Stresau Laboratory, Inc — Hazardous Materials Safety Interpretation

Page 1= U.S. Department of Transportation Washington, D.C. 400 Seventh Street, S.W. 20590 Research and Special Programs Administration FEB 5 998 Mr. Vince Mendoza Stresau Laboratory, Inc. N8265 Medley Road Spooner, WI 54801-7819 ! Dear Mr. Mendoza: This is in response to your recent facsimile and to confirm the interpretation we provided you in our phone conversation last week concerning the classification and testing of fertilizer. As : stated, the observation period for the UN Trough Test (Test for determining self-sustaining exothermic decomposition of fertilizers containing nitrates, Test S.1) is not 20 minutes. If propagation continues throughout the substance, the fertilizer is considered to meet the hazard of self-sustaining decomposition. Therefore, in your case where 4-6 hours transpired before propagation throughout the substance occurred, the product would be considered to meet the criteria for self-sustaining decomposition. I hope this information is helpful. If we can be of further assistance, please contact us. Sincerely, Director, Office of Hazardous Materials Standards#

Page 209/30/1997 08:05 9136777065 PAGE 01 STRESAU LABORATORY INC. Nộ265 Medlay Road, Spooner, WI 54801-7819, Tol. 715-835-2777, FAX 715-635-7979 FAX MESSAGE $53 Stresau Lab - Dunn Lake HazMat Test Dept. Ext. 166 Fax Number: 704000= 4979 (913) 677-7065 verification: 725763524297 (913) 677-3060 •FAX TO: MR: BOB RICNARDS COMPANY : DOT FAX NUMBER: 202-366-5713 FOLLOW UP NUMBER: - 202-366-0656 FROM: Vince Mendoza DATE: •30 55PT 97 # of pages . + cOVeI sheet = _ / pages HELLO MR: RICHAROS: FoLLowup Tö our CALL THI5 MoRNIng: I An. Sseking VEnIficopioN As to DOT's IntErprstAtIoN of THE CRITERA OF SELE SUSTAMAg DESOMpOSITiIN Pf A FERTILIZER N THS TRongh TEST, UN ToST S.1. PICASE Fax your DapArTManTS cOmmoNTS, TOnE AT THE ABOVE fAX NuMBEr. I An oN TRAvEL So THo NunBoR rs noT. my office. Thank you fur your Altontion • 5143 q9l#