Quality Assurance and Quality Control Plan for the … · Quality Assurance and Quality Control...

Initials:_PG___ Date:___7/28/17___ 1 Copyright ©2014 Air Chek, Inc. Rev: 06/19/14

Quality Assurance and Quality Control Plan for the

Measurement of Indoor Radon Concentrations

With ProChek Activated Charcoal Test Kits

Prepared For:

Paul Gehrke

Inspect Des Moines, LLC

1880 Brodie St

Waukee, IA 50263

(515) 518-0249

CREATED ON:

REVISION DATE: June 19, 2014

APPROVED by:

Managing Member: Paul Gehrke Primary Tester: Paul Gehrke

Signature Signature

Date: Date:

These signatures represent the awareness of, approval of, and responsibility for this plan of all persons who have significant

responsibility for ensuring that the provisions of this plan are implemented. Note that this QA Plan includes procedures for conducting

radon measurements in single-family residences and school buildings, but does not include procedures for testing commercial buildings

or multi-family buildings. This QA Plan does NOT include long-term testing.

naging Member: Pau

Signature ignature Signature

Primary Tester: Pa

Signature


Table of Contents

SECTION PAGE

1 INTRODUCTION AND DISTRIBUTION LIST 3

2 OPERATIONS & EQUIPMENT 4

3 STAFF ORGANIZATION, RESPONSIBILITIES & TRAINING 5

4 MEASUREMENT PROCEDURES 6

5 DETECTOR CUSTODY 12

6 ANALYTICAL PROCEDURES 13

7 CALIBRATION PROCEDURES 13

8 DATA VALIDATION & REPORTING 14

9 INTERNAL QUALITY CONTROL 16

10 QUALITY ASSURANCE AUDITS AND REPORTS TO MANAGEMENT 19

11 CORRECTIVE ACTION 19

12 QUALITY ASSURANCE TRAINING 20

Appendix A: Specifications and Instructions for Test Kits 21

Appendix B: Declaration of Voluntary Compliance 25

Appendix C: School Administrator Notification 28

Appendix D: Assessing Results for Duplicates and Spikes 29

Appendix E: Radon Test in Progress Notifications 33

Appendix F: Test Condition Checklists and Placement Logs 36

Appendix G: Radon Test Reports 40

Appendix H: Residential Summary Report Spreadsheet 47

Appendix I: Internal Audit Checklist 48

Appendix J: Radiological Safety Plan Guidance 50

Appendix K: EPA Protocols and Guidance Documents used by 52



1.0 INTRODUCTION AND DISTRIBUTION LIST

1.1 Introduction

This Quality Assurance (QA) Plan is consistent with the guidance issued by the U.S. Environmental Protection Agency

(EPA National Radon Proficiency Program Guidance on Quality Assurance [EPA-402-R-97-012, September 1997]).

This plan is formatted in a way that allows Inspect Des Moines, LLC staff to reference easily pertinent portions of this

document. The elements recommended by the EPA are all included although some have been combined. The

nomenclature used in this QA Plan is appropriate for the operations of Inspect Des Moines, LLC, and every effort has

been made to maintain consistency with the latest EPA guidance.

1.2 Distribution List

This manual reflects current operations, and therefore is often updated and revised. Paul Gehrke has responsibility for

incorporating changes, and ensuring that the changes are reviewed and approved by the management, as indicated by

their dated signatures on the signature page. After significant revisions, revised copies of this QA Plan are distributed to

the staff listed in Section 3.2. Once each staff has read and understands this QA Plan, they will sign and initial their name

in this distribution list.

Position________________Staff Name ______Signature Initials

QA Officer Paul Gehrke

Testing Staff Paul Gehrke


2.0 OPERATIONS & EQUIPMENT

2.1 Operation Description

Inspect Des Moines, LLC performs measurements of radon concentrations primarily for residences and schools

following EPA Protocols and State Radon Program guidance.

The office is located at:

1880 Brodie St, Waukee, IA 50263

2.2 Description of Equipment Used

ProChek Activated Charcoal Test Kits

Air Chek, Inc. manufactures the ProChek 2-4 day Activated Charcoal Test Kit in Mills River, North Carolina. The

ProChek kits carried the device code ‘AB001’ in the former US EPA Radon Proficiency Program and the current

AARST-NRPP device code is ‘8201’. Air Chek’s AARST-NRPP Laboratory Accreditation number is 101138AL.

Specifications:

Air Chek, Inc. is the patent holder and sole provider of the unitary packet designed activated charcoal adsorber. The

ProChek device is designed for Professional testing where deployment periods of 48 to 96 hours (+/- 2 hours) are

required. The device has incorporated into the sampler a data panel whereby the test sampling and end user data is never

separated from the test sample. Appendix A lists additional Pro Chek device specifications.

The test kit is a tubular diffusion barrier sampler technology that is deployed by inserting the foam filter and then

suspended (hung) from the plastic hook located adjacent to the test kit serial number. The laboratory’s high-geometry

counting design yields over eight times the resolution per gram of charcoal used than any of the canister-type systems.

The packet is a foil-lined, four inch by six inch, heavy paper envelop and is the thinnest charcoal test device available.

Canister-type charcoal devices weigh more than the Pro Chek sampler, making the canister significantly more expensive

to ship and more awkward to handle.

ProChek radon test kits have a one-year shelf-life from the date that the devices are shipped by Air Chek, Inc. Storage

conditions may shorten the shelf-life, so quality control measures found within this QA Plan will be maintained in order

to ensure that the test devices have not been compromised while being stored.


3.0 STAFF ORGANIZATION, RESPONSIBILITIES, & TRAINING

3.1 Organization, Personnel and Responsibilities

Paul Gehrke - Primary Tester

Inspect Des Moines, LLC employees are listed as follows:

Managing Member and QA Officer, Paul Gehrke

3.2 Staff Training

3.2.1 Measurement Training

All Inspect Des Moines, LLC personnel are responsible for reading and understanding this QA Plan, especially the

sections associated with their particular areas of responsibility. EPA protocol guidance, this QA Plan, as well as the

ProChek Test Kit Instructions are the principal source documents for the QA/QC procedures and protocols. Staff

members will be trained on proper testing procedures prior to performing field work or assuming their duty as detailed

within this document and will obtain State or National certifications for the radon services being provided. Inspect Des

Moines, LLC measurement staff will take approved radon measurement training courses, applicable exams, and the

continuing education courses needed to obtain and maintain these radon certifications.

3.2.2 Ethics Training

Inspect Des Moines, LLC will provide ethics training for each employee within two weeks of employment as well as

annually for all employees. The training will highlight ethical and legal responsibilities of each person in the company.

The Quality Assurance Officer or Managing Member will conduct the training. Training will include specific information

on the implications of modifying or manipulating test conditions, test device placement, and falsifying test data including

laboratory data or test reports. It will be made clear that there are legal and employment implications for violating

Inspect Des Moines, LLC ethics policies. Records will be maintained to indicate the date of training and the trained

employee will attest that training did take place on the date indicated in the record.

3.2.3 Certification/Licensure

When working within a licensed state, Inspect Des Moines, LLC staff will maintain all state licenses as required by law.

When performing radon testing services in non-regulated states, Inspect Des Moines, LLC staff will maintain national

radon certifications for services being performed.


4.0 MEASUREMENT PROCEDURES

Paul Gehrke and Inspect Des Moines, LLC follow(s) all current State and EPA radon protocols, manufacturer

instructions and this Quality Assurance Plan for screening, follow-up, and post-mitigation testing in homes and schools.

When performing tests associated with real estate transactions, EPA real estate testing protocols are followed to insure

that all measurements are made in appropriate and consistent locations and environments. The following documents are

utilized by Inspect Des Moines, LLC for all radon testing services:

EPA Protocols

Indoor Radon and Radon Decay Product Measurement Device Protocols [EPA 402-R-92-004]

Protocols for Radon and Radon Decay Product Measurements in Homes [EPA 402-R-93-003]

EPA Guidance Documents

A Citizen’s Guide to Radon [EPA 402-K-07-009]

Home Buyer’s and Seller’s Guide to Radon [EPA 402-K-06-093]

Radon Measurement in Schools [EPA 402-R-92-014]

EPA National Radon Proficiency Program Guidance on Quality Assurance [EPA 402-R-97-012]

Air Chek Documents

ProChek Test Kit Instructions (See Appendix A) – These instructions include the manufacturer’s instructions for use

including deployment considerations and protocols, test conditions and duration, retrieval protocols, instructions for

returning the devices to the laboratory, and data collection requirements. The test kit instructions also clearly indicate

the preferred test duration of 48-96 hours, the requirement that the kits are hung when deployed, that they are sealed

appropriately, and returned promptly to the laboratory for analysis. The instructions also indicate that the test kits must

be used within 12 months from the purchase date of the kits.

4.1 Measurement Definitions

Blank or Field Blank - (5%, up to 25/month) Blanks are quality control measurements made to assess contamination

during storage. Blanks are to be stored in an area with low humidity and low radon. When submitting blanks, the outer

layers of plastic are removed and the test kit sealed immediately. The data panel is completed to look like actual test

samples and submitted for laboratory analysis.

Client - Person, persons, or businesses, government agencies or school that have contracted with Inspect Des Moines,

LLC to perform a radon survey in a dwelling, school, or commercial building. In dwellings, the client is often the buyer

in the midst of a real estate transaction.

Duplicate - (10%, up to 50/month) Duplicates are checks to assess test result consistency (precision). Duplicates are

hung side-by-side, 6-12 inches apart, for identical test periods. See Appendix D for more information about assessing

duplicates.

