DATA SUBSTITUTION ANALYSIS

2009 OZONE

BRANDYWINE (AQS SITE ID 10-003-1010)

DELAWARE DNREC

DIVISION OF AIR QUALITY

JULY 15, 2010
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Summary

In April 2009, several weather-related problems caused extensive down-time at the Brandywine 

air monitoring station (AQS ID 10-003-1010). An extended power outage combined with 

downed telephone lines resulted in no valid data being collected from the beginning of the ozone 

season on April 1, 2009 through May 15, 2009. Mechanical problems with the monitor resulted 

in additional data losses in late August, early September, and most of October 2009. The total 

valid data capture for 2009 at Brandywine was 53%.

Section 2.3(b) of Appendix I to 40 CFR Part 50 requires three consecutive years of data with 

data availability of at least 90% on average, with a minimum data completeness in any one year 

of at least 75%. Furthermore, this section also states:

“... When computing whether the minimum data completeness requirements have been 

met, meteorological or ambient data may be sufficient to demonstrate that meteorological 

conditions on missing days were not conducive to concentrations above the level of the 

standard. Missing days assumed less than the level of the standard are counted for the 

purpose of meeting the data completeness requirement, subject to the approval of the 

appropriate Regional Administrator.”

The Delaware DNREC Division of Air Quality (DAQ) has analyzed the meteorological and 

ambient monitoring data for the 2009 ozone season and determined that the use of the null data 

code, “BG”, for the following 57 days is appropriate:

Dates Day Count

4/1/09 – 4/17/09 17

4/19/09 – 4/24/09 6

4/29/09 – 5/7/09 9

5/10/09 – 5/13/09 4

6/11/09 1

9/10/09 1

10/2/09 – 10/8/09 7

10/10/09 – 10/20/09 11

10/22/09 1

TOTAL 57

Adding the 57 days to the Brandywine data results in a data capture percentage of 79% for 2009, which 

meets the requirements of 40 CFR Part 50 Appendix I Section 2.3(b).
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Methodology

Delaware DAQ used a conservative approach to determine what missing days should be counted 

as valid days in regards to data completeness. Because ozone levels are largely dependent on 

maximum daily temperature, meteorological data from the Wilmington area can be used in 

combination with ozone data (both historical data from the Brandywine site and 2009 data from 

other nearby ozone sites) to evaluate the missing days of data to determine which days could be 

assumed to be below the NAAQS 8-hour standard of 0.075 ppm.

Historical data: Ozone data and daily high temperature data from 1997 – 2008 were compiled 

for the Brandywine monitoring site to create a profile of maximum daily 8-hr ozone values at 

various temperatures throughout the ozone season (Figure 1 in Appendix B). Ozone data prior to 

the administration of the NOx SIP Call was used as part of the conservative approach.

Daily maximum temperature data was retrieved from the National Weather Service site at New 

Castle County Airport south of Wilmington (see Appendix C). Analysis of the historical data 

shows that all exceedances of the 8-hour NAAQS of 0.075 ppm occurred on days with maximum 

daily temperatures at or above 77 °F. To maintain a conservative approach, a maximum daily 

temperature of 75 °F was chosen as the cut-off level for assuming the maximum 8-hour ozone 

level would have been below the NAAQS.

Other ozone sites: In addition to the meteorological data, ambient monitoring data from 

monitors in neighboring counties provide additional evidence that levels on the missing days

were well below the 8-hr ozone NAAQS at Brandywine. Table 1 in Appendix B shows the 

maximum daily 8-hr ozone data from the 2009 ozone season for the Brandywine monitor and 

monitors from neighboring counties in Delaware, Maryland, Pennsylvania, and New Jersey 

(Figure 2 in Appendix B). 
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Results 

Table 1 in Appendix B identifies the days assumed to be less than the standard at Brandywine as 

follows. Cells highlighted in yellow represent the maximum daily 8-hr ozone value at the sites 

used in the analysis. Cells highlighted in orange represented days when the Brandywine monitor 

was down. Cells highlighted in orange with an “x” represent days that DAQ deems appropriate 

for use in the data completeness calculation. These days are summarized below:

