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Underground Storage Tank and Product Line Replacement Report-Tosco 76 Branded Facility No. 11195
<br /> April 23, 1999
<br /> Groundwater grab sample CW was collected from groundwater within the indentation left in the
<br /> bottom of the excavation after the removal of the center UST. Each sample was analyzed for
<br /> TPHg, BTEX, MtBE, six oxygenate compounds, and total lead. Sample SW contained 8,400
<br /> parts per bilion (ppb) of TPHg, 310 ppb of benzene, 100,000 ppb of MtBE (EPA Method 8260),
<br /> 460 ppb of TAME, and was reported as not detected for ethanol, TBA, DIPS, EtBE, and total
<br /> lead. Sample CW contained 60,000 ppb of TPHg, 1,500 ppb of benzene, 130,000 ppb of MtBE
<br /> (EPA Method 8260), 870 ppb of TAME, and was reported as not detected for ethanol, TBA,
<br /> DIPE, EtBE, and total lead.
<br /> New Gasoline UST Excavation Sampling
<br /> Upon excavation of the new gasoline UST pit, two soil samples (X-1-16.5, and X-2-15.5) were
<br /> collected from the bottom of the excavation at depths of approximately 16.5 and 15.5 feet bgs,
<br /> respectively (Figure 3). The samples were analyzed for MtBE, six oxygenate compounds, and
<br /> total lead. Sample X-1-16.5 contained 1.9 ppm of MtBE by EPA Method $260, and was
<br /> reported as not detected for ethanol, TBA, DIPE, EtBE, TAME, and total lead. Sample X-2-
<br /> 15.5 contained 5.3 ppm of MtBE by EPA Method 8260, 3.5 ppm of total lead, and was reported
<br /> as not detected for ethanol, TBA, DIPE, EtBE, and TAME. The laboratory inadvertently failed
<br /> to analyze these samples for TPHg and BTEX.
<br /> Dispenser/Product Line Sampling
<br /> On December 30, 1998, ten soil samples (TT-1-3.5 through TT-10-3.5) were collected from
<br /> native soil immediately beneath the four dispenser locations and associated product piping at
<br /> depths ranging from 3 to 4 feet bgs (Figure 3). The soil samples were analyzed for TPHg,
<br /> TPHd, BTEX, MtBE, six oxygenate compounds, and total lead. TPHg, bnezene, or MtBE by
<br /> EPA Method 8260 were not detected in these samples.
<br /> Former Product Line Sampling
<br /> Three soil samples (TL-1-2.5, TL-2-3, TL-3-4) were collected from native soil immediately
<br /> beneath the former product line locations at depths ranging from 2.5 to 4 feet bgs on December
<br /> 31, 1998 (Figure 4). The soil samples were analyzed for TPHg, BTEX, MtBE, six oxygenate
<br /> compounds, and total lead. Sample TL-1-2.5 contained 50 ppm of unidentified hydrocarbons
<br /> greater than C9 in the range of TPHg, 14 ppm of total lead, and was reported as not detected for
<br /> all other analytes. Samples TL-2-3 and TL-3-4 were reported as not detected for all analytes
<br /> except for 0.17 ppm of MtBE (EPA Method 8020) and 1.6 ppm of total lead in TL-2-3 and 64.0
<br /> ppm of ethanol and 2.4 ppm of total lead in TL-3-4.
<br /> 140I93.03
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