Name: Core Samples
Display Field: Sample_IDs
Type: Feature Layer
Geometry Type: esriGeometryPoint
Description: The primary purpose of the sediment collection was to obtain vertical profile information from several areas in which no data existed and/or to compare with existing data to demonstrate the mercury and metals deposition resulting from the Comstock-era release (i.e., beginning in the 1860s). The specific areas targeted in the field work were from the Lahontan Reservoir, Sheckler Lake, and downstream areas potentially impacted by the historic river flows prior to construction of Lahontan Reservoir. In 2015, the Carson River and Lahontan Reservoir were at historic low levels as a result of a four-year drought. This presented the agency access to collect sediment core samples from areas that were normally below the waterline. EPA’s principal study question was whether mercury is indeed sediment bound and that Lahontan Reservoir, since it construction in 1915, serves as a mercury sink. The secondary purpose of the sediment sampling effort was to collect a range of mercury concentrations for assessing field screening equipment using Thermal Decomposition, Amalgamation, and Atomic Absorption Spectrophotometry (See EPA SW7473) and comparing the results to laboratory analytical data. The EPA is publishing this data in support of the Carson River Mercury NPL Site in Nevada. Data was compiled and evaluated for the OU2 Remedial Investigation Report (EPA, 2017), which describes the nature and extent of contamination from the Site. The report contains the Human Health Risk Assessment and Ecological Risk Assessment. Literature and other source Hg data are summarized in the RI for surface waters, sediments, and biological tissues. Full metadata: https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7BE7CEC799-2C79-4550-AAC6-E396635EC826%7D
Copyright Text: EPA, NDEP
Default Visibility: false
MaxRecordCount: 1000
Supported Query Formats: JSON, geoJSON, PBF
Min Scale: 0.0
Max Scale: 0.0
Supports Advanced Queries: true
Supports Statistics: true
Has Labels: false
Can Modify Layer: true
Can Scale Symbols: false
Use Standardized Queries: true
Supports Datum Transformation: true
Extent:
XMin: -119.18790699999994
YMin: 39.34699900000004
XMax: -118.81843399999997
YMax: 39.49215000000004
Spatial Reference: 4326
(4326)
LatestVCSWkid(0)
Drawing Info:
Renderer:
Simple Renderer:
Symbol: Style: esriSMSCircle
Color: [118, 42, 141, 255]
Size: 5.0
Angle: 0.0
XOffset: 0
YOffset: 0
Outline:
[255, 255, 255, 255] Width: 1
Label: N/A
Description: N/A
Transparency: 0
Labeling Info:
Advanced Query Capabilities:
Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false
Supports Percentile Statistics: true
Supports Having Clause: true
Supports Count Distinct: true
Supports Time Relation: true
Supports Sql Format: false
Supports Query Analytic: false
Supports Query With Current User: true
HasZ: false
HasM: false
Has Attachments: false
HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText
Type ID Field: null
Fields:
-
OBJECTID
(
type: esriFieldTypeOID, alias: OBJECTID
)
-
Shape
(
type: esriFieldTypeGeometry, alias: Shape
)
-
Sample_IDs
(
type: esriFieldTypeString, alias: Sample_IDs, length: 255
)
-
Date
(
type: esriFieldTypeDate, alias: Date, length: 8
)
-
LocationDescription
(
type: esriFieldTypeString, alias: LocationDescription, length: 255
)
-
Sampler
(
type: esriFieldTypeString, alias: Sampler, length: 255
)
-
Analyte
(
type: esriFieldTypeString, alias: Analyte, length: 255
)
-
Depth
(
type: esriFieldTypeString, alias: Depth, length: 255
)
-
Depth_in
(
type: esriFieldTypeString, alias: Depth_in, length: 255
)
-
Matrix
(
type: esriFieldTypeString, alias: Matrix, length: 255
)
-
Result
(
type: esriFieldTypeDouble, alias: Result
)
-
Units
(
type: esriFieldTypeString, alias: Units, length: 255
)
-
Qualify
(
type: esriFieldTypeString, alias: Qualify, length: 255
)
-
Lat
(
type: esriFieldTypeDouble, alias: Lat
)
-
Long
(
type: esriFieldTypeDouble, alias: Long
)
-
Comments
(
type: esriFieldTypeString, alias: Comments, length: 255
)
Supported Operations:
Query
Query Attachments
Query Analytic
Generate Renderer
Return Updates
Iteminfo
Thumbnail
Metadata