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aggregate base and subgrade should be Drooerly compacted to a mininrum of- 959/o an<l 9rtJ9t. <br />respectively, of the maximum density determined in accordance with ASTM D I 557 prior to <br />placement of the concrete slab. Spraying the compacted subgrade soils with water should be <br />perlormed prior to concrete pour. <br />Ifrequired. a permeable driveway covered with pavers can be used. <br />Site Drainaqe <br />In general. surface drainage at the site should be checked and improved. as needed, to ensure <br />surf'ace water flows away f'rom all improvement structures and into a drainage system for proper <br />discharge. <br />Irrigation at lhe site. if any. should be kept to a minimum required to support plant lit'e <br />ln the future. sources of uncontrolled water, such as leaky sewer, water (domestic, irrigation) or <br />drain pipes should be repaired if identified. <br />The requirements of the govemmental agency and the current CBC should be followed, as <br />needed. <br />We recommend the proposed new structure be designed to meet the current building codes and <br />requirements of the governing agency. The seismic parameters provided in the "Faulting and <br />Seismicity" section of this report can be used. The c iv il/structural design engineer should consult <br />with the project geotechnical consultant, if additional geotechnical information is needed for the <br />seismic design. <br />Cement Tvpe For Concrete in Contact with On-Site Earth Materials <br />Sulfate attack was not observed for the existing building at the site and other buildings in the <br />vicinity. It appears sulfate attack on concrete is not a problem for the entire City oi Santa Ana. <br />Therefbre. Type V cement with a maximum water/cement ratio o10.45 and a minimum concrete <br />strength. l. of 4,500 psi is not considered necessary. Concrete strength designed by the <br />c iv illstructural design engineer such as 2,500 psi can be used. lf required, sulfate content tesling <br />can be performed for the final subgrade soils after completion of the precise grading/site <br />preparation but prior to concrete pour. Based on the results of sulfate content test. modification <br />ofour recommendations would be performed. as needed. <br />Corrosion'fo Ferrous Metals and Copper <br />For conservative purposes. the on-site soils can be considered severely corrosive to ferrous <br />metals and copper. Underground/buried ferrous metals or coppcr are not planned to be used for <br />these project. However, if underground/buried ferrous metals or copper are planned to be used at <br />the site. they should be properly protected. A corrosion specialist can be consulted. Testing can <br />Page 7 <br />Roofgutters and downspouts should be properly provided and maintained. <br />Seismic Desien