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5. All trenching within three feet (the vicinity) of the petroleum distribution system shall be dug by hand. 6. The contractor shall restore all excavated areas to original conditions. 7. All construction areas shall be clearly marked with barricades, cones, plates or other approved safety markers to restrict access and provide a safe work environment for the contractor and the facilities personnel (includes the public). 8. The contractor shall warranty all materials and construction for a period of one year. The contractor at no expense to the consultant or client shall correct all defects. Equipment failure, not related to the installation, will be covered under manufacture's warranty. 9. All work must be conducted during weekday daylight hours unless approved by the consultant and client. 3.2 Excavation 1. All trenching with a potential of being within three feet of the petroleum distribution system piping and tanks must be hand dug and cleared. 2. All excavated soil shall be placed on and covered with visqueen (6-millimeter plastic sheeting) in an area designated by the consultant. The consultant will collect stockpile soil samples for soil characterization. The consultant will be responsible for disposal of soil at a client-approved facility. The contractor shall dispose of all construction debris off-site including any pavement removed during trenching. If contractor mixes impacted soil and construction debris, the contractor will be financially responsible for the entire soil disposal cost. 3_ Where piping is installed below grade, the piping shall be buried in a trench or excavation at a minimum depth of 124ncises to the top of the piping, unless otherwise stated. The excavation shall be saw cut to provided a square vertical joint for repaving. If excavation must amain open after normal work hours, they shall be covered with traffic rated trench plate capable of supporting typical vehicular traffic for the facility. Excavations shall not stay open over a weekend. 4. Process piping trenching and excavations shall be backfilled with imported clean sandy material from 3-inches below the piping to 34nches top of the piping over which class II AS backfill material is to be placed. The backfill material (class II AS) shall be compacted to approximately 92% of relatively dry density. Pavement removed for trenches or other excavation shall be replaced with new material to match the existing. The asphalt shall be designed and installed to allow normal facility traffic service. When resurfacing with concrete a minimum of G-inch thick, 2504-psi reinforced concrete shall be used. Reinforcing will utilize No. 4 rebar (at a minimum) tied to existing concrete surface using No. 4 rebar dowels, with 4 inch penetration into existing pad, staggered every 24-inches. The dowels will be placed at mid-thickness in the existing slab (minimum of 3-inchs of cover). 5. The contractor shall contain loose debris end etore construction material on a daily basis prior to d^w-prarture from the siZe to provide G clean, sero and orderly umrk arem.