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' Item 3) All ofthe bag house dust has been removed from the property by Safety Kleen (Wichita), <br />Inc. on December 29, 1998. Jeff Dexter of Safety Kleen has told us that the material is currently at <br />' their plant and is undergoing tests to see if the levels of 2,4-D have dropped below 10 mg/Kg. All <br />paperwork on the removal from the site is enclosed in Appendix .4. Safery Kleen will properly and <br />' permanently dispose of the material. <br />' Item 4) This item raised the question ofcross-contamination of sampling during the excavation <br />process with either a front end loader or backhoe if the machine buckets are not washed or steam- <br />cleaned after every bucket. <br />' Accurate sampling must occur for each machine bucket excavated in order to provide the neccessary <br />data. However, washing or steam cleaning of each bucket could produce a significant quantity of <br />' waste water for which there is no practical disposal method. Also, the sensitive location of the site <br />near the Eagle River and local groundwater make it desirable to minimize washwater that may <br />contain 2,4-D and TPH, especially when considering the low levels of 2,4-D allowed in water. <br />1 As an alternative to washing or steam cleaning, we commit to the following measures: <br />a) conduct the excavation during dry conditions, when the pile material will not stick to the machine <br />bucket readily. <br />' b) if any excavated material sticks to the machine bucket, it will be removed manually and sent to <br />either the truck for disposal or left on site, depending on the PID reading for that bucket. <br />' c) samples of each machine bucket for the PID tests would consist of a composite of 6 to 10 samples <br />taken from various locations within the bucket but in all cases, the immediate sides of the bucket <br />' would be avoided as a precautionary measure. Since the machine bucket is over 2 cubic yards in <br />capacity, any potential cross-contamination would be very small and this sampling procedure would <br />help avoid it. <br />Item 5) -Dames and Moore has made a more detailed map of the gravel piles and sample locations, <br />' which is enclosed as Figure 3. The samples were taken at 20 feet intervals around the outside <br />perimeter of each pile and were extracted from a point 3 feet high from the bottom of the piles and <br />approximately 6 inches below the surface. <br />