FIELD GUIDE FOR COLLECTING AND PROCESSING STREAM-WATER SAMPLES FOR THE NAWQA PROGRAM

By Larry R. Shelton

U.S. Geological Survey Open-File Report 94-455

Summary of July 1996 revisions to the published report;

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Equipment Cleaning (page 13)

Additional field and laboratory testing, as well as field blanks, have confirmed that an aggressive equipment cleaning is not always required. The new instructions recommend two cleaning procedures. An aggressive laboratory cleaning for new and contaminated equipment and an abbreviated field procedure for routine cleaning. When field cleaning, leave the equipment assembled and rinse only with detergents, water, HCL, DIW, and methanol. Soaking is not necessary. See 'Equipment Cleaning' for more detail.

References Cited and Selected Technical Memorandums (pages 40 and 41)

New references have been added;

USGS Open-File Report 94-539, SW Inorganic Protocol
USGS Open-File Report 95-293, Precision of Splitters
USGS Open-File Report 95-399, GW Protocol
USGS Open-File Report 95-4141, Evaluation of Splitters

and OWQ Technical Memorandum, 95.04, Shipping Samples to Laboratory