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Table 4 <br /> Historical Quarterly Groundwater Sample Analytical Results <br /> The Earth Grains Company <br /> Stockton, California <br /> Concentration {ugh) <br />' Well Date TPH-G Benzene Toluene Ethylbenzene Total Xylenes <br /> MW-4 2/5/88 1,200 75 85 ND(<0 3) 130 <br />' 4/26188 NS 19 21 ND(<0 3) 31 <br /> 3/19/90 ND(<50) ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 5) <br /> 3/23/94 14,000 230 1,300 110 2,400 <br />' 617/94 7,900 210 1,100 97 2,100 <br /> 9/7/94 6,600 180 710 77 1,500 <br /> 2/12/96 3,700 75 450 29 1,100 <br />' 5113/96 3,800 66 220 61 380 <br /> 9/17/96 ND(<50) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) <br /> 12/16/96 6,500 54 330 87 1,400 <br />' 7/15/97 ND(<50) ND(<0 5) ND(<0 5) ND(<0 5) 0 7 <br /> MW-5 2/5/88 ND(<50) ND(<0 3) 0 6 ND(<0 3) ND(<0 5) <br />' 4/26/88 NS ND(<0 3) 0 7 ND(<0 3) ND(<0 5) <br /> 3119/90 ND(<50) ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 5) <br /> 9/17/96 ND(<50) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) <br /> 12/16/96 ND(<50) ND(<0 5) 0 64 ND(<0 5) ND(<0 5) <br /> 7/15/97 ND(<50) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) <br /> MW-6 3/19190 ND(<50) ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 5) <br />' 12/20/90 ND(<50) ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 5) <br /> 4/9/92 ND(<50) ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 5) <br /> 4/7193 ND(<50) ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 5) <br />' 7/30/93 ND(<50) ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 5) <br /> 10/21/93 ND(<50) ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 5) <br /> 12/29/93 ND(<50) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) <br />' 3/23/94 ND(<50) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) <br /> 6/7/04 ND(<50) ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 5) <br /> 9/8194 ND(<50) ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 5) <br /> 2/12/96 ND(<50) ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 5) <br /> 5/14/96 ND(<50) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) <br /> 9/17/96 ND(<50) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) <br /> 12/16/96 ND(<50) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) <br /> 7/15/97 ND(<50) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) <br />' MW-7 3/19/90 200 21 8 9 1 1 9 6 6 <br /> 5/24190 3,300 55 8 167 107 9 3 <br /> 9/17196 65 ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) <br /> 12/16/96 ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) <br /> 7/15/97 200 2 5 084 ND(<0 5) ND(<0 5) <br /> E \121382\1259771HISTLAB XLS XLS - 9/17/97 Page 2 of 4 <br />