Trench system shall include metallic lids, and openings on the bottom adequate for conduit entry. Trench system shall include provisions for securing a 4/0 soft drawn copper ground conductor on both sides running the entire length of the trench. The precast components are designed to conform to requirements stated in ASTM C857-07 "Practice for Minimum Structural Design Loading for Underground Precast Concrete Utility Structures, ASTM C858-07 "Specifications for Underground Precast Concrete Utility Structures". Cement shall conform to ASTM C150-07 "Specification for Portland Cement". Course and fine aggregates shall conform to ASTM C33 "Specification for Concrete Aggregates". Preparation of concrete shall conform to ASTM C94 "Specification for Ready-Mix Concrete" & ACI 304 "Guide for Mixing, Transporting and Placing Concrete". All galvanized steel covers and hardware shall meet the following requirements: • Steel Deck Plating - ASTM A786 • Steel Sheet - A1011 HSLAS Gr 50 • Steel Angles & Flats - ASTM A-36 • Galvanized Covers - ASTM 123 • Galvanized Hardware - ASTM 153 All stainless steel hardware shall meet the following requirements: • Stainless Steel Angles & Flats Type 304 - ASTM A276 • Stainless Steel Sheet Type 304 - ASTM A-240
