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analvte Revmoved Durtng the laoar Extramon TeSr(Ibsrhr) (Eters anaivte -,"" 54 min 28 22 liters air mole analyte X R grrt 1 Ib 10-liters air X min x tir x 1 ft' x 24 5 liters vapor mole analyte x 454 gm The following table summarized the dates by which the vapor extraction system operated the ' total hours operated. and the calculated mass removed during the dates by which the vapor extraction system operated for both Events 1 and 42 Nass calculations associated with the remediation events are provided to more detail in Table 6 Summary of Plass Removers ' VET System Dates Total TPHg Benzene MTBE Hours removed removed removed lbs lbs Ibs Extraction Event#1 (10104-April 2005) ' 10/25/04-10/29104 40 D 18625 313 0 002 11/29/04-02/03/04 360 4949 066 0 005 0/103/05-01/07/05 3375 - 654 00,10 ' 02/07/05 -02/11/05 370 9472 040 0 003 03/14/05-03/18/05 400 2980 030 0 002 04/11/05-04/15/05 400 6459 031 0 004 Event#1 Subtotal 22675 42435 1135 0 025 ' Extraction Event#2 (6105- 10105) 06/27/05- 7101105 375 105 009 00004 09/12/05-09/16/05 39D 5323 031 00000 10/24/05- 10/28105 425 12598 030 00000 Event#2 Subtotal 1190 19016 071 0 0004 Cumulative 34575 61501 12 06 00254 5.0 DISCUSSION ' Based upon monitoring of the influent vapor with a PID during the vapor extraction events and analytical results of vapor samples collected from well NIW2 approximately 192 pounds of petroleum hydrocarbon constituents (BTEX. NfTBE, TPHg) were removed during the vapor extraction test conducted during the June — October 2005 event (Event:42) Extraction Event Test 42 averaged a removal rate of approximately 1 61 pounds per hour By comparison Event Test 41 yielded an observed mass reduction rate of 1 92 pounds per hour A reduction in the mass removal rate has been observed since the test was initiated in October 2004 s'enviromenta1\62577— Diesel Perflreportslinter im_=42 doi.