Mr. Richard VanFrank commented that any testing of road dust suppressants would have to address possible ground and surface water contamination issues. Mr. Clapsaddle said these issues are addressed in the protocol. Mobile Diesel Engines Mr. Anthony Erb, EPA Office of Transportation and Air Quality, gave an overview of OTAQ's Voluntary Diesel Retrofit Program. Dr. VanOsdell gave an overview for Mobile Diesel Engines. The Technical Panel has met four times to date.
Several issues remain to be resolved regarding the protocol before verification testing can begin.
The biggest issues are the amount of testing to be required under the verification protocol, the use of preexisting data, the use of manufacturers' laboratories, and how to handle engineering running changes. Mr. Van Frank inquired whether the protocol is considering possible increases in HAP emissions. Dr. VanOsdell replied that the topic was discussed and the Technical Panel decided against including HAP measurements for as a verification requirement for several reasons. There was no federal regulatory driver for speciation testing, there are no standards for speciation testing, and the methods currently available are expensive and would require significant additional development to be included in the protocol.