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6 4. In accordance with these Technical Provisions,the Contractor shall submit a drilling fluid program for approval prior to construction. The submittal shall include the recommendations for make-up water conditioning, quantities of clay base, and additives required to maintain a drilling fluid having properties within the ranges specified below for test hole drilling and reaming operations. The drilling fluid shall be maintained in such a manner as not to exceed the properties specified above for weight, viscosity, and sand content without the approval of the Engineer. In addition, the Contractor shall maintain the minimum viscosity of the drilling fluid that will raise cuttings and adequately condition the walls of the holes. At the completion of all drilling operations, the drilling fluid shall be conditioned and meet the following property ranges for well construction. Direct Circulation Property Drilling Method a) Weight: 8.7—9.3 lbs./gal b) Marsh Funnel Viscosity: 28—35 sec/qt c) API Filter Cake Thickness: <3/32 d) Sand Content of Returns: < 1/2% by volume 5. The drilling rig must be provided with equipment to measure the drilling fluid weight, viscosity, API filter cake, and sand content. 6. The Contractor shall maintain a current log describing the condition of the drilling fluid on the site. The log shall include the following: a)time, depth and results of all drilling fluid tests; b) materials added to the system; type, quantity, time, and depth; c)variances or modifications from approved drilling fluid program(e.g.,time,depth, reason, and authorization). 7. Proper control of the drilling fluid must be maintained to the satisfaction of the Engineer. The Contractor will be required, at the Contractor's expense,to retain or employ an experienced, qualified drilling fluid, or mud, engineer to supervise and maintain drilling fluid characteristics to the satisfaction of the Engineer if such control cannot be accomplished by the Contractor. 8. If at any time the drilling fluid is not in compliance with these Technical Provisions or the recommendations of the drilling fluid engineer,as approved by the Engineer,the properties shall be adjusted and the tests rerun until the drilling fluid obtains the specified characteristics. If the specified properties cannot be maintained, the drilling fluid shall be replaced.