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v a <br /> A S S O C I A T E S I N C <br /> sample identification, placed on ice, and shipped under chain-of-custody to Argon Laboratories <br /> Field development/purge logs are presented in Attachment 1 <br /> Laboratory Analysis <br /> The groundwater sample from well MW1 was analyzed by Sequoia Analytical for total petroleum <br /> hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX), by EPA <br /> Method 801518020, and oxygenates fuel additives by EPA method 8260 <br /> Laboratory Results <br /> Low concentrations of TPHg and BTEX constituents were detected in the groundwater sample <br /> collected from MW1 Only benzene, reported at 2 3 parts per billion, exceeded its maximum <br /> contanunant level Fuel oxygenate additives including MTBE were not detected in the <br /> groundwater sample collected from MW 1 <br /> Analytical results are summarized in Table 2 Laboratory data sheets and chain-of-custody <br /> documentation are provided in Attachment 2 <br /> Mass Balance Calculations <br /> Using the analytical results from the subsurface investigations presented in Table 3, ATC <br /> estimated the lateral extent of TPHg and benzene concentrations in the unsaturated zone beneath <br /> the site as depicted on Figures 3 and 4, respectively The isoconcentration shown on Figure 3 <br /> was then used by ATC to perform mass balance calculations to estimate the mass of TPHg <br /> impacted soil The total mass of TPHg originally present in the soil is estimated to be <br /> approximately 96 kilograms The isoconcentration shown on Figure 4 was used by ATC to <br /> perform mass balance calculations to estimate the mass of benzene impacted soil The total mass <br /> of benzene remaining in the soil is estimated to be less than one hundredth of a kilogram Mass <br /> balance calculations are included in Attachment 3 <br /> Using the analytical results from the subsurface investigations presented in Table 3, ATC <br /> estimated the lateral extent of TPHg and benzene concentrations in groundwater beneath the site <br /> as depicted on Figures 5 and 6, respectively The isoconcentration shown on Figure 5 was then <br /> used by ATC to perform mass balance calculations to estimate the mass of TPHg impacted <br /> groundwater The isoconcentration shown on Figure 6 was used by ATC to perform mass balance <br /> calculations to estimate the mass of benzene impacted groundwater The total mass of TPHg and <br /> benzene remaining in the soil is estimated to be less than one hundredth of a kilogram Mass <br /> balance calculations are included in Attachment 3 <br /> w Ni7292 000Nrports\2 qmr 2002 aoc 2 <br />