Laboratory – The remote third-party facility that analyzes devices placed and retrieved by Test Technicians. The Air

Chek laboratory complies with all National and State guidelines for the analysis of ProChek activated charcoal test

devices.

Long-Term Testing - Any radon or radon decay product measurement using approved devices, acknowledged as

appropriate and acceptable within the EPA Protocols sampling for ninety-one days or longer. Long-term testing is not

covered in this QA Plan

Occupant - A person living, occupying, or working in a dwelling who may or may not be the owner of the dwelling and

is responsible for the dwelling.


Quality Assurance (QA) - A system of checks, balances, and controls that are assessed to ensure test result reliability.

Quality control samples are made and then evaluated against a predetermined set of thresholds. The QA Plan describes

how the threshold limits are determined and how QC samples are assessed.

Quality Control (QC) - The actual measurements (blanks, spikes, and duplicates) made to be graded against the quality

assurance goals set by the company. QC samples are the heart of the QA Plan and are initiated on an ongoing monthly

cycle.

Radon Measurement - A radon or radon decay product measurement that provides an averaged concentration over the

exposure period. The detector is to be located as specified in EPA radon measurement protocols and this QA Plan. The

test kit is also deployed in accordance with the recommendations of the detector manufacturer and this QA Plan. The

detector exposure time is within the range specified by Air Chek, Inc. and EPA Protocols.

Responsible Individual - This refers to the person or persons responsible for assuring that the test conditions required

by this QA Plan are being followed during a radon survey. This responsible individual does not necessarily have to be

the owner of the dwelling.

Short-Term Testing - Any radon or radon decay product measurement using approved devices, acknowledged as

appropriate and acceptable within the EPA Protocols sampling for two to ninety days.

Spike - (3%) Measurements of a known radon environment made to assess bias. Spikes are sent to Bowser-Morner, Inc.

of Dayton, OH on a monthly basis and are exposed to a known amount of radon. The samples are then submitted to the

laboratory using the actual date, times, and temperature provided by the radon chamber and submitted to the laboratory

for analysis.

Test Technician - The person responsible for placing and retrieving the radon detector. All test technician will obtain

State or National radon certifications.

4.2 Measurement Types

The EPA defines five types of radon gas measurements: initial (screening), follow-up, real estate, school, and post-

mitigation.

An initial or screening measurement is of relatively short-term duration (usually 2 to 7 days) to detect a radon problem

in a home. Short-term tests must be carried out under closed-house conditions and in the lowest lived-in area of a house.

If the result of the initial measurement done under closed house conditions is below 4 pCi/L, a follow-up test in a cooler

season may be prudent in case radon levels increase during colder parts of the year.

A follow-up measurement is a measurement made to verify and characterize a radon problem as indicated by a previously

made short-term radon measurement at or above 4 pCi/L. In general, the higher the initial measurement, the sooner the

follow-up measurement should be made and the shorter the exposure length to minimize additional health risk to the

occupants. If the initial test result was between 4 and 8 pCi/L, a long-term measurement lasting up to a full 12 months is

recommended. If the initial measurement was greater that 8 pCi/L, a short-term measurement is recommended.

A real estate measurement is defined as a test being done as part of a real estate transaction, These tests are typically

short-term (2-4 days) made under closed-house conditions, performed in the lowest level of the home potentially used by

a buyer, with close attention being paid to house conditions in an attempt to identify possible tampering signals.

A school testing project involves thoroughly testing all appropriate locations within a school building at the same time.

The school tests will be done during the colder months (October – March) and during a normal school week. (HVAC will

be set to normal occupied settings.)

A post-mitigation measurement is a short-term measurement made to determine whether a mitigation installation is

successful. These tests are done in the same place as the pre-mitigation testing, which should be the lowest lived-in area

of the dwelling or the lowest level suitable for occupancy if the dwelling is involved in a real estate transaction. The test

should not be started sooner than 24 hours after the installation of the radon system. The test must have 12 hours of

closed house conditions before the start of the test and closed house conditions during the (48) hour test. In a school or


commercial buildings, the post-mitigation tests are placed in the rooms that had initial and follow-up test averages of 4.0

pCi/L or higher.

4.3 Guidelines, State Regulations and EPA Protocols

State regulations, when applicable, and EPA protocols will be followed for measurements performed by Inspect Des

Moines, LLC. All applicable existing laws, including but not limited to statutes, ordinances and regulations, are

complied with by Paul Gehrke, and other test technicians in all locations in which the survey is being conducted.

Inspect Des Moines, LLC does not offer or perform any act or service contrary to law.

4.4 Measurement Location

Radon measurement placement locations are chosen according to the type of testing being performed. Residential testing

is done in accordance with the EPA Indoor Radon and Radon Decay Product Measurement Device Protocols (Device

Protocol) (402-R-92-004) and the EPA Protocols for Radon and Radon Decay Product Measurements in Homes (Homes

Protocol) (402-R-93-003), while school testing is done in accordance with the EPA Device Protocol (402-R-92-004) and

the EPA Radon Measurement in Schools (402-R-92-014.)

4.4.1 Residential Testing

4.4.1.1 Initial/Screening Measurements – (non real estate-related)

Initial radon measurements are made in the lowest level of the home that is currently used by the occupant.

� Split-level houses or other designs, which include multiple foundation areas (type), are recommended to have test

locations selected above each foundation area.

� Locations must be selected where the detector is not to be disturbed during the measurement period.

� The detector must not be placed near drafts caused by HVAC vents, windows, and doors. Avoid locations near

excessive heat, such as fireplaces or in direct sunlight.

� The detector should be suspended hanging the test kit(s) from the hook on the kit within the breathing zone (20

inches to 6 feet from the floor.) The test kit opening will not be obstructed with an object within 4 inches of the

kit.

� The detector must not be placed within 12 inches of an exterior wall or within 3 feet of any opening to the

outside such as windows, vents, or exterior doors.

� Test devices may be suspended from interior, non-masonry walls in a manner to ensure that the test kit opening is

not obstructed.

� Rooms with increased humidity levels, such as: kitchens, bathrooms, laundry rooms, root cellars, garages, crawl

spaces, or sumps, are not suitable measurement locations.

4.4.1.2 Real Estate Measurements � EPA recommends that testing device(s) be placed in the lowest level of the home that could be used regularly,

whether it is finished or unfinished. Conduct the test in any space that could be used by the buyer as a bedroom,

play area, family room, den, exercise room, or workshop. Based on their client's intended use of the space, the

qualified testing professional should identify the appropriate test location and inform their client (buyer). Do not

test in a closet, stairway, hallway, crawl space or in an enclosed area of high humidity or high air velocity. An

enclosed area may include a kitchen, bathroom, laundry room or furnace room.

� Split-level houses or other designs, which include multiple foundation areas (type), are recommended to have test

locations selected above each foundation area.






kit.




� Test devices may be suspended from interior, non-masonry walls in a manner to ensure that the test kit opening is

not obstructed.

� Rooms with increased humidity levels, such as: kitchens, bathrooms, laundry rooms, root cellars, garages, crawl

spaces, or sumps, are not suitable measurement locations.

School Testing

� School radon measurements are made in all occupiable rooms with ground contact. This means rooms built above

the crawl space, utility tunnels, the foundation slab, within the basement or where at least one wall has direct

ground contact.

� Appropriate rooms will include classrooms, offices, lounges, gymnasiums, auditoriums, lunchrooms, shop areas,

and some mechanical rooms depending on HVAC designs.

� Inappropriate rooms include kitchens, bathrooms, cafeteria cooking areas, and possibly locker rooms depending

on shower use during testing periods.


� In large, open areas such as gymnasiums and auditoriums, test devices are placed within the area at a rate of 1 kit

per every 2000 ft2. When open areas make it difficult to hang the test kits, items such as music stands will be used

to hang test kits at least 20 inches from the floor.





kit.



� Test devices may be suspended from interior, non-masonry walls (i.e., thumb-tacked to a bulletin board)in a

manner to ensure that the test kit opening is not obstructed.

4.5 Number of Measurements

In order to comprehensively determine a building’s potential to have elevated radon levels, best industry practices are

utilized which includes a minimum of two radon measurements (ProChek charcoal test kits) in the lowest structural area

suitable for occupancy. In a multi-level home with multiple foundation types, Inspect Des Moines, LLC testers will

recommend a test in the lowest area of the building (basement) and in a room above the second foundation area. For

example the test areas could be a finished basement, and/or a slab on grade room, and/or a room over a crawl space. The

measurement placement conforms to the current EPA measurement protocols for radon measurements.

4.6 Measurement Exposure Time

The measurement exposure time is a minimum of 48 hours. Short-term measurement exposure time should be in

increments of 24 hours plus or minus 1 hour for each day of exposure in order to minimize the effect of diurnal

variations. The ProChek test kits are recommended for use between 48 and 96 hours (2 to 4 days). Inspect Des Moines,

LLC testers realize that deployment periods outside of the 48 to 96 hour recommendation from the manufacturer may

invalidate the tests, thus all efforts will be made to adhere to the manufacturer’s instructions.

4.7 Detector Non-Interference

Test Technicians should not initiate a measurement if the occupant is moving or is planning remodeling, changes in the

heating, ventilating and air conditioning (HVAC) system, or other modifications that may influence the radon

concentration during the measurement period. The testing device should not be deployed if the occupant’s schedule

precludes termination of the measurement at the appropriate time.


The testing devices are not to be moved, covered or have its performance altered during the radon survey by anyone.

Examples of performance alteration would be covering the detector, moving it to another location during the test period,

or opening windows during a short-term test.

The responsible individual is requested to sign a non-interference agreement that indicates knowledge of the testing

conditions of this QA Plan and a willingness to cooperate in maintaining the required test conditions.

