1

Questions for Keystone – 6/17/2014

Data provided on 5/16/2014

1. We identified a couple discrepancies between the RL and dilution factor values reported in the 

analytical spreadsheet, when compared to the RL and dilution factor values cited in the lab report

for total mercury (see Table 1). Please confirm which RL and dilution factor is correct for these 

data samples. The RLs for these two samples are reported as identical in the two laboratory 

reports; however, the laboratory reports have a 500-fold difference in the reported dilution factor. 

Table 1. Dilution Factor Discrepancies between Analytical Spreadsheet and Lab Reports for 

Mercury

Date Units Amount MDL

RL (from 

Spreadsheet)

RL 

(from 

Lab 

Report)

DF (from 

Spreadsheet)

DF 

(from

Lab 

Report) Sample Point

6-Jan-14 mg/L 0.52 0.0005 0.001 0.1 5 500 FGD Influent (SP-1)

13-Jan-14 mg/L 0.505 0.0005 0.001 0.1 5 1 FGD Influent (SP-1)

Original data submitted on 2/21/2014: 

2. Two separate lab reports were provided for FGD influent mercury results associated with samples 

collected on 4/10/2012. The laboratory report provided in NRG Energy’s original submission 

includes a FGD influent mercury result of 0.0013 mg/L, which is not included in the analytical 

data table; and the laboratory report provided in the additional data submission on 5/16/14 

includes a mercury result of 650 ug/L, which is included in the analytical data table. The data 

table also includes a FGD influent mercury result of 0.66 mg/L for 4/10/2012. Please provide a 

laboratory report verifying this result. Additionally, please explain why 0.0013 mg/L is not 

included in the analytical data table. 

3. We identified several discrepancies between the dilution factor (DF) values reported in the 

analytical spreadsheet compared to the cited dilution factors in the lab reports for the mercury 

results (see Table 2). Please confirm which dilution factor is correct for these data samples.

Table 2. Dilution Factor Discrepancies between Analytical Spreadsheet and Lab Reports for 

Mercury

Date

NonDetect 

Indicator

Units Amount MDL RL DF (from 

Spreadsheet)

DF (from

Lab 

Report)

Sample Point

03-Jan-12 D mg/L 0.54 0.05 0.1 1 500 FGD Influent (SP-1)

10-Jan-12 D mg/L 0.49 0.05 0.1 1 500 FGD Influent (SP-1)

17-Jan-12 D mg/L 0.66 0.05 0.1 1 500 FGD Influent (SP-1)

24-Jan-12 D mg/L 0.15 0.05 0.1 1 500 FGD Influent (SP-1)

31-Jan-12 D mg/L 0.57 0.05 0.1 1 500 FGD Influent (SP-1)
2

Table 2. Dilution Factor Discrepancies between Analytical Spreadsheet and Lab Reports for 

Mercury

Date

NonDetect 

Indicator

Units Amount MDL RL DF (from 

Spreadsheet)

DF (from

Lab 

Report)

Sample Point

07-Feb-12 D mg/L 0.69 0.05 0.1 1 500 FGD Influent (SP-1)

14-Feb-12 D mg/L 0.17 0.05 0.1 1 500 FGD Influent (SP-1)

21-Feb-12 D mg/L 0.33 0.05 0.1 1 500 FGD Influent (SP-1)

28-Feb-12 D mg/L 0.66 0.05 0.1 1 500 FGD Influent (SP-1)

06-Mar-12 D mg/L 0.38 0.05 0.1 1 500 FGD Influent (SP-1)

13-Mar-12 D mg/L 0.6 0.05 0.1 1 500 FGD Influent (SP-1)

20-Mar-12 D mg/L 0.66 0.05 0.1 1 500 FGD Influent (SP-1)

27-Mar-12 D mg/L 0.49 0.05 0.1 1 500 FGD Influent (SP-1)

03-Apr-12 D mg/L 0.16 0.05 0.1 1 500 FGD Influent (SP-1)

10-Apr-12 D μg/L 650 50 100 1 500 FGD Influent (SP-1)

17-Apr-12 ND mg/L 0.05 0.1 1 500 FGD Influent (SP-1)

25-Apr-12 D mg/L 0.89 0.05 0.1 1 500 FGD Influent (SP-1)

01-May-12 D mg/L 0.95 0.05 0.1 1 500 FGD Influent (SP-1)

08-May-12 D mg/L 0.4 0.05 0.1 1 500 FGD Influent (SP-1)

15-May-12 D mg/L 0.25 0.05 0.1 1 500 FGD Influent (SP-1)

23-May-12 D mg/L 0.64 0.05 0.1 1 500 FGD Influent (SP-1)

