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L <br /> ' 125 Sixth Street area. These additional investigations should be phased to: <br /> (1) provide an assessment of_lateral and vertical extent of vadose zone soil, <br /> contamination; (2) document whether groundwater has been impacted by using <br /> hydropunch or wellpoint sampling; and (3) after completion of soil and <br /> i groundwater'characterization; design and implement appropriate remedial <br /> measures: <br /> • Evaluate the most feasible!method(s) for pipeline closure after completion of <br /> soil and groundwater..investigations. The most effective approach may employ <br /> f multiple.methods of closure for discrete sections of the pipeline; and <br /> Determine if the pipeline was_ cut by county utility crews and the impact (if <br /> any) this may have on pipeline closure. <br /> f:1w18TOCKTO1q.W <br /> 7 <br />