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2004 IBT Annual Report final C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC 2004 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 2005 Prepared by: Leila R. Goodwin, P.E. Water Resources Manager Town of Cary P.O. Box 8005 Cary, NC 27512-8005 919-462-3846 leila.goodwin@townofcary.org C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC Table of Contents Executive Summary...............................................................................................................ES-1 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 2004...................................................................................................................A-1 Appendix B: Daily Interbasin Transfer Estimates for 2004.............................................B-1 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC ES-1 Executive Summary The 2004 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. In 2004, the certificate holders complied with all conditions of their IBT certificate. The maximum daily IBT amount for Cary, Apex, Morrisville, and RTP South was 22.6 million gallons per day (mgd). The annual average IBT amount was 14.2 mgd. IBT amounts and a summary of Jordan Lake withdrawals are provided in Table ES-1. The daily IBT amounts in 2004 for Cary, Apex, Morrisville, and RTP South are shown in Figure ES-1. 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) 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 89% 2004 17.0 25.5 2.8 6.1 14.2 22.6 94% 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. 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC ES-2 Figure ES-1: Daily Interbasin Transfer for Cary, Apex, Morrisville and RTP South [Haw Sub-Basin to Neuse Sub-Basin] 0.00 5.00 10.00 15.00 20.00 1/1/04 2/1/04 3/1/04 4/1/04 5/1/04 6/1/04 7/1/04 8/1/04 9/1/04 10/1/04 11/1/04 12/1/04 Interbasin Transfer (mgd) Cary Apex Morrisville RTP 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC 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, 2004 through December 31, 2004 is included in Appendix A. The water supply pools for each allocation holder were full on January 1, 2004. For 2004, the maximum day withdrawal for all certificate holders was 25.5 mgd, which occurred on May 18. The average daily withdrawal for all certificate holders was 17.0 mgd during 2004 (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 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 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC 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. In 2004, finished water demands averaged 14.8 mgd and the maximum day demand was 25.8 mgd. The maximum day peaking factor was 1.74 in 2004. 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 1.64 19992 12.6 21.5 1.70 2000 13.0 21.6 1.66 2001 14.1 22.0 1.56 2002 14.9 25.6 1.72 2003 14.0 19.9 1.43 2004 14.8 25.8 1.74 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. 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC 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, Morrsiville, and RTP South. Figure 1 shows the water supply withdrawals and the allocation storage level for 2004. The combined allocated storage stayed at 100 percent full for all of 2004. Figure 1. Cary/Apex/Morrisville/RTP South Water Supply Allocation and Withdrawals for 2004 6,700 8,700 10,700 12,700 14,700 16,700 01/01/04 01/31/04 03/01/04 04/01/04 05/01/04 06/01/04 07/01/04 07/31/04 08/31/04 09/30/04 10/31/04 11/30/04 12/30/04 Storage Level (ac-ft) 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00 28.00 Water Supply Withdrawals (mgd) Full Pool = 39% of Water Supply Pool = 17,862 acre-feet Individual Jordan Lake water allocations are estimated on a daily basis by estimating daily water usage for Morrisville and RTP South from monthly 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. By assuming that water usage trends throughout the month follow similar patterns as for 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”. 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC 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 9,618 acre-feet. The allocated storage for each of the four users – Cary, Apex, Morrisville and RTP South – remained at 100 percent full for all of 2004. 