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the monitoring wells on a quarterly basis for at least one year so that plume stability can be <br /> evaluated over one seasonal hydrologic cycle Groundwater samples should be analyzed for <br /> TPH-as-diesel, TPH-as-gasoline, BTEX and MTBE by modified EPA Method 8015/8020 The <br /> first set of quarterly groundwater samples should also be analyzed for the oxygenate <br /> compounds by EPA Method 8260 <br /> 2 Given the plume characteristics derived from the monitoring well sampling results, assess the <br /> risk to human health and the environment associated with the impacted soil and groundwater <br /> The initial risk assessment should include the identification of nearby sensitive receptors (i e , <br /> water supply wells and surface water bodies) as part of performing a Tier I/Tier II evaluation, in <br /> accordance with ASTM Standard E1739 <br /> 3 Based on the site characterization data and risk assessment results, evaluate the necessity, <br /> feasibility and practicality of active soil and groundwater remediation Interim remedial action <br /> may be required to remove any free product present on the groundwater surface and/or <br /> residual hydrocarbon mass below the groundwater surface <br /> 12 <br />