When testing schools, it is strongly advised that the students and teachers are briefed on the radon testing project, be

shown examples of the radon test devices, the importance of the testing, and the implications of detector interference and

altering building conditions.

If such an agreement cannot or will not be signed by the responsible individual, Inspect Des Moines, LLC indicates on

the field log why the signature was not obtained. Appendix B shows an example of a residential Non-Interference

Agreement as Exhibit B-1 and a school testing Non-Interference Agreement as Exhibit B-2.

4.8 Closed-house/Closed-building Conditions

The weather and building ventilation conditions prior to and during the measurement are in accordance with the

guidelines set forth by the EPA (Device Protocols [EPA 402-R-92-004], Section 1.2.2, page 1-2). These guidelines are

paraphrased in the instructions to clients.

Closed-house/closed-building conditions require that all the windows are kept closed. External and any basement to first

floor doors are closed except for normal momentary entering and exiting. Structural openings due to disrepair or

structural defects that allow a significant amount of ventilation are repaired to correct their condition before initiation of

closed-house/closed-building conditions. The test technician at the placement and retrieval of the detector inspects all

exterior windows and doors. The test technician inspects the outside of the test location to inspect for closed-

house/closed building condition.

Heating, air conditioning, and the recovery ventilators shall be operated normally. Operation of dryers, range hoods, and

bathroom fans should be kept to a minimum. Inspect Des Moines, LLC testers will inform the responsible individual

that overuse of an appliance that exhausts air may influence the final readings.

Whole house/building fans are not operated. Portable window fans are removed from the window or sealed in place.

Window air conditioning units are only operated in a re-circulating mode. If the dwelling or school contains an air

handling system, the air handling system is not set for continuous operation unless the air handling equipment is

specifically used for radon control and labeled as such.

Fireplaces or combustion appliances are not to be operated unless they are the primary sources of heat for the

dwelling/school. Ceiling fans, portable dehumidifiers, portable air filters and window air conditioners are not operated

within twenty feet of the detector. Closed-house/closed-building conditions are maintained for twelve hours prior to the

start of the radon survey, if the test period is four days or fewer in duration and recommended for tests up to seven days

long. Inspect Des Moines, LLC testers inquire with the responsible individual to determine if closed-house/closed-

building conditions have been maintained for the twelve hours prior to the start of the test.

The test technician takes due and proper care in obtaining closed-house/closed building conditions during short-term

testing in order to increase measurement reproducibility. If at the initiation of the test, the technician discovers or

visually observes that closed-house/closed-building conditions were not maintained, then the radon survey is not initiated

until twelve hours of prior closed-house/closed-building conditions have been maintained or the windows and doors are

closed and the test devices are deployed for four full days after closed-house/closed-building conditions are initiated.

4.9 Informing Client about Test Conditions

Inspect Des Moines, LLC testers make reasonable efforts to determine who the responsible individual for the building is

during the test period. Before any radon measurements are begun, the responsible individual is informed or an attempt is

made to inform them about the requirements of and the need for closed-house/closed building conditions as well as other

conditions for which they are responsible. A copy of the EPA document, “Home Buyers and Sellers Guide to Radon”,

“The Citizens Guide to Radon” or “Radon Measurement in Schools”, as appropriate, should be given to each client.


In order to inform occupants of the dwelling about the test and the conditions of the test, a “Radon Survey in Progress”

notification form with the conditions of the test stated on the notification, is posted upon initiation of a short-term test in

a conspicuous location of the dwelling. Appendix E shows examples of a Radon Survey in Progress notification door

hangers and signs used by Inspect Des Moines, LLC.

Testing programs done in school buildings require Inspect Des Moines, LLC to supply radon information to the school

administrators, who can pass along the information to teachers and staff prior to the start of the radon testing. The

guidance will include radon basics, will stress the importance of the testing project, and explanation to stress the need for

maintain closed-building conditions, as well as other sources of radon information. Paul Gehrke will also recommend

that the school administrators send radon information home with students to stress the need for home testing as well.

Appendix C shows a memo that is provided to school administrators.

4.10 Safety

The test technician should not enter any area or perform any test that would damage property or risk the test technician’s

own or another’s safety. If it is known that closed building conditions are detrimental to the health of the occupants, then

the radon survey using a short-term test should not be done.

4.11 Minimum Test Condition Verification

Inspect Des Moines, LLC minimum requirements for verifying test conditions is fulfilled by the following: informing

the responsible individual of the test conditions, obtaining or attempting to obtain a signed non-interference agreement,

conducting a visual inspection of the building upon placement and retrieval of the test devices, and posting a Radon Test

in Progress notification form. This QA Plan does not require the test technician to be responsible for inspecting for

closed-house/closed building conditions 12 hours before the start of the test or between placement and retrieval of the

detector. See Appendix F for examples of the Test Condition Checklists.

4.12 New Construction Test Conditions

Newly constructed dwellings are tested in accordance with this QA Plan. The following items, if such items are part of

the completed building, are installed and completed before the radon survey is initiated: all insulation, all exterior doors,

all windows, all fireplaces and fireplace dampers, all heating/air conditioning appliances, all ceiling coverings, all interior

trim and coverings for the exterior walls, all exterior siding, weatherproofing and caulking. If Inspect Des Moines, LLC

testers know construction work, which will likely affect the test results, is to be done inside the dwelling during the test

period, then Inspect Des Moines, LLC testers schedule the test during a time when such interference is less likely to take

place. Heating and air systems should be operating normally (as if occupied) during the radon testing activities to allow

for closed-house/closed-building conditions.


5.0 DETECTOR CUSTODY

5.1 Detector Receipt and Storage

Each shipment of test kits is inspected for damage upon arrival. Next, the boxes are taken to the mail floor office closet,

which is a dry location with low radon levels to prevent moisture gain or radon contamination during the one-year shelf

life. (Note, Air Chek honors a 1-year shelf-life when quality assurance programs are being monitored, but

recommends that test kits are used within 6 months of purchase.) The kits are kept in the original boxes until used.

Paul Gehrke and all Inspect Des Moines, LLC testers understand that the radon testing, just like other environmental

samples, need to be made carefully and the sampling devices must be handled with care. Thus, test kits will be stored in

the mail floor office closet that will not compromise the quality of the radon sampling.

5.2 Chain-of-Custody

Chain of custody for each ProChek test kit includes documenting the exposure location, times and dates in/out, and

persons responsible for the detectors prior to, during and after their exposure. Paul Gehrke is responsible for ensuring

that this information is properly recorded for each measurement.

The Chain-of-Custody for Inspect Des Moines, LLC begins when test devices arrive from Air Chek, Inc. Paul Gehrke

will develop the appropriate forms that will be used to ensure that the chain-of-custody logs are recorded and updated

each time an order is received. The test kit received log form will include the order date, quantity ordered, date order was

received, delivery method, number of kits received, serial number range received, condition of the external packaging,

condition of test kits, contents inspected by, storage location, and date the last kit was used. The log will also include

information necessary to track the test kits used and will include the name of the tester placing the test devices, the

address or job number of the testing project, the courier used for delivering the samples to the laboratory, and the date of

the shipment.

It is important that the appropriate testing logs are completed for every measurement project. Inspect Des Moines, LLC

testers will use the radon testing logs found in Appendix F to collect the necessary data required to understand the test

conditions and devices placements that will be used to interpret the results of the testing project. Residential radon testing

projects will use the form included as Exhibit F-1, while school testing projects will use the forms included as Exhibits

F-2 and F-3 for each building tested.

The information logged will include, at a minimum:

• Address of measurement client and building measured.

• The start and stop dates and times of each measurement.

• The detector type and serial numbers.

• Whether the occupant has agreed in writing to abide by the closed house conditions (if applicable) throughout the test

period and twelve hours before the test.

• Exact locations of each test device.

• Other easily gathered information that may be useful, such as the type of house, type of heating system, condition of

crawl space vents.

• Weather conditions

Prior to returning the ProCheks for analysis, a visual inspection of each kit should be done to note any damage.

5.3 Returning Test Samples to the Lab

Radon samples collected with activated charcoal device are time sensitive. The most accurate laboratory analysis is done

within one radioactive half-life (3.8 days) from the end of the test. The completed radon samples will be placed within a

single container (envelope or box) unless a large-scale testing project requires too many kits for a single container. In

that event, multiple boxes may be used. Once the test devices have been placed in the shipping container, they will be

shipped in a manner to guarantee arrival at the laboratory within 4 days from the end of test, although overnight or 2-day

service will yield optimal laboratory accuracy.


6.0 ANALYTICAL PROCEDURES (performed by Air Chek)

ProChek 2-4 day Activated Charcoal Test Kit

The sampling and analytical procedures for the ProChek test kits are consistent with the US EPA Indoor Radon and

Radon Decay Product Measurement Device Protocols, EPA 402-R- 92-004, Section 2.4 (Activated Charcoal Adsorption

Devices) and the Quality Manual developed by Air Chek, Inc. Air Chek uses high-geometry well-type sodium iodide

(NaI) detectors designed for gamma ray spectroscopy. The well detectors provide over eight times the resolution per

gram of charcoal used than flat-top NaI detectors used for canister-type systems.

7.0 CALIBRATION PROCEDURES (performed by Air Chek)

ProChek 2-4 day Activated Charcoal Test Kit

The calibration procedures for the ProChek test kits are consistent with the US EPA Indoor Radon and Radon Decay

Product Measurement Device Protocols, EPA 402-R- 92-004, Section 2.4 (Activated Charcoal Adsorption Devices).

Specifically, the calibrations exposures are completed at the Bowser-Morner radon chamber facility in Dayton, Ohio.