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC 2-3 2.0 IBT Monitoring Daily IBT estimates for the certificate holders are included in Appendix B. Estimates are provided for the period January 1, 2004 through December 31, 2004. The maximum day IBT transfer during the calendar year 2004 was 22.6 mgd, which occurred on May 29, 2004. This represents 94 percent of the permitted IBT transfer under the certificate approved by the EMC on July 12, 2001. The annual average IBT transfer was 14.2 mgd during calendar year 2004. The average daily consumptive use was 15% for the period January 1, 2004 through December 31, 2004. Historical consumptive use is shown in Table 2-1. The distribution of consumptive uses between the Haw, Cape Fear, and Neuse River subbasins for 2004 was based on historical water use in each basin as determined by billing records for each certificate holder. For 2004, it was assumed that 21% of water use occurred in the Haw subbasin, 0.6% of water use occurred in the Cape Fear subbasin, and 78.4% of water use occurred in the Neuse River subbasin. The certificate holders have begun tracking historical use by assigning a subbasin to each customer. Data on the distribution of water use between subbasins for each entity from 2000 through 2004, based on billing records, is shown in Table 2-2. In 1998, 1999, and 2000 Apex and Cary implemented mandatory irrigation restrictions due to water supply limitations and IBT permit restrictions. The Town of Morrisville asked residents to voluntarily conserve water beginning in 1998, and implemented mandatory water use restrictions in July 1999. The restrictions reduced consumptive water use from what would normally be expected during those years. In 2002 all the Towns had mandatory restrictions because of regional drought conditions, but they were implemented after June, which was when all-time high water use occurred. There were no water restrictions in 2003 or 2004. 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 20.0% 2003 14.0 1.4 10.0% 2004 14.8 2.2 15.0% 1. Includes some water use by Holly Springs. Holly Springs purchased water from Apex in 1998 and 1999. 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC 2-3 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 Fear1 Total Water Use (mgd) Water Use in Haw (mgd) % Use in Haw2 Total Water Use (mgd) Water Use in Haw (mgd) % Use in Haw 2000 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% 0.39 0.39 100% 1. Water use by basin for the Town of Morrisville is unavailable for 2000, and so was assumed to be the same as in 2001. 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC 2-3 Table 2-3 shows the combined water use for each of 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)1 Percent Use in Haw Subbasin Water Use in Cape Fear Subbasin (mgd)1 Percent Use in Cape Fear River Subbasin 2000 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 13.46 3.06 22.8% 0.08 0.6% 1. Water use by subbasin for the Town of Morrisville is unavailable for 2000, and so was assumed to be the same as in 2001. For purposes of calculating daily IBT amounts in 2004, the certificate holders used 21% for the portion of their water use that occurred in the Haw subbasin and 0.6% as the portion used in the Cape Fear subbasin. For purposes of calculating daily IBT amounts in 2005, the certificate holders estimate that 23% of their water use will occur in the Haw subbasin and that 0.6% of their water use will occur in the Cape Fear subbasin. 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC 3--1 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 is not required until after 2010. However, the calculations for determining compliance with Condition 1 are shown in Table 3-1. Note that revised calculations for 2001 result in different values then were included in the 2001 Annual Report. Cary, Apex and Morrisville are implementing the Western Wake Regional Water Reclamation Facility, and Holly Springs is participating in the effluent discharge facilities to the Cape Fear River below Buckhorn Dam. The project partners are in the permitting and financing stages of the project and expect to begin design in 2005. More information about the status of the study can be found at the Western Wake Regional Water Management Facilities website at www.westernwakepartners.org. 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 6.8 1.64 9.8 20% 1.4 0.0 0 2002 13.5 1.64 9.8 20% 2.7 1.0 0 2003 13.4 1.64 9.8 20% 2.7 1.0 0 2004 14.2 1.64 9.8 20% 2.8 1.6 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) 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC 3--2 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 was not a limitation on Jordan Lake withdrawals for any of the allocation holders in 2004. Condition 3 (Disagreggation 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 projected of each applicant at that time. The cooperative service agreements between the certificate holders have remained in effect during 2004. 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 has an agreement with the Town of Morrisville for water treatment. The Towns of Cary and Apex 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC 3--3 have also entered into an agreement to allow Chatham County access to 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. 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. C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC A-1 Appendix A: Daily Tracking of Combined Jordan Lake Water Supply Allocations for 2004 2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville C:\DOCUMENTS AND SETTINGS\PHIL FRAGAPANE\LOCAL SETTINGS\TEMP\2004IBTANNUALREPORT.DOC C-1 Appendix B Daily Interbasin Transfer Estimates for 2004