SITE INFORMATION AND CORRESPONDENCE_1992

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GROUNDWATER CONTOUR MAP INFORMATION 1 . Quarterly water elevations are entered into a Symphony spreadsheet form. The spreadsheet calculates a single sea level water elevation for each monitoring well . A file is created from this spreadsheet containing water elevation , an east-west coordinate and a north-south coordinate . This file is imported into Surfer (the groundwater contouring program) . 2 . We use Surfer (Golden Software , Inc . , Golden , Colorado) version 4 . 15 with the following parameters : A. During the Gridding Process : 1 . Grid lines in the X&Y dimensions= 35 . 0 . 2 . Gridding method= Kriging . ( Instead of InvDist or MinCurv) . 3 . Search method= All . (Rather than Normal , Quadrant or Octant) . 4 . All minimum and maximum X and Y grid values are set to automatic . A set value is not entered . The program now creates a regularly spaced grid for irregularly spaced data for the base . B . The Topo process plots the base water elevation contour map with the following parameters : 1 . The minimum and maximum contours levels are determined by the program_ 2 . The contour interval= 0 . 5 feet . 3 . Every contour line is labeled. 4 . Hachure length= 0 . 3 . 5 . The contour lines are smoothed , with tension= 2 . 6 . The Post Block function is used to identify four corners of the contour map to overlay onto the base map . 7 . The plot file is sent to an output . DXF file for conversion and importing to the Generic Cadd (version 6 . 0) program. The two dimensional groundwater contour map can be displayed at this time on the CRT . Note : By varying the contour interval (item 2 . B . 2) from 0 . 5 to 0 . 1 feet , we can verify a suspected capture zone . While this does give an indication of a capture zone , we plot the contour maps at 0 . 5 feet intervals for both clarity and coinsistancy . 3 . Generic Cadd 6 . 0 (Autodesk , Bothell , WA) combines the base map and the groundwater contour map into one ' D' size drawing .