1313 75TH ST SW 2023-12-11 - Laserfiche WebLink

Tacoma Office PSE 708 Broadway Suite 110 PETERSON STRUCTURAL ENGINEERS Tacoma, WA 98402 253.830.2140 February 1, 2023 Paul Gentsch Helion Energy 141575 1h St SW Everett,WA 98203 425.495.4215 RE: Helion Energy Shielding Structure Foundation—Structural Observation Report Project#: 2202-0023 Structural Observation Number: 1— Foundation 100% Bottom Mat Reinforcing Observation Dear Paul, The following structural observation report has been generated based on our site visit performed at the Helion Energy facility (located at 1313 75th St SW, Everett, WA) on Tuesday, January 3151, 2023. The purpose of the observation was to review the foundation rebar at 100%completion of the bottom mat for general conformance with the contract documents. PSE arrived on site at approximately 12:00pm and met with Paul Gentsch of Helion Energy and Hayden Leblonde of Andersen Construction. Installation of the primary bottom slab bars had been completed except for some outstanding instances of pairs of#8 hooked bars at the slab perimeters. The iron workers had begun installing the rebar cages at the building footing locations which was in place at the NW slab corner and not yet installed at the other (3) exposed building column locations. PSE found the condition of the observable structural work to be in general conformance with the construction documents. However,the following items were noted to be out-of-compliance and require correction or as otherwise noted. 1. Action Item 1 (Resolved) — Issues with the bottom mat #11 bar lap splices not properly staggered per the plans were identified while on site.The discrepancy was communicated to Andersen Construction while on site and required re-placing the lap splices to satisfy the design drawings. See Figure 2. After discussion the day following the site visit, it was determined that adjacent splices for the Class B lap splices is acceptable and no adjustment is needed. 2. Action Item 2—The bent bar reinforcing at the shallow building column locations appeared to be set in place in orientations that did not reflect the design details.This was discussed with Andersen Construction while on site and some instances of the turned out or side-Iain bars were corrected. See Figure 3. Some outstanding instances of the bent bars not oriented vertically were still observed prior to leaving the site and should be corrected prior to placing the top mat. 3. Action Item 3—Instances of uneven bar spacings in the longitudinal direction were observed within the HSS stand template area. This was discussed with Andersen Construction while on site and minimum bar clearances should be maintained. No observed instances of insufficient bar clearances were observed, however the uneven spacings should be adjusted as much as possible to achieve the 10"typical c-c spacing. See Figure 4. OREGON I WASHINGTON I CALIFORNIA