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9 accessories, power, fuel, materials, supplies, and lighting necessary to conduct efficient drilling operations. The drilling unit shall be in good condition and of sufficient capacity to perform the specified drilling and well construction. 2.3.2 TEST HOLE DRILLING A. Scope--The test holes shall be drilled using the direct rotary method. The hole shall be drilled at a minimum diameter of 8 3/4 inches. The final depth of each test hole will depend location and the lithology encountered while drilling and will be determined by the Engineer. It is anticipated that the test hole will be approximately 300 feet in depth. B. Methods 1. The test holes shall be drilled using the direct circulation rotary drilling method of construction. The drilling fluid for the direct rotary drilling operation shall conform to the specifications of Section 2.1.3. 2.The drilling operations shall be conducted using equipment that is adequate to reach the depth and perform the evaluations specified in the Technical Provisions. If, in the opinion of the Engineer, the Contractor's equipment is not capable of satisfactorily performing the specified work, the Contractor, at his/her own expense, shall substitute equipment satisfactory to the Engineer. 3. The Contractor shall take all measures necessary to protect the top portions of the test hole from caving or raveling. 4. The Contractor shall keep records providing the following information: a)A record of construction activities for each shift. b)A time drilling log of the test hole recording the time(in minutes) required to drill down each section of drill pipe. c)A log of drilling bit types and depths of changes. d) Record of drilling fluid properties at 4-hour intervals during drilling operations. The record shall show drilling fluid weights, Marsh Funnel viscosity, sand content, drilling fluid losses, and any additives used. e) A drilling log which defines and classifies the type of formations encountered during the drilling. The log will consist of the depth at which each change in formation is encountered, the classification of the material encountered, its color and particle size. Classification of silt, sand, gravel, cobbles, etc. shall be based on the size of material encountered in accordance with the established and accepted geologic standard for classification of these materials. If more than one size of material is encountered in a formation such as"sand and clay", an estimate of the quantity of each shall be recorded, such as"20% sand, 80% clay f)All measurements for depths shall be referenced to the existing ground surface at the well site.