Harwich Marine Total Nitrogen Ave mgL 1 4

Harwich Marine Total Nitrogen (Ave) mg/L 1. 4 MEP Total Nitrogen Threshold (0. 5 mg/L) for benthic organisms; TN above this threshold exceeds the level for healthy benthic organisms 1. 2 1 0. 8 0. 6 0. 4 0. 2 0 Allen's Hulse Point Allen's Harbor Creek Allen Marina Herring Bridge Herring LC Bridge Herring Lothrop Herring North Herring Resevoir Wychmere Harbor Outer Harbor Muddy Creek Lower

Harwich Marine Chlorophyll (Ave) mg/L 30 25 Chl A is a measure of phytoplankton (algae); levels above 5 ug/L indicate negative impact 20 15 10 5 0 Allen's Hulse Point Allen's Harbor Creek Allen Marina Herring Bridge Herring LC Bridge Herring Lothrop Herring North Herring Wychmere Resevoir Harbor Outer Harbor Muddy Creek Lower

Harwich. Dissoved Oxygen (Ave) mg/L 8 7 Class SA Waters Criteria 6 5 Aquatic organisms are under stress when DO is between 6 - 3 mg/L. The lower the concentration the greater the stress. 4 3 Levels at 3 mg/L and below indicate not enough oxygen plants/animals exist in extremely stressful conditions; result in die-off and relocation of some species 2 1 0 Allen's Hulse Point Allen's Harbor Creek Allen Marina Herring Bridge Herring LC Bridge Herring Lothrop Herring North Herring Resevoir Wychmere Harbor Outer Harbor Muddy Creek Lower