NEW JERSEY DEPARTMENT OF ENVIRONMENTAL PROTECTION VS. RADIATION DATA, INC. (DEPARTMENT OF ENVIRONMENTAL PROTECTION) ( 2018 )


Menu:
  •                                  NOT FOR PUBLICATION WITHOUT THE
    APPROVAL OF THE APPELLATE DIVISION
    This opinion shall not "constitute precedent or be binding upon any court ." Although it is posted on the
    internet, this opinion is binding only on the parties in the case and its use in other cases is limited . R. 1:36-3.
    SUPERIOR COURT OF NEW JERSEY
    APPELLATE DIVISION
    DOCKET NO. A-1777-17T3
    NEW JERSEY DEPARTMENT OF
    ENVIRONMENTAL PROTECTION,
    Petitioner-Respondent,
    v.
    RADIATION DATA, INC.,
    Respondent-Appellant,
    ___________________________________
    Argued October 9, 2018 – Decided November 2, 2018
    Before Judges Sabatino, Haas and Sumners.
    On appeal from the New Jersey Department of
    Environmental Protection, Docket Nos. ECE 9903-10,
    ECE 9904-10, ECE 9905-10, ECE 9908-10, EER 8829-
    10, EER 8833-11, EER 1216-13, EER 15876-14, and
    EER 0798-15.
    David J. Singer argued the cause for appellant (Vella,
    Singer and Associates, PC, attorneys; David J. Singer
    and Lisa M. Leili, of counsel and on the brief).
    William R. Lamboy, Deputy Attorney General, argued
    the cause for respondent (Gurbir S. Grewal, Attorney
    General, attorney; Jason W. Rockwell, Assistant
    Attorney General, of counsel; William R. Lamboy, on
    the brief).
    PER CURIAM
    Radiation Data, Inc. ("RDI") appeals from a November 1, 2017 final
    agency decision of the Commissioner of the Department of Environmental
    Protection ("DEP"), which found RDI liable for violating several DEP
    regulations that govern radon measurement and mitigation activities in New
    Jersey. RDI is the largest radon measurement business in the State.       The
    Commissioner's final decision followed proceedings before two successive
    Administrative Law Judges ("ALJs").
    On appeal, RDI principally argues the DEP Radon Section, which
    administers the State's radon program, is wrongfully imposing regulatory
    standards upon RDI without adopting those standards through a formal
    rulemaking process as prescribed by the Administrative Procedure Act ("APA"),
    N.J.S.A. 52:14B-1 to -15.
    Among other things, RDI contends the DEP has deviated in recent years
    from the text and original stated intent of the radon measurement regulations.
    RDI asserts the DEP has done so by: (1) deeming RDI responsible for
    approximately 450 so-called "affiliate" technicians in the field whom RDI does
    not employ, pay, or control; and (2) refusing to hold accountable the home
    A-1777-17T3
    2
    inspection businesses and perhaps other companies who actually employ such
    field workers. RDI contends it is impossible, or at least infeasible, for it to
    adhere to the DEP's mandates, given its lack of effective control over the field
    workers as well as the constraints of market competition.
    RDI further argues the DEP is impermissibly enforcing a "Guidance
    Document" concerning quality assurance and control plans as a mandatory rule,
    without undertaking necessary public notice and comment.
    RDI asserts a wide range of other factual and legal arguments contesting
    the agency's findings of violations.
    For the reasons that follow, we affirm the Commissioner's final agency
    decision in part, reverse and remand it in part, and urge the DEP to engage in
    appropriate prospective rulemaking in accordance with the APA and
    Metromedia, Inc. v. Dir., Division of Taxation, 
    97 N.J. 313
    , 329 (1984).1
    I.
    Our analysis of this appeal first requires a preliminary discussion of radon
    gas detection and mitigation, and the State's overall regulatory scheme.
    1
    In a companion interlocutory appeal, A-0707-17, we issued an opinion today
    reversing a trial court's denial of qualified immunity to the DEP and its officials
    who have been named as defendants in a civil action brought by RDI alleging
    improper treatment. That matter is remanded to adjudicate the remaining claims
    in that case that are not predicated on alleged constitutional deprivations.
    A-1777-17T3
    3
    A. Radon Background
    Radon is a colorless, odorless, radioactive gas that derives from the
    natural breakdown of uranium in soils. Radon gas can infiltrate homes and other
    buildings through their foundations and then accumulate. It is recognized as the
    second leading cause of lung cancer.
    No level of radon exposure is considered entirely safe. The United States
    Environmental Protection Agency ("EPA") has set 4.0 picocuries per liter (pCi/l)
    as the "action level" for radon, meaning the level at which mitigation of the gas
    should be considered. Radon tests are often conducted in connection with
    residential real estate sales, commonly as part of the home inspection process.
    If necessary, mitigation systems can be installed to decrease the level of
    radon in a building. This is typically done by drilling a hole in the building's
    foundation and installing a pipe, which, as one witness described it, is "extended
    either up through the house, through the attic and then through the roof or that
    pipe would be curved out on an outside wall . . . draw[ing] all of the gases that
    are underneath the slab and venting them to the outside."
    B. Statutory and Regulatory Background
    In order to ensure that radon testers "use procedures and equipment which
    would provide scientifically accurate results," the Legislature in 1986 enacted
    A-1777-17T3
    4
    the Radiation Protection Act (the "RPA" or the "Act"), N.J.S.A. 26:2D-1 to -89.
