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MISC#4\FILES\9750SPEC ' Page 5 of 22 <br /> 14 . TAKE SOIL SAMPLES FROM EACH CORNER AND FROM THE MIDDLE OF <br /> THE TANK EXCAVATION AFTER THE EXISTING TANKS HAVE BEEN <br /> REMOVED AND SUBMIT TO A QUALIFIED LABORATORY FOR ANALYSIS <br /> FOR AROMATIC HYDROCARBON (GASOLINE) CONTENT. A COPY OF <br /> THE SOIL ANALYSIS, INCLUDING LOCATIM OF SAMPLES, <br /> SAMPLING METHODS, TEST PROCEDURES AND TEST RESULTS SHALL <br /> BE FURNISHED TO THE FIRE PREVENTION BUREAU AND TO THE <br /> REGIONAL WATER QUALITY CONTROL BOARD. SOIL SAMPLES SHALL <br /> BE TAKEN BY AN INDEPENDENT QUALIFIED TECHNICIAN. <br /> 1. 2 EXCAVATION AND BACKFILL OF UNDERGROUND TANKS <br /> A. EXCAVATIONS: Excavate only to the depths required by the <br /> plans, or as instructed by Company Rep. If unexpected water <br /> condition or rock is encountered, immediately contact the <br /> Company Rep. for instruction before proceeding with the <br /> excavation. VERIFY THAT EXCAVATION IS IN ACCORDANCE WITH TANK <br /> MANUFACTURER'S SPECIFICATIONS. <br /> 1. TANK HOLE SIZE IN STABLE SOIL: Size excavation perimeter <br /> to allow 24" minimum between tanks and 24" minimum <br /> between tank sides and end caps and the wall of the tank <br /> hole. <br /> 2 . TANK HOLE SIZE IN UNSTABLE SOIL: Unstable soil is defined <br /> as having less than 750 lbs./sq. ft. cohesion, as <br /> calculated from an unconfined compression test, or soils <br /> with an ultimate bearing capacity of less than 3 , 500 <br /> lbs./sq. ft. Loose sand, muck, bog, peat, swamp or <br /> landfill where soil is soft are generally considered <br /> unstable soils. <br /> a. Size excavation perimeter to allow 24" minimum <br /> between tanks and a minimum of half the tank diameter <br /> between the tank sides/end caps and the wall of the <br /> tank hole. <br /> b. Filter fabric will be used to line tank hole in <br /> unstable soil. <br /> C. Permanent shoring may be used to stabilize the walls <br /> of the tank hole, at the discretion of the Contractor <br /> and/or Company Rep. If permanent shoring is used, <br /> follow "Stable Soil" size criteria. Refer to <br /> "Alternate Backfill Materials" below. <br /> 3 . DEPTH OF TANK HOLE: Contractor is responsible for <br /> establisheing the tank hole depth, considering the length <br /> of piping runs, to the pump blocks and vent risers, pipe <br /> burial depth, yard slope and the following criteria: <br /> (Measure at the Remote Pump opening) . <br /> a. A minimum of 12" backfill material is required under <br /> the tanks. <br />