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Table 3 Groundwater Gradient ARCO Station#548 1612 West Hammer Lane Stockton,California Approximate Flow Approximate Hydraulic Approximate Flow Approximate Hydraulic Date Sampled Direction Gradient(ft/ft) Direction Gradient(ft/ft) Shallow Zone Shallow Zone Deep Zone Deep Zone 2/1511995 No Data No Data No Data No Data 5/12/1995 - -- - - 8/29/1995 - -- -- -- 12/4/1995 - -- — - 2/2/1996 - -- - 5/10/1996 - -- — — 8/29/1996 — -- — — 11/20/1996 -- -- - - 3/19/1997 — - -- 5/27/1997 -- -- - - 8/12/1997 — -- -11/18/1997 - -- - - 2/16/1998 - -- - - 6/23/1998 - - -- 9/29/1998 -- - — 12/30/1998 - - — -- 3/31/1999 -- - — 0.002 6/28/1999 -- — 0.002 9/10/1999 -- -- _ 0.004 12/13/1999 - -- - 0.004 3/28/2000 -- -- -- 0.003 6/26/2000 - -- - 0.002 9/28/2000 - -- -- 0.0038 12/18/2000 - -- - 0.0028 3/14120010.0021 M _ N 6/19t2001 0.002 9/11!2001 - — 0.0037 12/13/2001 - - 0.0037 3/12/2002 — -- — 0.0026 6/17/2002 - -- East-Northeast 0.003 9/9/2002 -- -- Northeast 0.005 12/4/2002 - -- Northeast 0.002 3/3/2003 - -- Southeast 0.03 _ 6/3/2003 Southeast 0.02 9/18/2003 - -- Southeast 0.03 12/8/2003 -- -- Northeast-Southwest 0.004-0.033 3/11/2004* North and South 0.03 and 0.05 East-Southeast 0.008 6/1112004* Northeast 0.05 East 0.005 8/312004* None None Northeast 0.004 12/22/2004* Northeast 0.004 Northeast 0.004 3/29/2005* Northeast 0.004 East-Southeast 0.004 6116/2005* East 0.003 East 0.004 919/2005" Northeast 0.006 East 0.008 1217/2005* East 0.004 East _ 0.004 3/22/2006* East 0.003 East 0.003 *-Gradient recalculated based on a new survey conducted by Morrow Surveying on May 5,2006(5-4-06). I:IBP-ARM04 BP Valley P0rtf0Ii015481Tables106-Q11548 Table 1-2-3-4 5/31/2006