These exposures are performed at a series of radon levels, humidity levels, temperatures and exposure lengths. Once the

initial calibration curve has been defined for each exposure variable, monthly spiking services provided by Bowser-

Morner facility are used to verify that no major changes are needed and gentle tweaks are made as necessary.


8.0 DATA VALIDATION AND REPORTING

Paul Gehrke is responsible for validation of testing results and the recording of data. Paul Gehrke has the official sign-

off on the radon test reports.

8.1 Data Validation

The data validation is performed by a complete and thorough review of the laboratory analysis reports transmitted from

Air Chek, Inc. This inspection should include a verification that all exposure data (dates, times, and temperatures) used

to determine the final radon concentration is correct. Any discrepancy should be brought to the attention of Air Chek,

Inc.

The validation process also includes the determination, plotting and charting of precision error associated with duplicate

detectors. This is done by calculating the Relative Percent Difference (RPD) by using the following formula:

RPD = [x1-x2]/[(x1+x2)/2] x 100%

where: x1 is the result of device 1 and x2 is the result of device 2.

Section 9.3 goes into greater detail on the procedures for assessing measurement precision.

8.2 Maintaining Records

Radon measurements are a radiation exposure measurement. Because the effects of radiation exposure may not become

apparent until many years have passed, measurement data should be maintained permanently. Inspect Des Moines, LLC

original test results are logged and kept on file for an unlimited period of time in order to comply with any and all record

keeping guidelines established by any and all governing bodies for good business practices. Paul Gehrke is responsible

for ensuring that all records are filed for each of their tests. These items include, but are not limited to the field

logs, the final report, as well as any others items that could be needed by the client, a mitigator, or the State in the

event that the testing was done properly and to understand the conditions that were noted during the tests.

8.3 Residential Test Reports

Final results are reported in units of pCi/L, in the format provided by Inspect Des Moines, LLC. See the sample report

in Appendix G, provided as Exhibit G-1. The information furnished to clients in the test report follows the

recommendations made by EPA Homes Protocols [402-R-93-003] and Air Chek, Inc.. Values are reported to the tenth

(0.1) of a pCi. Paul Gehrke is responsible for checking the accuracy and completeness of the test reports before they are

sent to the client.

The Test Report is in writing and either mailed first class, e-mailed, faxed or hand delivered to the client within five

business days after Inspect Des Moines, LLC obtains the results.

The Report generated by Air Chek contains the following:

� Address of measurement client and building measured.

� The start and stop, dates and times of each measurement.

� The detector type and serial numbers.

� Location of the detector.

� Test Technicians State and/or National certification/license numbers

� Any required statement by the State, EPA, or this QA Plan.

� Any observed deviations from required test conditions.

� The URL for the Consumer’s Guide to Radon Reduction


The test report includes an interpretation of the measurement results that is consistent with the EPA’s A Citizens Guide to

Radon, Home Buyers and Sellers Guide to Radon, or Radon Measurement in Schools as appropriate.

The Report will describe the general limitations of the test such as the following statement:

“There can be uncertainty with any radon measurement due to statistical variations and other factors such as daily

and seasonal variations in radon concentrations due to changes in the weather and operation of the dwelling as

well as possible interference with the necessary test conditions that may or may not influence the results.”

All test results include a statement, which recommends that the dwelling be re-tested in each of the following cases

whether or not the dwelling has been mitigated:

� Occupancy by a new owner

� Two years since the previous test

� A new addition is added

� An alteration is made that could change the ventilation pattern

� Major cracks or penetrations occur in the foundation walls or slab

� Significant nearby construction blasting or earthquakes occur

� Changes are made or happen to an installed mitigation system

� Occupation of a ground contact area that was not previously tested

8.4 School and Large Building Test Reports

Radon testing projects in schools and other large buildings require special guidance to the clients which detail the overall

findings and a recommended follow-up strategy. These Project Reports will summarize the laboratory reports by

identifying areas of the building with high radon and specifying the recommendations for follow-up measurements and/or

mitigation. Recommendations will comply with State and EPA radon measurement protocols. Laboratory reports for the

project are attached to the final project report to show the data used in making the follow-up or mitigation

recommendations. Paul Gehrke is responsible for checking the accuracy and completeness of the Project Report before

they are sent to the client.

The Project Report is signed by Paul Gehrke. The Project Report is either mailed, e-mailed, faxed or hand delivered to

the client within fifteen business days after Inspect Des Moines, LLC completes the testing for each project. In addition

to the Laboratory Report from Air Chek, Inc., the Project Report will include several sections that will help to describe

things that influence the test results such as weather, closed-building conditions, tampering, Quality Assurance

measurements, and more. A template for Inspect Des Moines, LLC school project reports can be found in Appendix G

as Exhibit G-2.


9.0 INTERNAL QUALITY CONTROL

This section describes specific procedures for four types of internal quality control (QC) checks, measurements and

procedures, which are: Routine device inspections, Measurements of blank detectors (Blanks), Measurements made to

assess precision (Duplicates), and Measurements made to assess relative bias (Spikes). All QC Samples requiring

laboratory analysis will be shipped to Air Chek’s laboratory in a manner consistent with Section 5.2 and will allow them

to arrive within 4 days from the end of the test.

9.1 Routine Checks and Preventative Maintenance

The QA Officer and tester, Paul Gehrke will ultimately be responsible for checking the packaging and storage

conditions for all activated charcoal test devices at the time of arrival and periodically during storage. Ultimately, proper

handling and storage of the test devices are a collaborative effort of each staff person in the office. Section 12 describes

our commitment to quality.

Air Chek recommends that activated charcoal test kits are not to be stored for extended periods of time. The most

accurate test results are obtained with fresh inventory. Ideally, test kits are used within 3 months of purchase, although

longer storage is possible with proper quality assurance documentation. In order to ensure that older kits are not being

used, Inspect Des Moines, LLC will rotate the test kits so that the oldest kits in inventory are used first.

Inspect Des Moines, LLC recognizes that dry charcoal allows for faster and more consistent equilibrium and integration

with the test location, therefore, it is vital that kits are kept in a dry location. Checking the moisture content of the

charcoal can verify the freshness of test devices that must be stored for several months. This check is made through the

processing of blanks. (See Section 9.2)

Paul Gehrke will be responsible for preventing long-term storage of the activated charcoal devices and will ensure that

quality control measures are monitored to verify proper storage. This includes using the oldest kits first. All kits will be

used within 1 year of purchase.

9.2 Procedures for Submitting and Assessing Blanks

Blanks are defined as measurements made to analyze unexposed detectors as a check for contamination. Blanks are

devices that are taken from the normal test device inventory and are opened then immediately resealed. This prevents

room air from entering the charcoal inside the test kit, which means that the test kit should still be dry and free of radon.

The data form is completed in a way to make the test kit appear like a normal sample and then sent to Air Chek for

laboratory analysis.

Blanks will be performed upon receipt of a new shipment of devices and at least monthly while supplies from each

shipment last. The purpose of blank measurements is to assess moisture levels and/or radon gas that may have entered the

test kits during storage. Blanks will be performed at a rate 5 percent (1 for every 20 measurements) of the devices

deployed every month, up to a maximum of 25 per month. I, Paul Gehrke, will make sure that the proper number of

blanks are being performed, charted, and assessed on an ongoing basis.

Paul Gehrke is responsible for recording, monitoring, and charting the results of blank measurements. The warning level

for blanks is set at 5% for moisture content (MST%) and greater than 0.5 pCi/L for radon. If any warning signs indicate

possible contamination of either humidity or radon, Paul Gehrke will contact Air Chek immediately.

Paul Gehrke will make sure that the results of all blanks are provided to Air Chek at least quarterly using the QA/QC

tracking and assessment features on Air Chek’s http://radon-pro.com website.


9.3 Duplicate Measurements Made to Assess Precision

The precision (reproducibility) of the measurement being made is evaluated on an ongoing basis through the use of

duplicate measurements. Duplicates are defined as measurements made side-by-side with the same type of instrument

over identical time periods. Selecting any pair of the charcoal kits of similar age (i.e., from the same shipment or box), at

random and exposing them within 6 to 12 inches of each other constitutes proper duplicate measurements. Duplicates are

performed at a rate of 10 percent of the total number of measurements or up to 50 each month. Paul Gehrke will make

sure that the proper number of duplicates are being performed and assessed on an ongoing basis.

The results of duplicates are analyzed following the procedures described in Appendix D and plotted on a control chart

as shown in Exhibit D-3 and Exhibit D-4. Paul Gehrke is responsible for completing control charts and assessing the

results of the duplicates with consultation with Air Chek in order to fully understand the acceptable window for

acceptable precision (RPD). Paul Gehrke will report warnings beyond the acceptable RPD values to Air Chek

immediately.

Paul Gehrke will make sure that the results of all duplicates are provided to Air Chek at least quarterly using the QA/QC


9.4 Measurements Made to Assess Relative Bias – (Spikes)

Spiked measurements consist of detectors that have been exposed to known radon concentrations in a calibration

chamber. ProChek test kits are spiked at a rate of three per 100 (or 3%). Inspect Des Moines, LLC schedules spike

exposure of devices in the Bowser-Morner radon chamber on a routine basis. Paul Gehrke will make sure that the proper

numbers of spikes are being performed and assessed on an ongoing basis.

(Note from Air Chek: Air Chek, Inc. only recognizes spikes exposed in the Bowser-Morner radon chamber.

Bowser-Morner is used to develop the calibration curves used by the Air Chek laboratory and does not have a

conflict-of-interest with our laboratory. It is very important to schedule spikes immediately upon receipt of a large

device shipment (i.e., 50 kits or more) as well as at multiple points during the year. This assures that test devices

are accurate and provides proof of their continued accuracy during storage. A minimum of 20 spikes is needed to

adequately assess relative bias. This means that several sets of spikes will need to be submitted before bias can be

fully determined for a particular ProChek user. Therefore, the 20 spikes should be done within a reasonable

amount of time, and done regularly though normal test kit use.)

