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Table A-1 Historical Groundwater Analytical Results San Joaquin County Human Services Agency Groundwater Analyte Concentration 1L Well No Sample Date Elevation feet Benzene Toluene Eth (benzene Xylene Total TPH- TPH-e Total Lead MW-1 12/3011988 NM ND 0 50 NO 0 50 NO 0 50 NO 0 50ND 200 ND 500 NO 512 00 MW-213 12/30/1988 NM 28,000 25,000 3,100 10,000 59,000 41,000 795 5/21/1997 NM 5,400 310 890 1,400 13,000 -- -- 12/16/1997 NM 1,500 17 1,100 1,000 9,100 -- -- 5/19/1999 NM 8,700 NO (0 50) 2,600 2,700 38,000 --11/16/1999 NM 13,000 190 3,000 3,800 45,000 -- -- 3/2/2000 NM 14,000 NO 2,500 550 20,000 -- -- 5/11/2000 NM 11,000 90 2,100 850 25,000 -- -- 8110/2000 NM 9,700 620 2,500 35,000 22,000 -- -- 11/2/2000 NM 18,500 286 3,070 5,950 57,300 -- -- 2/27/2001 NM 13,000 ND (100) 1,700 2,000 31,000 -- -- 5/17/2001 NM 15,000 61 1,800 2,000 27,000 -- 10/11/2001 NM 10,000 220 1,300 2,700 26,000 -- -- 2/5/2002 NM 12,000 NO (50) 770 940 28,000 -- -- 4/17/2002 NM 10,000 NO (100) 810 1,000 25,000 -- -- 6/25/2002 NM 10,000 18 740 1,100 10,000 -- -- 6/25/2002(dup) NM 9,900 24 940 1,300 12,000 -- -- 9/19/2002 NM 13,000 34 140 300 14,000 -- -- 12/11/2002 NM 11,000 ND (100) 550 NO (100) 25,000 -- -- 12/11/2002 (dup) NM 11,000 NO (100) 760 NO (100) 28,000 -- -- 6/11/2003 NM 11,000 ND (100) 680 860 25,000 -- 6/11/2003(dup) NM 11,000 ND (100) 600 740 24,000 -- -- 10/6/2003 NM 9,400 NO (50) 360 270 24,000 -- -- 1/13/2004 NM 15,000 ND (50) NO (50) 270 27,000 -- -- 3/31/2004 NM 12,000 NO (50) 160 NO (50) 25,000 -- -- 6125/2004 NM 11,000 NO 360 540 16,000 -- -- 6/25/2004 (dup) NM 11,000 120 370 530 17,000 -- -- 9/15/2004 NM 11,000 NO (50) 440 470 22,000 -- -- 12/17/2004 NM 8,900 ND (50) 100 NO (0 50) 15,000 -- -- 12/17/2004(dup) NM 8,700 NO(50) 110 NO(0 50) 14,000 - -- 3/22/2005 NM 14,000 NO(50) 120 140 21,000 -- -- 6/30/2005 NM 6,900 23 350 120 12,000 -- -- 6/30/2005 (dup) NM 5,800 22 310 110 11,000 -- -- 9/29/2005 NM 7,800 27 250 220 16,000 -- -- 1 of 8