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Ci <br /> a 3 <br /> p. 6.0 DISCUSSION <br /> No TPH-G were detected in the samples obtained from boring <br /> B-5. Toluene was the only aromatic hydrocarbon detected in the <br /> samples from boring B-5 at concentrations ranging from 0.01 to <br /> 0.140 ppm. <br /> TPH-G were detected in all ten soil samples obtained from <br /> boring B-6, except sample B-6 @ 61 , at concentrations ranging <br /> from 5.5 to 5,400 ppm. Seven of the samples contained TPH--G <br /> concentrations ranging between 610 and 5,400 ppm, with an <br /> average concentration of about 2,700 ppm, Benzene (0.57 ppm) - <br /> was only detected in sample B-6 C 501 . Toluene (ranging from <br /> 0.05 to 250 ppm) was detected in all of the samples obtained <br /> from boring 8-6. Xylenes (ranging from 0. 15 to 860 ppm) and <br /> ethylbenzene (ranging from 0.008 to 170 ppm) were detected in <br /> all of the samples obtained from boring B-6, except sample <br /> B-6 @ 6' . <br /> It should be noted that the laboratory detection limits for: <br /> 1) benzene by the EPA Method 8020 ranged from 0.5 to 10 ppm; <br /> 2) VOCs by EPA Method 8240 ranged from 10 to 25 ppm; and <br /> 3) EOCs ranged from 0.67 to 3.4 ppm. These detection limits are <br /> high, and are reportedly associated with limitations of the <br /> NATER laboratory equipment. Therefore, it is possible that VOCs <br /> and EOCs are present in the samples at concentrations below the <br /> elevated laboratory detection limits. <br /> No organic lead was detected in any of the samples test-ed. <br /> Total lead analyses were conducted on the two samples which <br /> contained the highest TPH-G concentrations (B-6 @ 25' and <br /> B-6 @ 411) . Total lead concentrations ranged from 10.9 to 38.1 <br /> ppm. The soluble lead concentration for the sample with the <br /> highest total lead concentration (B-6 @ �5') was 0.96 ppm. The <br /> total and soluble lead concentrations are well below the <br /> standards contained in Title 22, California Code of Regulations. <br /> - No TPH--G or BTXE were detected in the equipment 'clank. <br /> Toluene was the only compound detected in the trip blank at a <br /> concentration of 0.0011 ppm. The presence of this compound in <br /> the trip blank could be the result of EAI sample handling <br /> procedures or the result of laboratory induced contamination. <br /> Regardless of the source, the effect on the quality of the <br /> analytical data is not considered significant. <br /> Project No. 1232 -7- <br /> L AUDIAV, <br />