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t b <br /> Table 2. Analytical Results-Groundwater Samples, <br /> April 1987 through January 1989 <br /> Concentrations, <br /> micrograms per liter QP TPH, 10 <br /> Monitoring milligrams <br /> well number Date Benzene Ethylberizene Toluene Xylene per liter <br /> W-1 April 1987 120 <1.0 <1.0 <1.0 120 <br /> July 1987 180 <2.5 200 190 <0.9 <br /> November 1987 1,600 1,400 2,300 6,900 147.2 <br /> January 1989 3,680 130 740 x,280 - <br /> W-2 Apri11987 4,100 680 9,200 5,500 64 <br /> July 1987 14,000 2,300 25,000 16,000 281.7 <br /> November 1987 6,200 5,600 5,300 13,000 343.9 <br /> June 1988 3,570 755 3,900 3,000 -- <br /> Sept/Oct 1988 260 110 500 410 -- <br /> January 1989 4,400 510 4,540 2,740 -- <br /> W-2A June 1988 437 140 937 672 -- <br /> Sept/Oct 1988 55.8 6-4 16.3 15.3 -- <br /> January 1989 760 11 220 214 -- <br /> W-2B June 1988 290 13 410 397 -- <br /> Sept/Oct 1988 0.9 <O-f 15.7 2.3 -- <br /> January 1989 <0.5 <0.4 2.0 <0.5 -- <br /> W-3 April 1987 30,000 1,80C 38,000 14,000 180 <br /> July 1987 12,000 2,40C 23,000 15,500 227.3 <br /> November 1987 3,400 2,70C 3,200 8,500 ' 176.9 <br /> Sept/Oct 1988 10.3 Ls 14.8 9.5 -- <br /> January 1989 2,250 21 4,320 2,600 -- <br /> W-4 July 1987 1.6 0. <0.5 10 <0.9 <br /> November 1987 2 9 32 <0.2 <br /> February 1988 <0.5 <0. <0.5 <0.5 -- <br /> Sept/Oct 1988 <0.5 <0.Z <0.5 <0.5 -- <br /> January 1989 <0.5 <0_ <0.5 <0.5 -- <br /> W-5 July 1987 0.8 0-6 1.2 5 <0.9 <br /> November 1987 1 <0. <0.5 2 <0.2 <br /> February 1988 2 <0. <0.5 <0.5 -- <br /> Sept/Oct 1988 <0.5 <0_ <0.5 <0.5 -- <br /> January 1989 4.2 <0. <0.5 <0.5 -- <br />