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Item Evaluation Criteria CommentslDiscussion <br /> 42 Well Survey Results No active water-producing wells were identified t5 <br /> within 2,000 feet of the subject site (Figure 1) 411 d u <br /> 43 Likelihood of Impact to Wells NIA <br /> 44 Likelihood of Impact to Surface No surface water was identified within 2,000 feet of <br /> Water the site <br /> 5 Risk Assessment <br /> 5 1 Site Conceptual Exposure Model The site is currently an active fuel station The area <br /> (current and future uses) surrounding the site is commercial Future use of the <br /> parcel is assumed to be similar to current use If the <br /> site were to change use, sampling required following <br /> tank removal would identify any risk exceedances <br /> and residual hydrocarbons that potentially pose a risk <br /> could be addressed at that time <br /> 5 2 Exposure Pathways An exposure evaluation flowchart is included as <br /> Attachment 8 <br /> 5 3 Risk Assessment Status No formal risk assessment has been performed at this <br /> site However,because it appears that the majority of <br /> shallow volatile hydrocarbons were removed during <br /> SVE from 1992 through 1996, it is unlikely that 2 <br /> hydrocarbon concentrations in soil pose a risk to site , <br /> occupants Based on the hydrocarbon distribution in <br /> soil, it is also unlikely that adjacent properties are at <br /> - - risk - <br /> Based on the low benzene conceV#ations in shallow <br /> groundwater shown on Figure 5, it is unlikely that <br /> benzene in groundwater poses a risk either on-or off- <br /> site <br /> 54 Identified Human Exceedances NIA <br /> 5 5 Identified Ecological NIA <br /> Exceedances <br /> 6 Additional Recommended <br /> Data or Tasks <br /> 6 1 Continued Shallow Zone Continued groundwater monitoring is warranted to <br /> Monitoring with Reduced assess MTBE and TBA concentration trends on-site <br /> Frequency and north of the site However, quarterly sampling is <br /> not warranted for all wells <br /> 6 2 Additional Lateral Plume Additional CPT borings are warranted north and east <br /> Assessment of the site to further assess the lateral extent of <br /> impact to groundwater below 40 fbg and to further <br /> assess the lateral extent of oxygenates in shallow <br /> groundwater downgradient of MW-9 <br /> 0778 5 <br />