Tara Franey – Page 2

November 14, 2024

Phytoplankton samples were collected on November 14, 2024 at Bullock Reach and analyzed in the laboratory shortly after collection.

It was partly sunny, windy and cold on this day. Sonde data was not recorded.

The qualitative tow net sample had a quick filtration time and the filtrate contained some light brown particulates and plant matter.

The analysis of the quantitative whole water sample revealed a total of 288,000 cells/L. The microflagellates were found at 30,000 cells/L. The most predominant phytoplankton genera were Chaetoceros spp. at 34,000 cells/L, Leptocylindrus spp. at 76,000 cells/L, and Heterocapsa spp. at 26,000 cells/L.

200x phase contrast micrograph of *Staurastrum* spp.

Staurastrum, shown here in a 200x phase contrast micrograph, is a large genus of microscopic green algae which are closely related to land plants. They are found in freshwater habitats around the world and live primarily in acidic lakes, ponds and swamps with low nutrient levels. Many Staurastrum species serve as indicators of eutrophic conditions.

February 19, 2025

Nutrient samples were collected from six river stations on February 19^th. No samples were collected from bay stations due to adverse weather conditions. In the five days prior to sampling, 1.98 inches of precipitation were recorded at T.F. Green.

The highest total nitrogen (TN), total dissolved nitrogen (TDN) and dissolved inorganic nitrogen (DIN) concentrations were observed at Blackstone River @ Slater Mill (TN = 1,810 ppb, TDN = 1,960 ppb, DIN = 1,533 ppb). The lowest TN, TDN and DIN concentrations were observed at Woonasquatucket River @ Manton Ave. Bridge (TN =625 ppb, TDN = 711 ppb, DIN = 480 ppb).

The next scheduled sampling date is March 5, 2025.

February 5, 2025

Nutrient samples were collected from twelve river stations on February 5^th. No samples were collected from bay stations due to adverse weather conditions. In the five days prior to sampling, 0.74 inches of precipitation were recorded at T.F. Green.

The highest total nitrogen (TN), total dissolved nitrogen (TDN) and dissolved inorganic nitrogen (DIN) concentrations were observed at Ten Mile River @ Central Ave. (TN = 3,160 ppb, TDN = 3,890 ppb, DIN = 3,148 ppb). The lowest TN, TDN and DIN concentrations were observed at Coles River @ Milford Rd. (TN =663 ppb, TDN = 727 ppb, DIN = 289 ppb).

The next scheduled sampling date is February 19, 2025.

October 30, 2024

Water column profiles were conducted at seven locations in the Providence and Seekonk River estuaries on October 30, 2024 using a Seabird Electronics profiler. In the five days leading up to the survey, no precipitation was recorded at T.F. Green. Water column stratification varied between the sites this week from well-mixed at most sites to weakly stratified at Phillipsdale Landing.

Dissolved oxygen (DO) conditions were not observed to be below the hypoxia threshold (2.9 mg/L) at any site profiled this week. The highest fluorescence recorded this week was measured around 1 meter below the surface at Phillipsdale Landing.

October 23, 2024

Water column profiles were conducted at six locations in the Providence River estuary on October 23, 2024 using a Seabird Electronics profiler. A seventh site, Point Street Bridge, was visited, but no data was collected due to an equipment malfunction. In the five days leading up to the survey, no precipitation was recorded at T.F. Green. Water column stratification varied between the sites this week from well-mixed at Pawtuxet Cove to moderately stratified at India Point Park.

January 22, 2025

Nutrient samples were collected from six river stations on January 22^th. No samples were collected from bay stations due to adverse weather conditions. In the five days prior to sampling, 0.79 inches of precipitation were recorded at T.F. Green.

The highest total nitrogen (TN), total dissolved nitrogen (TDN) and dissolved inorganic nitrogen (DIN) concentrations were observed at Pawtuxet River @ Broad St. (TN = 1,920 ppb, TDN = 2,110 ppb, DIN = 1,734 ppb). The lowest TN and DIN concentrations were observed at Moshassuck River @ Footbridge at Mill St. (TN =777 ppb, DIN = 657 ppb). The lowest TDN concentration was observed at Woonasquatucket River @ Manton Ave. Bridge (896 ppb).

The next scheduled sampling date is February 5, 2025.

January 8, 2025

Nutrient samples were collected from eleven river stations on January 8^th. No samples were collected from bay stations due to adverse weather conditions. In the five days prior to sampling, trace amounts of precipitation were recorded at T.F. Green.

The highest total nitrogen (TN), total dissolved nitrogen (TDN) and dissolved inorganic nitrogen (DIN) concentrations were observed at Ten Mile River @ Central Ave. (TN = 2,760 ppb, TDN = 2,970 ppb, DIN = 2,729 ppb – averages of duplicates). The lowest TN, TDN and DIN concentrations were observed at Coles River @ Milford Rd. (TN = 641 ppb, TDN = 650 ppb, DIN = 209 ppb).

The next scheduled sampling date is January 22, 2025.

December 24, 2024

Nutrient samples were collected from seven river stations on December 24^th. No samples were collected from bay stations due to adverse weather conditions. In the five days prior to sampling, 0.28 inches of precipitation were recorded at T.F. Green.

The highest total nitrogen (TN) and total dissolved nitrogen (TDN) were observed at Blackstone River @ Stateline (TN = 1,290 ppb, TDN = 1,360 ppb). The highest dissolved inorganic nitrogen (DIN) concentration was observed at Pawtuxet River @ Broad St. (964 ppb). The lowest TN, TDN and DIN concentrations were observed at Woonasquatucket River @ Manton Ave. Bridge (TN = 655 ppb, TDN = 670 ppb, DIN = 397 ppb).

The next scheduled sampling date is January 8, 2025.

December 11, 2024

Nutrient samples were collected from twelve river stations on December 11^th. No samples were collected from bay stations due to adverse weather conditions. In the five days prior to sampling, 0.38 inches of precipitation were recorded at T.F. Green.

The highest total nitrogen (TN), total dissolved nitrogen (TDN) and dissolved inorganic nitrogen (DIN) concentrations were observed at Ten Mile River @ Central Ave. (TN = 3,295 ppb, TDN = 3,430 ppb, DIN = 2,960 ppb – averages of duplicates). The lowest TN and DIN concentrations were observed at Coles River @ Milford Rd. (TN = 648 ppb, DIN = 103 ppb). The lowest TDN was observed at Moshassuck River @ Footbridge at Mill St. (560 ppb).

The next scheduled sampling date is December 24, 2024.

November 27, 2024

Nutrient samples were collected from seven river stations on November 27^th. No samples were collected from bay stations due to adverse weather conditions. In the five days prior to sampling, 0.75 inches of precipitation were recorded at T.F. Green.

The highest total nitrogen (TN), total dissolved nitrogen (TDN) and dissolved inorganic nitrogen (DIN) concentrations were observed at Pawtuxet River @ Broad St. (TN = 1,670 ppb, TDN = 1,660 ppb, DIN = 1,275 ppb). The lowest TN, TDN, and DIN concentrations were observed at Moshassuck River @ Footbridge at Mill St. (TN = 641 ppb, TDN = 721 ppb, DIN = 468 ppb.

The next scheduled sampling date is December 11, 2024.