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HomeMy WebLinkAboutWSPN BG GW Final Dec 2016_20161215TECHNICAL MEMORANDUM Date: December 15, 2016 File: 1026.109.19 To: Ryan Czop (Duke Energy) Cc: Kathy Webb (Syq ra From: Ted Volska� Y Subject: Quantification of Valid Background Groundwater Data - W.H. Weatherspoon Power Plant Proposed Preliminary Background Threshold Values (PPBTVs) for groundwater will be calculated for CAMA assessment constituents identified with concentrations greater than the 2L or IMAC at the W. H. Weatherspoon Power Plant (Site). A summary of background well analytical results was originally presented in the Weatherspoon Corrective Action Plan Part 1 submitted on November 2, 2015 and updated in the CSA Supplement 1 submitted July 7, 2016. Table 1 provides a summary of existing background well data for each flow system and indicates which samples are considered for use in statistical calculations to determine concentrations of naturally occurring (background) inorganic constituents in groundwater. Additional sampling has been conducted since August 2016 that can be used to augment the dataset provided herein once available. The following discussion quantifies the number of valid results to date within each flow zone. BACKGROUND WELL DATA ANALYSIS The current background monitoring well network consists of wells installed within three flow zones; surficial groundwater (upper unconfined), Lower Yorktown formation (lower unconfined), and Pee Dee aquifer (first confined). Samples from these wells must meet the following criteria to be considered valid for determining PPBTVs: 47 Sample pH is less than or equal to (<) 8.5 standard units (S.U.); Sample turbidity is less than or equal to (<) 10.0 Nephelometric Turbidity Units (NTUs); and 47" Result is not a statistical outlier identified for background sample data collected through April 2016 (SynTerra, July 7, 2016; CSA Supplement 1). Professional judgement can be used to retain data that does not meet these criteria (such as pH); however, the decision to retain data that does not satisfy these criteria must be documented. For Weatherspoon, there are no exceptions to the valid groundwater sample criteria. SURFICIAL GROUNDWATER Background wells screened in surficial groundwater are: 10 MW-1 ,7 CCR-101-BG `7 BW-1 167 BW-2S `1 BW-3S P: \ Duke Energy Progress.1026 \ 109. Weatherspoon Ash Basin GW Assessment Plan\ 19.EG_CSASUP \ Statistics \ Background GW Stats - Dec 2016\ Weatherspoon - Valid Background GW Samples (12-15).docx Quantification of Valid Background Groundwater Data December 15, 2016 W. H. Weatherspoon Power Plant Page 2 of 3 Surficial groundwater wells MW-1 and BW-1 were installed in December 1989 and August 2010, respectively. Well BW-1 is the National Pollution Discharge Elimination System (NPDES) compliance monitoring background well. Both wells were installed between the ash basin to the east and a former auto salvage yard to the west (Figure 1). Statistical analyses will be conducted on BW-1 and MW-1 groundwater data to determine whether water quality at either well has been influenced by anthropogenic sources. For the purposes of this