Slide 1
Review Of ATSDR
Spring Valley Exposure Investigations
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Slide 2
Susan W. Metcalf, MD.
Agency For Toxic Substances
And Disease Registry
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Slide 3
Exposure Investigations
| Date | Participants | | AU Child Development Center | Feb 2001 | 28 children
4 adults | | Spring Valley I | March 2002 | 23 adults
9 children | | Spring Valley II | July-Nov 2002 | 34 adults
6 children |
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Slide 4
Child Development Center
- Soil arsenic levels
- 57 ppm average
- 498 ppm highest hit - Children immediately relocated
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Slide 5
Results Of Hair Analysis
- 24 samples: no arsenic detected
- 8 samples: 0 .10ppm to 0 .14 ppm arsenic
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Slide 6
Background Hair Arsenic Levels
- Textbooks: < 1 ppm
- National Research Council 0.2 ppm
- NCEH: 95th percentile: 0.28 ppm
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Slide 7
Spring Valley I
- 20 homes with the highest composite samples
-62-202 ppm - Arsenic analyzed
-Hair
-Urine
-House dust
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Slide 8
Spring Valley I Results
- Hair samples
-6 non-detects
-19 (.07-.73 ppm)
- House dust samples< -13 homes
-0-63 ppm
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Slide 9
Spring Valley I Results
- Total urine arsenic
-Range 0-210 µg/L
- Speciated urine arsenic
-10,12,15 µg/L
- BEI : 35 µg/L
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Slide 10
Spring Valley I Conclusions
- Urine and hair arsenic levels are consistent with background exposure
- These levels would not be expected to be associated with health problems
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Slide 11
Spring Valley II: Eligibility
- Participation in previous EI
- Living on or adjacent to properties as they were being remediated
- Single elevated level of arsenic on property
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Slide 12
Spring Valley II
- Total urine arsenic
-Range 0-76 µg/L - Speciated urine arsenic
-10, 14, 29 µg/L
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Slide 13
Spring Valley II Conclusions
- Overall, there was no significant arsenic exposure in the population
- 3 individuals had measurable levels of inorganic arsenic that would not be expected to cause health problems
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Slide 14
Spring Valley I & II
- 19 participants
-Urinary arsenic measured in both investigations
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Slide 15
Spring Valley I & II
Speciated Arsenic
- 17/19 participants
-Speciated arsenic < 10 µg/L in both investigations - 2 individuals
-Speciated arsenic >10 µg/L in at least one investigation
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Slide 16
Individual 1
| Total As (µg/L) | Inorganic As (µg/L)
| EI I
| 94
| 15
| EI 2
| ---
| Non Detect
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Slide 17
Individual 2
| Total As (µg/L) | Inorganic As (µg/L)
| EI I
| 26
| 12
| EI 2
| 34
58
| Non Detect
29 (13.4 µg/g creatinine)
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Slide 18
Conclusions
- All the arsenic levels found in our testing are below those associated with health problems
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