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City of Santa Ana 7-Eleven Convenience Store and Service Station Project Mitigation Monitoring and Reporting Program FirstCarbon Solutions 10 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 to the vapor retarder/barrier during construction, and may assist in reducing the potential for edge curling in the slab during curing. However, the sand layer also provides a source of moisture to the underside of the slab that can increase the time required to reduce vapor emissions to limits acceptable for the type of floor covering placed on top of the slab. The slab can be placed directly on the vapor retarder/barrier. The floor covering manufacturer shall be contacted to determine the volume of moisture vapor allowable and any treatment needed to reduce moisture vapor emissions to acceptable limits for the particular type of floor covering installed. The project team shall determine the appropriate treatment for the specific application. - In addition to the moisture vapor barrier, a capillary moisture break shall be constructed below the slab to further reduce moisture transmission from the subgrade soil, if desired. The capillary moisture break shall consist of at least 4-inches of clean, free-draining gravel or crushed rock placed below the moisture vapor retarder/barrier. The components of the capillary moisture break shall meet the particle-size gradation presented in Table 3 of the Geotechnical Report. - Exterior Slab on Grade: The top 24 inches of material below exterior concrete slabs-on-grade shall have an expansion index of 20 or less determined in accordance with ASTM D4829 or a Plasticity Index less than 15. Exterior slabs shall have a minimum thickness of 4 inches and be reinforced with at least No. 4 bars at 18 inches on center each way. Slabs shall be provided with weakened plane joints. Joints shall be placed in accordance with the American Concrete Institute (ACI) guidelines. The project architect shall select the final joint patterns. 1-24