technical memo, these wells are considered background wells. If the statistical analyses indicate that either well is influenced by anthropogenic sources, the data from these wells will not be used in the calculation of PPBTVs. Surficial Groundwater Background Wells MW-1, BW-1, BW-2S, BW-3S and CCR-101-BG As indicated by the sample count shown on Table 1, the minimum number of valid background samples necessary to conduct statistical analysis is satisfied for all parameters. This assessment does not take into consideration the potential for statistical outliers for samples collected since August 2016. Surficial Groundwater Background Wells MW-1, BW-2S, BW-3S and CCR-101-BG As indicated by the sample count shown on Table 1, the minimum number of background data necessary to conduct statistical analysis is satisfied for all parameters. This assessment does not take into consideration the potential for statistical outliers for samples collected since August 2016. Surficial Groundwater Background Wells BW-2S, BW-3S and CCR-101-BG As shown by the sample counts in Table 1, the minimum number of valid background samples necessary to run statistics is satisfied for some but not all parameters. At least two more sampling events will be necessary to collect the minimum number of samples to calculate PPBTVs for the radium and uranium constituents. Surficial groundwater was most recently sampled during the second week of December 2016. Data from this sampling event is not included in Table 1. It is projected that the minimum number of background data necessary to conduct statistical analysis on the radium and uranium constituents would be achieved in February 2017 based upon a two month sampling frequency. This projection does not take into consideration the potential for statistical outliers for samples collected since August 2016. LOWER YORKTOWN GROUNDWATER Two background wells (BW-2I and BW-3I) are screened in the Lower Yorktown formation. The Lower Yorktown background data set does not satisfy the requirements for the minimum number of samples to conduct statistical analysis for all constituents. It is projected that the minimum number of background data necessary to conduct background statistical analysis for radium and uranium constituents will be achieved in August 2017 based upon a two month P: \Duke Energy Progress.1026\109. Weatherspoon Ash Basin GW Assessment Plan\ 19.EG_CSASUP\Statistics\Background GW Stats - Dec 2016 \ Weatherspoon - Valid Background GW Samples (12-15).docx Quantification of Valid Background Groundwater Data December 15, 2016 W. H. Weatherspoon Power Plant Page 3 of 3 sampling frequency. This projection does not take into consideration the potential for statistical outliers for samples collected since August 2016. Groundwater samples eliminated from the background data set include: 47, Elevated turbidity in 7 out of 8 BW-2I samples. 