All correspondence must be made through the Vendor Portal. Specifications include, but are not limited to: Soil Borings shall be performed as necessary to take split spoon samples and stationary piston samples in soil and rock cores in underlying bedrock or boulders as directed by the Engineer. Unless otherwise directed by the Engineer, it is anticipated that borings shall be made to depths of 20’ below existing ground surface. For determination of soil strata, borings will normally be 3” minimum diameter holes in which 2” O.D. split spoon samples will be taken. If coarse material is encountered, borings may be 4” minimum diameter holes in which 3” O.D. split spoon samples will be taken. The 3” sampler shall be used regardless of the size of casing being employed if, in the opinion of the Engineer, such sampler will recover a representative sample. Undisturbed samples may also be taken. For recovering such samples, a 3” stationary piston sampler will be required. For determination of depth to, and soundness of, bedrock, borings will be 3” minimum diameter holes through which rock cores no less than 1 7/8” in diameter (NQ) can be recovered. In boring methods using a heavy drilling fluid, casing shall be driven to such depth below ground surface as required to maintain the top of the hole. Thereafter, heavy drilling fluid may be used to maintain the boring. At the completion of such holes, the heavy drilling fluid shall be removed by flushing or bailing in order that the true water level may be accurately determined.
