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�7 Historical Benzene Concentrations in Groundwater The Earthgrains Company Stockton,California Monitoring Well ID/Concentration(ug1l) Date MW-1 MW-2 MW-3 MW-4 MW-5 MW-6 MW-7 MW-8 MW-9 MW-10 MW-11 MW-12 MW-13 7110187 6,800 ND(O 3) ND(O 3) 75 4/26188 2,300 19 ND(O 3) 3119/90 5,120 ND(0 3) ND(0 3} ND(O 3) ND(O 3) ND(O 3) 558 12120/90 7,100 ND(O 3) ND(O 3) ND(O 3) ND(O 3) 4/9192 1,620 8 ND(O 3) ND(O 3) ND(O 5) 8119192 4,720 ND(O 3) 12/23/92 2,650 ND(O 5) 4171931 2,300 ND(O 3) ND(O 3) 7130193 1,900 ND(O 3) ND(O 3) ND(O 3) 10/21/93 2,200 ND(O 3) ND(O 3) 12/29/93 1,700 ND(O 3) ND(O 3) 3123194 2,000 ND(O 3) ND(O 3) 230 ND(O 3) ND(O 5) ND(O 5) 17 ND(0 5) ND(O 5) 99 617194 1,500 6-46 ND(O 3) 210 ND(O 3) ND(O 3) ND(O 3) 43 052 045 150 918194 1,500 21 ND(O 3) 180 ND(O 3) 1 ND(O 3) 052 92 ND(O 3) ND(O 3) 160 2112196 2 400 ND(O 3) ND(O 3) 75 ND(O 3) ND(O 3) ND(O 3) ND(O 3) 31 49 5114196 960 ND(O 5) ND(O 5) 66 ND(O 5) ND(O 5) 12 ND(O 5) 74 65 9118/96 890 ND(O 5) ND(O 5) ND(O 5) ND(O 5) ND(O 5) ND(O 5) ND(O 5) 55 21 12/18/96 780 ND(O 5) ND(O 5) 54 ND(O 5) ND(O 5) ND(O 5) ND(0 5) ND(O 5) ND(O 5) ND(O 5) 16 ND(O 5) 7115197 820 ND(O 5)1 ND(O 5) ND(O 5) ND(0 5) ND(O 5) 25 ND(O 5) ND(O 5) 14 ND(0 5)l 85 ND(0 5) 10/23197 500 ND(O 5)1 ND(O 5)1 ND(O 5) ND(O 5)1 NS 161 ND(O 5) NS 0661 ND(O 5)1 32 ND(O 5) +MW 1 8 000 _ 250 --F MW 2 7 000 200 7 �—MW-3 6000 0-MW-4 x 150 -r--MW 5 5000 - -- r O €' '� v X MW-6 4000 100 —BMW-7 v LU Fv 3000 i8 ��-°� `'p3 �a -�MW8 v 2,000 MW 9 r 1000 u; � O —1-MW-10 0 0 --K MW-11 A\9\9y \��\9y \9n ��\N� ,�\�1 ^\�3 \�� \\�a ��\9r g\�9° ��0 ^a\� \��\P ^�\0 \14, �� —0—MW 12 1\ p 0 1 o I h\ 9 �� 1 I& DATE ND Not detected at or above laboratory reporting limit shown in parentheses TPH-G Total volatile hydrocarbons as gasoline ug/L Micrograms per liter NS Not Sampled E 112138211259971Histbenz As XLS-12/1197 Page 1 of 1