The results of spikes are analyzed following the procedures described in Appendix D and recorded on a control chart as

shown in Exhibit D-5. Paul Gehrke is responsible for ensuring that the detectors being spiked are from inventory

currently in use or a shipment of new devices. The spiked detectors are labeled and submitted blindly to the laboratory in

the same manner as ordinary measurements to preclude special processing, and thereby serve as an internal check on the

entire measurement system. Paul Gehrke will report warnings beyond the acceptable IRE values to Air Chek

immediately.

Paul Gehrke will make sure that the results of all spikes are provided to Air Chek at least quarterly using the QA/QC



9.5 Discussions and Details of QA/QC

Inspect Des Moines, LLC has been given access to several QA/QC features on the http://radon-pro.com website that is

maintained by Air Chek, Inc. The website allows for users to log-in using the Air Chek Customer ID

(CID) and password so that quality control data can be added into a central QA/QC database and assessed

according to Air Chek’s quality control objectives as well as the control program described in this QA

Plan.

The website allows Inspect Des Moines, LLC to input quality control data after laboratory analysis. The website has

separate data input forms for blanks, spikes, and duplicates. Once the data has been entered and saved, Air

Chek’s computerized data management programs perform assessments and send summary reported to the

Air Chek Quality Assurance team. The Air Chek staff review the reports and will contact Inspect Des

Moines, LLC if there are any questions or quality control concerns. Once the questions or concerns have

been discussed, Air Chek will approve the addition to the QA/QC database. At this point, Inspect Des

Moines, LLC will be able to view and/or print the QA/QC data and quality control charts. At least

quarterly, Inspect Des Moines, LLC will print the QA/QC charts, will conduct a review and will keep

them in a master file in our office.


10.0 QUALITY ASSURANCE AUDITS AND REPORTS TO MANAGEMENT

Paul Gehrke will conduct audits of QA operations at least once every six months. Specific focus of the audit is on:

a) Record keeping, (Job logs, field docs, chain of custody, test reports, routine instrument checks)

b) An adequate number and type of QC measurements

c) Maintenance and revisions of SOP

d) Adequate training and retraining of staff

Paul Gehrke creates a written audit report within 30 days following the audit. The audit report includes an assessment of

bias and precision, and includes recommendations as appropriate.

11.0 CORRECTIVE ACTION

Failure of quality control measurements to be within the defined limits of this QA Plan results in immediate action to

identify, correct and document the problem. The QA Officer is responsible for ensuring timely solutions to identified

problems. Once the problems have been identified, the QA Officer is to develop a plan to prevent future occurrence of the

problem. The corrective action plan will be reviewed and signed off by the Managing Member and reviewed and signed

off by all currently licensed staff. Management will explain any changes, why the changes were necessary, and how their

duties will be impacted. Each staff will sign off that they understand the new procedures and their signatures will be kept

on file.


12.0 QUALITY ASSURANCE TRAINING

Paul Gehrke has responsibility for reviewing the training plans for new staff and the plans for retraining when procedures

change. Adequate training is given high priority, since the implementation of this QA Plan is dependent upon the staff’s

understanding of its requirements. Upon completion of the training, the Managing Member, QA Officer and each staff

member signs off that they understand the Quality Assurance objectives, procedures, and their obligation to the Quality

Assurance process. The signatures are kept on file for a minimum of 5 years.

12.1 Commitment to Quality

Paul Gehrke will work with all Inspect Des Moines, LLC staff on an ongoing basis to assure an overall commitment to

quality. We will reiterate to all staff that Quality Assurance goals can only be achieved with a

commitment from all Inspect Des Moines, LLC staff. Each person involved in radon measurement

services has an equal role in our commitment to quality, including receipt and storage of new test kits,

rotating inventory to assure that all kits are used in a timely manner, that all data collection forms are used

and understood by each staff member, that chain-of-custody records must not be broken, that test devices

will be expressed to the laboratory to assure analysis within 4 days from the end of the test, and that all

reports will be distributed to the clients clearly and in a timely manner.

12.2 Personnel Training

All Inspect Des Moines, LLC employees and Paul Gehrke are responsible for this QA Plan and all the

areas herein that apply to their areas of responsibility.

All Inspect Des Moines, LLC personnel are responsible for understanding everything in this QA Plan, which falls within

their particular area of responsibility as defined under Section 3.1 of this plan and/or their particular company Job

Description. This QA Plan is the principal source document for the QA procedures and protocols, which must be known

and practiced by responsible company personnel.

The QA Officer, Paul Gehrke provides each employee with a copy of this QA Plan in which the specific QA/QC

activities and responsibilities for that particular employee are clearly marked and indexed. At the end of the first month

of employment and at least annually thereafter, Paul Gehrke checks each involved employee’s knowledge and

understanding of their quality assurance duties and responsibilities as defined in this Plan. If, in the judgment of the QA

Officer, an employee does not adequately understand his/her responsibilities, follow-up instructions and checks are

carried out until adequate understanding is demonstrated. Paul Gehrke notifies the employee’s supervisor in writing of

each QC result and these results are given prominent consideration in compensation and job advancement reviews.


APPENDIX A

SPECIFICATIONS AND INSTRUCTIONS


EXHIBIT A-1

Pro Chek Test Kit Specifications

ELEMENT COLLECTED Radon (Rn) 222

ACTIVE INGREDIENT Activated Carbon

SAMPLING MODE Passive Diffusion

LABORATORY DETECTION Gamma Ray Spectroscopy

DETECTOR MATERIAL Sodium Iodide (NaI)

ISOTOPES DETECTED Lead (Pb) 214

Bismuth (Bi) 214

LOWER LIMIT OF DETECTION (LLD) 0.3 pCi/L

DYNAMIC RANGE 0.5 To 6553 pCi/l

UNIT OF MEASURE pCi/l

SIZE:

HEIGHT 5.94"

WIDTH 4.25"

THICKNESS 0.375"

WEIGHT 23.0 +/- 0.5 g

ENVIRONMENTAL OPERATING RANGE 35 To 85 ºF

(2 Day Test)10 To 90% RH

(4 Day Test)10 To 75% RH


EXHIBIT A-2 ProChek Instructions Page 1


ProChek Instructions Page 2


APPENDIX B

DECLARATION OF VOLUNTARY COMPLIANCE


EXHIBIT B-1


1880 Brodie Street

Waukee, IA 50263

(515) 518-0249

Residential Testing Program

RADON INSPECTION DECLARATION OF VOLUNTARY COMPLIANCE

As the responsible party for the residence listed below, I hereby acknowledge receipt of the EPA’s “Home Buyer’s and Seller’s Guide

to Radon”. I further understand that potential purchasers and/or lenders will be making important decisions pending the outcome of

this test. Given this information I hereby certify that:

(1) I agree to keep this house closed (except for normal entry and exit) for at least 12 hours prior to the start of the test.

(2) I agree to keep all doors and windows shut during the entire test period except for normal entry and exit.

(3) I will not knowingly alter the test environment in any way including, but not limited to, raising or lowering the thermostat(s)

or changing HVAC fan controls, or moving the test device(s).

(4) I will not touch, tamper with, remove, cover, or change the location of the test device(s).

(5) I will report any circumstances that occur during the test that may influence the final results such as unusual or severe

weather, power outages, etc.

(6) If I have any questions about the test I will contact the testing firm immediately. (515) 518-0249

TEST ADDRESS

Occupant or Responsible Party ________________________________________________________________

Test Address ________________________________________________ Date ______________


City ______________________________ Technician _____________________________________

State _____________ Zip _____________ Certification #: _________________ Date ______________

(Get 2 signed copies, 1 to keep and 1 for the client)


EXHIBIT B-2


1880 Brodie Street

Waukee, IA 50263

(515) 518-0249

School Testing Programs

RADON INSPECTION DECLARATION OF VOLUNTARY COMPLIANCE

As the responsible party for the test location listed below, I hereby acknowledge receipt of the EPA’s “Radon Measurement in Schools

– Revised Edition”. I further understand that school officials will be making important decisions pending the outcome of this test.

Given this information I hereby certify that:

(1) I agree to maintain closed building conditions (except for normal entry and exit) for at least 12 hours prior to the start of the

test.

(2) I agree to keep all external doors and windows shut during the entire test period except for normal entry and exit.

(3) I will not knowingly alter the test environment in any way including, but not limited to, raising or lowering the thermostat(s)

or changing HVAC fan controls, or moving the test device(s).

(4) I understand that the HVAC settings must be maintained as would be deemed normal for a typical school week.

(5) I will not touch, tamper with, remove, cover, or change the location of the test device(s).

(6) I will report any circumstances that occur during the test that may influence the final results such as unusual or severe

weather, power outages, etc.

(7) If I have any questions about the test I will contact the testing firm immediately. (515) 518-0249

TEST ADDRESS


Occupant or Responsible Party ________________________________________________________________

Test Address ____________________________________________________ Date _________________

City ______________________________ Technician _____________________________________

State _____________ Zip _____________ Certification #: _________________ Date ______________

(Get 2 signed copies, 1 to keep and 1 for the client)


APPENDIX C

SCHOOL ADMINISTRATOR NOTIFICATION


1880 Brodie Street

Waukee, IA 50263

(515) 518-0249

MEMORANDUM

To: School Administration

From: Paul Gehrke


Subj.: Radon Testing Notification

The packet information is being provided to you because Inspect Des Moines, LLC has been contracted to test your

school for radon gas. Radon gas is a known human carcinogen and is the leading cause of lung cancer in non-smokers.

