LIBRARY : CA LAYER NAME : RWQCBDIST COVERAGE NAME : RWQCBNDA COVERAGE DESCRIPTION: The 'RWQCBDIST' layer shows the boundaries of the Regional Water Quality Control Boards (9) in California. These district boundaries coincide with the boundaries of some of the hydrologic study areas delineated by the Department of Water Resources. See the 'GRDWATERBASIN' layer documentation for a fuller explanation of ground water basins and hydrologic study areas. VITAL STATISTICS: Datum: NAD27 Projection: Albers Units: Meters 1st Std. Parallel: 34 00 00 (34.0 degrees N) 2nd Std. Parallel: 40 30 00 (40.5 degrees N) Longitude of Origin: -120 00 00 (120.0 degrees W) Latitude of Origin: 00 00 00 (0.0 degrees) False Easting (X Shift): 0 False Northing (Y Shift): -4,000,000 Source: Department of Water Resources Division of Mines and Geology Source Media: Mylar Maps Source Projection: Lambert Source Units: Meters Source Scale: 1:250,000 Capture Method: Hand digitized Conversion Software: ARC/INFO Rev. 5.0.1 Data Structure: Vector ARC/INFO Coverage Type: Polygon ARC/INFO Precision: Double ARC/INFO Tolerances: 10 meters Number of Features: 9,224 Layer Size: 12.385 MB Last Updated: Summer 1994 DATA DICTIONARY: DATAFILE NAME: RWQCBNDA.PAT RECORD LENGTH: 56 Non-standard POLYGON attribute fields: COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ------------------------------------------------------------- 25 REGION 2 2 I - 27 NAME 30 30 C - NOTE: Items common to all POLYGON coverages: AREA, PERIMETER, RWQCBNDA# and RWQCBNDA-ID are not described here. REGION = region number NAME = region name DATA QUALITY ASSESSMENT: The following are subjective comments regarding this data. These district boundaries are formed from groundwater basin boundaries found in the 'GRDWATERBASIN' layer. The following comments come from the documentation for the 'GRDWATERBASIN' layer: "The State Water Resources Control Board traced selected formations from 250K USGS geologic maps onto mylar sheets. Because the USGS maps are regarded as high-quality maps and because of the integrity of mylar, it could be said that the resulting digitized coverage maintains good accuracy. Some of the tracings on the mylar, however, seemed a bit jagged and, in some cases, problems with horizontal rectification between USGS quads and the mylars were solved by repositioning tics. The coverage is, therefore, only of moderate quality." Coding of Board names and numbers is complete and accurate. DATA CONTACT: Contact Name: Chet Egbert or Steve Flatt Contact's Phone: 916-263-1649 / 916-263-1499