11/16/2010 SEWER COMMISSION Minutes

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inspection of the project. The Chair added that Mr. Rowley has designed and inspected similar systems. Regarding the proposed route of the pipeline, it was discovered that Old Barnstable is only a 33 foot layout offering limited space. Although Route 151 has a 100 foot layout, a gas line runs alongside the road. Horsley and Witten has decided to place the sewer line on school property just off of the road layouts. The Chair has inquired whether a 6 inch main could be considered in place of a 4 inch main, but he has not received a response from Horsley and Witten. An additional meeting to discuss the project has been scheduled for 3 p.m. Thursday at Town Hall. The Chair suggested that Commissioners review the proposed agreement between Mashpee and the Mashpee Housing Authority and Housing Assistance Corporation. The draft has been presented to Town Counsel from the 14AC attorney but has not yet been finalized. The draft agreement freezes sewer rates for the next 20 years. Commissioners may forward comments about the agreement to the Chair prior to Friday. Mr. Lyon asked Mr. Gregg about the ramifications of changing the pipe from 4 inches to 6 inches. Mr. Gregg responded that the increased size would be in response to the possibility of future expansion and an ability to send larger flows to the treatment plant. Mr. Lyons questioned the cost difference and whether there could be a mechanical limitation with a larger size. Chairman Fudala noted that the costs will be the responsibility of the development. Mr. Gregg is not involved with the project but noted that if the pipe material is the name, there is virtually no cost difference between the 4 inch pipe and the 6 inch pipe. In order to maintain velocity in the larger pipe, more flow or a larger pump would be needed. Mr. Klenert questioned the future benefit of a larger pipe. Mr. Lyons responded that it would save the cost of digging an additional trench as Mashpee reaches buildout. Mr. Gregg added that it is possible in 20 years that the Town may wish to pursue another option. Mr. O'Hara suggested that the 6 inch pipe may not be large enough. The Chairman questioned use of PVC versus ductile iron. It was confirmed that SDR21 PVC has been proposed for the project and Mr. Gregg stated that it is a thicker pipe. Mr. Gregg also stated that ductile iron prevents breakthrough if digging occurs nearby and that PVC is easily repaired. Sandwich Issues Mr. Marcelli reported that Sandwich is just beginning their joint water and wastewater treatment plan and may have selected Wright Pierce to conduct the joint study_ Commissioners expressed interest in knowing how Sandwich intends to balance the management of water and sewer. The Chair questioned what part of town they plan to address for the study and whether a scope was available. Mr. Marcelli stated that Mr. Mason expressed interest in talking with Mashpee once they have more information from the study, particularly their east side of town. Mr. Marcelli invited him to attend Mashpee Sewer Commission meetings. New Developments -Stratford Ponds is moving ahead with improvements to their treatment plant by changing their aeration system. -Cotuit Meadows has begun construction on their wastewater treatment plant and intend to tie in one Mashpee property as well as the Rt. 28 nursing home in Barnstable and the Shellback Office Complex has the option to tie into the system in the future. Sewer/Funding Issues Chairman Fudala reported that Barnstable County's scientific review of the Massachusetts Esutaries Program Models will be put on hold while the National Academy of Science's study moves forward. The County will wait until summer before pursuing it any further. Data Base Map Review, Review of S Previous Scenarios and Initial Work on Developing 1 or 2 New Plan Scenarios 6