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EXH 385: HartCrowser Calculations — 3R Wall Alternative Selection, S+W Peer Review

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Sea-Tac Airport
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This is a HartCrowser engineering calculations document dated 3/16/99, related to a '3R Wall Alternative Selection Process' peer review. It contains technical notes on retaining wall construction considerations, including settlement allowances, corrosion rates, MSE (Mechanically Stabilized Earth) wall facing under seismic conditions, geosynthetic material quality checks, and construction contingencies. The document also outlines action items including verbal records, memos, and specifications on plumbness and connections, with a meeting scheduled for the following week.

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Exhibit 385 (AR021698), HartCrowser calculations document dated 3/16/99, Job No. 4978-01, prepared by JRB for S+W peer review of 3R Wall Alternative Selection Process. Notes cover Mechanically Stabilized Earth (MSE) wall selection, wall versus slope considerations, settlements before facing placement, FHWA corrosion rates (Holtz), trench-type excavation, stone columns for foundation improvement, 1978 MSE facing publication, seismic interaction with concrete panels and fill, dilation angle assumption, wall deflections, chemical degradation of polymers under stress, geosynthetic quality, construction contingencies, granular material excavation in wet conditions, test fills and instrumentation. Action items include S+W verbal recs, memo from S+W, specifications on plumbness/connections/hats, and a 1:30pm meeting next week. Filed under PCHB third-runway-eis administrative record.

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