Watershed Below TMDL Threshold At TMDL Threshold Above TMDL - PowerPoint PPT Presentation

Nantucket Harbor Watershed

Below TMDL Threshold At TMDL Threshold Above TMDL Threshold

Water Quality Overview  Routine monitoring: June-September.  Water quality, dissolved oxygen, algae, eelgrass.  Work with State agencies to ensure healthy swimmable, fishable waters. Very High Low High Nitrogen : Nitrogen : Nitrogen : Goa oal 6 ye 6 year ar Average 2017 2017

Nantucket Harbor Sentinel 0.500 0.450 Dissolved Oxygen- Acceptable. 0.400 0.350 Algae Biomass- Acceptable. Total Nitrogen (mg/L) 0.300 Harmful Algae Presence - Pseudo -nitzschia 0.250 elevated in March, July, August, September. Red 0.200 tide species present. Rust tide present at low 0.150 levels April, September; Wauwinet elevated in August. Phaeocystis bloom in February-April. 0.100 0.050 August Scup Fishkill in Creeks. 0.000 Historic 2010 2012 2013 2014 2015 2016 2017 Head of Harbor Quaise Lower Harbor Ocean Threshold 2010-2017 are full summertime averages from MEP tech memo.

Polpis Harbor 0.500 Sentinel 0.450 Dissolved Oxygen- Acceptable. 0.400 0.350 Algae Biomass- Elevated in August. 0.300 Axis Title Harmful Algae Presence - Red tide species in May, 0.250 June, August. Rust tide elevated August. 0.200 0.150 0.100 0.050 0.000 Historic 2010 2012 2013 2014 2015 2016 2017 Average Ocean Threshold 2010-2017 are full summertime averages from MEP tech memo

Madaket & Hither Creek Sentinel 0.7 Dissolved Oxygen- Harbor acceptable, Hither 0.6 Creek periodic oxygen below healthy threshold. 0.5 Algae Biomass- Harbor acceptable, Hither Creek- June, July, August above healthy threshold. 0.4 Axis Title Harmful Algae Presence - Red tide species 0.3 elevated in August. 0.2 0.1 0 Historic 2010 2012 2013 2014 2015 2016 2017 Hither Creek Sentinel Harbor Average Eel Point Threshold 2010-2017 are full summertime averages from MEP tech memo.

NLC and DPW Stormwater Sampli ling Program

St Stormwater Capital Im Improvements Best Management Practices (BMP’s)

TON/DPW Stormwater Im Improvement Strategy • Stormwater drainage and outfall mapping • Monitoring and maintenance plan for stormwater drainage elements • Stormwater capital improvements (BMP’s) • Develop enforceable stormwater policies (regulate illicit discharge, construction site management, post-construction stormwater control) • Stormwater pipe condition assessment (CCTV) • Stormwater sampling program with NLC in harbor watershed (storm event and dry weather sampling)

NLC Eelg lgrass Health Assessment and Stable Is Isotope Analysis

NLC Eelgrass Restoration Project Monomoy Beach Transplant Site 2012 Monomoy Beach Transplant Site 2018

Fulling Mill March 2012

Fulling Mill February 2018

Monomoy March 2012

Monomoy February 2018

European Green Crab Research in in Nantucket Harbor