29-May-12 D mg/L 0.82 0.05 0.1 1 500 FGD Influent (SP-1)

05-Jun-12 D mg/L 0.64 0.05 0.1 1 500 FGD Influent (SP-1)

12-Jun-12 D mg/L 0.73 0.05 0.1 1 500 FGD Influent (SP-1)

20-Jun-12 D mg/L 0.54 0.05 0.1 1 500 FGD Influent (SP-1)

26-Jun-12 D mg/L 0.14 0.05 0.1 1 500 FGD Influent (SP-1)

03-Jul-12 D mg/L 0.745 0.05 0.1 1 500 FGD Influent (SP-1)

10-Jul-12 D mg/L 0.89 0.05 0.1 1 500 FGD Influent (SP-1)

17-Jul-12 D mg/L 0.66 0.05 0.1 1 500 FGD Influent (SP-1)

24-Jul-12 D mg/L 0.835 0.05 0.1 1 500 FGD Influent (SP-1)

31-Jul-12 D mg/L 0.362 0.05 0.1 1 500 FGD Influent (SP-1)

07-Aug-12 D mg/L 0.114 0.05 0.1 1 500 FGD Influent (SP-1)

14-Aug-12 D mg/L 0.59 0.05 0.1 1 500 FGD Influent (SP-1)

21-Aug-12 D mg/L 0.264 0.05 0.1 1 500 FGD Influent (SP-1)

28-Aug-12 D mg/L 0.535 0.05 0.1 1 500 FGD Influent (SP-1)

28-Aug-12 ND mg/L 0.001 1 5 Outfall 101 (SP-2)

05-Sep-12 D mg/L 0.67 0.05 0.1 1 500 FGD Influent (SP-1)

11-Sep-12 D mg/L 0.465 0.05 0.1 1 500 FGD Influent (SP-1)

18-Sep-12 ND mg/L 0.05 0.1 1 500 FGD Influent (SP-1)

24-Oct-12 D mg/L 0.418 0.05 0.1 1 500 FGD Influent (SP-1)

30-Oct-12 D mg/L 0.79 0.05 0.1 1 500 FGD Influent (SP-1)
3

Table 2. Dilution Factor Discrepancies between Analytical Spreadsheet and Lab Reports for 

Mercury

Date

NonDetect 

Indicator

Units Amount MDL RL DF (from 

Spreadsheet)

DF (from

Lab 

Report)

Sample Point

07-Nov-12 D mg/L 0.77 0.05 0.1 1 500 FGD Influent (SP-1)

12-Nov-12 D mg/L 0.364 0.05 0.1 1 500 FGD Influent (SP-1)

19-Nov-12 D mg/L 0.481 0.05 0.1 1 500 FGD Influent (SP-1)

26-Nov-12 D mg/L 0.109 0.05 0.1 1 500 FGD Influent (SP-1)

03-Dec-12 D mg/L 0.308 0.05 0.1 1 500 FGD Influent (SP-1)

05-Dec-12 D mg/L 0.242 0.05 0.1 1 500 FGD Influent (SP-1)

12-Dec-12 D mg/L 0.333 0.05 0.1 1 500 FGD Influent (SP-1)

17-Dec-12 D mg/L 0.308 0.05 0.1 1 500 FGD Influent (SP-1)

26-Dec-12 D mg/L 0.585 0.05 0.1 1 500 FGD Influent (SP-1)

02-Jan-13 ND mg/L 0.05 0.1 1 500 FGD Influent (SP-1)

07-Jan-13 D mg/L 0.43 0.05 0.1 1 500 FGD Influent (SP-1)

14-Jan-13 D mg/L 0.615 0.05 0.1 1 500 FGD Influent (SP-1)

21-Jan-13 ND mg/L 0.05 0.1 1 500 FGD Influent (SP-1)

29-Jan-13 D mg/L 0.705 0.05 0.1 1 500 FGD Influent (SP-1)

05-Feb-13 D mg/L 0.54 0.05 0.1 1 500 FGD Influent (SP-1)

11-Feb-13 D mg/L 0.178 0.05 0.1 1 500 FGD Influent (SP-1)

18-Feb-13 D mg/L 0.191 0.05 0.1 1 500 FGD Influent (SP-1)

25-Feb-13 D mg/L 0.545 0.05 0.1 1 500 FGD Influent (SP-1)

04-Mar-13 D mg/L 0.375 0.05 0.1 1 500 FGD Influent (SP-1)

11-Mar-13 D mg/L 0.625 0.05 0.1 1 500 FGD Influent (SP-1)

