933 S Harmon St Unit #2 - Plan - Laserfiche WebLink

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CITY OF SANTA ANA Planning and Building Agency April 16, 2025 Project N umber 25129-25 Page 9 Approved FOR PERMIT ISSUANCE All walls shall be waterproofed as needed and protected from hydrostatic pre sure by a reliable permanent subdrain system. The subsurface drainage system shall consist oll*imahl [diameter perforated PVC pipe encased with gravel and wrapped with filter fabric. The rahUar backfill to be utilized immediately adjacent to retaining walls shall consist of an approved granular soil with a sand equivalency greater than 30. This backfill zone of free draining material shall consist of a wedge beginning a minimum of one horizontal foot from the base of the wall extending upward at an inclination of no less than 3% to 1 (horizontal to vertical). 7.7 Slab Design All new concrete slabs including hardscape shall be a minimum of four inches in thickness and placed on approved subgrade soils. The subgrade soils shall be moisture conditioned over optimum moisture levels in the upper one foot. A vapor retarder should be utilized in areas which would be sensitive to the infiltration of moisture. This retarder shall meet requirements of ASTM E 96, Water Vapor Transmission of Materials and ASTM E 1745, Standard Specification for Water Vapor Retarders used in Contact with Soil or Granular Fill Under Concrete Slabs. The vapor retarder shall be installed in accordance with procedures stated in ASTM E 1643, Standard practice for Installation of Water Vapor Retarders used in Contact with Earth or Granular Fill Under Concrete Slabs. The moisture retarder may be placed directly upon compacted subgrade soils conditioned to near optimum moisture levels, although one to two inches of sand beneath the membrane is desirable. The subgrade upon which the retarder is placed shall be smooth and free of rocks, gravel or other protrusions which may damage the retarder. Use of sand above the retarder is under the purview of the structural engineer; if sand is used over the retarder, it should be placed in a dry condition. 7.8 Utility Trench and Excavation Backfill Trenches from installation of utility lines and other excavations may be backfilled with on -site soils or approved imported soils compacted to a minimum of 90% relative compaction. All utility lines shall be properly bedded with clean sand having a sand equivalency rating of 30 or more. This bedding material shall be thoroughly water jetted around the pipe structure prior to placement of compacted backfill soils. NorCal Engineering