CREATE TABLE table_name_30 (storage_stability INTEGER, field_stability VARCHAR(255), toxicity_as_blood_agent VARCHAR(255), agent VARCHAR(255))
What is the storage stability of Arsine with a toxicity of 8, and field stability less than 5?
    
SQL: SELECT MIN(storage_stability) FROM table_name_30 WHERE toxicity_as_blood_agent > 8 AND agent = "arsine" AND field_stability < 5