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-3- <br /> B) All pipes and soil from six inches above the pipe to <br /> the deepest part of the excavation shall be handled <br /> and disposed of as hazardous • waste unless ECC can <br /> demonstrate that the material is not hazardous. <br /> (265. 111) <br /> 3) Within 60 days of completion of the closure, ECC shall <br /> submit to DHS a certification that the tank and <br /> associated piping have been closed in accordance with the <br /> specifications in the approved Closure Plan. The <br /> certification must be signed by the owner or operator and <br /> by an independent registered professional engineer. The <br /> certification must include a description of sampling <br /> methodology, sample locations, analytical results <br /> (including quality control and quality assurance) , sample <br /> chain of custody logs, field measurements, waste <br /> manifests and disposal records, photographs, and <br /> additional supporting documentation as appropriate. A <br /> description of the work performed and analytical results <br /> from the tank decommissioning and partial pipeline <br /> removal performed in May, 1987 , shall also be included. <br /> (265. 115) <br /> 4) This CP assumes there is moderate soil contamination and <br /> no groundwater contamination. If, during excavation, it <br /> is discovered that soil contamination is extensive and <br /> groundwater contamination is suspected, ECC will be <br /> required to submit a plan for additional sampling and <br /> remediation of the contamination. (265. 197) <br /> 5) During the closure process, ECC shall collect samples and <br /> submit them to a certified laboratory for analysis <br /> according to the matrix in Figure 1 at the location shown <br /> in Figure 2 . The sample Analysis Schedule proposed in <br /> the April 26, 1989, CP shall not be used. <br /> (265. 112 (b) (4) ) <br />