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r ' I _ I 1 f 2$ February 1997' AGE-NC Project No 95-0144 ' Page 11 of 20 ,I I , I 5 3 4 MONITORING,ACTIVITIES 'j After inoculation,,the inoculation wells and ground water monitoring wells should be monitored for` ' several months by periodic field,measurements of organic vapor, carbon dioxide, and oxygen, concentrations Quarterly or semi-annual monitoring activities should include the installation of soil , f a borings to collect soil samples to monitor bacterial populations, nutrient availability and soil remediation progress If monitoring indicates areas of slow remediation, additional inoculations may be required r ,I E 5 3 5 DURATION Duration(and cost) are dependent on the volume of soil and water to be remediated, the number of inoculation and monitoring wells, the average concentrations of contaminants and nutrients,'and the temperature and permeability of the soil Theoretically, the radius of influence of the inoculatiori well should inciease rapidly at first, then gradually decline as the affected volume increases and the r bacteria encounter decreasing hydrocarbon concentrations toward the margins of the hydrocarbon , plume Shorter-chain hydrocarbons are typically consumed first and longer-chain hydrocarbons later Remediation at sites with similar soil composition typically takes between 12 and 24 months I 1513b FEASIBILITY No feasibility{studies for in-situ bioremediation have been performed at the site The longer-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 physicochemical properties necessary for effective bioremediation The results will be { used to evaluate the need for parameter adjustment, if necessary, to facilitate effective biodegradation t r I ' 5 3 7 ESTIMATED COSTS FOR IN-SITU BIOREMEDIATION The cost for iri-situ bioremediation will vary, depending upon the volume of inoculant required and the number of remediation wells to be inoculated Generally, the initiation cost for in-situ bioremediation will range from $35,000 00 ,to, $75,000 00 Weekly and monthly monitoring , generally costs between$10,000 00 to $20,000 00 annually, soil probings to monitor bioremediation ,11 progress typically averages $5,000 00 to $10,000 00 annually Total costs for bioremediation of soil at the subject,site is estimated to be between $60,000 00 and$110,000 00 Ir I I I '7 , s