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i. RIEDEL ENVIRONMENTAL <br /> SERVICES INC <br /> The 5 samples obtained during the fourth confirmatory sampling event were analyzed for TPHd <br /> by Argon. The results of the on-site analytical testing indicated that sample CD-03-1B contained <br /> 3400 ppm TPHd, sample CD-034C contained 8300 ppm TPHd, and sample CD-03-1D <br /> contained 110 ppm TPHd. Detectable concentrations of TPHd were not present in samples <br /> CD-03-IA or CD-03-1E. <br /> Six additional samples were obtained from the soils beneath the excavation bottom in areas of <br /> concern. Samples CD-04-1B, CD-05-1B, and CD-06-1B were obtained at depths of 23, 26, and <br />' 27.5 feet below grade beneath the location that sample CD-03-1B had been obtained. Sample <br /> CD44-1B contained 510 ppm. TPHd, sample CD-05-1B contained 120 ppm TPHd, and sample <br /> CD-06-1B did not contain detectable concentrations of TPHd. Samples CD-04-1C(&23', <br />' CD-05-ICQ26', and CD-064CO27.5' were obtained from the soils beneath the location that <br /> sample CD-034C had been obtained. Sample CD-04-1 QD23' contained 610 ppm TPHd, <br /> sample CD-05-1C@26' contained 250ppm TPHd, and sample CD-06-1CO27.5' did not contain <br />' detectable concentrations of TPHd. <br /> At the request of Ms. Meays, six soil samples were obtained from the northern sidewall of the <br /> t excavation. Samples SW-01-15.5 and SW-02-15-0.5 were obtained from the northern sidewall <br /> at depths of 15 feet below grade. Sample SW-01-15-3 was obtained at a depth of 15 feel below <br /> grade and 3 feet into the sidewall from sample SW-01-15.5 utilizing the manually augering <br />' equipment. Samples SW-03-3-19, SW-03-19-6.5',and SW-03-19-8.5 were obtained 3, 6.5, and <br /> 8.5 feet into a hole manually augered at a 45 degree angle at the bottom of the northern <br /> sidewall. The locations of the sidewall samples are shown on Figure 6. <br /> The sidewall samples were analyzed for TPHd. The results of the analysis indicated that <br /> samples SW-01-15.5, SW-01-15-3, and SW-02-15-0.5 did not contain detectable concentrations <br />' of TPHd. Sample SW-03-3-19 contained 1800 ppm TPHd, sample SW-03-19-6.5'contained 280 <br /> ppm TPHd, and sample SW-03-19-8.5 did not contain detectable concentrations of TPHd. <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 4035-931511P1P9_3T0KN.RMjMAX% 5 <br />