ARCHIVED REPORTS_XR0008363 - Laserfiche WebLink

Home Browse Search

28 April 1995 AGE-NC-95-0103 Page 11 of 11 volume increases and the microbes encounter decreasing hydrocarbon concentrations toward the margins of the contaminant plume Based on the volume and concentration of the impacted soil, the usage of one inoculation well and the relatively high permeability of soil, we estimate that remediation may take between 12 and 30 months If only one inoculation event is performed, approximately 100 gallons of inoculum will be utilized 5 3 6 FEASIBILITY No feasibility studies for in-situ bioremediation halve been performed at the site I5 _37 ESTIMATED COSTS OF Ill'-.SI J U BIOREMEDIATION The cost for 3n-situ bioremediation will \an, depending upon the volume of inoculant required and the number of remediation wells to be inoculated Generally, the cost for in-situ bioremediation will range from $20,000 to 560,000 Weekly and monthly monitoring will generally cost between $1,500 and $5,000 per month, soil borings to monitor bioremediation progress typically cost $3,000 to $6,000 per quarter If a low pressure air system is required at the site to provide o\ygen to the bacteria, installation of a typical blower system will cost between $2,000 and $4,000 Maintenance casts for the blower s}stem are minimal Z ' 6.0. RECOMMENDATIONS Based upon the relative costs and feasibilit\ of a\ailable remediation methods, we recommend the Iinstallation of a soil vapor extraction sN steni at the site Based upon data collected during the vapor e\tiaction pilot test, N\e recommend installation of a thermal oxidation unit Extraction from RW-1 should successfully remove hS drocarbons from the vadose zone We do not belle-,e that addtional e\traction wells will be required 7.0. LIMITATIONS I Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were mainly based on analytical j esults provided by an independent laboratory Evaluations of the geologic conditions at the site for the purpose of this investigation are made from a limited number of available data points (i e monitoring and vapor wells) and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional recommendations contained in this report I