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of secondary containment shall be provided for underground tank and piping <br />systems. <br />Section 5704.2.11.4.2; change to read as follows,- <br />5704.2.11.4.2 <br />ollows, <br />5704.2.11.4.2 Leak Detection. Underground storage tank systems shall be <br />provided with an approved method of leak detection from any component of the <br />system that is designed and installed in accordance with NFPA 30 and as specified <br />in Section 5704.2.11.4.3. <br />Section 5704.2.11.4; add Section 5704.2.11.4.3 to read as follows: <br />5704.2.11.4.3 Observation Wells. Approved sampling tubes of a minimum 4 <br />inches in diameter shall be installed in the backfill material of each undergroundt <br />flammable or combustible liquid storage tank. The tubes shall extend from a point <br />12 inches below the average grade of the excavation to ground level and shall be <br />provided with suitable surface access caps. Each tank site shall provide a sampling <br />tube at the corners of the excavation with a minimum of 4 tubes. Sampling tubes <br />shall be placed in the product line excavation within 10 feet of the tank excavation <br />and one every 50 feet routed along product lines towards the dispensers, a minimum <br />of two are required. <br />Section 5706.2.4.4 (geographic limits in which the storage of Class I and Class <br />H liquids in above Around tanks is prohibited) to read as follows: <br />5706.2.4.4 Locations where above -ground tanks are prohibited. The storage of <br />Class I and II liquids in above -ground tanks is prohibited within the limits <br />established by law as the limits of districts in which such storage is prohibited <br />otherwise by City of San Marcos Ordinance. <br />Section 5806.2 (geographic limits in which the storage of flammable cryogenic <br />fluids in stationary containers is prohibited) to read as follows: <br />5806.2 Limitations. Storage of flammable cryogenic fluids in stationary containers <br />outside of buildings is prohibited within the limits established by law as the limits <br />of districts in which such storage is prohibited otherwise by of San Marcos <br />Ordinance. <br />Section 6104.2: delete. <br />Appendix B, Section B103.1; change to read as follows: <br />B103.1 Decreases. The fire code official is authorized to reduce the fire -flow <br />requirements for isolated buildings or a group of buildings in rural areas or small <br />communities where the development of full fire -flow requirements is impractical. <br />