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
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|
Date |
Participants
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| 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
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Total
As (µg/L)
|
Inorganic
As (µg/L)
|
EI
I
|
26
|
12
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EI
2
|
34
58
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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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