bet365����ios

TABLE OF CONTENTS

OVERVIEW

12.1 What is the purpose of this chapter? This chapter describes the bet365����ios’s (Service) requirements and procedures for:

A. Determining whether radon gas is present in our facilities and drinking water systems, and if so, at what levels, and

B. Implementing mitigation measures when necessary.

12.2 What is the scope of this chapter? This chapter applies to occupiable spaces and non-public subsurface drinking water sources in Service-owned or leased buildings and structures.

12.3 What is the Service’s overall policy on radon management? Our policy is to prevent Service employees and their family members, contractors, volunteers, and visitors from being exposed to unsafe levels of radon gas.

12.4 What are the authorities for this chapter?

A. General Services Administration (GSA) Memorandum, Radon (PBS P 5940.2).

B. Standards for Protection Against Radiation, Appendix B: Derived Air Concentrations of Radionuclides for Occupational Exposure, as amended ().

C. Toxic Substances Control Act, as amended, Indoor Radon Abatement ().

D. 485 Departmental Manual (DM) 2,.

12.5 What terms do you need to know to understand this chapter?

A. Mitigation. Radon mitigation is any system or steps designed to reduce radon gas concentrations in the indoor air of a building or a non-public subsurface drinking water system.

B. Non-public subsurface drinking water system. This is a non-municipal drinking water source that is underground (e.g., a well that pumps water from an aquifer).

C. Picocurie per liter (pCi/L). A pCi/L is a unit of radioactivity corresponding to an average of one decay every 27 seconds in a volume of one liter of air.

D. Radon. Radon is an inert, colorless, odorless, naturally occurring, radioactive gas that is formed by radioactive decay of radium atoms. Radon, which may be found in drinking water and indoor air, can cause lung cancer.

RESPONSIBILITIES

12.6 Who is responsible for the management of radon testing and mitigation? See Table 12-1.

 Table 12-1: Responsibilities for Radon Management

IMPLEMENTATION

12.7 What are the components of radon management? Effective management of radon gas includes testing, evaluation of radon test results, and mitigation where needed to reduce radon to acceptable levels.

A. Radon Testing. Although all occupiable spaces and non-public subsurface drinking water sources in Service-owned or leased buildings and structures require radon testing, residences, bunkhouses, and dormitories are the highest priority for testing.

(1) You do not need to test buildings or structures that are not occupied (e.g., enclosed parking structures, warehouses that do not have offices in them, pole barns, pesticide storage buildings).

(2) You may use either:

     (a) A U.S. Environmental Protection Agency (EPA)-approved contractor or knowledgeable local, state, or Federal health services personnel; or

     (b) A radon “do-it-yourself” testing kit, which generally is low-cost and available online or at home improvement retail stores.

(3) If using a “do-it-yourself” kit, test for radon in the following manner:

     (a) Place the radon-sampling device on the lowest occupiable level of the structure structure
Something temporarily or permanently constructed, built, or placed; and constructed of natural or manufactured parts including, but not limited to, a building, shed, cabin, porch, bridge, walkway, stair steps, sign, landing, platform, dock, rack, fence, telecommunication device, antennae, fish cleaning table, satellite dish/mount, or well head.

Learn more about structure in a location where it will not be disturbed.

     (b) Conduct short-term measurements that last 90 days or less under closed-building conditions, such as during the heating or air conditioning season. Avoid taking measurements in the spring or fall when windows are open.

     (c) Sample Service-owned non-public subsurface water sources at the point of entry into the structure.

(4) Contact your RECC for additional guidance on testing.

B. Evaluating Radon Levels.

(1) Table 12-2 lists the acceptable radon levels for buildings and non-public subsurface water sources, which are based on GSA radon standards and the Nuclear Regulatory Commission’s exposure limits for the workplace.

Table 12-2: Acceptable Radon Levels

(2) Buildings tested prior to the date this policy was signed and that have radon levels less than the thresholds in Table 12-2 require no additional testing.

C. Mitigation. When the acceptable radon levels are exceeded for a building or structure, the Project Leader/Facility Manager must ensure mitigation is performed according to the schedule in Table 12-3.

Table 12-3: Radon Mitigation Schedule

D. Mitigation methods. 

(1) In general, you can reduce radon levels with one or a combination of more than one of the following mitigation techniques:

     (a) Activated carbon,

     (b) Aeration,

     (c) Depressurization,

     (d) Pressurization,

     (e) Sealing,

     (f) Suction, or

     (g) Ventilation.

(2) Contact your or refer to the for additional guidance on mitigation techniques.

E. Post-Mitigation. After installation of a radon mitigation system:

(1) You should measure the radon gas over at least the next 3 months, and preferably during the winter. Secondary, longer-term measurements, usually over 12 months, will provide a more definitive picture of radon reduction.

(2) Radon testing must be conducted after completion of renovation or repair projects for structures, buildings, and water systems with an installed radon mitigation system.