National Water Quality Laboratory Technical Memoranda

22-04 | September 29,  2022 

• Revision of results for ammonia by KONE for 817 samples analyzed January – March 2022
• Attachment 1-3116censoring.pdf
• Caitlyn M. Benson, Laboratory & Analytical Services Division (cmbenson@usgs.gov) (303) 236-3966
• Laura Stone, Laboratory & Analytical Services Division (lmstone@usgs.gov) (303) 236-3271

22-03 | October 5,  2022 

• Alkalinity samples analyzed at the Analytical Trace Element Chemistry and Common Services Laboratory (USGSTECO)
• Laura Stone, Laboratory & Analytical Services Division (lmstone@usgs.gov) (303) 236-3271
• Lisa Olsen, Laboratory & Analytical Services Division (ldolsen@usgs.gov) (703) 648-5809

22-02 | April 18, 2022

• New journal publication for use when citing the detection limit procedures and data reporting (repor ting level) conventions applied to NWQL methods in USGS publications
• William T. Foreman, Strategic Laboratory Science Branch (wforeman@usgs.gov)
• Dawn M. Hemmerle, National Water Quality Laboratory (dhemmerle@usgs.gov)
• Lisa D. Olsen, Laboratory & Analytical Services Division of the USGS Water Mission Area (ldolsen@usgs.gov)

22-01 | February 10, 2022

• Laboratory contamination bias leads to limits on low-concentration data reporting for hexamethylenetetramine and data reload for hexamethylenetetramine, and metadata reload for gabapentin, guanylurea, and ractopamine, to the National Water Information System for samples analyzed from October 2016 through March 4, 2021, for pharmaceuticals in filtered water by National Water Quality Laboratory schedule 2440.
• NWQL_TechMemo2022.01_Appendix.xlsx
• William T. Foreman, Strategic Laboratory Science Branch, Laboratory and Analytical Services Division (wforeman@usgs.gov) (303) 236-3942
• Marshall G. Nisbeth and Lisa M. Folsom, National Water Quality Laboratory (lfolsom@usgs.gov) (303) 236-3284
• Lisa Olsen, Laboratory & Analytical Services Division (ldolsen@usgs.gov) (703) 648-5809

21-02 | September 8, 2022

• Reload of qualified environmental sample results for Ammonia, Nitrite and Orthophosphate by the Kone Method due to loss of scientific integrity
• Attachment 1: Original and corrected results reported by the USGS National Water Quality Laboratory for concentrations of ammonia (NH3 + NH4+), water, filtered, mg/L as N; nitrite, water, filtered, mg/L as N; and orthophosphate, water, filtered, mg/L as P in environmental water samples analyzed from March 2019 – June 2022, that were affected by a data integrity issue.
• Attachment 2: Counts of all QC results from March 2019 – July 2020 categorized by analyte code and whether the result failed QC criteria "high" or "low" or if the result passed QC acceptance criteria.
• Attachment 3: Rapi-Note 22-18; Reload of value-qualifier codes and comments associated with results for laboratory codes 3116, 3117, and 3118 ("Kone 3-Channel method") associated with scientific data integrity incident
• Attachment 4: R Scripts for logic checks applied to revise and qualify the KONE Method results

21-01 | October 19, 2021

• Reload of mercury results in 19 water samples collected April-June 2020
• Josh Sussman, Supervisory Chemist (jsussman@usgs.gov) (303) 236-3209
• Lisa Olsen, Water-Quality Specialist Acting WMA QMS Manager Laboratory & Analytical Services Division (ldolsen@usgs.gov)(703) 648-5809

20-01 | August 31, 2020

• Requirements for the Proper Shipping of Samples to the National Water Quality Laboratory
• Milton Marshall, Chief, Support Services Section (memarsha@usgs.gov) (303) 236-3715
• Mark Cree, Login Supervisor (mecree@usgs.gov) (303) 236-3181

19-02 | May 1, 2019

• New instrument validation of Shimadzu TOC-L, carbon analyzer using acidification with NDIR method of disolved inorganic carbon (DIC) in water samples
• Sara Breitmeyer (sbreitmeyer@usgs.gov) (303) 541-3082
• Julie Ray (jlawrenc@usgs.gov) (303) 236-3247
• Carl Harris (cmharris@usgs.gov) (303) 236-3499
• Heather Miller (hmiller@usgs.gov) (303) 236-3189

19-01 | February 19, 2019

• Acid Matrix study tech memo Characterization of bias and variability in dissolved trace elements determined by inductively coupled plasma–mass spectrometry (ICP-MS) attributable to a deviation in the acid concentration of calibration standards during a period starting no earlier than October 2005 and as late as 2008, and ending August 8, 2015
• Attachment 1 percent change vs concentration
• Attachment 2
• Attachment 3
• Attachment 4 Matched Pairs Stat Test
• Attachment 5 Matched Pairs Spl Only Stat Tests
• Sarah J. Stetson (303) 236-3277 (sstetson@usgs.gov)

