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FROM COMPRESSOR PRESSURE RELIEF DEVICE The installing contractor must take all precautions necessary to <br /> (r( AIR SUPPLY VALVE protect employees working in or near a tank excavation.These <br /> CL <br /> AIR SUPPLY GAUGERESERVOIR FITTING precautions should include,but are not limited to: <br /> SERVICE FITTING •Location and protection of any utility installations near the <br /> excavation before opening the excavation; <br /> •Means of securing the walls of the excavation; <br /> •Means of preventing exposure of employees to hazardous <br /> fumes from the excavation; <br /> Protection of employees from hazards associated with water <br /> FIGURE 2-4 accumulation in the excavation; <br /> •Barricades,etc.to prevent unauthorized vehicle or pedestrian <br /> traffic; <br /> SECONDARY(EXTERNAL)TANK TEST •Inspection of the excavation and surrounding area at least daily. <br /> CAUTION:Do not pressurize the secondary tank(interstitial space) For additional information on excavation,trenching and shoring <br /> or the primary tank may rupture and cause tank failure. safety practices,consult OSHAs Construction Industry Standards <br /> Check the exterior of the tank for monitoring liquid—if liquid is Part 1926,Subpart P. <br /> found,wipe the tank dry and verify that the liquid does not The minimum depth of the excavation is normally determined by <br /> reappear.Lift the tank to check the bottom.Do not roll the tank the presence or absence of groundwater and the presence or <br /> DANGER:Do not stand under the tank while it is being lifted. absence of traffic at the site.These dimensions are critical to the <br /> When the test is complete,remove the test manifold.Usually successful installation of a tank and are often regulated by code. <br /> check the interior of the tank for liquid.Replace the protective Refer to: <br /> covers in the service fitting and the reservoir fitting. •federal,state and <br /> local codes <br /> 3. BACKIFILL AND BEDDING •NFPA30&API 1615 <br /> Xerxes tanks must be installed using either pea gravel or crushed •the figures below. <br /> stone which meets the following specifications. NOTE:Numbers in brackets[I 6. 6 <br /> refer to 12'tanks. <br /> GENERAL The material is washed and free flowing and conforms — <br /> ( to the specification of ASTM C-33 para.91,sizes 6 through B.NO <br /> more than 5%(by weight)of the material may pass through a#8 [36 PRY [36' <br /> sieve. It is recommended that the supplier certify that the material owomoNs <br /> conforms to ASTM C-33 and any other applicable specifications. RAFFIC <br /> (For additional information,refer to the Xerxes pamphlet Fiberglass <br /> Tank Backfill Guidelines.) <br /> iz• <br /> Tanks subjected to traffic loads must have a cover depth of at least <br /> 18[36]inches of backfill plus 9 inches of asphalt.An acceptable <br /> alternative is a minimum of 18(36]inches of backfill plus 6 inches <br /> of reinforced concrete. <br /> PEA GRAVEL CRUSHED STONE <br /> 3 3p <br /> 36' VET 35 <br /> I I CONOfTfON6 <br /> PEA GRAVEL:Mix of rounded particles—sizes between 1/8" <br /> awFp,c <br /> and 3/4". <br /> CRUSHED STONE:Mix of angular particles—sizes between 1/8" NOTE:Numbers in bracket[j <br /> and 1/2". refer to 12'tanks. <br /> rz' <br /> NOTE:If material which meets these specifications is not available,contact the <br /> Xerxes Technical service Departinent for information on approved ahernate <br /> materials and installation instructions.Using other than approved bedding and back- Tanks subjected to traffic loads and high water must have a <br /> fill materials without Xerxes'prior written approval will void the tank warranty and minimum of 30[36]inches of backfill and either 9 inches of <br /> may result in tank failure. asphalt or 6 inches of reinforced concrete. <br />