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r• "TREATMENT OF In DROCARBON-CONTAMINATED SOIL BY BIORENIEDIATION" by J. Donald McClenagan and Dr John P. Cummings SCS Engineers 6761 Sierra Court, Suite D Dublin, California 9456$ 'E C E I avar E L") 2.2 . a Introduction J U N 3 1991 �— ENVIRONMENTAL HEALTH California is among he few states actively pursuing implementationpWATi!e%@910% 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 citizenry of Califoi ma, 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 sates. 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 sods contaminated by simple hydrocarbons. s This paper discusses the implementation of an on-site bioremediation project performed 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 abovegrour I diesel tank had a slow leak. For thirty years diesel fuel ran down the side of the footings, soaked into the ground, and seeped beneath the footprint of the building The problem of the contaminated soil was partially addressed prior 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 contarninant(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 re.,ponsible regulatory bodies to allow future productive use of the parcel Several regulatory agencies had oversight of this particular site The Bay Area Air Cuahty Nlanagement District (BAAQMD)was contacted By definition, the contaminated material %gas defined as non-volatile, and no permit %%as required by the BAAQMD The