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  • Guidance For The Evaluation And Mitigation Of Subsurface Vapor Intrusion To Indoor Air Interim

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INTERIM FINAL GUIDANCE FOR THE EVALUATION AND MITIGATION OF SUBSURFACE VAPOR INTRUSION TO INDOOR AIR Department of Toxic Substances Control California Environmental Protection Agency December 15,.

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Attenuation factors (AFs) are estimates of the decimal fraction of vapor phase chemicals that pass through a barrier and enter the indoor space of a structure.

The groundwater attenuation factor is a ratio of the indoor air concentration to the groundwater concentration times its unitless Henry's Law constant (H').

However, DTSC also recommends that screening assessments evaluate the USEPA default attenuation factors of 0.03 for sub-slab soil gas and “near-source” exterior soil gas.

This attenuation factor is a measure of how soil and building properties limit the intrusion of organic vapors into overlying buildings and is defined as the concentration of the compound in indoor air divided by the concentration of the compound in soil gas or groundwater.

The VISL's default attenuation factor for near-source/sub-slab soil gas and groundwater are 0.03 and 0.001, respectively.

The design and installation costs can range from $2.50/ft2 to $6.75/ft2; however, for most buildings, the cost of a combination vapor barrier/venting system is in the $3.00/ft2 to $4.00/ft2 range.

Sealing openings involves filling in cracks in the floor slab and gaps around pipes and utility lines found in basement walls. Concrete can be poured over unfinished dirt floors. Installing vapor barriers involves placing sheets of “geomembrane” or strong plastic beneath a building to prevent vapor entry.

USEPA Recommended Attenuation Factors 0.001 for groundwater to indoor air, 0.03 for sub-slab soil gas to indoor air, and. 1.0 for crawl space air.

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© Copyright 1997-2025
airSlate Legal Forms, Inc.
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Form Packages
Adoption
Bankruptcy
Contractors
Divorce
Home Sales
Employment
Identity Theft
Incorporation
Landlord Tenant
Living Trust
Name Change
Personal Planning
Small Business
Wills & Estates
Packages A-Z
Form Categories
Affidavits
Bankruptcy
Bill of Sale
Corporate - LLC
Divorce
Employment
Identity Theft
Internet Technology
Landlord Tenant
Living Wills
Name Change
Power of Attorney
Real Estate
Small Estates
Wills
All Forms
Forms A-Z
Form Library
Customer Service
Terms of Service
DMCA Policy
About Us
Blog
Affiliates
Contact Us
Privacy Notice
Delete My Account
Site Map
All Forms
Search all Forms
Industries
Forms in Spanish
Localized Forms
Legal Guides
Real Estate Handbook
All Guides
Prepared for You
Notarize
Incorporation services
Our Customers
For Consumers
For Small Business
For Attorneys
Our Sites
US Legal Forms
USLegal
FormsPass
pdfFiller
signNow
airSlate workflows
DocHub
Instapage
Social Media
Call us now toll free:
1-877-389-0141
As seen in:
  • USA Today logo picture
  • CBC News logo picture
  • LA Times logo picture
  • The Washington Post logo picture
  • AP logo picture
  • Forbes logo picture
© Copyright 1997-2025
airSlate Legal Forms, Inc.
3720 Flowood Dr, Flowood, Mississippi 39232