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Popponesset Bay TN: Long-Term vs 2010 -2016 <br /> im LongTerm mean t:i2010.2012 s 2013-2015 m 2016 <br /> 1.5 � <br /> 1.0 <br /> Threshold <br /> 0.38 mglL <br /> 0.5 r <br /> P <br /> _ k tfna •rets C rtl• tlY <br /> 0.0 11IYY' ~ f <br /> ` ,a �`0 0ma �'0 oma ��� c�``a G� •�� '. <br /> 0 5� 5 CO":r pu Qtr �� <br /> Figure 11. Distribution of Total Nitrogen within the Popponesset Bay Estuarine System. Nitrogen enters through groundwater <br /> inflows all along the shoreline,with additional"point"loads from the upper regions of the watershed via the Mashpee <br /> River and Santuit River to Shoestring Bay, These nitrogen loads plus recycling within the estuary mix with the low <br /> nitrogen waters of Nantucket Sound entering through the single tidal inlet to create the observed gradient.M.R.-Maslipee <br /> River,SB-Shoestring Bay,Ock-Ockway Bay,PB-Popponesset Bay,PCrk-Poppenesset Creek,Pinq-Pinquickset <br /> Cove. The red line shows the offshore TN concentration(0.28 mg/L); "Threshold"is the TMDL target for restoration. <br /> TN levels in 2010-2015 are compared to the long-term average. <br /> 29 <br />