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Table 4 Historical Groundwater Concentration Summary Rambo/Earth Grains Facility Stockton, California MonitoringWell ID/Concentration (u n) Parameter 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 Date Mo itoring Well ID/Concentration (u 11) Parameter MWA MW-2 MW-3 MW-4 MW-5 MW-6 MW-7 MW-8 MW-9 MW-10 MW-11 MW 12 MW 13 BENZENE 7110187 6,800 ND(<0 3) ND(<0 3) 75 4126188 2,300 19 ND(<0 3) 3119190 5,120 ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 3) 55 8 12/20/90 7,100 ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 3) 4/9192 1,620 8 ND(<0 3) ND(<0 3) ND(<0 5) 8119192 4,720 ND(<0 31 12/23/92 2,650 ND(<0 5) 417193 2,300 ND(<0 3) ND(<0 3) 7130193 1,900 ND(<0 3) ND(<0 3) ND(<0 3) 10/21/93 2,200 ND(<0 3) ND(<0 3) 12/29/93 1,700 ND(<0 5) ND(<0 3) 3123194 2,000 ND(<0 5) ND(<0 5) 230 ND(<0 5) ND(<0 5) ND(<0 5) 17 ND(<0 5) ND(<0 5) 99 617194 1,500 046 ND(<0 3) 210 ND(<0 3) ND(<0 3) ND(<0 3) 43 052 045 150 918194 1,500 21 ND(<0 3) 180 ND(<0 3) ND(<0 3) 052 921 ND(<0 3)l ND(<0 3) 160 2112196 2,400 ND(<0 3) ND(<0 3) 751 ND(<0 3) ND(<0 3) ND(<0 3) ND(<0 3)1 31, 49 5114196 960ND(<0 5) ND(<0 5} fib ND(<0 5) ND(<0 5) 1 2 ND(<0 5) 7 4 65 9118196 780 ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) ND(<0 5) 65 21 8000- v 7 000 B oOD i V Y L x v, -�MW-1 -MW-2 ry ui, crr`. , Yh —A MW-3 Z 5 000 O h r.o~, x„ x~ v L, . ✓ w a n n` --)(—MWA 4000 �* MW 5 Z 3004 ,ri frxi ,w x rmrw :o `iuY �w r ,r'r%r {,A,ya �—'MWb LLI L , G —l—MW 7 z20 pp K w a ri ---MW-8 O L L (� 10001 r ` —MW-9 o -0 Mw-10 rn o� BMW-11 r� v N —A MW-12 n �F MW-13 DATE ND Not detected at or above laboratory detection limit shown in parentheses NS Not sampled TVH-G Total volatile hydrocarbons as gasoline ugll Micrograms per liter E\121382\1259771HISTLABA XLS XLS- 10/16/96 Page 2 of 2