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AOC Work Plans <br /> 4.7 Asphalt Rubble Area <br /> Site Summary <br /> The Asphalt Rubble Area is located in the northeast comer of the Site(Pla a 4.7) and was identified <br /> as an AOC by the DTSC during the February 9, 2005,meeting because it as erroneously <br /> communicated to them that this area received asphalt debris from offsite sources. Based on recent <br /> communications with AMMC personnel,this was a low area of the Site where facility personnel <br /> spread rubble from past construction and excavation operations. AMMC is in the processing of <br /> contacting asphalt batch plants to determine if they will accept the rubble. Once an acceptable <br /> facility is identified,AMMC will scrape off the rubble(including the top approximately 3 to 6 <br /> inches of soil)for reuse in road beds by the asphalt batch plant. <br /> Previous Investigations <br /> No previous investigations have been performed in the Asphalt Rubble Ar a. <br /> Data Gaps <br /> Due to the unknown nature of the rubble,it is speculated,that it could coni am PAH and TPH <br /> compounds. Soil samples should be collected from native soil below the mbble and analyzed to <br /> assess potential PAH and TPH impacts to soil. <br /> Field Investigation Approach <br /> To evaluate whether residual contamination is present in native soil below the Asphalt Rubble <br /> Area,four near surface soil samples will be collected at depths of approxiately 6-inches bgs at the <br /> locations indicated on Plate 4.7 and analyzed for PAHs,TPHd,and TPH . All samples will be <br /> collected with a drive sampler and 6-inch diameter stainless steel tubes us' g sampling protocols <br /> discussed in the SAP(Appendix A). <br /> Draft <br /> KB61125 workplan-ESC MACTEC Engineering and Consulting, Inc. 51 <br /> September 28,2005 <br />