    See S. Energy and Env't Comm., Statement to S. 1797 (Mar. 6, 1986). The Act
    requires the DEP to "establish a program for the certification of persons who
    test for the presence of radon gas and radon progeny in buildings," and a
    certification program for "persons who mitigate, and safeguard buildings from,
    the presence of radon gas and radon progeny." N.J.S.A. 26:2D-70, -71.
    The RPA forbids uncertified persons from testing for or mitigating radon
    gas unless they are performing testing or mitigation on a building they own or
    are performing a radon test without remuneration. N.J.S.A. 26:2D-72. The
    statute also requires certified persons to disclose the results of the tests
    performed to the DEP. N.J.S.A. 26:2D-74. The Act includes a confidentiality
    provision barring disclosure of the address or owner of a nonpublic building,
    with some exceptions, outside of the DEP, and the State Department of Health.
    N.J.S.A. 26:2D-73.2
    Notably for this appeal, the Act authorizes the DEP to "adopt rules and
    regulations to implement the provisions of [the Act]."      N.J.S.A. 26:2D-76.
    Persons performing radon testing or mitigation without the required
    2
    Consistent with this confidentiality mandate, we have sealed the portions of
    the record identifying specific buildings tested for radon and the names of their
    owners.
    A-1777-17T3
    5
    certifications or failing to report results to the DEP and keep them confidential
    are guilty of a crime of the third degree. N.J.S.A. 26:2D-77. The statute allows
    the DEP to levy penalties of up to $2,500 for each violation of provisions of the
    Act or any rule, regulation or order promulgated pursuant to the Act. N.J.S.A.
    26:2D-13. The DEP can settle claims or penalties, or collect them "in a civil
    action by a summary proceeding under 'the penalty enforcement law.'" 
    Ibid.
    (citing N.J.S.A. 2A:58-1 to -12).
    Since the Act does not specify regulatory penalties, the present case only
    involves whether RDI is liable for violations of the regulations, and does not
    concern the amount of any penalties. If the violations are upheld, the DEP will
    need to pursue a penalty action in the trial court to collect any penalties.
    The DEP promulgated regulations initially in 1990 governing the
    certification of persons for radon testing and mitigation pursuant to this statutory
    mandate. N.J.A.C. 7:28-27.1 to -27.35. See 22 N.J.R. 3516(a) (Nov. 19, 1990).
    The regulations have been periodically renewed, most recently in 2013. 45
    N.J.R. 1400(a) (June 3, 2013). The regulations are structured so that persons 3
    conducting radon testing must be approved by the DEP as either certified radon
    3
    The regulations define "person" to include businesses as well as individuals.
    N.J.A.C. 7:28-27.2. In this opinion, "person" only refers to an individual.
    A-1777-17T3
    6
    measurement "specialists" or certified radon measurement "technicians."
    N.J.A.C. 7:28-27.9 to -27.14. Similarly, persons performing mitigations must
    be approved by the DEP as either certified radon mitigation specialists or a
    certified radon mitigation technicians.       N.J.S.A. 7:28-27.15 to -27.20.
    Generally, specialist certification requires more education and is more difficult
    to obtain than technician certification.    Compare N.J.A.C. 7:28-27.9 with
    N.J.A.C. 7:28-27.12. Certification as a specialist qualifies an individual as a
    technician.    N.J.A.C. 7:28-27.9(b); -27.15(b).      Specialists can perform
    additional functions which technicians cannot perform. See e.g., N.J.A.C. 7:28-
    27.5(a)(1), -27.7(d).
    A company such as RDI offering both measurement and mitigation
    services must be approved by the DEP as a certified measurement business and
    as a certified mitigation business. 4 See N.J.A.C. 7:28-27.5, -27.7. Certified
    measurement and certified mitigation businesses are "responsible for any
    violation of the ACT committed by an employee in the scope of his or her
    4
    RDI is also a certified radon environmental laboratory. The DEP regulates
    laboratories under a different set of regulations. See N.J.A.C. 7:18-1.1 to -1.9.
    RDI asserts that some of the violations in this case involving the measurement
    business regulations concern the work of its laboratory, which it contends is not
    subject to those regulations.
    A-1777-17T3
    7
    employment. This responsibility shall be joint and several." N.J.A.C. 7:28-
    27.29 (emphasis added).
    The DEP's Radon Section administers this regulatory system.             The
    regulations require certified parties to remain in compliance with the Act and
    regulations set forth in N.J.A.C. 7:28-27.1 to -27.35. N.J.A.C. 7:28-27.3(b).
    Parties can appeal the DEP's certification denial, refusal to renew, or revocation
    by requesting an adjudicatory hearing. N.J.A.C. 7:28-27.27(a). For all of these
    certification categories, the business or person must reapply for certification
    annually. N.J.A.C. 7:28-27.22.
    C. Radon Measurement Businesses, Specialists, and Technicians
    A certified radon measurement business is a commercial business
    enterprise certified "to sell devices or test for radon and/or radon progeny."
    N.J.A.C. 7:28-27.2. In order to be certified, a measurement business must
    "maintain on staff or retain as a consultant a certified radon measurement
    specialist." N.J.A.C. 7:28-27.5(a). This specialist is charged, among other
    things, with directing the measurement activities of the business, and "shall sign
    and be responsible for the review, approval, and verification of the reports" on
    radon tests. N.J.A.C. 7:28-27.5(a)(1). The business must also at all times have
    a certified mitigation technician on staff. N.J.A.C. 7:28-27.5(i).