19-Mar-13 D mg/L 0.63 0.05 0.1 1 500 FGD Influent (SP-1)

25-Mar-13 D mg/L 0.109 0.05 0.1 1 500 FGD Influent (SP-1)

01-Apr-13 D mg/L 0.52 0.05 0.1 1 500 FGD Influent (SP-1)

09-Apr-13 D mg/L 0.585 0.05 0.1 1 500 FGD Influent (SP-1)

15-Apr-13 D mg/L 0.26 0.05 0.1 1 500 FGD Influent (SP-1)

22-Apr-13 D mg/L 0.351 0.05 0.1 1 500 FGD Influent (SP-1)

29-Apr-13 D mg/L 0.408 0.05 0.1 1 500 FGD Influent (SP-1)

06-May-13 D mg/L 0.153 0.05 0.1 1 500 FGD Influent (SP-1)

13-May-13 D mg/L 0.835 0.05 0.1 1 500 FGD Influent (SP-1)

20-May-13 D mg/L 0.9 0.05 0.1 1 500 FGD Influent (SP-1)

28-May-13 D mg/L 0.203 0.05 0.1 1 500 FGD Influent (SP-1)

03-Jun-13 D mg/L 0.75 0.05 0.1 1 500 FGD Influent (SP-1)

10-Jun-13 D mg/L 0.278 0.05 0.1 1 500 FGD Influent (SP-1)

22-Jun-13 D mg/L 0.78 0.05 0.1 1 500 FGD Influent (SP-1)

26-Jun-13 D mg/L 0.178 0.05 0.1 1 500 FGD Influent (SP-1)

01-Jul-13 D mg/L 0.925 0.05 0.1 1 500 FGD Influent (SP-1)
4

Table 2. Dilution Factor Discrepancies between Analytical Spreadsheet and Lab Reports for 

Mercury

Date

NonDetect 

Indicator

Units Amount MDL RL DF (from 

Spreadsheet)

DF (from

Lab 

Report)

Sample Point

08-Jul-13 D mg/L 0.77 0.05 0.1 1 500 FGD Influent (SP-1)

15-Jul-13 D mg/L 0.79 0.05 0.1 1 500 FGD Influent (SP-1)

22-Jul-13 D mg/L 0.31 0.05 0.1 1 500 FGD Influent (SP-1)

29-Jul-13 D mg/L 0.85 0.05 0.1 1 500 FGD Influent (SP-1)

05-Aug-13 ND mg/L 0.05 0.1 1 500 FGD Influent (SP-1)

12-Aug-13 D mg/L 0.625 0.05 0.1 1 500 FGD Influent (SP-1)

19-Aug-13 D mg/L 0.153 0.05 0.1 1 500 FGD Influent (SP-1)

26-Aug-13 D mg/L 0.93 0.05 0.1 1 500 FGD Influent (SP-1)

03-Sep-13 D mg/L 0.945 0.05 0.1 1 500 FGD Influent (SP-1)

09-Sep-13 D mg/L 0.431 0.05 0.1 1 500 FGD Influent (SP-1)

16-Sep-13 D mg/L 0.432 0.05 0.1 1 500 FGD Influent (SP-1)

23-Sep-13 D mg/L 0.56 0.05 0.1 1 500 FGD Influent (SP-1)

30-Sep-13 D mg/L 0.214 0.05 0.1 1 500 FGD Influent (SP-1)

07-Oct-13 D mg/L 0.436 0.05 0.1 1 500 FGD Influent (SP-1)

14-Oct-13 D mg/L 0.327 0.05 0.1 1 500 FGD Influent (SP-1)

21-Oct-13 D mg/L 0.334 0.05 0.1 1 500 FGD Influent (SP-1)

28-Oct-13 D mg/L 0.117 0.05 0.1 1 500 FGD Influent (SP-1)

04-Nov-13 D mg/L 0.106 0.05 0.1 1 500 FGD Influent (SP-1)

11-Nov-13 D mg/L 0.414 0.05 0.1 1 500 FGD Influent (SP-1)

18-Nov-13 D mg/L 0.52 0.05 0.1 1 500 FGD Influent (SP-1)

25-Nov-13 D mg/L 0.59 0.05 0.1 1 500 FGD Influent (SP-1)

02-Dec-13 D mg/L 0.65 0.05 0.1 1 500 FGD Influent (SP-1)

09-Dec-13 D mg/L 0.288 0.05 0.1 1 500 FGD Influent (SP-1)

16-Dec-13 D mg/L 0.735 0.05 0.1 1 500 FGD Influent (SP-1)

23-Dec-13 D mg/L 0.126 0.05 0.1 1 500 FGD Influent (SP-1)