47, Elevated turbidity in 3 out of 7 BW-3I samples. PEE DEE GROUNDWATER Two background wells (BW-2D and BW-3D) are screened in the Pee Dee aquifer. The Pee Dee background data set does not satisfy the requirements for the minimum number of samples to conduct statistical analysis for all constituents. It is projected that the minimum number of background data necessary to conduct background statistical analysis for radium and uranium constituents will be achieved in August 2017 based upon a two month sampling frequency. This projection does not take into consideration the potential for statistical outliers for samples collected since August 2016. Two BW-2D groundwater samples were eliminated from the background data set due to elevated pH (Table 1). ATTACHMENTS: Table 1: Background Analytical Results through September 2016 Figure 1: Background Monitoring Well Locations P: \Duke Energy Progress.1026\109. Weatherspoon Ash Basin GW Assessment Plan\ 19.EG_CSASUP\Statistics\Background GW Stats - Dec 2016 \ Weatherspoon - Valid Background GW Samples (12-15).docx TABLE 1 BACKGROUND ANALYTICAL RESULTS THROUGH 2O16-09 W.H. WEATHERSPOON POWER PLANT DUKE ENERGY PROGRESS, LLC, LUMBERTON, NC Analytical Parameter pH Turbidity Arsenic Barium Beryllium Boron Cadmium Calcium Chloride Chromium (VI) Chromium Cobalt iron Lead Manganese Molybdenum Nickel Nitrate + Nitrite Selenium Strontium Sulfate Thallium Total Dissolved Solids Vanadium Zinc Radium-226 Radium-228 Uranium-233 Uranium-234 Uranium-236 Uranium-238 Reporting Units S.U. NTUs ug/L ug/L ug/L ug/L ug/L mg/L mg/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L mg-N/L ug/L ug/L mg/L ug/L mg/L ug/L ug/L pCi/L pCi/L ug/mL ug/mL ug/mL ug/mL 15A NCAC 02L Standard 6.5-8.5 NE 10 700 4* 700 2 NE 250 0.07^ 10 1* 300 15 50 NE 100 10 20 NE 250 0.2* 500 0.3* 5000 NE NE NE NE NE NE Sample ID Sample Collection Date Field Parameters Analytical Results Surficial BW-1 11/16/2010 4.5 4.5 15 114 NA NA 0.22 NA 21 NA NA NA 1390 <5 NA NA <5 NA <10 NA 42.6 0.11 113 NA <10 NA NA NA NA NA NA 3W-1 03/01/2011 4.2 6.28 <5 100 b NA <50 0.26 NA 36.4 b NA <5 NA 2040 <5 20.7 NA <5 NA <10 NA 56.3 <0.1 222 b NA 21.2 b NA NA NA NA NA NA 3W-1 06/07/2011 4.3 1.25 <5 109 NA 59.9 0.39 NA 6.2 NA <5 NA 87.9 <5 33.4 NA <5 NA <10 NA 17.6 0.14 96 NA <10 NA NA NA NA NA NA BW-1 10/03/2011 4.6 0.58 <5 84.8 NA 86.8 0.23 NA 13.5 NA <5 NA 643 <5 26.6 NA <5 NA <10 NA 35.5 0.12 92 NA <10 NA NA NA NA NA NA BW-1 03/05/2012 4.2 0.58 <5 96.3 NA <50 0.32 NA 30 NA <5 NA 591 <5 17.8 NA <5 NA <10 NA 56.5 0.1 209 NA 17.7 NA NA NA NA NA NA BW-1 06/04/2012 4.1 2.2 <5 68.4 NA 52.6 <0.08 NA 8.7 NA <5 NA <50 <5 29.5 NA <5 NA <10 NA 38.8 0.66 92 NA <10 NA NA NA NA NA NA BW-1 10/01/2012 4.3 0.53 <5 60.6 NA 58.3 0.31 NA 7.9 NA <5 NA <50 <5 28.2 NA <5 NA <10 NA 35.9 0.14 86 NA <10 NA NA NA NA NA NA 3W-1 03/11/2013 3.9 2.78 <1 81 NA <50 <1 NA 19 NA <5 NA 143 1.4 14 NA <5 NA 1.15 NA 56 <0.2 150 NA 23 NA NA NA NA NA NA BW-1 06/11/2013 4.0 1.72 <1 61 NA 69 <1 NA 7.1 NA <5 NA 44 <1 29 NA <5 NA 2.07 NA 37 <0.2 85 NA 8 NA NA NA NA NA NA 3W-1 10/01/2013 4.2 9.9 1.05 83 NA <50 <1 NA 16 NA <5 NA 392 <1 27 NA <5 NA 1.06 NA 40 <0.2 110 NA <5 NA NA NA NA NA NA BW-1 03/06/2014 3.9 0.52 <1 86 NA <50 3.2 NA 34 NA <5 NA 657 1.35 16 NA <5 NA <1 NA 58 <0.2 170 NA 13 NA NA NA NA NA NA BW-1 06/04/2014 4.0 1.1 1.18 81 NA <50 <1 NA 33 NA <5 NA 2140 1.56 13 NA <5 NA <1 NA 56 <0.2 170 NA 15 NA NA NA NA NA NA BW-1 10/03/2014 4.3 