    A-1777-17T3
    8
    Certified radon measurement specialists are persons certified "to perform
    and/or evaluate radon and/or radon progeny measurements for a certified radon
    measurement business."       N.J.A.C. 7:28-27.2 (emphasis added).         In their
    application to the DEP for certification, specialists must include "[a] list of all
    certified radon measurement businesses for which the applicant will be a
    certified radon measurement specialist." N.J.A.C. 7:28-27.10(a)(7) (emphasis
    added). If specialists wish to function individually as a measurement business,
    they must be certified as one. N.J.A.C. 7:28-27.9(c).
    By comparison, a certified measurement technician is a person certified
    "to perform radon and radon progeny measurement activities." N.J.A.C. 7:28-
    27.2 (emphasis added). Measurement technicians must also include "[a] list of
    all certified radon measurement businesses for which the applicant will be a
    certified measurement specialist" in his or her certification application.
    N.J.A.C. 7:28-27.13(a)(5). The responsibilities of a measurement technician are
    a subset of those of a specialist. See 22 N.J.R. at 3519.
    Only certified radon measurement specialists or technicians may perform
    radon or radon progeny testing, unless an exception applies. See N.J.A.C. 7:28-
    27.3(a), -27.31. Moreover, only a certified measurement business can report the
    results of a radon or radon progeny test to property owners. See N.J.A.C. 7:28-
    A-1777-17T3
    9
    27.28 (b) (stating that measurement businesses "shall report test results for radon
    and radon progeny directly to the owner of the building and the [DEP]").
    Measurement businesses are required to develop and adhere to a plan of
    quality assurance and quality control ("QA/QC plan") for each type of
    measurement equipment they use, so as to ensure reliability and validity of radon
    measurements. N.J.A.C. 7:28-27.5(c). The QA/QC plan must contain certain
    elements required in N.J.A.C. 7:28-27.33, must "be submitted and approved by
    the [DEP] and, at a minimum, include the requirements of the authorized
    measurement protocols." 5 N.J.A.C. 7:28-27.5(c).
    A certified measurement business must also "develop and comply with a
    radiological safety plan [("RSP")] designed to keep each employee's exposure
    to radon and radon progeny as low as reasonably achievable." N.J.A.C. 7:28 -
    27.5(d). The DEP reviews and approves these plans, and the plans must include
    the requirements set forth in N.J.A.C. 7:28-27.34. 
    Ibid.
    When applying to the DEP for certification, a measurement business must
    include, among other things: the types of radon measurement equipment for
    5
    The authorized measurement protocols are "the 'Interim Indoor Radon and
    Radon Decay Product Measurement Protocols', E.P.A. 520/1-86-04,
    amendments thereto, or its latest revision; and 'Interim Protocols for Screening
    and Follow-up Radon and Radon Decay Product Measurements', EPA 520/1-86-
    014-1; page 4 and 13, and 15." N.J.A.C. 7:28-27.2.
    A-1777-17T3
    10
    which it seeks certification; identification of certified radon measurement
    specialists and technicians "employed by the business as staff members or
    consultants to be utilized by the applicant"; and copies of the QA/QC plan, RSP,
    and forms used to report results to clients. N.J.A.C. 7:28-27.6. The yearly
    application for recertification requires submission of these materials, as well as
    additional information. N.J.A.C. 7:28-27.22(b).
    Radon measurement businesses are subject to various reporting
    requirements specified in N.J.A.C. 7:28-27.28. Such measurement businesses
    must also keep certain records for five years including: records of all tests
    performed and required reporting information for the tests, records of all
    instrument calibration and quality control, and copies of certifications for all
    measurement specialists and technicians "employed by the business." N.J.A.C.
    7:28-27.21(a).
    In addition, radon measurement businesses are required to train their
    employees yearly, and must also train them when they are newly hired. N.J.A.C.
    7:28-27.34(a), (c). The DEP may conduct inspections of certified businesses.
    N.J.A.C. 7:28-27.24. Certified businesses must submit in writing to the DEP
    changes in information from their original application at least thirty days in
    advance of their use, and changes in certified personnel at least fourteen days in
    A-1777-17T3
    11
    advance of their use.       N.J.A.C. 7:28-27.3(f).     Certified businesses are
    responsible for reporting results of all measurement or mitigation activity to the
    DEP. N.J.A.C. 7:28-27.3(j).
    D. Radon Mitigation Businesses, Specialists, and Technicians
    The DEP has also established certification requirements for radon
    mitigation businesses, specialists, and technicians. N.J.A.C. 7:28-27.7 to -27.8,
    -27.15 to -27.20. A certified mitigation business is a business certified "to
    design and/or install systems in buildings to mitigate and safeguard against
    radon contamination." N.J.A.C. 7:28-27.2.
    Such a business is required to have a mitigation specialist on staff or
    serving as a consultant. N.J.A.C. 7:28-27.7(a). The mitigation specialist "shall
    perform a visual inspection and diagnostic tests, as appropriate, prior to system
    installation to determine the appropriate mitigation system to be installed."
    N.J.A.C. 7:28-27.7(d). The specialist must document these observations and
    results. 
    Ibid.
     A mitigation business "shall assure that radon mitigation system
    installations are performed under the direct supervision of a certified radon
    mitigation specialist or certified radon mitigation technician." N.J.A.C. 7:28-
    27.7(c).
    A-1777-17T3
    12
    The business must also develop and follow a RSP. N.J.A.C. 7:28-27.7(i).
    The regulations detail minimum requirements for the safety plan. See N.J.A.C.
    7:28-27.34.
