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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 /> 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 /> MW-6 01/24/07 104.97 34.19 70.78 ---- ---- <br /> 05/01/07 104.97 33.99 70.98 ---- ---- <br /> 08/06/07 104.97 33.23 71.74 ---- ---- <br /> 10/29/07 104.97 33.41 71.56 ---- ---- <br /> 01/29/08 104.97 34.43 70.54 ---- ---- <br /> 04/09/08 104.97 34.69 70.28 <br /> 07/17/08 104.97 34.66 70.31 ---- ---- <br /> 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 /> MW-7 01/24/07 106.00 35.49 70.51 ---- ---- <br /> 05/01/07 106.00 35.24 70.76 ---- ---- <br /> 08/06/07 106.00 35.54 70.46 ---- ---- <br /> 10/29/07 106.00 34.65 71.35 ---- ---- <br /> 01/30/08 106.00 35.76 1 70.24 ---- <br /> 04/09/08 106.00 35.91 70.09 <br /> 07/17/08 106.00 35.90 70.10 ---- <br /> Abbreviations Notes: <br /> ----=Not applicable 1. TOC elevations and groundwater elevations based on NGVD of 1929(NGVD29). Horizontal datum based on NAD of 198: <br /> bgs=Below ground surface (NAD83). Benchmark used was United States Coast and Geodetic Survey brass disk with NGS designation°M-745' <br /> ft=Feet (PID Number MS0037);elevation of 104.18 feet(NGVD29). TOC elevations surveyed by RGA,July 1998 <br /> GPS=Global Positioning System 2. Monitorin¢well TOC elevations re-surveved on April 5,2005,by Morrow Survevine. Coordinates are California State Plane Zone <br /> GWE=Groundwater elevatior Coordinates from GPS Observations. Vertical Datum is NAVD 88 from GPS Observations <br /> ID=Identifrcation 3. Monitorin¢well TOC elevations surveyed on June 28,2005,by Morrow Survevine. Coordinates are California State Plane Zone <br /> MSL= Mean sea level Coordinates from GPS Observations. Vertical Datum is NAVD 88 from GPS Observations <br /> MW=Monitoring well 4.The potentiometric surface when SPO is present is estimated using the following equation: <br /> NAD=North American Datum PSw=Ew+(SGp x Tp) <br /> NAVD=North American Vertical Datum Where: PSw =Potentiometric surface of groundwater <br /> NGS=National Geodetic Survey Ew =Elevation of groundwater(measured) <br /> NGVD=National Geodetic Vertical Datum SGp=Specific gravity of product(0.9367) <br /> NM=Not measured/observed Tp=Measured product thickness <br /> RWQCB=Regional Water Quality Control Boarc 5.Well was not accessible, <br /> SPO=Separate-phase oil 6. Not monitored on a quarterly basis per RWQCB. <br /> TOC=Top of casing <br /> NEW <br /> Page 5 of 5 From Science to sofutrons <br />