This package includes copies of the US EPA’s A Citizen’s Guide to Radon. Inspect Des Moines, LLC recommends that

all teachers as staff are provided a radon information packet which includes the EPA guidance.

Inspect Des Moines, LLC would be happy to participate in a meeting that could familiarize the teachers and staff with

the testing requirements, explain the test devices to be used, and answer other radon-specific questions.

In general, the teachers need to understand and relay to their students the importance for not touching the radon test

devices. Tampering with the test devices may invalidate the testing project, requiring retesting and incurring additional

costs. Closed-building conditions will also need to be maintained 12 hours prior to testing and during the testing period.

Closed-building conditions require all windows to remain closed and the outside doors are not propped open. Normal

entry and exit from the building is allowed.

The lung cancer risks from radon gas increase the longer one breathes radon combined with the radon level being inhaled.

There is no point at which lung-cancer can be predicted, so the US EPA recommends bringing down the radon levels as

low as reasonably achievable. Since radon exposure may be higher in the homes of the students and staff, it is important

that the school recommends that the homes of the students and staff are also tested. Inspect Des Moines, LLC can

provide an example of a letter that can be sent home with the students so the parents understand radon exposure risks and

know how they can have their own homes tested for radon gas.

Additional radon information can be downloaded from the US EPA’s radon website, found at http://www.epa.gov/radon.



APPENDIX D

ASSESSING RESULTS FOR DUPLICATES AND SPIKES

D.1 Assessing Results of Duplicate Quality Control Samples (Precision Measurements)

Measuring radioactive substances, such as radon gas, can be made more difficult due to encounters with random

obstacles. Obstacles met when measuring radon gas with activated charcoal include, but are not limited to, variations of

radon at the test location, differences in the test kits, care taken during test kit deployment, and background radiation

levels at the laboratory. Therefore, side-by-side radon samples are expected to produce slightly different results.

It is critical to understand, document, and monitor your precision error. This knowledge and documentation will allow

you to characterize your precision error to clients. Furthermore, the continual monitoring of precision provides a check

on every aspect of the measurement system.

In order to determine when the differences in side-by-side (duplicate) measurements are larger than expected, EPA

recommends calculating and analyzing the relative percent difference (RPD) between the duplicates. The RPD is

calculated as the difference between the two samples divided by the average of the two samples. In order to be able to

fully assess precision, a minimum of 20 duplicate pairs must be completed.

Figure D-1: Calculating Relative Percent Difference (RPD)

Relative percent difference calculations can expect larger percent errors for duplicates with less radon than errors for

duplicates exposed to higher radon levels. In order to keep the two ranges in proper perspective, two sets of control

charts have been developed. Since very low radon levels magnify the RPD between samples, it is inappropriate to

calculate the differences for duplicates with averages below 2.0 pCi/L. Therefore, one control chart will be maintained to

display and analyze duplicates where the average is between 2.0 and 3.9 pCi/L and a second control chart will be used to

assess duplicates averaging 4.0 pCi/L or higher.

Air Chek has had extensive experience assessing the natural agreement between duplicate pairs and has set a warning

level and a control limit for each control chart. The data from hundreds of radon chamber exposures was analyzed in

order to determine these warning and control thresholds. For duplicates averaging between 2 and 4 pCi/L (Figure D-3),

the warning level is set at 32 % and the control limit is set at 40%. When duplicates average 4 pCi/L or higher (Figure D-

4), the warning level is 24% and has a 32% control limit. The warning level means that RPDs above this percent is

expected only 5% (1 out of every 20 pairs) of the time, and the control limit should be exceeded only 1% (1 out of 100

pairs) of the time. When results of duplicates fall outside of the warning level, Paul Gehrke will contact Air Chek

immediately.

D.2 Assessing Results of Spikes (Monitoring Bias)

Air Chek has set the objective for relative bias as an individual relative error (IRE) of +/- 16%. Most State and EPA

guidance uses a +/- 25% criteria, however the manufacturer feels that fresh test kits should be able to respond within the

+/- 16% goal when returned to the laboratory using 2-day courier delivery service. This relative bias is calculated as the

difference between the measured and the reference value divided by the reference value.

Calculation for Determining (RPD)

RPD = |D1-D2| / ((D1+D2) / 2) x 100%

where:

RPD = Relative Percent Difference

D1 = measured value of the first duplicate

D2 = measured value of the second duplicate

Sample Calculation for Determining RPD

Where: D1 = 6.1 pCi/L

D2 = 5.5 pCi/L

RPD = |6.1 - 5.5| / ((6.1 + 5.5) / 2) X 100%

RPD = 0.6 / ( 11.6 / 2) X 100%

RPD = 0.6 / 5.8 X 100%

RPD = 10.3%


To assess the results of spiked measurements over time, the results are plotted on a means control chart. One of the key

elements in spike control charts is to assess the laboratory accuracy over a period of time. As the quality assurance

program gathers more and more data, control charts will begin to have a higher degree of reliability because more data

will be taken into account. The results of known exposure measurements, or spikes, are plotted on a spike control chart

(Exhibit D-5). The centerline is set at zero, and the warning and control limits are set at +/- 16% and +/- 24%

respectively.

Figure D-2: Calculating the Individual Relative Error (IRE)

Paul Gehrke plots the results from the spikes on the appropriate control chart as results are available, and checks the

results as soon as they are plotted. Ideally, the plotting of spike results should show an even distribution of spikes above

and below the zero percent (0%) centerline. Radon kits that have been in storage for extended periods may lose

efficiency, resulting in a much greater number of results falling outside the warning level. When results of spikes fall

outside of the warning level, Paul Gehrke will contact Air Chek immediately.

Calculating the Individual Relative Error (IRE)

IRE = ( MV – TV ) / TV x 100%

Where:

IRE = Individual Relative Error for each

measurement

MV = measured value for the spike

TV = radon chamber target value

Sample IRE Calculation

Where: MV = 6.4 pCi/L

TV = 6.1 pCi/L

IRE = ( 6.4 – 6.1 ) / 6.1 x 100%

IRE = 0.3 / 6.1 X 100%

IRE = 4.9%


Figure D-3

Control Chart for Relative Percent Difference (RPD) Based on an “In Control” Level of 24% (For duplicates

where average >2 pCi/L but <4 pCi/L or 0.02 WL)

Control Limit - Expect to see duplicates produce RPD greater than

40% only 1% of the time (1/100 chance)

Warning Level - Expect to see duplicates produce RPD greater than


In Control Level - Expect to see results routinely produce

this result

Figure D-4

Control Chart for Relative Percent Difference (RPD) Based on an “In Control” Level of 16%

(For duplicates where average >4 pCi/L or 0.02 WL)

Control Limit - Expect to see duplicates produce RPD greater than


Warning Level - Expect to see duplicates produce RPD greater than


In Control Level - Expect to see results routinely produce this result

Date and Measurement Number

40%

32%

Relative Percent Difference (RPD)


32%

24%

Relative Percent Difference (RPD)


Figure D-5

Example Control Chart for Plotting Spike Results ( > 4.0 pCi/L)

Control Limit

Warning Level

In Control

In Control

Warning Level

Control Limit

Figure D-6

Example Control Chart for Plotting Spike Results ( >2.0 and < 4.0 pCi/L)

Control Limit

Warning Level

In Control

In Control

Warning Level

Control Limit

Individual Relative Error (IRE)

0%

16%

24%

-16%

-24%


Individual Relative Error (IRE)

0%

24%

32%

-24%

-32%



APPENDIX E Radon Test In Progress Notifications


Exhibit E-1

Sample Radon Test In Progress Door Hanger


Exhibit E-2 SAMPLE RADON TEST IN PROGRESS NOTIFICATION SIGN

APPENDIX F

Radon Testing Checklists and Testing Logs

CAUTION!

RADON TEST IN PROGRESS

CLOSED BUILDING

CONDITIONS MUST BE MAINTAINED:

ALL WINDOW AND DOORS

MUST BE CLOSED EXCEPT FOR BRIEF DOOR OPENING

FOR ENTRY AND EXIT.

HEATING AND AIR CONDITIONING SYSTEMS SHOULD BE

OPERATED IN THE AUTO MODE DURING CLOSED

BUILDING CONDITIONS.

PLEASE CALL NUMBER BELOW FOR ADDITIONAL INFORMATION CONCERNING

TESTING OF THIS BUILDING


Paul Gehrke


APPENDIX F

Radon Testing Checklists and Testing Logs


Test Type

____ Real Estate (2 kits)

____ Initial

____ Follow-Up

____ Post-Mitigation

____Other: ____________

______________________

Structure Info: (Check all that apply)

____ Basement

____ Slab-on-Grade

____ Crawl-Space

Vents: Open or Closed ?

