10/18/2011 SEWER COMMISSION Minutes

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u planning area, but did not include the Town of Sandwich. However, it was understood that the Town of Sandwich would be included in any alternative. These layouts were then used to create two(2)Options(Nos. 1 and 2)that were presented to the Sewer Commission in the Spring of 2011. Based on these two options for addressing nitrogen within the project planning area,the Sewer Commission offered several suggestions.These were considered and the options were transformed into Option I and Option 1 B,as described in subsequent sections. The general comments from the Sewer Commission relative to these initial two options helped form Options I and 1 B,and were as follows: • Use of Rock Landing—consider one option of relocating the wells from that location and a second alternative where Rock Landing site was not available. • Maximize use of New Seabury Golf Course(under one scenario,the other should focus on it not being available). • Maximize use of Willowbend Golf Course. • Sewer Popponesset Island under all options. • Possible pilot project within the Pirates Cove neighborhood using NitrexTM technology or permeable reactive barrier(PRB)technologies. • Look at options of Falmouth,Barnstable,and Sandwich dealing with their nitrogen loads outside of the watershed.However,in subsequent meetings the Sewer Commission requested a second look at the portion of Falmouth east of the Quashnet/Moonakiss River in Mashpee (as originally presented to the committee),therefore this will be included in both alternatives. • Sensitivity analysis of improved attenuation'south of Santuit Ponds and Quashnet Bogs, and possibly through Willowbend. • Improve all small WWTF's to 3 mg/L. Initially, the approach by GHD was to only consider improvements to larger facilities as it would likely be more cost effective in the short term relative to the amount of nitrogen load discharged by these smaller facilities. • 1(A systems for now will continue to be considered at 19 mg/L,however,higher performances can be achieved(as 10 mg/L was used initially),but this approach of 19 mg1L remains consistent with the MassDEP approval process for these systems. Additional assumptions by GHD'used in the analysis: • Sites being considered(outside of existing W WTF discharge sites)include: o Site 2(Ashumet)for treatment only o Site 4(Transfer Station)for treatment and discharge o Site 6(Keefer)for treatment and discharge o Backroads site for treatment and discharge o Site 7(New Seabury)for discharge 2