ARCHIVED REPORTS XR0003301 - Laserfiche WebLink

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6 Laboratory results obtained from sampling activities associated with the surface excavation areas are summarized in Table 2 and are discussed in Sections 3 4 and 3 5 below A copy of the laboratory reports and Chain-of-Custody forms for the samples are included in Appendix C 3.1 FORMER DIESEL TANK EXCAVATION 1 Based on the results of sample ST-2D, the fine-grained native soil appears to have impeded the migration of hydrocarbons beyond the fill adjacent to and beneath the former diesel tank Approximately 6 to 8 feet of fill material was removed from the bottom of the tank cavity until native soil was encountered. The excavated soil was temporarily stockpiled onsite Seven additional samples were then collected from the newly exposed native soil at the bottom of the tank cavity Samples ST-2E, ST-2F and ST-2H were collected from the bottom of the cavity, samples ST-2G and ST-2K were collected from the northern sidewall, and samples ST-21 and ST-2J were collected from the southern sidewall Figure 3 shows the locations of the additional samples 2 The additional samples collected from the former diesel tank cavity were analyzed for the following • TPHd • BTEX • Total lead TPHd was reportedly not detected in samples ST-2E, ST-2H, ST-2I, and ST-2K Samples ST-2F, ST-2G and ST-2J were reported to contain 21 mg/kg, 3,300 mg/kg and 17 mg/kg of TPHd, respectively I 3 Due to the elevated concentration of TPHd (i e , 3,300 mg/kg) reported in sample ST-2G, an additional 1 foot of soil was removed along the sidewall in the area around sample ST-2G Sample ST-2L was then collected in the area of additional soil removal TPHd was reportedly not detected in sample ST-2L 4 BTEX were reportedly not detected in the additional samples from the former diesel tank cavity, with the exception of 0 049 mg/kg total xylenes reported in sample ST-2G (which had 3,300 mg/kg of TPHd) Total lead was reportedly not detected in the additional samples 5 ENVIRONMENTAL SOLUTIONS