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i f 04 March 1996 AGE-NC Project No 95-0144 u Page 12 of 18 ' 6 3 4 MONITORING ACTIVITIES After inoculation, the inoculation wells and groundwater monitoring wells should be monitored for several months by periodic field measurements of organic vapors, carbon dioxide, and oxygen Ground water samples should be collected and analyzed for petroleums hydrocarbons to monitor ' progress of the remediation Quarterly monitoring activities should include the installation of soil boring to monitor bacterial populations, nutrient availability and soil remediation progress If monitoring, indicates areas of slow remediation, additional inoculations may be required 613 5 DURATION Duration and cost are dependent on the volume of soil and water to be remediated, the number of inoculation and monitoring wells and the frequency of monitoring, the average concentrations of ' contanunants and nutrients, and the temperature and permeability of the soil Theoretically, the radius of influence of the inoculation well should increase rapidly at first, then gradually decline as the affected volume increases and the bacteria encounter decreasing hydrocarbon concentrations toward , the margins of the hydrocai bon plume Shorter-chain hydrocarbons are typically consumed`first and longer-chain hydrocarbons later Remediation at sites with similar hthologies typically takes between ' 18 and 36 months s 6 3 6 FEASIBILITY No feasibility studies for in-situ bloremediatkon have been performed at the site The loner-chain ' hydrocarbons in the vicinity of former UST No 1 would require a longer remediation period If bioremediation is chosen as the method of remediation, soil samples should be collected and analyzed for physicochenucal properties necessary,for effective bioremediation E 6 3 7 ESTIMATED COSTS FOR IN-SII U BIOREMEDIATION _ The cast for in-situ bioremediation will vary, 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 $35,000 00 to $75,000 00 Weekly and monthly monitoring generally costs between $1,500 00 to $5,000 00 per month, soil probes to monitor bioremediation progress typically averages $;,000 00 per quarter Total costs for bioremediation of soil at the subject site will be between ' $70,000 00 and $120,000 00