Laserfiche WebLink
Mr Ron Rowe <br /> Page 4 <br /> F <br /> Startup Vapor Sample Analytical Results <br /> The laboratory reports are included in Attachment D and are summarized to Table 4 Based on <br /> the TPPH and benzene concentrations and the effluent volume factor of 1 33 x influent volume, <br /> the destruction efficiency of the VES during the startup test was approximately 99% 1 <br /> VES Full-time Operation <br /> Smce the laboratory results of the vapor samples demonstrated a 99% destruction efficiency, Mr <br /> Bruce Tuter gave a verbal approval for the permit to operate Therefore, Ground Zero started <br /> the VES for full time operation on November 19, 1997 Vapor wells VW2, VW5, and VW6 <br /> were the only vapor wells online during 1997 (vapor well VW3 was brought on line in January <br /> 1998). <br /> Since November 19, 1997, the VES has been monitored on a weekly basis The systems <br /> moiutoring data sheets are included in Attachment C On December 15, 1997, monthly influent <br /> and effluent vapor samples were collected and submitted to Sequoia Analytical The samples <br /> were analyzed for TPPH and BTEX <br /> Vapor Sample Analytical Results <br /> Laboratory reports are included in Attachment D and are summarized in Table 4 Based on the <br /> TPPH concentrations, the destruction efficiency of the vapor extraction system (VES) during the <br /> December sampling was approximately 97% However, the reported benzene concentration in <br /> the effluent sample was greater than in the influent sample <br /> System Evaluation j <br /> The VES has been removing hydrocarbons from vapor wells VW2, VW5, and VW6 from <br /> November 19 through December 29, 1997 at flow rates ranging from 260 to 319 cubic feet per <br /> minute (cfm) <br /> I <br /> Using the initial TPPH concentration of 14,040 ug/f,, the initial mass removal rate was <br /> I <br /> approximately 315 pounds per day. Based on the second TPPH concentration of 1,400 pg/P, <br /> the mass removal rate was approximately 31 5 pounds per day <br /> i <br /> As of December 29, 1997, the system had been in operation for 934 hours Based on the two <br /> measured influent vapor concentrations and assuming a logarithmic decrease, as of December <br /> 29, 1997, approximately 3,800 pounds of hydrocarbon contamination had been removed from + <br /> the soil. Table 5 summarizes the weekly flow and concentration averages as well as the total <br /> hydrocarbon mass removed from the soil <br /> I <br /> I <br />