Part 2 of 2, Molycorp, Washington, PA, Final Status Surveys for Buildings
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Appendix F Building 29 Data Package Molycorp Washington, PA Building 29 Data Package This data package contains final status survey information for Building 29, Molycorp, Washington, PA site. Field data collection forms, survey report forms, statistical test results, and comparisons to release limits are provided. Summary During the final status survey of Building 29, elevated radioactivity was identified in multiple localized areas on the concrete floor and on several structural support components of the building (purlins). The building's classification was changed from unaffected to affected, and an affected final status survey was performed. It was determined that the activity identified on the floor was fixed into the concrete, and required surface removal of the concrete in the identified areas. The activity identified on the purlins was also determined to be fixed contamination. The structural integrity of the building was evaluated without the affected purlins (removed due to fixed contamination). It was concluded that the purlins needed to remain in place until building demolition. The areas on the purlins, identified as contaminated, have been marked with a bright florescent paint and recorded as being contaminated in a log controlled by the project manager. These contaminated purlins will remain in place until just prior to building demolition. Remediation of the concrete was performed. All post-remedial surveys indicated that remediation activities were successful, and that all the affected concrete was removed. Elevated levels of background radiation, from soil radioactivity, continued to be a presence during survey activities of Building 29. Results from the final status survey of Building 29 provides evidence that release criteria have been met, demonstrates that residual radioactivity is below the unrestricted use criteria, and confirms that Building 29 is suitable for unrestricted use, excluding the contaminated purlins that will be removed just prior to building demolition. Results of Surface Scans Molycorp - Building 29 Survey Unit (Affected Area) Building Floor Location Beta Scan Beta Scan Alpha Scan Alpha Scan (see map) gross cpm net cpm gross cpm net cpm F1 1500 30 10 3.6 F2 1500 30 11 4.6 F3 1550 80 9 2.6 F4 1600 130 12 5.6 F5 1600 130 12 5.6 F6 1600 130 8 1.6 F7 1800 330 14 7.6 F8 1700 230 12 5.6 F9 1450 -20 13 6.6 F10 1650 180 10 3.6 F1l 1600 130 11 4.6 F12 1500 30 8 1.6 F13 1600 130 14 7.6 F14 1550 80 12 5.6 F15 1600 130 12 5.6 F16 1700 230 16 9.6 F17 1700 230 14 7.6 F18 12500 11030 26 19.6 F19 15000 13530 60 53.6 F20 1600 130 12 5.6 F21 1300 -170 12 5.6 F22 1700 230 10 3.6 F23 1750 280 15 8.6 F24 1700 230 12 5.6 F25 4000 2530 20 13.6 F26 12000 10530 16 9.6 F27 1800 330 14 7.6 F28 1800 330 11 4.6 F29 1700 230 12 5.6 F30 1650 180 8 1.6 F31 1600 130 13 6.6 F32 1900 430 15 8.6 F33 13000 11530 84 77.6 F34 5000 3530 22 15.6 F35 3600 2130 30 23.6 F36 2300 830 12 5.6 F37 1700 230 9 2.6 F38 1470 0 10 3.6 F39 1600 130 16 9.6 F40 1800 330 14 7.6 F41 1780 310 12 5.6 F42 1600 130 10 3.6 F43 1600 130 13 6.6 F44 1450 -20 8 1.6 F45 1600 130 11 4.6 F46 1700 230 12 5.6 Page 1 of 2 F47 1700 230 12 5.6 F48 2100 630 14 7.6 F49 1900 430 10 3.6 F50 20000 18530 100 93.6 F51 1820 350 14 7.6 F52 1700 230 10 3.6 F53 1550 80 12 5.6 F54 2000 530 14 7.6 F55 1600 130 12 5.6 F56 1600 130 11 4.6 F57 10000 8530 100 93.6 F58 3600 2130 26 19.6 F59 1830 360 12 5.6 F60 1600 130 12 5.6 F61 1600 130 15 8.6 F62 