to each water supply pool according to the percentage allocation
held. Any inflow amount that would fill the allocated storage above 100 percent is not
stored. Any time the elevation in Jordan Lake is at or above 216 feet mean sea level, the
water supply pools are reset to 100 percent full. If any allocation holder or larger pool has
excess inflow, it is first distributed within that pool to another user, if needed, before being
“spilled.”
Daily Withdrawal
Storage
2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
1-4
The daily Cary/Apex withdrawal amounts are estimated by subtracting the estimated daily
Morrisville and RTP amounts from the metered total daily use; Cary amounts are then
estimated by subtracting the daily recorded Apex use from the remainder.
Cary/Apex holds a water supply storage allocation equal to 32 percent of the water supply
pool or 14,656 acre-feet. Figure 2 shows the Cary/Apex water supply withdrawals and the
allocation storage level for 2011. The minimum storage level for the Cary/Apex allocation
was 88.3% occurring on September 5, 2011. The average percent storage was 99.4% for 2011.
5.00
10.00
15.00
20.00
25.00
30.00
35.00
5,000
6,000
7,000
8,000
9,000
10,000
11,000
12,000
13,000
14,000
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a
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-ft
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Figure 2. Cary/Apex Water Supply Allocation and Withdrawals for 2011
Full Pool
= 32% of Water Supply Pool
= 14,656 acre-feet

Storage
Daily Withdrawal
2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
1-5
Morrisville holds a water supply storage allocation equal to 3.5 percent of the water supply
pool or 1,603 acre-feet. Figure 3 shows the Morrisville water supply withdrawals and the
allocation storage level for 2011. The minimum storage level for the Morrisville allocation
was 81.3% occurring on September 5, 2011. The average percent storage was 97.3% for 2011.
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
500
700
900
1,100
1,300
1,500
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-ft
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Figure 3. MorrisvilleWater Supply Allocation and Withdrawals for 2011
Full Pool
= 3.5% of Water Supply Pool
= 1,603 acre-feet

Storage
Daily Withdrawal
2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
1-6
RTP South holds a water supply storage allocation equal to 3.5 percent of the water supply
pool or 1,603 acre-feet. Figure 4 shows the RTP South supply withdrawals and the allocation
storage level for 2011. The minimum storage level for the RTP South allocation was 98.3%
occurring on September 20, 2011. The average percent storage was 99.9% for 2011.
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1,000
1,100
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1,300
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Figure 4. RTP South Water Supply Allocation and Withdrawals for 2011
Full Pool
= 3.5% of Water Supply Pool
= 1,603 acre-feet

Daily Withdrawal
Storage
2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
2-1
2.0 IBT Monitoring
Daily IBT estimates for the certificate holders are included in Appendix B. Estimates are
provided for the period January 1, 2011 through December 31, 2011. The maximum day IBT
transfer during the calendar year 2011 was 21.7 mgd, which occurred on July 29, 2011. This
represents 90 percent of the permitted IBT transfer, 24 mgd, under the certificate approved
by the EMC on July 12, 2001. The annual average IBT transfer was 14.1 mgd during calendar
year 2011. The average daily consumptive use was 18.0% for the period January 1, 2011
through December 31, 2011. Historical consumptive use is shown in Table 2-1.
TABLE 2-1
Historical Consumptive Use for Cary, Apex, Morrisville, and RTP South
Year Average Daily Finished
Water Demand
(mgd)
Average Daily
Consumptive Use
(mgd)
% Consumptive Use
19981 12.2 2.4 19.7%
19991 12.6 2.1 16.7%
2000 13.0 1.8 13.8%
2001 14.1 2.0 14.7%
2002 14.9 3.0 20.1%
2003 13.9 1.4 10.0%
2004 14.8 2.2 14.9%
2005 15.6 2.7 17.3%
2006 15.7 2.3 14.6%
2007 17.9 4.2 23.5%
2008 16.1 2.5 15.5%
2009 16.1 2.3 14.4%
2010 17.1 3.1 18.1%
2011 17.2 3.1 18.0%
1. Includes some water use by Holly Springs. Holly Springs purchased water from Apex in 1998 and 1999.

