Richard Niswonger Ramon Naranjo David Smith Jim Constantz Kip Allander Donald Rosenberry Bethany Neilson Michael Rosen David Stonestrom 2017 Microsoft Excel spreadsheets Reston, VA U.S Geological Survey https://doi.org/10.5066/F7NG4NTG This data set contains the following parameters: sediment and water temperature, dissolved nitrate plus nitrite dissolved, ammonium, total Kjeldahl nitrogen, soluble orthophosphate, dissolved phosphorus, total phosphorus, and dissolved organic carbon. Data was collected to estimate nutrient mass fluxes to Lake Tahoe and to better understand biogeochemical processes within the stream-lake interface. 20120919 20130917 ground condition Complete Not planned -119.946 -119.933 39.23830 39.16476 USGS Thesaurus Surface water quality USGS Metadata Identifier USGS:589c8b00e4b0efcedb74554e Geographic Names Information System (GNIS) Lake Tahoe, Washoe County Incline Creek Marlette Creek none none Richard Niswonger USGS mailing and physical

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Menlo Park California 94025 United States 650 329 4534 rniswon@usgs.gov https://www.sciencebase.gov/catalog/file/get/589c8b00e4b0efcedb74554e?f=__disk__5a%2F6b%2F74%2F5a6b745035781c7be2ca7a47ff0b272c2eed27ff&allowOpen=true Images of study sites and photographs showing lateral distances between sampling and sensor locations TIFF Richard Niswonger 20161222 Journal on line publication Water Resources Research http://onlinelibrary.wiley.com/doi/10.1002/2016WR019538/abstract 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 Water quality samples were taken according to USGS water quality sampling protocol. Samples were taken using 125 mL bottles, stored in ice coolers and delivered to the laboratory for analysis within 48 hours. Wilde, F.D. (2011), Water-quality sampling by the U.S. Geological Survey—Standard protocols and procedures: U.S. Geological Survey Fact Sheet 2010-3121, 2 p. Available at http://pubs.usgs.gov/fs/2010/3121. 20130918 A graphic is attached that shows more detailed information about the location of sampling/measurement locations (Sampling_locations.tiff). Approximate sampling location of Marlette Creek: Lat: 39° 9'53.12; Lon:119°55'58.80. Approximate sampling location of Incline Creek: Lat: 39°14'17.87; Lon: 119°56'45.50 using the WGS-84 World Geodetic System. Point CSV file called "Water_quality_data.csv" For each sampling location, spreadsheet contains sample time, locations, and nutrient and other water quality parameters. Richard Niswonger Site Site label that corresponds to map of study area showing sampling locations. First letter defines whether sample corresponds to Marlette (M) or Incline (I) study areas. Second letter defines transect; E (closest to lakeshore) to A (furthest from lakeshore). Number represents depths below water table (1=20cm, 2=40cm, 3=60cm). Site name "Marlette Pond" represents a surface water sample taken in the pond water column; "Lake Tahoe" represents surface sample taken in lake water column directly offshore of nutrient sampling transect; "Incline Creek" represents surface water sample taken in Incline Creek 12 m upstream or lake water line. Producer defined Sample date and time Data and Pacific Standard Time sample/measurement was taken Producer defined Distance from lake shore (m) Distance in meters of sample/measurement location from shoreline of Lake Tahoe Producer defined Depth (cm) Depth in centimeters below water table that sample/measurement water taken Producer defined 0 200 centimeters N03-N (ug/L) Concentration of nitrogen as nitrate in sample; sampled through 0.45 um membrane filters; method detection limit 2 ug/L producer defined 0 2000 micro-grams per liter NH4-N (ug/L) Concentration of nitrogen and ammonium in sample; ampled through 0.45 um membrane filters; method detection limit 3 ug/L Producer defined 0 2000 micro-grams per liter TKN (ug/L) Concentration of total Kjeldahl nitrogen in sample; unfiltered; organic nitrogen plus ammonium; method detection limit 40 ug/L producer defined 0 2000 micro-grams per liter SRP (ug/L) Concentration of soluble reactive phosphorus in sample; sampled through 0.45 um membrane filters; method detection limit 1 ug/L producer defined 0 2000 micro-grams per liter TP (ug/L) Concentration of total phosphorus in sample; unfiltered; method detection limit 2 ug/L Producer defined 0 2000 micro-grams per liter DP (ug/L) Concentration of dissolved phosphorus in sample; sampled through 0.45 um membrane filters; method detection limit 2 ug/L producer defined 0 2000 micro-grams per liter DO (mg/L) Measured dissolved oxygen; SYI instrument was used with a flow through cell where water was pumped using a peristaltic pump. producer defined 0 10 milli-grams per liter SPC (uS/cm) Measured specific conductance; SYI instrument was used with a flow through cell where water was pumped using a peristaltic pump. Producer defined 50 160 microsiemens per centimeter pH acidity or alkalinity of a solution on a logarithmic scale; SYI instrument was used with a flow through cell where water was pumped using a peristaltic pump. Producer defined 0 10 -log10 c, where c is the hydrogen ion concentration in moles per liter Temp (C) Temperature; SYI instrument was used with a flow through cell where water was pumped using a peristaltic pump. Producer defined 0 20 degrees Celsius DOC (mg/L) Concentration of dissolved organic carbon in sample; DOC was sampled in 300 mL amber baked glass bottles and analyzed using high temperature catalytic oxidation, method detection limit 0.4 mg/L Producer defined 0 10 milli-grams per liter CSV file called "Sediment_temperature_Marlette.csv" Measured sediment temperatures between 10 cm and 100 cm beneath Marlette Creek Richard Niswonger Data type T = Temperature in degrees Celsius Producer defined 0 20 degrees Celsius site and transect MA=Marlette Transect A; MB=Marlette Transect B; MC=Marlette Transect C; MD=Marlette Transect D; ME=Marlette Transect E Producer defined MA,MB,MC,MD,ME MA=Marlette Transect A; MB=Marlette Transect B; MC=Marlette Transect C; MD=Marlette Transect D; ME=Marlette Transect E Producer defined sensor depth depth of sensor below ground surface in centimeters producer defined 2,3,4,5 1=10cm, 2=20cm, 3=40cm, 4=60cm, 5=100cm Producer defined CSV file called "Sediment_temperature_Incline.csv" Measured sediment temperatures between 10 cm and 100 cm beneath Incline Creek Richard Niswonger Data type T = Temperature in degrees Celsius Producer defined 0 20 degrees Celsius Site and transect IA=Incline Transect A; IB=Incline Transect B; IC=Incline Transect C; ID=Incline Transect D; IE=Incline Transect E Producer defined IA,IB,IC,ID,IE IA=Incline Transect A; IB=Incline Transect B; IC=Incline Transect C; ID=Incline Transect D; IE=Incline Transect E producer defined Sensor depth depth of sensor below ground surface in centimeters Producer defined 2,3,4,5 1=10cm, 2=20cm, 3=40cm, 4=60cm, 5=100cm Producer defined U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 United States 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. 20200831 Richard Niswonger USGS Hydrologist mailing and physical

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Menlo Park California 94025 USA 650 329 4534 rniswon@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998