ML19095B428
| ML19095B428 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 12/14/2018 |
| From: | Raffenberg M Florida Power & Light Co |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19095B530 | List: |
| References | |
| L-2019-031 | |
| Download: ML19095B428 (7) | |
Text
Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 RWS Second Quarter Status Report L-2019-031 Enclosure 6 Page 1 of 3 Florida Power & Light Company (FPL)
Turkey Point Recovery Well System (RWS) Second Quarter Status Report; DERM File Number HWR-851 December 14, 2018
Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 l=PL.
December 14, 2018 Wilbur Mayorga, P.E.
RWS Second Quarter Status Report Chief, Environmental Monitoring and Restoration Division Department of Regulatory and Economic Resources Environmental Resources Management 701 NW 1st Court, 4th Floor Miami, Florida 33136-3912 L-2019-031 Enclosure 6 Page 2 of3 RE:
Florida Power & Light Company (FPL) - Turkey Point Recovery Well System (RWS) Second Quarter Status Report; DERM File Number HWR-851
Dear Mr. Mayorga,
Pursuant to the Miami-Dade County (MDC) Department of Regulatory and Economic Resources' Division of Environmental Resources Management (DERM) May 15, 2017 letter, FPL submits the following quarterly RWS status summary for the period August 15, 2018 through November 15, 2018. The RWS has operated as designed since beginning full operation on May 15, 2018 and has yielded positive results in terms of hypersaline groundwater extraction and salt mass removal.
During the reporting period, the RWS operated daily, extracting approximately 1.25 billion gallons of hypersaline water from the Biscayne aquifer and removing approximately 510 million pounds of salt (numbers are based on preliminary data). Preliminary groundwater monitoring and RWS operation data collected during the second quarter are available on the FPL electronic data management system (EDMS) https://www.ptn-combined-monitoring.com.
Groundwater salinity and water level data collected from Consent Agreement monitoring wells during the second quarter were within historic ranges with the exception of TPGW-2S and 15S that recorded the lowest salinity levels for their respective periods of record and TPGW-1 S that posted lowest salinity values since 2012 (Figure 1 ). Salinity levels in wells TPGW-1 S and TPGW-15S dropped over 9 psu during the first two quarters of operation (from 33.8 to 24.5 psu and from 33.6 to 11.9 psu respectively). It is acknowledged that the data presented here are preliminary, subject to change upon upcoming quality control reviews and groundwater salinity values are the result of a variety of factors that influence changes in salinity levels. However, the salinity trends observed in these three shallow monitoring wells are significant and consistent with modeled early groundwater responses of the RWS. While it is possible that salinity levels in these wells could level off or increase during the upcoming dry season, these data are encouraging despite the short duration of RWS operation and may be indicative of the effectiveness of the RWS reducing and retracting the hypersaline plume.
Salinity levels in other shallow groundwater monitoring wells west of the CCS also showed declines since RWS operations began on May 15, 2018 although not to the same degree as the three wells discussed above. No significant changes in salinity in the middle or deep monitoring wells have been observed since the RWS commenced. Data acquisition from the TPGW-18 wells continued to be impacted by persistent instrument interference during the second quarter and replacement equipment has been deployed.
Salinity levels within the RWS production wells remained stable during the second quarter of operation with a combined average of approximately 54 psu (same as first quarter). Some sensors experienced intermittent data anomalies associated with lightening events and/or data probe problems and the data will be corrected and qualified in accordance with the Quality Assurance/Quality Control Plan as scheduled.
Florida Power & Light Company 700 Universe Boulevard, Juno Beach, FL 33408
Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 Wilbur Mayorga December 14, 2018 Page 2 of2 60.00 50.00 40.00
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Ill 20.00 10.00 0.00 RWS Second Quarter Status Report Shallow Groundwater Salinity Trends:
TPGW-1S, 2S, and 15S TPGW*lS -
TPGW-2S TPGW-15S Figure 1: Groundwater salinity trends in monitoring wells near the CCS L-2019-031 Enclosure 6 Page 3 of 3 RWS Operations Begin Since the RWS began operations, the interceptor ditch (ID) pumps have not operated, therefore an evaluation of the cumulative drawdown and assessment of adverse impacts to the wetlands from simultaneous pumping of the RWS and ID is not applicable. Daily water level data used to determine whether ID pump operations are triggered are presented in the FPL EDMS under the 'Interceptor Ditch Operations' tab.
FPL appreciates your review of this submittal. Should you have any questions, please contact me (561) 691-2808 or Scott Bums (561) 694-4633.
Sincerely, U~,a~~
Matthew J. Raffenberg Sr. Director of Environmental Licensing and Permitting CC:
Lee Hefty, DERM Alan Stodghill, FDEP
Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 RWS Third Quarter Status Report L-2019-031 Enclosure 7 Page 1 of 4 Florida Power & Light Company (FPL)
Turkey Point Recovery Well System (RWS) Third Quarter Status Report; DERM File Number HWR-851 March 15, 2019
Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 March 15, 2019 Wilbur Mayorga, P.E.