18-02 | April 30, 2018

• Validation of high-temperature catalytic oxidation carbon analyzers for analysis of organic carbon in water samples
• Heather Miller (303) 236-3189 (hmiller@usgs.gov)
• Julie Ray (303) 236-3247 (jlawrenc@usgs.gov)
• Cecilia O'Connor (303) 236-3142 (coconnor@usgs.gov)

18-01 | October 01, 2017

• Validation of inductively-coupled plasma mass spectrometer instruments for analysis of trace metals in unfiltered-water and filtered-water samples
• Sarah J. Stetson (303) 236-3277 (sstetson@usgs.gov)
• Heather Miller (303) 236-3189 (hmiller@usgs.gov)

17-01 | March 28, 2017

• Modification to the reporting of elemental results for whole-water recoverable (WWR) sample analyses with old and new laboratory and method codes
• Sarah J. Stetson (303) 236-3277 (sstetson@usgs.gov)
• John R. Garbarino (retired)
• Supersedes TM 2015.01, May 01, 2015

16-02 | August 19, 2016

• Changes to detection levels, reporting levels, and data-reporting conventions for steroid hormones and other analytes in water, solids, and suspended sediment for National Water Quality Laboratory schedules 2434, 4434, 6434, and 7434
• William T. Foreman (303) 236-3942 (wforeman@usgs.gov)
• Patricia L. Toccalino (916) 278-3090 (ptocca@usgs.gov)
• Rhiannon C. ReVello (303) 236-3258 (rcrevell@usgs.gov)

16-01 | August 12, 2016

• Validation of a Radiometer Analytical 870 Titrator and SAC 950 sample changer for alkalinity and acid-neutralizing capacity measurements
• Dana Erickson (303) 236-3939 (derickson@usgs.gov)
• Teresa L. Kirschling (303) 236-3177 (tkirschling@usgs.gov)

15-02 | Jun 4, 2015

• Changes to National Water Quality Laboratory (NWQL) procedures used to establish and verify laboratory detection and reporting limits
• Teresa Williams (303) 236-3482 (twilliams@usgs.gov)
• William Foreman (303) 236-3942 (wforeman@usgs.gov)

15-01 | May 01, 2015

• Modification to the reporting of elemental results for whole-water recoverable (WWR) sample analyses
• Sarah J. Stetson (303) 236-3277 (sstetson@usgs.gov)

14-01 | October 01, 2014

• Reduction in the use of sample-weight-based scaling of reporting levels for National Water Quality Laboratory methods for organics in solids and sediments
• William T. Foreman (303) 236-3942 (wforeman@usgs.gov)

13-01 | November 20, 2013

• Procedure used to correct axial-view lithium results determined by inductively coupled plasma – optical emission spectrometry (ICP-OES)
• John R. Garbarino (303) 236-3945 (jrgarb@usgs.gov)

12-01 | December 27, 2011

• Application of the Result-level "v" Value Qualifier Code and "E" Remark Code to Selected Organic Results Reported by the National Water Quality Laboratory (NWQL)
• Donna N. Myers (labhelp@usgs.gov)

11-02 | July 15, 2011

• Removal of bisphenol A, pentachlorophenol, and bisphenol A-d3 surrogate from laboratory schedule (LS) 1433; removal of bisphenol A and bisphenol A-d3 surrogate from LS 2249; and removal of benzidine from LS 1383; suggested alternative analytical schedules; and data reload
• Sonja R. Abney (srabney@usgs.gov),(303) 236-3284
• Steven G. Smith (sgsmith@usgs.gov),(303) 236-3275
• Douglas L. Stevenson (dstevens@usgs.gov),(303) 236-3762
• Donna L. Damrau (dldamrau@usgs.gov),(303) 236-3183
• Thomas J. Bushly (tjbushly@usgs.gov),(303) 236-3722

11-01 | May 06, 2011

• Requirements for the Proper Shipping of Samples to the National Water Quality Laboratory
• Pat Alex (paalex@usgs.gov),(303) 236-3181, Support Services Section, USGS, National Water Quality Laboratory
• Phil Grano (pwgrano@usgs.gov),(303) 236-3707, Support Services Section, USGS, National Water Quality Laboratory

07-03 | June 01, 2007

• Data reload for Hexahydrohexamethylcyclopentabenzopyran (HHCB) and Acetyl-hexamethyl-tetrahydronaphthalene (AHTN) by Gas Chromatography/Mass Spectrometry reported in NWQL schedules 1433, 4433, 5433, and custom lab codes 8033, 8043, 8050, 8066, 8068, and 8417
• Duane Wydoski (dwydoski@usgs.gov),(303) 236-3240, Analytical Services Section, USGS, National Water Quality Laboratory

07-02 | May 31, 2007

• Removal of Selected Pesticides and Degradation Products from Schedule 2060
• Bruce Anderson, Analytical Services Section,USGS, National Water Quality Laboratory

07-01 | January 31, 2007

• Turbidity Method History
• Glenda E. Brown (gebrown@usgs.gov), (303)236-3160, Business Development Team, USGS, National Water Quality Laboratory

