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I I I I I I I I I I I I I I I I I I I Simons, Li and Associates, Inc. Job Number 6143J002 Project Portland Flume Reconstruction that temporary support will be required for this structure if con- struction activities remain within the new alignment. Structure No. 4P - (Sta. 12 + 05): Due to the depth of the exist- ing basement footing and the distance from the new construction, it does not appear that temporary support will be required for the main structure. However, some wooden steps at the northeast cor- ner of the house are located immediately adjacent to the flume wall, and probably will require temporary support during construc- tion, Structure No. 5P - (Sta. 11 + 37): It does not appear that this structure will require temporary support, However, due to the relatively heavy foundation loading of this building, it should be monitored closely during construction, It appears that inclined bracing or pit underpinning would be feasible for this structure. Structure No. 6P - (Sta, 8 + 94): It appears that the alignment of the flume will be shifted approximately 4 feet north and deep- ened approximately 5 feet at this location, It appears that this structure will require temporary support and possibly some type of permanent underpinning, particularly along the west end, due to the deepening of the flume at this location. Several methods appear to be feasible for this structure. The concrete and stone basement/stem wall will probably require some lateral support. Structure No. 7P - (Sta, 8 + 14): It appears that the alignment of the flume will be shifted approximately 4 feet north and deep- ened approximately 4 feet at this location, Due to the shallow stone footing present under this structure, it appears that tem- porary support will be required, It is doubtful that the stone foundation will clear span any reasonable distance, .therefore, some type of carrier beam will probably be required. -12- @