3.31 <1 49 NA 74 <1 NA 8.1 NA <5 NA 283 1.1 22 NA <5 NA 1.92 NA 36 <0.2 82 NA <5 NA NA NA NA NA NA BW-1 03/09/2015 4.1 2.88 <1 63 NA <50 <1 NA 13 NA <5 NA 162 1.14 10 NA <5 NA <1 NA 51 <0.2 130 NA 14 NA NA NA NA NA NA BW-1 06/02/2015 4.4 4.86 <1 56 <1 67 <1 5.13 7.1 NA <5 <1 253 1.1 24 <1 <5 1.4 1.42 <1000 47 <0.2 87 5.09 <5 NA NA NA NA NA NA BW-1 10/14/2015 4.2 0.46 <1 69 <1 70 <1 5.75 6.2 NA <5 <1 39 1.13 32 <1 <5 NA 1.65 28 59 0.302 96 2.98 9 NA NA NA NA NA NA BW-1 12/02/2015 4.2 6.01 <1 81 <1 62 <1 5.03 19 0.056 2.2 <1 313 2.22 35 <1 1.22 0.682 1.5 40 57 <0.2 130 6.81 16 NA NA NA NA NA NA BW-1 01/11/2016 3.7 1.41 <1 55 <1 60 <1 1.9 13 0.08 2.33 <1 124 1.37 9 <1 <1 <0.01 <1 21 46 <0.2 110 7.24 19 NA NA NA NA NA NA 3W-1 04/20/2016 4.1 3.58 <1 58 <1 <50 <1 2.12 9.2 NA <5 <1 482 1.12 12 <1 <5 NA <1 18 35 <0.2 86 6.66 13 NA NA NA NA NA NA BW-1 06/13/2016 4.1 4.09 1.17 60 <1 57 <1 1.94 11 <0.03 <5 <1 954 1.38 15 <1 <5 0.037 <1 20 29 <0.2 130 11.5 18 3.35 2.54 <0.00005 <0.00005 <0.00005 0.000507 BW-1 08/31/2016 4.3 4.87 <1 54 <1 70 <1 4.93 7.6 0.031 2.14 <1 185 1.01 19 <1 <1 0.153 1.1 29 40 <0.2 100 6.25 <5 1.88 3.9 <0.00005 <0.00005 <0.00005 0.000404 8W-2S 0310612015 6.3 216 2.39 38 <1 <50 <1 44.2 7.8 NA 8.61 <1 2570 7.85 31 1.32 2.17 <0.01 1.67 146 9A <0.2 260 18.4 <5 NA NA NA NA NA NA SW-2S 0610412025 NM NM NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0.88 1.95 <0.00005 <0.00005 <0.00005 0,00332 BW-2S 0610512015 5.1 >1000 3.93 96 <1 <50 <1 4.08 7 NA 25.9 <1 6420 42.1 25 3.64 2.9 0.032 5.54 39 8.5 <0.2 520 47.3 10 NA NA NA NA NA NA SW-2S 0913012015 5.0 29 <1 27 <1 <50 <1 3.87 NA NA 1.54 <1 2150 1.09 19 <1 <1 NA <1 19 NA <0.2 NA 4.08 <5 NA NA NA NA NA NA BW-2S 12/02/2015 9.8 34.6 <1 31 <1 <50 <1 2.79 7.2 0.063 1.42 <1 1240 1.66 15 <1 <1 <0.01 <1 18 7.5 <0.2 62 4.42 15 NA NA NA NA NA NA BW-2S 01/12/2016 4.7 9.58 <1 24 <1 <50 <1 3.53 7.6 <0.03 <1 <1 1670 <1 17 <1 <1 0.05 <1 19 8.6 <0.2 46 3.08 <5 NA NA NA NA NA NA BW-2S 0310712016 5.6 61 1.46 22 <1 <50 <1 14.6 7.3 0.032 2.51 <1 2750 2.17 31 <I <I 0.632 <1 36 7.9 <0.2 110 5.08 <5 3.06 <3 <0.00005 <0.00005 <0.00005 0.000393 BW-2S 06/13/2016 4.8 8.2 <1 22 <1 <50 <1 3.53 6.7 B2 <0.03 <1 <1 1520 <1 11 <1 <1 <0.01 <1 19 8.2 <0.2 79 1.85 <5 2.86 2.12 <0.00005 <0.00005 <0.00005 0.000345 BW-2S 08/31/2016 4.4 1.46 <1 27 <1 <50 <1 2.45 6.9 <0.03 <1 <1 970 <1 9 <1 <1 <0.01 <1 17 8.3 <0.2 36 1.63 <5 6.42 4.42 <0.00005 <0.00005 <0.00005 0.0000816 j BW-3S 0310512015 5.4 14.3 <1 19 <1 <50 <1 3.15 16 NA 1.98 <1 5240 <I 46 <1 <1 0.015 <1 21 5.3 <0.2 69 3.44 8 NA NA NA NA NA NA BW-3S 0610312015 5.5 19.5 <1 20 <1 <50 <1 3.1 13 NA 2.18 <1 4490 <I 40 <I <1 0.01 <I 21 9.1 <0.2 75 3.68 <5 NA NA NA NA NA NA BW-3S 09/30/2015 5.2 7.89 <1 17 <1 <50 <1 2.4 NA NA 1.71 <1 3210 <1 33 <1 <1 NA <1 16 NA <0.2 NA 3.44 <5 NA NA NA NA NA NA BW-3S 12/02/2015 5.3 5.14 <1 19 <1 <50 <1 3.02 16 0.049 1.44 <1 4100 <1 36 <1 <1 <0.01 <1 21 7.5 <0.2 74 2.63 <5 NA NA NA NA NA NA BW-3S 01/11/2016 5.1 2.25 <1 20 <1 <50 <1 3.1 18 0.047 1.59 <1 3920 <1 45 <1 <1 0.037 <1 21 10 <0.2 60 2.95 <5 NA NA NA NA NA NA BW-3S 03/07/2016 5.4 2.9 <1 17 <1 <50 <1 2.9 12 0.037 1.61 <1 3540 <3 39 <1 <1 <0.01 <1 20 7.5 <0.2 70 2.82 <5 1.79 <3 <0.00005 <0.00005 <0.00005 0.000157 j BW-3S 06/13/2016 5.5 4.08 <1 18 <1 <50 <1 2.85 11 B2 <0.03 1.59 <1 3670 <1 36 <1 <1 <0.01 <1 19 8.6 <0.2 71 2.82 <5 1.74 <1 <0.00005 <0.00005 <0.00005 0.000173 j BW-3S 0813112016 5.4 10.8 <1 17 <1 <50 <1 2.38 9.9 <0.3 D3 1.71 <1 2870 <1 25 <1 <1 <0.01 <I 16 3.5 <0.2 56 3.24 <5 <1 0.727 <0.00005 <0.00005 <0.00005 0.000279 CCR-101-BG 06/14/2016 6.1 4.11 3.25 18 <1 <50 <1 16.2 3.3 B2 <0.03 <1 <1 391 <1 16 <1 <1 0.015 <1 92 1.6 <0.2 46 0.797 <5 1.76 0.972 <0.00005 <0.00005 <0.00005 0.000325 CCR-101-BG 08/30/2016 6.0 1.23 1.59 18 <1 <50 <1 13.6 4.3 <0.03 <1 <1 357 <1 15 <1 <1 0.139 <1 88 1.3 <0.2 56 <0.3 <5 4.56 <1 <0.00005 <0.00005 <0.00005 0.0001031 MW-1 0311911990 6.4 NM NO 10 NA NA NO NA NA NA NA NA 180 NO NA NA NA NA NO NA 13 NA 10 NA NA NA NA NA NA NA NA MW-1 0710511990 6.3 NM NO 10 NA NA NO NA NA NA NA NA 140 NO NA NA NA NA NO NA 9.2 NA 56 NA NA NA NA NA NA NA NA MIN-1 1110511990 7.0 NM NO NO NA NA NO NA NA NA NA NA 90 NO NA NA NA NA NO NA 15 NA 44 NA NA NA NA NA NA NA NA M W-1 03/06/1991 7.4 NM NO NO NA NA 0.1 NA NA NA NA NA 300 1.4 NA NA NA NA NO NA 17 NA 130 NA NA NA NA NA NA NA NA MW-1 0710111991 5.8 NM I NO NA NA NO NA NA NA NA NA 500 NO NA NA NA NA NO NA 10 NA 110 NA NA NA NA NA NA NA NA MW-1 11/06/1991 6.0 NM NO NO NA NA 0.4 NA NA NA NA NA 360 3.9 NA NA NA NA NO NA 7.3 NA 60 NA NA NA NA NA NA NA NA MIN-1 0310211992 7.2 NM 1 10.6 NA NA 0.8 NA NA NA NA NA NO NO NA NA NA NA NO NA 11 NA 58 NA NA NA NA NA NA NA NA MW-1 0710711992 4.9 NM NO 7 NA NA 0.3 NA NA NA NA NA 230 NO NA NA NA NA NO NA 10 NA 40 NA NA NA NA NA NA NA NA MW-1 1110411992 5.6 NM <1 <5 NA NA <0.1 NA NA NA NA NA <50 <I NA NA NA NA <1 NA 6.7 NA 64 NA NA NA NA NA NA NA NA MW-1 03/10/1993 5.0 NM 1 13 NA NA <0.1 NA NA NA NA NA 2300 <1 NA NA NA NA <1 NA 10 NA 38 NA NA NA NA NA NA NA NA MIN-1 0711211993 7.5 NM 1 12.6 NA NA <0.1 NA NA NA NA NA 3000 <1 NA NA NA NA 1 NA IS NA 39 NA NA NA NA NA NA NA NA MW-1 11/08/1993 5.1 NM 1 11 NA NA <0.1 NA NA NA NA NA Soo <1 NA NA NA NA <1 NA 8.7 NA 44 NA NA NA NA NA NA NA NA MW-1 0310711994 4.5 NM <1 20 NA NA 0.2 NA NA NA NA NA 1100 <I NA NA NA NA <1 NA 12 NA 36 NA NA NA NA NA NA NA NA MW-1 07/12/1994 7.1 NM <1 <20 NA NA <0A NA NA NA NA NA 4700 <I NA NA NA NA <1 NA 7.8 NA 32 NA NA NA NA NA NA NA NA MW-1 1013111994 4.8 NM <1 13 NA NA <0.1 NA NA NA NA NA 17000 <I NA NA NA NA <1 NA 7.9 NA 35 NA NA NA NA NA NA NA NA MIN-1 0310711995 5.7 NM <1 <10 NA NA <0.1 NA NA NA NA NA 6700 <5 NA NA NA NA <1 NA 8.1 NA 32 NA NA NA NA NA NA NA NA MW-1 0711111995 5.9 NM 4 17 NA NA <0.1 NA NA NA NA NA 18000 <1 NA NA NA NA <1 NA 11 NA 56 NA NA NA NA NA NA NA NA MW-1 03/05/1996 5.8 NM 2.4 NA NA NA 0.8 NA NA NA NA NA 1900 4 NA NA NA NA <1 NA NA NA 523 NA NA NA NA NA NA NA NA MW-1 0311811997 5.6 NM 1.8 NA NA NA <0.5 NA NA NA NA NA 9800 2 NA NA NA NA <1 NA NA NA NA NA NA NA NA NA NA NA NA MW-1 03/09/1998 5.0 NM <3 NA NA NA <0.5 NA NA NA NA NA 3700 <2 NA NA NA NA <3 NA NA NA NA NA NA NA NA NA NA NA NA MW-1 1211312006 4.5 NM 0.12 14.4 <0.051 16.4 0.024 NA 2.1 NA 0.23 NA 536 0.16 7.7 NA 0.43 NA 0.17 NA 3.36 0.051 10 NA 1.4 NA NA NA NA NA NA MW-1 0311412007 4.5 NM 12 11 11 11 <1 NA 3 NA <5 NA 1270 13 