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204 DRILLING FLUIDS <br /> A The Contractor shall retain an experienced, qualified mud engineer to establish a <br /> drilling fluid control program prior to commencement of any drilling operations <br /> and the program shall be submitted to the City <br /> B Use only potable water in drilling fluids, whether employed alone or in <br /> combination with drilling additives Drilling fluid additives will be allowed only <br /> under extreme circumstances The Contractor shall submit a list to the Engineer <br /> showing all drilling fluid additives that will be used, or are anticipated to be used <br /> during the drilling operations prior to commencement of the drilling Use only <br /> commercial chemical products in common usage in the project area for water <br /> well drilling in the makeup of any drilling fluid Biodegradable muds will not be <br /> allowed Do not perform drilling with a mixture of water and unprocessed mud or <br /> other materials The drilling fluid shall possess such characteristics as are <br /> required to adequately maintain the walls of the hole to prevent caving of the <br /> walls as drilling progresses and to permit recovery of representative samples of <br /> cuttings Drilling fluid recirculated to the drill pipe or borehole shall not contain <br /> in excess of 2% sand <br /> C Maintain controlled drilling fluid characteristics during the entire operation of well <br /> construction The Contractor shall have at the job site the equipment necessary <br /> to measure drilling fluid weight, marsh funnel viscosity, and sand content <br /> The Contractor shall maintain a drilling fluid with the average properties given <br /> below <br /> a) Weight 8 3 - 8 9 Ib /gal <br /> b) Marsh Funnel Viscosity 28 - 35 sec/qt <br /> C) Sand Content less than 2% by volume <br /> D Maintain a record showing any variation in the addition and amount of chemical <br /> products, or water required during drilling Show the depths at which such <br /> changes are required in the daily reports <br /> 2 05 SAMPLE CONTAINERS <br /> Provide wide-mouth, plastic, pmt waterproof containers with tight-sealing lids <br /> IPART 3 - EXECUTION <br /> 3 01 TEST HOLE DRILLING <br /> I Drill 18-inch diameter test holes to a depth of 1000 feet below the ground surface by the <br /> reverse circulation rotary method <br /> 3 02 FORMATION SAMPLING <br /> Take two representative formation samples at each interval of 10 feet and at each <br /> change in formation Before collecting the samples, stop drilling and circulate drilling <br /> fluid until all cuttings are removed from the hole, then resume drilling and collect <br /> August 2001 Division 111 -11 Ball Park& Park & Ride Wells Ph 1 <br />