Age (years): ___ # Floors: ____

Residence Type: (Check all that

apply)

___Single Family ____ Condo

___Town Home ___ Apartment

___ High Rise

Heat/Air System Type

_______________________

_______________________

_______________________

EXHIBIT F-1

Residential Radon Testing Log

ProChek Activated Charcoal Test Kits

Date: ___/____/___ Job #: _____________________

Client Name: _______________________________________

Test Address: _______________________________________

City: ________________________________ State: _________

Zip Code: _________________

Placement Technician: __________________________________Certification #: ________________

Retrieval Technician: __________________________________ Certification #: ________________ Technician Signature(s): _________________________________________________________________

Weather Conditions: __________________________________________________________________

Start Date: ____________ Start Time:_________________ Floor:____ Temp: ______

End Date: ____________ End Time: _________________

Serial number:________________ Serial number:________________

Placement location:__________________________________________

Serial number:________________ Serial number:________________

Placement location:__________________________________________

Verify and Check Each Item:

_____ Information provided to responsible party regarding test conditions.

_____ Obtained or attempted to obtain a signed non-interference agreement.

_____ Closed-house conditions maintained upon arrival.

_____ Posted a Radon Test in Progress notification at the test site.

_____ Conducted a visual inspection of the building during placement.

_____ Conducted a visual inspection of the building during retrieval.

Comments Damage:____________________________________________________________________________

______________________________________________________________________________


EXHIBIT F-2

Test Condition Checklist for School Testing

School Name: ___________________________________ Date: _____/______/_____

Address: _______________________________________

City: ________________________________ State: ______ Zip Code: _____________

Verify Each of the Following Items and Check When Complete

_____ Information provided to school administrators, teachers, and staff regarding test conditions.

_____ Staff was informed about the radon testing project

_____ Obtained or attempted to obtain a signed non-interference agreement.

_____ Closed-building conditions maintained upon arrival.

_____ Posted Radon Test in Progress notifications in the school.

_____ Conducted a visual inspection of the building during detector placement.

_____ Conducted a visual inspection of the building during detector retrieval

Weather Conditions _________________________________________________________________________

__________________________________________________________________________________________

___________________________________________________________________________________________

Technician: _____________________________________ Certification #: _________________ Technician Signature: __________________________________Date: ____________________




EXHIBIT F-3 Radon Placement Log – School Testing


APPENDIX G

Radon Test Reports


Dates of Test: 2009-02-10 @ 2:00 pm to 2009-02-12 @ 2:00 pm

Property Address Test Number Analysis Date Result

1st Floor Bedroom

210 Cardinal Rd

Akron, OH 44312

4984989 2008-02-18 5.5 pCi/l

4984990 2008-02-18 5.9 pCi/L

Average 5.7 pCi/l

Interpreting your Test Result

The USEPA states that a home with this average radon level should be mitigated. Additional information is

available from the EPA "Home Buyer's and Seller's Guide to Radon." You may also obtain this information by

contacting your state radon office at 1-800-523-4439.

� No tampering was observed during the radon test.

Exhibit G-1

Residential Test Report

Radon Measurement Technician Device Information

Inspect Des Moines, LLC Pro Chek Activated Charcoal

Paul Gehrke Serial#: 4984989,4984990

(515) 518-0249 Analyzed by: Air Chek, Inc. Real Estate Radon Test Information

The subject home described has been tested for the presence of radon gas according to US EPA short-term testing protocols. The

test and analysis have been performed to comply with EPA's Home Buyer's and Seller's Guide to Radon. This report represents

the average radon concentration at the time of sampling and at the specific location in the building. However, it must be noted that

radon concentrations will vary from day to day and from season to season.

________________________________________ ___________________

Technician Signature Date

Limitation of Liability: While we at Air Chek, Inc. make every effort to maintain the highest possible quality control and include several checks and verification steps in our

procedures, we make NO WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTY OF

MERCHANTABILITY OR FITNESS with respect to any item furnished, information supplied or services rendered you by Air Chek, Inc. Before any action is taken on the

basis of test results given to you by Air Chek, Inc. we recommend that further testing be done. Neither Air Chek, Inc., nor any of our employees or agents, shall be liable under

any claim, charge, or demand, whether in contract, tort or otherwise, for any and all losses, costs, charges, claims, demands, fees, expenses, injuries or damages (including

without limitation INCIDENTAL OR CONSEQUENTIAL DAMAGES WHICH ARE EXCLUDED) of any nature or kind arising out of, connected with, resulting from, or

sustained as a result of any item furnished, information supplied, or service rendered to you by Air Chek, Inc.

NRPP Lab ID: 101138AL

<Analysis Date>

<Company Logo>


1880 Brodie St

Waukee, IA 50263

(515) 518-0249


Your health risk

The primary health risk from long−term exposure to radon is lung cancer. The risk of developing a lung cancer from radon exposure depends both on

how much radon is present and how long you are exposed to radon. The higher the radon level or the longer the time of exposure, even if the levels

are relatively low, the greater the risk. Exposures up to 4 pCi/L may present some risk of contracting lung cancer to more sensitive occupants,

especially children and those who live with smokers. The US Congress set as a goal the lowering of radon levels in buildings to equal the levels of

outside air.

PERFORMING RADON TESTS FOR A REAL ESTATE TRANSACTION

US EPA protocols state that when using passive devices, such as activated charcoal tests, two short−term tests should be conducted, either together

or sequentially, at the same location in the building. The tests should be averaged together and if the average is 4.0 pCi/L or higher, radon mitigation

is recommended. Even if the average is below 4.0 pCi/L, the buyers should consider testing in a different season or deploy a long−term test device to

assess their long−term risks. It is highly recommended that any property transaction tests be conducted by a non−interested third party. To locate a

listed or certified radon tester, contact your state radon office or visit our website at http://nrpp.info to download a list of AARST−NRPP certified

testers. You should also visit the EPA website to download a copy of EPA's Home Buyer's and Seller's Guide to Radon.

Radon Test Device Placement

The US EPA recommends that testing device(s) be placed in the lowest level of the home that could be used regularly, whether it is finished or

unfinished. Conduct the test in any space that could be used by the buyer as a bedroom, play area, family room, den, exercise room, or workshop.

Based on their client's intended use of the space, the qualified testing professional should identify the appropriate test location and inform their client

(buyer). Do not test in a closet, stairway, hallway, crawl space or in an enclosed area of high humidity or high air velocity. An enclosed area may

include a kitchen, bathroom, laundry room or furnace room.

Variations in Radon Levels

When tests are performed in different seasons or under different weather conditions, the initial screening and follow−up tests may vary considerably.

Radon levels can vary significantly between seasons, so different values are to be expected. Even during normal weather, indoor radon levels may

rise and fall by a factor of two on a daily cycle; for example, from 5 pCi/L to 10 pCi/L in 24 hours. During rapidly changing or stormy weather, the

levels may change more dramatically. Because continual changes in radon levels are considered normal, expose the testing device for as long as is

practical, while following the manufacturer's recommendations. This, of course, provides a better overall average of the measurement.

If you are comparing tests, or are averaging a series of tests, bear in mind that any radon test returns only the average of the levels present during a

specific period of time at the precise location of the test. Conditions during a different test period or at a different location in the building are

expected to be different.

Test results can also vary if the radon test instructions were not carefully followed. A laboratory measuring radon in samples taken outside the lab

must rely on the person conducting the test. For example, the wrong starting or ending date of a test will

significantly affect the calculated result. The location of each radon test can also influence the result. For example, a test placed in the blowing air

stream of a fan is likely to collect more radon than it would under normal conditions. Also, three tests conducted in one home, but in three different

rooms, would be expected to have at least slightly different test results.

Test results from a properly used activated charcoal test will more closely reflect the average radon concentrations over the last three to four days of

the test period. This happens because the radon collected by the activated charcoal has a radioactive half−life of only four days. Thus, much of the

radon collected early in a seven day test has already begun to decay prior to the conclusion of the test.

Retesting

It is important to understand that radon levels can change at some point in the future. Therefore, it is important to retest when there is occupancy by a

new owner, before and after a new addition to the house, alterations that could alter ventilation patterns, if major cracks are noticed in foundation

walls or the slab, you begin using a ground contact area of the home not previously tested, or even recent nearby construction blasting or

earthquakes. EPA recommends that homes be retested every 2−3 years. If the home has been previously mitigated or alterations are made to the

mitigation system, retesting should be done.

Mitigation

When radon mitigation is necessary, it is advisable that a state−licensed or nationally− certified contractor be used to design and install the mitigation

system. For easy to read mitigation information, go to the US EPA website and download a copy of the Consumer's Guide to Radon Reduction.

For technical information, call (828) 684−0893. Office hours are Mon−Fri 8:30 to 5:30 EASTERN

You can reach us by Fax at (828) 684−8498 or write to Air Chek, Inc., Box 2000, Naples, NC 28760

Web Site: http://www.radon.com Email to: [email protected]


Exhibit G-2

School Project Report Template

___________School Project

(Example: Akron School System Radon Project Report)

Specific School Name (i.e. Revere Middle School)

Address

City, State and ZIP

School phone number

Name of School Contact Person

Measurement Company Name

Address

Phone number

Name of Contact Person

Report Generated by____________

(This is a person not a company and have them sign the report here)

Signature_________________________ Date______________


POINTS FOR INCLUSION IN YOUR PROJECT REPORT:

Begin your report with a statement such as: Your Inspect Des Moines, LLC performed radon measurements at

<School> according to EPA protocols during the month of <Month> <Year>.

List your Company participants for radon measurements by Name and Certification/License Numbers – create signature

lines which are signed and dated by each licensed person.

List the type of radon measurement device utilized in the school, a brief description of this device and the manufacture’s

instruction for use.

List the Laboratory/Manufacturer including the Lab Contact, Address, City, State and Zip

For the purposes of this report begin here to discuss your Radon Testing activity. Include in your report, a statement of

what the EPA outlines for device placement when testing a school. This specific information can be found on page 7 of

the “Radon Measurement in Schools” document. This part of your report should be a written explanation of how, why

and where you performed testing for this school. Note any brief EPA references to protocols for radon testing in schools

when trying to explain why, how and where etc. Add any general information from any items in your comments areas

from your logs that need to be noted in writing. And reference the school floor plan illustration(s) in Appendix 1 to

demonstrate the actual locations where your radon test kits were placed. This document is very important. You

have to either have this document up front or do a thorough walk through and sketch your own, before you do any testing.

