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CLEARWATER
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<br /> M 7 G P I, N C. "
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<br /> r soil foilhelin situ respira#ion test A other,me'asurement;will be taken;after,the in=
<br /> situ res ir`ation .tesf to..evaluate Potentia 'sinks` of O and CO that,'ma have
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<br /> ..a` influenced the-:-data a `,. •. p n i
<br /> n A`field`flame ionisation detector calibrated.daily willfi,be:izsed to measureJwolatile i
<br /> 'organic concentrations Concentration., of .O2 and CO2 will be '."measured
<br /> electronically;.using a Gastechtor TraceTechtorn", or'equivalenf.' 'The,Trate
<br /> TechtorT'M
<br /> a f will be�:calibrated.to-standard'atmospheric concentrations (20.9% 02 and 0.05% CO2)
<br /> and agairist a 5'%a-standard:` Each' monitoring' point (vapor-'°or .monitoring.well,or
<br /> vapor probe) .w l',,be purged 'of' three well .volumes;of ;air prior.to collecting a
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<br /> reading. ,, urging.will be accomplished using' an Alpha .One�,air sampling,pump,.or
<br /> equivalent 4 ;
<br /> ' The results `:wall 'be evaluated td'determzne the-'extent of oxygen depletion, and
<br /> carbon dioxide , erir chment-'in''contaminated .SoilS"Compared to background
<br /> ' ` concentrafions in, uncontaminated'soilsTat the;:site. Background' concentrations of
<br /> O and=COz are usually >I:5% 02 and` 2' (Marrin et al.,`1991), A concurrent
<br /> r y decrease in`02 and increase,in,CO2 relative to' background'concentrations. often
<br /> indicates.°the'chemical or biological breakdown;`of organic compounds
<br /> In general, oxygen is-con.sidered a mor e° reliable indicator of`respiration :than:carbon
<br /> Y.dioxade,`sauce carbon dioxide;sinks in .the,soil system"commonly exist.,,.Although
<br /> '-ferrous: iron may:act, as an,oxygen 'sink an the vadose zone; this generally is not
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<br /> considered',to :mfl�ience the,<<test ''results `significantly -since the respiration test
<br /> (discussed below)rwill be performed following' a oil .vapor extraction`.pilot test (�8
<br /> houi of soil venting)- to determine,air.'permeability of the soil. It is assumed that
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<br /> most or''all,available°.,ferrous-ions will be oxidized dur_frig-this.vapor extraction.pilot
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<br /> "t' •-thereb .xelimiriatin' oi• si nificantl reducin ossible oic eri:r'sinks and `
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<br /> ' mr reasing "the;reliability of the, oxygen-data collected during'the respiration test to
<br /> reflect micr6l ria"•�ae fi,vi y
<br /> If soil. gas.,vaporK concentrations and soil analytical data indicate that'the ratio.of
<br /> oxygen:to carbon"dioxide an" the rcontamiriated soil,as'siinalar'to.the biogenic'.ratio in '
<br /> the uncont'amanated `soal, then the contamination as.likely},not, a .useable. energy
<br /> source, 'for. ,the ;indigenous .'microbes and '-bioremediation .will have,; limited
<br /> ,application:-at the sate The reason for 'the lack of micro]sial'activity (toxicity,.nutrient.
<br /> 6'f,;'moasture; laanitations} may `be',evaluated Sand, adjustments made. to. the soil
<br /> r erivaronment of.possable to'einhance biodegradation of,the 'contaminants: If soil gas
<br /> A Yvapor.concentratians~indicate that'inierobial activity in the`zone:.of contamination is
<br /> above .background `levels,s, -rquantificationt`of.maximum respiration rates-under
<br /> 4. field conditions can.be carried out.: ;
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<br /> In'Si#u Respiration Test Protocols . Page 2 of 6 4' April 28, 1995
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