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27 May 1992 <br /> (GeoAudit MDC Ukiah-1. 9) <br /> Page 3 of 5 <br /> PHASE II EXCAVATION <br /> An additional 100 cubic yards of contaminated soil were excavated <br /> on 1 April 1992 . The soil was removed along the western portion of <br /> the excavation (Figure 3) , where the underground tanks were <br /> reportedly located. <br /> The sampling and analytical protocol were the same as previously <br /> described. <br /> PHASE III EXCAVATION <br /> An additional 150 cubic yards of contaminated soil were excavated <br /> on 29 April 1992 . The soil was removed from the north and west <br /> portions of the excavation (Figure 3) . <br /> I <br /> The sampling and analytical protocol were the same as previously <br /> described. <br /> All excavated soil was transferred to- two treatment cells in the <br /> south and west portion of the property. <br /> FINDINGS <br /> Very moist to saturated conditions were encountered at a depth of <br /> 10 - 11 feet during excavation. <br /> Samples from the east wall of the excavation (EW-0 to EW-120) <br /> showed TPH at levels ranging up to 160 µg/g. TPH contamination was <br /> detected at 750 gg/g in sample EW-50. Benzene was not detected in <br /> any of the samples. Toluene, ethylbenzene and xylenes were detected <br /> at levels ranging up to 6 Ag/g in all samples except EW-50. Sample <br /> EW-50 showed significantly higher levels of these constituents <br /> (toluene at 1. 3 µg/g; ethylbenzene at 8 pg/g; xylenes at 28 gg/g) . <br /> In the southwest portion of the excavation TPH was detected in <br /> samples SW-20 and SW-30 (30 µg/g and 7 . 2 µg/g, respectively) . <br /> Benzene was detected in samples SW-40 (0. 006 gg/g) and SW-50 <br /> (0. 0061 Ag/g) . During the second phase of excavation, this area was <br /> resampled (sample WW-2) and benzene was not detected in this <br /> sample. Toluene was detected in three samples (SW-20, SW-40, SW-50) <br /> at levels ranging up to 0. 12 µg/g. Ethylbenzene was detected only <br />. in sample SW-20 (0. 18 µg/g) . Xylenes were detected in Samples SW- <br /> 20, SW-40 and SW-50 at levels up to 0.77 gg/g <br /> C <br /> In the northern portion of the excavation, TPH as gasoline was <br /> detected along the property line in samples NW-10 and NW-20 at 420 <br />