Quality-control practices have been established for the operation of the U.S. Geological Survey's National Water Quality Laboratory. These practices specify the ways in which samples are preserved, shipped, and analyzed in the laboratory. This manual documents the practices that are currently (1987) used in this laboratory. It is termed an "interim" manual because it is intended to serve as the basis for the development of a more complete and detailed quality assurance plan for the laboratory, to be made possible by the expansion of staff, operations, and data-processing capability, which is currently underway.
Knowledge of the characteristics of highway runoff (concentrations and loads of constituents and the physical and chemical processes which produce this runoff) is important for decision makers, planners, and highway engineers to assess and mitigate possible adverse-impacts of highway runoff on the Nation's receiving waters. In October, 1996, the Federal Highway Administration and the U.S. Geological Survey began the National Highway Runoff Data and Methodology Synthesis to provide a catalog of the pertinent information available; to define the necessary documentation to determine if data are valid (useful for intended purposes), current, and technically supportable; and to evaluate available sources in terms of current and foreseeable information needs. This paper is one contribution to the National Highway Runoff Data and Methodology Synthesis and is being made available as a U.S. Geological Survey Open-File Report pending its inclusion in a volume or series to be published by the Federal Highway Administration. More information about this project is available on the World Wide Web at
Catalog. Please use 1t with your existing binder and dividers. If additional copies are needed, you may request them by EDOC to DENSUPPLY. Reasonable numbers are available at no charge. Several changes will be evident in this catalog. The Method Codes have been added to the WATSTORE Codes, so that you can determine the methodology used for each analysis. The biological parameters have been combined with the organic parameters on Tables 4 and 5, eliminating Tables 4.3 and 5.3. Further modifications to clarify and simplify are anticipated for next year. We would be happy to receive your suggestions for Improvement.
Cover. This block diagram is a generalized representation of surface land uses and underlying deposits in Illinois, Indiana, Michigan, and Ohio. The relatively flat farmland plains and rolling hills conceal a complex mix of glacial deposits stacked above ancient rocky hills and valleys like a pile of rumpled patchwork quilts. During the last 1.8 million years, each glacial advance and retreat modified the previous landscape and deposited new layers of clay, silt, sand, gravel, and till, capped by soil. The thickness of the glacial deposits ranges from a few inches to more than 1,300 feet. Diagram by J.M. Evans, USGS. For additional information on the relations between glacial features and modern land uses and for a depiction of the water table, see a modification of this diagram in the yellow pages, Article 2, Water Resources.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.