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2 . Include the former manmade drainage channel location as a <br /> potential contamination area. Sample sediments at the <br /> bottom of the channel, and soil samples (or soil gas) from <br /> around or beneath the drainage channel should be considered. <br /> 3. Identify the locations and lateral extent of the former <br /> drum/material storage areas on a site map. Focus additional <br /> questions on historical use to identify what materials <br /> and/or hazardous constituents were managed at these drum <br /> storage areas. Analytes should be appropriate for all <br /> hazardous constituents ever stored in each area. <br /> 4. Identify the source of the parallel striations near Burn Pit <br /> #2 (SWMU No. 8) and other graded, bulldozer-scarred areas in <br /> the southern portion of the facility. If appropriate, <br /> continue investigation as a potential contamination area. <br /> 5. The current SWMU list identifies SWMU No. 22 : Former <br /> Hazardous Materials Storage Area as operating between 1975 <br /> and approximately 1985. There is no evidence in the EMSL <br /> aerial photographs (March 1975; July 10, 1982 ; July 28, 1983 ; <br /> April 1, 1985; or June 23 , 1987) that this unit was present <br /> in the location shown in Figure 3. 1 of the SWMU Engineering <br /> Report. Could SWMU No. 22 have different dimensions and/or <br /> be located elsewhere? Was this unit used on only a periodic <br /> basis? <br /> 6. A photograph in Appendix A of the October 12980 Installation <br /> Assessment of Defense Depot, Tracy, California, by the U.S. <br /> Army Toxic and Hazardous Materials Agency, identifies a "new <br /> incinerator" next to the sewage treatment plant. More <br /> information is needed on this incinerator. <br /> 3 <br />