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' Table 4 <br /> Historical Groundwater Sample TPH-G and BTEX Analytical Results <br /> The Earthgrams Company <br /> Stockton, California <br />` Concentration (ug/1) <br /> Well Date TPH-G Benzene Toluene Ethylbenzene Total Xylenes <br /> I5121198 NT 26 36 66 3 6 <br /> 10/28/98 1900 11 ND(5 0) 8 5 6 2 <br /> 5128199 2200 18 5 5 2 9 2 6 <br /> 1 MW-13 3/23/94 6,500 99 19 30 330 <br /> 617194 7,100 150 26 42 420 <br /> 918194 6,800 160 24 51 150 <br /> 2112196 2,600 49 6 20 78 <br /> 5115196 5,000 65 32 41 74 <br /> 9116196 2,100 21 18 8 6 27 <br /> 12/16/96 69 ND(0 5) 1 6 ND(0 5) 1 3 <br /> 7115197 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) <br /> 10/23/97 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) <br /> 1129198 NT ND(5 0) ND(5 0) ND(5 0) ND(5 0) <br /> 10/28/98 ND(50) ND(0 5) ND(0 5) ND(0 5) ND(0 5) <br />' 5128199 190* ND(0 5) ND(0 5) ND(0 5) ND(0 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 /> k Laboratory reports not typical of gasoline <br />' NT Not Tested <br /> i <br /> �I <br /> • <br />' E \121382\1259771Histlab XLS -6118/99 Page 5 of 5 <br />