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Destruction Efficiency
<br /> For the reporting date of April 8, 2005, the destruction efficiency for TPHg,benzene,toluene, ethylbenzene,
<br /> ' and xylenes were calculated to be approximately 97 31 percent, 90 00 percent, 92 60 percent, 96 50 percent,
<br /> and 73 53 percent, respecxtively For the reporting date of June 29, 2005, the destruction efficiency for
<br /> TPHg,benzene, toluene, ethylbenzene, and xylenes were calculated to be approximately 0 00 percent, 58 33
<br /> ' percent, 46 81 percent, 15 25 percent, and 76 54 percent, respecxtively The destruction efficiencies for
<br /> April 8, May 12, and June 29, 2005 were calculated using PID readings which resulted in 95 14 percent,
<br /> 96 55 percent, and 99 67 percent, respectively Destruction efficiency was not calculated for May 12, 2005,
<br /> ' since the influent sample was nondctect for TPHg and BTEX Destruction efficiency calculations are
<br /> provided in Table 7
<br /> Since the destruction efficiencies for the analytes were below 99%, ATC calculated the total mass of TPHg
<br /> and BTEX during the reporting period to show compliance with the San Joaquin Valley Air Pollution
<br /> Control District (APCD) permit assigned to the SVE system The total mass removed was calculated using
<br /> the average effluent stream concentrations and influent flow rate which resulted in a total mass of 1 10
<br /> pounds emitted by the SVE system from April 7 to June 29, 2005 into ambient air This value is below the
<br /> allowable 2 3 pounds per day of VOC's stated in the APCD permit Emnissions calculations are provided
<br /> in Table 8
<br /> Water Treatment System Evaluation
<br /> From April 7 to June 29, 2005, the average groundwater extraction rate from the vapor extraction system
<br /> knockout tank was approximately 140 gallons per hour of operation and the total groundwater discharged
<br /> to the City of Stockton sewer system was approximately 87,023 gallons
<br /> Approximately 87,023 gallons of groundwater were extracted from VW1,VW2, VW4, and MW1 and the
<br /> ' average influent concentrations of TPHg, benzene, toluene, ethylbenzene, and total xylenes between
<br /> April 7 and June 29, 2005, were approximately 180 ug/l, 3 38 ug/l, 3 38 ug/l, 6 13 ug/l, and 31 lug/l,
<br /> respectively The petroleum hydrocarbons in the extracted groundwater appear to be volatilizing and are
<br /> being remediated by the thermal oxidizer Based on the low concentrations of TPHg and BTEX
<br /> ' concentrations detected in the groundwater samples collected from the influent sample port, the total
<br /> mass of TPHg and BTEX treated and removed from the system was not calculated
<br /> ' Total TPHg removed via groundwater treatment and discharge since system startup on December 19,2002
<br /> 9 98 pounds of TPHg as of end of first quarter 2005 + 0 13 pounds of TPHg second quarter 2005 =
<br /> ' 10 11 pounds of TPHg removed since the startup of the system
<br /> Additionally, the groundwater treatment and discharge system removed approximately 0 02 pounds of total
<br /> ' xylenes during the second quarter 2005 These values were calculated for the current quarter, but a
<br /> cumulative total since remediation began at the site has not historically been calculated Total BTEX
<br /> removed via groundwater treatment and discharge prior to the second quarter 2005 reporting period was
<br /> reported to be approximately 164 pounds since system startup on December 19, 2002 Calculations for the
<br /> ' masses of TPHg, benzene, toluene, ethylbenzene, xylenes, and MTBE removed for the second quarter 2005
<br /> reporting period are provided in Table 9
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