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' C7eala gkal reels a!uG Page 10 <br /> Dual Phase Extraction Pilot Test Report <br /> Project No 723 2 <br /> November 12,2004 <br /> i <br /> if <br /> i fir'° '.y r ' — �'d...s ,'C."Y ,u ,�`" ,� u ,. �� c "_•- ,� .� �y4, ✓.¢ k <br /> _'k w !•«f �, ,z "�'' a s, a,yr <br /> 64 & <br /> ak <br /> a <br /> tai 1 !'cony{ ` R T ti r t GI r < ,. ' , ''r-`s • " � r ' Lrq <br /> T MW-9 GP-1 T GP-2 T GP-3 <br /> These relatively close distances were chosen because we anticipated a small radius of <br /> influence for the site since it is predominantly clay soils The wells were placed linearly <br /> along the dominant groundwater direction that is to the northwest As stated in section 5 1 <br /> the influence in GP-1 was immediate (3 minutes) as evidenced by the eruption of the Gr" <br /> H2O2/groundwater solution out of the well casing This was probably caused by either of two 'L eA�j a Vii`°` <br /> conditions a soil fracture (probably a result of drilling artifact) between the two well filter r ,hew <br /> packs or a sand/silt layer(s) intercepting the screens of both wells It can be visualized that <br /> the 5 gallons of H2O2 solution slowly exited the MW-9 well casing and filled the filter pack 7L <br /> ' pore space When the oxygen was applied under pressure, the solution then migrated by one <br /> of the above pathways into the filter pack of GP-I The pore space of this filter pack then <br /> filled until the solution ultimately made its way into the casing and then out the top of the <br /> casing <br /> Demonstrating influence in GP-2 and GP-3 is more problematic due to the fluctuating TPH- <br /> ' G concentrations in the wells during the pilot test API's technical report on the ISCO pilot <br /> test (Appendix D) includes data on oxidation-reduction potential (ORP) measurements A <br /> more positive ORP value indicates an oxidizing environment (i e - as a result of injecting <br />