    Mitigation businesses are subject to reporting requirements set forth in
    N.J.A.C. 7:28-27.28. The businesses must maintain certain records for five
    years, including: records of all mitigation work performed; records of mitigation
    plans developed, utilized, and signed by a mitigation specialist; records of all
    instrument calibration; copies of all certification applications and all
    correspondence with the DEP; and a copy of each mitigation contract. N.J.A.C.
    7:28-27.21(b).
    E. RDI's Business and An Industry Overview
    RDI was founded in 1986. Its principal place of business is in Skillman,
    New Jersey. RDI is certified by the DEP as, respectively, a radon measurement
    business, a radon mitigation business, and a radon measurement laboratory.
    According to its President, RDI is involved in more than half of the radon testing
    conducted in this State. Since 1987, RDI has processed more than one million
    radon tests.     In addition, RDI is heavily involved in the radon mitigation
    business.     DEP records apparently show that RDI installed 658 mitigation
    systems in this State in 2013 and another 627 in 2014.
    A-1777-17T3
    13
    According to its organizational chart included as an exhibit in the
    administrative record, RDI had, at that time, only five employees apparently
    involved in the radon measurement and mitigation aspects of the business: RDI's
    then President, a quality assurance and lab officer, two laboratory technicians,
    and a clerical staff member. RDI's current employees include RDI's current
    President, who is a certified radon measurement and mitigation specialist , and
    RDI's Director of Operations, who became certified as a measurement specialist
    in June of 2014 and as a mitigation specialist in September of 2014 . At oral
    argument on the appeal, RDI's counsel was unable to specify exactly how many
    of its employees currently work in the laboratory. In any event, the record
    reflects that RDI only employs a small number of employees who take part in
    the radon measurement and mitigation aspects of its business.
    F. "Affiliates"
    As will be discussed, infra, within our legal analysis, RDI depends upon
    numerous certified measurement technicians who are either employed by other
    businesses or self-employed but who have been "affiliated" with RDI.
    According to the testimony of RDI's witnesses, the regulatory scheme originally
    contemplated that all businesses who employ radon measurement technicians
    would themselves need to obtain certification from the DEP. However, at some
    A-1777-17T3
    14
    unspecified point in time, the DEP began to allow individual certified
    measurement technicians "affiliate" with a certified radon measurement
    business without being employed by that certified entity. In the instance of RDI,
    such an affiliate relationship is documented by a form letter from RDI to the
    DEP's Radon Section, representing that the particular technician, identified by
    his or her certification number, is "affiliated" with RDI. The record contains
    several examples of such form letters.
    According to RDI, an individual radon measurement technician is
    permitted to affiliate with more than one certified radon measurement
    businesses. The second ALJ found from the evidence there are "roughly 720
    affiliated technicians in the radon measurement field." The second ALJ also
    found that "roughly 400" of those technicians are affiliated with RDI, and that
    RDI's next largest competitor has "around 200 affiliated technicians."
    The proofs reflect that RDI does not employ the "affiliated" measurement
    technicians on its payroll. Nor is there evidence that RDI pays the affiliated
    technicians any money for their services. Instead, the affiliated measurement
    technicians appear to typically work for a home inspection company. The
    business or technician frequently purchases a measurement device from RDI.
    RDI apparently is also paid to conduct the laboratory testing or data analysis on
    A-1777-17T3
    15
    radon tests. These charges are typically paid by the property owner or contract
    purchaser of the building being tested, usually as part of a real estate transaction.
    RDI contends that it does not control the technicians who leave the
    sampling devices in buildings, as it neither pays those persons wages nor any
    other form of compensation. 6 RDI asserts it does not supervise those individuals
    who, in some instances, are also affiliated with one or more of RDI's competitor
    measurement business.
    RDI contends that it began "affiliating" with individual technicians only
    because the DEP ceased requiring their respective employers to be certified, and
    because the DEP has insisted on RDI accepting responsibility for the affiliates'
    work in the QA/QC criteria. According to RDI, as a result of the DEP's change
    in regulatory approach, there used to be about 300 certified radon measurement
    business in New Jersey, whereas there are now only about twenty-nine.
    6
    In a certification submitted before the administrative hearings, RDI's
    President, who is not an attorney, inaccurately alluded to the existence of
    "contractual relationships" between RDI and the affiliated technicians.
    However, in testimony at the hearings, another RDI witness clarified that the
    term "contractual relationships" was "a poor choice of words." According to
    that witness, there are no contracts between the affiliated home inspectors and
    RDI. The record shows that those individuals merely purchase test kits from
    RDI, and RDI analyzes the samples, or data, and produces the results.
    A-1777-17T3
    16
    G. Sampling Devices
    This case involves four different kinds of devices used to measure radon
    levels: (1) continuous radon monitors ("CRMs"); (2) charcoal canisters; (3)
    electrets; and (4) Alpha Track devices.       At the time of the administrative
    hearings, RDI processed tests conducted with CRMs and charcoal canisters.
    RDI had previously processed tests conducted with E-PERM brand electrets.
    Most test results reported to the DEP are derived from the charcoal
    canisters. With regard to those canisters, RDI commonly sells them to home
    inspectors; the inspectors place the canisters in buildings, and send the samples,
    along with a customer data sheet, to RDI. RDI's laboratory then analyzes the
    tests. A measurement specialist at RDI verifies the test results and reports them
    to the client and the DEP.
    With regard to CRMs and electrets, the home inspectors generally own
    their own instruments. They send the test data to RDI, whose measurement
    specialist then calculates and certifies the results and reports them to the client
    and the DEP.
