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• 1, AS -2, and AS -3 for target durations of approximately 2 5 hours each
<br />The ASFT conducted on December 17, 2002 utilized AS -1, AS -2, and AS -3 as sparge points Vapor
<br />extraction and monitor wells VE -1, VE -2, VE -3, MW -9, MW -10, MW -11, MW -12, MW -13, and EX -1
<br />' were used as monitoring points during the ASFT
<br />7.2 Air Sparge Pilot Testing Results
<br />Beginning at 06 20, AS -2 was the first air sparge point used for the ASFT AS -2 was pressurized from
<br />20 1 to 16 pounds per square inch gage (psig) for approximately 3 0 hours Initial breakthrough, the
<br />' pressure required to displace the water column within the sparge well, was observed after only a few
<br />minutes at 20 1 psig The initial corresponding flow rate was measured to be 1 8 scfm The flow rate
<br />' increased steadily throughout the test of AS -2, from 1 8 to 17 4 scfm After 3 hours, the test of AS -2 was
<br />concluded, and AS -3 was pressurized from 23 to 18 psig for a duration of approximately 3 0 -hours Initial
<br />breakthrough was achieved almost inimediately at 23 psig The flow rate increased steadily throughout
<br />the test from 15 to greater than 20 scfm After approximately 3 -hours, the test of AS -3 was concluded,
<br />and AS -1 was pressurized from 20 to 15 psig for a total duration of approximately 2 5 -hours Initial
<br />' i rouf�h "� aciii¢' oat alrnoE ,L tmly r l at 21) ps-,-, The %3% ate i-it-reaµec' Qv o-' rl'r
<br />test from 7 to greater than 20 scfm
<br />During the ASFT on AS -2, DO concentrations were observed to increase at observation points 1AW-9,
<br />MW -10, MW -11, MW -12, and MW -13, from 0 18 to 0 41 milligrams per liter (mg/L), 0 22 to 1 56 mg/L,
<br />0 15 to 0 22 mg/L, 0 14 to 0 23 mg/L, and 0 16 to 0 40 mg/L, respectively DO concentrations were
<br />' observed to decrease at observation point EX -1 from 2 50 to 2 10 mg/L Groundwater elevations
<br />measured in observation wells MW -9, MW -10, MW -11, MW -12, and EX -1, increased 0 15 feet, 0 24 feet,
<br />' 0 21 feet, 0 15 feet, and 0 32 feet, respectively No significant changes in groundwater elevation (i e ,
<br />changes greater than 0 05 feet) were observed at observation well MW -13 VOC concentrations measured
<br />at observation points MW -9, MW -10, MW -11, MW -12, MW -13, EX -1, VE -1, VE -2, and VE -3, ranged
<br />from 11 to 1,437 ppmv, 90 to 1,126 ppmv, 4 6 to 555 ppmv, 151 to 1,637 ppmv, 50 2 to 627 ppmv, 10 2 to
<br />937 ppmv, 45 4 to 833 ppmv, 248 to 568 ppmv, and 716 to 1,672 ppmv, respectively Field observations
<br />' for this portion of the ASFT were recorded and are summarized as Table 8, Air Sparge Feasibility Test
<br />During the ASFT on AS -3, DO concentrations were observed to increase at observation points MW -9,
<br />MW -11, MW -12, MW -13, and EX -1 from 0 22 to 0 33 mg/L, 0 19 to 0 22 mg/L, 0 18 to 0 23 mg/L, 0 27
<br />' to 0 45 mg/L, and 1 79 to 197 mg/L, respectively DO concentrations were observed to decrease at
<br />observation point MW -10 from 0 88 to 0 71 mg/L Groundwater elevations measured in observation
<br />' wells MW -9, MW -11, MW -12, and EX -1, increased 0 09 feet, 0 18 feet, 0 11 feet, and 0 07 feet,
<br />respectively No significant changes in groundwater elevation (i e, changes greater than 0 05 feet) were
<br />observed at observation wells MW -10 and MW -13 VOC concentrations measured at observation points
<br />' MW -9, MW -10, MW -11, MW -12, MW -13, EX -1, VE -1, VE -2, and VE -3, ranged from 1,257 to 2,882
<br />ppmv, 1,094 to 1,328 ppmv, 710 to 2,732 ppmv, 1,725 to 3,268 ppmv, 713 to 2,667 ppmv, 1,115 to 3,675
<br />ATC Associates Inc
<br />EZ 100966 CAP ATC Project No 43 25827 0026
<br />S 1EZ Servc\EZ 1009661Reports1100966CAP
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