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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 (ft above MSL) (ft) (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 /> 08/10/065 109.31 NM ---- ---- ---- <br /> 11/07/065 109.31 NM ---- ---- ---- <br /> 01/24/07 109.31 38.15 71.16 ---- ---- <br /> 05/08/07 109.31 38.02 71.29 ---- ---- <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 /> 08/10/06 104.97 33.87 71.10 ---- ---- <br /> 11/07/06 104.97 33.46 71.51 ---- ---- <br /> 01/24/07 104.97 34.19 70.78 ---- ---- <br /> 05/01/07 107.97 33.99 70.98 ---- ---- <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 /> 08/10/06 106.00 35.15 70.85 ---- ---- <br /> 11/07/06 106.00 34.77 71.23 ---- ---- <br /> 01/24/07 106.00 35.49 70.51 ---- ---- <br /> 05/01/07 106.00 35.24 70.76 ---- ---- <br /> Abbreviations: Notes: <br /> ----=Not applicable 1. TOC elevations and groundwater elevations were based on the NGVD29. The horizontal datum is <br /> bgs=Below ground surface based on the NAD83. The benchmark used was United States Coast and Geodetic Survey brass disk with NGS <br /> DTW=Depth to water designation"M-745'(PID Number MS0037);elevation of 104.18 feet(NGVD29). TOC elevations surveyed by RGA,July 1998. <br /> ft=Feet 2. Monitoring well TOC elevations re-surveyed on April 5,2005,by Morrow Surveying. Coordinates are California State Plane Zone <br /> GPS=Global Positioning System Coordinates from GPS Observations. Vertical Datum is NAVD 88 from GPS Observations. <br /> GWE=Groundwater elevation 3. Monitoring well TOC elevations surveyed on June 28,2005,by Morrow Surveying. Coordinates are California State Plane Zone <br /> ID=Identification Coordinates from GPS Observations. Vertical Datum is NAVD 88 from GPS Observations. <br /> MSL= Mean sea level 4.The potentiometric surface when SPO is present is estimated using the following equation: <br /> MW=Monitoring well PSw=Ew+(SGp x Tp) <br /> NAD83=North American Datum of 1983 Where: PSw =Potentiometric surface of groundwater <br /> NGS=National Geodetic Survey Ew =Elevation of groundwater(measured) <br /> NGVD29=National Geodetic Vertical Datum of 1929 SGp=Specific gravity of product(0.9367) <br /> NM=Not measured/observed Tp=Measured product thickness <br /> SPO=Separate-phase oil 5.Well was not accessible. <br /> TOC=Top of casing <br /> s= <br /> WFSMW=Western Farm Service monitoring well �f <br /> Page 4 of 4 From Science to sofutrons <br />