CBP Environmental Standards 4

Question 1

What indoor radon level does EPA recommend as the threshold for mitigation?

Accepted Answer

4.0 pCi/L

Answer

EPA recommends fixing homes with radon at or above 4 pCi/L and considering mitigation between 2 and 4 pCi/L.

Question 2

Which feature is part of a passive radon-resistant new construction (RRNC) system?

Accepted Answer

A gas-permeable layer under the slab with a sealed vent pipe running through the roof

Answer

RRNC combines a gas-permeable aggregate layer, a vapor retarder, sealed openings, and a vent stack through the roof that can later take a fan.

Question 3

Which federal agency issues permits under Section 404 of the Clean Water Act to fill jurisdictional wetlands?

Accepted Answer

U.S. Army Corps of Engineers

Answer

The Army Corps of Engineers runs the Section 404 dredge-and-fill permit program, with EPA oversight.

Question 4

A lender requires a Phase I Environmental Site Assessment before land acquisition. Which standard governs it?

Accepted Answer

ASTM E1527

Answer

ASTM E1527 sets the Phase I ESA practice that satisfies EPA's All Appropriate Inquiries for CERCLA liability protection.

Question 5

Before demolishing a building, the asbestos NESHAP requires written notice to the regulating agency at least how many working days in advance?

Accepted Answer

10 working days

Answer

Demolition notification is due 10 working days before work starts, even when no regulated asbestos is found.

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