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Appendix A-Three sample sub-watersheds <br /> HW selected and conducted a preliminary assessment of three sub-watersheds to Pleasant Bay <br /> for their different land use characteristics, including presence or absence of a golf course, and <br /> low or high density residential land uses. The goal was to develop subwatershed information <br /> that could potentially be used to evaluate specific management strategies, such as outreach and <br /> education. <br /> Since the model assumes no fertilizer applications to commercial properties,HW tried to identify <br /> sub-watersheds with limited commercial area. These sub-watersheds' individual nitrogen loads <br /> and their residential buildout potential are described below. These watersheds can be used as <br /> potential pilot watersheds for implementation of some of the recommended strategies. The MEP <br /> report describes the buildout analysis as based on zoning districts, including overlay districts <br /> (e.g.,water resource protection districts). Larger lots were subdivided by the minimum lot size <br /> to determine the total number of new lots and existing developed properties were reviewed for <br /> additional development potential(e.g., residential lots that are twice the minimum lot size,but <br /> have only one residence). <br /> Low density residential,no izolf course <br /> The Pochet Neck Stream sub-watershed in Orleans(identified as sub-watershed#56 in the MEP <br /> model)was selected as an example of low-density residential watershed with over 80%of the <br /> watershed covered by 64 residential parcels totaling almost 56 acres. The model estimates the <br /> nitrogen input from fertilizer in this sub-watershed at 71 lbs/year, exclusively from residential <br /> properties. This represents approximately 9%of the total nitrogen load for the watershed, <br /> estimated at 831 lbs. The model also estimates the development potential at 18 residential lots, <br /> or an additional input of 19 lbs/year. <br /> Higher density residential <br /> The Ryder Cove sub-watershed in Chatham(identified as sub-watershed#85 in the MEP model) <br /> was selected as an example of higher-density residential watershed with over half the watershed <br /> covered by 76 residential parcels totaling approximately 43 acres. The Chatham Harbor <br /> watershed most likely includes higher density residential areas,but it also includes commercial <br /> areas, and a small golf course. The model estimates the nitrogen input from residential fertilizer <br /> in this sub-watershed at 82 lbs/year. This represents less than 8%of the total nitrogen load for <br /> the watershed, estimated at 1,069 lbs. The model also estimates the development potential at 13 <br /> residential lots,or an additional input of 14 lbs/year. <br /> Predominantly golf course <br /> The Tar Kiln Stream sub-watershed in Brewster(identified as sub-watershed#63 in the MEP <br /> model)was selected as an example of a watershed with predominantly golf course land use,with <br /> only 12 residential parcels covering approximately 12 acres, and accounting for 6%of the <br /> watershed. The model estimates the nitrogen input from fertilizers in this sub-watershed are the <br /> following: 9.7 lbs/year from residential properties, and 2,822 lbs/year from the Captain's golf <br /> course. This represents over 90%of the total nitrogen load for the watershed, estimated at 3,113 <br /> lbs. The model also estimates the development potential at nine residential lots, or an additional <br /> input of 9.71bs/year. <br /> Pleasant Bay Fertilizer Management Plan A- 1 Horsley Witten Group,Inc. <br /> Final Report December 2010 <br />