1 8 NA <5 NA <5 NA 5 <1 22 NA <5 NA NA NA I NA NA NA P:\Duke Energy Progress.1026\109. Weathempoon Ash Basin GW Assessment Plan\19.EG_CSASUP\Statistics\Background GW Stats - Dec 2016\Table 1 - Weatherspoon Background Groundwater Analytical Results Through August 2016 Pa e 1 Of 2 TABLE 1 BACKGROUND ANALYTICAL RESULTS THROUGH 2O16-09 W.H. WEATHERSPOON POWER PLANT DUKE ENERGY PROGRESS, LLC, LUMBERTON, NC Analytical Parameter pH Turbidity Arsenic Barium Beryllium Boron Cadmium Calcium Chloride Chromium (VI) Chromium Cobalt Iron Lead Manganese Molybdenum Nitrate + Nitrite Selenium Strontium Sulfate Thallium Total Dissolved Solids Vanadium Zinc Radium-226 Radium-228 Uranium-233 Uranium-234 Uranium-236 Uranium-238 Reporting Units S.U. NTU. ug/L ug/L ug/L ug/L ug/L mg/L mg/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L LNickel mg-N/L ug/L ug/L mg/L ug/L mg/L ug/L ug/L pCi/L pCi/L ug/mL ug/mL ug/mL ug/mL 15A NCAC 02L Standard 6.5-8.5 NE SO 700 4* 700 2 NE 250 0.07- SO 1* 300 15 50 NE 10 20 NE 250 0.2* Soo 0.3* 1000 NE NE NE NE NE NE Sample ID Sample Collection Data Field Parameters Analytical Results My/_1 1111312007 4.5 NM 12 14 <1 22 <1 NA 7 NA 15 NA 401 <5 <5 NA <5 NA <5 NA 24 <1 52 NA 30 NA NA NA NA NA NA MW-1 0311812008 3.8 NM <5 13 <1 20 12 NA 5 NA 5 NA 313 <3 <5 NA <5 NA <5 NA 8 <5 33 NA 12 NA NA NA NA NA NA MW-1 1111112008 4.1 NM <2 13 <1 8 <1 NA 3 NA <5 NA 414 12 1 NA 15 NA <1 NA <10 <1 63 NA 25 NA NA NA NA NA NA MW-1 03/24/2009 4.0 NM <1 9 <1 45 <1 NA 4 NA 5 NA 408 2 6 NA 1 NA <1 NA <5 <1 35 NA 23 NA NA NA NA NA NA MW-1 1011512009 4.1 NM <1 10 <1 17.2 <1 NA 7 NA 4 NA 1520 2 6 NA 2 NA <1 NA 7 <1 25 NA 9 NA NA NA NA NA NA MW-1 0311712010 3.8 NM <1 7 <1 13 <1 NA <5 NA 4 NA 1400 <1 4 NA <1 NA <1 NA 6 <1 9 NA <1 NA NA NA NA NA NA MW-1 06/05/2015 4.0 3.43 <1 9 <1 <50 I <1 1.09 2.1 NA <1 <1 323 1 <1 1 10 <1 <1 1 1.2 <1 9 5 <0.2 I <25 <0.3 <5 NA NA NA NA NA NA MW-1 12/O1/2015 4.6 3.59 <1 10 <1 <50 <1 1.01 2.4 <0.03 <1 <1 66 <1 8 <1 <1 1.1 <1 8 5.6 <0.2 <25 <0.3 <5 NA NA NA NA NA NA MW-1 01/11/2016 4.1 2.68 <1 11 <1 <50 <1 0.971 2.4 <0.03 <1 <1 223 <1 11 <1 <1 1.2 <1 9 4.3 <0.2 <25 <0.3 10 NA NA NA NA NA NA MO-1 06/14/2016 4.7 3.62 <1 9 <1 <50 <1 1.22 1.7 B2 <0.03 <1 <1 313 <1 10 <1 <1 1.6 <1 10 3.8 <0.2 <25 <0.3 <5 1.82 1.92 <0.00005 <0.00005 <0.00005 <0.0002 MW-1 08/30/2016 4.5 2.81 <1 28 <1 <50 <3 1.2 1.8 0.042 <1 <1 94 <1 30 <1 <1 1.7 <1 27 3.9 <0.2 <25 <0.3 23 2.37 2.85 <0.00005 <0.00005 <0.00005 0.000105j Total Count of Valid Samples including BW-1 and MW-1 36 36 36 36 22 35 36 22 35 17 35 22 36 36 35 22 36 26 36 22 35 36 35 22 36 10 10 10 SO 10 10 Total Count of Valid Samples Excluding BW-1 15 15 15 15 15 15 15 15 14 13 15 15 15 15 15 15 15 21 15 35 14 15 14 15 15 8 8 8 8 8 8 Total Count of Valid Sample Excluding BW-1 and MW-1 10 10 10 10 10 10 10 10 9 9 l0 10 10 10 10 10 10 16 10 10 9 l0 9 10 10 6 6 6 6 6 6 Lower Yorktown BW-21 0310512015 7.0 89.9 1.8 26 <I <50 <I 50.4 4.6 NA 7.08 <1 2090 1.29 35 11 <1 <0.01 3.16 229 13 <0.2 200 8.88 7 NA NA NA NA NA NA BW-21 0610412015 7.3 413 3.89 53 1.19 <50 <1 45.6 4.4 NA 30.8 1.31 7850 8.99 50 12.5 2.89 0.021 1.09 255 2.1 <0.2 440 36.6 19 NA NA NA NA NA NA BW-2I 09/30/2015 