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PUBLIC HEALTH ASSESSMENT

NEWTON COUNTY WELLS (a/k/a SILVER CREEK TCE)
JOPLIN, JASPER COUNTY, MISSOURI


APPENDIX A

Site Map
Figure 1. Site Map


APPENDIX B

Exposure Calculations

Ingestion Exposure Calculations

IDw = C x IR x EF
                 BW

where:
IDw = ingestion exposure dose (mg/Kg/day)
C = contaminant concentration (mg/L)
IR = ingestion rate
EF = exposure factor
BW = body weight
Adult:

IDw = .327 mg/L x 2 L/day x 1

70 Kg

Idw = 0.0093 mg/Kg/day

This calculation assumes that an adult weighs 70 Kg and drinks 2 L of tap water per day.

Child:

IDw = .327 mg/L x 1 L x 1

10 Kg

IDw = .0327 mg/Kg/day

This calculation assumes a child weighs 10 Kg and drinks 1 L of tap water per day.

Inhalation exposure for TCE in drinking water

In order to estimate the inhalation exposure residents of Saginaw and Silver Creek experienced, we need to make some assumptions. These are: a person breathes in approximately 15 cubic meters of air per day; that they live in a 2000 square foot, three bedroom home; that there is 100% TCE volatilization from water; and that water usage in a home is approximately 120 gallons/bedroom.

Equations

The MRL for acute exposure to TCE in air is 2 parts per million. (7)
1 part per million is equal to 5.4 mg/cubic meter
Therefore, the MRL is equal to 10.8 mg/cubic meter

The inhalation exposure for Silver Creek and Saginaw residents is approximately ten times lower than the acute Minimal Risk Level.

Cancer Calculations

Equations


Table of Contents

  
 
USA.gov: The U.S. Government's Official Web PortalDepartment of Health and Human Services
Agency for Toxic Substances and Disease Registry, 4770 Buford Hwy NE, Atlanta, GA 30341
Contact CDC: 800-232-4636 / TTY: 888-232-6348

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