06-01 | May 3, 2006

• Review of method performance and improvements for determining wastewater compounds (Schedule 1433)
• Steven D. Zaugg (sdzaugg@usgs.gov) and Thomas J. Leiker, USGS, National Water Quality Laboratory

05-03 | February 3, 2005

• Changes in reporting levels and data qualifiers for selected pesticides and degradation products in schedule 2060
• Mark R. Burkhardt, (mrburk@usgs.gov) Ron Brenton, and Edward T. Furlong (efurlong@usgs.gov),USGS, National Water Quality Laboratory

05-02 | February 3, 2005

• Revision of the procedure for requesting laboratory matrix spikes
• Michael Schroeder (schroede@usgs.gov), (303)236-3270, Analytical Services Program,USGS, National Water Quality Laboratory

05-01 | February 1, 2005

• Change in method for determination of potassium from flame atomic absorption (FAA) to inductively coupled plasma-optical emission spectrometry (ICP-OES)
• Jeffrey W. Pritt (jwpritt@usgs.gov), (303)236-3475, Metals Section,USGS, National Water Quality Laboratory

03-01 | February 28, 2003

• Data-reporting conventions and implications for interpreting results from custom method 9060 for samples collected from March 1, 1999, to December 31, 1999
• Edward T. Furlong, (efurlong@usgs.gov), MRDP, NWQL (303)236-3941, Joel Blomquist, Pesticide National Syntheses Team NWAQA, USGS, Robert J. Gilliom, USGS

02-04 Septemer 23, 2002

• Requirements for the proper shipping of samples to the National Water Quality Laboratory
• Will Lanier, Chief, Support Services Section, NWQL (303) 236-3710, (wdlanier@usgs.gov)

02-03 | August 12, 2002

• Permanent application of the Estimated (E) Remark Code for Malathion and Disulfoton data reported by Lab Schedule 1319 (Organophosphate Pesticides in Water)
• Duane Wydoski, GC/Waters Unit Supervisor, Analytical Services, NWQL (303) 236-3240, (dwydoski@usgs.gov)

02-02 | May 22, 2002

• Revision of the Procedure Used to Calculate Concentrations of Chlorophyll a and b in Phytoplankton and Periphyton by High-Performance Liquid Chromatography
• Ronald W. Brenton, Analytical Services, NWQL

02-01 | April 26, 2002

• Removal of Terbuthylazine from Pesticide Analysis by Gas Chromatography/Mass Spectrometry (Methods 2001 abd 2010)
• Christopher Lindley, Analytical Services, NWQL (303) 236-3272, (clindley@usgs.gov)

01-05 | December 26, 2001

• Establishment of Long-Term Method Detection Levels for the Analysis of Oil and Grease
• Ronald W. Brenton, Analytical Services, NWQL,USGS

01-04 | November 7, 2001

• Results for Filtered and Whole-Water Recoverable Aluminum and Zinc by ICP-MS Affected by Contamination from May 2000 through September 2000
• Tedmund M. Struzeski, Analytical Services, NWQL, USGS

01-03 | April 27, 2001

• Change in the Long-Term Method Detection Level and the Laboratory Report for Total Recoverable Phenol Analyses, because of Excessive Variability
• Ronald W. Brenton, Analytical Services, NWQL, USGS

01-02 | April 1, 2001

• Recalculation of bromide concentration (lab code 1246)
• Pat Pavelich, Analytical Services Section, NWQL ,USGS

01-01 | May 8, 2001

• Elimination of National Water Quality Laboratory Blank Schedule 172 (Effective June 1, 2001)
• Glenda E. Brown, Supervisory Chemist, Majors Unit, NWQL, USGS, (303) 236-3160, (gebrown@usgs.gov)

00-07 | October 1, 2000

• Elimination of Lead Analysis by Inductively Coupled Plasma-Optical Emission Spectrometry
• Edward J. Zayhowski, Supervisory Chemist, Plasma Unit, NWQL

00-06 | October 1, 2000

• Elimination of Orthophosphate and Nitrate Analysis by Ion Chromatography
• Gary Cottrell, Nutrient Unit Supervisor, Inorganic Program, NWQL (303) 236-3490, (cottrell@usgs.gov)

00-04 | July 25, 2000

• Hach Turbidimeter 2100AN to replace Hach Turbidimeter 2100A for determination of turbidity in raw unfiltered water.
• Glenda E. Brown, Supervisory Chemist, Majors Unit, NWQL, (303) 236-3160 (gebrown@usgs.gov)

00-04S | July 25, 2000 - Supplementary Information

• Hach Turbidimeter 2100AN to replace Hach Turbidimeter 2100A for determination of turbidity in raw unfiltered water.
• Glenda E. Brown, Supervisory Chemist, Majors Unit, NWQL, (303) 236-3160 (gebrown@usgs.gov)

