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Table 2. Trace Element Analyses <br /> Trace Element B-3-11.5 B-4-11.5 B-6-11.5 <br /> mg/kg mg/kg mg/kg <br /> Antimony ND ND NA <br /> Arsenic 2.1 2.0 NA <br /> Barium 160 180 NA <br /> Beryllium ND ND NA <br /> Cadmium 0.57 0.60 NA <br /> Chromium 18 21 15 <br /> Cobalt 69 7.9 NA <br /> Copper 18 17 15 <br /> Lead 2.4 3.6 4.0 <br /> Molybdenum ND ND NA <br /> Nickel 17 20 16 <br /> Selenium ND ND NA <br /> Silver ND ND NA <br /> Thallium ND ND NA <br /> Vanadium 27 29 NA <br /> Zinc 32 32 30 <br /> Mercury ND ND NA <br /> ND-None Detected NA Not Analyzed <br /> Discussion <br /> Parcels 5 and 6 have been associated with railroad use for a considerable period of time. <br /> Parcel 5 is currently a flat lot with one building on the western property line. Borings HA- <br /> 4 and HA-5 revealed an artificial backfill of sand and concrete and asphalt rubble, which <br /> appeared as radar anomalies. It is surmised that these were formerly railway structures and <br /> ballast which have been removed and backfilled. Boring B-2 near the concrete pad(the <br /> former underground storage tank location) revealed petroleum contaminants in the soil and <br /> sediments at depths of 10-to 20-feet. The most heavily contaminated depth interval <br /> occurred at about 15- to 16-feet. Chemical data shows that these contaminants were <br /> apparently gasoline and are highly degraded at he 10-foot and 20-foot depths. While <br /> elevated levels of TPHG occur at 15-feet, Benzene was not detected and Toluene, <br /> Ethylbenzene and Xylenes were degraded compared to the TPHG value. Values of TPHG <br /> and BTEX were very low at the 21.5-foot interval, indicating attenuation and degradation. <br /> These contaminants were not observed in Borings B-3 and B-4, and suggest that the spill <br /> has not migrated laterally a large distance. In our opinion, this is a relatively old leak/spill <br /> and is undergoing biodegradation processes. <br /> The area of the reported former battery storage area was a backfilled area next to the <br /> existing building. The artificial fill is composed of ruble and mixed soil types, and extends <br /> several feet below the surface. Soil pH indicates a relatively neutral value of 6, and <br /> evidence of contaminants (staining or bleaching) was not observed in samples or drill <br /> cuttings. VQC were not detected and values for trace elements are considered typical for <br /> the soils and geology of this region of the San Joaquin Valley (Shacklette and Boerngen, <br /> 1984). <br /> Page 4 <br />