7.7 9.99 1.01 26 <1 <50 <1 42.8 NA NA 7.81 <1 882 1.63 22 9.33 <1 NA <1 233 NA <0.2 NA 11.4 <5 NA NA NA NA NA NA BW-21 1210212015 7.3 710 6.5 81 2A1 74 <3 45.3 4.8 0.44 67 2.63 12600 20.9 64 12.8 6.03 0.05 2.08 272 0.26 <0.2 970 79 29 NA NA NA NA NA NA BW-21 0111212016 7.2 320.8 4.21 42 <I 54 <1 42.2 4.7 0.18 26.1 1.53 5690 10.5 47 9.09 3.26 0.429 <1 223 0.24 <0.2 320 33.7 977 NA NA NA NA NA NA BW-21 0310712016 7.2 346 4.26 42 <1 <50 <1 42.8 4.1 0.18 21.4 1.53 6030 10.1 47 6.73 3.17 0.504 <I 231 <0.1 <0.2 360 27.9 22 2.24 <3 <0.00005 <0.00005 <0.00005 0.00973 BW-21 0611312016 7.4 312 2.91 34 <1 <50 <1 45.3 4.6 B2 <0.3 D3 14.7 1.18 4550 8.83 41 5.55 2.44 1 0.042 <1 232 1.5 <0.2 230 18.8 14 3.04 0.989 <0.00005 <0.00005 1 <0.00005 0.00884 BW-21 08/31/2016 7.3 24.6 <1 15 <3 <50 <3 43 4.4 <0.09 D3 2.34 <1 1340 <1 27 2.63 <1 0.033 <1 227 0.67 <0.2 210 3.78 1 <5 1.36 <1 <0.00005 <0.00005 <0.00005 0.00261 BW-31 0310412015 5.8 58.3 9.07 31 <1 <50 I <3 9.25 9.2 NA 2.78 <i 1 5790 <1 60 1.08 <1 <0.02 <3 51 0.41 <0.2 86 5.69 6 NA NA NA NA NA NA BW-31 06/03/2015 5.7 20.7 <3 19 <1 <50 <1 7.67 5.8 NA 1.16 <1 2280 <1 21 <1 <1 <0.01 <1 41 0.12 <0.2 57 2.46 <5 NA NA NA NA NA NA BW-31 1210212015 5.5 24.5 <3 20 <1 <50 <1 6.23 11 0.047 1,18 <I 2200 <1 19 <1 <1 <0.01 <i 36 0.89 <0.2 72 2.57 <5 NA NA NA NA NA NA BW-31 O1/11/2016 5.5 9.92 <1 23 <1 <50 <1 7.87 12 <0.03 <1 <1 1720 <1 19 <1 <1 <0.01 <1 48 0.18 <0.2 47 2.04 <5 NA NA NA NA NA NA BW-31 03/07/2016 5.6 9.86 <1 21 <1 <50 <1 7.02 10 0.049 1.34 <1 2070 <1 20 <1 <1 <0.01 <1 41 1.3 <0.2 75 2.61 <5 1.72 3.68 <0.00005 <0.00005 <0.00005 0.000434 BW-31 06/13/2016 5.7 5.5 <1 17 <1 <50 <3 6.84 6.1 B2 <0.03 <1 <1 1260 <1 12 cl <1 0.038 <1 38 <0.5 <0.2 60 1.85 <5 1.13 0.461 <0.00005 <0.00005 <0.00005 0.0009 BW-3[ 08/31/2016 5.7 4.27 <1 16 <1 <50 <1 6.3 5.7 <0.03 <1 <1 11So <1 12 <1 <1 <0.01 M2 <1 36 <0.1 <0.2 53 1.63 <5 2.84 <1 <0.00005 <0.00005 <0.00005 0.000491 Total Count of Valid Samples 5 5 5 5 5 5 5 5 4 4 5 5 5 5 5 5 5 4 5 5 4 5 4 5 5 3 3 3 3 3 3 Pee Dee BW-2D 0310512015 12.5 4.55 <I 121 <I <50 <I 352 3.1 NA 24.5 <I 17 <I <5 5.95 <I <0.01 1.4 1100 3.8 <0.2 740 4.75 73 NA NA NA NA NA NA BW-2D 0610312015 11.5 2 1.01 50 <i <50 <1 55.4 4.4 NA 1.32 <I <10 <I <5 4.99 <1 <0.01 <1 454 7.2 <0.2 240 19.3 <5 NA NA NA NA NA NA BW-3D 03/05/2015 7.2 6.19 <1 51 <1 <50 <1 29.2 3 NA <1 <1 721 <1 31 <1 <1 <0.01 <1 157 0.53 <0.2 110 <0.3 11 NA NA NA NA NA NA BW-3D 06/03/2015 7.3 2.3 <1 45 <1 <50 <1 27.7 3.2 NA <1 <1 1090 <1 41 2.05 <1 <0.01 <1 156 0.21 <0.2 120 <0.3 <5 NA NA NA NA NA NA BW-313 12/02/2015 7.3 0.48 <3 52 <1 <50 <1 30 3.3 <0.03 <1 <1 1550 <1 39 <1 <1 <0.01 <1 164 <0.1 <0.2 110 <0.3 <5 NA NA NA NA NA NA BW-3D O1/11/2016 6.6 1 <1 56 <1 <50 <1 27.2 3.5 0.076 <1 <1 837 <1 25 <1 <1 0.05 <1 156 0.16 <0.2 110 <0.3 <5 NA NA NA NA NA NA BW-3D 23/07/2016 7.2 1 1.34 <1 56 1 <1 1 <50 <1 26.7 1 3.2 1 <0.03 <1 <1 1 1040 <1 27 <1 I <1 <0.01 <1 162 0.17 <0.2 120 <0.3 <5 12.71 1<3 1<0.00005 1 <0.00005 1 <0.00005 <0.0002 BW-3D 06/13/2016 7.2 0.39 <1 52 <1 <50 <1 28.4 3.4 B2 <0.03 <1 <1 1250 11 27 <1 <1 <0.01 <1 156 0.12 <0.2 130 <0.3 <5 2.55 <1 .0.00005 <0.00005 <0.00005 <0.0002 BW-3D 08/31/2016 7.1 2.58 <1 