00-03 | March 8, 2000

• Changes in Minimum Reporting Levels for Suspended Solids Analyses at the NWQL (Lab Codes 49 and 169).
• Gary Cottrell, Nutrient Unit Supervisor, NWQL, (303) 236-3490 (cottrell@usgs.gov)

00-02 | February 17, 2000

• Re-release of Total Phosphorus (labcodes 1983, 1984, 1992) data for results from 10/01/98 to 01/21/99
• Gary Cottrell, Inorganic Program, NWQL, (303) 236-3490 (cottrell@usgs.gov)

00-01 | January 7, 2000

• Update on blank correction omission for Kjeldahl nitrogen and phosphorus test on samples sent to the National Water Quality Laboratory
• Gary Cottrell, Inorganic Program, National Water Quality Laboratory, (303) 236-3490 (cottrell@usgs.gov)

00-01S January 7, 2000 - Supplementary Information

• Analysis and interpretation of reporting environmental data with a non-proper calibration curve for Kjeldahl nitrogen and phosphorus methods
• Jeff Pritt, National Water Quality Laboratory (303) 236-3475 (jwpritt@usgs.gov)

99-10 | December 17, 1999 [Memo distributed March 9, 2000]

• Consolidation of aroclor 1016 and aroclor 1242 in lab schedules 1608 (NPDES organochlorine pesticides with individual PCB aroclors in water) and 1364(individual PCB aroclors in water)

99-09 | December 17, 1999 [Memo distributed March 9, 2000]

• Removal of Two Constituents from Lab Schedules 1324 (Organochlorine Pesticides in water and 1398 (Low-Level Organochlorine Pesticides in water) and Addition of One or Two Surrogates to Lab Schedules 1324, 1364 (Polychlorinated Biphenyls in Water), 1398, and 1608 (Organochlorine Pesticides in Storm Water Run-off)
• Leslie Kanagy, Organic Program, National Water Quality Laboratory, (303) 236-3243 (lkkanagy@usgs.gov)

99-08 | November 1, 1999

• Method Change for the Determination of Phytoplankton Biomass
• Ronald W. Brenton, Organic Program, National Water Quality Laboratory

99-07 | May 12, 1999

• New Analytical Services Request Procedures for National Water-Quality Assessment Program Invertebrate Samples Shipped to the National Water Quality Laboratory
• Stephen R. Moulton II, Supervisory Biologist, National Water Quality Laboratory (303) 236-3493 (smoulto@usgs.gov)
• Robert S. Williams, Jr, Chief, National Water Quality Laboratory
• Timothy L. Miller, Chief, National Water Quality Assessment Program (703) 648-6868 (tlmiller@usgs.gov)

99-06 | July 7, 1999

• Change in the Parameter Code Used to Report Results for Chloramben Herbicide
• Ronald W. Brenton, Organic Program

99-05 | January 7, 1999

• Validation of U.S. Environmental Protection Agency (USEPA) method 365.1 to replace U.S. Geological Survey (USGS) TWRI methods I-2607-90 and I-4607-90 for determination of phosphorus in the concentration range from 0.004 to 0.200 mg-P/L.
• Juan Vasquez, Supervisory chemist, Nutrients Unit, Inorganic Chemistry Program
• Charles Patton, Research Chemist. Methods Research and Development Program, NWQL, (cjpatton@usgs.gov, 303-236-2000)

99-04 | April 8, 1999

• Inductively Coupled Plasma - Optical Emission Spectrometry to replace Flame Atomic Absorption Spectrometry and Direct Current Plasma - Atomic Emission Spectrometry for the determination of whole-water recoverable trace metals and major ions in digested water samples
• Edward J. Zayhowski, Supervisor, Plasma Unit, Inorganic Chemistry Program, NWQL
• Tedmund M. Struzeski, Chemist, Plasma Unit, Inorganic Chemistry Program, NWQL

99-03 | October 14, 1998

• Analysis of Total Phenols
• Ronald W. Brenton, Organic Program (303) 236-2000

99-02 | October 6, 1998

• Disposal of National Water-Quality Assessment (NAWQA)Program Depositional Targeted Habitat (DTH) benthic macroinvertebrate samples
• Timothy L. Miller, Chief, NAWQA, (tlmiller@usgs.gov, 703-648-6868)
• Robert S. Williams, Jr., Chief, NWQL
• Stephen R. Moulton, II, Biological Unit Invertebrate Specialist, NWQL (smoulto@usgs.gov, 303-236-2000)

99-01 | October 8, 1998

• Change in reporting unit for relative abundances of helium isotopes
• L. Niel Plummer, Eastern region Branch of Regional Research (703) 648-5841, (nplummer)
• Ann H. Mullin, Analytical Contracting Unit, NWQL, (303) 236-2000 (ahmullin)

98-12 | September 29, 1998

• Graphite Furnace Atomic Absorption Spectrophotometry(GFAAS) to replace Hydride Generation Atomic Absorption Spectrophotometry (HGAAS) for the Determination of Antimony in Filtered and Whole Water Recoverable Water Samples
• Glenda E. Brown, Supervisory Chemist, Majors Unit, Inorganic Chemistry Program (303) 236-2000 (gebrown@usgs.gov)

