Metadata for Monthly Sampling and Analyses

Monthly sampling is conducted at low tide at the mid-Great Bay, and the Squamscott Railroad Bridge sites, and at high and low tides at the Adams Point, Lamprey River-Town Landing , Squamscott River-Chapman’s Landing and at the the Fort Point Pier. Replicate subsurface grab water samples are collected in one-liter, acid-washed polyethylene bottles following UNH JEL SOP 1.05 (Langan 1992a), processed and analyzed for total suspended solids, particulate organic matter, chlorophyll a and phaeopigments following UNH JEL SOP 1.06 (Langan 1992b). Measurements of temperature, salinity, dissolved oxygen, and % oxygen saturation are taken at the time of sampling using a YSI Model 85 multi meter.

In addition to the monthly sampling at low (and high) tide at the sites described above, diel sampling is conducted once monthly over a full lunar cycle (24hr: 48min) at the in-situ sonde location in the Oyster river using an SIGMA autosampler. The sampler is programmed to collect replicate samples at 2.5-hour intervals (10 samples x 2 replicates).

The filtrate is analyzed for NO2-, NO3-, NH4+, and orthophosphate on a LACHAT nutrient autoanalyzer. Samples taken after June 2002 will also be analyzed for silicate on the same instrument.

Data contained in the files and on the graphs are a daily average of the four samples (2 replicates x 2 tides) for the Adams Point, Squamscott-Chapman’s Landing, Lamprey- Town landing, and Fort Point sites, and two samples (2 replicates at low tide) for the mid Great Bay and Squamscott River-Railroad Bridge sites.

Langan, R. 1992a. UNH JEL Standard operating procedure for water sampling for suspended solids, chlorophyll, and nutrients. JEL SOP 1.05. In: Standard operating procedures and field methods used for conducting ecological risk assessment case studies. Mueller et al. eds. 1992. USEPA, US Navy (NRaD) Technical Document 2296.

Langan, R. 1992b. UNH JEL Standard operating procedure for water sample filtration and analysis of total suspended solids, chlorophyll and phaeopigments. JEL SOP 1.06. In: Standard operating procedures and field methods used for conducting ecological risk assessment case studies. Mueller et al. eds. 1992. USEPA, US Navy (NRaD) Technical Document 2296.

Contacts:

Richard Langan, Ph.D. rlangan@cisunix.unh.edu
Jonathan Pennock, Ph.D. Jonathan.Pennock@unh.edu
Jaimie Wolf jswolf@cisunix.unh.edu