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TABLE 1 <br /> GROUNDWATER ELEVATION DATA AND SPO THICKNESS MEASUREMENTS <br /> VERNALIS PUMP STATION <br /> Vernalis,California <br /> Thickness of <br /> Well Date TOC Elevation DTW GWE SPO Estimated Volume of <br /> ID Measured Latitude Longitude (ft above MSL) (ft) (ft above (ft) SPO Removed(gallons) <br /> MW-7 07/18/05 37.6288921 -121.2845469 106.00; 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 /> 08/10/06 106.00 35.15 70.85 - -- <br /> 11/07/06 106.00 34.77 71.23 ---- ---- <br /> 01/24/07 107.00 35.49 70.51 --- --- <br /> Abbreviations <br /> --=Not applicable <br /> bgs=Below ground surface <br /> ft=Feet <br /> GPS=Global positioning system <br /> GWE=Groundwater elevation <br /> ID=Identification <br /> MSL= Mean sea level <br /> MW=Monitoring well <br /> NAD=North American Datum <br /> NAVD=North American Vertical Datum <br /> NGS=National Geodetic Survey <br /> NGVD=National Geodetic Vertical Datum <br /> NM=Not measured/observed <br /> SPO=Separate-phase oil <br /> TOC=Top of casing <br /> Notes: <br /> I. TOC elevations and groundwater elevations were based on the NGVD of 1929(NGVD29). The horizontal datum is <br /> based on the NAD 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 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 /> 5.Well was not accessible. <br /> �i i ii <br /> From Science to Solutions <br /> Page 4 of 4 <br />