CFTOD Dewatering Notes 2022.pdf

Central Florida Tourism Oversight District (CFTOD) Planning & Engineering

Submittal Information Required for SFWMD Dewatering Permit Notification

Dewatering, defined as the act of temporarily removing groundwater for the purpose of achieving a dry condition during construction, renovation and the installation or removal of underground utilities or systems, shall require regulatory permits from both the South Florida Water Management District (SFWMD) and the Florida Department of Environmental Protection (FDEP). Dewatering may include the use of well points, pit pumps, deep wells, sock drains or any other means for lowering the water table or removing water seeping from the ground into a pit, excavation, trench, etc. SFWMD regulates removing the water from the ground and the FDEP regulates the discharge of the water to waters of the State or the US. The Contractor is required to obtain SFWMD permit coverage through CFTOD by completing the permit application listed below. The Contractor receives permit coverage for the discharge of produced groundwater through the FDEP Construction Generic Permit for Storm water Discharge from Large and Small Construction Activities as long as the ground water is not within 500 feet of a known contamination area. If the dewatering activities are within 500 feet of a known contamination area please contact CFTOD Compliance: Melissa Pulver, 407.828.2250 to obtain additional permit requirements.

The Contractor shall submit the following information on company letterhead as part of their dewatering permit notification at least 30 days prior to the anticipated commencement of any dewatering activities (this does not include time for additional information submittals). The Contractor shall not begin dewatering until the District has approved the proposed activity and an inspection of the system has been conducted.

1. Name of contractor;

2. Site location plan showing task specific dewatering locations (does not need to be on company letterhead);

3. Records that indicate the presence or absence of known areas of contamination within the project, and in adjacent areas that could be impacted if dewatering operations are performed. Also, if applicable, reasonable assurance that dewatering activities will not alter the contamination plumes movement or directions,

4. Proposed methods of construction;

5. Estimated pumping rates and duration of pumping;

6. Known volume to be discharged from vessels installed in the wet;

7. Estimated depth of drawdown;

8. Anticipated radius of the cone influence;

9. Proposed points of discharge;

10. Site water routing from excavation to stormwater retention area;

11. Proposed groundwater and surface water monitoring plans and turbidity monitoring plan;

12. Any other sites and tasks specific characteristics worthy of consideration;

13. Hydraulic information (i.e., normal pool and seasonal high water elevations) of any wetlands and surface waters within or adjacent to the proposed dewatering activities.

14. Monthly withdrawals will need to be submitted to CFTOD the first of each month once the dewatering starts.

15. If the Contractor utilizes a sock drain to accomplish its de-watering, then the Contractor shall remove the sock drain when the de-watering work is completed.

Along with the information above, weekly withdrawals will be submitted to the District every Monday for the previous week’s dewatering.

De-watering pump activation (any size/capacity) is to be coordinated via request with CFTOD Planning & Engineering. Pre-Activation inspection is required by CFTOD Personnel for every activation. Advance requests are to be scheduled with CFTOD.

Information shall be submitted through the Planning and Engineering Permitting system BIM 360 under the specific Project Folder, under Dewatering. Contractor shall notify Melissa Pulver through the BIM 360 system. Please see the Applicant Guide from P&E for instructions.

For BIM 360 information, please contact CFTOD P&E at 407-828-2250.

Central Florida Oversight District – Master Dewatering Permit – Turbidity Monitoring Plan Requirements

Description: Monitoring requirements for dewatering discharge. Turbidity is expressed in nephelometric turbidity units (NTU).

Location:

(1) Background- Canals – 5 NTU Bay Lake/7 Seas Lagoon – 1 NTU Reedy Creek – 1 NTU Wetland – 1 NTU

(2) Compliance--Samples shall be taken at the discharge point from the construction activity, i.e. at the location where that construction activity discharges into the receiving canal, lake, creek or wetland, AND at a location a minimum of 200 feet downstream of the location when that construction activity discharges into a canal, lake, or creek AND at any additional sampling locations as specified in this Dewatering Plan drawing.

Frequency: Turbidity monitoring sampling shall be conducted twice daily, with at least a four-hour interval between sampling events, during all work authorized by this permit.

Duration: Monitoring shall begin on the first day of construction for all activities related to the proposed activities. Monitoring shall cease when all construction activities related to the proposed activities are completed. The monitoring data must demonstrate that turbidity 200 feet downstream of all proposed activities or in the downstream canal or wetland is less than or equal to 29 NTU's above natural background turbidity for a period of seven consecutive days after completion of construction.

Reporting: All monitoring data shall be submitted to the District as shown on the attached “CFTOD Weekly Dewatering Report”.

If monitoring reveals violations of the state water quality standard for turbidity, discharge from the construction activities shall cease immediately and not resume until corrective measures have been taken and turbidity has returned to acceptable levels.

CFTOD Weekly Dewatering Report Planning & Engineering Department

P.O. Box 10170, Lake Buena Vista, FL 33830

(407) 828-2250 Fax: (407) 828-2560

Project Name: __________________________________________ Contractor: __________________________________________ Pump# ____________ Location: __________________________________________ Discharging to: __________________________________________

Day/Date Daily Meter Reading

Pump Shut off Reading*

Daily Volume Turbidity Readings (Twice daily minimum of 4 hours apa

Previous Saturd Reading (if applicable)

*Only complet this column when turning off

Morning Afternoon

Sunday

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Weekly Daily Volume Total

Report each meter reading daily. If you are pumping continuously, please carry over the previous week’s last meter reading to report accurate volumes. Please call CFTOD Compliance for questions 407-468-0366.

Note: Report/s for each pump used in dewatering must be submitted to CFTOD Planning & Engineering Department on the following Monday after pumping occurred and continue each Monday until pumping for the location has ended.