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Soil Suitability/ Nitrate Loading Study Addendum Letter Irerracon Proposed Global Carrier Inc. ■ Manteca, California July 24, 2019 ■ Terracon Project No. NA187034 Conclusions regarding the feasibility and reuse of the existing septic system for the future trucking facility could not be determined due to the unknown age, size, and condition of the existing septic system. Given the existing septic system was presumably installed prior to 1971, Terracon recommends the septic system should be evaluated by the EHD prior to continued use. Any new septic system construction should follow the San Joaquin County OWTS where applicable. If the existing septic system and groundwater production wells are no longer to be used on the site, they should be properly abandoned in accordance with local regulatory guidelines. Any debris encountered during site development should be characterized and disposed in accordance with local, state, and federal regulations. Limitations Our study takes into account the subject property only with the sewage load applied over the property site area. The study does not take into account surrounding properties and/or lands. The method utilized for the nitrate loading analysis is based on a simple mass balance formula, discussed in a published article by Hantzsche and Finnemore (1992), which provides a convenient and simplified method to estimate long-term groundwater nitrate impacts on an area- wide basis. A more detailed analysis was not requested nor intended. Our professional services were performed, our findings obtained, and our conclusions proposed in accordance with generally accepted engineering principles and practices. This warranty is in lieu of all other warranties either expressed or implied. Test findings and statements of professional opinion do not constitute a guarantee or warranty, expressed or implied. Responsive ■ Resourceful ■ Reliable 4