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Historical Benzene Concentrations in Groundwater <br /> Rainbo/Earth Grains Facility <br /> Stockton,California <br /> Moni oring Well I D/Concentration u 1 <br /> 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 <br /> Benzene 7/10/87 6,800 ND(O 3 ND(O 3 75 <br /> 4/26/88 2,300 19 ND(O 3 <br /> 3/19/90 5,120 ND03 ND03 ND03 ND03 ND03 558 <br /> 12/20/90 7,100 ND(O 3 ND(O 3 ND(O 3 ND(O 3 <br /> 4/9/92 1,620 8 ND03 ND03 NDG5 <br /> 8/19/92 4,720 ND(O 3 <br /> 12/23/92 2,650 ND(O 5 <br /> 4/7/93 2,300 ND(O 3 ND(O 3 <br /> 7/30/93 1,900 ND(O 3 ND(O 3 ND(O 3 <br /> 10/21/93 2,200 ND(O 3 ND(O 3 <br /> 12/29/93 1,700 ND(O 3 ND(O 3 <br /> 3123/94 2,000 -ND(O 3 ND(O 3 230 ND(O 3 ND(O 5), ND(O 5 17 ND(O 5), ND(O 5 99 <br /> 6/7/94 1,500 046 ND(O 3 210 ND(O 3 ND(O 3 ND(O 3 43 0 52 045 150 <br /> 9/8/94 1,500 2 1 ND(O 3 180 ND(O 3 ND(O 3 0 52 9 2 ND(O 3 ND(O 3 160 <br /> 2/12/96 2,400 ND(O 3 ND(O 3 75 ND(O 3 ND(O 3 ND(O 3 ND(O 3 31 49 <br /> 5/14196 960 ND05 ND05 66 ND05 ND05 121 ND05 741 65 <br /> 9/18/96 890 ND05 ND05 ND05 ND05 ND05 ND05 ND05 55 21 <br /> 12/18/96 780 ND05 ND05 54 ND05 ND05 ND05 05 NDEND05 NI (0 ND05 lal ND05 <br /> 8000 �___ _ti -_�-_-_ _ --_ ____ --- -------�- , 250 <br /> 7000 <br /> +MW 1 <br /> 6 000 <br /> _ 200 '-40---MW-2 <br /> � 6-MW3 <br /> 5,000 <br /> 150 2 0 MW-4 <br /> v V -F MW 5 <br /> 0 4000 I - - - _ -_ _ -__ _ _�,--- -rMW� <br /> 3 000 - - - =--- --- - - - -- ...___. 100 LL) <br /> - -M W-7 <br /> MWO <br /> lu <br /> 2000 -BMW-9 <br /> • _ _ _ 50 O - -MW-10 <br /> 1 000 � �_ - - _ --- - - - - - - - - - --- _rJ <br /> ` x MW-11 <br /> I <br /> 0 - M - 0 --*--MW 12 <br /> 7A 0187 3119190 419192 12/23/92 7/30193 12/29/93 6/7/94 2112196 9118196 L70-MW-13 <br /> DATE <br /> ND Not detected at or above laboratory detection limit shown in parentheses <br /> TVH-G Total volatile hydrocarbons as gasoline <br /> ug/I Micrograms per liter <br /> E 112138211259971HfSTBENZ XLS XLS-2/21/97 Page 1 of 1 <br /> I <br />