p.1 

OAR Box 1830 

Prepped by Ollie Stewart 

Document Number: 

146) IV-C-113 

Docket Number: 

A-87-11 

Printed 11/13/2008 7:20:59 AM Sheet 146 of 232 
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UNITED STATES ENVIR0NMENTA1^p^^^^lt|p!r W%2%Zm& 

MAR 2 3 1988 

Honorable Harris VJ. Fawell 

House of Representative s 

Vfashington, DC 20515 

Dear Mr. Fawell: 

This is in response to your March 1, 1988 letter 

expressinq the concerns of your constituents regarding the EPA 

rulemaking proposals to control the volatility of summer 

gasoline and to require onboard canisters on new vehicles to 

control refueling emissions. In particular you were interested 

in the costs and benefits associated with each program and the 

status of EPA plans to implement such controls. 

In August 1987, EPA released these two proposed 

rulemakings and I have included the Federal Register Notices of 

Proposed Rulemaking (NPRM) for your information. Both 

proposals were based on an in-depth analysis of many issues. 

Section E (pages 31177-31182) of the refueling NPRM explains 

our overall rationale for proposing onboard controls over 

Stage II controls. Specifically, Tables 3 and 5 present the 

emission reductions, cost, and cost effectiveness of onboard 

and Stage II controls under the different assumptions for 

benefits and their value. 

We believe that control of gasoline volatility during the 

summer is a cost-effective program yielding a large reduction 

in hydrocarbon emissions. Section D (pages 31282-31292) of the 

volatility NPRM explains our overall rationale for proposing 

gasoline volatility controls. This section presents the 

emission reductions, cost, and cost-effectiveness of volatility 

controls for the various scenarios examined in the analysis. 
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ENVIRONMENTAL PROTECTION 

AGENCV 

MAY 2 0 I9CL" 

CENTRAL DOCKET 

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Regarding the status of EPA's plans to implement the 

onboard and gasoline volatility control rules, we are now in 

the process of reviewing the comments received during the 

public comment period which came to a close February 11, 1988. 

In the near future we will update our safety analysia of the 

onboard proposal in response to the comments received and 

provide the revised analysis to the Department of 

Transportation (DOT). After we receive DOT'S comments, we will 

repropose the refueling rule for public comment. Final 

rulemaking on both the refueling and volatility control 

proposals will be subsequent to the reproposal of the refueling 

rule. 

Thank you for your interest in both of these proposals. 

If you have further questions on either of the proposals please 

contact Phil Carlson of the Standards Development and Support 

Branch of the Emission Control Technology Division, 2565 

Plymouth Road, Ann Arbor, MI 48105 (FTS 374-8270 or Commercial 

(313) 668-4270). Your letter will be placed in the public 

dockets for the rulemakings. 

Sincerely yours, 

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• •J-oi.^Lj \j j*•>j:\jiij Tf.>T-T> 5Y 

DONALD Z. Z~<"i«C'~r\ 

Richard D. Wilson 

Director, Office of Mobile Sources 

Enclosures 

cc: Docket A-87-11 

Docket A-85-21