SECTION 01561

DEWATERING PERMITS

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Coordinate text with related provisions in General Conditions Article 6.7 and Technical Specifications Division 2 and Sections P-152, P-160, P-701 and P-710.

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PART 1 GENERAL

1.01 REQUIREMENT INCLUDED

A. Dewatering of excavations and disposal of water in accordance with Technical Specifications and applicable permits.

1.02 RELATED REQUIREMENTS

A. General Conditions

B. [Section 021XX - Excavation]

C. [Section P-152 - Excavation and Embankment]

D. [Section P-160 - Excavation/Disposal of Contaminated Soils/Groundwater]

E. [Section P-701 - Trenching, Backfilling and Jacking]

F. [Section P-710 - Underwater Construction]

PART 2 PRODUCTS

Not Used.

PART 3 EXECUTION

3.01 PERMITTING PROCESS

A. Every Contractor whose work extends to, or below the ground water table shall, as required by the approved Dewatering Master Plan Permit [also called Master Water Use Permit (MWUP)], apply to and obtain from the permitting agencies (DERM and SFWMD) a Site Specific Dewatering Permit.

DEWATERING PERMITS

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B. The procedure to apply for the Site Specific Dewatering Permit shall be as directed by the Miami-Dade Aviation Department Environmental Engineering Division.

C. The Bidders and the Contractor are advised that it might take up to 120 days from the date the application for the Site Specific Dewatering Permit submittal to the date of the permit's issuance (or the issuance of the letter(s) of exemption) by the permitting agencies; such time has been included in the Contract Time and the Bidders and the Contractor are required to take such time into consideration during the bid preparation and the execution of the work. No extension of contract time will be allowed for this permitting time; however, a non-compensable excusable delay will be granted for the amount of days in excess of the above prescribed 120 days whenever the permitting process takes longer, due to no fault of the Contractor, than the above assumed 120 days.

D. A copy of the Site Specific Dewatering Permit, or the equivalent letter of Exemption, shall be delivered to the Field Representative prior to the start of any work necessitating dewatering.

E. In addition to the above provisions, the following procedure, have been established by DERM that must be followed by all contractors in the processing and acquisition of dewatering permits:

(1) All proposals for dewatering at MIA, regardless of site location, pumping duration, or point of discharge, shall be submitted for review, to the Water Control Section, through the Airports Program, Pollution Prevention Division (which will coordinate the review process within DERM).

(2) Proposals shall include laboratory results of appropriate analyses performed on groundwater samples obtained from the location proposed for dewatering. Prior to any sampling, the Contractor shall contact the DERM, Airports Program at (305) 372-6885 for further information regarding analytical parameters.

(3) Proposals shall include a site specific scaled drawing which depicts, as a minimum, the sampling location, the proposed dewatering location, the immediate and ultimate point of discharge of the effluent, and any structures or topography which may provide an acceptable frame-of-reference for the sampling and dewatering locations.

(4) In addition to the general permit conditions required for a Class II Permit for dewatering, and the requirements of Section P-160 of the Specifications, the expected flow rate and pumping duration shall be included in the proposal so that an overall groundwater volume may be determined.

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(5) In general, discharge of the effluent from the dewatering activities directly to the aquifer or to land surface shall not be permitted. However, if discharge to surface waters is impractical due to the site location, and the area is proven to be free of soil and groundwater contamination, then discharge directly to the aquifer or to land surface may be considered.

3.02 Dewatering of excavation shall be performed in accordance with the applicable provisions of the MWUP, the Site Specific Dewatering Permit and the following:

A. The Contractor shall commence filling the waterbodies at the terminus of the waterbody and proceed in an unidirectional manner. It is the intent to minimize any adverse impacts on fish, wildlife, natural environmental values, and water quality and allow an opportunity for mobile fauna to migrate to open unfilled waters.

B. The Contractor shall institute necessary measures during construction to reduce erosion, turbidity, nutrient loading and sedimentation in the receiving stormwater facilities. Turbidity shall not exceed 29 Nephelometric Turbidity Units above the natural background values.

C. The Contractor shall be responsible for the maintenance of existing stormwater facilities within the construction limits, including any stormwater discharge offsite that traverses the construction limits.

3.03 A. When construction begins, and until construction is completed, the Contractor shall file monthly report indicating the quantity of water pumped each day. If no pumping occurs in a particular day, show "O" or "none" on the report. A sample copy of this monthly report will be provided to the Contractor by the Field Representative or the Miami-Dade Aviation Department Environmental Engineering Department.

B. Additional reports forms may be required to be filed in the event that a remedial action program (RAP) has to be implemented.

C. As required by the various permitting agencies, additional tests may have to be performed once the dewatering operations has begun.

D. Copies of reports filed with the permitting agencies, as indicated on items 3.03 A, B and C above are to be forwarded to the Miami-Dade Aviation Department and the Architect/Engineer of the MWUP. Originals shall be transmitted to the permitting agencies.

END OF SECTION

DEWATERING PERMITS

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