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DRAFT <br /> TABLE 3 <br /> COMPARISON OF DETECTED CONCENTRATIONS IN SOIL <br /> TO U.S. EPA REGION IX PRELIMINARY REMEDIATION GOALS <br /> Pombo Property <br /> Tracy, California <br /> Results in milligrams per kilogram(mg/kg) <br /> U.S.EPA <br /> Range of Detected Region IX <br /> Chemical Concentrations PRGs' <br /> Residential <br /> Volatile Organic Compounds <br /> Benzene <0.005 0.62 <br /> Toluene 1.6-7.5 5202 <br /> Ethylbenzene 0.035-1.3 2302 <br /> Xylenes 0.07-3.4 2102 <br /> Polynuclear Aromatic Hydrocarbons <br /> Naphthalene 3.3 55 <br /> Acenaphthene 0.034-0.76 2600 <br /> Fluorene 0.095-3.9 1800 <br /> Phenanthrene 0.053-5.1 14,0003 <br /> Fluoranthene 0.029—0.098 2000 <br /> Pyrene 0.093-0.27 1500 <br /> Chrysene 0.14-0.54 56(6.1 <br /> Benzo(a)anthracene 0.035-0.13 0.56(0.34)4 <br /> Notes: <br /> ' U.S.EPA Region IX,Preliminary Remediation Goals(PRGs)for residential soil, <br /> 1998. When available,California modified PRG is shown in parentheses. <br /> 2 PRG is based on theoretical soil saturation concentration,not human healthrisk. <br /> 3 A PRG has not been developed for phenanthrene;the PRG for anthracene was <br /> used based on similar physical and chemical structure <br /> ° A California modified PRG was not provided for this chemical in the U.S.EPA <br /> PRG table. A California modified value was calculated by Geomatrix based on <br /> the methodology provided in the PRG documentation. <br /> I <br /> I:\DOC_SAFE15000S\5650\POMBO\POM-SOIGG W-OCT99-COMPARE-T3.DOC <br /> i <br />