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6. Appendix D, Section D.2 . 6. 3. , Page D-6 <br /> The text states that matrix and blank spike recoveries were <br /> within the accuracy of approved work plan limit (AWPL) for <br /> TCLP extractions analyzed for metals. The lab's Executive <br /> Summary shows that in the analysis of the sample of waste <br /> drill cuttings for Well 2 , arsenic was present at greater <br /> than four times its spiked level and therefore the matrix <br /> sample does not provide useful recovery data. The pH of <br /> this sample was 11. 3, significantly higher than the waste <br /> cutting samples from Well 1. Please expand the text to <br /> reflect this result. <br /> 7. Appendix D, Section D.2 . 10.1, Page D-8 <br /> The Well 2 waste cuttings sample, retrieved May 7, 1992 , was <br /> originally provided to the lab in insufficient quantity to <br /> perform all the analyses ordered. Additional sample was <br /> retrieved on May 12 , 1992 and delivered to the lab. <br /> According to the laboratory Executive Summary, elevated <br /> levels of "high boiling point hydrocarbons other than <br /> diesel" caused substantial matrix interference in the diesel <br /> analysis. Please discuss the significance of the presence <br /> of this high boiling point hydrocarbon. <br /> 4 <br /> i <br />