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City of Santa Ana 7-Eleven Convenience Store and Service Station Project Mitigation Monitoring and Reporting Program FirstCarbon Solutions 11 Y:\Publications\Client (PN-JN)\0327\03270041\MMRP\03270041 City of Santa Ana 7-Eleven MMRP.docx Table 1 (cont.): 7-Eleven Convenience Store and Service Station Project Mitigation Monitoring and Reporting Program Mitigation Measures Method of Verification Timing of Verification Responsible for Verification Verification of Completion Date Initial MM GEO-4: Underground Storage Tank Backfill • Backfilling adjacent to and over the top of the underground storage tanks shall be performed in accordance with the tank manufacturer’s specifications. Pea gravel used for tank backfill shall be encapsulated (“burrito wrapped”) in a geotextile fabric to prevent migration of fines into the voids within the pea gravel, which could cause ground settlement. The pea gravel backfill shall be covered with a structural concrete slab designed to bridge over localized settlement of the gravel backfill. - Depending on the actual quality and composition of the gravel utilized to backfill the USTs, little or no mechanical compactive effort is generally necessary to place the gravel in a dense manner. Review and approval of UST Installation Plan Prior to construction activities City of Santa Ana MM GEO-5: Pavement • Asphalt Concrete Pavement: An R-Value of 9 has been assumed for preliminary design of pavement sections based on laboratory test results and visual observation of the on-site material in the upper 5 feet. The actual R-value of the subgrade soils shall be determined after grading to provide final pavement design. Flexible pavement sections have been calculated in general conformance with Caltrans guidelines. The project civil engineer and owner shall review the pavement designations to determine appropriate locations for pavement thickness. Based on an assumed R-value of 9, the following pavement structural sections have been calculated (See Table 4 of the Geotechnical Report. - Prior to placing base materials, the upper 12 inches of the subgrade soil shall be scarified, moisture conditioned to slightly above the optimum moisture content, and recompacted to a dry density of at least 95 percent of the Conduct on-site inspections During construction activities City of Santa Ana 1-25