52 <1 <50 <1 27.5 3.2 <0.03 <1 <1 1220 <1 28 11 <1 0.11 <1 158 0.14 <0.2 110 <0.3 <5 1.76 <1 <0.00005 <0.00005 <0.00005 <0.0002 Total Count of Valid Samples 7 7 7 7 7 7 7 7 7 5 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 3 3 3 3 3 3 Prepared by: VTV Checked by: ZHG Notes: Red text indicates samples not used in determination of provisional preliminary background threshold values (PPBTVs) - eliminated due to pH > 8.5 or turbidity >10 NTU or or pH and/or turbidity not measured = Bald highlighted concentration indicates exceedance of the 15A NCAC 02L .0202 Standard, the IMAC, or the NC DHHS Screening Level for chromium VI. (Effective date for 15A NCAC 02L .0202 Standard and IMAC is April 1, 2013) _ = Value eliminated as outlier (through April 2016 analytical results) NTU = Nephelometric turbidity unit mg/L = Milligram per liter ND = Not Detected ug/L = Microgram per liter pCi/I = picocuries per liter mg - N/L = Milligram nitrogen per liter S.U. = Standard Unit NA = Not analyzed NM = Not measured = NC DHHS Health Screening Level. < = Concentration not detected at or above the reporting limit * = Interim Maximum Allowable Concentrations (IMACs) of the 15A NCAC 02L Standard, Appendix 1, April 1, 2013. B = Target analyte detected in method blank at or above the reporting limit. Target analyte concentration in sample is less than 1OX the concentration in the method blank. Analyte concentration in sample could be due to blank contamination. B2 = Target analyte was detected in blank(s) at a concentration greater than 1/2 the reporting limit but less than the reporting limit. Analyte concentration in sample is valid and may be used for compliance purposes. D3 = Sample was diluted due to the presence of high levels of non -target analytes or other matrix Interference. j = Estimated concentration above the adjusted method detection limit and below the adjusted reporting limit. P:\Duke Energy Progress.1026\109. Weathempoon Ash Basin GW Assessment Plan\19.EG_CSASUP\Statistics\Background GW Stats - Dec 2016\Table 1 - Weatherspoon Background Groundwater Analytical Results Through August 2016 Pa e 2 Of 2 r BW-3S � BW-31 BW-3D LEGEND 9 BW 3S SURFICIAL GROUNDWATER BACKGROUND WELL 9 BW 31 LOWER YORKTOWN FORMATION BACKGROUND WELL 9 BW 3D PEE DEE AQUIFER BACKGROUND WELL DUKE ENERGY PROGRESS PARCEL LINE (APPROXIMATE) CCR SURFACE IMPOUNDMENT COMPLIANCE BOUNDARY CCR SURFACE IMPOUNDMENT WASTE BOUNDARY NPDES TREATMENT UNIT COMBINED COMPLIANCE BOUNDARY 1993 AERIAL PHOTOGRAPHY OBTAINED FROM THE USGS EARTH EXPLORER WEB SITE BW-2S • BW-21 mf BW-2 D AUTO SALVAGE YARD / CCR-101-BG *�,'.Yl rl ri 3V - FB -W --lj B ,,Ip I �P ` ASH BASIN offs ►[eT14P► GRAPHIC SCALE 250 0 250 500 IN FEET 148 RIVER STREET, SUITE 220 GREENVILLE, SOUTH CAROLINA 29601 PHONE 864-421-9999 www.synterracorp.com Terra DRAWN BY: JE GER:TCOLEMANDV DATE PRINTED 2016 ft.), \ PROJECT MANAGER: TED ELLS 11 DATE PRINTED: /7� � LAYOUT: BACKGROUND WELLS 11X17 12/13/2016 9:29 AM P:\Duke Energy Ro ress.1026\109. Weathersp— Ash Basin GW A: FIGURE 1 BACKGROUND MONITORING WELL LOCATIONS W. H. WEATHERSPOON POWER PLANT LUMBERTON, NORTH CAROLINA 'Ian\OO.ALL WELL MAP\TECH MEMO TED CARS.dwg