Laserfiche WebLink
Mar-20-97 09:26A Feb. P.06 <br /> 18 February 1997 <br /> AGE-NC Proposal No. 1265(R) <br /> Page 3 of 3 <br /> Typically, the concentration of hydrocarbon vapor is.high during the first several months of the <br /> extraction period. Therefore, we recommend using a thermal oxidizer that can process elevated <br /> concentrations of hydrocarbon vapor during this initial period. This method of vapor destruction is <br /> more economical than combustion using catalytic oxidizer with more limited vapor handling <br /> capability,requiring dilution prior"to combustion.Upon reaching concentrations that would allow <br /> combustion using catalytic oxidizer without dilution; a catalytic module will be installed in the <br /> process stream or another unit with catalytic oxidizer will be installed on a later date. <br /> Based upon our experience,it is difftcult.to estimate the actual operating cost-For example,the <br /> natural gas consumption will,vary depending on the concentrations of hydrocarbon vapor recovered. <br /> from the wells.The longer the thermal oxidizer can be operated under exothermic conditions,the <br /> lower the supplemental.fuel expenses.Some estimates of operating costs are given in the following <br /> section. <br /> In-situ vapor extraction method has proven to bean effective method for cleanup of"soil impacted <br /> with volatile compos, such as.gasoline in this case. Although technically feasible, it is cost <br /> prohibitive to perform.the remediation until non-detectable levels of hydrocarbons have been <br /> achieved. <br /> 4.0. COST SUMMARY <br /> Based on the above-specified individual costs,the cost.for remediation activities for one year(12 <br /> months)is estimated to be 546,400.00 excluding utility hook-up and consumption costs.Based upon <br /> a 6-month treatment period,the cost for remediation is estimated to be$28,450.00.Please be advised <br /> that the remediation cost in the first year includes a signifieant amount for one-time installation/set- <br /> up services. <br /> Only a rough estimate of'ihe utility cost can be made at this time. Based on our experience,the <br /> utility cost ranges approximately from 510;000,00to$15,000.00/year. <br /> Disposal/recycling of recovered product or"knock-out"water.is not included in this cost estimate. <br /> Based on our experience at remediation sites similar.to yours,the cost for these services should not <br /> exceed 52,000.00/year. <br /> v 'd a@Le 9% 6@Z ON 30V v4Q,%Jj WdZE°9 L65 t-6 t-£ <br />