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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 />to the vapor retarder/barrier during construction, and may <br />assist in reducing the potential for edge curling in the slab <br />during curing. However, the sand layer also provides a <br />source of moisture to the underside of the slab that can <br />increase the time required to reduce vapor emissions to <br />limits acceptable for the type of floor covering placed on <br />top of the slab. The slab can be placed directly on the vapor <br />retarder/barrier. The floor covering manufacturer shall be <br />contacted to determine the volume of moisture vapor <br />allowable and any treatment needed to reduce moisture <br />vapor emissions to acceptable limits for the particular type <br />of floor covering installed. The project team shall determine <br />the appropriate treatment for the specific application. <br />In addition to the moisture vapor barrier, a capillary <br />moisture break shall be constructed below the slab to <br />further reduce moisture transmission from the subgrade <br />soil, if desired. The capillary moisture break shall consist of <br />at least 4-inches of clean, free -draining gravel or crushed <br />rock placed below the moisture vapor retarder/barrier. <br />The components of the capillary moisture break shall <br />meet the particle -size gradation presented in Table 3 of <br />the Geotechnical Report. <br />Exterior Slab on Grade: The top 24 inches of material <br />below exterior concrete slabs -on -grade shall have an <br />expansion index of 20 or less determined in accordance <br />with ASTM D4829 or a Plasticity Index less than 15. <br />Exterior slabs shall have a minimum thickness of 4 inches <br />and be reinforced with at least No. 4 bars at 18 inches on <br />center each way. Slabs shall be provided with weakened <br />plane joints. Joints shall be placed in accordance with the <br />American Concrete Institute (ACI) guidelines. The project <br />architect shall select the final joint patterns. <br />FirstCarbon Solutions <br />Y:\Publications\Client(PN-1N)\0327\03270041\MMRP\03270041 City of Santa Ana 7-Eleven MMRP.docx <br />Verification of Completion <br />Responsible for <br />Method of Verification Timing of Verification Verification Date Initial <br />10 <br />1-24 <br />