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LLNIKHL VIZ) lK1L ! <br /> 1L1,• GL( � fDVV 1'IhI LU 7V 1J1•+ IYu .v+� � ....-...».. <br /> California Department of Water Resources <br /> Division of Planning and Local Assistance <br /> Central District <br /> Key to Codes and Abbreviations <br /> This page explains the codes, abbreviations, and headings used in reports provided by the various pages <br /> from this web site. Not all reports show all the items listed here. <br /> State Well Number <br /> An identification number assigned to each monitoring site. The State Well Number is based on the <br /> public land grid, and includes the township, range, and section in which the well is located. <br /> Measurement Date <br /> The date on which the groundwater level reading was taken. <br /> Reference Point Elevation <br /> Listed on some reports as "RP. Elev.",is the elevation of the point from which the groundwater <br /> level reading was taken. The reference point for a well is selected for its permanence, such as the <br /> top of casing, or the edge of a concrete pad, Some reference points are below ground surface, for <br /> example, when the well is located in a cellar. 4ccassionally, due to activity at the site,the reference <br /> point needs to be changed to a more convenient location. <br /> Ground-Surface Elevation <br /> Listed on some reports as"G.S. Elev.", is the average elevation of the ground surface in the <br /> vicinity of the well. In a few cases, the ground surface elevation is determined by surveying <br /> methods. More often, the ground surface elevation is determined by interpolation from a USGS <br /> 7.5-minute topographic map. Thus, the accuracy of the reported ground surface elvation is a <br /> function of the contour interval of the topographic map. Most wells are located in areas where the <br /> contour interval of the topographic maps is 5 feet; however, some maps in the Central District are <br /> accurate to only 20 or 40 feet. <br /> Depth to Water <br /> Depth to water is listed in two columns of each report. The first, Below R.P., is the measured <br /> distance between the reference point and the water level in the well. The second, Below G.S. or <br /> Below L.S.D., is the measured distance from the ground surface to the water level in the well. <br /> Water gurface Elevation <br /> The Water Surface elevation reflects the elevation of the measured groundwater level in the well. <br /> It is calculated by subtracting the depth to water below R.P. measurement from the elevation of the <br /> R.P. <br /> 1 of 4 5/26/98 3:21 PM <br />