UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
ENVIRONMENTAL CRITERIA AND ASSESSMENT OFFICE
CINCINNATI. OHIO 45268
MEMORANDUM
DATE: 
August 8, 1994
SUBJECT: 
Subchronic Toxicity Information for Benzene (CASRN 71-43-2), Chromium VI
(CASRN 7440-47-3), Di(2-ethylhexyl)phthalate (CASRN 117-81-7) and Vinyl
Chloride (CASRN 75-Ql-4)(Tu Tu Wellfield Site/St. Thomas, Virgin) Islands)
FROM: 
Joan S. Dollarhide1 -
Director
Superfund Health Risk Technical Support Center
Chemical Mixtures Assessment Branch
TO: 
Mark Maddaloni
U.S. EPA
Region II
This memorandum is in response to a request submitted by Jill Naugle, CDM Federal
Programs Corporation, for subchronic toxicity information on benzene, chromium VI, Di(2-
ethylhexyl)phthalate and vinyl chloride to be used for the Tu Tu Wellfield site/St. Thomas,
Virgin Islands.
Attached please find the following information:
•
Attachment 1: 
Risk Assessment Issue Paper for: Derivation of a Provisional
Subchronic Inhalation RfC for Benzene (CASRN 71-43-2) [Joan
Dollarhide, Harlal Choudhury and John Cicmanec ofECAO-Cin
reviewed this assessment.]
Attachment 2: 
Risk Assessment Issue Paper for: Derivation of Subchronic RfC
for Chromium (various CASRN) [Note for the cover memo: Dr.
Harlal Choudhury/ECAO-Cin reviewed this assessment.]
Attachment 3: 
Risk Assessment Issue Paper for: Derivation of a Provisional
Subchronic RfC for Di(2-ethylhexyl)phthalate (CASRN 117-81-
7)[Dr. Susan Velazquez/ECAO-Cin reviewed this assessment
Attachment 4: 
Risk Assessment Issue Paper for: Evaluation of Subchronic
Inhalation Systemic Toxicity for Vinyl Chloride (CASRN 75-01-
4) [Joan Dollarhide/ECAO-Cin reviewed this assessment]
':•'•', Pnnted on Recycled Paper
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64561
Attachment 5: 
Risk Assessment Issue Paper for: Evaluation of Subchronic
Oral Systemic Toxichy for Vinyl Chloride (CASRN 75-01-4)
Please feel free to contact the Superfund Technical Support Center at (513) 569-7300 if
you need further information.
Attachments
cc: 
P. Grevatt (Region IT)
C. Kwan (Region II)
J. Naugle (CDM Federal Programs Corporation)
TUT 
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