ARCHIVED REPORTS XR0002729 - Laserfiche WebLink

Home Browse Search

X�f TI ' S E C O R ,� tl 3 1x 7 1 l� ATTACHMENT A REMEDIAL SYSTEM PERFORMANCE EVALUATION � 1� ' A dual phase extraction (DPE) system, consisting of the application of combined soil vapor extraction (SVE) and groundwater extraction (GWE) technologies, was Initiated at the site on June 14, 2003 A brief description and a performance evaluation of the DPE system during the second quarter 2005 are presented below Certified laboratory analytical reports, chain-of-custody documentation, and field h. data sheets are included as Attachment A-A yds Soil Vapor Extraction N 1 � SVE was started on June 14, 2003 The SVE portion of the DPE system is comprised of 6 SVE wells d (SVE-1, SVE-2, MW-1, MW-2, MW-4, and EW-7) and a Thermtech VAC 50 thermal/catalytic oxidizer ' (Cat-Ox) as the abatement device The SVE system operates under San Joaquin Valley Air Pollution :y- Control District Permit to Operate N4826-1-0 r The SVE system was approximately 66% operational this quarter Approximately 53 pounds (lbs) of TPHg, 0 5 Ib of benzene, and 1 Ib of MtBE were removed this quarter An estimated 24,111 lbs of TPHg., 104 lbs of benzerie, and1.872 lbs of MtBE have been removed sine remediation was Initiated , at the site 4 ' SVE system performance data, including hours of operation, applied vacuum, flow rate, ambient dilution status, flame Ionization detector (FID) field measurements, influent TPHg and benzene concentrations, and estimated mass removal data are presented in Table A-1 Soil vapor emissions 3 ' data is provided In Table A-2 Graphic illustrations of soil vapor TPHg and benzene mass removal and concentration data are shown on Figures A-1 and A-2 l Groundwater Extraction System 4� The GWE portion of the DPE system is comprised of submersible pumps Installed In wells EW-1 and EW-6 and "slurp" tubes installed in wells MW-4 and EW-7, which are connected to an air stripper and ' three 2,000 Ib-granular activated carbon vessels Extracted groundwater is treated prior to discharge to a City of Stockton sanitary sewer line During the second quarter 2005, the GWE system pumped and treated approximately 145,000 gallons of groundwater, removing approximately 0 5 lbs of TPHg, 0 0 lbs of benzene, and 0 3 lbs of MtBE An n estimated 112 8 lbs of TPHg, 4 04 lbs of benzene and 139 9 lbs of MtBE have been removed by GWE since the DPE system began operating at the site WE system performance data Is included In Table A-3 Groundwater treatment effluent data Is included in Table A-4 Graphic Illustrations of TPHg and benzene mass removal from extracted ' groundwater and groundwater concentration data are shown on Figures A-3 and A-4 l r c y f IBP-ARC0149321QMRs1200512QMR05 doc ! r 1