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GEpN/Ip'TI-tIX <br /> 2.3 REMEDIAL INVESTIGATION ACTIVITIES COMPLETED TO DATE <br />' Since the UST's were removed in 1988, the Port has conducted various site investigations as <br /> requested by the PHS/EHD These investigations and the results are summarized in the <br />' following sections <br /> 1988 <br /> During removal of the UST's in 1988, approximately 180 cubic yards of soil were excavated <br /> with the tanks to a depth of about 11 feet bgs (B&R, 1998) Discolored gray soil with strong <br />' petroleum odors was observed at the southern ends of the tanks Soil samples were collected <br /> near the ends of the UST's from depths of approximately 13 and 16 feet bgs No groundwater <br />' was encountered during excavation or sampling to a depth of 16 feet bgs <br />' These soil samples were analyzed for total petroleum hydrocarbons quantified as gasoline <br /> (TPHg), total petroleum hydrocarbons quantified as diesel, benzene, toluene, and xylenes <br />' Selected samples were analyzed for ethylene dibromide (EDB) and for total lead Analytical <br /> results indicated detections of one of more of these petroleum hydrocarbon compounds in <br /> some of the soil samples EDB was not detected in these samples Lead was reported in the <br /> 13-foot samples collected from the north ends of both tanks, but was not detected in the other <br /> samples collected <br /> 1998 <br /> In 1998, the PHS/EHD requested that the Port investigate the extent of contamination at the <br /> site. The Port collected soil samples at 5-foot depth intervals between about 10 5 and 40 5 feet <br /> bgs from bonngs B3-1,133-2, and B3-3 (Figure 2) (B&R, 1998) TPHg, benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) were detected in a single soil sample in each boring <br /> collected between about 15 5 and 20 5 feet bgs These three soil samples were also analyzed <br /> tfor oxygenates, which were not detected in the samples TPHg, BTEX, and methyl tertiary <br /> butyl ether (MtBE) were not detected in the other soil samples collected from these borings <br /> Since the former USTs contained unleaded gasoline, a PHS/EHD representative provided <br /> verbal authorization on August 7, 1998, that analysis for total lead would not be required for <br />' this site <br /> BTEX and/or TPHg were detected in the grab groundwater samples collected at about 22 feet <br /> bgs from B3-1 and at about 13 and 31 feet bgs from B3-2. BTEX and TPHg were not <br /> • detected in the grab groundwater sample collected at about 12 feet bgs from B3-3 The grab <br /> 1 <br /> I TROJECI16WOA6437 00016437-08 doc 3 <br />