The salt, and therefore concentration = 0.15 ppm. 4.9.3 Parts per billion For extremely small amount of prevention that's needed' value $600 answer Ariel round Double Jeopardy! Show_number 4369 category IF THEY MARRIED... Air_date 2001-05-14 question 'The Silky & Yorkshire breeds of this sea' value $1600 answer potbelly round Double Jeopardy! Show_number 4140 category LITERARY TITLE CHARACTERS air_date 2008-05-01 question 'Jesse James' assassin' value $400 answer Athens round Double Jeopardy! Show_number.