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Review Of ATSDR Spring Valley Exposure Investigations

Slide 1

Review Of ATSDR
Spring Valley Exposure Investigations


Slide 2

Susan W. Metcalf, MD.
Agency For Toxic Substances
And Disease Registry


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

Slide 4

Child Development Center

  • Soil arsenic levels
    - 57 ppm average
    - 498 ppm highest hit
  • Children immediately relocated
Slide 5

Results Of Hair Analysis

  • 24 samples: no arsenic detected
  • 8 samples: 0 .10ppm to 0 .14 ppm arsenic
Slide 6

Background Hair Arsenic Levels

  • Textbooks: < 1 ppm
  • National Research Council 0.2 ppm
  • NCEH: 95th percentile: 0.28 ppm
Slide 7

Spring Valley I


  • 20 homes with the highest composite samples
    -62-202 ppm
  • Arsenic analyzed
    -Hair
    -Urine
    -House dust

Slide 8

Spring Valley I Results

  • Hair samples
     -6 non-detects
     -19 (.07-.73 ppm)
  • House dust samples< -13 homes
    -0-63 ppm
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
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
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
Slide 12

Spring Valley II


  • Total urine arsenic
    -Range 0-76 µg/L
  • Speciated urine arsenic
    -10, 14, 29 µg/L


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

Slide 14

Spring Valley I & II


  • 19 participants
    -Urinary arsenic measured in both investigations

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

Slide 16

Individual 1

Total As (µg/L)

Inorganic As (µg/L)
EI I
94
15
EI 2
---
Non Detect

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)



Slide 18

Conclusions


  • All the arsenic levels found in our testing are below those associated with health problems

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