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Air Sparge System Monrtorrng
<br /> On December 27, 2005, the air sparge system was observed to have a cracked"T"Joint Subsequently, the
<br /> ' air sparge system was shut down The fitting was replaced on January 13, 2006 and the air sparge system
<br /> was restarted The air sparge system operated continuously from January 13 to February 3, 2006 The air
<br /> sparge system was shutt off by ATC personnel on February 3, 2006, since the VES was not operating
<br /> ' properly The air sparge system was restarted on March 21,2006
<br /> REMEDIATION SYSTEM EVALUATION
<br /> ' Soil Vapor Extraction System Evaluation
<br /> ' From December 28,2005 to March 23,2006,the vapor extraction system was operational for approximately
<br /> 305 9 hours The SVE system operated for approximately 9 days at 45 cfm from Januaryl 1 to February 3,
<br /> 2006, and for approximately 3 days at 36 cfm from March 21 to March 23, 2006 The vapor extraction
<br /> system did not operate from December 28, 2005 to January 11, 2006 and February 3 to March 21, 2006
<br /> ' The average extracted vapor flow rate was approximately 42 8 cfm and the average influent vacuum
<br /> achieved by the thermal oxidizer was approximately 23 25 inches of mercury, based on the information
<br /> contained on the field monitoring data sheets contained in Attachment 3
<br /> ' Based on the measured influent flow rate of 42 8 cfm, average influent concentration of each analyte in
<br /> ppmv, and using the values supplied by SunStar Labs of 24 5 liters of vapor per mole of analyte and the
<br /> molecular weight of each analyte in grams per mole, ATC calculated the total number of pounds of each
<br /> analyte removed by the SVE system during the first quarter 2006 Calculations associated with the
<br /> removal of the target analytes TPHg Benzene, toluene, ethylbenzene, xylenes, and MTBE are provided
<br /> on Table 6
<br /> Total TPHg removed via vapor extraction since system startup on December 19,2002
<br /> ' 8,736 31 pounds(lbs)of TPHg as of end of fourth quarter 2005 +4 09 lbs of TPHg first quarter 2006=
<br /> 8,740 40 pounds of TPHg removed since the startup of the system
<br /> ' Total benzene removed via vapor extraction since system startup on December 19, 2002
<br /> '
<br /> 2139 lbs benzene removed total as of end of fourth quarter 2005+ 0 08 Ibs benzene first quarter 2006
<br /> =21 47 pounds of benzene removed since the startup of the system
<br /> Additionally, the SVE system removed approximately 0 13 lbs of toluene, 0 19 lbs of ethylbenzene, 1 25 lbs
<br /> ' of total xylenes, and 0 01 pounds of MTBE during the first quarter 2006 These values were calculated for
<br /> the current reporting period, however, a cumulative total since remediation began at the site has not
<br /> historically been calculated
<br /> Destruction Efficiency
<br /> ' The destruction efficiencies for TPHg, benzene, toluene, ethylbenzene, and xylenes using laboratory data
<br /> from January 24, 2006, were calculated to be approximately 98 28 percent, 31 51 percent, 88 89 percent,
<br /> 54 55 percent,and 86 84 percent,respectively
<br /> The destruction efficiencies for TPHg, benzene, toluene, ethylbenzene, and xylenes using laboratory data
<br /> from March 23, 2006, were calculated to be approximately 58 54 percent, 94 85 percent, 81 05 percent,
<br /> ' 96 82 percent,and 95 44 percent, respectively
<br /> s%enviro1625961quart1y\1gr-2006 doc 7 ATC ASSOCIATES INC
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