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                                             Poison A or B

           WTE$$$bi?Th$o~R SPRAY ... Water fog or spray applied to h~droc~%~acid   vapors or fumes may

                CONSEQUENCE
                  Water runoff may contain hydrocyanic acid from contact with its vapors or fumes.
                MITIGATION
                  Contain contaminated water and remove or neutralize as soon as possible to prevent spread of
                  contamination. Be alert to conditions such as fire hose runoff or rainwater that may add to spill
                  volume and overfill impoundments. Consult qualified experts for safe neutralizing techniques.
           TECHNIQUE
           ALCOHOL FOAM ... There is a possibility that alcohol foam applied to the surface of liquid pools may
             slow the release of hydrocyanic acid vapors into theatmosphere. (Note: The fact that alcohol foam is
             recommended for fire fightingsuggests it may also have value in suppressing vapor evolution.)
                CONSEQUENCE
                  The effects of alcohol foam may be short term. As the foam breaks down, release of vapors will
                  increase. Products of foam breakdown will add to the volume of spilled material.
                MITIGATION
                  Continue foam applications until spilled product is removed. Contain increased volume. Apply
                  alternative technique if response is ineffective. Proceed with caution.
           LAND SPILL

           TECHNIQUE

)          CONTAINMENT DIKES . . . Hydrocyanic acid may be contained by building dikes using soil, sand or
             other materials.
                CONSEQUENCE
                  Contained hydrocyanic acid may percolate into soil or seep through dike material. This may

                  result in loss of contained product and spread of contamination.
                MITIGA TION
                  Remove or neutralize contained product as soon as possible to prevent spread of contamination.
                  Be alert to conditions such as fire hose runoff or rainwater that may overfill impoundments.
                  Where possible, line collection area with compatible impervious materials.
           TECHNIQ UE
           EXCAVATION ... A trench or ditch may be excavated to contain leaking product.
                CONSEQUENCE
                  There may be increased potential for ground water contamination in some cases.
                MITIGA TION
                  Remove contained products as soon as possible to prevent spread of contamination. Use surface
                  dikes or barriers where groundwater contamination is possible or line collection basin with
                  compatible impervious material.
           TECHNIQUE
           PUMPING/VACUUM SUCTION ... Accumulated liquid pools may be recovered using appropriate
             hoses, pumps and storage containers or vacuum trucks.
                CONSEQUENCE
                  Equipment that is incompatible with the spilled product may become damaged or develop leaks.
                  High pressures may develop in equipment.
                MITIGATION
                  Use compatible equipment of proper pressure capacity.

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