PRESISTENCY TIMES OF CHEM AGENT ON CARC PAINTED VEH AND SAND

File: 082896_jul96_decls31_0002.txt
Page: 0002
Total Pages: 3

Subject: PRESISTENCY TIMES OF CHEM AGENT ON CARC PAINTED VEH AND SAND    

Box  ID: BX000409

Document Number:         70

Folder Title: TACTICAL OPERATIONS CENTER LOGS - MSG FILE LOGS  19-20 SEP 90                                   

Folder Seq #:          9

Unit: ARCENT      

Parent Organzation: CENTCOM     









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        PRIORITY             RULNEAA CDRCRDEC APG MD//SMCCR-OPA//


        D. NUSSE4 (NON-UNIFORM SIMPLE SURFACE EVAPORATION, REVISION 4)
        MODEL, UNDER DEVELOPMENT.
        1. AS REQUESTED IN REFERENCE As PERSISTENCY TIMES OF CHEMICAL
        AGENTS ON CARC PAINTED VEHICLES AND SAND ARE PROVIDED. THE
        PERSISTENCY TIMES ON CARC PAINT (TABLE 1) ARE BASED ON THE FM 3-4
        COORDINATING DRAFT. THE PERSISTENCY TIMES ON SAND (TABLE 2) ARE
        BASED ON MODELING RESULTS USING NUSSE4 METHODOLOGY, THE ARMY'S
        STANDARD MODEL FOR ATMOSPHERIC DISPERSION AND SURFACE EVAPORATION
        OF CHEMICAL AGENTS. SINCE NUSSE4 METHODOLOGY APPLIES ONLY TO
        GRASSLAND, A CORRECTION FACTOR OF 2.5 HAS BEEN APPLIED TO DERIVE
        THE RESULTS IN TABLE 2, AS RECOMMENDED IN FM 3-4. THE PERSISTENCY
        TIMES LISTED BELOW (FOR BOTH SURFACES) ARE THE TIMES TO ACHIEVE
        90 PERCENT EVAPORATION OF THE ORIGINAL CONTAMINATION.





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            TABLE 1: PERSISTENCY TIMES OF CHEMICAL AGENT ON
                       CARC  PAINTED VEHICLES
                             TEMP (DEG F)
            AGENT            50                77                110
            SF               9 HR              4 HR              I HR
            GA (OR HD)       12 HR             5 HR              I HR
            BB               15 MIN            7 MIN             2 MIN
            TABLE 2: PERSISTENCY    TIMES OF CHEMICAL AGENT ON   SAND
                             TEMP (DEG F)
            AGENT            50                77                110
            SF               93 HRS            22 HRS            5 HRS
            GA (OR HD)       100 HRS           27 HRS            7 HRS
           < I HR
        2. WE    BELIEVE THESE ESTIMATES OF PERSISTENCY TO BE    SAFE-SIDED
        BASED ON THE PARTICLE SIZE ASSUMED IN FM 3-4. TO BE CONSERVATIVE,
        FM 3-4 USES A PARTICLE SIZE OF 2500 MICRONS (2.5 MM). WE BELIEVE
        THE LARGEST PARTICLE SIZES (FOR THE IDENTIFIED OPERATION DESERT
        SHIELD THREAT WEAPON SYSTEMS) WILL RANGE FROM 300 TO 1000 MICRONS
        (0.3 TO I MM). SINCE PARTICLE SIZE IS APPROXIMATELY PROPORTIONAL
        TO PERSISTENCY TIME, PERSISTENCY TIMES WOULD BE SHORTER FOR






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Document 3 f:/Week-28/BX000409/TACTICAL OPERATIONS CENTER LOGS - MSG FILE LOGS 19-20 SEP 90/presistency times of chem agent on carc painted :08239614362537
Control Fields 17
File Room = jul96_declassified
File Cabinet = Week-28
Box ID = BX000409
Unit = ARCENT
Parent Organization = CENTCOM
Folder Title = TACTICAL OPERATIONS CENTER LOGS - MSG FILE LOGS 19-20 SEP 90
Folder Seq # = 9
Subject = PRESISTENCY TIMES OF CHEM AGENT ON CARC PAINTED
Document Seq # = 37
Document Date =
Scan Date = 24-JUL-1996
Queued for Declassification = 01-JAN-1980
Short Term Referral = 01-JAN-1980
Long Term Referral = 01-JAN-1980
Permanent Referral = 01-JAN-1980
Non-Health Related Document = 01-JAN-1980
Declassified = 23-AUG-1996