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Z.1.1 VAPOR EffRAC'rION <br /> initiation of a vapor exaraction system at the site would include the installation of one or <br /> mote extraction wells and a vapor unit. The cost for tbe,�drilling, installation and set-up of k <br /> the �m would be approximately $15,000 to $20,000- Cost for equipment rental, 1 <br /> maintenance and supplementary fuel could cost np w $7,500 per month. However, with <br /> } <br /> such low coacentrations of hydrocarbons in the soil,it is u"kely that vapor extraction would <br /> effectively reduce existingbowcarbon.concentrati0JW <br /> 2.1.2 E�ICAVATIO?N ! 4 <br /> f 4 <br /> Additional excavation of impacted sail at the site could �o f 40 feet,excavation m y not be f <br /> 1 <br /> however, because the impacted sod is at depths in excess <br /> f logistically possible, <br /> Approximately 5,000 onbia yards of overburden or"clean" sod would have to be removed <br /> to exaays ted the remah ft 127 cubic yards. Additional 4 o incurred ODD fiat the removal is the <br /> awrbutden and impacted sods would be approximately $30,000 to $40,cul Casts far <br /> treatment or disposal of the impacted soil and backUiug'of the excavation could be as great <br /> as $20,000 to $30,040• <br /> Considering that greater than 90 percent Of the imps soil has been removed from the ' <br /> site at a cost of approldInKtely$140,000,an additional cost of as much as$70,000 to <br /> sail <br /> the rei�uaining 10 percent would not be justifiremove <br /> ed. �rhe:P°�•the illioan mg�F <br /> has an average bydrvcarbon concentration of an 43$`I arts per <br /> i <br /> 3.0 CONCLUSIONS J <br /> • ate 127 cubic yards of hydrocarbon impar i d soil remains at the site. The <br /> A 1'J r Tion; the total k <br /> r main* impacted sod has an average coBeentratiou ,of 4.38 parts per <br /> e of remaining hydrocarbons is 0.22 gallons. Fur�htherm�ore, the remaining impacted <br /> Volum <br /> sail isapprc"dmately 15 to 20 feet from current gFavnwater. <br /> Based upon sod samples collected from the stockpiled soil from the excavation in Ober � <br /> 1993 (Appendix C of the Quarterly Report - January 104), the average concentration of � <br /> r on release can i <br /> hydrocarbons was 194 puts per million.The Original volume of the bydrncarb these estimates, <br /> then be calculated to be appr+o]dmately 91 gallcros. Based uF°m <br /> d'h scarb'ons have beep successfisl3y removed 1 <br /> approximately 99.5 percent of the "release yd <br /> from the property. iydrocarbons are based <br /> t <br /> It should be noted that calculations of the remaining'volume el f Haat n degr ation <br /> upon. sod samples collected two to three yeaxs ago, r Y <br /> processes have decreased the volume of remaining by drocarbons in the soil sipfficantly. <br /> 2 M <br /> k <br /> I I <br /> E <br /> f <br /> _-•-va:va:r+lvlt+�aL <'LLJi./1"1`aF.'.A4-vt�:�.1,1tV[:.: •: , <br /> Bob Marty E <br /> Project Managex <br /> k , ; <br /> i <br /> I f <br /> i a <br /> i <br /> I i <br /> E j I <br /> i <br /> i <br /> I <br /> j <br /> i <br /> k <br /> ' r r <br /> i <br /> f <br /> k <br /> r <br /> jj <br /> . I 1 <br /> t {`` <br /> � S <br /> i <br /> 17 <br /> • E i <br /> 'I <br /> k <br /> k <br /> i <br /> i <br /> 'I + <br />