### UNITED STATES ENVIRONMENTAL PROTECTION AGENCY WASHINGTON, D.C. 20460

OFFICE OF WATER 

### MEMORANDUM

DATE: September 7, 2010

SUBJECT: 

### Correction to the data presented in the DCN AD01208 and DCN AD01222 for the Airport Deicing Proposed Effl uent Limitation Guidelines.

FROM: 

### Cuc Schroeder, EPA Statistician Engineering and Analysis Division Office of Science and Technology

TO: 

### Eric Strassler, Project Manager, Airport De icing Effluent Guidelines Brian D’Amico, Environmental Engineer Engineering and Analysis Division Office of Science and Technology
The purpose of this memorandum is to provide the correction to the da ta listed in DCN AD01222 and DCN AD01208 (Airport Deicing Proposed Efflue nt Limitation Guidelines). Both DCN AD01222 and DCN AD01208 should contain the data that were used as the basis to calculate the daily and weekly limits for COD. The reason for the correction is that the wrong data sets were mistakenly put in these two DCNs, even though the correct data were available. The correct data provided in this memorandum will not change th e proposed daily or weekly COD limits.

DCN AD01222 is in Excel format and contains data used to pr oduce both the daily and weekly COD limits. The daily and week ly average listing of COD in AD 01222 are incorrect and need to be replaced with the data sent with th is memorandum (i.e., an Excel file named “AD01222_Correction”containing the corr ect data will be sent to the engineers together with this memorandum). Details of the corrections for the daily and weekly data are given below.

 The daily COD data in AD01222 are incorrect because the Season06 data are missing. Season06 was part of the data used in calcula ting the daily COD limit. The corrected data includes all the data that were in DCN AD01222 w ith the addition of the Season06 data. These daily COD values can be used to reproduce the proposed daily limit for COD (271 mg/L).

 The weekly average COD data in AD01222 are in correct because some of the values are slightly different than they should be. Th e wrong data set was mistakenly put in the record even though the correct one was available. The corrected weekly data set is still derived from the daily data set, and the met hod used to calculate the weekly averages is still as described in the technical document for the proposed Effluent Limitation Guidelines. These weekly COD average valu es can be used to reproduce the proposed weekly limit for COD (154 mg/L).

### Page 2 of 9 DCN AD01208 is in Word format and contains data used to pr oduce both the daily and weekly COD limits (data in AD01208 are id entical to the data listed in AD01222). The daily COD data presented in Attachment 3 of AD01208 are correct. However, the weekly COD average values in Attachment 5 of AD01208 are incorrect and n eed to be replaced with the data given in Attachment 1 of this memorandum. Furthermor e, the data presented in Attachment 6 of AD01208 are incorrect and need to be replaced with the data given in Attachment 2 of this memo. Details of the corrections for the weekly data are given below.

 The weekly average COD listing in Attachment 3 of AD01208 is incorrect because some of the values are slightly different than they should be. The wrong data set was mistakenly put in the record even though the correct one wa s available. The correct listing of the weekly COD averages is given in Attachment 1 of this memorandum. The corrected weekly data set is still derived fr om the Albany daily data set, and the method used to calculate the weekly averages is st ill as described in the technical document for the proposed Effluent Limitation Guidelines. These weekly COD av erage values can be used to reproduce the proposed weekly limit for COD (154 mg/L).

 The listing of the weekly average greater than the proposed weekly average limitation (see Attachment 6 of AD01208) is incorrect because some of the values are slightly different than they should be. The wrong lis ting was mistakenly included previously in AD01208. The correct listing is given in Attachment 2 of this memo.

### Page 3 of 9 Attachment 1 : Weekly average COD values used as the basis for the COD limitation proposed in Airport Deicing Effluent Limitation Guidelines.

