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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` 3258 73.81 --05121/02 106 39' 3659 69.80 -- -- <br /> 07/18/05 108 50 37.45 7105 -- -- <br /> 10/18/05 10850 3 3673 71 77 <br /> MW-3 07/28/98 37 62888390 -121 2865098 106 54' 31 82 7472 <br /> 05/21/02 106 54' 36.23 7472 -- _- <br /> 07/18/05 108 33' 37.12 7121 -- -- <br /> 10/18/05 108 33' 36.42 7191 -- -- <br /> MW4 07/28/98 37 6285713 -1212863260 107 33 1 32.74 7459 <br /> 05/21/02 107 33' 3720 70 13 <br /> 07/18/05 109 27' 3809 71 18 -- -- <br /> 10/18/05 109 27' 37,37 71 90 -- -- <br /> MW-5 07/18/05 376273236 -1212865307 109.31' 3809 7122 -- _- <br /> 10/18/05 109 313 3742 71 89 -- -- <br /> MW-6 07/18/05 37 6295514 -1212854051 104 97' 3424 7073 -- -- <br /> 10/18/05 104 97' 33 71 71.26 <br /> MW-7 07!18105 37 6288921 -121 2845469 106 00' 35 51 7049 -- -_ <br /> 10/18/05 106 00' 3498 7102 -- -- <br /> Abbreviations <br /> bgs-below ground surface <br /> DTW-Depth to water <br /> R-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 sune}ed 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 as NAVD 88 from GPS Observations <br /> 4 The potnttiometric surface when SPD is present is estiamted using the following equation Page 3 of 3 <br />