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�: Lammersville School District July 16, 1990 202/899.7004 16 2(located at the gasoline fuel dispensers location) revealed the presence of benzr le 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 of BTEX in MW-s,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. Additionalsoil sampling and analysis will be necessaryto delineate the extent of petroleum hydrocarbons in the soil in this area. 9.0 REMEDIATION ALTERNATIVES Potential methods to clean up the groundwater beneath the site ate dictated largeiy by the dapth 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 remediaf action. The treatment options that were studied included: v 1• No action, 2• Groundwater extraction and treatment, 3• In situ biodegradation- 9.1 NO ACTION Tne'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 oxidation has been 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, GROU\U1lt1TER TECH\Y)LQCI••1\C.