5306 W McFadden Ave - Plan - Laserfiche WebLink

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St. Barbara Catholic School Project No.: D-6289-01 CITY OF SANTA ANA Planning and Building Agency may, lS. Approved FOR PERMIT ISSUANCE to potential subgrade deflection and distress. It is recommended that these concrete elements be a minimum of 6 inches thick, reinforced with #3 bars at 12 i&fit%, : center Date: and placed over 6 inches of crushed rock. Subgrade for these areas sho ld be treated as mentioned in the subgrade section of our report, providing expansion joints 6 feet or less. For fire lanes, a pavement section of 6" concrete reinforced with #3 bars at 12" o.c. both ways, over 8" aggregate base compacted to 95% is suitable. A concrete strength of 3,000 psi is acceptable. Expansion joints can be placed at 10 feet o.c. max. Corrosion Potential 1. Chemical tests show low soluble sulfate content; however, it is recommended that all foundation or concrete slabs in contact with the soil use Type II Portland cement. Concrete should have a minimum compression strength of 4,000 psi and a maximum water/cement ratio of 0.50. 2. Based on preliminary soil resistivity analysis showing moderately corrosive to ferrous metals, minor corrosion of buried metallic pipe may be anticipated. Ferrous conduits exposed to the soil will generally tend to corrode; therefore, precautions such as wrappings and/or coatings are recommended to assure adequate service life. Surface Drainage It is recommended to provide positive surface drainage systems consisting of a combination of sloped concrete flatwork, sheet flow gradients, swales, surface area drains (where needed) around the building structure and direct all surface water to the appropriate drainage outlet. Ground surfaces should have at a minimum gradient of 2 percent away from building foundations and similar structures. Surface waters should not be allowed to collect or pond against building foundations and within the level areas of the site. 24