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Table 9 ' Historical Benzene Concentrations in Groundwater The Earthgrains Company Stockton California Monitoring Well ID/Concentration(ug/1) 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 7/10/871 6,800 ND(0 3) ND(0 3) 75 4!26!88 F 2 300 19 ND(0 3) 3119/90 5 120 ND(0 3) ND(0 3) ND(0 3) ND(0 3) ND(0 3) 558 12/20/90 7 100 ND(0 3) ND(0 3) ND(0 3) ND(0 3) 419192 1,620 8 ND(0 3) ND(0 3) ND(0 5) 8119192 4,720 ND(0 3) 12/23/92 2 650 ND(0 5) 417193 2 300 ND(0 3) ND(0 3) 7/301931 1,900 ND(0 3) ND(0 3) ND(0 3) 10/21/931 2,200 ND(0 3) ND(0 3) 12/29/93 1,700 ND(0 3) ND(0 3) 3/23194 2000 ND(0 3) ND(0 3) 230 ND(0 3)1 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 92 ND(0 3) ND(0 3) 160 2112196 2 400 ND(0 3) ND(0 3) 75 ND(0 3) ND(0 3) ND(0 3) ND(0 3) 3 1 49 5114/96 960 ND(0 5) ND(0 5) 66 ND(0 5) ND(0 5) 1 2 ND(0 5) 74 65 9/18/96 890 ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 5 5 21 12/18/96 780 ND(0 5) ND(0 5) 54 ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 16 ND(0 5) 7/15197 820 ND(0 5) ND(0 5) ND(0 5)1 ND(0 5) ND(0 5) 25 ND(0 5) ND(0 5) 14 ND(0 5) 85 ND(0 5) 10/23/97 500 ND(0 5) ND(0 5) ND(0 5) ND(0 5) NS 16 ND(0 5) NS 066 ND(0 5) 32 ND(0 5) 1129198 950 NS NS NS NS NS ND(5 0) ND(5 0) NS ND(5 0) NS 17 ND(5 0) 5121198 620 NS NS NS ND(10) NS ND(10) ND(10) NS NS ND(10) 26 NS 10/28/98 170 ND(0 5)1 NS 1 1 ND(0 5) NS ND(0 5) ND(0 5) NSI 10 ND(6 5) 11 ND(0 5) 5/28199 240 ND(0 5)1 ND(0 5) ND(0 5) ND(0 5)1 ND(0 5)I ND(0 5)F ND(0 5) ND(0 5)1 281 ND(6 5) 18 ND(0 5) Results reported in micrograms per liter of detected at or above the laboratory detection limit shown in parentheses of sampled I I 1 • 1 ' E kl21382\1259971Histbenz XLS-6118199 Page 1 of 1