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period of one year. This proposal was approved Ly Radiation <br />Control and monitoring began on April 1, 1988. The one year <br />monitoring period was completed in 1989 and the average <br />annual background gamma radiation exposure for the ten <br />locations studied was 184 mRem. <br />A gamma dose is not attributed 1.o the licensed facilities and <br />is not includc,.i in the offsitr. close commitment I;ecause the <br />background study data of 184 mRam/yr exceeds the ]59 mRem/yr <br />from monitoring data collected from January throuyh December <br />1993 for the environmental sampling location (20S) wt,ich <br />approximates the nearest feasible resident. <br />B. Inhalation <br />Airborne particulate sampling was conducted throughout the <br />January through December 1993 period at the location <br />proximate to the northeast property boundary (205) using a <br />continuously-operated high-volume air sampler. Average <br />annual particulate concentrations at this location were: <br />Unat: 3.65E-5 pCi/m3 <br />Th230: 4.83E-5 pCi/m3 <br />Ra226: 4.24E-5 pCi/m~ <br />Average annual particulate concentrations at th~~ Lacl;yround <br />location offsrte on Pine Ridge Road (204) were: <br />UnaC: 5.47E 5 pCi/mi <br />Th230: 4.00E 5 pCi/m~ <br />Ra226: 4.66E-5 pCi/mj <br />Subtracting the background concentrations frorr,tl~e gross <br />concentrations obtained at the assessment location leaves <br />net concentrations of: <br />Unat: -1.82E-5 pCi/m3 <br />Th230: 0.83E-5 pCi/m3 <br />Ra226: -4.20E-6 pCi/m3 <br />Note: Values less than the detection limit were computed as <br />the LLD value. <br />