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Mr. Geoffrey Rader
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<br /> summarized in Table 8 and soil vapor laboratory analytical data has been summarized in Table 9.
<br /> Waste Disposition
<br /> On November 21, 2018, 575 gallons of accumulated purge water was transported by American
<br /> Valley Waste Oil, Inc. to the DK-Dixon facility in Dixon for disposal/recycling. A copy of the
<br /> non-hazardous waste manifest in included in Attachment D.
<br /> GROUNDWATER ANALYTICAL RESULTS
<br /> Groundwater samples from wells MW3, MW6R, MW7, MW8, MW9R, MW 13 and VEW 1-D
<br /> were analyzed by BC. TPHg was detected in the sample from well MW3 at a concentration of 21
<br /> parts per billion (ppb). A low level of ethylbenzene was also present. TPHg and benzene were
<br /> detected in the sample from well MW6R at concentrations of 2,800 ppb and 330 ppb,respectively.
<br /> Low to moderate levels of toluene, ethylbenzene and xylenes were also present. TPHg was
<br /> detected in the sample from well MW7 at a concentration of 8.5 ppb. No BTEX compounds were
<br /> present in the sample from well MW7. TPHg and benzene were detected in the sample from well
<br /> MW8 at concentrations of 7,300 ppb and 4,700 ppb, respectively. Moderate levels of toluene,
<br /> ethylbenzene and xylenes were also present. TPHg and benzene were detected in the sample from
<br /> well MW9R at concentrations of 9,900 ppb and 3,300 ppb, respectively. Moderate levels of
<br /> toluene, ethylbenzene and xylenes were also present. TPHg and benzene were detected in the
<br /> sample from well MW 13 at concentrations of 1,100 ppb and 150 ppb, respectively. Low levels of
<br /> toluene, ethylbenzene and xylenes were also present. TPHg and benzene were detected in the
<br /> sample from well VEW 1-D at concentrations of 20,000 ppb and 2,500 ppb,respectively. Moderate
<br /> to high levels of toluene, ethylbenzene and total xylenes were also present. TPHd was detected in
<br /> wells MW6R, MW8, MW9R and VEW1-D at concentrations of 1,400 ppb, 4,000 ppb, 2,000 ppb
<br /> and 310,000 ppb, respectively.
<br /> MTBE was reported in well MW6R at a concentration of 2,500 ppb, in well MW7 at a
<br /> concentration of 5.2 ppb, in well MW8 at a concentration of 9,700 ppb, in well MW9R at a
<br /> concentration of 11,000 ppb, in well MW 13 at 85 ppb and in well VEW 1-D at a concentration of
<br /> 7,900 ppb. TBA was reported in well MW6R at a concentration of 630 ppb, in well MW8 at a
<br /> concentration of 4,800 ppb, in well MW9R at a concentration of 3,700 ppb and in well VEW1-D
<br /> at a concentration of 4,900 ppb. No other gasoline oxygenates or additives were detected in any
<br /> site well.
<br /> March 2019 analytical results are presented in Table 2. Cumulative analytical data for petroleum
<br /> hydrocarbons are summarized in Table 10. Cumulative oxygenate analytical results are
<br /> summarized in Table 11. Laboratory data sheets and chain-of-custody documentation are included
<br /> in Attachment B. TPHg, TPHd, benzene and MTBE isoconcentration maps are presented as
<br /> Figures 5, 6, 7 and 8, respectively.
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