20210209
10421200
1.0
FGDC
002
P90_Scores_2023
351126.755300
659946.088800
4769671.270900
5005567.392800
1
Projected
GCS_North_American_1983
Linear Unit: Meter (1.000000)
NAD_1983_UTM_Zone_19N
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<div style='text-align:Left;'><p style='margin-top:0px; margin-bottom:1.5rem; font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>The Department of Marine Resources (DMR) Bureau of Public Health collects surface water grab samples at approximately 1,200 water quality monitoring stations along the Maine coast year-round. Samples are processed in the lab via membrane filtration and enumerated for fecal coliform bacteria. Fecal coliform results are reported as the number of colony forming units (individual bacterium capable of forming colonies) per 100mL of water. DMR scientists analyze data from each station and calculate annual summary statistics using at least 30 of the most recent samples collected under a systematic-random sampling strategy. These values, along with sanitary surveys of the area, help determine whether the water quality is acceptable for harvesting molluscan shellfish.</p><p style='margin-top:0px; margin-bottom:1.5rem; font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>DMR's Shellfish Growing Area Classification Program classifies shellfish areas as Approved, Conditionally Approved, Restricted, Conditionally Restricted or Prohibited using standards set by the National Shellfish Sanitation Program (NSSP), a federal/state cooperative program that sets the requirements for all states involved in interstate shellfish harvest and sale. For more information about the classification of shellfish flats, visit https://www.maine.gov/dmr/fisheries/shellfish/shellfish-growing-area-classification.</p><p style='margin-top:0px; margin-bottom:1.5rem; font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>All classifications are based on two factors: the results of a shoreline survey that investigates the presence of pollution sources, and fecal coliform monitoring results. Two statistical values are calculated from the most recent 30 fecal coliform scores: the geometric mean (geomean) and the 90th percentile (P90). The standards for Approved classification are 14 CFU or less (geomean) and 31 CFU or less (P90). The standards for Restricted are 88 CFU or less (geomean) and 163 CFU or less (P90). The standards for Prohibited are greater than 88 CFU (geomean) and greater than 163 CFU (P90).</p><p style='margin-top:0px; margin-bottom:1.5rem; font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>End of year 2023 P90 data for all Maine active and investigative water quality stations based on the most recent 30 samples. Conditional Area stations are based on last 30 samples in the open status. Data projection is NAD 1983 UTM Zone 19N.</p></div>
P90_Scores_2023
2024-05-15T00:00:00
Western Region Growing Area Supervisor
Maine Department of Marine Resources
194 McKown Point Rd, PO Box 8
West Boothbay Harbor
Maine
04575
US
207-633-9500
Monday through Friday 8am to 5pm
Bureau of Public Health Staff
Maine Department of Marine Resources
Marine Resource Scientist I
194 McKown Point Rd, PO Box 8
West Boothbay Harbor
Maine
04575
US
207-633-9500
Monday through Friday 8am to 5pm
Active water quality stations are located within the coastal region throughout the state (from the Maine/New Hampshire border to the Maine/Canadian border). There are 1331 active stations throughout the state as of December 31, 20xx.
2016-01-01T00:00:00
2016-12-31T00:00:00
-70.833198
-66.967458
45.107481
43.062891
-70.895093
-66.964041
45.203593
43.062891
1
Maine Department of Marine Resources
Marine Resource Scientist I
194 McKown Point Rd, PO Box 8
West Boothbay Harbor
Maine
04575
US
207-633-9500
Monday through Friday 8am to 5pm
Bureau of Public Health Staff
Benjamin Wahle, Maine Department of Marine Resources Bureau of Public Health & Aquaculture
P90Maine NSSPMaine DMRWater Qualityshellfishspatialopen data
Shellfish
P90
NSSP
Geometric mean and 90th percentile of fecal coliform bacterial monitoring data for active and investigative water quality stations based on last 30 samples inclusive to December 31, 2023.
