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TABLE 1 <br /> GROUNDWATER ELEVATION DATA AND SPO THICKNESS MEASUREMENTS <br /> Vernalis Pump Station <br /> 35500 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-5 07/18/05 37.6273236 -121.2865307 109.313 38.09 71.22 ---- ---- <br /> 10/18/05 109.31 37.42 71.89 ---- ---- <br /> 01/20/06 109.31 38.12 71.19 ---- ---- <br /> 05/04/06 109.31 38.78 70.53 ---- ---- <br /> MW-6 07/18/05 37.6295514 -121.2854051 104.973 34.24 70.73 ---- ---- <br /> 10/18/05 104.97 33.71 71.26 ---- ---- <br /> 01/20/06 104.97 34.49 70.48 ---- ---- <br /> 05/04/06 104.97 35.17 69.80 ---- ---- <br /> MW-7 07/18/05 37.6288921 -121.2845469 106.003 35.51 70.49 ---- ---- <br /> 10/18/05 106.00 34.98 71.02 ---- ---- <br /> 01/20/06 106.00 34.30 71.70 ---- ---- <br /> 05/04/06 106.00 36.21 69.79 ---- ---- <br /> Abbreviations <br /> ----=Not Applicable <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. 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 Coordinate <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 potentiometric surface when SPO is present is estimated using the following equation: <br /> PSw=Ew+(SGp x Tp) <br /> Where: PSw =Potentiometric surface of <br /> Ew =Elevation of groundwater(measured) <br /> SGp=Specific gravity of product(0.9367) <br /> Tp=Measured product <br /> Page 3 of 3 <br />