98-11 | September 30, 1998

• Graphite Furnace Atomic Absorption Spectrophotometry (GFAAS) to replace Hydride Generation Atomic Absorption Spectrophotometry (HGAAS) for the Determination of Arsenic and Selenium in Filtered and Whole Water Recoverable Water, and Recoverable Bottom Material Sediment
• Glenda E. Brown, Supervisory Chemist, Majors Unit, Inorganic Chemistry Program (303) 236-2000 (gebrown@usgs.gov)

98-10 | August 12, 1998

• National Water Quality Laboratory, Biological Unit availability to process benthic Macroinvertebrate samples for the Water Resources Division
• Robert S. Williams, Jr., Chief, NWQL
• Timothy L. Miller, Chief, NAWQA, (tlmiller@usgs.gov, 703-648-6868)
• Stephen R. Moulton II, BU Invertebrate Specialist, NWQL (smoulto@usgs.gov)
• Gary Cottrell, BU Acting Supervisor, NWQL (cottrell@usgs.gov, 303-236-2000)

98-09 | April 30, 1998

• Invertebrate Sample Field Processing and Shipment to the NWQL
• Timothy L. Miller, Chief, NAWQA, (tlmiller@usgs.gov, 703-648-6868)
• Robert S. Williams, Jr., Chief, NWQL

98-08 | September 29, 1998

• Change in the Analytical Method Used for the Determination of Inorganic Carbon in Sediment
• Ronald W. Brenton, Organic Chemistry Program, NWQL

98-07 | October 1, 1998

• Reporting Level Changes for Volatile Organic Compounds (Schedules 2020/2021), Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES), Ammonia plus Organic Nitrogen and Phosphorus (micro-Kjeldahl) in Water Methods at the National Water Quality Laboratory
• Bill Foreman, Research Chemist, Methods Research and Development Program, NWQL (wforeman@usgs.gov, 303-236-2000)
• Brooke Connor, VOC/Sediment Unit Supervisor, Organic Chemistry Program, NWQL (bfconnor@usgs.gov, 303-236-2000)
• Tom Maloney, Chief, Quality Management Program, NWQL

98-06 | April 28, 1998

• Elimination of Acrolein from NWQL Schedules 2020, 2021 and Deletion of Schedule 1401
• Donna L. Rose, Chemist, Volatiles Unit 303-236-2000, dlrose@usgs.gov
• Brooke F. Connor, Supervisory Chemist, Volatiles Unit, Organic Program, 303-236-2000, bfconnor@.usgs.gov

98-05 | December 9, 1997

• Changes in Minimum Reporting Levels for Inductively Coupled Plasma - Atmonic Emission Spectrometry
• Tom Maloney, Quality Management Program Chief, NWQL

98-04 | December 9, 1997

• Changes in Minimum Reporting Levels for Solids Analyses at the NWQL (Lab Codes 159, 165, 27, 229, and 85) and Request for Information on the Need to Develop Lower Level Methods
• Tom Maloney, Quality Management Program Chief, NWQL

98-03 | August 28, 1998 - Revision A

• Changes in Reporting Levels and Data Qualifiers for Selected Pesticides and Degradation Products in Schedules 2050 and 2051
• Bill Foreman, Methods Research & Development Program, (303) 236-2000, wforeman@usgs.gov
• Bob Gilliom, Chief, NAWQA Pesticide Synthesis Team, (916) 278-3094, rgilliam@usgs.gov

98-03S | August 28, 1998 - Supplementary Information - Revision A

• Changes in Reporting Levels and Data Qualifiers for Selected Pesticides and Degradation Products in Schedules 2050 and 2051
• Bill Foreman, Methods Research & Development Program, (303) 236-2000, wforeman@usgs.gov
• Bob Gilliom, Chief, NAWQA Pesticide Synthesis Team, (916) 278-3094, rgilliam@usgs.gov

98-02 | December 8, 1997

• Reporting Changes for Selected Organochlorine Constituents from Schedule 1325 (Insecticides and Gross PCBs in Bottom Material) and Schedule 1335 (Organochlorine Insecticides, Gross PCBs, and Organophosphate Insecticides in Bottom Material) - Minimum Reporting Levels, Qualified Data, Surrogates, and Elimination of Two Constituents
• Brooke Connor, Sediments and Tissue Unit Supervisor, (303) 236-2000, bfconnor@usgs.gov
• Dawn Hrinko, Analytical Chemist, Organics Program
• Bill Foreman, Methods Research & Development Program, (303) 236-2000, wforeman@usgs.gov

98-01 | November 10, 1997

• Change in Ammonia plus Organic Nitrogen Minimum Reporting Level
• Charles J. Patton, Methods Research & Development Program, (303) 236-2000, cjpatton@usgs.gov, &log; Juan Vasquez, Supervisor, Nutrients Unit