The distribution of consumptive uses between the Haw, Cape Fear, and Neuse River
subbasins for 2011 was estimated based on historical water use in each basin as determined
by billing records for each certificate holder. During 2011, based on the 2010 annual report,
it was assumed that 29.0% of water use occurred in the Haw subbasin, 0.9% of water use
occurred in the Cape Fear subbasin, and 70.1% of water use occurred in the Neuse River
subbasin. The certificate holders track historical use by assigning a subbasin to each
customer. Data on the distribution of water use between subbasins for each entity from 2000
through 2011, based on billing records, is shown in Table 2-2. For purposes of calculating
daily IBT amounts in 2012, the certificate holders estimate that 29.0% of their water use will
occur in the Haw subbasin and that 0.9% of their water use will occur in the Cape Fear
subbasin.

2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
2-2

TABLE 2-2
Distribution of Water Billed to Retail Customers by River Subbasin
Year Cary Apex Morrsiville1 RTP South

Total
Water
Use
(mgd)
Water
Use in
Haw
(mgd)
% Use
in Haw
Total
Water
Use
(mgd)
Water
Use in
Haw
(mgd)
% Use
in Haw
Water
Use in
Cape
Fear
(mgd)
% Use
in Cape
Fear
Total
Water
Use
(mgd)
Water
Use in
Haw
(mgd)
% Use
in Haw
Total
Water
Use
(mgd)
Water
Use in
Haw
(mgd)
% Use
in Haw
2000(1) 9.29 0.82 8.8% 1.65 0.82 49.9% 0.07 4.3% 0.86 0.05 6.20% 0.27 0.27 100%
2001 10.73 1.07 10.0% 1.88 1.03 54.8% 0.08 4.3% 1.05 0.06 6.20% 0.31 0.31 100%
2002 10.23 1.23 12.0% 2.15 1.29 60.0% 0.08 3.7% 1.18 0.14 11.2% 0.39 0.39 100%
2003 9.02 0.75 8.3% 1.94 1.15 59.3% 0.073 3.8% 1.10 0.15 14.0% 0.36 0.36 100%
2004 9.69 1.21 12.5% 2.12 1.28 60.2% 0.080 3.8% 1.26 0.19 14.9% 0.35 0.35 100%
2005 10.38 1.47 14.2% 2.25 1.40 62.2% 0.092 4.1% 1.32 0.21 16.1% 0.44 0.44 100%
2006 9.79 1.15 11.8% 2.20 1.35 61.5% 0.085 3.9% 1.36 0.22 16.1% 0.41 0.41 100%
2007 10.90 1.52 13.9% 2.75 1.74 63.3% 0.110 4.0% 1.39 0.24 17.3% 0.48 0.48 100%
2008 9.83 1.43 14.5% 2.36 1.46 62.0% 0.09 4.0% 1.33 0.26 19.5% 0.41 0.41 100%
2009 10.23 1.68 16.4% 2.65 1.68 63.3% 0.13 5.1% 1.40 0.29 20.4% 0.39 0.39 100%
2010 11.34 2.09 18.4% 2.97 1.89 63.6% 0.14 4.6% 1.64 0.34 20.8% 0.40 0.40 100%
2011 11.29 1.98 17.5% 2.73 1.72 62.9% 0.13 4.6% 1.71 0.34 20.0% 0.43 0.43 100%
1. Water use by basin for the Town of Morrisville is unavailable for 2000, and so the percentage was assumed to be the same as in 2001.

2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
2-4
Table 2-3 shows the combined water use for the certificate holders and the percentage water
use in the Haw and Cape Fear River Subbasins.
TABLE 2-3
Historical Water Use in the Haw and Cape Fear River Subbasins for Cary, Apex, Morrisville, and RTP South
Year Total Billed
Water Use
(mgd)
Water Use in
Haw Subbasin
(mgd)
Percent Use in
Haw Subbasin
Water Use in
Cape Fear
Subbasin
(mgd)
Percent Use in
Cape Fear
River Subbasin
2000(1) 12.07 1.97 16.3% 0.07 0.6%
2001 13.97 2.47 17.7% 0.08 0.6%
2002 13.95 3.05 21.8% 0.08 0.6%
2003 12.42 2.41 19.4% 0.07 0.6%
2004 13.42 3.03 22.5% 0.08 0.6%
2005 14.39 3.53 24.5% 0.09 0.6%
2006 13.75 3.13 22.7% 0.09 0.6%
2007 15.52 3.98 25.6% 0.11 0.7%
2008 13.93 3.96 25.6% 0.09 0.7%
2009 14.67 4.04 27.5% 0.13 0.9%
2010 16.34 4.71 28.8% 0.14 0.8%
2011 16.16 4.47 27.7% 0.13 0.8%
1. Water use by basin for the Town of Morrisville is unavailable for 2000, and so the percentage was assumed to be the
same as in 2001.

