Secondary and Cumulative Impacts Master Management Plan - 2014

TOWN OF MORRISVILLE

Morrisville, to unify, streamline, and optimize collection system operations by abandoning surplus lift stations and merging or redirecting wastewater flows to the Town of Cary’s system, thereby enhancing system reliability and minimizing operational costs. The Town of Cary will also build sewer lines and pump stations to convey additional wastewater to the North Cary WRF and WWRWRF, as population growth and development occur. Exact locations of lines and supporting infrastructure are not known at this time; however, knowledge of the general location of the main sewer lines and population projections that are consistent with planned infrastructure and land use planning will enable SCI to be examined. Exact locations will be determined during development of the environmental documents that examine alternatives and direct environmental impacts of the alternatives. Figure 2-1 illustrates the location of existing and proposed wastewater infrastructure within the Town’s Planning Area. As part of this collaborative effort associated with the WWRWRF, the Towns of Cary, Apex, and Morrisville are also addressing a mandate regarding their interbasin transfer (IBT) certificate, which requires the towns to return water to the Haw River or Cape Fear River basins after 2010. The operation of the WWRWRF meets this condition. The current IBT certificate, issued in 2001, allows transfers of up to 24 million gallons per day (MGD), on a maximum day basis, from the Haw River subbasin (for which Jordan Lake is the water supply source) to the Neuse River subbasin. In 2013, the maximum daily IBT amount for the Towns of Cary, Apex, Morrisville, and RTP South was 19.2 MGD, while the annual average IBT amount was 13.8 MGD (Town of Cary, 2014a). On September 20, 2013, the Towns of Cary, Apex, and Morrisville, and Wake County notified the Environmental Management Commission (EMC) that they are requesting a modification of the IBT certificate to address water needs through 2045. One objective that would be accomplished by this modification is a shift from a maximum-day IBT calculation to IBT calculated as the daily average of a calendar month, according to the changes to NCGS 143-215.22L (regulation of surface water transfers) based on Session Law 2013-388. 2.1.3 Reclaimed Water The Town of Morrisville will continue to work with the Town of Cary to identify potential reclaimed water opportunities. The Town of Cary is in the process of designing a connector pipeline that will bring reclaimed water from the North Cary WRF to the West Service Area. This line will pass directly through the Town, providing the opportunity for reclaimed water service in its jurisdiction (Figure 2-2). The Town of Cary’s Effective Utilization of Reclaimed Water System policy states that residents and businesses use the Town’s reclaimed water system for secondary plumbing to the maximum extent possible, and that new development within the designated service areas connect to the reclaimed water system. More specific details regarding service areas and proposed infrastructure is found in the Town of Cary’s Reclaimed Water Master Plan Update (CDM, 2013). Water conservation is a benefit to the environment and community which can be achieved, in part, through water reclamation. Locations of proposed reclaimed water infrastructure will be determined during environmental studies that examine direct impacts of the proposed infrastructure. In general, unlike other types of infrastructure, water reclamation does not support additional growth, and therefore does not have SCI associated with it. For direct growth, using reclaimed water will help extend the viability of the water supply

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