Dates Day Count

4/1/09 – 4/17/09 17

4/19/09 – 4/24/09 6

4/29/09 – 5/7/09 9

5/10/09 – 5/13/09 4

6/11/09 1

9/10/09 1

10/2/09 – 10/8/09 7

10/10/09 – 10/20/09 11

10/22/09 1

TOTAL 57

A total of 57 days were identified as meeting the requirement to be assumed as below the 8-hour 

NAAQS. The maximum daily 8-hr ozone value at neighboring sites for the missing days was 

0.065 ppm, well below the NAAQS. The addition of the 57 days to the data for Brandywine 

results in a data capture percentage of 79% for 2009.
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APPENDIX A - Procedure

Procedure

(1) Download ambient monitoring data from AQS (maximum daily 8-hr ozone values, AMP 435 

Report).

a. The daily maximum 8-hr values are identified in column “Daily Max Sample Value” 

when the “Duration” column equals “8-HR RUN AVG BEGIN HOUR”.

b. Data from the following sites were downloaded:

AQS SITE ID COUNTY, STATE SITE NAME PERIOD

10-003-1010 New Castle County, DE Brandywine 1997 – 2009

10-003-1013 New Castle County, DE Bellefonte2 4/1/09 – 10/31/09

10-003-1007 New Castle County, DE Lums Pond 4/1/09 – 10/31/09

10-001-0002 Kent County, DE Killens Pond 4/1/09 – 10/31/09

42-029-0100 Chester County, PA New Garden Airport 4/1/09 – 10/31/09

42-045-0002 Delaware County, PA Chester 4/1/09 – 10/31/09

34-007-1001 Camden, NJ Camden 4/1/09 – 10/31/09

34-015-0002 Gloucester County, NJ Clarksboro 4/1/09 – 10/31/09

24-015-0003 Cecil County, MD Fair Hill 4/1/09 – 10/31/09

(2) Download daily weather data from the National Weather Service at New Castle County

airport (ILG).

a. 1997 – 2004 data: http://www.erh.noaa.gov/phi/localclimate.html#Archives

b. 2005 – 2009 data: http://www.weather.gov/climate/index.php?wfo=phi

(3) During the ozone season (April 1 – October 31), create a profile of maximum daily 8-hr 

ozone values versus temperature

a. Merge data from steps (1) and (2), to create a table of maximum daily 8-hr ozone 

value and count for each temperature.

b. See Figure 1. Maximum Daily 8-hr Ozone Concentration versus Temperature

(4) Analyze 2009 Ozone data

a. Create a table of ambient monitoring and weather data for 2009.

b. Based on Figure 1, determine the maximum temperature (and maximum 8-hr value) 

that falls below the 8-hr ozone NAAQS of 0.075 ppm.

c. Based on (4)(b), identify days that should be counted towards data completeness.

(5) All data is provided on CD as an attachment.
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APPENDIX B – Figures and Tables

Figure 1. Maximum Daily 8-hr Ozone Concentration versus Temperature

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14 38394142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899 100 Max Daily 8-hr O3 Conc (ppm)

Max Daily Temp (f)

Max Daily 8-hr Ozone Concentration Brandywine vs Temperature

1997 - 2008

Max O3 conc 8-hr NAAQS

Max temp and max 8-hr ozone below 8-hr 

NAAQS value 0.075 ppm
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Figure 2. Ozone Monitors in counties adjoining Brandywine site (10-003-1010) in New Castle County, DE
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Table 1. 2009 Daily Maximum 8-hr Ozone Data

Monitor down at Brandywine

x Assumed below NAAQS based on meteorology and monitoring data from other sites

Maximum 8-hour daily ozone level from regional monitors

Date

Brandywine (New Castle) 