In 1998, 1999, 2000 and 2007 Apex along with Cary implemented mandatory irrigation
restrictions due to water supply limitations as well as IBT permit restrictions. The Town of
Morrisville asked residents to voluntarily conserve water beginning in 1998, further
implementing mandatory water use restrictions in July 1999. The restrictions reduced
consumptive water use from what would normally be expected during those years. In 2000
Cary implemented a year round conservation program which includes: alternate day
watering, prohibition of water waste, a rain sensor requirement on all irrigation systems,
and an increasing block rate structure. In 2002 all of the Towns under this IBT certificate
instituted mandatory restrictions because of regional drought conditions, but they were
implemented after June which was when the highest water use occurred that year. Apex
continued stage II water restrictions through December 29, 2005 when they returned to stage
I, or voluntary water conservation measures. Starting April 3, 2006 the Cary and Morrisville
utility systems merged. As part of this merger Morrisville adopted Cary’s water
conservation ordinances and Cary staff began education and enforcement in both Cary and
Morrisville. On October 1, 2007Apex adopted a year round alternate day watering
ordinance. Also in 2007 Apex, Cary, Morrisville and RTP South implemented mandatory
irrigation restrictions. The changes in watering rules were made in response to Governor
Easley’s call for tougher water restrictions. The Apex Town Council adopted a ban on use of
2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
2-4
outdoor fountains and automated and sprinkler irrigation effective October 19, 2007. On
November 1st 2007, the Town of Cary issued a Water Shortage Declaration, and citizens in
Cary, Morrisville and RTP South connected to the Town of Cary’s water system were no
longer able to water outdoors using irrigation systems, sprinklers, or other automated
watering devices; the Town also discontinued issuing three-week exemptions to its year-
round watering rules for establishing new grass or reseeding. These mandatory irrigation
restrictions for all the partners remained in effect until April 1, 2008.

2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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3.0 Compliance with Certificate Conditions
A summary of the conditions of the IBT certificate dated July 12, 2001 along with the current
status of compliance for each is provided below.
Condition 1 (2010 Required Return)
The holders of the certificate, after 2010, shall return water supplied from the Haw River Basin used
in the Neuse River Basin to either the Haw or Cape Fear River Basins as described below.
a) Any water use in the Neuse Basin in excess of 16 million gallons per day adjusted on an
average daily basis shall be returned.
b) Water used for consumptive purposes in the Neuse Basin will not be subject to this condition
Compliance with this condition was not required until after 2010. However, the calculations
for determining compliance with Condition 1, shown in Table 3-1, began in 2001. The
amounts in column (a) are based on the percentage of billed water use in the Neuse Basin
applied to the total amount of water used. As reported in the 2010 annual report, the
calculation method was changed so Table 3-1 values shown reports for 2009 and earlier will
differ from what is shown in later years.
Figures 5 and 6 depict both the short and long-term plans for complying with Condition 1.
For IBT purposes, it would be best to return reclaimed water to the source (Haw) basin and,
more specifically, directly to the water supply source – Jordan Lake. Cary began returning
reclaimed water to Jordan Lake on April 19, 2005 by way of a wastewater treatment
interlocal agreement (ILA) between Cary and Durham County. Per the ILA, Durham County
treats wastewater for Cary from a service area that includes portions of Cary and Morrisville
and all of RTP South. The reclaimed water is returned to Jordan Lake after being treated at
the Durham County Triangle WWTP. Unfortunately, this arrangement to return reclaimed
water to Jordan Lake is not feasible as a long-term management approach. Durham County
will need the capacity of its Triangle WWTP for its own service area after 2015. A new
discharge to Jordan Lake was investigated but deemed infeasible because of TMDL
requirements and the nutrient management strategy that has been developed for Jordan Lake.

Since return of reclaimed water to the water supply source in the Haw basin is not feasible
for the long-term, Apex, Cary, and Morrisville, which are the Western Wake Partners
(Partners), investigated other alternatives and are implementing the Western Wake Regional
Wastewater Management Facilities which will include reclaimed water discharge to the Cape
Fear River below Buckhorn Dam. Apex, Cary and Morrisville wastewater will be treated at
the new Western Wake Water Reclamation Facility.

The Western Wake Regional Wastewater Management Facilities project includes multiple
components, which are being constructed through eight major construction contracts.
Construction on the Water Reclamation Facility began in September 2011 and all other
components are expected to begin construction in 2012. More information about the status of
the project can be found at the Western Wake Partners’ website at
http://www.westernwakepartners.org. The new facilities are expected to be on-line in 2014.

