ML20272A143

NRC-2020-000123 - Resp 2 - Interim, Agency Records Subject to the Request Are Enclosed. Part 6 of 9

ML20272A143
Person / Time
Site:	Turkey Point
Issue date:	09/24/2020
From:	NRC/OCIO
To:
Shared Package
ML20272A136	List: ML20272A137 ML20272A138 ML20272A139 ML20272A140 ML20272A141 ML20272A142 ML20272A143 ML20272A144 ML20272A145 ML20272A146
References
FOIA, NRC-2020-000123
Download: ML20272A143 (2)

Text

From: Folk, Kevin To: Comar, Manny

Subject:

FW: PTN: Info of Fresh Water lense Date: Tuesday, March 26, 2019 8:11:00 AM From: Folk, Kevin Sent: Tuesday, July 10, 2018 1:00 PM To: Ford, William <William.Ford@nrc.gov>

Subject:

RE: PTN: Info of Fresh Water lense From the 2017 annual monitoring report, p. ES-2 Based on water quality results, vertical profiling, and induction logging, a fresher lens was present during the reporting period in approximately the upper 18 to 20 ft of the aquifer, just west of the CCS, that thickens/increases in depth to over 50 ft at TPGW-7 (over 4.5 miles west of the CCS), eventually extending the full depth of the Biscayne Aquifer. The farthest wells, over 5.5 to 6 miles to the west of the CCS (TPGW-8 and TPGW-9), are still fresh at all

depths, as are the shallow and intermediate wells at TPGW-7.

From: Folk, Kevin Sent: Monday, July 09, 2018 3:00 PM To: Ford, William <William.Ford@nrc.gov>

Subject:

RE: PTN: Info of Fresh Water lense Is this just an oddity in nomenclature by using the term lens?

This still sounds like the saltwater wedge or interface considering the total thickness of the Biscayne at the plant is 115 ft. If the lens is 20 ft and then thickens to the west, this describes perfectly the advance of the salt interface along the deeper portion of the aquifer and matches with groundwater monitoring showing salinity increase with depth in wells.

From: Ford, William Sent: Monday, July 09, 2018 2:52 PM To: Folk, Kevin <Kevin.Folk@nrc.gov>

Subject:

PTN: Info of Fresh Water lense From page ES-3 of 2015 comprehensive uprate report on G Drive.

A shallow, fresh water lens still exists throughout the Model Lands west of the CCS and is supported by the induction logging conducted for this project and the continuous specific conductance profiling done in several historical wells for the interceptor ditch (ID) monitoring. This lens is approximately 10 to 20 feet deep west of the ID canal and thickens towards the west. The persistence of fresh

groundwater immediately west of the hypersaline waters in the CCS is an indication that the ID operations have been successful in preventing westward saline migration from the CCS in the upper portion of the aquifer.

Bill Ford 301-415-1263