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GEOMATRIX <br /> TABLE 1 <br /> WELL SURVEYING AND GROUNDWATER ELEVATION DATA <br /> Roberts Property <br /> Vernalis, California <br /> 2 Depth to Thickness of <br /> SurveyCoordinates Top-of-Casing Screen Boring Water Below Water Level Separate Phase <br /> Elevation' Intervals Well Depth Depth Date Top-of-Casing Elevation Petroleum <br /> Well Northing Easting feet MSL feet bs feet bs feet bsGaued feet (feet,MSL) <br /> feet <br /> MW-1 2052339.9 6333953.4 107.40 28-38 38 52 7/28/98 NA NA 0.5 <br /> 5/21/02 NA NA 0.25 <br /> MW-2 2052379.6 6334020.8 106.39 28-38 38 47 7/28/98 32.58 73.81 NA <br /> 5/21/02 36.59 69.80 NA <br /> MW-3 2052410.8 6333904.3 106.54 28 -38 39 42.5 7/28/98 31.82 74.72 NA <br /> 5/21/02 36.23 70.31 NA <br /> MW-4 12052296.61 6333956.5 107.33 28-38 39 45.5 7/28/98 32.74 74.59 NA <br /> 5/21/02 37.2 70.13 NA <br /> Notes: <br /> ' Wells Installed July 1998 by Radian International LLC. <br /> 2 Wellhead elevations and groundwater elevations were based on the National Geodetic Vertical Datum of 1929(NGVD29). The horizontal datum is based <br /> on the North American Datum of 1983 (NAD83). The benchmark used was United States Coast and Geodetic Survey brass disk with NGS designation <br /> "M-745"(PID Number MS0037); elevation of 104.18 feet(NGVD29). <br /> 3 Monitoring well elevation in feet above mean sea level(MSL)based on benchmark elevation surveyed by RGA,July 1998. <br /> 4 NA=Not available or not applicable. <br /> feet bgs= feet below ground surface. <br /> [:\Doc_Safe\5000s\5011.001\Roberts WP 2003.xis <br />