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TRC Alton Geoscience, Inc. <br /> i <br /> Dual-Phase Extraction Report Summary Sheet r <br /> June 2002 <br /> Hammer 1-5 Arco Station <br /> 3250 West Hammer(ane 4 <br /> Stockton, California <br /> I <br /> VAPOR EXTRACTION PERFORMANCE Date of f[rs[TRC Alton Geoscience event at this site: 06/10/02 <br /> Date of this event: 6/10-15102 <br /> Technology used: Mobile Dual-Phase Extraction Maximum system influent concentration(ppmv): S60 <br /> (Thermal Oxidizer) Minimum system influent concentration(ppmv): " , 100 j <br /> Maximum system flow(scfm): .75 <br /> Number of vapor extraction wells open: i Minimum system flow(scfm): 10 <br /> Operating Days this month: 5.0 Maximum system vacuum(in.of Hg): 26.0 { <br /> Total Operating Days: 5.0 Minimum system vacuum(in.of Hg): 21,0 <br /> Mass of hydrocarbons(HC)removed by vapor this period(lbs.): 23 <br /> Operating Mode: Thermal Equivalent gallons of-HC removed by vapor this period: 3.7 <br /> s <br /> WELL EXTRACTION DETAIL r 1,," <br /> Max_ Min. Range of Time on <br /> Cone. Cone. Flow each well <br /> Well# (ppmv) (ppmv) (scfm) (days) <br /> MW-1 560 100 75-10 5.0 day <br /> GROUNDWATER RECOVERY �� 1 <br /> Date Recovery Method Recovery Volume of Groundwater(gallons) I <br /> 6110-15102* Dual-Phase Extraction , 19,700 s� <br /> i <br /> I <br /> ADDITIONAL,INFORMATION: <br /> i <br /> i <br /> 'Approximately 19,700 gallons of groundwater was extracted during this event. The removal of this water from the site was coordinated by <br /> Shaw Environmental and Infrastructure,Inc, �. <br /> HC concentrations were measured using field instruments calibrated as Hexane with a maximum range of 10,000 ppmv, They are used <br /> to show trends. Vapor samples analyzed by laboratories have shown variances both above and below the field data in the past. <br /> HC recovery(lbs.) = (A time(hours))x(60 minutes/hour)x(avg. flow(scfm))x(avg,concentration(ppmv)/I, <br /> 000,ODO)x($b lbs. /(379 ft 3)) <br /> HC recovery(gal.) = (HC recovery(lbs.))x(I gal./6.2475 lb.) <br /> scfm = standard cubic feet per minute lbs. = pounds <br /> t <br /> ppmv = parts per million by volume in Hexane A = delta change from the previous reading to the reading on the current line. i <br /> Max. = Maximum avg = average of the current reading and the previous reading i <br /> Cane. = Concentration gal. = gallons <br /> in. of Hg = inches of mercury a i <br /> Prepared by: -- � Thomas A Greene TRC Alton Project No: 251027 <br /> MTS Project Engineer <br /> Approved by abriel Ferramola <br /> Y <br /> MTS Project Engineer <br /> • n <br />