    H. RDI's QA/QC Plan
    RDI has been subject to the same DEP-approved QA/QC plan since 2005,
    which includes the plans for each device it is certified to use. In particular, RDI
    A-1777-17T3
    17
    obtained the DEP's approval to use charcoal canisters, CRMs, and E-PERMS,
    pursuant to the plan.
    RDI's QA/QC plan represents that the company's "affiliated measurement
    technicians are all licensed by [the State of New Jersey], and have received the
    standard two-day course, plus annual continuous education." The QA/QC plan
    further asserts the technicians' New Jersey licenses "are maintained up to date,
    or their affiliation is terminated." The plan also states that RDI "will maintain
    records of the current licenses status of all home inspectors for whom the
    company reports radon tests to [the] DEP," because "it is company and . . .
    [S]tate policy for home inspectors to be licensed and to operate as agents of
    licensed Radon Measurement Businesses." The plan certifies that RDI "will
    refuse to process any radon test kit submitted by a home inspector whose license
    has expired."
    I. The Alleged Violations and the Administrative Proceedings
    The DEP issued nine Administrative Orders and associated Notices of
    Prosecution ("AO/NOPs") to RDI between August 2009 and December 2014.
    They allege violations of various requirements for certified radon measurement
    businesses and mitigation businesses.
    RDI appeals the following charges brought against them for:
    A-1777-17T3
    18
    Measurement Violations
     Selling radon measurement devices without the required
    certification.
     Allowing uncertified persons to test for radon/radon progen y.
     Failing to comply with various provisions of their QA/QC Plan
    including, calibration procedure violations, measurement
    procedure violations, and recordkeeping violations.
     Failing to keep records of the current license status for "affiliated"
    testers.
     Processing tests with incomplete and/or incorrect reports and data
    sheets, and reporting tests marked invalid to the DEP.
     Failing to submit all test results to the DEP.
    Mitigation Violations
     Allowing uncertified persons to perform mitigation jobs, and
    allowing a mitigation technician, not specialist, to troubleshoot
    and make design alterations on a mitigation system.
     Allowing mitigation technicians, not specialists, to perform visual
    inspections for a possible mitigation system.
    General Violations
     Failing to provide documentation on new employee and yearly
    training for affiliates.
    The DEP issued the first six AO/NOPs between August 2009 and June
    2010. RDI requested a hearing on the AO/NOPs and the DEP moved for
    A-1777-17T3
    19
    summary decision. RDI was not represented by counsel at this stage of this
    proceeding.
    On March 14, 2013, the first ALJ issued an order granting partial summary
    decision in favor of the DEP on all but two of the charged violations.
    The DEP thereafter issued three more AO/NPs between February 2011
    and December 2014. RDI requested a hearing on these three AO/NOPs. The
    matter was transferred to the Office of Administrative Law ("OAL") and
    consolidated with the initial six appeals. This consolidated case was reassigned
    to a different ALJ ("the second ALJ"). The second ALJ denied the DEP's request
    to sever the first six AO/NOPs and convert the first ALJ's partial summary
    decision into a final decision. The second ALJ also denied RDI's request 7 to
    reopen/reconsider the first ALJ's partial summary decision.
    The second ALJ held seven non-consecutive days of hearings from
    October 2015 to February 2016.       
    Ibid.
       The ALJ heard testimony from: a
    radiation physicist from the DEP's Radon Section; a research scientist (now
    deceased) from the DEP's Radon Section; and another research scientist who is
    7
    By this point, RDI was represented by counsel.
    A-1777-17T3
    20
    the supervisor of the DEP Radon Section. The second ALJ also heard testimony
    from RDI's President and its Director of Operations.8
    After considering the testimony and other evidence, the second ALJ found
    that RDI violated the various provisions of the Act and regulations, as alleged
    by the DEP in the three AO/NOPs, with the exception of two allegations in the
    AO/NOP docketed at EER 07985-15, which the second ALJ dismissed. RDI
    then filed exceptions with the DEP Commissioner.
    J. The Commissioner's Decision
    In his ensuing November 2017 final agency decision, the Commissioner
    agreed with and adopted, with certain modifications, the findings and
    conclusions of both the first ALJ's partial summary decision and the second
    ALJ's post-hearing decision.      The Commissioner's modifications primarily
    involved addressing discrete points that RDI had raised in its exceptions.
    Among other things, the Commissioner emphasized that RDI could not allow
    radon testers to affiliate with its business and reap the presumed benefits, while
    disclaiming "the responsibility inherent in that relationship."
    8
    During the course of the hearing, the DEP withdrew several allegations.
    A-1777-17T3
    21
    K. RDI's Appeal
    RDI raises several arguments on appeal. Most broadly, RDI asserts the
    Commissioner's decision is arbitrary and capricious. RDI contends the decision
    will harm the radon industry, is dangerous to public health, and is ini mical to
    the goals of the RPA.
    RDI argues the DEP engaged in improper rulemaking without following
    APA requirements. In particular, RDI alleges the DEP impermissibly changed
    its interpretation of the regulations from requiring all businesses offering radon
    testing services to obtain certification, to a contrary policy that now allows
    testers to simply affiliate with a certified measurement business, such as RDI.
    Many of the charged violations against RDI were related to radon tests
    conducted by such affiliates. According to RDI, the DEP held RDI liable for
    violations based on a mistaken interpretation that certain references in the
    regulations to "employees," "contractors," and "workers" include so-called
    "affiliates." RDI asserts that the DEP should have adopted this material change
    in regulatory responsibility through proper rulemaking procedures, in
    compliance with the APA.