97-12 | August 8, 1997

• Implementation of Method-O-7100-96 Determination of Nonpurgeable Suspended Organic Carbon by Wet-chemical Oxidation and Infrared Spectrometry
• Ronald W. Brenton, Organic Program

97-11 | July 29, 1997

• New Approved Method for VOCs
• Brooke F. Connor, Supervisory Chemist, Volatiles Unit, Organics Program (bfconnor@usgs.gov)

97-10 | June 20, 1997

• Change in Ammonia Minimum Reporting Limit
• Charles J. Patton, Methods Research & Development Program (303) 236-2000, cjpatton@usgs.gov

97-09 | June 11, 1997

• Replacement or Elimination of NWQL Procedures
• Peter F. Rogerson, Chief, NWQL
• Harold Ardourel, Ass't Chief, Inorganics (ardourel) (303)236-2000
• Ralph White, Ass't Chief, Organics

97-08 | April 1, 1997

• Changes to the NWQL's Data Formatting and Transmittal Software
• Richard A. Husband, Computer Services Unit
• Linda K. Pratt, Chief, Laboratory Operations

97-07 | March 26, 1997

• Replacement Chemical Oxygen Demand Instrumentation Operational
• Glenda Brown, Inorganic Program (303) 236-2000 (gebrown@usgs.gov)

97-06 | March 26, 1997

• Retrieving Data from the National Water Quality Laboratory-- PR1ME Version
• Steve Glodt, Computer Services Unit

97-05 | February 28, 1997

• Using the National Water Quality Laboratory for the analysis of drinking water samples
• Al Driscoll (driscoll@usgs.gov)
• Carmen Reed-Parker (cgreed@usgs.gov)
• Kathy Bryant (kmbryant@usgs.gov), Quality Assurance Unit, (303) 236-2000

97-04 | April 7, 1997

• Tritium/helium dating of ground-water samples available through contract with Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York
• L. Niel Plummer, Eastern Region Branch of Regional Research, (703) 648-5841, (nplummer@usgs.gov)
• Ann Mullin, Chief, Radiochemistry Unit, NWQL (303) 236-2000, (ahmullin@usgs.gov)

97-04S | April 7, 1997 - Supplementary Information

• Collection, processing, and analysis of ground-water samples for tritium/helium-3 dating
• L. Niel Plummer, Eastern Region Branch of Regional Research, (703) 648-5841, (nplummer@usgs.gov)
• Ann Mullin, Chief, Radiochemistry Unit, NWQL (303) 236-2000, (ahmullin@usgs.gov)

97-03 | February 28, 1997

• Automated Data Transmission of All 25 Schedule 1379 Pesticides
• Jim Madsen, Organic Program (303) 236-2000 (jemadsen@usgs.gov)

97-02 | November 25, 1996

• Proposed Replacement or Elimination of NWQL Procedures
• Peter F. Rogerson, Chief NWQL

97-01 | November 5, 1996

• Use of Syringes to Add Volatile Organic Compounds to Water Samples for Use as Matrix Spike Samples
• Mark W. Sandstrom, Chief, Methods Research & Development Program (sandstro@usgs.gov) (303) 236-2000
• Bruce R. Darnel, Quality Management Program (brdarnel@usgs.gov) (303) 236-2000

97-01S | November 5, 1996 - Supplementary Information

• Use of Syringes to Add Volatile Organic Compounds to Water Samples for Use as Matrix Spike Samples
• Mark W. Sandstrom, Chief, Methods Research & Development Program (sandstro@usgs.gov) (303) 236-2000
• Bruce R. Darnel, Quality Management Program (brdarnel@usgs.gov) (303) 236-2000

96-12 | September 25, 1996

• Change in the calculation of values for inorganic carbon, total in bottom material
• Ronald W. Brenton, Organic Program

96-11 | June 6, 1996

• Changes in reporting of gross alpha and gross beta results
• Ann Mullin, Chief, Radchem Unit (303) 236-2000 (ahmullin@usgs.gov)

96-10 | May 22, 1996

• Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) to replace Direct Current Plasma-Atomic Emission Spectrometry (DCP-AES) for the determination of dissolved Aluminum and Boron in water
• Tedmund M. Struzeski, Chemist, Plasma Unit, Inorganic Chemistry Program (struzesk@usgs.gov)

96-09 | May 22, 1996 | SUPERSEDED by NWQL 1996-12 (September 25, 1996)

• Changes in reporting of gross alpha and gross beta results
• Ann Mullin, Chief, Radchem Unit (303) 236-2000 (ahmullin@usgs.gov)

96-08 | May 22, 1996

• Implementation of EPA Method 1664 for the Analysis of Oil and Grease or Total Petroleum Hydrocarbons in water
• Ronald W. Brenton, Organic Program

96-07 | May 22, 1996

• Qualification of Data for Five Compounds on Laboratory Schedules 2050 and 2051
• Ronald W. Brenton, Organic Program

96-06A | April 15, 1996

• Revised Method Detection Limits for Pesticide Schedules 2001/2010 and 2050/2051
• Steven R. Glodt, Computer Specialist

