|
i
<br /> The destruction efficiencies for January 24 and March 23, 2006, were also calculated using PID readings
<br /> which resulted in values of 95 00 percent and 92 95 percent, respectively Destruction efficiency
<br /> ' calculations are provided in Table 7
<br /> Since the destruction efficiency calculations for the analytes using laboratory data were below 99%, ATC
<br /> ' also calculated the total mass of TPHg and BTEX during the reporting period to show compliance with the
<br /> site San Joaquin Valley Air Pollution Control District (APCD) permit The total mass released was
<br /> calculated using the average effluent stream concentrations and Influent flow rate which resulted in a total
<br /> mass of 158 pounds emitted by the SVE system from December 28, 2005 to March 23, 2006, Into ambient
<br /> ' air This value is below the allowable 2 3 pounds per day of VOC's stated in the APCD permit Emissions
<br /> calculations are provided in Table 8
<br /> Water Treatment System Evaluation
<br /> From December 28, 2005 to March 23, 2006, the average groundwater extraction rate from the vapor
<br /> ' extraction system knockout tank was approximately 51 70 gallons per hour of operation and the total
<br /> groundwater discharged to the City of Stockton sewer system was approximately 15,811 2 gallons
<br /> ' Approximately 15,811 2 gallons of groundwater were extracted from VW1, VW2, and MW1 Based on
<br /> laboratory analytical data and the assumption that the stated laboratory method detection limits would be
<br /> used for any analytes not detected below the stated laboratory method detection limits, the average
<br /> ' influent concentrations of TPHg, benzene, toluene, ethylbenzene, and total xylenes from December 28,
<br /> 2005 to March 23, 2006, were calculated to be 90 ug/l, 0 5 ug/l, 0 5 ug/l, 0 5 ug/l, and 8 5 ug/l,
<br /> respectively The petroleum hydrocarbons in the extracted groundwater appear to be volatilizing and are
<br /> being remediated by the thermal oxidizer and absorbed by the in series carbon vessels located within the
<br /> remediation compound
<br /> ' Calculations for the masses of TPHg, benzene, toluene, ethylbenzene, xylenes, and MTBE removed during
<br /> the first quarter 2006 reporting period are provided In Table 9
<br /> ' Total TPHg removed via groundwater treatment and discharge since system startup on December 19,2002
<br /> 10 15 lbs of TPHg as of end of fourth quarter 2005 -+- 0 01 lbs of TPHg during the first quarter 2006 =
<br /> ' 10 16 lbs of TPHg removed since the startup of the system
<br /> Based on the low concentrations of the remaining target analytes detected from the influent sample port,
<br /> the total mass BTEX treated and removed from the groundwater treatment system were calculated but not
<br /> included in the cumulative removal volumes These values were calculated for each analyte for the current
<br /> quarter, however, a cumulative total has not historically been calculated for each analyte since remediation
<br /> began at the site
<br /> Air Sparge System Evaluation
<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 The average air injection rate from
<br /> December 28, 2005 to March 23, 2006, was approximately 15 38 SCFM and the average influent pressure
<br /> was approximately 4 25 pounds per square Inch(PSI)
<br /> s\cav1ro1625961quart1yll qr-2006 doc 8 ATC ASSOCIATES INC
<br /> 1
<br />
|