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TABLE 1 <br /> GROUNDWATER ELEVATION DATA AND SPO THICKNESS MEASUREMENTS <br /> US Can-Welty Road <br /> 35275 Welty Road <br /> Vernalis, California <br /> Abbreviations <br /> bgs=below ground surface <br /> DTW=Depth to Water <br /> ft=feet <br /> GWE=Groundwater Elevation <br /> amsl=above 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 NAND 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 /> Page 3 of 3 <br />