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TABLE 1 <br /> GROUNDWATER ELEVATION DATA AND SPO THICKNESS MEASUREMENTS <br /> US Can-Welty Road <br /> Vernalis,California <br /> Thickness of <br /> Well Date TOC Elevation DTW GWE SPO Estimated Volume of <br /> ID Measured Latitude Longitude (above MSL) (ft) (above MSL) (ft) SPO Removed(gallons) <br /> MW-2 07/28/98 37.6288012 -121.2861052 106.39' 32.58 73.81 ---- ---- <br /> 05/21/02 106.391 36.59 69.80 ---- ---- <br /> 07/18/05 108.503 37.45 71.05 ---- ---- <br /> 10/18/05 108.503 36.73 71.77 ---- ---- <br /> MW-3 07/28/98 37.62888390 -121.2865098 106.541 31.82 74.72 ---- ---- <br /> 05/21/02 106.541 36.23 74.72 ---- ---- <br /> 07/18/05 108.333 37.12 71.21 ---- ---- <br /> 10/18/05 108.333 36.42 71.91 ---- ---- <br /> MW-4 07/28/98 37.6285713 -121.2863260 107.331 32.74 74.59 ---- ---- <br /> 05/21/02 107.33' 37.20 70.13 ---- ---- <br /> 07/18/05 109.273 38.09 71.18 ---- ---- <br /> 10/18/05 109.273 37.37 71.90 ---- ---- <br /> MW-5 07/18/05 37.6273236 -121.2865307 109.313 38.09 71.22 ---- ---- <br /> 10/18/05 109.313 37.42 71.89 ---- ---- <br /> MW-6 07/18/05 37.6295514 -121.2854051 104.973 34.24 70.73 ---- ---- <br /> 10/18/05 104.973 33.71 71.26 ---- ---- <br /> MW-7 07/18/05 37.6288921 -121.2845469 106.003 35.51 70.49 ---- ---- <br /> 10/18/05 106.003 34.98 71.02 ---- ---- <br /> Abbreviations <br /> bgs=below ground surface <br /> DTW=Depth to water <br /> ft=feet <br /> GWE=Groundwater elevation <br /> MSL=mean sea level <br /> NM=Not measured/Observed <br /> SPO=Separate-phase oil <br /> TOC=Top of casing <br /> ----=Not Applicable <br /> Notes: <br /> 1. TOC elevations and groundwater elevations were based on the National Geodetic Vertical Datum of 1929(NGVD29). The horizontal datum is <br /> based on the North American Datum of 1983(NAD83). The benchmark used was United States Coast and Geodetic Survey brass disk with NGS <br /> designation"M-745'(PID Number MS0037);elevation of 104.18 feet(NGVD29). TOC elevations surveyed by RGA,July 1998. <br /> 2. Monitoring well TOC elevations re-surveyed on April 5,2005,by Morrow Surveying. Coordinates are California State Plane Zone 3 Coordinates <br /> from GPS Observations. Vertical Datum is NAVD 88 from GPS Observations. <br /> 3. Monitoring well TOC elevations surveyed on June 28,2005,by Morrow Surveying. Coordinates are California State Plane Zone 3 Coordinates. <br /> from GPS Observations. Vertical Datum is NAVD 88 from GPS Observations. <br /> 4. The potntiometric surface when SPD is present is estiamted using the following equation: Page 3 of 3 <br />