Revision History for U.S. Geological Survey Techniques and Methods; Book 9, Handbooks for Water-Resources Investigations; Section A, National Field Manual for the Collection of Water-Quality Data; Chapter 1, Preparations for Water Sampling U.S. Geological Survey Preparations for Water Sampling ----------------------------------------------------- Posted online - first release: 1998, as Techniques of Water-Resources Investigations (TWRI), book 9, chapter A1, version 1.0 ----------------------------------------------------- Revised: 2005, online as TWRI, book 9, chapter A1, version 2.0 The authorship was changed and the report was updated. ----------------------------------------------------- Revised and reposted November 27, 2018, online as Techniques and Methods (T&M), book 9, chapter A1 U.S. Geological Survey, 2018, Preparations for water sampling: U.S. Geological Survey Techniques and Methods, book 9, chap. A1, 42 p., https://doi.org/10.3133//tm9A1. [Supersedes USGS Techniques of Water-Resources Investigations, book 9, chap. A1, ver. 2.0.] The personal authors were changed to the agency, U.S. Geological Survey. The report series was changed as indicated above. The layout was revised to match the current style and format of a USGS series report, and the text was set in two columns. A back cover was added, and the front cover, title page, back-of-title page, and abstract were revised to include the following: the change of series (to a T&M), the change in authorship, and a statement that this 2018 release of chapter A1 in the T&M series supersedes TWRI, book 9, chapter A1, version 2.0. Substantive changes made in book 9, chapter A1, in 2018 are summarized below. Added: Section on site selection in tidally affected waters Section on the Personal Computer Field Form (PCFF) Section on the Project Work Plan Laboratory analytical service request form (ASR) links and Laboratory Evaluation Program information Section on safety Updated and expanded: NWIS SITEFILE information Quality Assurance Plan (QAP) information Project Data-Management Plan information Station and Project File requirements