Metadata: Identification_Information: Citation: Citation_Information: Originator: Church, Stanley E. Originator: Fey, David L. Originator: Wanty, Richard B. Originator: Verplanck, Philip L. Originator: San Juan, Carma A. Publication_Date: 2012 Title: Quantitative Results of Aqueous Ferrous and Total Iron Analyses, Central Colorado Assessment Project Edition: 1.0 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: USGS Data Series Issue_Identification: DS-614 Publication_Information: Publication_Place: Denver, CO Publisher: U.S. Geological Survey Other_Citation_Details: "Water_FerrousIron" is the ArcGIS feature class name (file name). Online_Linkage: http://pubs.usgs.gov/ds/614 Larger_Work_Citation: Citation_Information: Originator: Church, Stanley E. Originator: San Juan, Carma A. Originator: Fey, David L. Originator: Schmidt, Travis S. Originator: Klein,Terry L. Originator: DeWitt, Ed H. Originator: Wanty, Richard B. Originator: Verplanck, Philip L. Originator: Mitchell, Katharine A. Originator: Adams, Monique G. Originator: Choate, LaDonna M. Originator: Todorov, Todor I. Originator: Rockwell, Barnaby W. Originator: McEachron, Luke Originator: Anthony, Michael W. Publication_Date: 2012 Title: Geospatial database for regional environmental assessment of central Colorado Geospatial_Data_Presentation_Form: document Series_Information: Series_Name: USGS Data Series Issue_Identification: DS-614 Publication_Information: Publication_Place: Denver, CO Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/ds/614 Description: Abstract: This digital dataset represents the concentration of total and ferrous iron (in mg/L) determined in 347 water samples collected by the U.S. Geological Survey (USGS) from July 2004 - September 2007 for the Central Colorado Assessment Project (CCAP) environmental assessment. Samples collected in the study area, a 20,800 square mile (53,800 square kilometers) region of central Colorado, were from watersheds selected for specific geologic conditions and (or) the presence or absence of mining activity. About 20 percent of the watersheds were sampled more than once to evaluate annual variations or sample collection bias. The samples were analyzed using the ferrozine method (To and others, 1999) to determine total iron and ferrous iron. Ferric iron was determined by difference. Purpose: Points in this dataset represent the field locations where stream-water samples were collected. Samples were analyzed for their aqueous total iron and ferrous iron concentrations and the ferric iron concentration was determined by difference. Supplemental_Information: The USGS conducted the Central Colorado Assessment Project (CCAP) from 2003 to 2008 to provide Federal, State, and local land management entities geoscience information to address issues related to urbanization of the Colorado Front Range Urban Corridor. Rapid population growth along the Front Range and in the CCAP region, which encompasses about 20,800 square miles (53,800 square kilometers) of central Colorado between the New Mexico and Wyoming borders (37 - 41 degrees north latitude), and from west of Denver to east of Vail, Colorado (approximately 104.8 - 106.625 degrees west longitude), has caused tremendous demand for natural resources and has created challenging land-management issues related to the wilderness/urban interface expansion. Regional CCAP data, including geologic, geochemical, geophysical, biological, and remote sensing data, were compiled to assess the availability of mineral resources; the geo-environmental effects of historical mining and wildfires; geologic controls on groundwater resources; and hazards such as landslides and flooding. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2004 Ending_Date: 2008 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -106.653847 East_Bounding_Coordinate: -104.863719 North_Bounding_Coordinate: 40.989098 South_Bounding_Coordinate: 37.725228 Keywords: Theme: Theme_Keyword_Thesaurus: American Geological Institute Glossary of Geology Theme_Keyword: water chemistry Theme_Keyword: sediment geochemistry Theme_Keyword: historical mining effects Theme_Keyword: benthic macroinvertebrate Place: Place_Keyword_Thesaurus: U.S. Board of Geographic Names (BGN) Geographic Place_Keyword: Colorado Place_Keyword: Arapaho National Forest Place_Keyword: Gunnison National Forest Place_Keyword: Pike National Forest Place_Keyword: Rio Grande National Forest Place_Keyword: Roosevelt National Forest Place_Keyword: Routt National Forest Place_Keyword: San Isabel National Forest Place_Keyword: White River National Forest Place_Keyword: Great Sand Dunes National Park Place_Keyword: Rocky Mountain National Park Place_Keyword: Alamosa County Place_Keyword: Boulder County Place_Keyword: Chaffee County Place_Keyword: Clear Creek County Place_Keyword: Conejos County Place_Keyword: Costilla County Place_Keyword: Custer County Place_Keyword: Douglas County Place_Keyword: Eagle County Place_Keyword: El Paso County Place_Keyword: Fremont County Place_Keyword: Gilpin County Place_Keyword: Grand County Place_Keyword: Gunnison County Place_Keyword: Huerfano County Place_Keyword: Jackson County Place_Keyword: Jefferson County Place_Keyword: Lake County Place_Keyword: Larimer County Place_Keyword: Las Animas County Place_Keyword: Park County Place_Keyword: Pitkin County Place_Keyword: Pueblo County Place_Keyword: Saguache County Place_Keyword: Summit County Access_Constraints: None Use_Constraints: Data have been checked to ensure the accuracy. If any errors are detected, please notify the originating office. The U.S. Geological Survey strongly recommends that careful attention be paid to the metadata file associated with these data. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcGIS format, this metadata file may include some ArcGIS-specific terminology. