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uu cf w��o ria ca T-"MN GI'IV IISUIYI'=1A 1 L- II <br /> R,El1RED AL imN PLAN AJDENDU #1 <br /> USA PE-f;R01,ELJA4 STATION 5 <br /> FEBRUARY, 1996 <br /> OPTION'I-Pamive Soil R6medition <br /> Passive kfil iefflad on relie'. on I e Onciple that petroleum hydrocarbon compounds will <br /> naturally de �:or mate ove Vine- Such degradation and/or attenuation can be attributed <br /> in part tb testa lie d Co-rrietabolic processes occurring between indigenous microorganisms <br /> found in soil ad the ydroct ban ao��pounds of concern. Under proper circumstances,passive <br /> rernediaiionbe a.t�e appro� h6ice. Sites,with soils having adequate populations of <br /> hydrocarbon g bacteria,nutr nts and oxygen levels may be a good Choice for this <br /> alteunativt~. A tionWly,sites in a rr�s which pose little risk or drmat:for potential human,contact <br /> may also be a bi to this.alternative- Groundwater monitoring would still be required to <br /> assess the:'effectiveness of this>LA on hydrocarbon impacted sail and groundwater, and m assess <br /> potential.ciffsi mi tion of the d ssolved hydrocarbon plume. <br /> The cosi of thL, optic woold be ibnited to porforming regularly scheduled gtvundwate€ <br /> nionitoring.,Pwk2n <br /> cipatesigrow,dy ater monitoring will be continu6d for approxin>ately four <br /> gum-Mrs ai a c stof proxit nater $12,200.00 per quarter. <br /> oPrION 11- Soil �apor EX 'dn With Off-Gas Treatment <br /> Soil vapoi exitraction OVE)is desi gnod to volatilize and remove hydrocarbon compounds present <br /> beneath the silk.as: <br /> vapor an the vadose zone; and <br /> to a liote d degree,dissolved hydrocarbons in the groundwater. ; <br /> E <br /> A,-troleuari hydwarbbn carnxpauon l eneath the site appear too the confined to a relatively small <br /> area inw is ly su irovndiag the cluster.Therdore,it appears that the hydrocarbon <br /> impacted reale Tibe 'th the site should be accessible by the use of soil vapor extraction. <br /> Analytical rabox y results a soil and groundwater Samples collected from previously installed <br /> wells indicaw at th hydroi-arbod Compounds are primarily in the gasoline hydrocarbon range. <br /> Analytigal of oil santles c:)�ected during previous investigations have£ailed to detect <br /> suit Con air 'ons of hydra�carbons- SVE testing yielded relatively high concentrations. <br /> Hydrocarbon inaguc soil is antic* ted to extend too the water table-approximately 47 to 50-feet <br /> below mound urf (bgs)_ 'While the vapor concentrations were high,the amount of actual <br /> hydroca6on ci kmpou�ds present is believed to be small. Therefore,it appears possible to <br /> effectively re the site'Usin "Wr extraction by utilizing the existing wells in the area <br /> immediately s =-ng the.tank luister,and to perform the remediation within a few month <br /> period. 'lt* tion Elssumes'the uh�f a hydrocarbon destruct unit of sorne We. <br /> f 2 <br />