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HomeMy WebLinkAbout20180398E003_Renton_ES_16_2022-05-24_FR_012 Kirkland | Tacoma | Mount Vernon 425-827-7701| www.aesgeo.com Date Mailed: Principal / PM: This document is considered a DRAFT until signed or initialed by an AESI Principal or Project Manager Page 1 of 3 v.7.20 FIELD REPORT Date Project Name Project No. Report No. 05/24/2022 Renton Elementary School 16 20180398E003 012 Location Municipality AESI Project Manager AESI Field Rep 1075 Duvall Ave NE Renton Bruce Guenzler, L.E.G. Kelsey McCrady Permit No. Client/Owner Attn Requested By Renton School District No. 403 Ed Thomson Client Engineer/Architect General Contractor Grading Contractor Weather LPD / Hutteball + Oremus Cornerstone Continental Dirt Contractors/ Jerry Jr. Partly cloudy, 50’s THE FOLLOWING WAS NOTED: Associated Earth Sciences Inc. (AESI) was on site, as requested, to observe building footing subgrade preparation. Upon arrival, we met with representatives from Cornerstone and Continental Dirt Contractors (CDC). Building Footing Subgrade Preparation: Upon arrival, CDC was preparing footings in Area A for the future school building. At planned footing subgrade elevation, a moist to very moist, gray to orange, sand with silt (native till) was observed. AESI probed footing subgrades to depths of less than 2 inches and noted the material appeared firm and unyielding underfoot. The contractor then placed 4-inches of 2.5-inch minus crushed rock along the bottom of excavations to protect the subgrade. The material was compacted using a vibratory sled compactor. All footings observed today appear suitable for the design loads. See Figure 1 for locations. Building Foundation Subgrade Preparation: While onsite, CDC was continuing preparation of the future building pad subgrade south/southwest of Wetland B. In the area work was performed today, soil and current ground surface elevation consisted of a very moist to wet, dark brown, silty fine sand with occasional organics. Using a ½ diameter steel soils T-probe, this material probed between 1 and 2 feet. While onsite, AESI observed as the contractor removed the soft soils in an area approximately 30-feet wide by 80-feet long with depths that ranged from approximately 1 to 2.5-feet deep. The contractor excavated in the area until hard native till was exposed. AESI probed the moist, gray, sand with silt native till to depths of less than 2 inches and noted the material appeared firm and unyielding underfoot. The contractor then backfilled the area using 2.5-inch minus crushed rock material in 1-foot thick lifts. Each lift was compacted using a vibratory roller. While onsite today, AESI observed the contractor remove approximately 150 cubic yards of soft soils (bank yardage). See Figure 2 for location. Date Project Name Project No. Report No. 05/24/2022 Renton ES 16 20180398E003 012 Page 2 of 3 FIELD REPORT Figure 1: Footing subgrades observed today highlighted in green. Subgrades observed previously highlighted in blue. Figure 2: Approximate location of subgrade over excavation outlined in blue. Date Project Name Project No. Report No. 05/24/2022 Renton ES 16 20180398E003 012 Page 3 of 3 FIELD REPORT Photo 1: Overexcavation under future building pad as observed today. Photo faces north.