Branch of Quality Systems


Most Current Cumulative Time Series Charts and Statistical Summaries
for NWQL LS 1383

The Time Series Charts
The charts provide OBSP recovery information for every analyte at different concentrations for every schedule 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 schedule, 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 1383 - Semivolatile Compounds (base/neutral/acid - BNA), Whole Water Recoverable
Choose an analyte below or click here for all analytes sorted by NWQL parameter code Parameter CAS#
1,2,4-Trichlorobenzene 34551GCM57 120-82-1
1,2-Dichlorobenzene 34536GCM57 95-50-1
1,2-Diphenylhydrazine 82626GCM55 122-66-7
1,3-Dichlorobenzene 34566GCM57 541-73-1
1,4-Dichlorobenzene 34571GCM57 106-46-7
2,4,6-Trichlorophenol 34621GCM56 88-06-2
2,4-Dichlorophenol 34601GCM56 120-83-2
2,4-Dimethylphenol (Dichlorprop) 34606GCM56 105-67-9
2,4-Dinitrophenol (E) 34616GCM56 51-28-5
2,4-Dinitrotoluene 34611GCM57 121-14-2
2,6-Dinitrotoluene 34626GCM57 606-20-2
2-Chloronaphthalene 34581GCM57 91-58-7
2-Chlorophenol 34586GCM56 95-57-8
2-Nitrophenol 34591GCM56 88-75-5
3,3'-Dichlorobenzindine (E) 34631GCM55 91-94-1
4,6-Dinitro-2-methylphenol (E) 34657GCM56 534-52-1
4-Bromophenylphenylether 34636GCM57 101-55-3
4-Chloro-3-methylphenol 34452GCM56 59-50-7
4-Chlorophenyl phenyl ether 34641GCM57 7005-72-3
4-Nitrophenol (E) 34646GCM56 100-02-7
Acenaphthene 34205GCM57 83-32-9
Acenaphthylene 34200GCM57 208-96-8
Anthracene 34220GCM57 120-12-7
Benz[a]anthracene 34526GCM57 56-55-3
Benzidine (E) - Insufficient Data 39120GCM55 92-87-5
Benzo[a]pyrene 34247GCM57 50-32-8
Benzo[b]fluoranthene 34230GCM57 205-99-2
Benzo[ghi]perylene 34521GCM57 191-24-2
Benzo[k]fluoranthene 34242GCM57 207-08-9
bis(2-Chloroethoxy)methane 34278GCM57 111-91-1
Bis(2-Chloroethyl)ether 34273GCM57 111-44-4
bis(2-chloroisopropyl) ether 34283GCM57 108-60-1
Bis(2-Ethylhexyl) phthalate 39100GCM57 117-81-7
Butylbenzyl phthalate 34292GCM57 85-68-7
Chrysene 34320GCM57 218-01-9
Dibenz[a,h]anthracene 34556GCM57 53-70-3
Diethyl phthalate 34336GCM57 84-66-2
Dimethyl phthalate 34341GCM57 131-11-3
Di-n-butyl phthalate 39110GCM57 84-74-2
Di-n-octyl phthalate 34596GCM57 117-84-0
Fluroranthene 34376GCM57 206-44-0
Fluorene 34381GCM57 86-73-7
Hexachlorobenzene 39700GCM57 118-74-1
Hexachlorobutadiene (E) 39702GCM57 87-68-3
Hexachlorocyclopentadiene (E) 34386GCM57 77-47-4
Hexachloroethane (E) 34396GCM57 67-72-1
Indeno[1,2,3-cd]pyrene 34403GCM57 193-39-5
Isophorone 34408GCM57 78-59-1
Naphthalene 34696GCM57 91-20-3
Nitrobenzene 34447GCM57 98-95-3
n-Nitrosodimethylamine 34438GCM57 62-75-9
n-Nitrosodi-n-propylamine 34428GCM57 621-64-7
N-Nitrosodiphenylamine 34433GCM57 86-30-6
Pentachlorophenol (E) 39032GCM56 87-86-5
Penanthrene 34461GCM57 85-01-8
Phenol 34694GCM56 108-95-2
Pyrene 34469GCM57 129-00-0

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