ARCHIVED REPORTS_FIRST QUARTER 2007 GROUNDWATER MONITORING AND SAMPLING REPORT

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TABLE I GROUNDWATER ELEVATION DATA AND SPO THICKNESS MEASUREMENTS VERNALIS PUMP STATION Vernalis,California Thickness of Well Date TOC Elevation DTW GWE SPO Estimated Volume of ID Measured Latitude Longitude (ft above MSL) (ft) (ft above (ft) SPO Removed(gallons) US Can-Welty Road MW-1 06/01/99 37.6307615 -121.2880508 104.421 31.62 72.78 0.02 ---- 05/21/02 104.42 NM ---- 0.01 ---- 04/21/05 106.382 36.11 70.27 sheen ---- 07/18/05 106.38 NM ---- sheen ---- 10/18/05 106.38 34.59 71.79 sheen 0.08 02/14/06 106.38 NM ---- sheen ---- 05/03/06 106.38 NM ---- sheen ---- 08/16/06 106.38 34.73 71.65 sheen 0.13 11/08/06 106.38 34.14 72.24 sheen ---- 01/23/07 106.38 35.09 71.29 sheen 0.03 MW-2 06/01/99 37.6316912 -121.2890500 103.111 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 ---- 07/18/05 105.01 33.23 71.78 odor ---- 10/18/05 105.01 32.62 72.39 odor ---- 02/14/06 105.01 NM ---- odor ---- 05/03/06 105.01 NM ---- sheen 0.10 08/16/06 105.01 33.31 71.70 sheen ---- 11/08/06 105.01 32.29 72.72 ____ ---- 01/23/07 105.01 33.41 71.60 sheen ---- Total SPO 0.34 MW-3 06/01/99 37.6305748 -121.2878426 104.211 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 ---- ---- 07/18/05 106.13 34.22 71.91 ---- ---- 10/18/05 106.13 34.03 72.10 ---- 02/14/06 106.13 35.04 71.09 ---- ---- 05/03/06 106.13 36.50 69.63 ---- ---- 08/16/06 106.13 34.29 71.84 ---- ---- 11/08/06 106.13 33.70 72.43 ---- ---- 01/23/07 5 106.13 NM ---- ____ ---- MW-4 06/01/99 37.6297969 -121.2877653 105.321 32.23 73.09 --- 05/21/02 105.32 34.81 70.51 ---- ---- 04/21/05 107.182 36.60 70.58 ---- ---- 07/18/05 107.18 35.65 71.53 ---- ____ 4A A m.-/rII i.x Page I of 4 From SGence to solutions