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TABLE 4 <br /> . (Continued) <br /> RESULTS OF ANALYSES OF GROUNDWATER SAMPLES <br /> FROM MONITORING WELLS AT 152 and 153 EAST 11th STREET, TRACY <br /> Well Sampling TPH TVH Benzene Toluene Ethyl- Total <br /> No Date (as Gas ) benzene Xylenes <br /> ppb ppb ppb ppb ppb ppb <br /> ULT 1 04/01/87 - 3,700 13 80 ND <br /> 07/23/87 671 122 4 0 7 0 24 <br /> 07/03/91 160 - 3 5 ND 0 7 2 3 <br /> 09/30/91 350 - 15 ND 0 8 4 0 <br /> 12/31/91 320 _ 13 1 1 0 9 3 7 <br /> 03/28/92 470 - 11 0 8 0 7 5 0 <br /> 07/08/93 110 - 2 1 0 6 ND 1 3 <br /> ULT 2 04/01/87 - 30,000 1,700 1,800 72 <br /> 07/23/87 1,418 317 8 98 138 <br /> 07/02/91 4,700 - 98 37 48 100 <br /> 09/30/91 12,000 - 540 44 130 140 <br /> 12/31/91 28,000 - 190 86 140 300 <br /> 03/28/92 4,400 - 80 56 78 150 <br /> 07/08/93 9,800 - 1500 ND 170 150 <br /> • ULT 3 04/01/87 - ND ND ND _ <br /> 07/23/87 _ ND <br /> 160 120 70 ND ND <br /> 07/02/91 ND - ND ND ND 0 9 <br /> 09/30/91 ND - ND ND ND ND <br /> 12/31/91 ND - ND ND ND ND <br /> 03/28/92 ND - ND ND ND ND <br /> 07/08/93 ND - ND ND ND ND <br /> ULT 4 04/14/87 4,000 1,700 200 200 600 400 <br /> 07/23/87 252 117 14 15 19 <br /> 07/03/91 880 - 120 1 8 8 1 25 <br /> 09/30/91 580 - 65 0 6 4 2 8 3 <br /> 12/31/91 370 - 22 ND 0 7 0 8 <br /> 03/28/92 310 - 16 0,8 0 6 1 2 <br /> 07/08/93 370 - ND ND ND ND <br /> ULT 5 04/14/87 12,000 3,200 200 200 100 300 <br /> 07/23/87 1,102 43 6 83 70 <br /> 07/03/91 1,000 - 8 9 18 15 52 <br /> 09/30/91 2,000 - 7 8 6 8 6 4 17 <br /> 12/31/91 600 - 2 2 2 6 3 4 4 9 <br /> 03/28/92 920 - 7 4 ND 2 9 3 2 <br /> 07/08/93 180 - 4 5 ND 1 8 2 8 <br />. Continued on next page <br />