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In NWIS-I, water-quality-related data are stored in two data bases: GWSI (Ground- Water Site Inventory), where, for example, well-location and well-construction information are stored; and QWDATA (Quality of Water data), where results of water-quality analyses are stored. Specific minimum information (table 11) is required for creation of a site file and for storage of data in these data bases. Specific minimum information also is required to be re- corded on the USGS NWQL (National Water Quality Laboratory) ASR (Analytical Services Request) form for acceptance of a sample for laboratory analysis by the NWQL. Replacement of NWIS-I by NWIS-II might change some of the data-entry requirements currently mandated. In addition to specific minimum information required for creation of a site file and for storage of data in the GWSI and QWDATA data bases, other site and well-related information should be collected to the extent possible by NAWQA Study Units. Documentation of the methods and materials used for well installation is required for each new well installed and for each existing well selected to the extent that the information is available (fig. 8). Documentation of newly installed wells is to be completed at the time of or directly after well completion and development. Documentation includes lithologic, driller's, and well-construction logs (U.S. Geological Survey, 1980, p. 2-80 to 2-81); and a record of well development (fig. 9). A record should be kept of other logs collected during and after drilling, such as drilling-rate and fluid-loss logs (U.S. Geological Survey, 1980, p. 2-80), bore- hole-geophysical logs, and field and laboratory analyses of aquifer materials and water sam- ples, results of tests to determine construction integrity of the well, water-level measurements, and aquifer tests. Also in the well file are location map(s) and site sketches (see for example fig. 10). The location map(s) and site sketch need to be of sufficient detail and scale to enable field location of a well by field personnel unfamiliar with the site. Information on the location map(s) typ- ically includes roads, topography, water bodies, and cultural features. Compass directions or latitude/longitude and a horizontal scale need to be indicated on the location map(s). Distances from milepost markers or other permanent cultural features to the well site also are useful in- formation. The site sketch identifies the well location in relation to nearby features such as roads, railroad lines, fences, houses, barns, and out buildings. Compass directions need to be indicated on the sketch, and distances between features and the well typically are included on the sketch. A sketch of the well head identifies features of the well such as the height of the top of the casing in relation to land surface, the locations of measuring and sampling points, and general characteristics of the protective casing. Written descriptions of the site and well characteristics compliment the site and well-head sketches with other useful information, such as site access, whether or not the well is locked, whether or not owner notification is required prior to sampling, tools required, difficulties that might be encountered in locating the well, measuring the water level, or sampling the well, and the possible presence of animals. Well records must identify the location of the well and describe the point from which water level is measured (the "measuring point"). The locations and altitudes of wells sampled as part of Study-Unit Surveys and most Land-Use Studies will be determined from Geological Survey 7 1/2-minute quadrangle maps. For some Land-Use Studies and for Flowpath Studies, greater accuracy in locations and altitudes of wells will be required than can be determined 43