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Table 4 <br /> Historical Ouarterly Groundwater Sample Analytical Results <br /> The Earth Grains Company <br /> Stockton, California <br /> Concentration (ug/1) <br />' Well Date TPH-G Benzene Toluene Ethylbenzene Total Xylenes <br /> MW-12 3/23/94 ND(<50) ND(<O 5) ND(<O 5) ND(<0 5) ND(<O 5) <br /> 6/7194 ND(<50) 045 ND(<O 3) 082 1 6 <br /> 918/94 ND(<50) ND(<O 3) 0 81 069 2 8 <br /> 2/12/96 310 3 1 5 2 4 11 <br /> 5/14/96 600 7 4 1 8 16 19 <br />' 12/16/96 900 16 3 1 27 4 3 <br /> 7/15/97 2,000 8 5 2 6 12 NO(<2 5) <br />' MW-13 3/23/94 6,500 99 19 30 330 <br /> 6/7/94 7,100 150 26 42 420 <br /> 9/8/94 6,800 160 24 51 150 <br />' 2112196 2,600 49 6 20 78 <br /> 5115/96 5,000 65 32 41 74 <br /> 9116/96 2,100 21 18 8 6 27 <br />' 12/16/96 69 ND(<O 5) 1 6 ND(<0 5) 1 3 <br /> 7/15/97 ND(<50) ND(<0 5) ND(<O 5) ND(<0 5) ND(<O 5) <br /> ND Not detected at or above laboratory detection limit shown in parentheses <br /> TPH-G Total petroleum hydrocarbons as gasoline <br /> ug/l Micrograms per liter <br /> I <br /> I <br /> E 1121382\1259771HISTLAB XLS XLS - 9/17/97 Page 4 of 4 <br />