ARCHIVED REPORTS XR0012746 - Laserfiche WebLink

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BACKGROUND TO BIORLMlED1ATI0R It is proposed that in situ bioremediation (ISO) be used at the Kayo Lodi site to clean not only the groundwater but the residual soil adsorbed hydrocarbons. The details of the proposed Mork f Plan follow. The Groundwater Contamination Assessment Report described the areal and vertical extent of pollution in the aquifers. There appears to be little petroleum hydrocarbon contamination in the vadose zone, but contamination is found at the interface of this region with the saturated zone and in the groundwater. The 1 currently operating remediation system ai '~strips the contaminants from recovered groundwa%)e''r air stripper has been in operation since October, IQr nd s `nce then to 1 June 1987 . approximately 10,O0O0OOO \ f groundwater have been treated with the resultant co ry. of over 650 gallons of [ ga . The air strip �g , Overy rate has been decreasing as oline the concentration f th g saline in the subsurface has decreased. This im that a very long-term air stripping operation. will be required to achieve the required `levei of. h remediation. Dccasionally,. at monitoring wells 10 and 13 free ... i ` product can still be found. Additional remediation efforts, s _ therefore, should be considered. Knowledge about the biodegradation of petroleum hydrocarbons has been expanding in recent years. This is exemplified by the recent book Petroleum �ticro5iolo (1). A: list of the genera " typical of hydrocarbonoclastic soil microorganisms .is found in F- r l Table 1 showing the wide diversity of both bacteria and fungi involved in-this-decomposit1on-. These-organisms--are_ubiqui_tou_s and several of the genera are likely to be present in the subsurface soils at Lodi . It is also noteworthy that all of the na-Nri. .a' 1. .x..