Skip to main content
U.S. flag

An official website of the United States government

Documents

Electronic technical memoranda released by the NWQL from 1992 to present, and other supporting documents. To access technical memoranda, filter Type by "Technical Memos" below.

Filter Total Items: 143
File icon

TM23-02 Discontinuation of surrogate compound tetrahydrofuran-d8 and addition of surrogate compound 1,3-dioxane to National Water Quality Laboratory schedules 4437 and 4447 that use Method O-4437-16

File icon

TM23-01 Verification of alkalinity and ANC determination using Mantech Automated Titration System

File icon

TM22-03 Alkalinity samples analyzed at the Analytical Trace Element Chemistry and Common Services Laboratory (USGSTECO)

File icon

TM22-04 Revision of results for ammonia by KONE for 817 samples analyzed January – March 2022

File icon

Attachment 1. Original and Corrected Results for NWQL Technical Memorandum 22-04

File icon

TM21-02 Reload of qualified environmental sample results for Ammonia, Nitrite and Orthophosphate by the Kone Method due to loss of scientific integrity

File icon

TM21-02 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

File icon

TM21-02 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.

File icon

TM21-02 Attachment 1: Original and corrected results

File icon

TM21-02 Attachment 4: R Scripts for logic checks applied to revise and qualify the KONE Method results