10-003-1010

Bellefonte2 (New Castle) 

10-003-1013

Lums Pond (New Castle) 

10-003-1007

Killens Pond (Kent) 

10-001-0002

Fair Hill (Cecil, MD) 

24-015-0003

New Garden Airport (Chester, PA) 

42-045-0002

Chester (Delaware, PA) 

42-045-0002

Camden (Camden, NJ) 

34-007-1001

Clarksboro (Gloucester, NJ) 

34-015-0002

Max Temp °F

4/1/2009 x 0.027 0.040 0.040 0.037 0.042 0.034 52

4/2/2009 x 0.030 0.040 0.040 0.033 0.042 0.036 63

4/3/2009 x 0.046 0.051 0.049 0.047 0.044 0.052 0.048 72

4/4/2009 x 0.050 0.053 0.053 0.051 0.049 0.055 0.051 62

4/5/2009 x 0.053 0.054 0.059 0.055 0.052 0.061 0.054 67

4/6/2009 x 0.039 0.048 0.048 0.042 0.051 0.041 60

4/7/2009 x 0.043 0.045 0.046 0.045 0.045 0.047 49

4/8/2009 x 0.046 0.050 0.052 0.048 0.051 0.046 54

4/9/2009 x 0.055 0.056 0.060 0.054 0.063 0.057 63

4/10/2009 x 0.056 0.059 0.059 0.062 0.058 0.059 0.065 0.063 67

4/11/2009 x 0.042 0.043 0.046 0.047 0.043 0.043 0.052 0.041 53

4/12/2009 x 0.047 0.050 0.050 0.052 0.048 0.049 0.055 0.049 53

4/13/2009 x 0.046 0.046 0.049 0.048 0.046 0.046 0.054 0.047 56

4/14/2009 x 0.034 0.047 0.050 0.046 0.042 0.038 0.056 0.048 49

4/15/2009 x 0.032 0.044 0.048 0.045 0.036 0.034 0.055 0.047 48

4/16/2009 x 0.045 0.050 0.050 0.052 0.049 0.048 0.056 0.047 64

4/17/2009 x 0.055 0.058 0.059 0.060 0.056 0.055 0.064 0.058 69

4/18/2009 0.064 0.066 0.066 0.064 0.063 0.075 0.068 77

4/19/2009 x 0.050 0.056 0.052 0.056 0.051 0.054 0.052 67

4/20/2009 x 0.039 0.044 0.047 0.040 0.043 0.047 0.043 52

4/21/2009 x 0.045 0.049 0.045 0.054 0.049 0.045 0.048 0.047 68

4/22/2009 x 0.034 0.036 0.040 0.037 0.033 0.038 0.034 53

4/23/2009 x 0.042 0.046 0.048 0.047 0.044 0.042 0.050 0.044 60
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4/24/2009 x 0.053 0.060 0.060 0.064 0.059 0.056 0.068 0.060 72

