Except for primary containment of hazardous materials@ this code provides minimum requirements for the design and construction of reinforced concrete structural elements of any environmental engineering concrete structure@ erected under the requirements of the legally adopted building code of which this code forms a part. In areas without a legally adopted building code@ this code defines minimum acceptable standards of design and construction practice.Environmental engineering concrete structures are defined as concrete structures intended for conveying@ storing@ or treating water@ wastewater@ or other non-hazardous liquids@ and for secondary containment of hazardous liquids. Other than circular tanks@ precast environmental structures designed and constructed in accordance with ASTM or AWWA are not covered in this code.This code supplements the general building code and shall govern in all matters pertaining to design and construction of reinforced concrete structural elements of any environmental engineering concrete structure@ except wherever this code is in conflict with requirements in the legally adopted general building code.This code shall govern in all matters pertaining to design@ construction@ and material properties wherever this code is in conflict with requirements contained in other standards referenced in this code.The provisions of this code shall govern for tanks@ reservoirs@ and other reinforced concrete elements of any environmental engineering concrete structure.This code does not govern design and installation of portions of concrete piles and drilled piers embedded in ground.This code governs the design and construction of soil-supported slabs as required by Appendix G. Slabs that transmit vertical loads from other portions of the structure to the soil shall meet the requirements of other chapters of this code as applicable.Concrete on steel form deckDesign and construction of structural concrete slabs cast on stay-in-place@ noncomposite steel form deck are governed by this code.This code does not govern the design of structural concrete slabs cast on stay-in-place@ composite steel form deck. Concrete used in the construction of such slabs shall be governed by Parts 1@ 2@ and 3 of this code@ where applicable.Special provisions for earthquake resistanceIn regions of low seismic risk@ provisions of Chapter 21 shall be satisfied. See 21.2.1.In regions of moderate or high seismic risk@ provisions of Chapter 21 shall be satisfied. See 21.2.1.Seismic risk level of a region shall be regulated by the legally adopted general building code of which this code forms a part@ or determined by local authority.For prestressed concrete environmental structures@ Chapter 1 through Chapter 21 cover prestressing in general. Chapter 1 through Chapter 21 plus Appendix F cover the use of circular wire and strand wrapped prestressed concrete environmental structures.