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TABLE 1 <br /> SUMMARY OF 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 (ft) SPO Removed(gallons) <br /> 06/01/99 37.6322461 -121.2887699 105.312 NM ---- ---- <br /> 05/21/02 105.31 34.56 70.75 ---- <br /> 04/21/05 107.143 36.58 70.56 ---- <br /> 07/27/05 107.14 35.03 72.11 ---- <br /> 10/18/05 107.14 34.98 72.16 ---- <br /> 02/14/06 107.14 36.20 70.94 ---- ---- <br /> WFSMW-1 05/03/06 107.14 36.76 70.38 ---- ---- <br /> 08/16/06 107.14 35.18 71.96 ---- <br /> 11/08/06 107.14 34.48 72.66 ---- <br /> 01/23/07 107.14 35.67 71.47 ---- ---- <br /> 04/30/07 107.14 35.20 71.94 ---- ---- <br /> 08/07/0 1 1 107.14 NM ---- ---- ---- <br /> Monitoring discontinued on 08/21/07 per RWQCB. <br /> Abbreviations: Notes: <br /> bgs=Below ground surface 1.The potentiometric surface when SPO is present is estimated using the following equation: <br /> DTW=Depth to water PSw=Ew+(SGp x Tp) <br /> ft=Feet Where: PSw =Potentiometric surface of groundwater <br /> GPS=Global Positioning System Ew =Elevation of groundwater(measured) <br /> GWE=Groundwater elevation SGp=Specific gravity of product(0.9367) <br /> ID=Identification Tp=Measured product thickness <br /> MSL= Mean sea level 2. TOC elevations and groundwater elevations were based on the NGVD29. The horizontal datum is <br /> MW=Monitoring well based on the NAD83. The benchmark used was United States Coast and Geodetic Survey brass disk with NGS <br /> NAD83=North American Datum of 1983 designation"M-745'(PID Number MS0037);elevation of 104.18 feet(NGVD29). TOC elevations surveyed by RGA,July 1998. <br /> NAVD88=North American Vertical Datum of 1988 3. Monitoring well TOC elevations re-surveyed on April 5,2005,by Morrow Surveying. Coordinates are California State Plane Zone <br /> NGS=National Geodetic Survey Coordinates from GPS observations. Vertical Datum is NAVD88 from GPS observations. <br /> NGVD29=National Geodetic Vertical Datum of 1929 4. Monitoring well TOC elevations surveyed on June 28,2005,by Morrow Surveying. Coordinates are California State Plane Zone <br /> NM=Not measured/observed Coordinates from GPS observations. Vertical Datum is NAVD88 from GPS observations. <br /> PID=Permanent Identifier 5. Not monitored on a quarterly basis per RWQCB. <br /> RWQCB=Regional Water Quality Control Board 6.Groundwater elevation not used in contouring due to presence of SPO. <br /> SPO=Separate-phase oil 7.Well was not accessible. <br /> TOC=Top of casing <br /> WFSMW=Western Farm Service monitoring well <br /> =Not applicable <br /> Page 3 of 3 from scwwd to sofufws <br />