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"5704.2.11.4 Leak prevention. Leak prevention for underground <br />tanks shall comply with Sections 5704.2.11.4.1 through 5704.2.11.4.3. An <br />approved method of secondary containment shall be provided for <br />underground tank and piping systems." <br />Section 5704.2.11.4.2, Leak detection, shall be amended to read as follows: <br />"5704.2.11.4.2 Leak detection. Underground storage tank systems <br />shall be provided with an approved method of leak detection from any <br />component of the system that is designed and installed in accordance with <br />NFPA 30 and as specified in Section 5704.2.11.4.3." <br />Section 5704.2.11.4, Leak prevention, shall be amending by adding Section <br />5704.2.11.4.3, Observation wells, to read as follows: <br />"5704.2.11.4.3 Observation wells. Approved sampling tubes of a <br />minimum 4 inches in diameter shall be installed in the backfill material of each <br />underground flammable or combustible liquid storage tank. The tubes shall <br />extend from a point 12 inches below the average grade of the excavation to <br />ground level and shall be provided with suitable surface access caps. Each <br />tank site shall provide a sampling tube at the corners of the excavation with a <br />minimum of 4 tubes. Sampling tubes shall be placed in the product line <br />excavation within 10 feet of the tank excavation and one every 50 feet routed <br />along product lines towards the dispensers, a minimum of two are required." <br />Section 6103.2.1, Portable containers, shall be amended by adding Section <br />6103.2.1.8, Jewelry repair, dental labs and similar occupancies, to read as follows: <br />"6103.2.1.8 jewelry repair, dental labs and similar occupancies. <br />Where natural gas service is not available, portable LP -Gas containers are <br />allowed to be used to supply approved torch assemblies or similar appliances. <br />Such containers shall not exceed 20 -pound (9.0 kg) water capacity. Aggregate <br />capacity shall not exceed 60 -pound (27.2 kg) water capacity. Each device shall <br />be separated from other containers by a distance of not less than 20 feet." <br />Section 6104.2, Maximum capacity within established limits, shall be amended <br />to add an exception 2 to read as follows: <br />"Exceptions: <br />"2. Except as permitted in Sections 308 and 6104.3.2, LP -gas containers <br />43 <br />