96-05 | April 5, 1996

• Collection, processing, and analysis of carbon isotope samples
• Tyler B. Coplen, BRR Reston (tbcoplen@usgs.gov), 703-648-5862
• L. Niel Plummer, BRR Reston (nplummer@usgs.gov), 703-648-5841
• Ann Mullin, NWQL (ahmullin@usgs.gov), 303-236-2000

96-04 | March 20, 1996

• Inductively Coupled Plasma-Atomic Emission Spectrometry to replace Flame Atomic Absorption Spectrometry for the determination of dissolved trace metals and major ions in filtered acidified water samples and the effects of this change
• Jack DeGiacomo, Majors Unit, Inorganic Program

96-03 | March 20, 1996

• Change of Reporting Levels for National Water Quality Laboratory Analytical Schedule 1359--Carbamate Pesticides by Liquid/Liquid Extraction and Liquid Chromatographic Analysis
• Ronald W. Brenton, Organic Program

96-02 | October 23, 1995

• Lower Your Costs--Choose the right volatiles schedule.
• Brooke F. Connor, Supervisor, Volatiles Unit, Organic Program (bfconnor@usgs.gov)

96-01 | October 23, 1995

• Guidelines for Labeling 40-mL Volatiles Sample Vials
• Brooke F. Connor, Supervisor, Volatiles Unit, Organic Program (bfconnor@usgs.gov)

95-11 | September 6, 1995

• Submission of samples for analysis by the NRP Isotope Tracers Project in Menlo Park
• Thomas J. Maloney, Chief, Quality Mgmt. Program, (303) 236-2000
• Carol Kendall, Chief, NRP Isotope Tracers Project, (415) 329-4538 ckendall@usgs.gov

95-10 | September 13, 1995

• Overview of the QA/QC plan for the Radchem/Stable Isotope contracts at the NWQL
• Ann H. Mullin, Supervisory Radchem Unit Chemist, (303) 236-2000, ahmullin@usgs.gov

95-09 | August 25, 1995

• Discontinuation Of Automatic Swapping
• Linda K. Pratt, Chief, Laboratory Operations, NWQL

95-08 | August 9, 1995

• Return and reimbursement for 250-ml FAB teflon bottles in the field.
• Harold Ardourel, Acting Assistant Chief, Inorganic Program, NWQL, (303) 236-2000, ardourel@usgs.gov

95-07 | May 25, 1995

• Submission of samples for analysis by the NRP Isotope Fractionation Project in Reston
• Thomas J. Maloney, Chief, Quality Mgmt. Program, (303) 236-2000
• Tyler Coplen, Chief, NRP Isotope Fractionation Project, (703) 648-5862, tcoplen@usgs.gov

95-06 | May 3, 1995

• Use of one filtered, acidified (FA) bottle for trace metal and other cations for the inorganic protocol
• Harold Ardourel, Assistant Chief, Inorganic Program, (303) 236-2000 ardourel@usgs.gov

95-05 | March 8, 1995

• Nitrogen Isotope Sample Preservation for Water Samples
• Jeanne Hatcher, Radchem Unit, Quality Management Program, NWQL jhatcher@usgs.gov, 236-2000

95-04 | December 2, 1994 | SUPERSEDED by NWQL 2002-04 (September 23, 2002)

• Shipping Samples to the National Water Quality Laboratory
• Linda K. Pratt, Chief, Lab Operations, NWQL

95-03 | October 14, 1994

• Graphite Furnace Atomic Absorption Spectrophotometry to replace Atomic Absorption Spectrometric, Chelation-extraction for the determination of molybdenum in water
• Betty McLain, LIS Unit, Inorganics Program, NWQL

95-02 | October 14, 1994

• Separate Analytical Services Request Form Suggested for Trace Element ppb Protocol
• Peter Rogerson, Chief, NWQL

95-01 | October 14, 1994

• National Water Quality Laboratory Alkalinity Reanalysis Policy
• James L. Pilon & Kailin Terry, Quality Management Program, NWQL

94-13 | August 25, 1994

• National Water Quality Laboratory Reporting Level for the Oil and Grease in Bottom Material Analysis
• Ronald W. Brenton, Organic Program (303)236-2000

94-12 | July 8, 1994

• Description and guide for interpreting low-level data supplied by the NWQL for schedules 2001, 2010, 2050, and 2051
• Jeffrey W. Pritt, Quality Mgmt. Program (jwpritt@usgs.gov) (303) 236-2000

94-11 | May 4, 1994

• New prices and lab codes for sulfur isotope (delta-34 S) analysis
• Ann Mullin, Radchem Unit, Quality Management Program (ahmullin@usgs.gov) (303) 236-2000

94-10 | April 12, 1994

• Change in decay calculations at the University of Miami Tritium Laboratory - Change in oxygen isotopic data at the Reston Stable Isotope Laboratory
• Ann Mullin, Radchem Unit (ahmullin@usgs.gov) (303) 236-2000

