August 31, 2007

ATSDR’s Current Health S

Marine Corps Base Camp Le

Use of Water-Modeling M

Morris L. Maslia

Research Environmental En

Agency for Toxic Substances an

Registry

Presentation for Star-News Forum P

Wilmington, North Carolina

August 31, 2007

The findings and conclusions in this presentation are those of the author and do not necess

Agency for Toxic Substances and Disease Registry
August 31, 2007

Co-authors and co-inves

(listed in alphabetical ord

organization)

F.J. Bove, M.L. Maslia, P.Z. Rucka

Sautner, R.J. Suárez-Soto1

R.E. Faye2M.M. Aral, W. Jang, J. Wang3J.W. Green Jr., A.L. Krueger, C. VaW.M. Grayman5

1Agency for Toxic Substances and Disease Registry2Eastern Research Group, R.E. Faye and Associates, Inc.3Multimedia Environmental Simulations Laboratory, Georgia Institute o4Oak Ridge Institute for Science and Education5W.M. Grayman, Consulting Engineer
August 31, 2007

Acknowledgments

US Marine Corps, EMD and PWD

SA Brewer, B Ashton, SR William

J Hartsoe, DE Hill

US Geological Survey

NC and GA Water Science CenteEnterprise Publishing Network

US EPA

Region IV

Former Marines and Families
August 31, 2007

Environmental path

exposure assessmen

modeling concep
August 31, 2007

Environmental health pro

ExpoAsse

1

2 3

4

Pathway Transport

Epi 
August 31, 2007

Historical reconstruct

Process of Historical Reconstruc

Epidemiologic 

study

Time Present-d

Contamination Exposure Re

inve
August 31, 2007

Why use models to est

exposure scenarios

Time

Concentration

Desired Condition

Measured

Data

Study time frame

Concentration Stu

Typic
August 31, 2007

ATSDR’s current healt

at U.S. Marine Corps 

Camp Lejeune, North C
August 31, 2007

Exposure to volatile organic co

drinking water and specific bi

and childhood cancers (case-co

 Multi-step process

 Review scientific literature to identify spec

and childhood cancers associated with dricontaminated with chlorinated solvents

 Conduct telephone survey to ascertain pot Obtain medical records to verify diagnoses 

cases

 Conduct a case-control study

interview parentsobtain estimates of exposure from the w

component
August 31, 2007

Goals and objectives of water

activities supporting current h

Arrival of contaminants at pu

supply wells

Distribution of contaminants 

housing location

Reliability of and confidence 

modeling results
August 31, 2007

Epidemiological study a

Exposed

1968-1985

Exp

1968

Unexpo

June 19

1985
August 31, 2007

Study and analysis time fra

Tarawa Terrace

1950 1960 1970 1980 

Epidemiological study: 1968-1985

Drinking-water supply at TT: 1952-1987

Historical reconstruction: 1951-1994

Exposure to contaminated drinking water (>MCL): 195
August 31, 2007

Final Results for Ta

Terrace and Vicin
August 31, 2007

Groundwater fate and transpo

January 1958 January 1968

December 1984 December 1994
August 31, 2007

Concentration of finished water del

Tarawa Terrace WTP
August 31, 2007

Summary of simulation re

Water 

supply

Date and 

duration, in 

months, MCL 

exceeded

Maximum PCE 

concentration, 

in μg/L

TT-23 Aug 1984–Apr 1985: 8 months 274 

TT-25 Jul 1984-Feb 1985: 32 months 69 

TT-26 Jan 1957-Jan 1985: 333 months 851 

WTP Nov 1957-Feb 1987: 346 months 183 

*Exceeding MCL for PCE of 5 μg/L
August 31, 2007

PCE in soil gas (depth of 

December 1984

December 1994
August 31, 2007

Summary of Finding

PCE concentration exceede

current MCL of 5 μg/L in fin

water at the Tarawa Terrace 346 months

November 1957-February 198Maximum modeled value:183 Maximum measured value: 2

(Feb 1985)
August 31, 2007

Summary of Findings--con

 PCE degradation by-products TCE an

finished water at the Tarawa Terrace W

Modeled concentrations: 2-15 μg/LMeasured concentration (TCE): 8 μ

1985)

Measured concentration (1,2-tDCE

11, 1985)
August 31, 2007

Summary of Findings--con

Exposure to PCE and PCE degr

product contaminated drinking ceased after February 1987

Potential for exposure from PC

degradation by-product vapor igas) at elementary school and iTerrace I family housing area sithrough December 1994.
August 31, 2007

Tarawa Terrace repor

Executive Summary Summary 
August 31, 2007

Information and results ava

public

 ATSDR Camp Lejeune web site

 http://www.atsdr.cdc.gov/sites/lejeune/watermod

 Web application

 Table listing simulated concentrations 

1,2-tDCE, and VC by month and year

 Graph of simulated concentrations

 PDF files for down load

 Peer Review Panel on Water Modeling  Executive Summary report Table of simulated concentrations vs.  Graph of simulated concentrations vs.  Chapter A – Summary of Findings
August 31, 2007

Thank you for the opportunity 

information on ATSDR’s curr

study and water- modeling r

Marine Corps Base Camp Lej

For questions or additional inform

you can contact:

Morris L. Maslia

mmaslia@cdc.gov