SITE INFORMATION AND CORRESPONDENCE

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~ Vftw S.04 Idlewild Page 2 Residual petroleum hydrocarbon contamination was evidenced in the excavation sample collected from the north sidewall of up to 1,400 ppm Total Petroleum Hydrocarbon- gasoline, 3,200 ppb Toluene, 5,900 ppb Ethylbenzene, 6,500 ppb Xylene and 5.3 ppm Ethylene Dibromide. Also, note that the detection limit used for benzene analysis was elevated to 1000 ppb, due to the concentration of contaminants detected. Pit 1 was subsequently backfilled with pea gravel. The contaminated soil which was excavated from Pit 1 is pending treatment once a San Joaquin Valley Unified Air Pollution Control District permit is issued. Confirmation soil sampling will be necessary to verify the completion of soil treatment. No contamination was detected in the samples collected from beneath tank #6 or soil borings beneath tanks #1 and #5 located in Pit 2. No further investigation is required in the area of Pit 2. The Condor report recommended that at least 3 - 5 feet of soil be removed from the north sidewall of Pit 1. The Oil Equipment correspondence indicated that additional over excavation was not a feasible remedial alternative due to structural integrity problems and instead suggested in-situ bioremediation. Prior to evaluation of a detailed proposal for in-situ bioremediation, the extent of soil contamination must first be determined. Please submit by October 29, 1993, a work plan to continue the investigation of contamination evidenced in Pit 1. If you have any questions or comments, please contact Mary Meays, Senior REHS, of my staff at (209) 468-0337. Jogi Khanna, M.D., M.P.H. ealth Officer Donna Heran, REHS, Program Manager Environmental Health Division LAC/MIVI/IDLEWILD, c: Elizabeth Thayer, CVRWQCB c: Eric Trevena, PHS/EHD c: Keith Tallia, Oil Equipment Services c: James Wack, Condor