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20.04.040 Conflicting provisions. When there is a conflict between a general requirement and a specific requirement, the specific requirement shall be applicable. Where, in any specific case, different sections of the technical codes specify different materials, methods of construction or other requirements, the most restrictive shall govern. When conflicting provisions or requirements occur between this code, the technical codes and other codes or laws, the Building and Safety Official shall determine which provision or requirement shall govern. 20.04.050 Alternate materials, methods of design and methods of construction. The provisions of the technical codes are not intended to prevent the use of any material, method of design or method of construction not specifically prescribed by the technical codes, provided an alternate has been approved and its use authorized by the Building and Safety Official, or for all occupancies regulated by the Fire code, the Fire Code Official. An alternative material, design or method of construction shall be approved where the Building and Safety Official or Fire Code Official finds that the proposed design is satisfactory and complies with the intent of the provisions of the technical codes, and that the material, method or work offered is, for the purpose intended, at least the equivalent of that prescribed in this code in suitability, strength, effectiveness, fire resistance, durability, safety and sanitation. The Building and Safety Official or Fire Code Official shall require that sufficient evidence or proof be submitted to substantiate claims that may be made regarding its use. Supporting data, where necessary to assist in the approval of materials or assemblies not specifically provided for in the technical codes, shall consist of valid research reports from approved sources. Whenever there is insufficient evidence of compliance with the provisions of the technical codes, or evidence that a material or method does not conform to the requirements of technical codes, or in order to substantiate claims for alternative materials or methods, the Building and Safety Official or Fire Code Official shall have the authority to require tests as evidence of compliance to be made at no expense to the jurisdiction. Test methods shall be as specified in this code or by other recognized test standards. In the absence of recognized and accepted test methods, the Building and Safety Official or Fire Code Official shall approve the testing procedures. Tests shall be performed by an approved agency. The details of an action granting approval of an alternate shall be recorded in the files of the Building and Safety Division and the Livermore Pleasanton Fire Department. 20.04.060 Modifications. Wherever there are practical difficulties involved in carrying out the provisions of this code or any technical code, the Building and Safety Official shall have the authority to grant modifications for individual cases, upon application of the owner or owner's representative, provided the Building and Safety Official shall first find that special individual reason makes the strict letter of this code impractical and the modification is in compliance with the intent and purpose of technical codes and that such modification does not lessen health, accessibility, life and fire safety, or structural requirements. The details of actions granting modifications shall be recorded and entered in the files of the Building and Safety Division.