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1
<br /> DRAFT
<br /> concentrations of trace and major elements in California soils (Bradford et al., 1996).
<br /> Although results varied for each area, for purposes of this risk evaluation, metals
<br />' considered to be present at or below background concentrations in soil included:
<br /> aluminum,barium,beryllium, chromium, cobalt, molybdenum,m6kel, silver, and
<br /> vanadium. Where an area-specific metal was less than the background concentration, the
<br /> chemical was not considered to be a COC. Where an area-specific metal was greater than
<br /> 1 the background concentration, the chemical was considered a COC.
<br /> ' All detected semi-volatile organic compounds (SVOCs) and volatile organic compounds
<br /> (VOCs)were considered to be COCs. Following the exclusion of chemicals as described
<br /> above, the chemicals detected in soil and groundwater, and considered to be COCs for
<br /> this risk evaluation included: VOCs, SVOCs, and metals. Specific COCs selected for
<br /> ' each area are listed below and presented in Table 8.
<br /> Area 2A:
<br /> • VOCs: benzene, toluene, ethylbenzene, xylenes(total), n-butyl benzene, sec-
<br /> butyl benzene, isopropylbenzene, n-propyl benzene, tetrachloroethene(PCE),
<br /> 1,2,4-trimethylbenzene
<br /> • SVOCs: naphthalene, anthracene,benzo(b)fluoranthene, fluoranthene,
<br /> fluorene, 2-methyl naphthalene,bis-2-ethylhexyl phthalate
<br /> • Metals: arsenic, cadmium, copper, lead,mercury,thallium, and zinc
<br /> Area 2B:
<br /> • VOCs: toluene, ethylbenzene, xylenes (total)
<br /> • SVOCs: benzo(a)anthracene,benzo(b) fluoranthene,benzo(k)fluoranthene,
<br /> benzo(a)pyrene, benzo(g,h,i) perylene, chrysene, fluoranthene, indeno(1,2,3)
<br /> pyrene, lead
<br /> SOMA 99-2218 2 12/10/99
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