This eliminates the need to outline room by room information in the body of your report as it will be depicted in the floor

plan sketch. As you explain this testing project in general terms, you can also refer to the testing spread sheet document

that is produced by Air Chek (Appendix 2) as a reference to the breakdown of which specific rooms were tested, the test

results, times and dates of measurements.

If there was any follow-up testing, discuss in detail why you did the follow up-testing, where specifically it was

performed, the dates, times and what devices, listing the specific kit numbers, etc. This information should be taken from

a log that you have already built when performing the follow-up testing. If for reasons other than elevated test results,

such as weather conditions, no HVAC running, or closed building conditions were not observed, you should outline those

as well as citing the EPA protocol requirements and the reason for your findings and conclusions. (Reference

Appendix 3)

Please state in this report whether tampering with radon measurement devices occurred or not. If tampering occurred

with the test kits and your follow-up testing takes place only because of tampering, you will need to discuss this in detail.

Hopefully you have discussed tampering and you have a plan that you all agreed on, before the job began. Refer to your

appendix on specific locations and what was found if in fact tampering occurred. You need to conclude this section of

your report with findings and recommendations to the school for any follow-up testing if there isn’t an agreement before

hand. (Reference Appendix 4)

Include a statement regarding the outdoor weather conditions during the entire time of the test period. Explain that it was

tracked during the test period, how you did this and if it was any factor regarding radon test results. Weather information

to track would include precipitation (types and amounts), temperatures, wind speeds, and atmospheric pressures. Be

certain to cite the source(s) of this information. Weather information is to be reported from a reliable source, not your

measurement equipment. Refer to your appendix as a place to find details on this information. (Reference Appendix 5)


Include QA information in this report. Explain what it is and make a brief explanation of the EPA requirements. (Refer

to the EPA device protocols for your specific device utilized and the school protocol document in this report for

assistance to who reads the report) Discuss that QA was performed, what those items were (Spikes, duplicates, blanks

and crosschecks, calibrations, etc.) and summarize the findings from your calculations and charts. (Reference QA

information in Appendix 6)

Discuss “Closed Building Conditions”, what they are and add your observations. Add a disclaimer if you have one.

Discuss in your report that testing a school building requires the HVAC system operates normally during the time period

of the test and add your observations regarding this issue. Adding this HVAC information to your compliance document

is recommended. Reference the compliance document you had them sign and provide a copy of it in Appendix 7.

Finally, at the end of your report include a discussion of your findings and recommendations which need to be stated

clearly in paragraph form. For example: if there are elevated radon levels found in classrooms, provide an outline of

what they are by room and kit number and your recommendations citing EPA protocol. Include any supplemental

information references and place copies of your referenced documents such as the schools measurement protocol

publication. (Reference Appendix 8)

*****You need to copy this FULL REPORT before submitting it to the school

and keep it on file!!

APPENDIX LIST

Appendix 1: The floor plan illustration with specific placement noted or marked clearly on the document.

(Note**Marking in red is often effective. Keeping a clean copy handy for future reference is a good

practice.)

Appendix 2: Air Chek school test report

Appendix 3: Follow-up testing report (can be your own log or one from Air Chek)

Appendix 4: A log of Tampering information outlined in specific detail according to kit number, location of the device

when placed, what were the findings when you returned, etc. (Kits removed, windows open, kits were

moved, kits were marked by someone else, kits damaged beyond recognition, etc.)

Appendix 5: Weather documentation collected during the test period.

Appendix 6: QA/QC specific data. (Blanks, Duplicates and Spikes)

Appendix 7: “Closed-Building Conditions”, findings and/or disclaimers

Appendix 8: Supplemental (Radon) information publications.


Exhibit G-3 Radon Test Report – Schools

February 5, 2014 ** LABORATORY ANALYSIS REPORT ** Pg 1 of 1

JAMES MADISON ELEMENTARY

WEST BUILDING

Kit # Room Id Started Ended pCi/L Analyzed

2571817 103 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 5.6 2014-02-05

2571818 104 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 3.4 2014-02-05

2571820 128 2014-01-30 @ 4:00 pm 2014-02-03 @ 2:00 pm 4.7 2014-02-05

2571806 130 2014-01-30 @ 4:00 pm 2014-02-03 @ 2:00 pm 3.6 2014-02-05

2571813 131 2014-01-30 @ 4:00 pm 2014-02-03 @ 2:00 pm 2.9 2014-02-05

2571810 133 2014-01-30 @ 4:00 pm 2014-02-03 @ 2:00 pm 3.9 2014-02-05

2571815 137 2014-01-30 @ 4:00 pm 2014-02-03 @ 2:00 pm 4.4 2014-02-05

2571811 138 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 1.7 2014-02-05

2571801 140 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 1.8 2014-02-05

2571803 142 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 1.4 2014-02-05

2571808 143 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 2.9 2014-02-05

2571805 143 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 2.5 2014-02-05

2571807 144 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 2.6 2014-02-05

2571809 145 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 4.7 2014-02-05

2571802 146 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 6.1 2014-02-05

2571819 NURSE 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 4.7 2014-02-05

2571804 GYM 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 7.8 2014-02-05

2571814 LOUNGE 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 4.6 2014-02-05

2571812 LOUNGE 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 4.3 2014-02-05

2571816 OFFICE 2014-01-30 @ 3:00 pm 2014-02-03 @ 2:00 pm 3.5 2014-02-05 Air Chek, Inc. 1936 Butler Bridge Road Mills River, NC 28759-8792

Phone: (828) 684-0893 Fax: (828) 684-8498


APPENDIX H

Residential Summary Report Spreadsheet


APPENDIX I INTERNAL AUDIT CHECKLIST



APPENDIX J Radiological Safety Plan Guidance

Guidance for Developing a Radiological Safety Plan*

Guidance sheet for developing a safety plan for radon measurement

The following contains guidance for developing a radiological safety plan. This guidance can be used for the Mitigation Specialist/Contractor portions of their measurement program as well as the Radon Tester. All of these elements should be included in your safety plan. Mitigation Contractors should additionally address other safety aspects regarding mitigation installation, such as the requirements of OSHA.

Element 1. A commitment to track occupational exposure. A statement such as: “I will implement a radiological safety plan whereby I will track and document exposure information to ensure that occupational exposures do not exceed 30 pCi/L, 0.33 WL based on continuous work place exposure for 40 hours per week, 52 weeks per year or 4.0 WLM per year.”

Element 2. A statement with regard to ALARA. Such as; “I will follow the ALARA principle while considering exposure investigational levels for myself and company employees.” ALARA stands for “As Low As Reasonably Achievable.” This philosophy underlies all aspects of the various tasks which make up a radiological safety program. The principle of ALARA means that you are ensuring that the occupational exposure to you and your workers is as low as reasonably achievable. In general, investigational levels are a one tenth value.

Element 3. A statement that describes the maximum occupational exposure level along with what actions would be taken should you meet or exceed that level. When you set a maximum exposure level of 4 WLM per year as a maximum dose for you and your workers, and you adopt the ALARA principle, your investigational level begins at ten (10) percent of the maximum level set or that level which you set that you believe is reasonably achievable below the maximum established limits. Therefore, for this example ten (10) percent of 4.0 WLM is 0.4 WLM. That would be the level at which you would begin to question and investigate how much exposure everyone is getting from the various jobs they have been on and what to do to alter the techniques you are currently using to lower exposures. To limit exposures, time spent in the field should be reduced. Such as, always talking to your client in the upper levels of the home or outside in nice weather, as opposed to discussing the protocols of Radon testing in the basement. Investigations to determine assurance that everyone is within the maximum level should be conducted regularly.

Element 4. An outline of the method you will use to determine maximum exposure levels, this should include, but not be limited to:

• The formula for determining working level months (WLM) • The devices you will use for detection • How often you will calculate exposures • Whose exposure levels are you tracking • How long are you going to keep your records, etc.

***** Page 2 of this form is an example of the formula you will need to utilize for converting WL into WLM. If you have any questions regarding this information please contact our office at (828) 684-0893 x812.

* This guidance was developed by the Ohio Department of Health under their radon licensure program.


Formula for determining WLM

Working Levels multiplied by the duration of exposure (in hours) and divided by 170 equals WLM For Example: 1.0 WL for 6 hours

0.60 WL for 2 hours 0.02 WL for 8 hours

Calculation: 1.0 WL X 6 equals 6.0 6.0 divided by 170 = 0.035 WLM

0.06 WL X 2 equals 0.12 0.12 divided by 170 = 0.0007 WLM 0.02 WL X 8 equals 0.16 0.16 divided by 170 = 0.0009 WLM

____________ Total .0366 WLM

Here is a review of the formulas you will need for converting pCi/l to WL. Rn = WL x 100 (An ER of 0.5 is commonly assumed as an average.)

ER WL = Rn x ER

100 Just for your information...... ER = WL x 100 or Radon Decay Products x 100 pCi/l Radon


APPENDIX K EPA Protocols and Guidance Documents used by Inspect Des Moines, LLC

Attached are photocopies of the front covers of the EPA Protocols currently used by Inspect Des Moines, LLC

Included Document Name and Number

(� when attached)

�� A Citizen’s Guide to Radon

[EPA 402-K-07-009, Revised May 2007]

�� A Consumer’s Guide to Radon Reduction

[EPA 402-K-06-094, December 2006]

�� Home Buyer’s and Seller’s Guide to Radon

[EPA 402-K-06-093, November 2006]

�� Indoor Radon and Radon Decay Product Measurement Device Protocols

[EPA 402-R-92-004, July 1992]

�� Protocols for Radon and Radon Decay Product Measurements in Homes

[EPA 402-R-92-003, May 1993]

�� Radon Measurement in Schools – Revised Edition

[EPA 402-R-92-014 July 1993]

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