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