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Letter/Ann Maest/12-31-93 H. Posey Paget 4. I note with interest that the pH of well M-13 had been consistently decreasing over the past year. The Division will ask BMRI about this observation and try to determine why this may be occurring. If the variation is a seasonal trend, and the decrease is an apparent artifact of having only a partial year's worth of sampling and analysis, there will be no further inquiry. if not, we will evaluate the situation further. 5. Page 9, first full paragraph states, in part: "Dilution of the sample prior to adding the spike would have resulted in a more reliable spike recovery value." It seems to me, if I understand the situation correctly, that the problem arose not because of the sequence during which the sample was diluted, but rather in the amount of the diluant. It might be more appropriate to word this suggestion more in line with the way it is worded in the conclusion section. The conclusrions section seems more consistent with my understading of the situation. 6. Page 9, second full paragraph, refers in part to sevexal pieces of data that were,mis-reported by the laboratory, and a subsequent phone conversation which apparently cleared up the reporting error. There is nothing in the appended documents that would lead a reviewer, independantly, to draw the conclusion reached through the phone conversation. Also, it is certainly poor lab practice to correct results by phone. Therefore, RCG/HBI should procure a letter of explanation along with physical information from Core labs regarding this set of analyses, which will document Core Labs' assessment. Without that information, the lab should re- analyze either these samples or new samples from these collection points. Overall, I am alarmed by the number of paper and analytical mistakes made by Core Labs on this particular set of analyses. If you feel that my alarm is undue, please let me know. However, if you agree, I think it would be appropriate to recommend measures to correct the problem. Another sampling trip may be appropriate, use of another lab may be appropriate, or you may have other recommendations.