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TABLE 1 GROUNDWATER ELEVATION DATA AND SPO THICKNESS MEASUREMENTS Vernalis Pump Station 35500 Welty Road Vernalis,California Thickness of Well Date TOC Elevation DTW GWE SPO Estimated Volume of ID Measured Latitude Longitude (above MSL) (ft) (above MSL) (ft) SPO Removed(gallons) US Can-Welty Road MW-1 06/01/99 37.6307615 -121.2880508 104.42' 31.62 72.78 0.02 ---- 05/21/02 104.421 NM ---- 0.01 ---- 04/21/05 106.382 36.11 70.27 sheen ---- 07/18/05 106.382 NM ---- sheen ---- 10/18/05 106.382 34.59 71.79 sheen MW-2 06/01/99 37.6316912 -121.2890500 103.11 30.12 72.97 0.02 ---- 05/21/02 103.11 32.44 70.67 sheen ---- 08/07/03 103.11 31.78 71.33 sheen ---- 04/21/05 105.012 34.31 70.70 sheen ---- 07/18/05 105.012 33.23 71.78 odor ---- 10/18/05 105.012 32.62 72.39 odor ---- MW-3 06/01/99 37.6305748 -121.2878426 104.21' 31.30 72.91 ---- ---- 05/21/02 104.21' 33.74 70.47 ---- ---- 08/07/03 104.21' 33.37 70.84 ---- ---- 04/21/05 106.132 35.61 70.52 ---- ---- 07/18/05 106.132 34.22 71.91 ---- ---- 10/18/05 106.132 34.03 72.10 ---- ---- MW-4 06/01/99 37.6297969 -121.2877653 105.32' 32.23 73.09 ---- ---- 05/21/02 105.32[ 34.81 70.51 ---- ---- 04/21/05 107.182 36.60 70.58 ---- ---- 07/18/05 107.182 35.65 71.53 ---- ---- 10/18/05 107.182 35.02 72.16 ---- ---- MW-5 04/05/05 37.6314345 -121.2877179 103.342 33.15 70.19 ---- ---- 04/21/05 103.342 32.94 70.40 ---- ---- 07/18/05 103.342 31.98 71.36 ---- ---- 10/18/05 103.342 31.50 71.84 ---- ---- WFSMW-1 06/01/99 37.6322461 -121.2887699 105.31 NM ---- ---- ---- 05/21/02 105.31' 34.56 70.75 ---- ---- 04/21/05 107.142 36.58 70.56 ---- ---- 07/27/05 107.142 35.03 72.11 ---- ---- 10/18/05 107.142 34.98 72.16 ---- ---- Vernalis Pump Station MW-1 07/28/98 37.6286900 -121.2863371 107.40' NM ---- 0.50 ---- 05/21/02 107.40' NM ---- 0.25 ---- 07/18/05 109.27' NM ---- sheen ---- 10/18/05 109.273 36.25 73.02 sheen ---- MW-2 07/28/98 37.6288012 -121.2861052 106.39[ 32.58 73.81 ---- ---- 05/21/02 106.391 36.59 69.80 ---- ---- 07/18/05 108.503 37.45 71.05 ---- ---- 10/18/05 108.50' 36.73 71.77 ---- ---- MW-3 07/28/98 37.62888390 -121.2865098 106.541 31.82 74.72 ---- ---- 05/21/02 106.54[ 36.23 74.72 ---- ---- 07/18/05 108.333 37.12 71.21 ---- ---- 10/18/05 108.333 36.42 71.91 ---- ---- MW4 07/28/98 37.6285713 -121.2863260 107.33[ 32.74 74.59 ---- ---- 05/21/02 107.331 37.20 70.13 ---- ---- 07/18/05 109.273 38.09 71.18 ---- ---- 10/18/05 109.27' 37.37 71.90 ---- ---- MW-5 07/18/05 37.6273236 -121.2865307 109.31' 38.09 71.22 ---- ---- 10/18/05 109.313 37.42 71.89 ---- ---- MW-6 07/18/05 37.6295514 -121.2854051 104.973 34.24 70.73 ---- ---- 10/18/05 104.973 33.71 71.26 ---- ---- MW-7 07/18/05 37.6288921 -121.2845469 106.00' 35.51 70.49 ---- ---- 10/18/05 106.003 34.98 71.02 ---- ---- Abbreviations bgs=below ground surface DTW=Depth to water It=feet GWE=Groundwater elevation MSL=Mean sea level NM=Not measured/observed SPO=Separate-phase oil TOC=Top of casing ----=Not Applicable Notes: 1.TOC elevations and groundwater elevations were based on the National Geodetic Vertical Datum of 1929(NGVD29).The horizontal datum is based on the North American Datum of 1983(NAD83).The benchmark used was United States Coast and Geodetic Survey brass disk with NGS designation"M-745'(PID Number MS0037);elevation of 104.18 feet(NGVD29).TOC elevations surveyed by RGA,July 1998. 2.Monitoring well TOC elevations re-surveyed on April 5,2005,by Morrow Surveying.Coordinates are California State Plane Zone 3 Coordinate; from GPS Observations.Vertical Datum is NAVD 88 from GPS Observations. 3.Monitoring well TOC elevations surveyed on June 28,2005,by Morrow Surveying.Coordinates are California State Plane Zone 3 Coordinates. from GPS Observations.Vertical Datum is NAVD 88 from GPS Observations. 4.The potntiometric surface when SPD is present is estimated using the following equation: PSw=Ew+(SGp x Tp) Where:PSw=Potentiometric surface of groundwater Ew=Elevation of groundwater(measured) SGp=Specific gravity of product(0.9367) Tp=Measured product thickness Page 1 of 1