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Table 3 <br /> Historical Groundwater Elevation Data <br /> Time Oil Company-Property 04-049 <br /> 14000 East Highway 88 <br /> Lockeford California <br /> WELL DATE TOP OF CASING PRODUCT DEPTH TO GROUNDWATER ELEVATION <br /> ID SAMPLED ELEVATION ' THICKNESS WATER ELEVATION CHANGE CGWE" <br /> (FEET) (FEET) (FEET) (FEET) (FEET) (FEET) <br /> MW-4 01/19/95 9889 NP 7980 1909 <br /> 05/24/95 NP 8662 1227 -682 <br /> 10/04/95 NP 7721 2168 941 <br /> 12/19/95 NP 7681 2208 040 <br /> 02/28/96 NP 7653 2236 028 <br /> 05/23/96 NP 7607 2282 046 <br /> 07/19/96 NP 7592 2297 015 <br /> 12/19/96 NP 7645 2244 -053 <br /> 02/26/97 NP 7493 2396 1 52 <br /> 04/16/97 NP 7434 2455 059 <br /> 07/14/97 NP 7364 2525 070 <br /> 10/13/97 NP 7398 2491 -034 <br /> 01/27/98 NP 7425 2464 -027 <br /> 04/27/98 NP 7360 2529 065 <br /> 08/13/98 NP 7279 2610 081 <br /> 10/26/98 NP 7226 2663 053 <br /> 01/27/99 NP 7275 2614 -049 <br /> 04/26/99 NP 7276 2613 -001 <br /> 07/14/99 NP 7291 2598 -015 <br /> 11/24/99 NP 7376 2513 -085 <br /> 02/17/00 NP 7386 2503 -010 <br /> • 06/01/00 NP 7340 2549 046 <br /> 08/18/00 NP 7381 2508 -041 <br /> 11/03/00 NP 7425 2464 -044 <br /> 01/11/01 NP 7440 2449 -015 <br /> 04/27/01 NP 7374 2515 066 <br /> 08/20/01 NP 7478 2411 -1 04 <br /> 11/28/01 NP 7574 2315 -096 <br /> 03/04/02 NP 7582 2307 -008 <br /> 05/16/02 101 15.1 NP 7586 2529 222 <br /> 07/25/02 NP 7613 2502 -027 <br /> 11/12/02 NP 7645 -7645 -10147 <br /> 01/16/03 NP 7618 -7618 027 <br /> 05/15/03 NP 7630 -7630 -012 <br /> 07/24/03 NP 7649 -7649 -019 <br /> 10/20/03 NP 7665 -7665 -016 <br /> 01/05/04 NP 7667 -7667 -002 <br /> 04/01/04 NP 7625 -7625 042 <br /> 07/23/04 NP 7658 -7658 -033 <br /> 10/04/04 NP 1 7672 1 -7672 1 -014 <br /> Notes <br /> NP = Not Present <br /> CGWE = Corrected Ground Water Elevation <br /> PT = Product Thickness <br /> Initial survey conducted on 1/19195 for monitor wells MW-1 through MW-4 with an arbitrary datum of 100 feet <br /> assumed at the southeast corner of the underground storage tank concrete pad Monitor wells MW-5 through <br /> MW-10 were surveyed on 07/19/96 using the same arbitrary datum <br /> ` Groundwater elevations corrected where PT was observed, using the equation Oge+ (PT x SgP) <br /> Cge =Oge+(PT x SgP)where <br /> • Cge =Corrected groundwater elevation <br /> Oge =Observed groundwater elevation <br /> SgP = Estimated specific gravity of free phase gasoline=assumed specific gravity <br /> Monitor wells were resurveyed by Morrow Surveying on May 14, 2002 <br /> 4 Well considered dry <br /> \Time Otl\Lockeford\TableslSCM&Asmt This As Page 4 of 10 <br />