SITE INFORMATION AND CORRESPONDENCE

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�1 the progress of the remediation, BIO-REM utili--4 periodic vapor from the sox month Sam event also indicated a lack of ,analysis for hydrocarbons from several open )holes through- significant reduction in conll�, inant concentrations. out the site. Based on these results, SIO-REM submitted a request to the Air `. The progress and effectiveness of the bioremediation technology Force to re-inoculate the site based on their assessment that was evaluated by the SITE Program by comparing baseline (time sub-surface lithological conditions inhibited the remedial process. o)soil contamination levels to contamination levels at one month, In March of 1993 BIO-REM re-inoculated the site by injecting three months, and six months after inoculation. During each approximately 35,000 gallons of H-10 slurry into 104 boreholes sampling event, twenty borings, within a highly contaminated deepened to a depth of 23 feet below land surface.The inocula- portion of the site, were used to evaluate the process. These tion to deeper depths was implemented to overcome the sub- borings were divided into four depth intervals from four feet BLS surface lithological conditions identified by BIO-REM. In June of to twenty-five feet BLS. All samples were analyzed for benzene, 1993 a confirmatory sampling event initiated by the Air Force, in toluene, ethylbenzene, and xylenes (Method SW846 5030/8021) conjunction with the SITE Program, indicated that significant and Total Recoverable Petroleum Hydrocarbons(TRPH) (Method contamination existed at the site, and that the re-inoculation was SW846 3550/EPA 418.1). In addition, selected samples were unsuccessful in reducing the target contaminants to the project analyzed for Total Petroleum Hydrocarbons (TPH), as per the specific dean-up levels.Based on these results,these site activi- Califomia Leaking Underground Fuel Tanks Manual Method for ties were concluded. diesel contaminated soils. Demonstration Results: Results from the Demonstration indi- A final report will be available in the summer of 1994 cate that the BIO-REM process was unsuccessful in reducing For Further information: target contaminants in the soil to the project dean-up levels. EPA Project Manager. Baseline sampling indicated that a majority of the soil samples Kim Lisa Kreiton were significantly higher than the cleanup levels of 130 ppb for U.S. EPA Risk Reduction Engineering Laboratory benzene and 100 ppm for TRPH. Furthermore, soil samples 26 West Martin Luther King Drive analyzed one and three months after inoculation did not show Cincinnati, OH 45269 significant reductions in benzene or TRPH contamination (Table 513-569-7328 1). The lack of progress in the remediation prompted concerns regarding the effectiveness of the technology. It was jointly de- BIO-REM, Ina: cided between the SITE Program and BIO-REM to collect sixteen David O. Mann samples(four boreholes) at six months to determine the progress P.O. Box 116 of the remediation at the predicted end of the project. Results Butler, IN 46721 800-428-4626 -U.S.C'MWrCr WK Pfting om= IW3—sBo�ab=116 Table 1. Frequency Distribution of Benzene and TRPH for Demonstration Samp,rng Events Benzene (ppb) Number of Samples <50 50-130 130-1,000 1,000-10,000 10,000-100,000 Baseline 33 4 13 26 4 One Month 27 3 20 25 5 T hree Months 37 3 12 22 6 Total Recoverable Petroleum Hydrocarbons (ppm) Vumber of Samples <100 100-1,000 1,000-10,000 3aseline 27 33 20 One Month 29 34 17 three Months 22 30 28 United States BULK RATE Environmental Protection Agency POSTAGE&FEES PAID Center for Environmental Research Information EPA Cincinnati, OH 45268 PERMIT No.G-35 Official Business Penalty for Private Use $300 EPA/540/MR-93/527