4/25/2009 0.065 0.063 0.061 0.076 0.067 0.058 0.073 0.067 88

4/26/2009 0.069 0.063 0.064 0.070 0.065 0.058 0.074 0.063 91

4/27/2009 0.067 0.064 0.061 0.072 0.068 0.061 0.067 0.064 89

4/28/2009 0.061 0.059 0.053 0.067 0.065 0.057 0.062 0.064 86

4/29/2009 x 0.032 0.034 0.040 0.032 0.028 0.040 0.044 0.034 68

4/30/2009 x 0.040 0.049 0.047 0.050 0.049 0.044 0.054 0.048 64

5/1/2009 x 0.025 0.033 0.036 0.034 0.028 0.026 0.037 73

5/2/2009 x 0.031 0.034 0.033 0.035 0.040 0.035 0.035 0.035 65

5/3/2009 x 0.031 0.041 0.043 0.036 0.034 0.041 0.043 0.039 58

5/4/2009 x 0.033 0.039 0.046 0.042 0.040 0.026 0.049 0.056 55

5/5/2009 x 0.031 0.042 0.042 0.039 0.036 0.027 0.048 0.030 60

5/6/2009 x 0.034 0.038 0.038 0.038 0.036 0.040 0.039 65

5/7/2009 x 0.026 0.033 0.032 0.031 0.038 0.026 0.033 0.032 73

5/8/2009 0.054 0.057 0.054 0.059 0.055 0.056 0.063 0.059 76

5/9/2009 0.054 0.053 0.046 0.057 0.052 0.051 0.054 0.056 83

5/10/2009 x 0.047 0.047 0.049 0.048 0.044 0.045 0.049 0.046 72

5/11/2009 x 0.031 0.036 0.036 0.032 0.030 0.029 0.037 0.032 63

5/12/2009 x 0.052 0.053 0.049 0.055 0.051 0.049 0.050 0.049 69

5/13/2009 x 0.059 0.063 0.061 0.065 0.063 0.061 0.063 71

5/14/2009 0.044 0.045 0.048 0.044 0.044 0.049 0.046 75

5/15/2009 0.035 0.055 0.053 0.043 0.029 0.045 79

5/16/2009 0.038 0.033 0.032 0.032 0.030 0.031 0.032 78

5/17/2009 0.053 0.032 0.041 0.037 0.039 0.046 0.043 68

5/18/2009 0.049 0.047 0.049 0.045 0.043 0.047 0.046 62

5/19/2009 0.054 0.051 0.054 0.061 0.055 0.050 0.054 0.053 68

5/20/2009 0.063 0.064 0.068 0.065 0.063 0.068 0.062 78

5/21/2009 0.055 0.050 0.062 0.060 0.056 0.062 0.059 79

5/22/2009 0.065 0.059 0.053 0.068 0.065 0.056 0.060 0.061 82

5/23/2009 0.050 0.045 0.040 0.052 0.049 0.046 0.049 0.050 85

5/24/2009 0.047 0.045 0.030 0.045 0.042 0.039 0.037 0.043 82

5/25/2009 0.058 0.062 0.033 0.058 0.056 0.063 0.057 0.066 84

5/26/2009 0.036 0.036 0.031 0.039 0.039 0.036 0.037 0.042 70

5/27/2009 0.025 0.025 0.028 0.029 0.025 0.026 0.026 0.027 0.031 75

5/28/2009 0.024 0.021 0.026 0.024 0.029 0.028 0.021 0.023 0.023 79

5/29/2009 0.032 0.031 0.040 0.037 0.037 0.034 0.030 0.037 0.030 77

5/30/2009 0.057 0.057 0.055 0.059 0.056 0.054 0.055 0.060 0.060 79

5/31/2009 0.058 0.057 0.060 0.060 0.056 0.055 0.057 0.060 0.062 81

6/1/2009 0.046 0.043 0.048 0.049 0.050 0.047 0.046 0.049 0.048 71

6/2/2009 0.055 0.056 0.068 0.069 0.054 0.065 0.057 86

6/3/2009 0.038 0.039 0.052 0.061 0.041 0.042 0.046 0.048 78
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6/4/2009 0.030 0.030 0.037 0.045 0.030 0.029 0.034 0.039 0.030 63

