Document RJ5ndnZ6LGwKXXaDBjGd55Dw7

- AR R26~ 3756 Dyno Nobel Americas 3 (. Proc Mr. Jim Wills US EPA, OPPT, Chemical Control Division W1a2s0h0inPgetnonns,ylDvaCnia20A4v6e.0, NW, 7405M 007 pr RTE Mfg pt DYNO Dyno Nobel ONCEWe 2SODserigebiy Teho`Snalet:L8ak0eCi, Uah oFonca0c22o504m82 Date 21 June 2010 Re: Pentaerythritol Tetranitrate (PETN) Biodegradation Study Dear Mr. Willis: Please see attachedtheenclosedletter from the US Army Public Health Command (Provisional) [(USAPHC (Prov) that is respectfully submitted by Dyno Nobel Inc. The USAPHC (Prov) has decided to perform the biodegradation test on PETN using ASTM E 1625. U`mpooninrtoerviingewDoisfsotlhveemdeOtrhgoadn,itchCeayrpborno.pose a modification to ASTM E 1625 due to the impracticality of Regards Newt g8 Neal Olsen SPehnoinoer:D8i0r1e.c3t2o8/r.6E4n2v5ironment e-mail onelalsen@am.dynonobceolm ce: Document Control Office (OPPT) USEPA 1R2m0064P2e8n,ns7y4l0va7nMia Ave., NW Washington, DC 20460 Catherine Roman U12S0E0PPAennsylvania Ave., NW 7405M Washington, DC 20460 ns S22 <g CONTAINS NO@RIFERET iil i enemas a aie ae : p2 GE &gST,3 Gg) Teme US ARDMEYPPUABLRSI1TC58MHBEELALNATCTHKHCOAOFWMKMTARHNODEAD(APRROVMISYIONAL) SNE 14,2010 Directorate of Laboratory Sciences Mr. Jim Wills Director, Chemical Control Division Office of Chemical Safety and Pollution Prevention MUCS E7n1v0i1ronmental Protection Agency 1200 Pennsylvania Avenue, NW. Washington, District of Columbia 20460 Dear Mr. Wills: "This letter is provided in response to your letter dated March 02, 2010 regarding the incorrect application of ASTM E1279 for the determination of the biodegradation of ePnetnittaleerdyt"hTieisttoilngteotfraCneirtrtaatien(HPiEgThNP,roCdAuScti7o8n-V11o-l5u)mteo CmheeemtictahelsT"S(C71AFseRct1i3o7n084).tesTtwroule gmueitdheolidnsestowsearleisfcyittehdewitteshtinrutlheealnetdtear,voAiSdTviMol1at6i2o5n oafntdheIStOest98r8u8le, satsatbeedining4a0ppCroFpRriate 79059 Am`yThCeeUnSteArrfmoryHPeuablltihc PHreoamlotthiCoon mamndanPdrev(PernotviivseioMneadl)ic[iUneSA(PUHSCAC(HPProPvM)),,foDrimreercltyorUaSte of Laboratory Sciences (DLS) has determined that due to the extremely low solubility of PETN in aqueous solution and its low percent carbon by mass, the application of ISO 9888 to determine biodegradation is not practical. `The USAPHC (Prov), DLS proposes 0 establish the biodegradability of PETN using ASTM E1625-94(2008), "Standard Test Method for Determining Biodegradabilty of sOercgtainoinc1C.3heamnidca8l.2s, isntSateemit-haCtonotthienruo"supsecAicftiicvcatheedmiSclauldagneal(ySsCiAsS")m".ayAbSeTuMtlEi1ze6d25f-or94t,est chemicals. Since monitoring Dissolved Organic Carbon (DOC) is not praciical for the degradationof PETN in aqueous solution; USAPHC (Prov) proposes to only monitor the PETN concentration using a quantitative method as permitted in section 8.2.5, and report results as described in section 13.2.6oftheASTM method. If no apparent loss of PETN is observed after the fist twelve weeks of the study, the Study will be terminated. Upon conclusionofthis study, a final report will be generated following section 13 of ASTM E1625-94(2008) with the exclusion of 13.2.5 (DOC removal). LE pa 2 We request concurrence from your office that the proposed method and procedures as described above meet the requiremeonft4s0 CFR 790.59 and 71 FR 13708. The point of contact for this action is Mr. David Morrow, (410) 436-2637, email david. morrow2@us.army.mil. Sincerely, ZH. 3 Richard P. Duncan, Ph.D. Lieutenant Colonel, US Army Director, Laboratory Sciences