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Table ES-1. Existing total and sub-embayment nitrogen loads to the estuarine waters of the Waquoit Bay system, observed nitrogen <br /> concentrations, and sentinel system threshold nitrogen concentrations. Surface water loads to estuarine waters of the Waquoit <br /> Bay system are presented separately from the loads of the sub-embayments to which they discharge. <br /> Natural Present Present Present Present Direct Observed Threshold <br /> Present Net Present Net <br /> Background Land Use Septic WWTF Watershed Atmospheric e TN TN <br /> z a a a Benthic Total Load e <br /> Watershed Load System Load Load Deposition Conc. Conc. <br /> Sub-embayments . Load' Load Flux <br /> k /da k /da k /da k /da k /da k /da (kg/day) (kg/day) m /L m /L <br /> WAQUO/T BAY SYSTEM <br /> groundwater sources <br /> Waquoit Bay 0.422 0.690 1.397 0.000 2.088 11.956 -69.126 -55.082 0.39-0.47 0.38 <br /> Childs River-upper 0.485 2.090 9.929 0.000 12.019 0,455 -7.437 5.037 0.89-1.19 0.38 <br /> Eel Pond-east branch 0.085 0.482 1.688 0.000 2.170 1.011 26.004 29.185 0.47-0.53 - <br /> Eel Pond-south basin 0.016 0.066 0.458 0.000 0.523 0.663 -5.650 -4.464 0.40 - <br /> Eel Pond-west branch 0.707 3.789 12.548 0.000 16.337 0.890 -4.383 12.845 0.62-0.74 0.50 <br /> Quashnet River 0.523 0.868 1.904 0.000 2.773 0.252 11.996 15.020 0.63-0.79 - <br /> Hamblin Pond 0.268 0.953 3.427 0.000 4.381 1.529 7.890 13.799 0.52-0.59 - <br /> Little River 0.027 0.211 0.885 0.000 1.096 0.156 3.439 4.691 0.54 - <br /> Jehu Pond 0.140 1.025 2.888 0.000 3.912 0.674 9.854 14.440 0.58 - <br /> Great River 0.312 0.997 2.674 0.000 3.671 1.307 19.679 24.657 0.59 - <br /> Sa a Lot Pond 0.693 1.619 1.132 0.000 2.753 0.471 -3.086 0.139 - - <br /> surface water sources <br /> Childs River 0.978 2.485 8.134 0.003 10.622 - - 10.622 - - <br /> Quashnet River 4.222 9.641 10.504 0.362 20.507 - - 20.507 0.52 - <br /> Red Brook 0.449 1.438 6.575 0.000 8.014 - - 8.014 0.56 - <br /> Waquoit Bay System Total 9.329 24.917 57.567 0.365 90.866 19.364 -10.821 99.409 0.39-1.19 0.38-0.50 <br /> ' assumes entire watershed is forested(i.e., no anthropogenic sources) <br /> 2 composed of non-wastewater loads,e.g.fertilizer and runoff and natural surfaces and atmospheric deposition to lakes <br /> 3 existing attenuated wastewater treatment facility discharges to groundwater <br /> 4 composed of combined natural background,fertilizer, runoff, and septic system loadings(the sum of land use,septic,and WWTF loading) <br /> 5 atmospheric deposition to embayment surface only. Atmospheric loads to surface water inputs are included with their respective watershed load. <br /> 6 composed of natural background,fertilizer, runoff,septic system atmospheric deposition and benthic flux loadings <br /> 7 average of 2002-20010 data,ranges show the upper to lower regions(highest-lowest)of a sub-embayment. <br /> 8 Eel grass threshold for sentinel site located in Lewis Bay(0.38 mg/L),and infaunal targets at remaining stations. <br /> a Surface water discharge to Mill Creek,b Surface water discharge to Hyannis Inner Harbor. <br /> Executive Summary 12 <br />