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<br /> <br />August 28, 2020 <br />Unirac, Inc. <br />1411 Broadway Boulevard NE <br />Albuquerque, New Mexico 87102-1545 <br />TEL: (505) 242-6411 <br />FAX: (505) 242-6512 <br />Attn: Engineering Services <br />Re: Engineering Certification for the Unirac Large Array (ULA) Photovoltaic Panel Support System <br />The Unirac Large Array (ULA) photovoltaic panel support system is a proprietary ground mounted system which supports <br />photovoltaic panels. <br />Structural design is determined using the internal design tool developed by Unirac and covers a wide range of loading <br />conditions and array sizes and allows the user to customize the input to match the specific project conditions. <br />We have reviewed the ULA photovoltaic panel support system methodology and U-builder tool and have determined that <br />the design methodology is a rational approach and is in compliance with the structural requirements of the following <br />Reference Documents: <br />Codes: <br />o ASCE/SEI 7-05, 7-10 and 7-16 Minimum Design Loads for Buildings and Other Structures <br />o 2018 International Building Code, by International Code Council, Inc., 2018 <br />o 2019 California Building Code, by California Building Standards Commission, 2019 <br />Other: <br />o 2015 Aluminum Design Manual, by The Aluminum Association, 2015 <br />o Specification for Structural Steel Buildings ANSI/AISC 360-10 <br />o UDM-0001 Unirac – Large Array (U-LA) Design Methodology, Revision 1 <br />This letter certifies that the ULA photovoltaic panel support system methodology and U-builder tool are in compliance <br />with the above Reference Documents. <br />If you have any questions on the above, do not hesitate to call. <br />Prepared by: <br />PZSE, Inc. - Structural Engineers <br />Roseville, CA <br />50 Sierra College Boulevard, Suite 150, Roseville, CA 95661 <br />T 916.961.3960 F 916.961.3965 W www.pzse.com <br />Experience | Integrity | Empowerment <br />1478 Stone Point Drive, Suite 190, Roseville, CA 95661 <br />T 916.961.3960 F 916.961.3965 W www.pzse.com <br />Experience | Integrity | Empowerment <br />REENI <br />IGER <br />LARUTCURTS AINROFILACFOETATS <br />GNELANOISSEFORPDERETSEHCAZHTENEKL <br />N <br />AP <br />Exp. 3-31-23 <br />No. S3878 <br />R <br />U <br />DIGITAL SIGNATURE <br />April 01, 2021 615 S <br />08/24/23