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centrifugal sand separator similar to that described in the Journal of the American Waterworks Association, Vol. 46, No. 2 , February, 1954 . For purposes of the sand guarantee, sand production shall be defined as the average concentration measured over a three minute period beginning with the 12th minute after pumping is commenced. 4 . 4 Plumbness and Alignment The Contractor shall guarantee that the wells shall be sufficiently straight and plumb to permit the free installation and operation of a turbine pump regularly built for 8" I.D. casing. All boreholes shall be constructed and all casing and liners set around, plumb, and true to line as defined herein. To demonstrate the compliance of his work with this requirement, the Contractor shall furnish all labor, tools, and equipment and shall make the tests described herein in the manner prescribed for plumbness and alignment. These tests must be made after the complete construc- tion of the well and before its acceptance. Plumbness and alignment shall be tested by lowering into the well to a depth of 70 feet, a section of pipe 40 feet long or a dummy of the same length. The outer diameter of the plumb shall not be more than one-half inch smaller than the diameter of the part of the casing or hole being tested. If a dummy is used, it shall consist of a rigid spindle with three rings, each ring being 12 inches wide. The rings shall be truly cylindrical and shall be spaced one at each end of the dummy and one ring in the center thereof. The central member of the dummy shall be rigid so that it will maintain the alignment of the axes of the rings. Should the plumb or dummy fail to move freely throughout the length of the casing or hole to a depth of 70 feet or should the well vary from the vertical in excess of two-thirds the smallest inside diameter of the part of the well being tested per 100 feet of depth, or beyond limitations of this test, the plumbness and alignment of the well shall be corrected by the Contractor at his own expense. Should the contractor fail to correct such faulty alignment or plumbness, the supervising geologist may refuse to accept the well. The supervising geologist may waive the require- ments of this paragraph for plumbness if: (a) the Contractor has exercised all possible care in constructing the well and the defect is due to circumstances beyond his control ; (b) the utility of the completed well will not be materially affected; (c) the cost of necessary remedial measures will be excessive. In no event will the provisions of this paragraph with respect to alignment be waived. 4 . 5 Non-Payment for Rejected Wells No payment will be made for any labor or materials involved in the construction of any well, including the reamed enlargement of a test bore hole when such a hole fails to reach the specified or directed final depth and/or diameter for any preventable cause, or when such a well fails to meet these specifications. Such holes 4 - 2