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• TABLE 4 <br /> RESULTS OF ANALYSES OF GROUNDWATER SAMPLES <br /> FROM MONITORING WELLS AT 152 and 153 EAST 11th STREET, TRACY, CALIFORNIA <br /> Well Sampling TPH TVH Benzene Toluene Ethyl- Total <br /> No Date (as Gas ) benzene Xylenes <br /> Ppb ppb ppb ppb ppb ppb <br /> NAV 1 3/18/88 - 3,3000 97 0 2700 ND 1200 <br /> 1/20/93 ND - ND ND ND 1 7 <br /> 7/8/93 ND - 1 0 ND ND 2 0 <br /> NAV 2 3/18/88 - ND 4 0 ND ND ND <br /> 1/20/93 ND - ND ND ND ND <br /> 7/8193 ND - ND ND ND ND <br /> 10/13/93 ND - ND ND ND ND <br /> NAV 3 3/18/88 - 23,000 520 1,300 2,100 11,000 <br /> 1/20/93 1,300 - 37 20 7 1 160 <br /> 7/8/93 3,000 - 35 ND 74 130 <br /> NAV 4 3/18/88 - 40,000 900 6,600 1,900 15,000 <br /> 1/20/93 25,000 - 60 1,400 420 7,300 <br /> 7/8/93 3,800 - 24 43 O 9 700 <br /> 10/13/93 570 - 1 7 1 0 ND 31 <br /> NAV 5 7/8/93 ND - ND ND ND ND <br /> 10/13/93 ND - ND ND ND ND <br /> NAV 6 7/8/93 ND - ND ND ND ND <br /> 10/13/93 ND - ND ND ND ND <br /> NAV 7 7/8193 ND - ND ND ND ND <br /> 10/13/93 ND - ND ND ND ND <br /> NAV 8 718/93 ND - ND ND ND ND <br /> 10/13/93 ND - ND ND ND ND <br /> ULT 1 4/1/87 - 3,700 13 80 - ND <br /> 7/23/87 671 122 4 0 7 0 24 <br /> 7/3/91 160 - 3 5 ND 0 7 2 3 <br /> 9/30/91 350 - 15 ND O 8 4 0 <br /> 12/31/91 320 _ 13 1 1 0 9 3 7 <br /> 3/28/92 470 - 11 0 8 0 7 5 0 <br /> 7/8/93 110 - 2 1 0 6 ND 1 3 <br /> ULT 2 4/1/87 - 30,000 1,700 1,800 - 72 <br /> 7123/87 - 1,418 317 8 98 138 <br /> 7/2/91 4,700 - 98 37 48 100 <br /> 9/30/91 12,000 - 540 44 130 140 <br /> 12/31/91 28,000 - 190 86 140 300 <br /> 3/28/92 4,400 - 80 56 78 150 <br /> 7/8/93 9,800 - 1500 ND 170 150 <br /> Continued on next page <br />