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City of Stockton A68104.02A <br /> August 28, 1996 Page A-3 <br /> organic vapors in the atmosphere at the site The background concentrations are measured <br /> in a location upwind and removed as possible from sources of organic vapors on the site. <br /> When background concentrations of organic vapors register as "0 0" on the PID, subsequent <br /> readings of "0 0" registered from samples tested in the field are recorded as "ND" (not <br /> detected). When background concentrations of organic vapors register at some quantity <br /> above "0 0", subsequent readings registered from samples tested in the field at or below this <br /> value are recorded as "B/G" (background) <br />