    Further, RDI maintains the DEP has improperly required radon
    measurement businesses, such as RDI, to include commitments in their QA/QC
    A-1777-17T3
    22
    plans that were not duly promulgated through rulemaking.          Instead, those
    commitments allegedly have been extracted through an informal DEP "Guidance
    Document."
    RDI additionally contends that some of the violations concern the work of
    its certified laboratory, which are outside of the alleged purview of the DEP's
    Radon Section.
    Lastly, apart from these points, RDI disputes various individual violations
    and certain discrete findings of the ALJs and the Commissioner.
    II.
    A. Scope of Review
    "The 'core value[] of judicial review of administrative action is the
    furtherance of accountability.'" In re Proposed Quest Acad. Charter Sch. of
    Montclair Founders Grp., 
    216 N.J. 370
    , 386 (2013) (alteration in original)
    (citations omitted).   To assure such accountability, appellate courts are
    empowered to set aside the decisions of administrative agencies when they are
    shown to be "arbitrary, capricious, or unreasonable, or . . . lack[ing] in fair
    support in the record." In re Herrmann, 
    192 N.J. 19
    , 27-28 (2007) (citing
    Campbell v. Dep't of Civil Serv., 
    39 N.J. 556
    , 562 (1963)).
    A-1777-17T3
    23
    As we exercise this important function of judicial review, we recognize
    the "final determination of an administrative agency . . . is entitled to substantial
    deference." In re Eastwick Coll. LPN–to RN Bridge Program, 
    225 N.J. 533
    , 541
    (2016). A "strong presumption of reasonableness must be accorded [to an]
    agency's exercise of its statutorily delegated duties." In re Certificate of Need
    Granted to the Harborage, 
    300 N.J. Super. 363
    , 380 (App. Div. 1997). "The
    burden of demonstrating that the agency's action was arbitrary, capricious or
    unreasonable rests upon the [party] challenging the administrative action." In
    re Arenas, 
    385 N.J. Super. 440
    , 443-44 (App. Div. 2006).
    The heart of this appeal involves the DEP's application of the radon statute
    and regulations the agency has adopted to carry out the Legislature's objectives
    under the RPA. In that context, "'[a]n administrative agency's interpretation of
    statutes and regulations within its implementing and enforcing responsibility is
    ordinarily entitled to our deference.'" Wnuck v. N.J. Div. of Motor Vehicles,
    
    337 N.J. Super. 52
    , 56 (App. Div. 2001) (alteration in original) (quoting In re
    Appeal by Progressive Cas. Ins. Co., 
    307 N.J. Super. 93
    , 102 (App. Div. 1997)).
    However, despite that general deference to the agency's interpretations, we are
    not bound by them. In re N.J.A.C. 7:1B-1.1 et seq., 431 N.J. Super 100, 114
    (App. Div. 2013). Indeed, "[w]hile we must defer to the agency's expertise, we
    A-1777-17T3
    24
    need not surrender to it." N.J. Chapter of Nat'l. Ass'n of Indus. and Office Parks
    v. N.J. Dep't of Envt'l Prot., 
    241 N.J. Super. 145
    , 165 (App. Div. 1990). We
    therefore do not automatically accept an agency's interpretation of a statute or a
    regulation, and we review strictly legal questions de novo. Bowser v. Bd. of
    Trs., Police & Fireman's Ret. Sys., 
    455 N.J. Super. 165
    , 170-71 (App. Div.
    2018).
    B. The Metromedia/Rulemaking Issues
    RDI fundamentally argues that the DEP is attempting, in this regulatory
    compliance case, to enforce rules against RDI without appropriately
    promulgating them through public notice and comment rulemaking as required
    by the APA. First, RDI contends the DEP's expansive use of the term "affiliates"
    – a term that neither appears in the RPA nor in the text of the radon regulations
    – amounts to de facto rulemaking. Further, RDI argues that the DEP has been
    enforcing a "Guidance Document" concerning QA/QC plans as a rule, without
    conducting proper rulemaking procedures. In that regard, RDI contends it is not
    responsible for failing to adhere to its QA/QC plan because the DEP forced RDI
    to include in its plan components set forth in the informal Guidance Document
    not required by the regulations.
    A-1777-17T3
    25
    The APA generally requires state administrative agencies to adopt rules
    in accordance with the public notice and comment procedures prescribed by
    N.J.S.A. 52:14B-4(a). In re Highlands Master Plan, 
    421 N.J. Super. 614
    , 623-
    24, 630 (App. Div. 2011). These requirements likewise apply when a state
    agency "revises, rescinds, or replaces . . . any . . . existing rule." 
    Ibid.
     (alteration
    in original) (quoting N.J.S.A. 52:14B-4.9). As we have already noted, in the
    RPA the Legislature expressly delegated to the DEP the authority and
    responsibility to adopt administrative rules to carry out the radon statutory
    scheme. See N.J.S.A. 26:2D-76.
    In Metromedia Inc. v. Dir., Div. of Taxation, 
    97 N.J. 313
    , 329, 338 (1984),
    the Supreme Court held that an administrative agency must conduct formal
    rulemaking before imposing new standards upon the parties that it regulates.
