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March 09, 2023 <br />Samira Sanaee <br />KB Racking <br />1050 King St. W., Suite 03A104 <br />Toronto, Ontario M6K 0C7 <br />Re: Foster Printing - PV Ballast <br />700 East Alton Ave. <br /> Santa Ana, CA 92705 <br />EEI Proj. No.: 23-03-079 <br />Samira, <br />As requested, we have reviewed the solar array layout and ballasting requirement calculations prepared by KB <br />Racking for the above-noted project. The purpose of our review is to verify the adequacy of the ballasting <br />requirements specified by KB Racking to withstand the wind forces of the region noted above. Our analysis <br />assumes that the product type for the solar array will be EkonoRack, by KB Racking, with array size, orientation, <br />and panel information as specified on Sheet S-1 of the plans prepared by KB Racking. Design wind drag-force <br />coefficients for the EkonoRack system were determined by Rowan Williams Davies & Irwin, Inc. (RWDI) in <br />separate, third-party wind-tunnel testing and have been adapted for use in our analysis on this project. <br />The attached structural calculations are based on RWDI’s testing results, the plans prepared by KB Racking, and <br />the following design criteria: <br />Design Criteria: <br /> Building Jurisdiction: Santa Ana, CA <br /> Applicable Codes: 2022 Cal. Building Code, ASCE 7-16 <br /> Basic Wind Speed: 95 mph, Risk Cat. II, Exposure B <br /> Solar Modules: 89.21”x44.65” & 71.0lb for Canadian 540W Panels @ 5 degrees <br />Concluding our review, we find that the solar array ballast requirements shown on the calculations provided by <br />KB Racking are adequate to support the required loading of the above noted building jurisdiction. Eclipse <br />Engineering, P.C. has reviewed the ballast requirements for the new solar array only, therefore, we do not take <br />responsibility for any other portion of the structure, structural members not covered within this report, nor the <br />integrity of the structure as a whole. Owner shall abide by ASCE 7-16 Section 13.6.12 for signage, roof markings, <br />and allowable solar array movement in accordance with the supporting calculations. <br />Sincerely, <br />Eclipse Engineering, Inc. <br />Brett Allen, P.E., Project Manager <br />Enclosed: Supporting Calculations; Plan set by KB Racking <br />03/09/2023 <br />Digitally signed by <br />Scott Ratterman <br />Date: 2023.03.09 <br />13:38:00-08'00' <br />700 E Alton Ave - <br />101114289 & <br />2017906306/06/23