Pfeifle, C.A. Cain, J.L. Rasmussen, R.B. 2016 Text (tab-delimited, .txt) Reston, VA U.S. Geological Survey data release http://dx.doi.org/10.5066/F77M061X Cassandra A. Pfeifle Jessica L. Cain Ryan B. Rasmussen 2016 U.S. Geological Survey Open-File Report Reston, VA U.S. Geological Survey http://dx.doi.org/10.3133/ofr20161137 The dataset contains the analytical results for quality-control samples collected during the surface-water sampling for the Triangle Area Water Supply Monitoring Project. The data are sampling-equipment blanks, sampling-vehicle (ambient) blanks, and field blanks collected during October 2011 through September 2013. Several study sites contained in this dataset were sampled for other USGS projects during the same time frame. Unless the quality-control samples at these sites were collected in conjunction with the Triangle Area Water Supply Monitoring Project, the data for other projects are not included in the dataset. Since 1988, the U.S. Geological Survey and a consortium of local governments have tracked water-quality conditions and trends in the water-supply lakes and streams in the Triangle area of North Carolina located within the upper Cape Fear and Neuse River Basins. These quality-control samples were collected and reviewed during October 2011 through September 2013 to ensure the project data-quality objectives were met. 20111001 20130930 ground condition Complete Not planned None water quality surface water nutrient data major ions data unfiltered metals data total organic carbon data biological data USGS Metadata Identifier USGS:5798cf39e4b0589fa1c72904 None North Carolina Chatham County Durham County Orange County Wake County none none Cassandra A. Pfeifle U.S. Geological Survey - South Atlantic Water Science Center mailing and physical