2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
3-2
Apex
Holly Springs
Cary/Morrisville
Figure 5. Return to Haw River Basin, Before Western Wake WRF Startup (about 2014)
Condition 1
Return to
Haw River
(Source)
Withdrawal
Discharge
2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
3-3
Apex
Holly Springs
Cary/Morrisville
Figure 6. Proposed Return to Cape Fear River Basin, After Western Wake WRF Startup
(about 2014)
Condition
1 Return
to Cape
Fear Basin
Withdrawal
Discharge
2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
3-4

Table 3-1
Summary of Compliance with Certificate Condition No. 1
Year Neuse
Finished
Water
from the
Haw
(mgd)
Peaking
Factor
16 mgd
MDD
adjusted
to ADD
Consumptive
Use Factor
(%)
Neuse
Consumptive
Use (from
the Haw)
(mgd)
Required
Return if
After
2010
(mgd)
Amount
Returned
(mgd)
(a) (b) (c)=16/(b) (d) (e)=(a)*(d) (f)=(a)-
(c)-(e)
(g)
2001 5.1 1.64 9.76 20% 1.0 0.0 0.0
2002 11.3 1.64 9.76 20% 2.3 0.0 0.0
2003 10.6 1.64 9.76 20% 2.1 0.0 0.0
2004 11.6 1.64 9.76 20% 2.3 0.0 0.0
2005 11.9 1.64 9.76 20% 2.4 0.0 0.3
2006 11.5 1.64 9.76 20% 2.3 0.0 0.5
2007 13.3 1.64 9.76 20% 2.7 0.9 0.8
2008 11.5 1.64 9.76 20% 2.3 0.0 1.2
2009 11.5 1.64 9.76 20% 2.3 0.0 1.3
2010 12.2 1.64 9.76 20% 2.4 0.0 1.7
2011 12.0 1.64 9.76 20% 2.4 0.0 2.0
a = Average annual transfer from Haw to Neuse (see Table B-1)
b = Peaking factor specified in Certificate for first year, and to be approved by DWR thereafter
d = Percent consumptive use specified in Certificate for first year and to be approved by DWR thereafter
g = Average annual wastewater discharges and water reuse in Haw and Cape Fear Basins (see Table B-1)

Condition 2 (Facilitate Allocation Use)
The holders of this certificate shall manage the authorized transfer amount in such a way that none of
the individual petitioners (Towns of Cary, Apex, Morrisville, and Wake County [for RTP South]) are
prevented from fully using their respective Jordan Lake water supply allocations.
The IBT certificate requirements were not a limitation on Jordan Lake withdrawals for any
of the allocation holders in 2011.
Condition 3 (Disaggregation of IBT Amount)
If the certificate holders discontinue their cooperative service agreement with each other, the
maximum day permitted transfer will be adjusted by the Division of Water Resources based on the
2030 projections of each applicant at that time.
The cooperative service agreements between the certificate holders have remained in effect
during 2011.

