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For the purposes of the study, AECOM used a target of 15 micrograms per liter. Ms. MacDougall <br /> shared a chart representing phosphorus loading by source, and when comparing the natural <br /> environmental background (before human development)to the current load,the current load measured <br /> 93% higher. Ms. MacDougall suggested that the internal loading was a result of historic loading such <br /> as watersheds and cranberry bogs. Should Mashpee choose to focus only on addressing internal <br /> loading, it would result in an average total phosphorus concentration of 17, which would not meet the <br /> target. Ms. MacDougall emphasized that the Town must look at all sources, internal and external, in <br /> order to meet the target of 15 micrograms per liter. <br /> Mr. Kretchmer emphasized that both the watershed sources and the internal load need to be addressed <br /> in order to meet the target. Mr. Kretchmer first highlighted best management practices for the <br /> watershed and shared photographs highlighting best and worst examples. <br /> Best Management Practices: <br /> Natural Woodland Buffers-A natural woodland buffer reduces erosion, absorbs many nutrients <br /> prior to reaching the water, provides habitat in lake and onshore, shades shallow water areas, <br /> enhances and improves property values, provides privacy <br /> Conservation Subdivisions-Keep development away from sensitive resources <br /> Open Space-Permanent protection of areas as conservation use or town purchase <br /> Economically Sound Landscape-Available resources <br /> Community Septic-Septic system for multiple homes re-located away from body of water <br /> Stormwater Retrofit-Use of riprap basin to catch sand and prevent nutrients from entering water <br /> source, requiring cleaning 2 times per year <br /> Public Education-Information to residents through signage or an information kiosk sharing best <br /> practices to improve the pond <br /> Detention/Retention Basins-Mitigation for phosphorus, holding water and allowing it to filtrate <br /> and attaching to soil particles to prevent phosphorus from entering the water <br /> Rain Gardens-Use in place of catch basins to allow road runoff to pond and slowly seep into <br /> ground rather than directly into the water <br /> Infiltration Trench& Swale-Water enters an interceptor trench, which then infiltrates the <br /> ground and reduces the phosphorus <br /> Pervious Pavement-Allows the runoff to flow through the pavement; recommended for the boat <br /> ramp that is currently gravel and eroding, grass can be planted depending upon amount of <br /> traffic <br /> Mr. Kretchmer also discussed specific watershed recommendations that will be highlighted in the final <br /> report. <br /> 4 <br />