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JUL- 5-,95 WED 227 PM TESSE~CT PRODUCTIONS FAX N0, 379713 Excavation of the proposed borrow area "m bedrock" is likely m produce precious little material in tttaay places. The "lumps' under the present liner along the back wall are there because they are exposed bedrock. Excavation of any significant volume of material is going to require blasting or equivalent heavy material removal technology. While we see m reason in principle why this canoe[ be done, it does raise certain practical difficulties. Is "the edge" m which the 3` HDPE tubing will be extended the west/aorthwest edge or ? Also, will the tubing exit through the liner really occur oa the soutltwrtit, rather than the southeast? Topsoil Removal flow is "topsoil" effearvely defined SO SS m be understandable m the heavy equipment operator on site? We wonder, for example, wlrethcr the interim embanlmieat raise has been accomplished with "decayed granite" or with (mostly) mpsoil re-identified as something else. ]3orrow Area Excavation Achieving a satisfactory interface between the existing pond edge and the botmm slope of the pond extension will be tricky, given the presence of old liner, deposited tailings, and the necessity for proper bedding laydown and compaction. This process deserves some further discussion. Again, bedrock is already exmced in places along the existing pond backwall. Also, compaction of soft material around outcrops will probably have m be done by hand, rather than by a vibratory roller. Pond Liner Installation What will be the required minimum compacted thickness of the minus 3/8" material m lx compacted by the vilsrBtAry roller? Is there an industry-standard set of specifications for the lap-joint welding and testing? If so, please identify; if not please specify requirements. What is the requited minimum engagement of the liner and anchor trench? P. 4