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was constructed as previously described except partition embank- <br /> ments were not included. Each of the ponds one through five are <br /> interconnected by flow pipes which prevent overtopping of embank- <br /> ments and which maintain the perimeter freeboard at the appro- <br /> priate levels. <br /> #3 "Incompatible wastes were combined in trench #3 which <br /> caused a chemical reaction and formed H 2 S toxic gas (see interim <br /> discharge specification 3b)" <br /> RESPONSE <br /> In attempting to clean settled solids from evaporation pond <br /> #1, the drilling mud fraction of the waste was lifted by drag <br /> line and dumped into group 1 waste trench #3 . Almost immediately <br /> following the beginning of this operation it was noted that minor <br /> reactions were taking place in the bottom of waste trench #3 and <br /> an H 2 S gas odor was developing. The cleaning operation involving <br /> the transfer of drilling mud was discontinued immediately. <br /> Analysis of the two wastes were reviewed and the consulting <br /> chemist was advised of the reaction. At this time we have not <br /> resolved exactly what reaction was taking place, however, the <br /> cleaning operation will not continue until we have determined the <br /> cause of the reaction. <br /> #4: "The lack of sidewall liners does not prevent lateral <br /> migration into sand stringers above the lower 7 feet of the <br /> trench walls" <br /> -4- <br />