2018年6月8日 · Checking the water quality of the Nation's streams, rivers, and lakes is one of the main responsibilities of the U.S. Geological Survey (USGS). Physical water measurements and streamflow are almost always taken, but often water samples are needed for chemical analyses.

2019年2月28日 · The NFM provides detailed, comprehensive, and citable procedures for sampling water resources, processing samples for analysis of water quality, measuring field parameters, and specialized procedures.

2024年5月9日 · This document describes general and specific procedures, methods and considerations to be used and observed when collecting surface water samples for field screening or laboratory analysis.

2019年2月24日 · USGS National Water Quality Assessment (NAWQA) studies require analyses of stream and bed-sediment samples for major ions, nutrients, sediments, and organic contaminants that are consistent across time and space. Procedures have been designed specifically to produce information that is comparable among studies in different parts of the …

The National Field Manual for the Collection of Water-Quality Data (National Field Manual) describes protocols and provides guidelines for U.S. Geological Survey (USGS) personnel who collect data that are used to assess the quality of the …

Some of the various types of QC samples collected by the USGS Illinois Water Science Center are described in the following section. Procedures have been established for the storage of water-quality-control data within the USGS.

S&A involves the collection and analysis of water samples to confirm or rule-out contamination. It involves water quality parameter testing for indicators of contamination, rapid field testing for specific contaminants and contaminant classes, and …

The U.S. Geological Survey (USGS) develops the sampling procedures and collects the data necessary for the accurate assessment and wise management of our Nation’s surface-water and groundwater resources.

Sampling once per year is sufficient for most water-quality monitoring programs. While identification of the macroinvertebrates to order level is generally sufficient to show significant differences between streams (e.g. good vs. poor), resolution

Prepare a Sampling and Analysis Plan (SAP) which describes the sampling locations, numbers and types of samples to be collected, and the quality control requirements of the project. Check with the laboratory before collecting samples to ensure that sampling equipment, preservatives, and procedures for sample collection are acceptable.