Laserfiche WebLink
J <br /> , <br /> 1I <br /> 04 March 1996 ' <br /> ' -AGE-NC Project No 95-0144 <br /> Page 17 of"18 <br /> ' 7 3 3 FEASIBILITY STUDIES <br /> } <br /> Results of the bioremediation pilot tests at other sites indicate that lighter petroleum hydrocarbons, <br /> such as gasoline compounds are biodegraded more readily than longer-chain (heavier) hydrocarbons; <br /> such as diesel fuel compounds No feasibility studies have been performed at the subject site . <br /> 7 3 4 DURATION <br /> ' Cleanup durations for nn-situ bioremediation will vary, depending upon specific site characteristics <br /> However, 12 to 24 months is generally considered an achievable remediation time Since dissolved <br /> ' hydrocarbon concentrations at the site are low, a cleanup period of 12 months is likely <br /> t , <br /> ' 7 3 5 COST <br /> Bioremediation of ground water can be a very cost-effective method of treatment With little on-site <br /> equipment required beyond the initial inoculation, the cost for fez-situ bioremediation at the Chase <br /> Chevrolet -Madison site would be between $40,000 00 and $60,000 00 However, monitoring will <br /> vary depending upon regulatory requirements, which could significantly increase the total cost of the <br /> ' prof ect <br /> f <br /> Typical costs for monthly monitoring of an in-situ bioremediation'system, in addrtion'to standard <br /> quarterly sampling, would be approximately $1,500 00 per month Based on a one-year treatment <br /> period, the total cost for in-srm bioremediation at the Chase Chevrolet - Madison site would be <br /> ' between $60,000 00 and $85,000 00 <br /> ' 8 0. RECOMMENDATIONS FOR RENIEDIATION OF HYDROCARBON- <br /> IMPACTED SOIL AND GROUND WATER <br /> ' The vertical and lateral extents of hydrocarbon-impacted soil in the vicinity of former UST Nos I <br /> and 8 are limited Excavation of impacted soil can easily be accomplished using a backhoe or <br /> excavator Small volumes of impacted soil may not be reachable with excavation near UST No 1 <br /> ' However, due to the limited lateral extent, only a small volume of impacted soil would be left in <br /> place <br /> f <br /> No petroleum hydrocarbons were detected in samples collected in the vicinity of former UST No 2 <br /> Therefore, we recommend no remediation be required in thi's location <br /> Impacted soil in the vicinity of UST Nos 3 through 6 occurs piirnaifly at a depth of 15 to 25 feet bsg <br />