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Job No 4780201 • 2 <br /> ' 5.0 RESULTS OF SAMPLE ANALYSES <br /> The results of soil and groundwater sample analyses are presented in Table 1 <br /> below and the laboratory issued analytical reports and corresponding chain-of- <br /> custody documents are presented in Appendix C. <br /> ' TABLE 1 - SAMPLE ANALYSES RESULTS <br /> ' Sample # TPHd TPHg Benzene Toluene Ethylbenzene Xylenes MTBE <br /> Soil Sample Results (in ppm) <br /> ' MW1-15' 64 234 <0.005 434 <0005 <0005 --- <br /> MW1-20' 48 1,70G <0.005 <br /> ' MW125 66 4,&00 4.5 14 12 .. <br /> MW130 52 1,&00 <0.005 5,1 8.? 48 <br /> MW1-40' .H 240.; II.S4 2.2 1.3 48 <br /> Groundwater Sample Results (in ppb) <br /> MW-1 <50 52,000 4B 1;}100 1,800'! 7, II0 ! <5.0 <br /> ppm = parts per million <br /> ppb = parts per billion <br /> ' The results of soil sample analyses indicate that elevated levels of TPHg (1,600 <br /> ' to 4,600 ppm) exist in the soil at depths of 20, 25, and 30 feet at the location <br /> of the former tanks. The TPHg level diminishes to 240 ppm at a depth of <br /> approximately 40 feet, which is where groundwater was first encountered <br /> during drilling operations (approximately 39 feet). <br /> Although elevated levels of TPHg were detected in the soil, groundwater was <br /> found to contain only 52,000 ppb TPHg, 46 ppb Benzene, and no detectable <br /> MTBE. These findings suggest that the silty and sandy clay material underlying <br /> ' the subject site has acted to limit the migration of contaminants from the soil to <br /> ' groundwater. Although floating product was not encountered in well MW-1, <br /> these detection's are elevated above the 500 ppb Taste and Odor Threshold for <br /> ' TPHg and the 1 ppb Maximum Contaminant Level (MCL) established for <br /> Benzene by the State of California Office of Drinking Water. <br /> ' EZC, Inc. September 18, 1997 <br />