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Page 1 of 1 <br /> Harlin Knoll [EH] <br /> From: Bill Cook[bcook@condorearth.com] <br /> Sent: Tuesday, June 05, 2012 4:08 PM <br /> To: Harlin Knoll [EH] <br /> Subject: SJC Public Works Interim Remediation update <br /> We started the system on April 23, 2012 and slowly ramped it up to avoid overwhelming the catalytic oxidizer. <br /> Influent concentrations were generally lower than we expected from the pilot test data. Concentrations and the <br /> extraction rate increased as we gradually increased vacuum pressure. We had lower concentrations at the <br /> systems maximum vacuum and began to pull water from MW-1. We are currently operating at a moderate <br /> vacuum to avoid lifting the water column and drowning the MW-1 well screen. Oddly the equipment is close to <br /> maximum temperature at its current setting,which would otherwise indicate that influent concentrations are near <br /> 2000 to 3000 ppmv. But our laboratory data indicates that concentrations are much lower. We recorded our <br /> highest PID concentration reading to date, this morning, 1418 ppmv. <br /> We will include a more detailed status update with the 2Q12 monitoring report. <br /> Date Influent PID Influent Laboratory Extraction Rate Total Extracted <br /> Reading Concentration TPH- TPH-G TPH-G (until next <br /> G sampling date <br /> 4/23/12 210 ppmv 49.4 ppmv 0.01lbs/hr <br /> 2.19 lbs <br /> 5/3/12 615 231 0.07 <br /> 2.19 <br /> 5/22/12 600 394 1.09 <br /> 290.78 <br /> 6/5/12 1418 <br /> Total to date 321.95 <br /> \ 6/6/2012 <br />