OAR Box 1112 

Prepped by RyanDugan 

Document Number: 

19) II-B-8 

Docket Number: 

A-83-22 

Printed 4/16/2008 9:12:06 AM 

i 

Sheet 19 of 97 

p.1 
P.2 

Op* 6081 ""* . 

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

Office of Air Quality Planning and Standards 

/ Research Triangle Park, North Carolina 27711 

OCT 2 2 1985 

MEMORANDUM 

SUBJECT: Comparison of Four Alternative Lead Air Quality Standards 

Using Modelled Data at a Secondary Lead Smelter and a 

Battery Plant y < . ~\ 

'//' '/'Ay 

FROM: William F. Hunt, Jr. /• Ub*-vJ - /^"'*' fChief, Data Analysis Section (MD-14) ' 

TO: John Haines, Chief 

Standards Development Section B (MD-12) 

Modelled quarterly and monthly average lead data were taken from 

the SAI Report, An Evaluation of Alternative Forms of the National 

Ambient Air Quality Standard for Lead to compare four alternative forms 

of the lead standard: 

Option 1. Maximum quarterly (monthly) average - Computationally, you 

choose the highest quarterly/monthly average over a 

3-year period. 

Option 2. Expected maximum calendar quarter (month) - Computationally, 

you compute the average over 3 years for each calendar 

quarter/monthly average (i.e. average all the first quarters, 

all the second quarters, etc. or all the Januarys, Februarys, 

etc.). 

Option 3. Expected maximum quarter (month) - Computationally, you 

choose the maximum quarterly or monthly average in each 

calendar year and average these maximum quarters or 

months. 

Option 4. Expected highest N quarters (months) - Computationally, this 

gives the same answer as option 3, unless a single year 

contains two or more of the 3 highest quarters. 

The modelled data were taken from Appendices A, B, C, and D of the 

report for every day monitoring. The data can be found on page A-2 for 

quarterly averages around a secondary lead smelter, on page B-2 for monthly 

averages around a secondary lead smelter, on page C-2 for quarterly 

averages around a lead battery plant and page D-2 for monthly averages 
P.3 

around a lead battery plant. The meteorological data base for the lead 

smelter case covered the years 1964 and 1974 through 1978, while the 

meteorological data base for the lead battery plant covered the years 

1965 through 1971. 

We have assumed that, if models are to be used in determining 

possible control actions, the modeling would be done on an every day 

basis. Table 1 compares the modelled quarterly and monthly averages 

around the secondary lead smelter for each of the 3-year periods of 

meteorological data ending in the years 1975, 1976, 1977, and 1978. 

Similarly, Table 2 compares the modelled quarterly and monthly data at 

the lead battery plant for each of the 3-year periods of meteorological 

data ending in the years 1967, 1968, 1969, 1970, and 1971. 

In both tables, two additional columns have been added. The first 

column is the averages of all 3-year period design values and is the 

principal focus of this memo for comparing the four alternative design 

values; The last column describes the percent difference between the 

most stringent form of the standard - the maximum quarter or month over 

the 3-year period (Option 1) and the other three forms of the standard. 

OBSERVATIONS 

As would be expected, the next most stringent forms of the air 

quality standards are in rank order: 

Option 4. the expected highest N quarters or months, 

Option 3. the expected maximum quarter (month), 

Option 2. the expected maximum calendar quarter (month). 

I will be happy to discuss any questions you might have regarding 

this memo. 

Attachments 

cc: R. Rhoads (MD-14) 

R. Neligan (MD-14) 

J. Cohen (MD-12) 

D. Sledge (MD-12) 

R. Faoro (MD-14) 

N. Frank (MD-14) 
P.4 

Table 1. Comparison of Four Alternative Standard Design Values 

of Modelled Quarterly and Monthly Averages Around a 

Secondary Lead Smelter 

^trarterly 

Design Value 

Max. Quarterly Avg. 

Exp. Max. Cal. Qtr. 

Exp. Max. Qtr. 

Exp. Highest 3 Qtrs. 

3-Year Record Ending i n 

1975 1976 1977 1978 

Average of al l % Reduction i n 

3-Year Periods Design Value 

4.42 

3.49 

3.49 

3.80 

4.42 

4.04 

4.04 

4.04 

4.42 

3.88 

3.92 

3.92 

3.72 

3.50 

3.54 

3.61 

4.25 

3.73 

3.75 

3.84 

0 

-14% 

-13% 

-11% 

Monthly 

Design Value 

Max. Monthly Avg. 

Exp. Max. Cal. Month 

Exp. Max. Month 

Exp. Highest 3 Months 

5.07 5.07 5.07 4.86 

3.95 4.55 4.50 4.12 

4.38 4.82 4.73 4.55 

4.66 4.82 4.81 4.71 

5.02 

4.28 

4.62 

4.75 

0 

-17% 

-9% 

-6% 
P.5 

Table 2. Comparison of Four Alternative Standard Design Values 

of Modelled Quarterly and Monthly Averages Around a 

Lead Battery Pl ant 

Quarterly 

Design Value 

Max. Quarterly Avg. 

Exp. Max. Cal. Qtr. 

Exp. Max. Qtr. 

Exp. Highest 3 Qtrs. 

Monthly 

Design Value 

3-Year Record Ending 

1967 1968 1969 1970 

0.73 

0.63 

0.67 

0.70 

0.68 

0.64 

0.64 

0.64 

0.85 

0.71 

0.71 

0.71 

0.85 

0.72 

0.72 

0.72 

in 

1971 

0.85 

0.70 

0.70 

0.71 

Average of 

3-Year Pen 

0.79 

0.68 

0.69 

0.70 

a l l 

ods 

% Reduction in 

Design Value 

0 

-16% 

-14% 

-13% 

Max. Monthly Avg. 1.03 1.03 1.08 1.08 1.08 

Exp. Max. Cal. Month 0.91 0.90 0.85 0.90 0.81 

Exp. Max. Month 0.91 0.90 0.92 0.90 0.96 

Exp. Highest 3 Months 0.94 0.93 0.95 0.93 0.97 

1.06 

0.87 

0.92 

0.94 

0 

-22% 

-15% 

-13%