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HomeMy WebLinkAbout20180398E003_Renton_ES_16_2022-11-09FR_068 Kirkland | Tacoma | Mount Vernon 425-827-7701| www.aesgeo.com Date Mailed: Principal / PM: Bruce Guenzler, L.G., L.E.G. 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. 11/9/2022 Renton Elementary School 16 20180398E003 068 Location Municipality AESI Project Manager AESI Field Rep 1075 Duvall Ave NE Renton Bruce Guenzler, L.E.G. Brendan Young Permit No. Client/Owner Attn Requested By B21004604 Renton School District No. 403 Ed Thomson Contractor Engineer/Architect General Contractor Grading Contractor Weather CPL / Hutteball + Oremus Cornerstone/Kyle Continental Dirt Contractors/ Jerry Jr. Sunny, 80’s THE FOLLOWING WAS NOTED: Associated Earth Sciences Inc. (AESI) was on-site in the afternoon at the request of the general contractor to observe soil conditions associate with the southern parking lot and adjacent curb subgrades. At the time of our arrival we met with representatives from both Cornerstone and Continental Dirt. Parking Lot and Curb Subgrades (South Lot): At the time of our arrival the earthwork contractor was in the process of grading for curbs in the southern parking lot. It was observed that portions of the southern parking lot had large ruts/tire marks where wet, yielding soil was found. AESI was asked to probe curb subgrades for bearing pressure. AESI utilized a ½” diameter steel soils probe to probe the exposed curb subgrade, the curb subgrade was composed of a brown silty sand and gravel which had been previously placed and compacted over the storm water tanks below. Probe penetration depths reached up to 3 feet under the full weight of the observer in places (See Figure 1), Probe penetration depths around previously installed light pole bases also reached depths of 3 feet. AESI observed that in some areas where probe depths did not exceed 2” that the soil directly below was yielding when the firm soil above was removed, this is an indication that the extent of the yielding soil may extend beyond the areas highlighted in Figure 1. AESI observed an exploratory exploration in the exposed curb subgrade, approximately 2.5 to 3 feet of material was removed before encountering the previously placed filter fabric over the storm water tank rock fill. The extent of the yielding soil may extend beyond the area shown in Figure 1 however at the time of our visit the area obscured by parked cars and previously placed crushed aggregate. AESI observed the earthwork contractor drive a backhoe across the southern parking lot, soil was observed to be pumping under the weight of the tires in the southern parking lot. AESI informed the contractor that a portion of the yielding fill appeared to follow electrical conduits that were previously installed while other areas appeared to be wet fill previously placed when the storm water tanks were backfilled. The areas where yielding soil was observed today are shown in Figure 1, it was the opinion of AESI that the material was not in a firm and unyielding condition and was not suitable for pavement or curbs at this time. The contractor informed AESI that they would begin remediation of the soils with removal and replacement with imported fill material as soon as possible. The contractor will remain in contact with AESI for the purpose of scheduling future site visits. 16 Date Project Name Project No. Report No. 11/9/2022 Renton ES 16 20180398E003 068 Page 2 of 3 FIELD REPORT Figure 1: Location where yielding soil was observed at the time of our visit, in most areas shown in red soil probe penetration depths exceeded 2.5 under the full weight of the observer. 16 Date Project Name Project No. Report No. 11/9/2022 Renton ES 16 20180398E003 068 Page 3 of 3 FIELD REPORT Figure 2: Yielding soil observed within the area being prepared for curb. The area was yielding under foot and probe depths reached up to 3’ Figure 3: Explroatory excavation to observe soil conditions, soil was wet and yielding, 3 feet of material was removed to expose the filter fabric used above the storm tanks.