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establish bench marks , base lines , and reference points for locating principal structures . From this information , the Contractor shall develop and make all additional detail surveys and measurements necessary for the construction of the work. The Contractor shall keep the Engineer informed a reasonable time in advance of the times and places at which he will need lines, elevations, and reference points . Unless authorized by the Engineer, any work done without line and grade will be done at the Contractor ' s risk . The Contractor shall be responsible for the accuracy of his own layout work , and shall be liable ' for the preservation of all established lines and grades . Stakes damaged or destroyed by the operations of the Contractor will be replaced at his expense. , G5. 08 Materials and Tests . All materials shall be new and of a quality equal to that specified. Whenever the quality or kind of material or article is not particularly specified , the , materials or articles shall be of the best grade in quality and workmanship obtainable in the market from firms or established good reputation. At the option of the Engineer , the source of ' supply of each of the materials entering into the construction of the work shall be approved by the Engineer before delivery is undertaken. When requested by the Engineer, samples or test specimens of the materials proposed to be used shall be prepared at the expense of the Contrator and furnished by him in such ' quantities and sizes as may be required for proper examination and tests , with all freight charges prepaid, and with complete information as to the type, kind, or size of material and its ' source . All samples shall be submitted in ample time to permit the making of proper tests , analyses , or examinations before the time at which it is desired to incorporate the material into the work, and no material shall be used in the work unless or until it has been approved by the Engineer . All tests of material shall be made by the Engineer in accordance with recognized standard practice. Samples may be secured and tested whenever deemed necessary by the Engineer to determine the quality of materials . All tests will be made at the Agency' s expense, unless stated otherwise to be at the Contractor ' s , expense. Materials shall be furnished in ample quantities and at such times as to assure uninterrupted progress of the work . Materials, supplies, and equipment shall be stored properly and protected as required . The Contractor shall be entirely responsible for damage or loss by weather or other causes. G5. 09 Plant Inspection. The Engineer may inspect the production of materials or manufacture of products at the source of supply . Plant inspection, however , will not be undertaken until the G-18 '