ARCHIVED REPORTS_XR0003198 - Laserfiche WebLink

Home Browse Search

' The destruction efficiencies for July 26, August 31, and October 7, 2005 were also calculated using PID readings which resulted in 95 45 percent, 96 28 percent, and 95 37 percent, respectively Destruction efficiency calculations are provided in Table 7 ' Since the destruction efficient calculations for most of the analytes using laboratory data were below 99% Y Yt g ►y ATC also calculated the total mass of TPHg and BTEX during the reporting period to show compliance ' with the site San Joaquin Valley Air Pollution Control District(APCD)permit The total mass released was calculated using the average effluent stream concentrations and influent flow rate which resulted in a total mass of 5 23 pounds emitted by the SVE system from July 1 to October 7,2005 into ambient air This value is below the allowable 2 3 pounds per day of VOC's stated in the APCD permit Emissions calculations are provided in Table 8 Water Treatment System Evaluation From June 29 to October 7, 2005, the average groundwater extraction rate from the vapor extraction ' system knockout tank was approximately 35 07 gallons per hour of operation and the total groundwater discharged to the City of Stockton sewer system was approximately 50,348 gallons ' Approximately 50,348 gallons of groundwater were extracted from VWI, VW2, and MW1 and the average influent concentrations of TPHg, benzene, toluene, ethylbenzene, and total xylenes from June 29 to October 7, 2005, were below the stated laboratory method detection limits of 50 ug/l, 0 5 ug/l, 0 5 ug/l, ' 0 5 ug/l, and 1 0 ug/l, respectively The petroleum hydrocarbons in the extracted groundwater appear to be volatilizing and are being remediated by the thermal oxidizer and absorbed by the in series carbon vessels located within the remediation compound Calculations for the masses of TPHg, benzene, toluene, ethylbenzene, xylenes, and MTBE removed during the third quarter 2005 reporting period are provided in Table 9 Total TPHg removed via groundwater treatment and discharge since system startup on December 19,2002 10 11 pounds of TPHg as of end of second quarter 2005 + 0 02 pounds of TPHg during the third ' quarter 2005 = 10 13 pounds of TPHg removed since the startup of the system Based on the low concentrations of the remaining target analytes detected from the influent sample port, the total mass BTEX treated and removed from the groundwater treatment system were calculated but not included in the cumulative removal volumes These values were calculated for each analyte for the current quarter, however, a cumulative total has not historically been calculated for each analyte since remediation ' began at the site Air Sparge System Evaluation ' From June 29 to October 7, 2005, the air sparge system operated continuously The average air injection rate from June 29 to October 7, 2005 was approximately 15 84 SCFM and the average influent pressure was ' approximately 3 8 pounds per square inch(PSI) s lenviro1625961quart1yl3gr-2005 doc ATC ASSOCIATES INC