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Letter/Ann H. Posey Paget Maest/12-31-93 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 wh this may be occurring. if the variation is a seasonal trend, and the decrease is an apparent artifact of having only a partial ye is worth of sampling and analysis, there will be no further inqu ry. If not, we will evaluate the situation further. 5. Page 9, first full paragraph states, in part: "Dil~tion of the sample prior to adding the spike would have result d in a more reliable spike recovery value." It seems to me, if I understand the situation correct~y, that the problem arose not because of the sequence during whic the sample was diluted, but rather in the amount of the diluent. It might be more appropriate to word this suggestion more in line ith the way it is worded in the conclusion section. The conclus'ons section seems more consistent with my understading of the si uation. I 6. Page 9, second full paragraph, refers in part to sever 1 pieces of data that were.mis-reported by the laboratory, and a subsequent phone conversation which apparently cleared up th reporting error. There is nothing in the appended documents that wo ld lead a reviewer, independently, to draw the conclusion reac ed through the phone conversation. Also, it is certainly poor 1 b practice to correct results by phone. Therefore, RCG/HBI shoul procure a letter of explanation along with physical information from Core labs regarding this set of analyses, which will doc ment Core Labs' assessment. Without that information, the lab hould re- analy2e either these samples or new samples from these pollection points. Overall, I am alarmed by the number of paper and analytica~ 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 agre I think it would be appropriate to recommend measures to correct th problem. Another sampling trip may be appropriate, use of another 1 b may be appropriate, or you may have other recommendations.