6/5/2009 0.034 0.027 0.038 0.046 0.034 0.033 0.023 0.046 0.037 62

6/6/2009 0.041 0.042 0.042 0.038 0.045 0.042 0.044 0.052 0.049 76

6/7/2009 0.057 0.053 0.054 0.051 0.060 0.057 0.056 0.055 0.058 81

6/8/2009 0.056 0.055 0.047 0.046 0.053 0.054 0.054 0.049 0.054 84

6/9/2009 0.036 0.040 0.047 0.045 0.035 0.035 0.037 0.040 81

6/10/2009 0.051 0.064 0.056 0.066 0.043 0.037 0.045 82

6/11/2009 x 0.019 0.041 0.035 0.028 0.023 0.022 0.019 73

6/12/2009 0.047 0.048 0.047 0.047 0.046 0.044 0.046 0.050 0.049 85

6/13/2009 0.037 0.035 0.050 0.049 0.049 0.043 0.036 0.042 0.037 81

6/14/2009 0.043 0.043 0.045 0.047 0.044 0.041 0.041 0.044 0.047 80

6/15/2009 0.048 0.046 0.044 0.037 0.048 0.049 0.046 0.044 0.052 76

6/16/2009 0.031 0.030 0.034 0.034 0.030 0.031 0.034 0.033 0.031 70

6/17/2009 0.026 0.023 0.029 0.028 0.025 0.025 0.027 0.026 0.025 69

6/18/2009 0.031 0.030 0.034 0.035 0.031 0.029 0.035 0.039 0.036 72

6/19/2009 0.042 0.043 0.044 0.044 0.042 0.041 0.039 0.047 0.042 79

6/20/2009 0.037 0.037 0.040 0.039 0.037 0.035 0.034 0.040 0.037 78

6/21/2009 0.032 0.034 0.032 0.034 0.032 0.031 0.032 0.032 0.033 79

6/22/2009 0.037 0.034 0.039 0.037 0.038 0.037 0.030 0.026 84

6/23/2009 0.043 0.046 0.040 0.044 0.043 0.041 0.049 0.043 83

6/24/2009 0.043 0.043 0.047 0.045 0.048 0.046 0.042 0.042 0.041 83

6/25/2009 0.063 0.059 0.064 0.045 0.068 0.063 0.064 0.060 0.072 84

6/26/2009 0.075 0.076 0.078 0.059 0.083 0.078 0.072 0.064 0.076 88

6/27/2009 0.041 0.041 0.044 0.051 0.043 0.039 0.040 0.053 0.046 83

6/28/2009 0.044 0.046 0.045 0.047 0.046 0.044 0.043 0.052 0.048 85

6/29/2009 0.055 0.057 0.054 0.060 0.053 0.053 0.053 0.061 0.060 84

6/30/2009 0.052 0.054 0.055 0.057 0.056 0.052 0.057 0.057 86

7/1/2009 0.057 0.052 0.058 0.056 0.054 0.057 0.060 0.066 85

7/2/2009 0.050 0.050 0.055 0.047 0.047 0.048 0.058 0.056 83

7/3/2009 0.041 0.041 0.044 0.039 0.039 0.040 0.046 0.044 81

7/4/2009 0.048 0.049 0.049 0.047 0.045 0.045 0.050 0.048 82

7/5/2009 0.045 0.049 0.050 0.040 0.046 0.044 0.049 0.048 0.054 78

7/6/2009 0.052 0.054 0.057 0.058 0.058 0.054 0.054 0.068 0.059 85

7/7/2009 0.061 0.064 0.065 0.059 0.064 0.060 0.061 0.065 0.067 86

7/8/2009 0.037 0.039 0.038 0.042 0.036 0.035 0.038 0.043 0.040 80

7/9/2009 0.046 0.048 0.045 0.037 0.049 0.047 0.050 0.041 0.046 80

7/10/2009 0.054 0.056 0.055 0.043 0.061 0.060 0.062 0.049 0.053 79

7/11/2009 0.043 0.042 0.047 0.045 0.046 0.045 0.046 0.056 0.050 79

7/12/2009 0.045 0.047 0.050 0.053 0.049 0.046 0.047 0.054 0.048 85

7/13/2009 0.049 0.048 0.048 0.047 0.054 0.054 0.052 0.048 0.053 82

7/14/2009 0.053 0.054 0.051 0.049 0.052 0.053 0.053 0.057 0.055 83
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7/15/2009 0.070 0.069 0.068 0.066 0.072 0.069 0.070 0.064 0.070 86