Starting Week (MM/DD/YYY) ArprtR-101 ArprtR-102 

### Number of daily values in weekly average Weekly Average (mg/L) Number of daily values in weekly average Weekly Average (mg/L) 12/1/1999 1 20.0 1 20.0 12/13/1999 5 41.6 5 39.2 12/20/1999 4 11.5 4 2.3 12/27/1999 4 3.0 4 15.8

1/3/2000 1 2.0 0 1/17/2000 5 20.0 5 20.8 1/24/2000 5 8.6 5 21.2 1/31/2000 5 28.8 2 19.5 2/7/2000 2 22.5 0 3/13/2000 5 133.0 5 23.0 3/20/2000 4 187.5 4 37.8 3/27/2000 5 21.2 5 21.6 4/3/2000 4 22.5 5 7.4 4/10/2000 5 12.4 5 9.6 4/17/2000 5 14.8 5 11.2 4/24/2000 5 23.0 5 15.8 5/1/2000 5 17.0 5 11.6 5/8/2000 5 28.4 5 11.6 5/15/2000 5 15.2 5 21.4 5/22/2000 5 14.4 5 9.6 5/29/2000 5 16.8 5 14.8 6/5/2000 5 21.8 5 6.0 6/12/2000 5 12.0 5 9.8 6/19/2000 5 10.4 5 8.2 6/26/2000 4 24.0 4 20.0 2/19/2001 1 140.0 1 168.0 2/26/2001 5 133.0 5 122.8 3/5/2001 4 77.8 5 88.6 3/12/2001 5 162.4 5 64.0 3/19/2001 3 102.0 4 165.8 3/26/2001 5 112.0 5 58.8 4/2/2001 5 98.8 5 61.0 4/9/2001 5 84.8 5 66.8 4/16/2001 5 70.0 5 68.6 4/23/2001 5 69.2 5 62.4 4/30/2001 5 65.6 5 84.8 5/7/2001 5 67.2 5 56.0 5/14/2001 5 49.4 5 40.4 5/21/2001 5 38.8 5 34.4 5/28/2001 3 23.7 5 18.4 6/4/2001 4 26.8 4 21.3 6/11/2001 4 29.3 4 37.0

### Page 4 of 9 6/18/2001 4 27.3 4 23.3 6/25/2001 5 32.8 5 31.0 12/17/2001 5 37.6 5 41.4 12/24/2001 5 29.8 5 30.4 12/31/2001 5 36.2 5 45.4

1/7/2002 4 36.8 4 31.5 1/14/2002 5 33.2 3 31.3 1/21/2002 5 28.0 5 28.4 1/28/2002 4 19.8 4 20.3 2/4/2002 3 43.7 3 31.3 2/11/2002 5 46.4 5 49.6 2/18/2002 5 53.2 5 53.2 2/25/2002 5 63.4 5 62.2 3/4/2002 5 69.4 5 74.6 3/11/2002 5 82.8 5 63.4 3/18/2002 5 65.8 5 60.0 3/25/2002 5 64.6 5 57.0 4/1/2002 5 65.2 5 51.2 4/8/2002 5 47.6 5 31.8 4/15/2002 5 30.0 5 28.6 4/22/2002 5 32.8 5 31.2 4/29/2002 5 31.4 5 22.0 5/6/2002 5 29.6 5 23.0 5/13/2002 5 32.2 5 24.2 5/20/2002 5 27.0 5 22.8 5/27/2002 5 28.2 5 23.0 6/3/2002 5 25.6 5 22.8 6/10/2002 2 49.5 2 69.5 11/25/2002 5 27.6 5 35.0 12/2/2002 5 50.6 5 45.8 12/9/2002 5 44.0 5 36.6 12/16/2002 5 49.2 5 41.2 12/23/2002 4 46.3 4 35.0 12/30/2002 5 46.2 5 40.4

1/6/2003 5 40.8 5 33.6 1/13/2003 5 66.6 5 55.4 1/20/2003 5 57.8 5 48.8 1/27/2003 4 55.5 4 53.3 2/3/2003 4 77.8 4 54.0 2/10/2003 5 68.8 5 51.4 2/17/2003 5 72.2 5 53.0 2/24/2003 5 93.6 5 67.4 3/3/2003 5 101.6 5 48.4 3/10/2003 5 125.4 5 57.8 3/17/2003 5 86.0 5 56.8 3/24/2003 5 84.6 5 54.4 3/31/2003 5 68.2 5 42.0 4/7/2003 4 94.0 4 46.8 4/14/2003 4 104.0 5 74.6 4/21/2003 5 133.2 5 73.8

