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d ' , I N v II I 28 April 1998 ; AGE-NC-95-0103 Page 6,of 9 is summarized on Table 4 Sparging'rates were measured at approximately 10 scfm during each monitoring event A minimum pressure of 15 psi was maintained for the air sparging flow rate 35 SOIL VAPOR EXTRACTION The SVE un.t operated at varying rates during the current quarter Extraction flow rates were calculated to range from 150 to 200 scfrri Typically, the operation averaged 150 scfm during the period An-induced vacuum (negative pressure) of approximately 30 to 35 inches of water was measured in the piping between the blower and extraction wells The radius of measurable vacuum at the outlying well-heads was noted to extend 90 feet from VW-1 to MW-3, with a transmitted vacuum force of 0 17 inches of water Additionally, a vacuum force of 35 inches of water was ' extended from VE-1 to ASO-3,which is a dual completion to VE-1,but Is screened 5 feet below the top of ground water' ' TPH-g was detected in the 16 January 1998 sample collected from influe►zt vapor stream at a concentration of 3,000 parts per billion (ppb, reported as micrograms per liter) BTE&X were detected at concentrations as high as 77 ppb (xylene) TPH-g was detected In the 22 January 1998 , ` sample collected fror`n�influent vapor stream a t'concentrations of 1,600 ppb BTE&X were detected at concentrations as high'as 48 ppb(xyl'ene) TPH-g was detected in the l 8 February 1998 sample collected from influent vapor at a concentration , 1,800 ppb BTE&X were detected at concentrations as high as 56 ppb (xylene) TPH-g was`detected ' In the 17 March 1998 sample collected from influent vapors at a concentration 150 ppb BTE&X were detected at concentrations as lugh as 5 1 ppb (xylene)' 1 The vapor►`sample collected` on;3l 'March 1998 from the.mfluent of wells VW-1 and VE-1 , selectively, con1tained,TPH-g at a concentration of 1,000 ppb BTE&X compounds were detected I at concentrations as high as 13 ppb (xylene) k, The analytical results of soil vapor samples are summanzed on Table 5' The laboratory report(MAI ' Lab No 84983 and 84984, 58199 and 85200, 85919 to 85921, 86907 to'86909 and 87647), Quality I I Assurance' and Quality Control (QA/QC) reports and chain-of custody forms are Included in ry i Appendix D,and F ` r r Concentratioris of extracted volatile organic compounds were generallyibelow the analytical results r' +f obtained from the influent stream samples Analytical'data from samples collected prior to entry of r� the catalytic oxidizer and from the efflaent stream collected in January,,1998; indicate a 99 percent i ,� Advanced GeoEnvironmental,Inc