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<br />Mr. Clem Parkin -3- November 21, 1985 <br />4. Portal ~2 <br />The proposed dump adjacent to Portal ~2 is located in somewhat flatter <br />terrain, and is thus even less likely to exhibit slope movement than the pile <br />at Portal N1. The amount of materials to be dumped is 2000 cubic yards, also <br />somewhat less than at Portal N1. Again, the parameters given above suggest <br />that stability of the pile will not be a problem. It is again recommended <br />that the area be stripped of topsoil, and where possible surface water be <br />directed away from the face of the pile. Progressive reclamation is also <br />recommended. <br />5. Monitoring <br />It is recommended that monitoring be limited to occasional visual observation <br />of the crest and toe of the piles during their construction. If excessive <br />movements occur, the effects of these can be immediately mitigated by cleanup <br />or modification of the dumping schedule. Normal care should be taken in <br />dumping the materials, as it is possible that some movements of the structure <br />may occur, even in a material with the above favorable parameters. <br />6. Summary <br />In summary, it appears that the piles proposed will be stable, as a result of <br />the relatively strong foundation materials, the considerable depth to the <br />water table in the proposed dump area, and the expected good strength and <br />drainage of the piles themselves. If desired, the piles could be reclaimed in <br />place, and remain stable indefinitely. <br />I trust that this letter provides the additional information that you require. <br />Should there be any questions, please do not hesitate to call. <br />Respectfully submitted, <br />TERRA THERMA INC <br />adM~~~ <br />Adrian Brawn, P.E., Vice President <br />• Terra Therma Inc <br />