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3.8.5.2. Visually check the interior of the tank for monitoring fluid. There should not be any. 3.8.5.3. Replace the protective covers in the service fittings and the reservoir fitting. 4.1. GENERAL 4.1.1. Xerxes tanks must be installed using either pea gravel or crushed stone as backfill material. 4.1.2. Using other than approved bedding and backfill materials without prior written authorization from Xerxes will void the tank warranty. CAUTION Use of unapproved backfill material may cause tank failure, or damage the tank or surrounding property. 4.1.3. Approved backfill material must meet the following specifi- cations: 4.1.3.1. The material is washed, free-flowing, and free of ice, snow and debris. 4.1.3.2. When using pea gravel, the material is to be a mix of rounded particles, sizes between 1/8 inch and 3/4 inch. (See FIGURE 4-1.) The pea gravel must conform to the specifications of ASTM C-33, paragraph 9.1, sizes 6,67 or 7. 3/4" 4,0 FIGURE 4-1 4.1.3.3. When using crushed stone, the material is to be a mix of angular particles, sizes between 1/8 inch and 1/2 inch. (See FIGURE 4-2.) The crushed stone must conform to the specifications of ASTM C-33, paragraph 9. 1, sizes 7 or 8. FIGURE 4-2 10 C 4.1.3.4. No more than 5% (by weight) of the material may pass through a #8 sieve. 4.1.3.5. It is recommended that the materials supplier certifies that the material conforms to ASTM C-33 and any other applicable specifications. 4.1.4. For additional information, refer to the Xerxes document, Backfill Guidelines. 4.1.5. If material which meets these specifications is not available, contact technical support at Xerxes Minneapolis for information on alternate materials and the process for approval. ®WARNING Follow OSHA regulations for tank excavations. Collapse of excavation walls could result in death or serious injury. 5.1. GENERAL 5.1.1. The installing contractor must take all precautions necessary to protect employees working in or near a tank excavation. These precautions should include, but are not limited to the following: 5.1.1.1. Locate and protect any utility installations near the excavation before opening the excavation. 5.1.1.2. Secure the walls of the excavation. 5.1.1.3. Prevent exposure of employees to hazardous fumes from the excavation. 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. 5.1.2. For additional information on excavation, trenching and shoring safety practices, consult OSHA's Standard, Part 1926, Subpart P (Excavations), 650-652; and "Fall Protection Rules and Regulations." 5.2. BURIAL DEPTH 5.2.1. The minimum depth of the excavation is normally determined by the presence or absence of groundwater and the presence or 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 a cover depth of at least 36 inches of backfill [48 inches for