RWS Third Quarter Status Report Chief, Environmental Monitoring and Restoration Division Department of Regulatory and Economic Resources Environmental Resources Management 701 NW 1st Court, 4th Floor Miami, Florida 33136-3912 L-2019-031 Enclosure 7 Page 2 of 4 RE:
Florida Power & Light Company (FPL) - Turkey Point Recovery Well System (RWS) Third Quarter Status Report; DERM File Number HWR-851 Pursuant to the Miami-Dade County (MDC} Department of Regulatory and Economic Resources' Division of Environmental Resources Management (DERM) May 15, 2017 letter, FPL submits the following quarterly RWS status summary for the period November 15, 2018 through February 15, 2019. Operation of the RWS began on May 15, 2018 and this report covers the third quarter of hypersaline groundwater extraction. Due to the 30 day reporting timeframe specified in the DERM letter, quality assurance/quality control procedures had not been fully completed at the time of submittal and therefore, the data and findings are considered preliminary. Final data will be incorporated in the annual report required by the Consent Agreement Summary Similar to the second quarter, the RWS has operated as designed since beginning full operation on May 15, 2018 and has yielded positive results in terms of hypersaline groundwater extraction and salt mass removal. During the third quarter of operation, the RWS extracted approximately 1.02 billion gallons of hypersaline water from the Biscayne aquifer incorporating approximately 403 million pounds of salt.
Preliminary groundwater monitoring and RWS operation data collected during the quarter are available on the FPL electronic data management system (EDMS) https://www.ptn-combined-monitoring.com Observations During the Period Salinity Responses: Salinity reductions have been observed in shallow groundwater wells in the vicinity of the RWS. Groundwater data collected from the shallow horizon of several monitoring wells close to the CCS (TPGW-15, TPGW-2S and TPGW-15S) show an overall declining trend in salinity since the start-up of the RWS system (Figure 1) with short term intermittent salinity increases occurring in response to RWS pumping interruptions that occurred from November 11 through November 30, 2018, December 18, 2018 through December 20, 2018, and December 28, 2018 through January 18, 2019. However, in each case the recession of salinity concentration returned once the RWS well operations returned to normal operations.
Florida Power & Light Company 700 Universe Boulevard, Juno Beach, FL 33408
Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 RWS Third Quarter Status Report Tu rkey Point RWS Third Quarter Status Report March 15, 2018 Page 2 of 3 L-201 9-031 Enclosure 7 Page 3 of 4 Salinity in monitoring well TPGW-2S has leveled off since the initial drop immediately following the RWS startup and has remained consistent throughout the third quarter at around 41 PSU. However, the salinity trends observed in these three shallow monitoring wells continue to be significant and consistent with modeled early groundwater responses of the RWS. Salinity levels in other shallow groundwater monitoring wells west ofthe CCS also showed minor reductions in salinity concentrations since RWS operations began on May 15, 2018 although at this time it is not clear whether these changes are related to the operations of the RWS or other factors. No significant changes in salinity from the middle or deep monitoring well horizons have been observed since RWS operations commenced. These data are encouraging and support indications of effectiveness of the RWS reducing the hypersaline plume, despite the short duration of RWS operation. Continuous Surface Electromagnetic Mapping (CSEM) survey data combined with the groundwater monitoring data will be used after the first yea r of RWS operation to provide a more detailed assessment of the RWS impact to the baseline hypersaline groundwater plume.
Salinity levels within the RWS production wells remained stable during the third quarter of operation w ith a combined average of approximately 52 PSU (similar to the first two quarters). This steady trend in hypersalinity is encouraging in demonstrating that the extraction wells are inducing horizontal flow of groundwater into the wells with little downward flow of shallow fresher groundwater.
Shallow Groundwater Salinity Trends from RWS Start Date 50 ~-----------------~
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45 40 RWS-2 Offllne 11/11-30/18 Figure 1: Groundwater salinity trends in monitoring wells near the CCS RWSSystem Offllne 12/18/18-12/20/18 and 12/28/18-1/18/19 TPGW-1S TPGW-2S TPGW-155 Water Level Response: Groundwater and surface water data collected since the beginning of RWS operations indicate t he hypersaline extraction wells are not impacting surface waters or wetlands in t he region. Since the last quarter, the interceptor ditch (ID) pumps have been briefly exercised for maintenance purposes only, but conditions that required ID pump operations did not occur during this reporting period. Accordingly, an evaluation of the cumulative drawdown and assessment of adverse Florida Power & Light Company 700 Universe Boulevard, Juno Beach, FL 33408
Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-251 RWS Third Quarter Status Report Turkey Point RWS Third Quarter Status Report March 15, 2018 Page 3 of 3 L-2019-031 Enclosure 7 Page 4 of 4 impacts to the wetlands from simultaneous pumping of the RWS and ID is not applicable (daily water level data used to determine ID pump operations are located in the FPL EDMS under the 'Interceptor Ditch Operations' tab). However, surface water and shallow groundwater stage responses during RWS system shutoffs and restarts show responses of less than 0.1 ft. in TPGW-155 (located approximately 700 feet from extraction well RWS-2) and no measurable responses in the L-31E canal. These de minimis water level responses are not of a magnitude to impact wetlands or surface waters.
Conclusions Data collected during the third quarter of RWS operations indicate the system is effective in:
removing hypersaline groundwater from the lower portions of the Biscayne aquifer (1.02 billion gallons of hypersaline water containing 403 million pounds of salt removed during the reporting period),
Reducing the extent of the hypersaline groundwater plume west of the CCS as reflected in shallow monitoring wells close to the CCS, Removing hypersaline groundwater without impacting wetlands and surfacewater adjacent to the CCS.
It is likely additional reductions in the extent of the hypersaline plume north and west of the CCS has occurred beyond what has been measured in monitoring wells. CSEM survey results, to be collected after the first year of RWS operation, will provide a more comprehensive assessment of the extent of hypersaline groundwater removal.
FPL appreciates your review of this submittal. Should you have any questions, please contact me (561) 691-7054 or Scott Burns (561) 694-4633.
Sincerely, Kathryn S. Salvador, P.E.
Sr. Director of Environmental Licensing and Permitting CC:
Lee Hefty, DERM Alan Stodghill, FDEP Florida Power & Light Company 700 Universe Boulevard, Juno Beach, FL 33408