### Page 5 of 9 4/28/2003 5 133.6 5 68.4 5/5/2003 5 140.4 5 67.8 5/12/2003 5 142.8 5 67.8 5/19/2003 5 337.0 5 87.4 5/26/2003 5 89.0 5 60.0 6/2/2003 5 60.4 5 40.6 12/1/2003 0 1 1.0 12/8/2003 5 21.8 5 44.0 12/15/2003 5 49.8 5 16.2 12/22/2003 5 19.8 5 53.6 12/29/2003 5 22.8 5 32.2

1/5/2004 5 190.8 5 36.4 1/12/2004 5 36.4 5 38.6 1/19/2004 5 94.4 5 64.6 1/26/2004 4 52.3 4 60.0 2/2/2004 5 72.4 5 63.0 2/9/2004 5 120.6 5 71.0 2/16/2004 5 35.4 5 66.0 2/23/2004 5 48.2 5 76.8 3/1/2004 5 101.8 5 80.0 3/8/2004 5 76.0 5 116.0 3/15/2004 5 257.4 5 112.4 3/22/2004 5 78.4 5 77.4 3/29/2004 5 73.8 5 77.4 4/5/2004 5 62.0 5 73.8 4/12/2004 5 47.2 5 78.8 4/19/2004 5 60.0 5 62.6 4/26/2004 5 35.8 5 60.2 5/3/2004 4 39.3 4 75.5 12/13/2004 2 10.5 4 5.0 12/20/2004 2 7.5 2 22.0 12/27/2004 5 10.0 5 24.6

1/3/2005 5 63.0 5 179.2 1/10/2005 5 13.2 5 66.8 1/17/2005 5 20.4 5 49.6 1/24/2005 5 19.6 5 91.2 1/31/2005 5 28.4 5 155.8 2/7/2005 5 28.2 5 133.6 2/14/2005 5 34.8 5 168.2 2/21/2005 5 40.6 5 149.2 2/28/2005 5 32.4 5 101.6 3/7/2005 3 29.3 4 89.3 3/14/2005 3 60.3 3 100.0 3/21/2005 3 54.3 5 89.4 3/28/2005 5 39.8 5 92.0 4/4/2005 5 33.0 5 74.0 4/11/2005 4 23.3 4 66.3 4/18/2005 5 28.8 5 73.0 4/25/2005 5 19.2 5 63.2 5/2/2005 5 31.0 5 83.4

### Page 6 of 9 5/9/2005 4 17.5 4 79.0 5/16/2005 2 12.0 2 74.0 11/28/2005 2 34.5 3 53.3 12/5/2005 5 67.2 5 122.2 12/12/2005 3 29.7 5 65.0 12/19/2005 4 27.0 5 89.4

1/2/2006 2 29.0 2 145.5 1/9/2006 1 30.0 1 91.0 2/6/2006 5 41.4 4 97.0 2/13/2006 5 41.0 5 99.6 2/20/2006 5 27.8 5 79.2 2/27/2006 4 35.5 5 86.8 3/6/2006 4 32.3 5 81.8 3/13/2006 5 28.0 5 69.6 3/20/2006 3 31.0 3 64.0 3/27/2006 5 20.4 3 66.3 4/3/2006 5 24.0 5 62.8 4/10/2006 4 10.3 4 50.8 4/17/2006 3 48.0 3 42.3 1/1/2007 5 19.8 3 60.0 1/8/2007 4 2.8 4 16.5 4/2/2007 3 29.0 3 61.0 4/9/2007 1 26.0 1 86.0 4/16/2007 5 41.4 5 117.6 4/23/2007 5 21.4 5 106.0 4/30/2007 5 25.4 5 84.4 5/7/2007 5 9.2 5 38.8 5/14/2007 5 6.4 5 25.4 5/21/2007 5 6.8 5 32.6 5/28/2007 1 136.0 1 90.0 12/31/2007 2 111.0 0

1/7/2008 5 312.2 0 1/14/2008 5 46.4 0 1/21/2008 5 44.0 0 1/28/2008 5 41.0 0 3/3/2008 4 50.3 4 49.8 3/10/2008 5 54.4 5 43.2 3/17/2008 5 56.4 5 41.6 3/24/2008 5 46.8 5 36.8 3/31/2008 5 41.6 5 32.8 4/7/2008 5 47.2 5 40.6 4/14/2008 5 37.6 5 31.2 4/21/2008 5 47.4 5 34.0 4/28/2008 5 27.4 5 27.4 5/5/2008 5 26.6 5 28.8 5/12/2008 3 40.7 5 37.8 5/19/2008 5 20.6 5 18.6 5/26/2008 5 19.6 5 17.0 6/2/2008 3 38.7 5 36.4 6/9/2008 1 38.0 1 22.0

