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T.l- between changes in formation, the Contractor shall take two, one-quart, washed, representative sample of the interval of new formation and label and ��' `.4' p E� .b t, preserve each sample in a container as approved by the Engineer. No samples are required for the first one hundred (100) feet of test hole depth. Containers shall be identified with well number, sample depth, and date taken. 1. Return flow samples shall be taken by removing'from the circulation drilling fluid representative samples of the formation by a cyclone -- separator, a "shale shaker", or other approved method in which the w velocity is reduced to the level that representative samples can be obtained reliably. Provisions shall also be made to obtain a record of Y_ circulation time and probable depth of the formation from which the cuttings are derived, or the penetration of the bit'shall be stopped when the bottom of the sampling interval is reached for such time as is required for all the cuttings to move from the last drilled section of the hole and settle at the sampling point. The sample catching device shall be cleaned of all cuttings after each sample is taken. When more cuttings than required are recovered, the total volume of cuttings shall be thoroughly mixed and quartered until the required volume of sample is obtained. 2. Sample collection method and procedure shall be outlined in the . Contractors Plan of Operation. 3. Selected formation samples shall be dried and sieved by the Contractor for grain size distribution, with selected sieves, so that no more than r �, G-t` 30% of the formation material will be held on any one sieve, if possible. At least ten samples shall be tested for grain size distribution. The uniformity coefficient of the formation material will be determined by the Contractor based on these results. B. The Contractor shall be responsible for collecting, bagging and preserving all samples, and recording all sample data. All samples shall be identified by well number, sample depth and date taken. 3.07 Water sampi" A. The Contractor shall submit his Plan of Operation and Sampling Plan prior to v, the beginning of any work at the well site. Upon approval of these submittals by the Engineer, the Contractor shall drill the pilot hole to the depth required, conduct and submit an E-log and submit a well log. The Contractor shall also . make recommendations on the apparent water-bearing strata, which will be sampled, for water quality in a verbal report to the Engineer. B. The Contractor shall take water samples in the Production Well at as many as eight depth locations in the identified aquifers. Such sampling shall be completed by installing a temporary 4-inch casing with 5-foot-long screen at -; the bottom. Sampling shall begin-from the deepest identified location and ]bV continue upward through the shallowest identified location. The screen shall be gravel packed and a water sample shall be obtained by pumping from the Division III-22