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Sediment concentrations
of chromium in the Great Bay Estuary. Data presented in this map was developed
from a compilation of historical data from numerous sources and catalogued
in the USGS contaminated Sediment Database. This map has been published
in the Technical Characterization of Estuarine and Coastal New Hampshire
and specific references are included in the document text and bibliography.
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Sediment concentrations
of lead in the Great Bay Estuary. Data presented in this map was developed
from a compilation of historical data from numerous sources and catalogued
in the USGS contaminated Sediment Database. This map has been published
in the Technical Characterization of Estuarine and Coastal New Hampshire
and specific references are included in the document text and bibliography.
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Sediment concentrations
of mercury in the Great Bay Estuary. Data presented in this map was developed
from a compilation of historical data from numerous sources and catalogued
in the USGS contaminated Sediment Database. This map has been published
in the Technical Characterization of Estuarine and Coastal New Hampshire
and specific references are included in the document text and bibliography.
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Sediment concentrations
of PCB’s in Portsmouth Harbor and Rye Harbor, NH. This map, which
has been published in the Technical Characterization of Estuarine and
Coastal New Hampshire was developed from data collected for the US
Navy/USEPA/ UNH Risk Assessment Study for the Portsmouth Naval Shipyard
(Johnson et al. 1994). |
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Current shellfish water
classification of the Hampton Harbor Estuary. Classification is determined
by applying National Shellfish Sanitation Program (NSSP) guidelines that
require a long-term database (minimum 30 samples) of concentrations of
fecal coliform bacteria and comprehensive sanitary surveys. Categories
are as follows: Approved (geometric mean< 14 fc/100 ml), Restricted
(geometric mean <80 fc/100 ml) and Prohibited (geometric mean >80
fc/100 ml). Conditional status can apply to "Approved" and "Restricted"
areas and can be based on seasonal, meteorological or pollution source
related changes in water quality. Areas that have not been properly classified
are subjected to administrative closure. Data was collected, and analyzed
by the NH Department of Health and Human Services, Division of Public
Health Services (DPHS). |
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Changes in shellfish water
classification in Hampton Harbor 1975-1998. These maps represent the changes
in classification of shellfish growing waters in Hampton Harbor, NH. Though
they appear to indicate a drastic decline in water quality from 1975 to
1990, followed by a subsequent improvement in 1998, they actually represent
an administrative closure by forced on NH DPHS by USFDA which has oversight
of the NSSP. Sanitary surveys conducted in 1994 and 1998 resulted in the
conditional opening of some clamflats in the harbor. |
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Current shellfish water
classification in parts of the Great Bay Estuary, NH. Classification is
determined by applying National Shellfish Sanitation Program (NSSP) guidelines
that require a long-term database (minimum 30 samples) of concentrations
of fecal coliform bacteria and comprehensive sanitary surveys. Categories
are as follows: Approved (geometric mean< 14 fc/100 ml), Restricted
(geometric mean <80 fc/100 ml) and Prohibited (geometric mean >80
fc/100 ml). Conditional status can apply to "Approved" and "Restricted"
areas and can be based on seasonal, meteorological or pollution source
related changes in water quality. Areas that have not been properly classified
are subjected to administrative closure. Data was collected, and analyzed
by the NH Department of Health and Human Services, Division of Public
Health Services (DPHS). |
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Changes in shellfish water
classification in sections of the Great Bay Estuary. These maps, which
are based on NH DPHS and NH Department of Environmental Services (NH DES),
indicate improved water quality and an increasingly comprehensive shellfish
waters monitoring program from 1960 to 1998.
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Sources and quantity of
total nitrogen loading to the Great Bay Estuary. This pie chart which
was developed by Richard Langan for the New Hampshire Estuaries Project,
is based on data collected in numerous studies conducted between 1990
and 1998 by Langan and others. This graphic has been published in the
Technical Characterization of Estuarine and Coastal New Hampshire, references
to the specific studies that generated the data are cited in that document.
The category "NPS" stands for non-point sources and includes
all natural and anthropogenic riverine and overland flow loadings. Groundwater
loadings have not been quantified and are therefore not included. |
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Annual loadings of total
nitrogen (tons per year) for the wastewater treatment plants (WWTP’)
discharging directly and indirectly to the Great Bay Estuary. This data
generated for and published in the NHEP the Technical Characterization
of Estuarine and Coastal New Hampshire was developed by Richard Langan
from WWTP discharge data and concentrations of total nitrogen from discrete
samples collected at the treatment plants. Specific studies and reports
are cited in the "Technical Characterization" document. |
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Monthly loading of total
nitrogen to the Great Bay Estuary from fluvial (riverine) sources. This
graphic, which was developed by Richard Langan for the NHEP Technical
Characterization of Estuarine and Coastal New Hampshire, is based
on three years of nitrogen data collected from 1993 to 1996, river discharge
data generated by USGS gauging stations, and a river discharge model developed
by a UNH graduate student in 1997. Specific studies and reports used to
generate this graphic are cited in the "Technical Characterization"
document. |
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Annual loading of total
nitrogen to the Great Bay Estuary from fluvial (riverine) sources. This
graphic, which was developed by Richard Langan for the NHEP Technical
Characterization of Estuarine and Coastal New Hampshire, is based
on three years of nitrogen data collected from 1993 to 1996, river discharge
data generated by USGS gauging stations, and a river discharge model developed
by a UNH graduate student in 1997. Specific studies and reports used to
generate this graphic are cited in the "Technical Characterization"
document. |
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A comparison of dissolved
inorganic nitrogen concentrations (DIN= Nitrate+Nitrite+Ammonium) for
the periods 1974-1981 and 1988-1996. This graphic which was developed
by Richard Langan for the NHEP Technical Characterization of Estuarine
and Coastal New Hampshire, is based on data collected by Loder et
al. for the earlier period, and Langan and Jones for the later period.
. Specific studies and reports used to generate this graphic are cited
in the "Technical Characterization" document. |
