inldata (version 1.2.7)

samples: Discrete Sample Data

Description

Water-quality information for both groundwater and surface water collected from monitoring stations in and around the Idaho National Laboratory, Idaho. The water samples were collected in the field and analyzed in a laboratory to obtain water-quality data. The dataset was obtained from the National Water Information System (NWIS), which is maintained by the U.S. Geological Survey. The NWIS is a comprehensive and distributed application that supports the acquisition, processing, and long-term storage of water data.

Usage

samples

Format

A data frame with columns:

site_nm

Local site name.

sample_dt

Date and time the sample was collected, in "America/Denver" time zone. Missing values of time were substituted with "12:00".

parm_short_nm

Parameter short name assigned by the USGS, such as "pH".

unit_cd

Units of measurement, see units dataset for unit descriptions.

remark_cd

Remark code (result level) used to qualify the parameter value. The codes and their meanings are as follows: NA (missing value) is a quantified value; "<" is where the actual value is known to be less than the value reported, that is, the measured concentration is below the reporting limit (RL) and represented as a censored (or nondetection) value. For censored values, the value reported is the RL; "E" is an estimated value, that is, the actual value is greater than the minimum detection limit (MDL) and less than the laboratory reporting level (LRL); "R" is a nondetect, result less than sample-specific critical level; and "U" is a material specifically analyzed for but not detected.

result_va

Parameter value.

lab_sd_va

Laboratory standard deviation (SD). For radiochemical data, SD is typically determined from the counting error. Prior to January 1, 2008, counting error was reported as two SD (Bartholomay and others, 2020, p. 27), therefore, these values were divided by 2.

lab_li_va

Lower confidence interval of the result value based on laboratory analysis.

lab_ui_va

Upper confidence interval of the result value based on laboratory analysis. In cases where the upper and lower limits are identical, the parameter is expressed as an exact value.

rpt_lev_va

Laboratory reporting limit in effect for the parameter and analytical method at the time the measurement was made.

rpt_lev_cd

Reporting level code that identifies the analytical reporting level appropriate for the analytical method. The codes and their meanings are as follows: "DLBLK" detection limit by blank data; "DLDQC" detection limit by DQCALC, lowest concentration that with 90 percent confidence will be exceeded no more than 1 percent of the time when a blank sample is measured; "IRL" interim reporting level, a temporary reporting level; "LRL" laboratory reporting level, equal to twice the yearly-determined LT-MDL; "LT-MDL" long-term method detection limit, a detection level derived by determining the standard deviation of a minimum of 24 MDL spike sample measurements over an extended period of time; "MDL" method detection limit, minimum concentration of a substance that can be measured and reported with a 99 percent confidence that the analyte concentration is greater than zero; "PQL" practical quantitation limits; "MRL" minimum reporting level, smallest measured concentration that can be reliably measured using a given analytical method; "RLDQC" reporting limit by DQCALC, is greater than or equal to two times the DLDQC; "SSLC" sample-specific critical level, the calculated and reported value is below which the radiochemistry result is considered a non-detect; and "SSMDC" sample-specific minimum detectable concentration, a reporting level that varies for each sample and is primarily used in radiochemical analyses.

medium_cd

Medium code that identifies the material type and quality assurance type of the sample. The codes and their meanings are as follows: "OAQ" is a blank sample collected for QC purposes; "WG" is water below land surface contained in the saturated zone (groundwater); "WGQ" is a groundwater quality-control (QC) sample; "WS" is water on the surface of the Earth (surface water); and "WSQ" surface water QC sample.

anl_ent_cd

Analyzing entity code of the organizational unit that performed the sample analysis used to obtain the result.

dqi_cd

Data quality indicator code that indicates the review status of a result. The codes and their meanings are as follows: "A" historical data, "R" reviewed and accepted, and "S" provisional (presumed satisfactory).

meth_cd

Method code, the codes are documented in the NWIS Method Code Dictionary.

sample_type_cd

Sample type code that identifies the quality-assurance (QA) type of a sample. The codes and their meanings are as follows: "2" is a blank sample; "6" is a reference material sample; "7" is a replicate sample taken from the environment; "9" is a regular sample taken from the environment; "B" is a unspecified QA sample; and "H" is a composite (time) sample.

db_no

2-digit NWIS database number. The codes and their meanings are as follows: "01" is the environmental database, and "10" is the QA database.

sample_id

Unique identifier for the water sample. The sample code is a concatenation of the site number, medium code, and date-time the sample was collected.

site_no

USGS site identification number.

pcode

USGS 5-digit parameter code. For example, the parameter code for Tritium is "07000".

rep_pair_id

Unique identifier used for matching pairs of replicate samples for a specific parameter. Replicate pairs are identified by matching a replicate sample (sample_type_cd equal to 7) with its corresponding regular environmental sample (sample_type_cd equal to 9).

result_tx

Remark about the water quality result

remark

Remarks pertaining to changes applied after the records were obtained from NWIS.

anl_dt

Result analysis date.

References

Bartholomay, R.C., Maimer, N.V., Rattray, G.W., and Fisher, J.C., 2020, An update of hydrologic conditions and distribution of selected constituents in water, Eastern Snake River Plain Aquifer and perched groundwater zones, Idaho National Laboratory, Idaho, emphasis 2016-18: U.S. Geological Survey Scientific Investigations Report 2019-5149 (DOE/ID-22251), 82 p., tools:::Rd_expr_doi("10.3133/sir20195149").

U.S. Geological Survey, 2024, National Water Information System---Water-Quality System (QWDATA) data retrieval program.

Examples

str(samples)

poi <- as.POSIXct(c("1989-01-01", "2019-01-01")) # period of interest
is_poi <- samples$sample_dt >= poi[1] & samples$sample_dt < poi[2]
is_stc <- samples$sample_type_cd %in% c("7", "9")

site_no <- "433253112545901" # well USGS 20
pcode <- "07000" # tritium, water, unfiltered, picocuries per liter
is <- is_poi & is_stc & samples$site_no == site_no & samples$pcode == pcode
d <- samples[is, ]
plotrix::plotCI(
  x = d$sample_dt,
  y = d$result_va,
  li = d$lab_li_va,
  ui = d$lab_ui_va
)

site_no <- "433322112564301" # well USGS 38
pcode <- "01030" # chromium, water, filtered, micrograms per liter
is <- is_poi & is_stc & samples$site_no == site_no & samples$pcode == pcode
d <- samples[is, ]
plotrix::plotCI(
  x = d$sample_dt,
  y = d$result_va,
  li = d$lab_li_va,
  ui = d$lab_ui_va
)