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TABLE 6 <br /> Monitoring Well Survey and Groundwater Elevation Data <br /> U.S. Can/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 /> MSL=mean sea level <br /> NM=Not measured/Observed <br /> SPO=Separate Phase Oil <br /> TOC=Top of Casing <br /> Notes: <br /> 1. Top of Casing 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 re-surveyed on April 5,2005,by Morrow Surveying. Coordinates are California State Plane Zone 3 Coordinates from GPS Observations. <br /> Vertical Datum is NAVD 88 from GPS Observations. <br /> Page 2 of 2 <br />