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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 6l43J002 Project Portland Flume Reconstruction contractor can best take advantage of his equipment, personnel, experience and knowledge which should result in the most econo- mical solution. In general. temporary supports or permanent underpinning systems will be required for any foundations intersecting a line drawn upward at a slope of 1:1 from the bottom of the flume excavation. This can be modified somewhat if relatively rigid lateral support of the excavation walls is provided, Foundations for temporary shoring and/or permanent underpinning systems should be designed to bear below the theoretical 1:1 line with a minimum depth of 4 feet below lowest adjacent finished grade for permanent elements, and should be sized based on a maximum allowable bearing capacity of 3000 psf, General comments on individual structures are included included hereinafter: Structure No. IP - (Sta. 24 + 03): This structure appears to be in an unstable condition based on the temporary cable support pre- sently being used, Both temporary and permanent support may be necessary and several methods appear feasible, Structure No, 2P - (Sta. 16 + 20): The alignment for the new flume will be shifted slightly to the north in this area. If the existing flume wall is left in place, it does not appear that add- itional support will be required. If construction activities dis- turbed this area, temporary support in the form of isolated pits near the corners in conjunction with a carrier beam along the north wall may be necessary. Structure No, 3P - (Sta. 15 + 10): The alignment for the new flume will be shifted slightly to the north in this area also. Based on the distance from the new alignment, it does not appear -11- @