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CALIFORNIA CODE OF REGULATIONS TITLE 23 DIVISION 3 CHAPTER 16 ARTICLES 1-11 <br />(A) The below -grade piping operates at less than atmospheric pressure <br />(suction piping); <br />(B) The below -grade piping is sloped so that the contents of the pipe will <br />drain back into the storage tank if the suction is released (gravity -flow <br />piping); <br />(C) No valves or pumps are installed below grade in the suction line. Only <br />one check valve is located directly below and as close as practical to the <br />suction pump; <br />(D) An inspection method is provided which readily demonstrates <br />compliance with subdivisions (A) through (C) above. <br />(b) All corrodible underground piping, if in direct contact with backfill material, shall be <br />protected against corrosion. Piping constructed of fiberglass -reinforced plastic, steel with <br />cathodic protection, or steel isolated from direct contact with backfill, fulfills this corrosion <br />protection requirement. Cathodic protection shall meet the requirements of section <br />2635(a)(2). <br />(c) Underground primary piping shall meet all of the following requirements: <br />(1) Primary piping in contact with hazardous substances under normal operating <br />conditions shall be installed inside a secondary containment system which <br />may be a secondary pipe, vault, or a lined trench. All secondary containment <br />systems shall be sloped so that all releases will flow to a collection sump <br />located at the low point of the underground piping. <br />(2) Primary piping and secondary containment systems shall be installed in <br />accordance with an industry code of practice developed in accordance with <br />voluntary consensus standards. The owner or operator shall certify that the <br />piping was installed in accordance with the above requirements of section <br />2635(d). The certification shall be made on the "Underground Storage Tank <br />Certification of Installation/Modification" form in Title 27, Division 3, <br />Subdivision 1, Chapter 6. <br />(d) Lined trench systems used as part of a secondary containment system shall be designed <br />and constructed according to a code of practice or engineering standard approved by a <br />state registered professional engineer. The following requirements shall also apply: <br />(1) All trench materials shall be compatible with the substance stored and <br />evaluated by an independent testing organization for their compatibility or <br />adequacy of the trench design, construction, and application. <br />31 <br />