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�✓ Table 4 �J <br />Historical Groundwater Sample TPH-G and BTEX Analytical Results <br />The Earthgrains Company <br />Stockton, California <br />Well Date <br />Concentration (ug/1) <br />I TPH-G Benzene Toluene Ethylbenzene Total Xylenes <br />PZ -2 10/27/1994 <br />31,000 <br />5,300 <br />3,300 <br />1,400 <br />5,700 " <br />(see note) 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 />07/02/2000 <br />13,000 <br />60 <br />76 <br />470 <br />1,200 <br />10/19/2000 <br />17,000 <br />81 <br />100 <br />450 <br />1,500 <br />01/18/2001 <br />6,200 <br />14 <br />25 <br />230 <br />650 <br />04/20/2001 <br />27,000 <br />200 <br />110 <br />450 <br />1,800: <br />07/19/2001 <br />16,000 <br />35 <br />74 <br />320 <br />1,100 <br />10/23/2001 <br />14,000 <br />140 <br />18 <br />220 <br />620 <br />ND Not detected at or above laboratory detection limit shown in parentheses. <br />TPH-G Total petroleum hydrocarbons as gasoline. <br />ug/I 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 />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 />env/62400132/ 121382eg/stockton/hi stl ab <br />