Absher/Stellar J Joint Venture 12/8/2025 (3)

Port Gardner Storage Facility Volume 7 Attachment O Page 10 CITY OF EVERETT ⋅ 3200 Cedar Street ⋅ Everett, WA 98201 ⋅ (425) 257-8800 ⋅ Fax (425) 257-8882 Q48 – Sheet D-20-1002 shows the FA Piping transition from 12” to 8” with the remainder of the FA piping shown as 8”. There is another reduction shown after the first 8” tee. Does this signify that the remainder of the FA piping is to be 6”, and mis-labeled as 8” or is the reducer shown in error? There is an approximately 4-foot long section of 10" diameter FA piping between the transition from the 12" to 8" diameter piping shown on Drawing D-20-1002. The first reducer is from 12" to 10" located approximately at gridline D6. The next downstream reducer is 10" to 8" diameter. 8" is the smallest diameter FA piping within Area 20. Q49 – Specification 31 32 33 – Is ground improvement required through the wood debris for static/seismic stability of the project? Wood debris is not admissible to cement-mixing. Contractor is concerned with the risk of not achieving strength through the wood layer that may require full cased excavation and backfill with concrete – extremely more expensive. Furthermore, grout can escape through the wood layer and run off the face of the slope contaminating the shoreline. Can grouting stop below the wood layer? HWA assumes that ground improvement may be required through the wood debris for static/pseudostatic stability; however, the Contractor’s ground improvement design must demonstrate that the performance criteria and design requirements in the specifications (e.g., static/pseudostatic stability, etc.) will be achieved, whichever grouting configuration is proposed. HWA understands the difficulty of implementing ground improvement within the variable woody debris soils; hence, the requirement for a ground improvement test section adjacent to the production ground improvement area to verify Contractor’s proposed ground improvement design and methods. Per the Quality Assurance and Test Program requirements, the Contractor shall prove through sampling and testing that the proposed equipment, procedures, and mix design can uniformly mix the in situ soils and can achieve required strengths. Q50 – Specification 31 32 33 – Can you provide more explanation about the wood debris? Is it peat, saw dust, branches or timber? Can the Engineer provide photos of the extracted materials? The wood debris encountered in the explorations is highly variable, consisting of wood fibers, wood chips, sawdust, and sands/silts mixed with variable woody debris content (as described in the boring logs in the geotechnical report). Organic content tests were performed on select samples and the results are also included on the boring logs. Q51 – With reference to spec section 00 21 13-5, 1-02.4(1) 4, Responsible bidders must base their bid on information provided by the City or Engineer related to site conditions. Please confirm that the City will remain responsible for subsurface conditions not identified in the contract documents.