94-09 | March 4, 1994

• Calculation error on mercury bottom material data
• Glenda E. Brown (gebrown@usgs.gov) (303) 236-2000

94-08 | March 4, 1994

• Availability of ICP-MS and a comparison of its analytical capabilities with more established techniques
• John R. Garbarino (303) 236-2000 (jrgarb@usgs.gov)

94-07 | February 10, 1994

• Description and use by districts of Laboratory QC sample information in organic determinations
• Mark Sandstrom (303) 236-2000 (sandstro@usgs.gov)

94-06 | January 24, 1994

• Limitation in the determination of selected carbamate pesticides in water
• Bill Foreman (wforeman@usgs.gov), Methods Research & Development
• Marvin Fishman

94-05 | January 5, 1994

• Availability of a new Analysis for the Quantitation of Glyphosate Herbicide
• Mike Schroeder (303) 236-2000 (SCHROEDE)

94-04 | December 30, 1993

• Graphite Furnace Atomic Absorption Spectrophotometry to replace Direct-Current Plasma Atomic Emission Spectrometry for the determination of chromium in water
• Betty J. McLain

94-03 | December 22, 1993

• Change in Method for Determining Chloride, Sulfate, and Fluoride
• Peter F. Rogerson,Chief, NWQL

94-02 | December 10, 1993

• NWQL Policy on pH Analytical Determinations
• Harold Ardourel (303) 236-2000 ardourel@usgs.gov
• Thomas J. Maloney

94-01 | October 18, 1993

• Discontinuance of analysis of unfiltered (raw) water samples for radionuclides by the National Water Quality Laboratory (NWQL) - Discontinuance of analysis of unfiltered, acidified samples for total uranium
• Ann Mullin, Radiochemistry Unit (303) 236-2000 (ahmullin@usgs.gov)

93-10 | August 25, 1993

• Interferences in the Methylene Blue Active Substances [MBAS] Method, Techniques of Water-Resources Investigation [TWRI], [0-311-83], Book 5, Chapter A3.
• Mark Burkhardt, Methods Research & Development Program (303) 236-2000 (mrburk@usgs.gov)
• Jeff Pritt, Quality Management Group (303) 236-2000 (jwpritt@usgs.gov)

93-09 | August 24, 1993

• Radon - Discontinuance of duplicate samples for radon-in-water. - Change in window setting for analysis.
• Ann H. Mullin, Radchem Section Chief (303) 236-2000 (ahmullin@usgs.gov)

93-08 | May 26, 1993

• New Inorganic Tissue Method
• Merle W. Shockey, Inorganic Program Chief (303) 236-2000 (mshockey@usgs.gov)

93-07 | March 15, 1993

• Problems with Laboratory pH analytical determinations
• Harold Ardourel (303) 236-2000 (ardourel@usgs.gov)

93-06 | March 11, 1993

• Raising the method detection limit for gross alpha and gross beta
• Ann H. Mullin, Radchem Section Chief (303) 236-2000 (ahmullin@usgs.gov)

93-05 | March 10, 1993

• Establishment of one analytical range for silica method
• Harold Ardourel (303) 236-2000 (ardourel@usgs.gov)

93-03 | December 28, 1992 | SUPERSEDED by NWQL 1994-03 (December 22, 1993)

• Change in method for the determination of chloride in water due to data quality problems
• Charlie Patton (cjpatton@usgs.gov)
• Gary Cottrell (cottrell@usgs.gov)
• Jeff Pritt (jwpritt@usgs.gov)

93-02 | October 5, 1992

• Review process for samples analyzed at the National Water Quality Laboratory (NWQL)
• Dariel Blackburn, Quality Management Group

93-01 | October 5, 1992

• Identification of Low Levels of Sodium Contamination in Nitric Acid Samples
• Jeff Pritt, Quality Management Group, NWQL (303) 236-2000 (jwpritt@usgs.gov)

92-07 | August 12, 1992

• Change of Sample Type Requirement for Ion Chromatography Analysis
• Harold Ardourel, Inorganic Program (303) 236-2000 (ardourel@usgs.gov)

92-06 | August 12, 1992 | SUPERSEDED by NWQL 2002-04 (September 23, 2002)

• District Rerun Requests
• Quality Management Group

92-05 | August 12, 1992

• New Nitrogen-15/Nitrogen-14 Lab Codes
• Ann Mullin, (ahmullin@usgs.gov)

92-04 | August 12, 1992

• Bottles for Tritium Analyses
• Ann Mullin, (ahmullin@usgs.gov)

92-03 | August 12, 1992

• Mercuric Chloride Preservation of S-34/S-32, O-18/O-16, and H-2/1-1-1 Samples
• Ann Mullin, (ahmullin@usgs.gov)

92-02 | May 29, 1992

• Reimbursement for Deleted Lab Requests

92-01 | March 25, 1992

• Technology Transfer.- AVAILABILITY OF EQUIPMENT BLANK WATER FOR INORGANIC & ORGANIC ANALYSIS