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Layer: PhosphorusStations (ID:0)

View In:   Map Viewer

Name: PhosphorusStations

Display Field: OrganizationFormalName

Type: Feature Layer

Geometry Type: esriGeometryPoint

Is View: true

Is Updatable View: true

Source Schema Changes Allowed: true

Sources

Description: <p style="margin-top:0px; margin-bottom:1.5rem; font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;"><font size="4" style="font-family:inherit;">The &quot;National Observed Phosphorus Data - WQP&quot; view in the Freshwater Explorer is based on measured data obtained from the </font><a href="https://www.waterqualitydata.us/" style="color:rgb(0, 121, 193); text-decoration-line:none; font-family:inherit;" target="_blank"><font size="4" style="font-family:inherit;">U.S. EPA Water Quality Portal (WQP)</font></a><font size="4" style="font-family:inherit;"> data inventory - the nation's largest source for water quality monitoring data. Data were downloaded from the WQP website using the following query criteria: </font><br /></p><p style="margin-top:0px; margin-bottom:0px; font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;"></p><ul><li><font size="4" style="font-family:inherit;">Country - United States.</font></li><li><font size="4" style="font-family:inherit;">Sample Media - Water. </font></li><li><font size="4" style="font-family:inherit;">Characteristics - Total Phosphorus, Phosphorus, Orthophosphate, Hydrolyzable Phosphorus</font></li><li><font size="4" style="font-family:inherit;">Date range - 1 January 2000 to 01 December 2020.</font></li></ul><p style="margin-top:0px; margin-bottom:0px; font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;"></p><p style="margin-top:0px; margin-bottom:1.5rem; font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;"><font size="4" style="font-family:inherit;">These water quality data records are provided by many federal, state and tribal organizations and other partners. As such, the U.S. EPA cannot ensure that the information is accurate, current or complete. Therefore, users should verify the data from the original sources before drawing site specific conclusions. Examples of errors found include negative phosphorus values, units of measurements not consistent with phosphorus measurements (e.g., ppb, ppm, umol) and entries as mg/L but reported as µg/L. The U.S. EPA plans to update data and add new data; however, due to the large number of organizations involved, such an effort is beyond the scope of this story map. Users should verify the data from the original sources before drawing site specific conclusions.</font></p><div style="font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;"><font size="4" style="font-family:inherit;"><br /></font></div><div style="font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;"><p style="margin-top:0px; margin-bottom:0.0001pt; text-align:justify;"><font size="4" style="font-family:inherit;">An inventory of the phosphorus data affected by such uncertainties has been compiled and a thorough data revision process has been planned to contact the individual organizations that provided the data and to regularly up-date data. However, due to the large number of organizations involved, it is necessary that users of the National Phosphorus Data assume there will be some inherent measuring and reporting error. </font></p><p style="margin-top:0px; margin-bottom:0.0001pt; text-align:justify;"><font size="4" style="font-family:inherit;"><br /></font></p><p style="margin-top:0px; margin-bottom:0.0001pt;"><font size="4" style="font-family:inherit;">The quality of the measured data was evaluated as follows.  An automated Quality Assurance/Quality Control (QA/QC) protocol was developed using R-scripts to remove or identify potentially erroneous phosphorus values (outliers) in WQP. The objective of the QA/QC protocol was to:</font></p><ul><li><font size="4" style="font-family:inherit;"><b>Review the geographic/temporal scope</b> and data types of the acquired data to the project objectives<br /></font></li><li><font size="4" style="font-family:inherit;"><b>Check for duplicate entries</b>. Identify and screen those samples that are duplicates. Check for samples or results that do not have stations.</font></li><li><font size="4" style="font-family:inherit;"><b>Interpret data qualifiers and comments</b> (spiked, blanks, duplicates, etc.)</font></li><li><font size="4" style="font-family:inherit;"><b>Check each field for inconsistencies</b>. Screen undesired components.</font></li><li><font size="4" style="font-family:inherit;"><b>Add user-specified fields</b> to interpret, standardize, and clean up existing fields.</font></li><li><font size="4" style="font-family:inherit;"><b>Data Qualifiers</b> – interpret and translate text comment fields or other included qualifiers codes. Screen samples based on an interpretation of the codes.</font></li><li><font size="4" style="font-family:inherit;"><b>Censored Data</b> – Data that are reported as not detected or below detection limit should be utilized but accounted for statistically.</font></li><li><font size="4" style="font-family:inherit;"><b>Parameter and Method Selection</b></font></li><ul><li><font size="4" style="font-family:inherit;">Follow rules to combine appropriate methods, method/description combinations into comparable pseudo-method combinations.</font></li><li><font size="4" style="font-family:inherit;">Quantify samples by method and response species and use parsimony to select method, units, approach that conserves the most samples in temporal window.</font></li><li><font size="4" style="font-family:inherit;">Perform final data cleaning/QA check to assure either unique methods (or pseudo-method) for each nutrient and response species are separated<br /></font></li></ul><li><font size="4" style="font-family:inherit;"><b>Calculate metrics</b> or new parameters based on the data available.</font></li><li><font size="4" style="font-family:inherit;"><b>Outliers</b> – Analyze the data for potential outliers and screen.</font></li></ul><p style="margin-top:0px; margin-bottom:0.0001pt; text-align:justify;"><font size="4" style="font-family:inherit;"></font></p><p style="margin-top:0px; margin-bottom:0.0001pt; text-align:justify;"><br /></p><p style="margin-top:0px; margin-bottom:0.0001pt; text-align:justify;"><font size="4" style="font-family:inherit;">The original data set, the R code developed to perform the QA/QC steps, and the final dataset are available from <a href="https://epa.maps.arcgis.com/home/item.html?id=75d8596e313b430d9181feed4da8667b" style="color:rgb(0, 121, 193); text-decoration-line:none; font-family:inherit;" target="_blank">cormier.susan@epa.gov</a></font></p></div>

Copyright Text:

Min. Scale: 0

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

Drawing Info:

HasZ: false

HasM: false

Time Info:
Has Attachments: false

Has Geometry Properties: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID

Unique ID Field:

Global ID Field: GlobalID

Type ID Field:

Fields:
Templates:

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 8/6/2021 6:30:01 PM

Schema Last Edit Date: 8/6/2021 6:30:01 PM

Data Last Edit Date: 8/6/2021 6:30:01 PM

Supported Operations:   Query   Query Top Features   Query Analytic   Query Bins   Generate Renderer   Validate SQL   Get Estimates   ConvertFormat