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' r <br /> TABLE 4 <br /> (Continued) <br /> RESULTS OF ANALYSES OF GROUNDWATER SAMPLES <br /> FROM MONITORING WELLS AT 152 and 153 EAST 11th STREET, TRACY, CALIFORNIA <br /> Well Sampling TPH NH Benzene Toluene Ethyl- Total <br /> No Date las Gas ) benzene Xylenes <br /> ppb ppb ppb ppb ppb ppb <br /> ULT 8 4/14/87 2,0000 ND ND ND ND ND <br /> 7/23/87 - ND ND ND ND ND <br /> 7/3/91 Pluged Pluged Pluged Pluged Pluged Pluged <br /> 9/30/91 Pluged Pluged Pluged Pluged Pluged Pluged <br /> 12/31/91 Pluged Pluged Pluged Pluged Pluged Pluged <br /> 3/28/92 Pluged Pluged Pluged Pluged Pluged Pluged <br /> 7/8/93 ND - ND ND ND ND <br /> ULT 9 7123/87 - 31,619 3,954 10,526 1,627 8,358 <br /> 7/3/91 13000 - 610 1,400 310 13,000 <br /> 9/30/91 7500 - 600 570 140 7,500 <br /> 12/31/91 7200 - 520 570 120 7,200 <br /> 3/28/92 17000 - 860 1,000 850 17,000 <br /> 7/8/93 1900 - 240 190 34 240 <br /> ND = Not detectect above the Method Detection Limit <br /> - = Not analyzed for the subject analyte <br />