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HomeMy WebLinkAbout20180398E003 Renton ES 16 2022-06-28 FR 031 (1) 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 2 v.7.20 FIELD REPORT Date Project Name Project No. Report No. 06/28/2022 Renton Elementary School 16 20180398E003 031 Location Municipality AESI Project Manager AESI Field Rep 1075 Duvall Ave NE Renton Bruce Guenzler, L.E.G. Zach Brodkey Permit No. Client/Owner Attn Requested By B21004604 Renton School District No. 403 Ed Thomson Client Engineer/Architect General Contractor Grading Contractor Weather CPL / Hutteball + Oremus Cornerstone/Kyle Continental Dirt Contractors/ Jerry Jr. Cloudy, 60’s THE FOLLOWING WAS NOTED: AESI arrived on site mid-morning as requested by Continental Dirt Contractors (CDC) to observe the drying and filling process in the North grading area (Figure 1), observe the excavation and fill of the water main trench in the Northern portion of the bus loop road, as well as electrical and indoor plumbing fill (MEPs). Grading North: CDC continued to pull wetter than optimum native soil from the stockpile (Figure 1), lay it down over the grading area in roughly 1- foot lifts, till it and turn it over for aeration with the disc roller, scrape it with the dozer, and recompact it with the smooth drum vibratory roller. We observed progress throughout the day and observed that each lift appeared firm and unyielding and adequtately compacted before adding the next lift. One lift was completed and covered today, an a second was placed and continues to aerate. Cloudy and slightly wet weather resulted in slow aeration progress. Plumbing-Electrical Conduits: Most of the trenches for the plumbing and electrical lines are shallow (less than 1 foot) and were excavated in the building pad rock (2.5” minus crushed rock). AESI made visual and probe observations at random locations. Subfloor electric and plumbing backfill of about 6 inches of 2.5” minus crushed rock was observed in section A of the building and was firm and unyielding in our opinion. The large bundle of electrical conduits seen last week running North-South through the middle of the building footprint was observed to have some loose backfill and subgrades which was brought up to Jason of SARE who agreed to replace and/or recompact it if need be when the backfilling is done (estimated to be done on 7/7). We also observed Doug (plumbing excavation and backfill) excavating a new trench through the rock pad, which we probed the bottom of to observe that it was firm and unyielding. Water Main Trench Backfill Just after 2pm the CDC crew were able to begin backfill of the North/Northeast portion of the water main trench after the city inspector approved the fire loop water tie-in. The water main runs under the Northern portion of the bus loop road, and most of what was excavated was backfilled to subgrade on this day. The pipe bed was roughly 7 feet below the final grade at its deepest near the water main tie-in, and got shallower going down such that the depth is 5 feet beneath final grade for the rest of the water main trench (the portion going straight North-South). The bottom of the trench was observed to be firm and unyielding native soil (till). 7/8” minus crushed rock was used as pipe bedding, roughly 2 feet deep around the water main pipe. Then the mix of native soil and crushed rock excavated from the trench was backfilled in several small lifts compacted with the hoepac. Density tests were obtained at 4 feet below final subgrade (3 feet above pipe bed), 2 feet below final subgrade, 1 foot below final subgrade, and at subgrade. The results for these density tests are in Table 1. The trench will be excavated and backfilled moving South tomorrow. 6 Date Project Name Project No. Report No. 06/28/2022 Renton ES 16 20180398E003 031 Page 2 of 2 FIELD REPORT Table 1: Density Test Results Test No. Location Depth from current grade (ft) Proctor (ASTM D1557) Dry Density (pcf) Moisture % Compaction % Pass/Fail 1 See Figure 1 4 133.5/8% 127.7 8 96 Pass 2 See Figure 1 2 133.5/8% 130.8 7 98 Pass 3 See Figure 1 1 133.5/8% 127.3 9.8 95 Pass 4 See Figure 1 0 133.5/8% 127.8 6.4 96 Pass Figure 1: Layout of Earthworks Across ES16 Site