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Larry Perino Page 3 eptember 5, 1994 <br /> collection and from clearing the slickline after completing filling <br /> the form. The position of the cofferdam should effectively prevent <br /> acid mine water from contacting the upstream face of the bulkhead. <br /> The limestone placed between the cofferdam and the bulkhead should <br /> be more effective because any acid mine water bypassing through the <br /> Terry Tunnel Bulkhead will be picked up before contacting the <br /> limestone. <br /> Congratulations on another very difficult job well done. I <br /> was impressed by the care with which the Terry Tunnel Bulkhead was <br /> constructed and the crew's efforts in filling the bulkhead form. <br /> sincerely, <br /> 1 , � /A- <br /> iodhnF. Abel, Jr. <br /> Colorado P.E. 5642 <br />