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El Dorado Hills, Naturally Occurring Asbestos
Multimedia Exposure Assessment
Preliminary Assessment and Site Inspection Report Interim Final

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El Dorado Assessment home 4.0 Regulatory Involvement 8.0 Summary Appendices References
1.0 Introduction 5.0 Summary of Investigative Efforts Acronyms Definitions
2.0 Apparent Problem 6.0 Hazard Ranking System Factors Appendices & References
3.0 Site Location, Description & History 7.0 Emergency Response Considerations

Summary of Investigative Efforts, cont.

5.4 Air Sampling

5.4.2.6 Jackson Elementary School

The START conducted activity-based air sampling during three scenarios at the garden and outdoor classroom, the grass-covered playing field, and two paved play areas. Because the paved play areas selected for the activity were physically separate from one another, the START placed additional high-flow air sample pumps in stationary positions in each area, but only operated them within each area for the 1 hour of the scenario when activity was conducted there.

Table 5-26
New York Creek Nature Trail Jogging/Walking Scenario B Air Sample Summary Results
Sample ID Location Location Description Date PCME Structures (s/cc) AHERA-like Total Structures (s/cc) Sensitivity (s/cc)
JOGB-H2-1TR-100704 JOGB-1TR trail position #JOG1 hi-vol 10/07/04 0.00290 0.00484 0.000968
JOGB-H2-2TR-100704 JOGB-2TR trail position #JOG2 hi-vol 10/07/04 0.00288 0.00288 0.000959
JOGB-H2-12TR-100704 JOGB-2TR duplicate of trail position #JOG2 hi-vol 10/07/04 <0.00291 0.00292 0.000974
JOGB-H2-3TR-100704 JOGB-3TR trail position #JOG3 hi-vol 10/07/04 0.000975 0.000975 0.000975
JOGB-H2-4TR-100704 JOGB-4TR trail position #JOG4 hi-vol 10/07/04 <0.00293 0.00393 0.000982
JOGB-H2-5TR-100704 JOGB-5TR trail position #JOG5 hi-vol 10/07/04 0.000980 0.00490 0.000980
JOGB-L2-1AD-100704 JOGB-1AD adult #1 10/07/04 0.00701 0.0280 0.00100
JOGB-L2-2AD-100704 JOGB-2AD adult #2 10/07/04 0.0159 0.0458 0.000995
JOGB-L2-12AD-100704 JOGB-2AD duplicate of adult #2 10/07/04 0.0110 0.0330 0.00100
JOGB-L2-3AD-100704 JOGB-3AD adult #3 10/07/04 0.0441 0.123 0.00227
JOGB-L2-4AD-100704 JOGB-4AD adult #4 10/07/04 0.00792 0.0158 0.000990
JOGB-L2-5AD-100704 JOGB-5AD adult #5 10/07/04 0.00598 0.0179 0.000997
JOGB-L2-1NA-100704 JOGB-1NA non-active adult 10/07/04 <0.00295 0.00591 0.000985

PCME fibers = fibers longer than 5 microns with a width between 0.25 and 3 microns, and an aspect ratio (length to width) greater than 3:1

AHERA-like total structures = structures longer than 0.5 microns with an aspect ratio greater than 3:1 (Note this differs somewhat from the strict AHERA structure definition)

Sensitivity = the sample-specific lowest concentration of asbestos the laboratory can reliably detect

s/cc = structures per cubic centimeter

Garden and Outdoor Classroom. The START collected samples to test the moisture level of the soil just prior to conducting the scenario at the Garden and Outdoor Classroom (see Table 5-7: Moisture Levels in Activity Area Soils).

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