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Mater Dei High School October 20, 2023 Proposed Dance Studio, Santa Ana, California Project No. 3204.I 3204-I-01R (10/23) 14 effective sealing of joints and edges (particularly at pipe penetrations), as well as excess moisture in the concrete. The manufacturer of the floor coverings should be consulted for establishing acceptable criteria for the condition of floor surface prior to placing moisture- sensitive floor coverings. For elastic design of slabs-on-grade supporting sustained concentrated loads, a modulus of subgrade reaction (k) of 120 pounds per cubic inch (pounds per square inch per inch of deflection) may be used for on-site soils. The structural design should consider both long-term loads related to building operations and short-term construction loads. 4.6 CORROSIVITY Resistivity testing of a representative sample of the on-site soils indicates that they are severely corrosive to buried metals. GPI does not practice corrosion protection engineering. If buried metal pipe is to be used, a corrosion engineer, such as Project X, should be consulted. 4.7 SURFACE DRAINAGE Positive surface gradients should be provided adjacent to structures so as to direct surface water run-off and roof drainage away from foundations and slabs toward suitable discharge facilities. Long-term ponding of surface water should not be allowed on pavements or adjacent to buildings. 4.8 EXTERIOR CONCRETE AND MASONRY FLATWORK Exterior concrete and masonry flatwork should be supported on imported non-expansive, granular compacted fill. The use of clayey soils, if encountered, is not recommended within 2-feet of the flatwork subgrade. Prior to placement of concrete, the subgrade should be prepared as recommended in “Subgrade Preparation” section. 4.9 STORMWATER INFILTRATION Stormwater infiltration at the site is not feasible for several reasons. The soils observed in the upper 10 feet consist of silts and clays, which exhibit inadequate infiltration rates. Existing groundwater levels were encountered at depths of 9 feet below existing grades. Historical high groundwater has been determined at a depth of 5 feet below existing grades. Therefore, we recommend that on-site infiltration be avoided. 4.10 PAVED AREAS Preliminary pavement design has been based on an assumed R-value of 10, which is consistent with the on-site soils near the ground surface. The California Division of Highways Design Method was used for design of the recommended preliminary pavement sections. These recommendations are based on the assumption that the pavement subgrades will consist of the existing silty sand soils encountered near the ground surface. The subgrade soil conditions will need to be confirmed at the conclusion of rough grading with R-value testing. 1202 W Edinger Ave10/3/2024