2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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Condition 4 (Compliance and Monitoring Plan)
Prior to transferring water under this certificate, the holders of this certificate shall work with the
Division of Water Resources to develop compliance and monitoring plan subject to approval by the
Division. The plan shall include methodologies and reporting schedules for reporting the following
information: maximum day transfer amounts, compliance with permit conditions, progress on
mitigation measures, drought management, and reporting. A copy of the approved plan will be kept
on file with the Division for public inspection. The Division of Water Resources shall have the
authority to make modifications to the compliance and monitoring plan as necessary to assess
compliance with the certificate.
Cary, Apex, Morrisville, and RTP South submitted a Compliance and Monitoring Plan
concurrent with the submittal of the 2001 report. In 2003 the Division of Water Resources
agreed to modify the submittal date of each annual report to be May 1 of the following year.
Condition 5 (EMC Consideration of Impacts)
If either the EIS is found at a later date to be incorrect or new information becomes available such that
the environmental impacts associated with this transfer are substantially different from those
projected impacts that formed the basis for the above Findings of Fact and this certificate, the
Commission may reopen the certificate to adjust the existing conditions or require new conditions to
ensure that the detriments continue to be mitigated to a reasonable degree.
This condition requires no action by the certificate holders.
Condition 6 (Intake Access)
The Towns of Cary and Apex shall be required to provide access at their existing intake site to other
Jordan Lake water allocation holders that need access to utilize their allocation to the extent that this
additional use is determined to be feasible by the Division of Water Resources. The cost associated
with getting the necessary permits, engineering design, and associated construction costs are the
responsibility of the allocation holder(s) requesting the access and not Cary and Apex.
The Town of Cary has continued to provide retail water service to RTP South and starting
April 3rd 2006 has merged utility services with the Town of Morrisville. Chatham County
has continued to access their allocation through the Cary/Apex raw water intake on Jordan
Lake.
Condition 7 (Drought Management Plan)
Prior to transferring water under this certificate, the Towns of Cary, Apex, and Morrisville, and
Wake County (for RTP South) shall develop individual water shortage response plans subject to
approval by the Division. The holders of this certificate shall develop a drought management plan for
the interbasin transfer, incorporating the individual water shortage response plans and subject to
approval by the Division. The plans shall tie specific water conservation actions to the percent storage
remaining in each of the petitioners’ Jordan Lake water supply accounts. A copy of the approved plans
shall be kept on file with the Division for public inspection. The Division of Water Resources shall
have the authority to approve modifications to the drought management plan as necessary.
Water Shortage Response Plans for each certificate holder were submitted as attachments to
the 2001 Annual Report and have been updated in later years. The current Water Shortage
Response Plans, which remained unchanged during 2011, are attached in Appendix C.
2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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Condition 8 (Stream Buffer Rules)
Within six months from the effective date of this certificate, the Towns of Cary, Apex, and
Morrisville, and Wake County (for RTP South) shall enact ordinances similar to or more protective
than the Neuse River buffer rules (15A NCAC 2B.0233) for the parts of their jurisdictions that are
within the Jordan Lake watershed. These buffer requirements shall be subject to approval by the
Division of Water Resources after consultation with the Division of Water Quality and shall be
adopted as local ordinances.
Each Town’s buffer ordinance was submitted with the 2001 Annual Report.
In 2004 there was one change:
1. The Town of Morrisville put 370,312 feet of 50-foot wide stream buffers under a
conservation easement.
In 2006 there were three changes:
1. The Town of Apex approved amendments to UDO Section 6.1.11 Riparian Buffers
which clarified the zones for riparian buffers associated with perennial streams Zone
1 of the perennial buffer was defined as the inner 60 feet and zone 2 as the outer 40
feet.
2. The Town of Apex clarified the uses permitted within riparian buffers to allow new
stormwater ponds (excluding dry ponds) that control nitrogen and associated
stormwater outfalls in zone 2 of the riparian buffer provided that diffuse flow is met
through zone 1 of the buffer. This is the outer 20 feet for an intermittent stream
buffer (50 feet) and the outer 40 feet for a perennial stream buffer (100 feet).
3. Wake County (for RTP South) adopted a Unified Development Ordinance (UDO) on
April 17th 2006, which repealed and replaced the existing Zoning and Subdivision
Ordinances. The UDO consolidates development regulations into a single document.
In 2008 there was 1 change:
1. The Town of Morrisville adopted new engineering standards (Design and
Construction Ordinance), effective February 2008, which adopted revised stormwater
quantity and quality standards for the Town, including application of Neuse River
Basin performance standards throughout the jurisdiction.
In 2009 there was 1 change:
1. The Town of Morrisville approved amendments to its zoning ordinance (Zoning
Ordinance), effective July 23, 2009, which included provisions for riparian buffers in
the Cape Fear River Basin in response to the Jordan Lake Nutrient Management
Strategy Rules.
In 2010 there were 2 changes:
1. The Town of Apex approved changes to its riparian buffer rules (Watershed
Protection Overlay Districts), effective November 16, 2010, which incorporated the
requirements of the Jordan Lake Nutrient Management Strategy Rules.
2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
3-7
2. The Town of Cary approved minor changes to its riparian buffer rules (Land Use
Development Ordinance) to remove allowable uses in its table of uses that conflicted
with the Town’s 100 ft. buffer rule and the state’s 50 ft. buffer rule.
In 2011 there were 2 changes:
1. The Town of Cary approved modifications to the Jordan Lake Buffer to comply with
the Jordan Lake Rules passed in 2009, effective July 14, 2011.
2. The Town of Morrisville adopted a Riparian Buffer Ordinance (for lands within both
the Neuse River Basin and the Jordan Lake Watershed) to comply with the Jordan
Lake Rules.
2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
A-1

Appendix A:
Daily Tracking of Combined Jordan Lake Water Supply
Allocations for 2011
2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
B-1

Appendix B
Daily Interbasin Transfer Estimates for 2011

2011 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
C-1

Appendix C:
Towns of Cary and Apex Water Shortage Response Plans
Updated for 2011