Agenda - 12-01-2014 - 7c - Laserfiche WebLink

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Section 8 a Conclusions and Recommendations that improvements implemented in the City's system lythe time build-out werotnocco may address the minor deficiencies. Therefore, no additional water distribution infrastructure isrecommended. The only municipal wastewater infrastructure within the EnmBDD isu small pump station near the eastern most boundary ny the project area that conveys u small amount of flow te the City. Therefore, a wastewater collection and conveyance system backbone is required within the EuoBDD. Recommended collection system infrastructure and associated conceptual opinions of probable cost were developed for the Low and High wastewater flow scenarios. Tables 8-2 and 8-3 present the recommended infrastructure and associated.cost for the Low and High flow scenarios, respectively. lo order to construct the recommended infrastructure, a number of regulatory permits will be required. Iuuo effort tominimize environmental impacts and associated permitting efforts, trmudl*ou construction methodologies were assumed for stream and roadway crossiugm.7bepokan1bUoeedfor an EA/EIS could be required as a result of the amount of infrastructure included in the project, but is not a certainty. If the gravity sewer and forco main proposed to parallel US Hwy 70 cannot be installed within the NCDOT road ROW, the need for an alternative alignment qnd/or easement acquisition could be required, which would lengthen the project schedule and inipact project cost. This would need tobe addressed early iu the design Dbu�eto minimize impacts. It is recognized that the costs presented io either Table U-2or Table B-3 would bea significant investment for the County and that immediately funding the project jo its entirety will hoa challenge. Therefore, the following options to potentially reduce project cost aild/or phase the improvements were identified and are presented below. � Construct only the pump station and force main. Collection system infrastructure could be constructed by developers on an as-needed basis, orbv the County if additional funding becomes available. Construct the pump station, force main, and only the most cridc;JI collection system infrastructure. The collection system piping neoouzoueodedfomtbisupdoniodndoagravdtyyipoy 2, 4, and 6, as identified on Figure 6-1. Constructing these gravity pipes would prevent developers from having to impact Rhodes Creek and DS Hwy 7U, both nf which will have. permitting challenges. _ Construct the force main from the proposed pump station tnamanhole in the Citys wastewater collection system near the Eno 2DDboundary, as opposed to all the way to the recommended location in the South Durham Basin, doscribed in Section S. This 6ption would temporarily reduce the amount of force main and gravity sewer pipe by approximately 11,000 feet. It is expected that this alternative discharge point will only haVe sufficient capacity tO receive wastewater flows iu the oempternu and that the additional force main Would bo needed iothe future. The force main and pump ntatinuvvyu]dot�\bmdo5iQuodto handle future flows mothat »vheuthe discharge point into the Ci , n wastewater ayotetuneeds tube relocated tothe rncoozomeodedlocodouintbeSoutbDurbusbBuniu,tboexi#iogforcmcndiuvvooljobh/buveto be extended (i.e. not upgraded). Additional modeling and engineering evaluation will be required to determine where and how much wastewater flow can be discharged to the alternative location iu the City /osystem. 8-2 With