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' I I In,I# QYi 50 131-10, Ill\11011111(ili It Ri nu cIi i1 Fe,istbdil` I,,i Rep)i i I CbI It 111 2 , 1200, ' concentrations of approximately 4%, 3 5%, and 2%, respectively This response was likely due to the infection of sparge air The remaining three monitonng point wells (MW-1C, MW-2C, MW-9B) did not ' display significant variation of dissolved oxygen concentrations tLaboratory analysis of groundwater samples collected from monitor well MW-3B before and after the AS test indicated a significant change in dissolved hydrocarbon concentrations Analytical results ' indicated that volatile fuel hydrocarbon concentrations in MW-3B increased from 640,000 micrograms per liter (ug/1) prior to AS testing, to 12,000,000 ug/1 immediately following the conclusion of AS testing The increase in volatile fuel hydrocarbons may be attributed to adsorbed hydrocarbons being mobilized into groundwater Additionally,BTEX concentrations in groundwater collected from MW-3B ' decreased following AS testing The decrease in BTEX concentrations may be attnbuted to the air stripping (converting to vapor phase) as a direct result of the AS remediation The groundwater samples ' collected from MW-3C did not display any significant variation of dissolved-phase hydrocarbon concentrations before and after the AS test Laboratory analytical results of groundwater samples • collected for the AS test are presented in Table 5 A copy of the laboratory analytical report is provided in Appendix F ' 4 1 4 Air Sparge Test Results ' Based on AS testing data, groundwater analytical results, and field observations, the effective AS ROI (intuitive estimation between induced pressure response and dissolved oxygen increases versus distance ' in the monitoring point wells) approaches an estimated 20 foot radial distance from test well ASW-1 The ASW-1 test data was plotted on a well performance curve (pressure versus flow rate) and is presented as Figure 3 The estimated AS ROI for the site is presented in Figure 4 Based on the AS test tresults, a remedial system incorporating groundwater AS would likely be an effective treatment technology for the remediation of groundwater beneath the site 4 2 VAPOR EXTRACTION TESTING ' VE testing was conducted at the site on November 19, 2002 in order to determine the feasibility of utilizing VE to remediate petroleum hydrocarbon impacted soil beneath the site The VE test equipment was transported to the site and initially manifolded to remedial well VEW-1 and subsequently to ' 10