Specifications include, but are not limited to: Geotechnical, Surface & Subsurface (Drilling) Services for the Southern Counties of West Virginia; 3.1 Contract Item # 1 – Soil Borings: 3.1.1 The Vendor shall drill or bore standard diameter holes into and through the soil mantle to bedrock and collect samples in conformance with instructions by a WVDEP representative. The purpose of the soil boring is to determine the nature and characteristics of the soil material over the bedrock.; 3.1.1.1 All bore (drilling) holes shall be of a standard (i.e., same size) diameter, with the standard diameter within a range of 2-inch to 6-inch. Alternate diameter borings must be approved by the WVDEP.; 3.1.2 The Vendor shall furnish a power-driven earth boring rig to provide a clean standard diameter hole to depths specified. Accessories, casing power for driving and sampling, data sheets, labels, sample containers, boxes and other necessary supplies will be furnished by the Vendor. All drillers and drill helpers shall be included in this price.; 3.1.3 The soil boring holes not receiving a piezometer shall be backfilled with bentonite as approved by the WVDEP.; 3.1.4 The soil borings shall be paid on a per linear foot basis of soil boring shown on the bore logs. No payment shall be paid until the bore hole is backfilled as approved by the WVDEP.; 3.2 Contract Item #2 – Soil borings with standard penetration tests: 3.2.1 The Vendor shall drill or bore standard diameter holes into and through the soil mantle to bedrock and conduct Standard Penetration Tests and collect samples in conformance with instructions by a WVDEP representative. The purpose of the soil boring with Standard Penetration Tests and collecting samples is to determine the nature and characteristics of the soil material over the bedrock.; 3.2.1.1 All bore (drilling) holes shall be of a standard (i.e., same size) diameter, with the standard diameter within a range of 2-inch to 6-inch. Alternate diameter borings must be approved by the WVDEP Engineer. A Standard Penetration Test (SPT) is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of soil. The test procedure is described in ASTM D1586. The test uses a thick-walled sample tube, with an outside diameter of 50mm (~2 in.) and an inside diameter of 35 mm (~1.4 in.), and a length of approximately 650 mm (~26 in.). This is driven into the ground at the bottom of a borehole by blows from a slide hammer with a weight of 63.5 kg (~140 lb.) falling through a distance of 760 mm (~30 in.). The sample tube is driven 150 mm (~6 in.) into the ground and then the number of blows needed for the tube to penetrate each 150 mm (~6 in.) up to a depth of 450 mm (~18 in.) is recorded. The sum of the number of blows required for the second and third 6 in. of penetration is termed the “standard penetration resistance” or the “N-value”. The blow count provides an indication of the density of the ground.; 3.2.2 The Vendor shall furnish a power-driven earth boring rig to provide a clean standard diameter hole to depths specified for Standard Penetration Tests, NX rock core boring, and other in place tests. The equipment shall include a split barrel sampler and drive weight assembly as required by ASTM Specification D-1586, Shelby tube sampler, and sand traps, core retainers, and other devices used to retain the samples. Accessories, casing power for driving and sampling, data sheets, labels, sample containers, boxes and other necessary supplies will be furnished by the Vendor. All drillers and drill helpers shall be included in this price. ; 3.2.3 The soil boring holes not receiving a piezometer shall be backfilled with bentonite as approved by the WVDEP. ; 3.2.4 The soil borings shall be paid on a per linear foot basis of soil boring shown on the bore logs. No payment shall be paid until the bore hole is backfilled as approved by the WVDEP.; 3.3 Contract Item #3 – Split spoon samples: 3.3.1 Split Spoon Samples must be collected in conjunction with soil drilling activities at a frequency required by the WVDEP.; 3.3.2 Split spoon samplers must be compatible with the drilling equipment being used and as outlined by ASTM D1586.; 3.3.3 Split spoon sample frequency and results must be recorded, and the results submitted on the type written bore logs.; 3.3.4 Split spoon samples will be paid on a per each basis.; 3.4 Contract Item #4 – Shelby tube samples: 3.4.1 Shelby Tube Samples must be collected in conjunction with soil drilling activities at a frequency required by the WVDEP.; 3.4.2 Shelby Tube Samplers must be compatible with the drilling equipment being used and as outlined in AST D1587.; 3.4.3 Shelby Tube Samples must be collected and utilized for compression tests as required by the WVDEP and the results submitted in typewritten form.; 3.4.4 Shelby Tube Samples will be paid on a per each basis.; 3.5 Contract Item #5 – Rock boring; 3.5.1 The Vendor shall drill or bore holes to depths specified by WVDEP.; 3.5.2 The Vendor shall furnish a rotary drill rig complete with accessories, supplies, and operators/laborers. The drill rig must be mobile, either truck, trailer, wheel, track, or skid mounted, powered by an engine, capable of drilling vertical holes to depths of 200 feet.; 3.5.3 Accessories and supplies for drilling shall include all casing, drill rods, bits, piping, pumps, tools, water supply and power.; 3.5.4 Rock drilling shall be done in such a manner to produce standard diameter rock bores.; 3.5.4.1 All bore (drilling) holes shall be of a standard (i.e., same size) diameter, with the standard diameter within a range of 2-in. to 6-in. Alternate diameter borings must be approved by the WVDEP.; 3.5.5 The Vendor shall furnish a water truck or truck with a portable water tank capable of hauling a minimum of 500 gallons as necessary when water supplies are not readily available.
