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�! "TREATMENT OF HYDROCARBON-CONTAMINATED SOIL BY BIOREMEDIATION" by J. Donald McClenagan and Dr John P Cummings SCS Engineers 6762 Sierra Court, Suite D Dublin, California 94568 RE C E I l D" Introduction J 1991 ENVIRONMENTAL HEALTH California is among the few sates actively pursuing implementationp9pMPeW91,44 i of hydrocarbon-contaminated soils The soils, generally speaking, became contaminated from leaking underground storage tanks, pipelines, or from fuel or chemical spills. The Tanner legislation, which initiated County Hazardous Waste Management Plans, required that all counties maintain a plan for handling the hazardous wastes within their counties Due to this legislation and in the interest of the c.tizenry of California, there has been a marked leaning towards on-site cleanup of contaminated soils within the state, as opposed to the alternative method of excavating and transporting the material off-site to suitable disposal sites The cost of excavation, transportation and disposal of hydrocarbon-contaminated soils to final disposition has become somewhat prohibitive in many cases; hence, more cost effective, albeit possibly less sophisticated, methods are being developed and utilized to remediate contaminated soils, especially those soils contaminated by simple hydrocarbons. � This paper discusses the impleirientation of an on-site bioremediation protect perform4d on soils saturated with spilled diesel fuel. Background The site in question was a former clay tile manufacturing facility which utilized diesel fuel -for firing the ovens and kilns For some thirty years the aboveground diesel tank had a slow leak For thirty years diesel fuel ran down the side of the footing,,, soaked into the ground, and seeped beneath the footprint of the building The problem of the contaminated soil was partially addressed Frior to the involvement of SCS Engineers (SCS) by the excavation and treatment of the contaminated soil outside the footprint of the building The building was eventually demolished, thereby facilitating the determination of the extent of contaminated soil beneath the building and the treatment of the contamination thus defined SCS Engineers was selected by the client to characterize the contaminant(s) and its (their) extent, develop alternative remediation plans, implement and complete the chosen remediation plan, and procure the closure of the site by the various responsible regulatory bodies to allow future productive use of the parcel Several regulatory agencies had oversight of this particular site The Bay Area Air Quality Management District (BAAQ1%4D) was contacted By definition, the contaminated material was defined as non-,olatile, and no permi %as required by the BAAQ\ID The