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Table 3. Selection, design, and documentation criteria for wells used in National Water-Quality Assessment Program Study-Unit Surveys, Land-Use Studies, and Flowpath Studies--Continued The well-selection process, including criteria used and their order of application. Map(s) and site description(s) that clearly indicate the location of the well. Well and aquifer characteristics that must be entered into the Ground Water Site Inventory (GWSI) to establish a site file. To the extent available, additional well and aquifer data that are stored in the Ground Water Site Inventory. Site and sampling information required for storage of sample analyses in the Water-Quality data base (QWDATA). Written permission of the well owner to measure the water level or sample the well, and to release the data. Land-use/land-cover near the well for each well sampled. The form is updated each time a well is sampled if changes in land use/land cover are observed. A series of photographs of each well that is sampled and of its surrounding area. The photo- graphs serve as a record of the local land use and help locate the well and water-level measuring point in the future. Other information, as available, about the well, such as that listed on the well-information check list. Additional Criteria That ARUIX For Study-Unit Surveys Existing water-supply, observation, or monitoring wells are selected. Wells are selected for sampling in a subunit using a grid-based random selection approach (Scott, 1990; Alley, 1993). Select only observation, monitoring, or low-capacity water-supply wells to avoid the complexi- ties of determining contributing areas to high-capacity wells (such wells can draw water from units other than the unit of interest). Well-casing material is Polyvinyl Chloride (PVC) or stainless steel. Wells that are constructed of PVC have threaded, not glued, joints. Well screens are continuous-slot wire-wound screens or machine-slotted casing made of PVC or stainless steel. 10