7/16/2009 0.058 0.058 0.077 0.069 0.077 0.057 0.061 0.059 0.066 89

7/17/2009 0.049 0.051 0.061 0.059 0.055 0.053 0.057 0.062 0.060 85

7/18/2009 0.047 0.047 0.045 0.052 0.045 0.044 0.047 0.052 0.051 82

7/19/2009 0.041 0.042 0.046 0.047 0.044 0.042 0.044 0.051 0.051 83

7/20/2009 0.056 0.053 0.058 0.051 0.058 0.064 0.060 0.052 0.058 83

7/21/2009 0.037 0.034 0.037 0.045 0.037 0.034 0.034 0.036 0.036 76

7/22/2009 0.053 0.048 0.053 0.045 0.048 0.054 0.053 0.048 0.055 84

7/23/2009 0.030 0.030 0.027 0.026 0.031 0.029 0.035 0.034 77

7/24/2009 0.050 0.051 0.047 0.050 0.048 0.050 0.058 0.058 81

7/25/2009 0.059 0.050 0.057 0.061 0.056 0.054 0.053 0.056 0.057 86

7/26/2009 0.058 0.049 0.052 0.054 0.054 0.054 0.049 0.054 0.055 88

7/27/2009 0.054 0.045 0.051 0.045 0.059 0.056 0.047 0.047 0.049 86

7/28/2009 0.055 0.045 0.055 0.056 0.048 0.053 0.048 0.050 0.051 87

7/29/2009 0.050 0.041 0.045 0.045 0.040 0.041 0.050 0.044 87

7/30/2009 0.058 0.054 0.053 0.057 0.054 0.053 0.053 0.063 0.059 87

7/31/2009 0.045 0.037 0.041 0.042 0.037 0.039 0.040 0.041 88

8/1/2009 0.058 0.050 0.052 0.045 0.045 0.050 0.052 0.052 84

8/2/2009 0.040 0.033 0.039 0.031 0.037 0.036 0.034 80

8/3/2009 0.055 0.054 0.048 0.054 0.058 0.055 0.062 85

8/4/2009 0.047 0.053 0.044 0.051 0.050 0.050 0.053 86

8/5/2009 0.059 0.059 0.065 0.056 0.054 0.057 0.067 85

8/6/2009 0.030 0.028 0.025 0.034 0.034 0.030 0.031 0.024 78

8/7/2009 0.045 0.044 0.044 0.043 0.043 0.043 0.047 0.045 81

8/8/2009 0.062 0.056 0.060 0.058 0.060 0.065 0.046 0.058 82

8/9/2009 0.048 0.057 0.044 0.040 0.045 0.053 0.050 87

8/10/2009 0.061 0.064 0.052 0.051 0.055 0.070 0.067 93

8/11/2009 0.055 0.061 0.064 0.055 0.054 0.055 0.069 0.059 88

8/12/2009 0.043 0.056 0.052 0.051 0.049 0.045 0.050 0.048 88

8/13/2009 0.025 0.049 0.045 0.046 0.041 0.029 0.036 0.036 78

8/14/2009 0.058 0.058 0.051 0.049 0.049 0.063 0.058 0.071 84

8/15/2009 0.077 0.069 0.061 0.057 0.065 0.059 0.070 0.062 0.067 87

8/16/2009 0.063 0.059 0.059 0.068 0.065 0.058 0.064 0.071 0.074 88

8/17/2009 0.068 0.062 0.058 0.047 0.061 0.060 0.063 0.063 0.069 90

8/18/2009 0.064 0.049 0.055 0.046 0.060 0.054 0.054 0.054 90

8/19/2009 0.054 0.051 0.059 0.049 0.056 0.052 0.059 0.058 88

8/20/2009 0.046 0.037 0.048 0.046 0.043 0.039 0.043 0.046 0.041 90

8/21/2009 0.048 0.034 0.043 0.045 0.039 0.033 0.033 0.040 0.035 92

8/22/2009 0.046 0.034 0.040 0.040 0.038 0.036 0.038 0.030 0.037 87

8/23/2009 0.049 0.041 0.045 0.046 0.042 0.039 0.041 0.049 0.047 86

8/24/2009 0.045 0.046 0.046 0.045 0.043 0.047 0.060 0.048 86
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8/25/2009 0.046 0.048 0.046 0.048 0.043 0.049 0.058 0.055 85