3916 Sunset Ridge Road

Raleigh North Carolina 27607 United States 919-571-4078 cmendoza@usgs.gov No formal attribute accuracy tests were conducted No formal logical accuracy tests were conducted Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. No formal positional accuracy tests were conducted No formal positional accuracy tests were conducted Data were pulled from the USGS NWIS Water-Quality System (QWDATA) database. 20150728 Analytical results for blanks collected from October 2011 through September 2013 during surface-water sampling at the Triangle Area Supply Monitoring Project study sites, North Carolina The dataset contains the quality-control data collected for the Triangle Area Water Supply Monitoring Project. Producer-defined Type of Blank Defines the type of blanks collected U.S. Geological Survey Equipment Blanks are collected prior to sampling in a laboratory to ensure the cleaning procedures and the equipment do not bias the environmental results. U.S. Geological Survey, variously dated, National field manual for the collection of water-quality data: U.S. Geological Survey Techniques of Water-Resources Investigations, book 9, chaps. A1-A10, available online at http://pubs.water.usgs.gov/twri9A Vehicle Blanks collected to determine the analyte concentrations present in the ambient atmosphere when samples are collected, processed, and preserved. U.S. Geological Survey, variously dated, National field manual for the collection of water-quality data: U.S. Geological Survey Techniques of Water-Resources Investigations, book 9, chaps. A1-A10, available online at http://pubs.water.usgs.gov/twri9A Field Blanks collected to determine if the environmental data was biased by determining the concentrations of target analytes while in the field using the same cleaning, sampling and processing protocols as performed on the environmental samples. U.S. Geological Survey, variously dated, National field manual for the collection of water-quality data: U.S. Geological Survey Techniques of Water-Resources Investigations, book 9, chaps. A1-A10, available online at http://pubs.water.usgs.gov/twri9A Sample date The date the sample was collected. U.S. Geological Survey The month, date, and year (MM/DD/YYYY) the sample was collected. Sample time The time assigned to the sample during sampling. U.S. Geological Survey The hour and minute (HHMM) assigned to the sample during sampling. Calcium, filtered, milligrams per liter Calcium, water, filtered, milligrams per liter U.S. Geological Survey Results for calcium, water, filtered, milligrams per liter. "--" denotes no data for the sample. Magnesium, filtered, milligrams per liter Magnesium, water, filtered, milligrams per liter U.S. Geological Survey Results for magnesium, water, filtered, milligrams per liter. "--" denotes no data for the sample. Potassium, filtered, milligrams per liter Potassium, water, filtered, milligrams per liter U.S. Geological Survey Results for potassium, water, filtered, milligrams per liter. "--" denotes no data for the sample. Sodium, filtered, milligrams per liter Sodium, water, filtered, milligrams per liter U.S. Geological Survey Results for sodium, water, filtered, milligrams per liter. "--" denotes no data for the sample. Chloride, filtered, milligrams per liter Chloride, water, filtered, milligrams per liter U.S. Geological Survey Results for chloride, water, filtered, milligrams per liter. "--" denotes no data for the sample. Fluoride, filtered, milligrams per liter Fluoride, water, filtered, milligrams per liter U.S. Geological Survey Results for fluoride, water, filtered, milligrams per liter. "--" denotes no data for the sample. Silica, filtered, milligrams per liter as SiO2 Silica, water, filtered, milligrams per liter as SiO2 U.S. Geological Survey Results for silica, water, filtered, milligrams per liter as SiO2. "--" denotes no data for the sample. Sulfate, filtered, milligrams per liter Sulfate, water, filtered, milligrams per liter U.S. Geological Survey Results for sulfate, water, filtered, milligrams per liter. "--" denotes no data for the sample. Ammonia + organic N, unfiltered, milligrams per liter as N Ammonia plus organic nitrogen, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey Results for ammonia plus organic nitrogen, water, unfiltered, milligrams per liter as nitrogen. "--" denotes no data for the sample. Ammonia, filtered, milligrams per liter as N Ammonia, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey Results for ammonia, water, filtered, milligrams per liter as nitrogen. "--" denotes no data for the sample. Nitrate + nitrite, filtered, milligrams per liter as N Nitrate plus nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey Results for nitrate plus nitrite, water, filtered, milligrams per liter as nitrogen. "--" denotes no data for the sample. Orthophosphate, filtered, milligrams per liter as P Orthophosphate, water, filtered, milligrams per liter as phosphorus U.S. Geological Survey Results for orthophosphate, water, filtered, milligrams per liter as phosphorus. "--" denotes no data for the sample. Phosphorus, unfiltered, milligrams per liter as P Phosphorus, water, unfiltered, milligrams per liter as phosphorus U.S. Geological Survey Results for phosphorus, water, unfiltered, milligrams per liter as phosphorus. "--" denotes no data for the sample. Aluminum, unfiltered, recoverable, micrograms per liter Aluminum, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey Results for aluminum, water, unfiltered, recoverable, micrograms per liter. "--" denotes no data for the sample. Cadmium, unfiltered, recoverable, micrograms per liter Cadmium, water, unfiltered, micrograms per liter U.S. Geological Survey Results for cadmium, water, unfiltered, micrograms per liter. "--" denotes no data for the sample. Chromium, unfiltered, recoverable, micrograms per liter Chromium, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey Results for chromium, water, unfiltered, recoverable, micrograms per liter. "--" denotes no data for the sample. Cobalt, unfiltered, recoverable, micrograms per liter Cobalt, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey Results for cobalt, water, unfiltered, recoverable, micrograms per liter. "--" denotes no data for the sample. Copper, unfiltered, recoverable, micrograms per liter Copper, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey Results for copper, water, unfiltered, recoverable, micrograms per liter. "--" denotes no data for the sample. Iron, unfiltered, recoverable, micrograms per liter Iron, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey Results for iron, water, unfiltered, recoverable, micrograms per liter. "--" denotes no data for the sample. Lead, unfiltered, recoverable, micrograms per liter Lead, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey Results for lead, water, unfiltered, recoverable, micrograms per liter. "--" denotes no data for the sample. Manganese, unfiltered, recoverable, micrograms per liter Manganese, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey Results for manganese, water, unfiltered, recoverable, micrograms per liter. "--" denotes no data for the sample. Mercury, unfiltered, recoverable, micrograms per liter Mercury, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey Results for mercury, water, unfiltered, recoverable, micrograms per liter. "--" denotes no data for the sample. Molybdenum, unfiltered, recoverable, micrograms per liter Molybdenum, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey Results for molybdenum, water, unfiltered, recoverable, micrograms per liter. "--" denotes no data for the sample. Nickel, unfiltered, recoverable, micrograms per liter Nickel, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey Results for nickel, unfiltered, recoverable, micrograms per liter. "--" denotes no data for the sample. Silver, unfiltered, recoverable, micrograms per liter Silver, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey Results for silver, unfiltered, recoverable, micrograms per liter. "--" denotes no data for the sample. Zinc, unfiltered, recoverable, micrograms per liter Zinc, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey Results for zinc, water, unfiltered, recoverable, micrograms per liter. "--" denotes no data for the sample. Arsenic, water, unfiltered, micrograms per liter Arsenic, water, unfiltered, micrograms per liter U.S. Geological Survey Results for arsenic, water, unfiltered, micrograms per liter. "--" denotes no data for the sample. Selenium, unfiltered, micrograms per liter Selenium, water, unfiltered, micrograms per liter U.S. Geological Survey Results for selenium, water, unfiltered, micrograms per liter. "--" denotes no data for the sample. Total organic carbon, unfiltered, milligrams per liter Organic carbon, water, unfiltered, milligrams per liter U.S. Geological Survey Results for organic carbon, water, unfiltered, milligrams per liter. "--" denotes no data for the sample. U.S. Geological Survey - ScienceBase U.S. Geological Survey - ScienceBase mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The files are saved in text (.txt, tab-delimited) format. Format issues (date format can change, loss of leading zeros for station numbers, or loss of trailing zeros for results) may appear if you import the files into a spreadsheet. 20200827 Cassandra A. Pfeifle U.S. Geological Survey mailing and physical

3916 Sunset Ridge Road

Raleigh NC 27607 United States 919-571-4078 cmendoza@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998