9300 Lee HighwayFairfax. \irsima22031-1207

703/934-3000

ICFTECHNOLOGY INCORPORATED

MEMORANDUM

DATE:

TO:

FROM:

SUBJECT:

REFERENCE:

April 1. 1994

Jim Konz. EPA Task MonitorToxics Integration Branch

-

^y^̂

The following summarize the results of the Team's investigation, ".a^0

Dioxin Cleanup Levels 0

• Cleanup levels regardless of medium were provided for a total of 23 sites.

• 13 sites provided neither a medium nor a cleanup level.

• 4 sites had cleanup levels for both soil and groundwater.

^ \ , ^ 12 NPI^ (proposed and final) sites had cleanup levels for dioxin (and/or dioxin,-J ~ ^"isomers) in soil.

. ^• ,

1^r.\s

Toxicity Information iy«^—I

Detectable Levels 00

• 17 NPL (final) sites had detectable levels of dioxin (and/or dioxin isomers) in soil.

• 6 NPL (final) sites had detectable levels of dioxin (and/or dioxin isomers) ingroundwater.

• 5 NPL (final) sites had detectable levels of dioxin (and/or dioxin isomers) insediment.

• 2 NPL (final) sites had detectable levels of dioxin (and/or dioxin isomers) insludge.

• 1 NPL (final) site had detectable levels of dioxin (and/or dioxin isomers) in ash.

• 4 NPL (final) sites had detectable levels of dioxin (and/or dioxin isomers) in fish.

• 3 NPL (final) sites had detectable levels of dioxin (and/or dioxin isomers) insurface water.

Toxicity Values

• 9 NPL (final) site risk assessments had 1.50 E+05 as a carcinogenic toxicity value.

• 9 NPL (final) site risk assessments had 1.56 E+05 as a carcinogenic toxicity value.

• 3 NPL (final) site risk assessments had 1.60 E+05 as a carcinogenic toxicity value.

• 1 NPL (final) site risk assessment had 6.20 E+03 as a carcinogenic toxiciiv value.

• 1 NPL (final) site risk assessment had 2.00 E+05 as a carcinogenic toxicity value.

• 1 NPL (final) site risk assessment had 3.80 E+05 as a carcinogenic toxicity value.

• 4 NPL (final) site risk assessments had 1.00 E-09 as a non-carcinogenic toxicityvalue.

Toxicity Equivalency Factors

• 20 NPL (final) site risk assessments had Toxicity Equivalency Factors (TEFs) toestimates risks from dioxin and dioxin isomers.

• 3 NPL (final) site risk assessments cited International TEFs.

• 9 NPL ( f ina l ) site risk assessments cited USEPA TEFs.

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• 5 NPL (final) site risk assessments did not cite the TEF source. ^^

• 2 NPL (final) site risk assessments cited both International and USEPA TEFs. 00

• 1 NPL (final) site risk assessments cited both USEPA and NATO TEFs.

As you directed, we have forwarded copies of this report directly to Mariene Berg and MelissaShapiro. If you have any questions or comments regarding the above information, or if additionalinvestigations are needed, please feel free to contact us-

attachments

cc: Jim McMaster (without attachments)iMarlene Berg, OERRMelissa Shapiro. OERR

Attachment I - Cleanup Levels

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ATTACHMENT 1: CLEANUP LEVELSATTACHMENT 2: TOXICITY INFORMATION

barcode: *81595*barcodetext: 81595