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OAC <br />subcontractors to verify assembly installation, details, and expectations. Field quality control <br />site visits meet the requirements of ESDS 7.13B Option #01 and RCW 64.55.050(1)(b). <br />o Any recommendations from a building enclosure perspective given to the Contractor were for <br />the Owner to review and install. OAC verified that all recommendations have been <br />addressed by either contractor confirmation, photo verification or follow-up site visits. <br />OAC performed field penetration water resistance testing of a representative sample of window and <br />sliding glass door assemblies (RCW 64.55.050(1)(a) and ESDS 7.13B Option #03). Testing was <br />performed in compliance with ASTM E 1105. All windows and sliding glass doors tested <br />subsequently passed — any failures during testing were remediated on -site and re -tested until pass. <br />OAC provided the necessary testing and reporting to meet the requirements set forth by ESDS 4.1 b <br />"Water Conserving Fixtures," and 7.5 "Ventilation." OAC verified the required sampling of water <br />fixtures and whole house fans met the requirements — all testing reports were submitted to the <br />Owner. <br />In our opinion, "Four Corners" Building E has been constructed, from a building enclosure <br />perspective, in conformance with the Evergreen Sustainable Development Standard, version 3.0, <br />requirements for Section 7.13 Enhanced Building Envelope Design and RCW 64.55.005 through <br />64.55.090. The work we observed has been performed in substantial compliance with the Building <br />Enclosure Design Documents within the architectural drawings and corresponding approved <br />Request for Information (RFI) and Architect's Supplemental Information (ASI) design changes <br />related to the building. There are no outstanding items on the OAC Field Reports. <br />We hope we have provided the information you need. If you have any questions, please do not <br />hesitate to contact our office. <br />Sincerely, <br />err May, AIA <br />Sr. Director— Building nclosure Design <br />OAC Services, Inc. <br />Cc: Mike Vaughan, Heartland Construction <br />Suzan Williams, Heartland Construction <br />Erin Jensen, Heartland Construction <br />FOUR CORNERS — BUILDING E I Building Enclosure Close-out Letter 12 <br />R 12-200117.00 <br />May 22, 2024 <br />