8/26/2009 0.057 0.060 0.064 0.055 0.056 0.057 0.064 0.061 87

8/27/2009 0.039 0.065 0.050 0.046 0.044 0.037 0.042 0.039 84

8/28/2009 0.030 0.041 0.041 0.033 0.032 0.034 0.041 0.035 76

8/29/2009 0.024 0.037 0.024 0.032 0.029 0.027 0.032 0.031 82

8/30/2009 0.046 0.047 0.053 0.045 0.044 0.046 0.053 0.051 83

8/31/2009 0.028 0.017 0.029 0.027 0.025 0.027 0.028 0.025 75

9/1/2009 0.040 0.015 0.045 0.038 0.039 0.041 0.042 0.035 75

9/2/2009 0.056 0.021 0.048 0.064 0.061 0.058 0.052 0.054 77

9/3/2009 0.055 0.045 0.039 0.038 0.055 0.055 0.048 0.040 0.044 79

9/4/2009 0.056 0.051 0.045 0.065 0.047 0.046 0.051 0.058 0.055 82

9/5/2009 0.057 0.051 0.049 0.052 0.051 0.049 0.052 0.059 0.054 86

9/6/2009 0.047 0.033 0.037 0.054 0.044 0.042 0.034 0.029 0.032 79

9/7/2009 0.033 0.024 0.026 0.034 0.025 0.025 0.027 0.027 0.026 74

9/8/2009 0.032 0.028 0.025 0.037 0.032 0.035 0.033 0.032 0.030 74

9/9/2009 0.038 0.032 0.031 0.039 0.033 0.030 0.030 0.029 0.030 74

9/10/2009 x 0.026 0.029 0.029 0.030 0.029 0.024 0.029 0.029 71

9/11/2009 0.034 0.020 0.019 0.022 0.020 0.019 0.019 0.026 0.019 65

9/12/2009 0.023 0.014 0.012 0.015 0.014 0.013 0.013 0.019 0.016 68

9/13/2009 0.046 0.035 0.033 0.032 0.036 0.034 0.037 0.040 0.039 80

9/14/2009 0.051 0.042 0.043 0.046 0.044 0.042 0.041 0.045 0.044 80

9/15/2009 0.05 0.039 0.038 0.041 0.040 0.040 0.041 0.043 0.043 82

9/16/2009 0.028 0.015 0.019 0.029 0.018 0.020 0.012 0.024 0.020 70

9/17/2009 0.027 0.014 0.018 0.028 0.018 0.018 0.012 0.024 0.018 66

9/18/2009 0.044 0.031 0.025 0.031 0.038 0.037 0.030 0.034 0.029 75

9/19/2009 0.035 0.032 0.032 0.034 0.032 0.033 0.032 0.034 0.033 72

9/20/2009 0.053 0.048 0.046 0.045 0.051 0.053 0.049 0.049 0.052 71

9/21/2009 0.045 0.035 0.037 0.037 0.038 0.039 0.037 0.036 0.040 76

9/22/2009 0.038 0.025 0.035 0.034 0.031 0.030 0.030 0.032 0.030 76

9/23/2009 0.050 0.026 0.033 0.030 0.037 0.035 0.026 0.029 0.028 81

9/24/2009 0.057 0.044 0.047 0.049 0.041 0.041 0.045 0.043 83

9/25/2009 0.033 0.028 0.028 0.034 0.030 0.029 0.029 0.029 0.030 76

9/26/2009 0.034 0.026 0.028 0.030 0.028 0.028 0.030 0.027 0.028 68

9/27/2009 0.041 0.030 0.031 0.030 0.031 0.029 0.027 0.030 0.030 75

9/28/2009 0.054 0.041 0.041 0.047 0.042 0.040 0.041 0.046 0.043 78

9/29/2009 0.031 0.026 0.026 0.033 0.026 0.024 0.024 0.026 68