    The Court determined six factors, which guide the analysis of whether such
    formal rulemaking is necessary:
    (1) [the decision] is intended to have wide coverage
    encompassing a large segment of the regulated or
    general public, rather than an individual or a narrow
    select group; (2) [it] is intended to be applied generally
    and uniformly to all similarly situated persons; (3) [it]
    is designed to operate only in future cases, that is,
    prospectively; (4) [it] prescribes a legal standard or
    directive that is not otherwise expressly provided by or
    clearly and obviously inferable from the enabling
    statutory authorization; (5) [it] reflects an
    A-1777-17T3
    26
    administrative policy that (i) was not previously
    expressed in any official and explicit agency
    determination, adjudication or rule, or (ii) constitutes a
    material and significant change from a clear, past
    agency position on the identical subject matter; and (6)
    [it] reflects a decision on administrative regulatory
    policy in the nature of the interpretation of law or
    general policy.
    [Id. at 331-32.]
    These factors, "either singly or in combination," determine whether agency
    action amounts to the promulgation of an administrative rule. 
    Id. at 332
    .
    As we now explain, both the DEP's imposition of liability upon RDI for
    the conduct of "affiliates," and certain mandates for QA/QC plans as set forth in
    a Guidance Document, meet these Metromedia criteria. Formal rulemaking as
    to these matters was required, but not performed.
    1. "Affiliate" Liability
    A core premise affecting many of the measurement violations the DEP
    cited against RDI is whether RDI is responsible for the licensure and conduct of
    "affiliate" technicians who perform sampling out in the field. The Act itself
    does not mention, in regards to the certification program, the term "affiliate,"
    nor any arguable synonym of the term, such as "representative," or "agent."
    As we have already noted, the statute does require the DEP to establish a
    program for the "certification of persons who test for the presence of radon gas
    A-1777-17T3
    27
    and its progeny in buildings," N.J.S.A. 26:2D-70, and also for the certification
    of "persons who mitigate, and safeguard buildings from, the presence of radon
    gas and radon progeny," N.J.S.A. 26:2D-71. The statute further declares that
    "no person who is not certified" shall perform such mitigation or testing on a
    building, unless he or she owns the building or is doing the work without
    remuneration. N.J.S.A. 26:2D-72. The Act does not delineate the employment
    or contractual status of such certified "persons," or expressly indicate they must
    be "affiliated" with a certified radon measurement or mitigation business.
    As we also have already stated, the text of the DEP's lengthy regulations
    governing radon measurement and mitigation does not include the word
    "affiliate" at all or any cognate term in reference to certified persons and
    businesses. The regulations do say that sampling must be performed by either a
    certified radon measurement specialist or technician. N.J.A.C. 7:28-27.9 to -
    27.14. A company providing measurement services must be approved by the
    DEP as a certified measurement business. N.J.A.C. 7:29-27.5. As we have
    noted, the measurement business must "maintain on staff or retain as a
    consultant a certified radon measurement specialist," N.J.A.C. 7:28-27.5
    (emphasis added), who must "sign and be responsible for the review, approval,
    and verification" of reports on radon tests. N.J.A.C. 7:28-27.5(a)(1). The
    A-1777-17T3
    28
    regulations do not define the term "consultant" or delineate what his or her
    business relationship must be to the certified measurement business.           For
    instance, the regulations do not make clear whether the consultant, who is not
    "on staff," can be an independent contractor, agent, or representative of the
    certified measurement business.
    With respect to liability for regulatory compliance, the regulations declare
    that certified measurement and mitigation businesses are
    responsible for any violation of the Act committed by
    an employee in the scope of his or her employment.
    This responsibility shall be joint and several.
    [N.J.A.C. 7:28-27.29 (emphasis added).]
    By choosing to use the term "employee," rather than non-employee terminology
    such as "independent contractor," the regulations appear to contemplate the
    existence of an employment relationship between the technician in the field and
    the certified measurement business, which is possibly only involved in
    supplying the testing devices and in testing the submitted samples.
    The term "scope of employment" is defined in the regulations as
    acts carried out which are so closely connected with
    what a servant is employed to do and so fairly and
    reasonably incidental to it that they may be regarded as
    methods, even though improper, of carrying out the
    objectives of the employment and furthering the
    interest of the employer.
    A-1777-17T3
    29
    [N.J.A.C. 7:28-27.2 (emphasis added).]
    This definition lends further support to RDI's argument that the literal phrasing
    of the regulations limit the term "employee" to traditional employer/employee
    relationships.9 In response to a comment at the time of the 1990 rulemaking
    about the scope of employment concept, the DEP stated, "[a]nything a
    professional does to accomplish a job for which he or she is certified or to further
    the interest of an employer are [sic] considered the scope of employment." 22
    N.J.R. at 3519 (emphasis added). The agency response suggests a broad notion
    of the kinds of activities that a certified measurement technician or specialist
    may perform that are subject to compliance, but it does not clearly express that
    a certified measurement business can be vicariously liable for the licensure and
    conduct of professionals whom do not literally "employ."
    As written, the regulations appear to contemplate that the certified radon
    technicians and specialists who gather samples in the field must be either
    9
    Because we conclude the regulations, as written, cover only the acts of
    employees of RDI and other certified measurement businesses, we need not
    discuss here the various legal tests that describe in other contexts the
    characteristics of an independent contractor, as opposed to an employee. See
    e.g., Basil v. Wolf, 
    193 N.J. 38
    , 62-63 (2007) (quoting Baldasarre v. Butler, 
    132 N.J. 278
    , 291 (1993)). It will suffice to note that the DEP does not argue and
    has not proven that the individual technicians who serve as "affiliates" are RDI's
    employees.