2400 930 14 7.6 F63 1950 480 10 3.6 F64 1800 330 11 4.6 F65 1600 130 12 5.6 F66 1700 230 14 7.6 F67 1600 130 12 5.6 F68 1600 130 12 5.6 F69 1800 330 10 3.6 F70 1700 230 13 6.6 F71 1500 30 14 7.6 F72 1700 230 12 5.6 F73 1800 330 14 7.6 F74 1600 130 15 8.6 F75 13000 11530 20 13.6 F76 6000 4530 15 8.6 F77 1980 510 12 5.6 F78 2000 530 13 6.6 F79 1650 180 11 4.6 F80 1700 230 15 8.6 F81 1620 150 12 5.6 F82 1900 430 10 3.6 F83 2000 530 12 5.6 F84 3200 1730 18 11.6 F85 2300 830 12 5.6 F86 2300 830 14 7.6 F87 1800 330 10 3.6 All floor scans performed with Ludlum 239-1 F (2350-1 No.95359) with 43-37 No. 92503 Floor Monitor Info: Scan MDA Beta - 188 dpm/detector area Scan MDA Alpha - 16 dpm/detector area Scan background Beta - 1470 cpm Scan background Alpha - 6.4 cpm ')etector Eff. Beta - .27 Oetector Eff. Alpha - .207 Page 2 of 2 Results of Surface Scans Molycorp - Building 29 Survey Unit (Affected Area) Building Walls (Interior) Location Beta Scan Beta Scan Alpha Scan Alpha Scan (see map) gross cpm net cpm gross cpm net cpm W1 300 36 0.6 -0.4 W2 265 1 0.6 -0.4 W3 225 -39 1 0 W4 265 1 1 0 W5 245 -19 0.2 -0.8 W6 250 -14 0.5 -0.5 W7 300 36 1.2 0.2 W8 260 -4 0.4 -0.6 W9 280 16 1 0 W10 300 36 1 0 WI1 220 -44 0.4 -0.6 W12 340 76 1.4 0.4 W13 290 26 1 0 W14 360 96 1.8 0.8 W15 360 96 1 0 W16 330 66 0.5 -0.5 W17 280 16 1 0 W18 290 26 0.4 -0.6 W19 300 36 1 0 W20 310 46 1.8 0.8 W21 320 56 1 0 W22 300 36 1.4 0.4 W23 280 16 0.8 -0.2 W24 300 36 1 0 W25 300 36 1 0 W26 330 66 1.8 0.8 W27 260 -4 1 0 W28 290 26 1 0 W29 270 6 2 1 W30 290 26 1.2 0.2 W31 340 76 1 0 W32 320 56 2 1 W33 300 36 1 0 W34 260 -4 1 0 W35 280 16 2 1 W36 280 16 2 1 W37 270 6 1.6 0.6 W38 260 -4 1.2 0.2 W39 240 -24 1 0 W40 260 -4 1 0 W41 280 16 1.4 0.4 W42 260 -4 2 1 W43 260 -4 1 0 W44 270 6 1 0 W45 280 16 0 -1 Page 1 of 2 W46 300 36 1.2 0.2 W47 310 46 2 1 W48 300 36 3 2 W49 290 26 0 -1 W50 280 16 1 0 W51 280 16 2 1 W52 270 6 1 0 W53 280 16 2 1 W54 260 -4 1 0 W55 260 -4 2 1 W56 240 -24 1 0 W57 250 -14 1 0 W58 240 -24 1 0 W59 200 -64 0 -1 W60 220 -44 0.6 -0.4 W61 220 -44 0.6 -0.4 W62 250 -14 0 -1 All interior wall scans performed with Ludlum 2350-1 No.117014 with 43-106 No. 133866: Scan MDA Beta - 620 dpm/detector area Scan MDA Alpha - 45 dpm/detector area Scan background Beta - 264 cpm Scan background Alpha - I cpm Detector Eff. Beta - .248 Detector Eff. Alpha - .211 Page 2 of 2 Results of Surface Scans Molycorp - Building 29 Survey Unit (Affected Area) Building Interior Bathroom Location Beta Scan Beta Scan Alpha Scan Alpha Scan (see map) gross cpm net cpm gross cpm net cpm WI 300 36 2 W2 280 16 2 1 01 W3 340 76 2 W4 320 56 1 0 F1 350 86 2 C1 300 36 1 0 C2 280 16 1 0 All bathroom scans performed with Ludlum 2350-1 No.117014 with 43-106 No. 133866: Scan MDA Beta - 620 dpm/detector area Scan MDA Alpha - 45 dpm/detector area Scan background Beta - 264 cpm Scan background Alpha - I cpm Detector Eff. Beta - .248 Detector Eff. Alpha - .211 Page 1 of 1 Results of Surface Scans Molycorp - Building 29 Survey Unit (Affected Area) Building Ceiling (Interior) Location Beta Scan Beta Scan Alpha Scan Alpha Scan (see map) gross cpm net cpm gross cpm net cpm C1 260 -4 0 -1 C2 260 -4 0 -1 1 C3 280 16 0 C4 280 16 1 0 C5 280 16 0 C6 260 -4 0 -1 C7 290 26 0 -1 C8 270 6 1.4 0.4 C9 280 16 1 0 C10 270 6 1.2 0.2 C11 280 16 1 0 C12 260 -4 0 -1 C13 280 16 1.4 0.4 C14 290 26 1.6 0.6 C15 290 26 0 -1 C16 290 26 1 0 C17 280 16 2 1 C18 270 6 1 0 C19 270 6 1 0 C20 280 16 2.2 1.2 C21 270 6 1.2 0.2 C22 280 16 2 1 C23 280 16 2 1 C24 290 26 1 0 All ceiling scans performed with Ludlum 2350-1 No.117014 with 43 106 No.