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Richard B. Wanty Contact_Organization: U.S. Geological Survey Contact_Position: Research Chemist Contact_Address: Address_Type: mailing address Address: Box 25046, Mail Stop 973 City: Denver State_or_Province: Colorado Postal_Code: 80225 Country: United States Contact_Voice_Telephone: 303-236-1819 Contact_Facsimile_Telephone: 303-236-3200 Contact_Electronic_Mail_Address: rwanty@usgs.gov Data_Set_Credit: Spatial data sets supporting the Central Colorado Assessment Project (CCAP) were developed by the U.S. Geological Survey Central Mineral and Environmental Resources Science Center (CMERSC) and the Crustal Geophysics and Geochemistry Science Center (CGGSC) in cooperation with the U.S. Geological Survey Geology and Environmental Change Science Center (GECSC), the Colorado Geological Survey (CGS), the Rocky Mountain Region U.S. Department of Agriculture-Forest Service (USDA-FS) and the National Park Service (NPS). Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3500 Cross_Reference: Citation_Information: Originator: Granitto, Matthew Originator: Dewitt, Ed H. Originator: Klein, Terry L. Publication_Date: 2010 Title: Central Colorado Assessment Project (CCAP) - Geochemical data for rock, sediment, soil, and concentrate sample media Edition: 1.0 Geospatial_Data_Presentation_Form: document Series_Information: Series_Name: USGS Data Series Issue_Identification: DS-509 Publication_Information: Publication_Place: Denver, CO Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/ds/509/ Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: The water samples in this dataset were chemically analyzed in the USGS-Denver laboratories using ferrozine reagent and spectrophotometric analysis. There are no water standards for ferrous/total iron ratio determination. The accuracy of the method was ensured by use of daily made calibration standards; precision was monitored by performing laboratory replicate analyses when possible. Values that were less than the lower detection limits of an analytical method were reported as a negative number. Logical_Consistency_Report: A site is a single geographic location where water samples were obtained. Multiple points at the same geographic coordinates indicate where samples were obtained over multiple years. The identification of the first sample acquired at a site is used as the general identification of the field site. Ferrozine reagent and spectrophotometric analysis were used for chemical analyses of water samples throughout the project. Completeness_Report: Samples were collected from a 20,800 square mile (53,800 square kilometers) region of central Colorado. About 80% of the samples were collected from 229 small watersheds selected for specific geologic conditions and the presence or absence of mining activity. The remaining 20% of the samples were collected from larger drainage basins to evaluate metal attenuation and dilution downstream from mining districts or large hydrothermally altered areas. Together the sample sites cover about 80% of the land area in the CCAP study area. Favorable stream sites were occasionally not sampled due to access restrictions or lack of stream flow at the time of the field visit. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Spatial locations were determined from hand-held global positioning system (GPS) devices. In general, the GPS units used by field scientists recorded sample locations to within 100 feet (30 meters) of the true location. When more than one scientist collected field samples at a site on different dates, the reported location is a composite of the GPS measurements and the location is verified using a geographic information system (GIS) and digital topographic maps. Water samples were typically collected at the recorded GPS location; sediment and aquatic insect samples were usually collected within 75 feet (22 meters) of the indicated location. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: To, T.B. Originator: Nordstrom, D.K. Originator: Cunningham, K.M. Originator: Ball, J.W. Originator: McCleskey, R.B. Publication_Date: 1999 Title: New method for the direct determination of dissolved Fe (III) concentration in acid mine waters Geospatial_Data_Presentation_Form: document Series_Information: Series_Name: Environmental Science and Technology Issue_Identification: v.33 Publication_Information: Publication_Place: Port Angeles, WA Publisher: American Chemical Society Online_Linkage: http://pubs.acs.org/doi/abs/10.1021/es980684z Type_of_Source_Media: online Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1999 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: To and others, 1999 Source_Contribution: Analytical method used for chemical analyses of iron content. Process_Step: Process_Description: Water samples were collected from suitable stream sites from July 2004 to September 2007. Sample locations, digitally recorded with hand-held GPS devices, were imported into ArcGIS to produce the point features in this data set. Attributes summarizing location and iron chemistry were added by the authors. The water samples were chemically analyzed for dissolved total and ferrous iron. Filtered-acidified (FA) fractions were collected by filtering through a 0.45 micrometer syringe-mounted filter and acidified with ultra-pure hydrochloric acid, and analyzed by spectrophotometry (To and others, 1999). Source_Used_Citation_Abbreviation: To and others, 1999 Process_Date: 2004-2009 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point Point_and_Vector_Object_Count: 347 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 13 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -105.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000100 Ordinate_Resolution: 0.000100 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.400000 Denominator_of_Flattening_Ratio: 294.978698 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.000100 Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Water_FerrousIron Entity_Type_Definition: The geographic location and analytical results of stream (water) samples Entity_Type_Definition_Source: Metadata authors Attribute: Attribute_Label: OBJECTID Attribute_Definition: Internal feature number. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Coordinates defining the features. Attribute: Attribute_Label: SampleID Attribute_Definition: Unique identification assigned to each sample collected from a stream site Attribute_Definition_Source: Metadata authors Attribute_Domain_Values: Unrepresentable_Domain: Alpha numeric number consisting of a two digit year, a state identifier, and a three digit site number Attribute: Attribute_Label: Longitude_GIS Attribute_Definition: Longitude coordinate of sample site reported in decimal degrees. Typically the coordinate is determined from multiple GPS measurements and verified using a GIS and digital topographic data. Attribute_Definition_Source: Metadata authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -106.63616 Range_Domain_Maximum: -104.86801 Attribute_Units_of_Measure: degree Attribute: Attribute_Label: Latitude_GIS Attribute_Definition: Latitude coordinate of sample site reported in decimal degrees. Typically the coordinate is determined from multiple GPS measurements and verified using a GIS and digital topographic data. Attribute_Definition_Source: Metadata authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 37.73471 Range_Domain_Maximum: 40.97751 Attribute_Units_of_Measure: degree Attribute: Attribute_Label: Total_Iron_mg_L Attribute_Definition: Total iron determined by the ferrozine method, with added reductant to quantitavely measure total iron. Detection limit is 0.01 mg/L. Sample for this method is filtered through a 0.45 micron filter, preserved with HCl, and stored in an amber polyethylene bottle. Negative values indicate determinations less than the detection limit of the analytical method; the absolute value of the negative number is the detection limit. Attribute_Definition_Source: Metadata authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.01 Range_Domain_Maximum: 145 Attribute_Units_of_Measure: millgrams per liter Attribute: Attribute_Label: Fe2_mg_L Attribute_Definition: Ferrous iron determined by ferrozine method. Detection limit is 0.01 mg/L. Sample for this method is filtered through a 0.45 micron filter, preserved with HCl, and stored in an amber polyethylene bottle. Negative values indicate determinations less than the detection limit of the analytical method; the absolute value of the negative number is the detection limit. Attribute_Definition_Source: Metadata authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.01 Range_Domain_Maximum: 11.2 Attribute_Units_of_Measure: millgrams per liter Attribute: Attribute_Label: Fe3_mg_L Attribute_Definition: Ferric iron determined by subtracting ferrous iron from total iron, both have been determined by the ferrozine method. Detection limit for ferric iron is 0.005 mg/L. This is a calculated value, and as such the detection limit is determined to be a level that allows inclusion of sample concentrations from the difference between total- and ferrous-iron determinations that result in values lower than the detection limit of either total or ferrous iron. Sample for this method is filtered through a 0.45 micron filter, preserved with HCl, and stored in an amber polyethylene bottle. Negative values indicate determinations less than the detection limit of the analytical method; the absolute value of the negative number is the detection limit. A null (or empty cell) means not analyzed. Attribute_Definition_Source: Metadata authors Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.005 Range_Domain_Maximum: 137 Attribute_Units_of_Measure: millgrams per liter Overview_Description: Entity_and_Attribute_Overview: Additional discussions of data are provided in the accompanying report. Entity_and_Attribute_Detail_Citation: Null values (blank cells) indicate no measurements were made or no analyses were performed for a constituent. In the case of ferric iron (Fe3), which is calculated as the difference between total and ferrous iron (Fe2) by the ferrozine method, a blank cell may also indicate a null value resulting from either total or ferrous iron being below the detection limit, with the consequence of an indeterminate value for ferric iron. In the case of a null value for ferric iron, if that is because the sample was not analyzed for ferrozine iron, both the total and ferrous reported values will be null, as well. If a null value for ferric iron is the result of an indeterminate calculation, either or both total and ferrous iron will be reported as less than their detection limit. Negative values in constituent fields indicate the element was analyzed for but was below the instrumental detection limit; the negative sign is equivalent to a less than sign (<) and the absolute value of the negative number is the detection limit. For example, a "Fe" value of -0.01 indicates that iron was measured for in the sample, and was not present at a level of <0.01 mg/L. Because detection limits are based on an evaluation of signal/noise ratio of the analytical instrumentation, they may vary in accordance with the performance of the analytical instrumentation over time. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Position: USGS Information Services Contact_Address: Address_Type: mailing address Address: Box 25286, DFC City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303-236-5486 Resource_Description: webmaster@geology.cr.usgs.gov Distribution_Liability: This database, identified as DS-614, has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ESRI File Geodatabase Format_Version_Number: 9.3 File_Decompression_Technique: Unzip Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/ds/614 Fees: None Metadata_Reference_Information: Metadata_Date: 20100513 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Carma San Juan Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: Box 25046, Mail Stop 973 City: Denver State_or_Province: Colorado Postal_Code: 80225 Country: United States Contact_Voice_Telephone: (303) 236-2450 Contact_Facsimile_Telephone: (303) 236-3200 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile