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Q. No comment? <br />A. No. <br />Q. Are you able to comment, for example, with <br />respect to page 3,04 and let's say, for example, the <br />Mamaron data which shows residues, if you allow a <br />subjective judgement, for example, in 1967, a <br />fairly constant rate throughout the year and tell <br />us whether or not that indicates to you that these <br />are agricultural or non-agricultural sources? <br />A. No, I have no basis for comment. <br />Q. Let's go back to page 243 and notice in the <br />next column of Table 5 that Georgia is the state <br />reflecting the maximum value in PPB. Are you able <br />to comment about that? <br />A. No, I am not. <br />Q. If you will turn to the Georgia section and <br />particularly the Lazareth Creek data, Station <br />Number 1, for example; are you able to advise us as <br />to the existence of one or more wool treatment <br />plants on this creek? <br />A. No, I am not. <br />To some people, giving testimony as an expert witness is a challenging <br />experience which starts the adrenalin pumping and prompts an attempt to answer <br />all questions which are posed. A good lawyer will endeavor to draw an expert <br />away from his area of expertise to a topic on which the witness knows enough <br />to want to answer the questions but not enough to avoid being trapped. The <br />witness also can be led into this unfortunate situation by a client and lawyer <br />who wish to prove a point by forcing the witness to "expand a little upon this <br />expertise." The example which follows is of a witness who rose to bait offered <br />by the interrogator. The witness, who was a chemist, had just presented data <br />on the runoff of pesticides from a cornfield during a heavy rain. (Rogers <br />1974:17-18). <br />Q. Over the course of five years, Doctor, how <br />many days would you expect that kind of rainfall to <br />occur of that intensity? Did you have any way of <br />making an estimate? Iowa weather? <br />A. Yes, I could make an estimate. <br />Q. Out of five years, what would your estimate <br />be? <br />A. Well, I won't be numerical. <br />18