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Lammersville School District 202/899.7004 July 16, 1990 16 2(located at the gasoline fuel dispensers location)revealed the presence of benzene above the drinking water MCL. The groundwater samples collected from the remaining wells on site revealed the presence of trace concentrations of TPH-G;however,none of them contained BTEX above method detection limits (Figure 5). Conversely,the benzene plume in the groundwater appears to be localized in the vicinity of MW-2 and MW-6(Figure 6). The absence or BTEX in MW-5,MW-7,and MW-8 indicates the extent of the BTEX plume has been sufficiently defined to design a remediation strategy. Additionally,the distribution of BTEX in the groundwater indicates the source of the petroleum hydrocarbon leak to be the gasoline fuel dispensers and/or associated piping. Additional soil sampling and analysis will be necessary to delineate the extent of petroleum hydrocarbons in the soil in this area. 9.0 AEMEBIATION ALTERNATIVES Potential methods to clean up the groundwater beneath the site are dictated largely by the depth and extent of the petroleum hydrocarbon plume, and the subsurface geologic conditions. The remediation methods that were identified as possible alternatives for treatment of groundwater at the site were studied for the technical feasibility and cost effectiveness of each remedial action. The treatment options that were studied included: 1. No action. 2. Groundwater extraction and treatment. 3. In situ biodegradation. 9,1 NO ACTION The no action`alternative would consist of a carefully designed monitoring and sampling program to monitor the natural attenuation of the levels of petroleum hydrocarbons. The natural breakdown of petroleum hydrocarbons in the subsurface through biodegradation and oxidatior has hcan well documented in the literature. The rate of hydrocarbon migration at the site is slow. Accordingly, it may be possible to monitor the site and let natural processes eliminate the petroleum hydrocarbons without posing any risk to the environment. A fate-and-transport model would be required to confirm this. A contingency plan would be developed in the event that significant petroleum hydrocarbon migration occurs. GROUNDWATER „__ TECHNOLOGY,INC.