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LMJ Enterprises,LP. December 7,2023 Page 2 <br /> exposed subgrades using a 1/2-inch diameter steel probe rod and/or by observing a proof-roll using a loaded <br /> dump truck. Geoengineers also collected representative samples of onsite or import material intended to <br /> be used as backfill material to complete laboratory testing consisting of grain size distribution analyses and <br /> modified Proctor compaction tests. <br /> Structural fill placed within the building addition footprint generally consisted of imported material meeting <br /> the specifications of Washington State Department of Transportation (WSDOT) gravel borrow (sand with <br /> variable silt and gravel).Structural fill placed in hardscape areas generally consisted of recompacted onsite <br /> soils,WSDOT gravel borrow, or cement treated onsite soils.Structural fill placed in utility trenches generally <br /> consisted of WSDOT gravel borrow. <br /> We also observed placement and compaction of fill around the R-tank and detention vault. Backfill placed <br /> below and around the R-tank consisted of 11/4-inch clean crushed rock, however, the backfill surrounding <br /> the R-tank was enveloped in a non-woven geotextile. Backfill placed above the R-tank consisted of <br /> recompacted on-site soils (glacial till). <br /> Backfill was generally placed in 6 to 12-inch-thick loose lifts and compacted with a jumping jack, vibratory <br /> roller, or hoe-pack. Based on our observations, it is our opinion that fill placement and compaction were <br /> completed in general accordance with the project plans and specifications. <br /> Subgrade Evaluation <br /> We evaluated subgrade soils below foundations, the detention vault, R-tank, and pavement areas by <br /> probing with a 1/2-inch diameter steel probe rod and observing proof rolling. Subgrades below structures <br /> and the R-tank generally consisted of dense to very dense glacial till (sand with variable silt and gravel <br /> content). Pavement subgrade areas consisted of either medium dense to dense native glacial soils or <br /> suitably compacted structural fill. <br /> Based on our observations, it is our opinion that foundation, R-tank detention vault, and pavement <br /> subgrade preparation was completed in general accordance with the project plans and specifications. <br /> Foundation Drainage Installation <br /> We observed installation of subsurface drainage around the perimeter of the building.Subsurface drainage <br /> generally consisted of a 4-inch diameter perforated polyvinyl chloride(PVC) pipe in an 18-inch-wide zone of <br /> drainage rock wrapped in a non-woven geotextile separator. <br /> Based on our observations, it is our opinion that the subsurface drainage was completed in general <br /> accordance with the project plans and specifications. <br /> GEOENGINEERS� <br /> File No.24459-003-00 <br />