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City of Santa Ana 7-Eleven Convenience Store and Service Station Project Mitigation Monitoring and Reporting Program FirstCarbon Solutions 4 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 depth of 8 inches, and moisture conditioned to within 0 to 4 percentage points above the optimum moisture content. Hardscape subgrade shall be compacted to at least 90 percent relative compaction. Pavement subgrade shall be compacted to at least 95 percent relative compaction. • Field Observation: The Geotechnical Engineer shall check the bottom of excavations. If soft, loose, wet, or otherwise unsuitable soils are encountered, the depth of removal may be extended, or additional recommendations can be provided. • Fill Placement and Compaction: Excavated materials determined by the Geotechnical Engineer to be satisfactory can be reused as compacted fill. With the exception of the asphalt and concrete, it is anticipated that the majority of the excavated materials can be re-used as compacted fill soils. The asphalt grinding’s may be reused in non-building areas provided they are broken down to less 3 inches and thoroughly mixed with other materials. The existing concrete pavement on the site may be reused within the compacted fill provided all debris such as rebar is removed and the concrete is broken down or crushed to a maximum 3-inch size. The concrete pieces shall be thoroughly mixed with finer soil such that nesting of coarse fragments which could result in voids does not occur. The Geotechnical Engineer shall approve the fill material before placement. Fill shall be placed in 6- to 8-inch thick loose, horizontal lifts, moisture conditioned to within 0 to 4 percentage points above the optimum moisture content, and compacted to at least 95 percent relative compaction. The maximum dry density and optimum moisture content for the evaluation of relative compaction shall be determined in accordance with ASTM D1557. 1-18