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maximum vacuum would be applied to VE -1, VE -2, and VE -3 for target durations of approximately 10 -
<br />hours each The source wellhead vacuum, source well flow rate, source well VOC concentration, and the
<br />induced wellhead vacuums were periodically measured and recorded throughout the VEFT In addition,
<br />' soil vapor samples were collected in TedlarTM bags for laboratory analysis for TPHg, BTEX, and MTBE
<br />using Modified EPA Test Method 8260B, at the start, mid -points, and end of each test on each well
<br />' The VEFT utilized VE -1, VE -2 and VE -3 as source wells and various vapor extraction wells and
<br />groundwater wells were used as observation wells The construction of vapor extraction wells and
<br />' groundwater monitor wells are summarized in Table 2 The locations and identifications of the vapor
<br />extraction wells are depicted in Figure 4
<br />6 2 Vapor Extraction Pilot Testing Results
<br />The maximum applied vacuum of source well VE -1 was approximately 128 mwc The observed VE -1
<br />source well flow ranged from 38 to 131 actual cubic feet per minute (acfm) Field screening
<br />' concentrations of VOCs from VE -1 extracted source soil vapor ranged from 1,500 parts per million by
<br />volume (ppmv) to 6,000 ppmv Analytical results of the soil vapor samples collected yielded maximum
<br />and MTRF results of 7,360 pninv, 47 ppmv, 1,200 ppirn, 180 ppmv, -0 liprnv, , and -4-4
<br />' ppmv, respectively Monitoring points MW -9, MW -10, MW -11, MW -12, MW -14, MW -17, VE -2, and
<br />VE -3 had measured induced wellhead vacuums ranging from 0 17 to 0 73 mwc, 0 17 to 0 73 inwc, 0 41 to
<br />1 7 mwc, 0 26 to 1 3 inwc, 0 05 to 0 33 inwc, 0 03 to 0 22 mwc , 0 19 to 0 84 inwc, and 0 31 to 1 4 mwc,
<br />respectively No induced vacuum responses were observed at well MW -13 The source wellhead
<br />' vacuum, source well flow rate, source well VOC concentration, and the induced wellhead vacuums are
<br />summarized as Table 6, Soil Vapor Extraction Feasibility Test Table 7, Vapor Sample Analytical
<br />Results, summarizes the soil vapor analytical data collected during VEFT, copies of the original
<br />laboratory report and chain -of -custody documentation are presented in Appendix D
<br />The maximum applied vacuum at source well VE -2 was approximately 120 inwc Source well flow was
<br />measured ranging from approximately 44 to greater than 131 acfm Source well VOC concentrations field
<br />screened with a PID ranged from 3,800 ppmv to 5,300 ppmv Maximum TPHg, BTEX, and MTBE
<br />analytical results were reported at 10,000 ppmv, 140 ppmv , 1,300 ppmv , 200 ppmv, 1,000 ppmv, and 18
<br />ppmv, respectively Monitoring points MW -9, MW -10, MW -11, MW -12, MW -14, MW -17, VE -1, and VE -
<br />3 had measured induced wellhead vacuums ranging from 0 44 to 1 60 mwc, 1 1 to 6 0 inwc, 0 18 to 0 76
<br />inwc, 0 21 to 0 91 mwc, 0 50 to 18 mwc, 0 15 to 0 93 mwc , 0 22 to 0 98 mwc , and 0 63 to 2 2 mwc,
<br />respectively No induced vacuum responses were observed at well MW -13 Field observations were
<br />recorded and are summarized as Table 6 Table 7 sui manzes the soil vapor analytical data collected during
<br />this phase of the VEFT
<br />The maximum applied vacuum at source well VE -3 was approximately 84 inwc Source well flow ranged
<br />from approximately 85 to 92 acfin Source well VOC concentrations field screened with a FID ranged
<br />from 1,300 ppmv to 4,000 ppmv Maximum TPHg, BTEX, and MTBE analytical results were reported at
<br />EZ 100966 CAP
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<br />ATC Project No 43 25827 0026
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