N.J. Admin. Code § 7:28-27.10

Current through Register Vol. 56, No. 24, December 18, 2024

Section 7:28-27.10 - Quality control measures

(a) Authorized proficiency testing shall be conducted in accordance with N.J.A.C. 7:28-27.6(a).

(b) Each portable device on the business's certification shall be calibrated in accordance with N.J.A.C. 7:28-27.6(b).

(c) Throughout each month, a certified radon measurement business shall conduct the lesser of 10 percent duplicates or 50, for each portable and non-portable device type and distributed among New Jersey tests conducted by affiliates and individuals not subject to certification pursuant to N.J.A.C. 7:28-27.1(c)1 and 2. When a continuous radon monitor is used for testing and there is no other continuous radon monitor available, another type of device shall be used.

1. The RPD shall be calculated for each duplicate pair and the certified radon measurement business shall use the following minimum criteria for all duplicate analyses:

Average of the two test devices	Warning Limit Triggered	Control Limit Triggered
>/= 4.0 pCi/L	RPD > 28.0%	RPD > 36.0%
2.0-3.9 pCi/L	RPD > 50.0%	RPD > 67.0%
< 2.0 pCi/L	Absolute value of the difference between the two tests is >1 pCi/L if both tests are above the minimum detectable concentration	n/a

2. If more than five percent of the checks fall within the warning limit or more than one percent of the checks fall outside the control limit for a device, the certified business shall investigate, take corrective action, and document the investigation and corrective action. If the limit continues to be exceeded, the business shall take the affected devices out of service until the problem is identified, corrected, and documented.

(d) Throughout each month, a certified radon measurement business shall conduct the lesser of five percent blanks or 25, distributed among New Jersey tests conducted by affiliates and individuals not subject to certification pursuant to N.J.A.C. 7:28-27.1(c)1 and 2.

1. The minimum control limits for blanks shall be as follows:

Device	Control Limit
Non-portable	>Minimum Detectable Concentration
Electret	>= 2 volts, or as recommended by the manufacturer for that configuration

2. If blank results fall outside the control limit for a device, the certified business shall investigate, take corrective action, and document the investigation and corrective action. If the limit continues to be exceeded, the business shall take the affected device out of service until the problem is identified, corrected, and documented.

(e) A certified radon measurement business shall provide instructions for deploying devices for blank measurements, and shall distribute devices for blank measurements among all the places where the devices are stored, transported, and deployed, including:

1. Side-by-side with the test;

2. At the certified business's location;

3. At the affiliate's office and storage area; and

4. In the vehicles that transport the devices.

(f) A certified radon measurement business shall conduct spike testing for electret readers that it owns. If a device is affiliate-owned, the certified individual shall conduct spike testing and shall submit the results to each certified business with which the individual is affiliated for that device.

1. Spike tests shall be conducted at a rate of three per 100 tests, with a minimum of three per year and a maximum of six per month; and

2. The certified radon measurement business shall monitor the results of spike testing and shall investigate any significant deviation from the known spike concentration.

(g) From each shipment of electret devices from the manufacturer, the device owner shall set aside the lesser of five percent or 10, which shall be evaluated at least weekly for voltage drift and results documented.

1. If a device is affiliate-owned, the certified individual shall submit the results weekly to each certified business with which the individual is affiliated for that device;

2. If the voltage loss is more than one volt per week over a three-week test period for short-term electrets, or one volt per month over a three-month test period for long-term electrets, the certified business shall investigate, take corrective action, and document the investigation and corrective action; and

3. If the limit continues to be exceeded, the certified business shall instruct the owner to take the affected device out of service until the problem is identified, corrected, and documented.

(h) Following the manufacturer's instructions, the device owner shall zero the electret reader and document results at least weekly.

1. If a device is affiliate-owned, the certified individual shall submit the results weekly to each certified business with which the individual is affiliated for that device; and

2. If the manufacturer's limits are exceeded, the certified business shall instruct the owner to take the affected device out of service until the problem is identified, corrected, and documented.

(i) Following the manufacturer's instructions, the device owner shall check the reference cells and document results at least weekly.

1. If a device is affiliate-owned, the certified individual shall submit the results weekly to each certified business with which the individual is affiliated for that device; and

2. If the manufacturer's limits are exceeded, the certified business shall instruct the owner to take the affected device out of service until the problem is identified, corrected, and documented.

(j) Each calendar quarter, a certified specialist responsible for the daily operations of the certified business shall prepare and submit to the individual who signed the application in accordance with N.J.A.C. 7:28-27.4, a written report of the results of duplicate tests, blank tests, authorized proficiency tests, calibrations, and spike tests, voltage drift, zeroing, and reference cell checks, as applicable, and any corrective action.

N.J. Admin. Code § 7:28-27.10

Amended and recodified from 7:28-27A.10 by 55 N.J.R. 165(a), effective 12/3/2022