3410 TERMINAL AVE 2018-03-09 - Laserfiche WebLink

SHANNON WILSON,INC. • Additional piles are being added midpoint between each pile bents 27 through ' 35 along rows B through G. The planned new piles consist of a mix of 18-and 24-inch closed-end steel pipe piles. These piles are being added to upgrade the wharf for higher vertical load capacity. ' • Existing piles for the wharf consist of a mix of 24-inch hollow and 18-inch solid octagonal,prestressed concrete piles. Existing as-built drawings (prepared for Weyerhaeuser company) indicating pile size, length, and allowable capacity were provided to us by MN. Although the pile schedule on sheet S103 indicates that 20- inch piles were driven on row D, the actual piles along this row, as indicated by sheet S 104, are 24 inch piles. 3.0 GEOTECHNICAL EXPLORATIONS One geotechnical boring was drilled to characterize the subsurface soil and groundwater ' conditions beneath the wharf. The boring was completed on the land side of the wharf above the mean higher high water mark. For permitting reasons, we were not able to drill a boring along , the outboard edge of the wharf The approximate location of the boring is shown in Figure 2. 3.1 Geotechnical Borings The single boring(boring SW-1) completed on June 2, 2014,by Holocene Drilling Inc. of Puyallup,Washington,using a truck-mounted drill rig. Drilling was conducted under subcontract to Shannon&Wilson, Inc. A representative from Shannon&Wilson,Inc. was present during the field exploration periods to observe the drilling and sampling operations, retrieve representative soil samples for subsequent laboratory testing, and to prepare descriptive field logs. The samples were placed in jars and returned to our laboratory for further testing. The borings were drilled using hollow-stem auger(HSA)for the top 20 feet followed by mud rotary(MR) drilling techniques for the remainder of the boring. The HSA portion of drilling 111consisted of using continuous-flight augers to advance the boring and to remove soil from the borehole. Samples were obtained by removing the center bit and lowering a sampler through the auger. The MR portion of drilling consisted of using a tri-cone bit to advance drill rods. Drilling 1 mud, typically a mixture of bentonite powder and water,was circulated through the rods to remove soil from the borehole. Samples were obtained by lowering a sampler through the upper auger supported hole and the open hole below. The boring log for this project is presented in Figure A-2 (Appendix A). A boring log is a written record of the subsurface conditions encountered in the boring. It graphically shows the geologic units (layers) encountered in the boring and the Unified Soil Classification System I 21-1-21962-003-R2.docx/wp/cp 21-1-21962-003 2 I