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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/I) <br />keli Date TPH-G Benzene Toluene Ethylbenzene Total Xylenes <br />' PZ -1 <br />(see note) <br />1 <br />' PZ -2 <br />(see note) <br />10/27/1994 <br />21,000 <br />4,200 <br />2,500 <br />1,300 <br />4,800 <br />11/15/1994 <br />12,000 <br />1,800 <br />1,400 <br />350 <br />3,100 <br />08/18/1999 <br />21,000 <br />3,700 <br />2,800 <br />820 <br />3,500 <br />11/08/1999 <br />1,800 <br />190 <br />38 <br />87 <br />71 <br />03/13/2000 <br />1,400 <br />190 <br />84 <br />44 <br />170 <br />10/27/1994 <br />31,000 <br />5,300 <br />3,300 <br />1,400 <br />5,700 <br />11/15/1994 <br />25,000 <br />4,000 <br />3,000 <br />600 <br />4,800 <br />08/18/1999 <br />16,000 <br />230 <br />340 <br />760 <br />2,600 <br />11/08/1999 <br />1,300 <br />18 <br />24 <br />61 <br />170 <br />03/13/2000 <br />11,000 <br />31 <br />240 <br />250 <br />990 <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 />* Laboratory reports not typical of gasoline <br />'* BTEX results for these samples reported using EPA Method 8260B <br />TPH-G results reported using Method 8020/8015, but, these samples <br />were analyzed outside of recommended 14 day hold time <br />NT Not Tested <br />Note November 15, 1994 samples collected from piezometers PZ -1 and PZ -2 followed a 2 -week <br />' soil vent and air sparge pilot test performed in this area <br />1 <br />w <br />E 112138211259771Histlab XLS - 05/08/2000 <br />Page 6 of 6 <br />