Earthwork at Nalley Valley raises reader’s curiosityApril 22nd, 2013 by travis baker
The in basket: Bruce Fields of Bremerton e-mailed to say, “I drive by the I-5/Highway 16/38th Street project in Tacoma each day. A few weeks ago they built up the north landing for the new bridge section, put big blocks on top and marked it with survey stakes.
“A few days later they lowered the staked spot 30-plus feet and moved it southwest by about the same.
“Was this for compaction of the bank for the piling bore holes or did they make a mistake and had to relocate the ‘spot?’”he asked.
The out basket: Claudia Bingham-Baker of the Olympic Region of state highways says “What the driver is seeing is a ‘pre-load’ of weight to purposefully compact the ground in that area.
“The pre-load material has been on-site for about two weeks, and twice daily surveyors have checked for settlement. Once the area settles to our geotechnical engineers’ satisfaction, the material will be removed,” she said.