Branch of Quality Systems


Most Current Time Series Charts for NWQL LS 5506

The Time Series Charts
The charts provide OBSP recovery information for every analyte at different concentrations for every method OBSP assesses. The charts exhibit a Locally Weighted Scatterplot Smoothing (LOWESS) line. This line is used to help observe patterns and trends of the data over time. The time series charts also show bias and variability of the OSBP data. The most current time series charts in the table below will be overwritten periodically and will contain data that is currently being reviewed. All data is provisional and may change if the OBSP deems necessary.

There are two tables provided at the bottom of every time series chart that show statistical summaries.

Plotted Points Statistics Table
Description of the OBSP QA recoveries grouped by concentration level. The statistics in the table: mean, median, standard deviation and F-pseudosigma define bias and variability of the OBSP recoveries.

Sample Statistics Table
Counts (N) - The quantity of the variety of items.
Plotted - This number equals the total number in the above table.
Estimated Values - There are a number of reasons the laboratory will estimate (E) a result. If there are 100% of the results estimated the analyte is identified as a permanently estimated compound (analyte name in time series chart will be red).
Deleted Values - The laboratory may delete an entire sample or a single analyte for a number of reasons.
Spiked, Censored - A term for those samples that were spiked and correctly reported as less than a reporting level (possibly a raised reporting level) - the expected concentration was at a lower concentration than the censored result provided by the laboratory.
Spiked - The number of times the OBSP has submitted this analyte to the NWQL.
False Negative - The number of times the laboratory reports this analyte as not present in the sample when it is there.
Not Spiked - The number of times the OBSP has submitted a sample to the appropriate method, without this analyte.
False Positive - The number of times the laboratory reports this analyte as present when it is not in the sample.

The charts and data that you might secure from this U.S. Geological Survey (USGS) web page (identified as "OBSP") have not received official USGS approval and as such are provisional and subject to revision. The charts and data are released on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use.

Lab Schedule 5506 - PAHs and other semi-volatile organics in solids/sediment
Choose an analyte below or click here for all analytes sorted by NWQL parameter code Parameter CAS#
1,2,4-Trichlorobenzene 64095GCM13 120-82-1
1,2-Dimethylnaphthalene 64097GCM13 573-98-8
1,6-Dimethylnaphthalene 64099GCM13 575-43-9
1-Methyl-9H-fluorene 64100GCM13 1730-37-6
1-Methylphenanthrene 64101GCM13 832-69-9
1-Methylpyrene 64102GCM13 2381-21-7
2,3,6-Trimethylnaphthalene 64103GCM13 829-26-5
2,6-Dimethylnaphthalene 63167GCM13 581-42-0
2-Ethylnaphthalene 64104GCM13 939-27-5
2-Methylanthracene 64105GCM13 613-12-7
4H-Cyclopenta[def]phenanthrene 64106GCM13 203-64-5
Acenaphthene 64108GCM13 83-32-9
Acenaphthylene 64109GCM13 208-96-8
Anthracene 63180GCM13 120-12-7
Anthraquinone 63181GCM13 84-65-1
Benz[a]anthracene 63610GCM13 56-55-3
Benzo[a]pyrene 63183GCM13 50-32-8
Benzo[b]fluoranthene 64111GCM13 205-99-2
Benzo[e]pyrene 64112GCM13 192-97-2
Benzo[ghi]perylene 64113GCM13 191-24-2
Benzo[k]fluoranthene 64114GCM13 207-08-9
Bis(2-ethylhexyl) phthalate 63187GCM13 117-81-7
Carbazole 63194GCM13 86-74-8
Chrysene 64115GCM13 218-01-9
Dibenz[a,h]anthracene 64116GCM13 53-70-3
Dibenzothiophene 64117GCM13 132-65-0
Diethyl phthalate 63202GCM13 84-66-2
Fluoranthene 63208GCM13 206-44-0
Fluorene 64107GCM13 86-73-7
Hexachlorobenzene 63631GCM13 118-74-1
Indeno[1,2,3-cd]pyrene 64118GCM13 193-39-5
Naphthalene 63220GCM13 91-20-3
Pentachloroanisole 64119GCM13 1825-21-4
Pentachloronitrobenzene 63650GCM13 82-68-8
Perylene 64120GCM13 198-55-0
Phenanthrene 63224GCM13 85-01-8
Phenanthridine 64121GCM13 229-87-8
Pyrene 63227GCM13 129-00-0

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