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<br />Gr' -.., 3
<br />o....u .'
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<br />Par. 40
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<br />(2) Furnishing all materials and labor for
<br />excavating, leveling, grading, and constructing
<br />suitsbla foundstions for installation of the
<br />turbidity control plant or system and
<br />appurtenances to minimize damage during
<br />periods of high runoff.
<br />
<br />(3) Furnishing all equipment, materials, and
<br />labor for pumping waste water from the tunnels
<br />to the turbidity control plant or system and
<br />appurtenances.
<br />
<br />(4) Operating and maintaining the turbidity
<br />control plant or system and appurtenances in
<br />good condition until completion of the work.
<br />Maintenance shall include the removal of sludge
<br />accumulated during treatment of the waste
<br />water. and wasting the sludge in the waste
<br />disposal area shown on Drawing No. 3
<br />(622-0-2561),
<br />
<br />(5) Removal of the turbidity control plant or
<br />system and appurtenances, cleanup of the site,
<br />and restoration of the site to its original
<br />condition as approved by the contracting officer.
<br />All materials. plant, and appurtenances used for
<br />turbidity control shall remain the property of the
<br />contractor.
<br />
<br />(6) Additional measures used by the contractor
<br />to prevent water pollution in compliance with
<br />the requirements of Subparagraph c.
<br />
<br />b. Turbidity control methods.- Turbidity control
<br />shall be accomplished through the use of a plan
<br />approved by the contracting officer. The
<br />Government's methods for turbidity control set out
<br />below are acceptable methods,
<br />
<br />One of the Government's methods, P-l, for
<br />controlling turbidity in the river is based on
<br />collecting waste water from the tunnels in a sump.
<br />and pumping water from the sump to a water
<br />clarification plant, such as the Dorr-Qliver
<br />Clarifloculator, Type B (1 B-foot diameter by 8.foOl
<br />side water depth). B1 F25-04 chemical feeders with
<br />bag loading hopper, or equal. It is anticipated that
<br />such a plant will treat up to 200 gpm of water from
<br />the tunnels to reduce turbidity of its effluent to not
<br />more than 30 Jackson turbidity units, The plant
<br />shall be equipped with chemical feed equipment
<br />capable of adjusting the alkalinity and pH value of
<br />the effluent,
<br />
<br />Another method, P-2, acceptable to the
<br />Government will be a turbidity control plan, such as
<br />
<br />the Dow Turbidity Control System or equivalent.
<br />Method P-2, in general, consists of the capability, by
<br />use of above-ground equalizing tanks, sedimentation
<br />flumes, settling tanks, and ponds combined with the
<br />use of innocuous stabilizing and flocculating
<br />chemicals, as required, to reduce the turbidity of
<br />polluted water to 30 Jackson turbidity units,
<br />
<br />Method P-1 or P-2 shall also be provided with
<br />bypass and control equipment suitable for blending
<br />treated and untreated waste waters and Obtaining
<br />effluent of varying degrees of turbidity, The
<br />decision to discharge completely treated effluent or
<br />a blend of treated and untreated effluent will be the
<br />responsibility of the contracting officer, and will
<br />depend on the natural turbidity existing in the river
<br />at any particular time.
<br />
<br />All chemicals used in Method P-1 or P-2 must be
<br />approved by the Environmental Protection Agency
<br />for use in potable water and must also have been
<br />previously proven to be harmless to game, fish, and
<br />aquatic plants.
<br />
<br />Sludge accumulations from Method P-1 or P,2 shall
<br />be transported to the waste disposal areas and
<br />deposited so that the material will not wash into the
<br />river by high flows or storm runoff, as approved by
<br />the contracting officer.
<br />
<br />If the contractor elects to utilize either Method P-l
<br />or P.2 and his plan for its implementation is
<br />approved by the contracting officer, and the
<br />approved plan does not effectively control turbidity
<br />due to no fault of the contractor, additional work
<br />will be directed for which payment will be made in
<br />accordance with Clause No. 3 of the General
<br />Provisions.
<br />
<br />If the contractor elects to propose for approval a
<br />plan other than Method P-1 or P-2 for turbidity
<br />control, the contractor shall bear the full
<br />responsibility for its satisfactory operation in
<br />controlling turbidity. The approval of the
<br />contractor's alternate proposal by the contracting
<br />officer shall not be construed to relieve the
<br />contractor from this responsibility.
<br />
<br />Within 30 calendar days alter date of award of
<br />contract, the contractor shall submit, for approval,
<br />his proposed plan, or his proposed implementation
<br />of Method P-1 or P,2, including complete design and
<br />construction details, showing the arrangement of
<br />the turbidity control structures, method for
<br />conveying waste waters to the control structures,
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