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Specification No . : RGS0024-87 <br /> Part II - SPECIFIC CONDITIONS <br /> Section 9 - Specific Conditions <br /> for Tank Installation <br /> 9 . 7 . 3 Slope : All horizontal product , vapor , and vent piping <br /> shall slope upward from tank a minimum of 1 / 4 inch ger <br /> foot . <br /> 9 . 7 . 4 Vent pipe riser shall be 12 feet high minimum, attached to <br /> to the six inch pipe support as shown on the project <br /> plans . <br /> 9 . 7 . 5 Tanks shall be fabricated in accordance with Underwriters <br /> Laboratories , Inc . standards for underground storage tanks . <br /> Underwriters ' label shall be affixed to each tank . <br /> 9 . 7 . 6 All openings shall be covered with treated pipe plugs to <br /> prevent entrance of dirt and moisture during shipment . <br /> 9 . 7 . 7 Fabricators label in location shown shall include <br /> capacity , length and diameter . <br /> 9 . 7 . 8 Cooperate with inspection and testing agencies engaged by <br /> P .G. & E . <br /> 9 . 8 Excavating and Backfilling : <br /> 9 . 8 . 1 Verification of Existing Conditions : It shall be one of <br /> the responsibilities under this section to examine the <br /> site of work , and after investigation to determine the <br /> character of the materials to be encountered and the <br /> existing conditions affecting the work. <br /> 9 . 8 . 2 Excavation shall be unclassified and shall include the <br /> removal of all buried obstructions within the area to be <br /> excavated . <br /> 9 . 8 . 3 The excavation for the storage tank shall be sufficiently <br /> large to permit proper backfilling on all sides of the <br /> tank . Existing retaining walls and footings shall be <br /> protected . <br /> 9 . 8 . 4 Tank Bed and Backfill : A 12 inch bed of 3/8 inch diameter <br /> diameter pea gravel shall be provided to assure a uniform <br /> support under the tank . Backfill uniformly with free <br /> flowing clean pea gravel ( naturally rounded aggregate with <br /> particles ranging from 1 / 8 inch to 3/8 inch in diameter ) <br /> covering tank to within 12 inches of grade and finish with <br /> 1 / 4 inch diameter crushed stone . Use caution to avoid the <br /> • IX-5 <br />