Appendix I Response to APAC comment

North Carolina Department of Environment and Natural Resources DIVISION OF AIR QUALITY William G. Ross Jr., Secretary Michael F. Easley, Governor B. Keith Overcash, P.E., Acting Director August 21, 2002 Mr. Stephen G. Zemba, Ph.D., P.E. Ms. Laura C. Green, Ph.D., D.A.B.T. Cambridge Enviromental, Inc. 58 Charles Street Cambridge, Massachusetts 02141 Subject: Response to Comment on the Draft Salisbury Air Quality Monitoring Study Dear Mr. Zemba and Ms. Green: Thank you for your July 12, 2002 memorandum in which you provided comment on the reported estimates of hydrogen sulfide (H S) emissions from the APAC hot-mix asphalt (HMA) plant. For 2several reasons you felt that the HS emission estimates produced from our monitoring survey 2were unreliable and should not appear in the final version of the subject report. After review of your comments and our discussion with the manufacturer of the HS monitor, we feel that the 2data should still be presented as preliminary estimates in the final report. However, we do recognize value in other points that you made and will incorporate these as changes in the final report. One of these points is to present the estimated HS data to one significant figure, 2considering that the nature of the procedures and ensuing data was an order-of-magnitude estimate of HS emissions from hot-mix asphalt plants. Below is our response to each individual 2comment in the order that you raised. ...