Maine Department of Marine Resources, Bureau of Public Health & Aquaculture
<div style='text-align:Left;'><p style='margin-top:0px; margin-bottom:1.5rem; font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>Not to be used to determine current shellfish harvest areas in Maine. Data valid through the end of year 2023.</p><p style='margin-top:0px; margin-bottom:1.5rem; font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>To download P90 and other publicly available data from the DMR Bureau of Public Health, please visit https://dmr-maine.opendata.arcgis.com/ and enter the terms "P90" or NSSP" in the search bar.</p><p style='margin-top:0px; margin-bottom:1.5rem; font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>For questions regarding DMR Bureau of Public Health spatial data, please email benjamin.wahle@maine.gov.</p></div>
Esri ArcGIS 12.9.7.32739
Bureau of Public Health Staff
Maine Department of Marine Resources
Marine Resource Scientist I
194 McKown Point Rd, PO Box 8
West Boothbay Harbor
Maine
04575
US
207-633-9500
Monday through Friday 8am to 5pm
False
Bureau of Public Health Staff
dataset
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20240412
Bureau of Public Health Staff
Maine Department of Marine Resources
Marine Resource Scientist I
194 McKown Point Rd, PO Box 8
West Boothbay Harbor
Maine
04575
US
207-633-9500
Monday through Friday 8am to 5pm
Bureau of Public Health Staff
1
ArcGIS 10.4.1
File Geodatabase Feature Class
EPSG
6.11(3.0.1)
Bureau of Public Health Staff
Maine Department of Marine Resources
Marine Resource Scientist I
194 McKown Point Rd, PO Box 8
West Boothbay Harbor
Maine
04575
US
207-633-9500
Monday through Friday 8am to 5pm
Bureau of Public Health Staff
P90_Scores_2023
Feature classes are homogeneous collections of common features, each having the same spatial representation, such as points, lines, or polygons, and a common set of attribute columns, for example, a line feature class for representing road centerlines.
ESRI
Feature Class
0
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Station
Station
String
254
0
0
Location ID where samples are collected.
DMR
Class
Class
String
254
0
0
NSSP Classification of area based on sanitary suitability for shellfish harvesting.
DMR
Count
Count
Double
8
0
0
Total number of samples used in calculations
DMR
GM
GM
Double
8
0
0
Geometric Mean. The geometric mean, or geomean, is a type of averaging calculation. Unlike a simple average or arithmetic mean, the geomean takes into account the way bacteria grow. During bacterial growth, each bacterium doubles and reproduces itself i.e. one bacterium becomes two, two bacteria become four, four become eight, and so on. There are low values at first and the rate of growth increases as the number of colonies increases. This is called exponential growth. This growth pattern means a fecal coliform dataset may have a few high scores and many low scores. The calculation for the geometric mean takes exponential growth into account by transforming the data into logarithms, taking the mean and then converting the number back to a log base 10 number. For example, the arithmetic mean of a fecal coliform score of 300, 150, 23 and 2 CFU/100ml is 119 CFU/100ml. Calculating the geomean, the result is 38 CFU/100ml.
DMR/NSSP
SDV
SDV
Double
8
0
0
Standard Deviation
DMR
MAX
MAX
Double
8
0
0
The highest score within the sample set used for calculations
DMR
P90
P90
Double
8
0
0
The 90th percentile (P90) is the variability standard, meaning this value takes into account the variability of test readings. In any test measurement, successive readings of the same sample would produce slightly different scores each time due to precision of the equipment, human error, etc. This type of variability is a factor of the test method and equipment used and is true of all testing methods.
To account for the variability in the fecal coliform test, a standard has been established. Here again, since bacteria grows exponentially, the calculations are performed on a logarithmic scale. The P90 is based on the distribution of fecal coliform scores and means that 90% of scores are at/or below the P90 and 10% scores are above. As long as most of the other scores are low, a few high scores will not have a large impact on the P90 value. The P90 standard is the acknowledgment by the NSSP that a few high scores in data set may be due to the variability of the test method. If the area shows high fecal coliform scores intermittently due to pollution events such as rainfall, this may cause water quality to exceed the P90 standards because the shellfish are intermittently subject to polluted waters.
DMR/NSSP
Appd_Std
Appd_Std
Double
8
0
0
Approved P90 Standard (31 CFU/100mL)
DMR/NSSP
Restr_Std
Restr_Std
Double
8
0
0
Restricted P90 Standard (163 CFU/100mL)
DMR/NSSP
Min_Date
Min_Date
Date
8
0
0
Minimum Date - oldest date included in the sample set for P90 and GM calculations
DMR
Lat_DD
Lat_DD
Double
8
0
0
Latitude in Decimal Degrees
DMR
Long_DD
Long_DD
Double
8
0
0
Longitude in Decimal Degrees
Grow_Area
Grow_Area
String
5
0
0
Growing Area in which the station is located.
DMR
Shape
Shape
Geometry
0
0
0
Feature geometry.
Esri
Coordinates defining the features.
0
ArcGIS Metadata
1.0
Simple
FALSE
0
TRUE
FALSE