1/17/2013 SEWER COMMISSION Minutes

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I ton of nitrogen which required removal and featured a sandy shoreline_ Mr- York confirmed that Dick Cook had an existing oyster farm in ockway Bay, and although expansion would help, it would not be included in the plan. .fir. York added that the Tribe had grant in Popponesset ' Bay which also had a very low nitrogen removal figure and could potentially be another candidate for quahog and oyster propagation. Permeable Reactive Barrier-The Chair noted that the PRB had previously been recommended ed for the Pirates Cove area. Mr.Klenert suggested that the topography for the area would make installation very challenging. The Chair suggested the possibility of locating it on the beach. Mr- Gurnee expressed concern about not knowing when it would require replacement. It was unknown what other locations would be candidates for PRB and the Chair suggested the possibility of asking Mr. Lombardo about other locations. Mr. Lyons suggested that more technical information was necessary as well as information regarding other specific locations. Chairman Fudala stated that Falmouth would be conducting a study regarding the use ofPRs in a few locations. Cluster Systems-The Chair stated that cluster systems may be an option for areas isolated from the rest of Mashpeer treatment facilities. Mr. Gurnee expressed concern regarding the costs associated with the systems, such as collection, and cost comparisons to a lamer system. W. Gregg noted that meeting T ML at 3 mg L would rewire more intensive operations compared to meeting 10 mg/L and permit requirements would be different. Mr. Gregg added that each system could perform differently and would require close monitoring to meet the TMDLs. There was discussion regarding the costs of cluster systems and force main and Mr. Gregg suggested that the collection system costs would generally be the same due to the trade-off of the treatment process and pumping. Mr. Gregg stated that he would like to know locations for cluster treatment processes, with a nearby collection system and discharge in a good watershed to avoid transporting it to another location for treatment. There was discussion about isolated areas in M shpee where cluster systems may make sense, such as S ntuit Pond Estates or Beechwood Point. flake Johnson, of orenco Systems, offered to forward information to the Sewer Commission from the water Environment Federation, who studied and compared costs of collection systems. Mr. Gurnee inquired about the next step and Mr. Lyons suggested that an engineer would be needed to make recommendations for chaster system locations. Chairman Pudala pointed out that Scenario 5 incorporated cluster systems but that discharge locations did not make sense_ The Chair will provide a reap to Mr. Gregg showing the locations. Mr. Gregg inquired about the level of treatment being sought for Nitrex cluster systems and the Chair i responded that he would expect 3.5,though further assessment would be needed to consider an existing system located nearby. fir. Gregg stated that the information would be critical to the scenario runs. There was discussion regarding Nitrex systems, their monitoring and bowing the anticipated loads. There was also discussion regarding the impacts of seasonal use and the various technologies available. Use of Existing Waste water Treatment Facilities-Mr. Santos pointed out that New 4 Seal ury may already have pipes in place and there could be interest in land credits. Mr. Gregg discussed looking at data for facilities, noting that it was necessary to consider a system operating close to its design point. The Chair pointed out that all plants were oversized due to DEP regulations. Mr. Gregg also stated that there was concern whether or not the Mate's permit 3