9/30/2009 0.023 0.018 0.022 0.023 0.021 0.020 0.016 0.016 66

10/1/2009 0.034 0.031 0.030 0.030 0.031 0.030 0.030 0.031 0.030 60

10/2/2009 x 0.036 0.039 0.043 0.039 0.039 0.040 0.039 0.038 68

10/3/2009 x 0.037 0.036 0.040 0.041 0.042 0.035 0.035 0.038 74

10/4/2009 x 0.041 0.038 0.040 0.039 0.039 0.041 0.047 0.043 74
Delaware Brandywine 2009 ozone data substitution analysis Page | 13

10/5/2009 x 0.024 0.025 0.028 0.024 0.023 0.022 0.024 0.023 69

10/6/2009 x 0.029 0.031 0.030 0.031 0.031 0.030 0.032 0.031 67

10/7/2009 x 0.031 0.030 0.032 0.031 0.030 0.029 0.032 0.030 72

10/8/2009 x 0.029 0.030 0.031 0.030 0.029 0.028 0.029 0.029 67

10/9/2009 0.047 0.048 0.047 0.049 0.046 0.048 0.049 79

10/10/2009 x 0.024 0.021 0.024 0.024 0.024 0.024 0.023 0.024 71

10/11/2009 x 0.033 0.031 0.035 0.031 0.032 0.033 0.034 0.034 65

10/12/2009 x 0.019 0.023 0.027 0.020 0.017 0.023 0.026 0.021 55

10/13/2009 x 0.031 0.030 0.033 0.031 0.029 0.028 0.030 0.028 68

10/14/2009 x 0.020 0.020 0.023 0.023 0.022 0.018 0.024 0.020 53

10/15/2009 x 0.013 0.010 0.025 0.015 0.012 0.020 0.011 49

10/16/2009 x 0.015 0.012 0.020 0.018 0.017 0.013 0.018 0.013 45

10/17/2009 x 0.021 0.020 0.019 0.023 0.022 0.021 0.020 0.016 46

10/18/2009 x 0.026 0.027 0.024 0.030 0.029 0.026 0.024 0.024 51

10/19/2009 x 0.030 0.029 0.031 0.031 0.032 0.029 0.027 0.026 57

10/20/2009 x 0.027 0.023 0.037 0.026 0.031 0.019 0.035 0.027 67

10/21/2009 0.043 0.032 0.044 0.044 0.038 0.037 0.038 75

10/22/2009 x 0.026 0.031 0.049 0.033 0.032 0.023 0.044 0.037 73

10/23/2009 0.023 0.019 0.024 0.038 0.023 0.023 0.025 0.029 0.027 67

10/24/2009 0.026 0.025 0.026 0.030 0.027 0.027 0.026 0.030 0.029 73

10/25/2009 0.034 0.030 0.029 0.028 0.031 0.031 0.030 0.027 0.028 62

10/26/2009 0.025 0.023 0.028 0.034 0.026 0.024 0.027 0.032 0.028 62

10/27/2009 0.013 0.014 0.017 0.031 0.019 0.013 0.007 0.029 0.011 60

10/28/2009 0.021 0.020 0.021 0.030 0.022 0.021 0.017 0.030 0.022 68

10/29/2009 0.018 0.017 0.013 0.026 0.018 0.018 0.019 0.021 0.014 57

10/30/2009 0.032 0.028 0.032 0.034 0.033 0.033 0.033 0.034 0.033 58

10/31/2009 0.027 0.026 0.024 0.032 0.025 0.026 0.026 0.035 0.029 71
Delaware Brandywine 2009 ozone data substitution analysis Page | 14

APPENDIX C- Data

See attached CD for:

(1) Monthly weather data

(2) AMP 435 reports (zip files)