### Page 7 of 9 12/8/2008 1 32.0 1 42.0 12/15/2008 5 33.4 5 31.2 12/22/2008 5 176.8 5 84.4 12/29/2008 5 34.2 5 26.6

1/5/2009 5 30.6 5 28.4 1/12/2009 5 30.0 5 31.6 1/19/2009 5 28.8 5 34.2 1/26/2009 5 47.8 5 34.2 2/2/2009 5 29.0 5 26.8 2/9/2009 5 30.6 5 32.0 2/16/2009 5 39.8 5 44.4 2/23/2009 5 47.6 5 50.6 3/2/2009 5 49.0 5 42.0 3/9/2009 5 39.8 5 47.6 3/16/2009 5 41.8 5 44.0 3/23/2009 5 28.6 5 34.6 3/30/2009 5 29.2 5 40.8 4/6/2009 5 34.6 5 34.8

### Page 8 of 9 Attachment 2 : Weekly averages greater than th e proposed weekly average limitation.

Date Unit ArprtR-101 Unit ArprtR-102 Concentration (mg/L) Is Average Greater Than

Proposed Limitation? Concentration (mg/L) Is Average Greater Than

Proposed Limitation? Starting Week (MM/DD/YYY) Day within a Week Daily Value * Weekly Average Daily Value * Weekly Average

3/20/2000 20MAR2000 126 187.5 Yes 2 37.75 No
21MAR2000 212 30
22MAR2000 97 26
23MAR2000 315 93
2/19/2001 23FEB2001 140 140.0 No 168 168.00 Yes
3/12/2001 12MAR2001 575 162.4 Yes 92 64.00 No
13MAR2001 91 52
14MAR2001 63 75
15MAR2001 36 40
16MAR2001 47 61
3/19/2001 19MAR2001 104 102.0 No 105 165.75 Yes
21MAR2001

. 105
22MAR2001 129 393
23MAR2001 73 60
5/19/2003 19MAY2003 460 337.0 Yes 95 87.40 No
20MAY2003 655 86
21MAY2003 178 83
22MAY2003 290 101
23MAY2003 102 72
1/5/2004 05JAN2004 33 190.8 Yes 35 36.40 No
06JAN2004 267 40
07JAN2004 42 38
08JAN2004 387 37
09JAN2004 225 32
3/15/2004 15MAR2004 69 257.4 Yes 100 112.40 No
16MAR2004 316 124
17MAR2004 699 118
18MAR2004 123 126
19MAR2004 80 94
1/3/2005 03JAN2005 2 63.0 No 18 179.20 Yes

### Page 9 of 9 Date Unit ArprtR-101 Unit ArprtR-102 Concentration (mg/L) Is Average Greater Than

Proposed Limitation? Concentration (mg/L) Is Average Greater Than

Proposed Limitation? Starting Week (MM/DD/YYY) Day within a Week Daily Value * Weekly Average Daily Value * Weekly Average

04JAN2005 275 725
05JAN2005 2 30
06JAN2005 24 70
07JAN2005 12 53
1/31/2005 31JAN2005 20 28.4 No 72 155.8 Yes
01FEB2005 24 72
02FEB2005 25 79
03FEB2005 35 196
04FEB2005 38 360
2/14/2005 14FEB2005 40 34.8 No 94 168.20 Yes
15FEB2005 33 118
16FEB2005 38 238
17FEB2005 30 175
18FEB2005 33 216
1/7/2008 07JAN2008 28 312.2 Yes No values for this week 08JAN2008 18
09JAN2008 1042
10JAN2008 433
11JAN2008 40
12/22/2008 22DEC2008 32 176.8 Yes 35 84.40 No
23DEC2008 35 29
24DEC2008 27 30
25DEC2008 674 282
26DEC2008 116 46 * Daily Values in bold text are greater than the proposed daily maximum limitation.