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higher than that for the other TPH compounds tested The laboratory qualified many of the <br /> TPH-diesel results as exhibiting fuel patterns that do not resemble the standard and/or that lighter <br /> or heavier hydrocarbons contributed to the quantitation (Table 4) This may indicate the <br /> presence of aged or weathered fuel or that a broader middle distillate product is present <br /> The highest concentrations of MTBE and BTEX were detected in shallow groundwater samples <br /> collected offsite on the Tracy Express Wash & Lube property(Table 4) MTBE was detected <br /> between <2 to 3,400 ppb Concentrations of benzene ranged from <0 5 to 2,500 ppb, toluene <br /> ranged from <0 5 to 2,500 ppb, ethylbenzene from <0 5 to 13,000 ppb, and total xylenes were <br /> detected between <0 5 to 16,100 ppb Benzene, ethylbenzene and total xylenes were detected at <br /> TR-17 and.MTBE, ethylbenzene, and total xylenes were detected at TR-18, both located <br /> 1 downgradient of the Chevron pipeline yet upgradient of the former Chevron Service Station <br /> lie 5.3.2 Deeper Groundwater Grab Results <br /> The deeper groundwater grab samples, TR-14 and TR-24, were collected at depths believed to be <br /> indicative of the deeper groundwater The contaminant levels in TR-14, located at the south end <br /> of the 541 Site, were significantly lower in the deeper groundwater sample versus the shallow <br /> tgroundwater sample (Table 4) TPH-het fuel was detected at 70 ppb and TPH-diesel was <br /> detected at 100 ppb in deep sample TR-14 <br /> The deeper groundwater sample collected at TR-24, located on the Tracy Express Wash & Lube <br /> ' site, contained contaminant concentrations orders of magnitude higher than the shallow sample <br /> from TR-24 Concentrations of TPH-jet fuel were detected at 12,000 ppb, TPH-gasoline at <br /> 20,000 ppb, TPH-diesel at 11,000 ppb, and TPH-motor oil was detected at 1,300 ppb BTEX <br /> was detected in deeper sample TR-24 including benzene at 25 ppb, ethylbenzene at 880 ppb, <br /> toluene at 8 8 ppb, and total xylenes at 1,000 ppb <br /> Field Investigation Report 15 8 December 2003 <br /> ' TREADWELL&ROLLO,INC <br />