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3.8.5.2.Visually check the interior of the tank for monitoring 4.1.3.4.No more than 5%(by weight)of the material may pass fluid.There should not be any. through a#8 sieve. 3.8.5.3.Replace the protective covers in the service fittings and 4.1.3.5. It is recommended that the materials supplier certifies the reservoir fitting. that the material conforms to ASTM C-33 and any other applicable specifications. 4. BACKIFILL MATERIAL 4.1.4. For additional information,refer to the Xerxes document, 4.1.GENERAL Backfill Guidelines. 4.1.1.Xerxes tanks must be installed using either pea gravel or 4.1.5. If material which meets these specifications is not crushed stone as backfill material. available,contact technical support at Xerxes Minneapolis for 4.1.2.Using other than approved bedding and backfill materials information on alternate materials and the process for approval. without prior written authorization from Xerxes will void the tank warranty. 5. EXCAVATION CAUTION WARNING Use of unapproved backfill material may cause tank failure, or damage the tank or surrounding property. Follow OSHA regulations for tank excavations. Collapse of excavation walls could result in death or serious injury. 4.1.3.Approved backfill material must meet the following specifi- cations: 5.1.GENERAL 5.1.1.The installing contractor must take all precautions necessary 4.1.3.1.The material is washed,free-flowing,and free of ice, to protect employees working in or near a tank excavation.These snow and debris. precautions should include,but are not limited to the following: 4.1.3.2.When using pea gravel,the material is to be a mix of 5.1.1.1.Locate and protect any utility installations near the rounded particles,sizes between 1/8 inch and 3/4 inch.(See excavation before opening the excavation. FIGURE 4-1.)The pea gravel must conform to the specifications of ASTM C-33,paragraph 9.1,sizes 6,67 or 7. 5.1.1.2.Secure the walls of the excavation. 3l4" 5.1.1.3.Prevent exposure of employees to hazardous fumes from the excavation. C�l 5.1.1.4.Protect employees from hazards associated with water accumulation in the excavation. 5.1.1.5.Erect barricades,etc.,to prevent unauthorized vehicle or pedestrian traffic. 5.1.1.6.Inspect,a minimum of once a day,the excavation and surrounding area. FIGURE 4-1 5.1.2. For additional information on excavation,trenching and shoring safety practices,consult OSHA's Standard,Part 1926, 4.1.3.3.When using crushed stone,the material is to be a mix of Subpart P(Excavations),650-652;and"Fall Protection Rules angular particles,sizes between 1/8 inch and 1/2 inch. (See and Regulations." FIGURE 4-2.)The crushed stone must conform to the 5.2.BURIAL DEPTH specifications of ASTM C-33,paragraph 9.1,sizes 7 or 8. 5.2.1.The minimum depth of the excavation is normally determined 1/2" by the presence or absence of groundwater and the presence or 1/8" absence of traffic at the site.These dimensions are critical to the successful installation of a tank and are often regulated by code. 5.2.2. For additional requirements and specifications,refer to federal,state and local codes;NFPA 30,30A and 31;API RP 1615;PEI RP100;and FIGURE 5-1 and FIGURE 5-2. 5.2.3. In all cases,the depths of cover given in 5.2.3.1.and in 5.2.3.2.are minimums. 5.2.3.1.Tanks subjected to traffic loads(H-20 loads)must have FIGURE 4.2 a cover depth of at least 36 inches of backfill[48 inches for 10