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EPA File No. CO5000- 03745, San Juan County, Colorado <br />3rd Quarter 1999 Report (July — September) <br />Page 2 <br />included with this report. The analytical results for the 2nd Quarter, June 26, <br />1999, sample are also included. The Terry Tunnel bulkhead samples have <br />had a high pH (11 -12) since pump back from the settling ponds was started <br />even though no alkaline material has been added. It appears that lime (either <br />pumped in previously or stacked against the bulkhead) is being activated or <br />stirred up from the pumping. <br />Inspection of the bulkhead and immediate tunnel area did not reveal any <br />reason for concern or give any indication that the bulkhead is not performing <br />as designed. The bulkhead valve remained open to accept pump back from <br />the Terry Tunnel settling ponds to eliminate any potential for pond <br />discharge. <br />American Tunnel Bulkhead <br />The American Tunnel bulkhead was inspected, gage pressure readings taken, <br />and fluid samples analyzed for pH, conductivity, and temperature more <br />frequently than the requirements of Items 3. This information is attached. <br />Site inspections have not revealed any indication that the bulkhead is <br />performing other than as designed. <br />