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r „ r t A S S O C I A T E S I N C chain of custody forms are presented in Appendix D The Rhodamine WT dye data is presented in Table 9 6.3 Air Sparge Pilot Test Results —Radius of Influence Evaluation Well ASI was used to evaluate the site specific radius of influence associated with DDC application This was performed using rhodamine WT dye as a tracer and evaluating the rhodamine WT analytical results of groundwater samples collected during test period The dye ' analytical results are summarized in Table 9 ' The Rhodamine WT dye analytical data shown on Table 9 suggest that Rhodamine WT dye was not present before the pilot test, however, after initiation of the system, the dye was detected in all piezometers for at least one monitoring event As anticipated, the dye concentrations dropped ' over time Based on the collected dye data, the overall estimated ROI for AS 1 is approximately 20 feet Ntv 6.4 Air Sparge Pilot Test Results --Dissolved Phase Petroleum Hydrocarbons A series of graphs were prepared to evaluate dissolved phase petroleum hydrocarbon concentrations during the pilot test These graphs are presented as Figures 8 through 14 AS1,ASI(s) and ASI(d) ' Figures S, 9, and 10 present petroleum hydrocarbon groundwater data versus time for the air ' sparge well AS 1 and piezometer AS 1(s) and AS 1(d), respectively The data for dissolved phase petroleum hydrocarbon concentrations versus time show elevated benzene and TPHg concentrations prior to startup of the pilot system Following startup, the December 11, December 17, and December 27, 2001 and January 3, 2002 samples contained significantly lower TPHg and benzene concentrations, indicating dissolved phase removal as well as groundwater circulation through the DDC well casing The ASI, AS 1(s) and AS 1(d) dissolved phase data for TPHg and benzene followed the expected trend of concentration reduction over time MR(s) The PZ 1 a(s) data for dissolved phase TPHg and benzene (Figure 11) show initially increasing ' concentrations followed by decreasing concentrations This trend within the area of groundwater circulation around ASI was expected, demonstrating an increase in initial concentration caused by the mass transfer from adsorbed phase to dissolved phase, followed by dissolved phase mass ' removal The mass transfer from adsorbed to dissolved phase is caused by the circulation of treated groundwater through significantly impacted soil, the cleaned groundwater picks up petroleum w 1163931reportslr&s doe 13