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ppmv, 1,133 to 3,546 ppmv, 748 to 1,302 ppmv, and 1,425 to 2,246 ppmv, respectively Field
<br />observations for this portion of the ASFT were recorded and are summarized as Table 8
<br />During the ASFT on AS-1, DO concentrations were observed to increase at observation points MW-9,
<br />MW-10, MW-11, MW-12, MW-13, and EX-1 from 0 22 to 0 36 mg/L, 0 60 to 0 98 mg/L, 1 96 to 2 51
<br />mg/L, 0 20 to 0 29 mg/L, and 0 50 to 0 76 mg/L, and 159 to 1 70 mg/L, respectively Groundwater
<br />' elevations measured in observation wells MW-9, MW-10, MW-11, MW-12, MW-13, and EX-1, increased
<br />0 10 feet, 0 24 feet, 0 31 feet, 0 20 feet, 0 10 feet, and 0 12 feet, respectively VOC concentrations
<br />' measured at observation points MW-9, MW-10, MW-11, MW-12, MW-13, EX-1, VE-1, VE-2, and VE-3,
<br />ranged from 2,276 to 4,020 ppmv, 1,710 to 2,275 ppmv, 2,910 to 3,340 ppmv, 3,057 to 3,830 ppmv, 2,665
<br />to 2,960 ppmv, 3,663 to 4,237 ppmv, 3,747 to 4,175 ppmv, 1,350 to 1,520 ppmv, and 2,770 to 4,426
<br />ppmv, respectively Field observations for this portion of the ASFT were recorded and are summarized as
<br />Table 8 _
<br />' 7.3 Air Sparge Feasibility Study Discussion and Conclusions
<br />Air sparge wells AS-2 and AS-3 each operated for approximately 3 hours with almost an immediate
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<br />breakthrough Significant DO concentration changes (i e, DO changes greater than 50% of the initial
<br />baseline measurement) were observed to occur at observation points MW-9, MW-10, MW-11, MW-12,
<br />and MW-13 during the ASFT for AS-2, at MW-9 and MW-13 during the ASFT for AS-3, and at MW-9,
<br />MW-10, and MW-13 during the ASFT for AS-I Groundwater elevation increases were observed in
<br />' monitoring wells MW-9, MW-10, MW-11, MW-12, and EX-1 when AS-2 was pressurized, in monitonng
<br />wells MW-9, MW-11, MW-12, and EX-1 when AS-3 was pressurized, and in monitoring wells MW-9,
<br />MW_10, MW-11, MW-12, MW-13, and EX-1 when AS-1 was pressurized Significant VOC
<br />iconcentration changes (i e , VOC changes greater than 20% of the initial baseline measurement) were
<br />observed to occur at monitoring points VE-1, VE-2, VE-3, MW-9, MW_ 10, MW-11, MW-12, MW-13,
<br />' and EX-1 during the ASFT for AS-2, at monitonng points VE-1, VE-2, VE-3, MW-9, MW-10, MW-11,
<br />MW-12, MW-13, and EX-1 during the ASFT for AS-3, and at monitoring points VE-3, MW-9, MW-10,
<br />and MW-12 during the ASFT for AS-1
<br />' The data collected from the ASFT indicates that air sparging may be an appropnate remedial action for
<br />this site Based on DO readings, groundwater elevation changes, and measured VOC concentration
<br />' changes observed during the ASFT, an air sparge radius of influence of at least approximately 59 feet can
<br />be established for the site The induced DO concentration changes, groundwater elevation changes and
<br />' VOC concentration changes at monitoring points MW-9, MW-10, MW-11, MW-12, EX-1, VE-1, VE-2,
<br />and VE-3 most notably illustrates the on-site air sparging responses
<br />EZ 100966 CAP
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<br />ATC Associates Tnc
<br />ATC Project No 43 25827 0026
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