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from 7 1/2-minute quadrangle maps. In these cases, standard second-order ground-surveying <br />techniques (Davis and others, 1966) generally are to be used. An alternative to ground surveying <br />is to use a global-positioning system. In addition, the records should show if a vertical reference <br />point has been established near the well that can be used to check the measuring point and to re- <br />establish a measuring point that has been changed or destroyed. <br />Table 11. Information required for creation of files and storage of water-quality-related data in <br />U.S. Geological Survey data bases within the National Water Information System-I <br />Data required for creation of a site file in the Ground-Water Site Inventory data base' (GWSI) <br />Component number for Example code <br />Data description data entry into GWSI (Description of code) <br />Agency Code C4 USGS <br />Site (Station) Identification C1 394224075340501 <br />(Latitude/longitude/sequence no.) <br />Station Name C12 Alpha <br />Latitude C9 394224 <br />Longitude CIO 753405 <br />Station locator sequence <br />number C815 01 <br />District/User C6 24 (Maryland) <br />State C7 10 (Delaware) <br />County Code C8 003 (Sussex) <br />Agency Use C803 A (Active) <br />Station Type C802 Y (Well) <br />Data Reliability C3 C (Field Checked) <br />Site Type C2 W (Well) <br />Use of site C23 O (Observation) <br />Data required for storage of sample analyses in the Water-Quality data base (QWDATA) <br />Example code <br />Data description (Description of code) <br />Agency Code USGS <br />Station Identification 394224075340501 <br />Sample Medium 6 (ground water) <br />Sample Type 2 (blank sample) <br />Hydrologic ("Hydro') Event 9 (routine sample) <br />Hydrologic ("Hydro') Condition 9 (stable, normal stage) <br />Begin Date and Time (month/day/year, 090988, 1530 hrs <br />standard military time) <br />Analysis Status H (initial entry) <br />Analysis Source 9 (USGS laboratory and field) <br />'From Ground-Water Site Schedule Form No. 9-1904-A, February, 1987. <br />44