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ILLUSTRATIONS--Continued Page 9. Example of a form to summarize development of a well .................... 48 10. Examples of well-location and site-sketch maps and information related to site conditions and restrictions ....................................... 50 11. Land-use and land-cover field sheet for the 1991 Study Units, National Water-Quality Assessment Program .............................. 53 12. Example of a form to record water-level data in a well ....................... 57 TABLES Page Table 1. Components and attributes of the National Water-Quality Assessment Program ground-water sampling design ........................... 4 2. Summary of current (1995) required, recommended, and optional water-quality constituents to be measured in the three National Water-Quality Assessment Program ground-water components of the Occurrence and Distribution Assessment ........ 6 3. Selection, design, and documentation criteria for wells used in National Water-Quality Assessment Program Study-Unit Surveys, Land-Use Studies, and Flowpath Studies ......................... 9 4. Advantages and disadvantages of high-capacity and low-capacity water-supply wells for water-quality studies ................................. 14 5. Relative leaching or sorption/desorption ranking of well-casing and screen materials for indicated water-quality constituent classes ... 29 6. Some general characteristics of materials used for well casing and screens ......................................................................................... 30 7. Six-step procedure for decontamination of well-installation equipment and materials ................................................................ 33 8. Factors to consider when selecting a drilling method ......................... 34 9. Summary matrix of relations between drilling criteria and drilling methods ........................................................................................ 35 10. Characteristics of bentonite and cement as annular seals ................... 38 11. Information required for creation of files and storage of water- quality-related data in U.S. Geological Survey data bases within the National Water Information System-1 .......................... 44 12. Summary matrix of relative quality of aquifer property measured or estimated using different sample-collection methods ................ 60 13. Summary matrix of potential applications of borehole-geophysical logs commonly used in ground-water investigation ....................... 62