    A-1777-17T3
    30
    employed by a certified measurement business or, alternatively, be specialists
    who are self-employed and have certified business status. This key premise of
    the original regulatory scheme is substantiated by the DEP's November 1990
    Response to a Comment submitted in reaction to the proposed regulations:
    Comment: If a business places charcoal canisters which
    they [sic] purchase from a certified laboratory and the
    laboratory sends the results directly to the customer, the
    business placing the canister should be exempt from
    certification.
    Response: The certification process enables the
    Department to regulate a business to ensure that all
    sampling and analysis requirements are being adhered
    to and gives the Department legal authority to require
    the business to follow standard guidelines. The
    Department will be unable to determine if only certified
    persons are placing devices or that only certified
    laboratories are being utilized unless sampling
    businesses are monitored through certification. The
    Department finds no compelling reason to exempt
    businesses which only place devices from the
    certification process.
    [22 N.J.R. at 3520 (emphasis added).]
    This critically-relevant comment indicates that the regulations, as written and
    duly adopted, were designed so that home inspection companies which merely
    purchase radon tests, place them in buildings, and send the samples to a
    laboratory, still need to be certified as measurement businesses.
    A-1777-17T3
    31
    Further support for RDI's position is revealed by the DEP's 1990 Response
    to a Comment raising concerns about small businesses and sole proprietors who
    place radon test equipment in buildings. See 22 N.J.R 3517 (Nov. 19, 1990)
    (responding to a Comment that "most radon businesses are two or three man
    operations, operated out of individual homes," the DEP stated, "Since all radon
    businesses will be subject to compliance with these rules, all businesses will be
    required to employ certified individuals. Some operator/owners of small radon
    businesses will qualify as certified individuals[.]").
    The APA mandates that an administrative agency "shall consider fully all
    written and oral submissions respecting [a] proposed rule," N.J.S.A. 52:14B -
    4(a)(3), and prepare for the public a report containing the agency's response to
    the comments submitted. N.J.S.A. 52:14B-4(a)(4). The agency's responses
    must be meaningful, reasoned and supported. See Animal Prot. League of N.J.
    v. N.J. Dep't of Envtl. Prot., 
    423 N.J. Super. 549
    , 573-74 (App. Div. 2011). "The
    purpose of the APA rulemaking procedures is 'to give those affected by the
    proposed rule an opportunity to participate in the process, both to ensure fairness
    and also to inform regulators of consequences which they may not have
    anticipated.'" In re Provision of Basic Generation Serv. for Period Beginning
    June 1 2008, 
    205 N.J. 339
    , 349 (2011) (quoting In re Adoption of 2003 Low
    A-1777-17T3
    32
    Income Hous. Tax Credit Qualified Allocation Plan, 
    369 N.J. Super. 2
    , 43 (App.
    Div. 2004)).
    Despite these published responses and the plain text of the regulations, the
    DEP's witnesses at the administrative hearing contended that it has been the
    agency's "long-standing practice" to treat non-employee "affiliates" of certified
    measurement businesses as falling within the scope of those entities' oversight
    obligations and, for whom those certified businesses are, in essence, vicariously
    liable. The record suggests that the DEP has not, at least in recent years,
    required home inspection firms and other companies who employ radon
    technicians and specialists to obtain certification from the agency as a certified
    measurement business. Perhaps the practical reason for this non-enforcement is
    the economic burden that certification places upon such businesses, such as
    keeping a certified specialist on staff or under contract as a consultant, the
    various record-keeping obligations, and so on.
    The DEP argues that it has made a reasonable regulatory choice in seeking
    to hold certified measurement businesses accountable for the work of "affiliate"
    technicians, rather than requiring such field workers to be employed by a
    certified business.   That approach may well be allowable under the broad
    A-1777-17T3
    33
    umbrella of the RPA. But there are several critical legal flaws with the manner
    in which the DEP has implemented that approach.
    First and foremost, the DEP has failed to undertake formal rulemaking,
    including public notice and comment, in compliance with the APA to codify its
    "affiliate" concept and announce to the regulated community and the public in a
    transparent manner exactly what persons and businesses will be expected to have
    which obligations. The agency has done nothing formally to retract its published
    responses to the 1990 comments concerning the regulations. As Metromedia
    and other case law instructs, an administrative agency must adhere to these APA
    requirements. 
    97 N.J. at 331-32, 338
    . The absence of proper revised regulations
    addressing vicarious liability for affiliates is not a mere housekeeping chore.
    We are persuaded that the balance of the Metromedia factors compel the
    conclusion that the DEP's "affiliate" approach requires rulemaking. First, the
    DEP intends its "affiliate" requirements to have "wide coverage encompassing
    a large segment of the regulated or general public." 
    97 N.J. at 331
    . The DEP's
    definition of "affiliate" affects all measurement businesses who report tests not
    conducted by their own employees, even though RDI is allegedly the only such
    business that the DEP has sanctioned on this basis. Second, the DEP clearly
    intends to apply these "affiliate" responsibilities "generally and uniformly " to
    A-1777-17T3
    34
    similarly situated entities. 
    Ibid.
     There is no indication that similarly-situated
    certified measurement business other than RDI would face different
    requirements.
    Third, the affiliate concept amounts to "a legal standard or directive that
    is not otherwise expressly provided by or clearly and obviously inferable from
    the enabling statutory authorization." 
    Ibid.
     To be sure, the RPA gives the DEP
    broad regulatory powers. However, the regulations the DEP promulgated in
    1980 and has periodically renewed, pursuant to that authority, do not clearly
    spell out a vicarious liability obligation with respect to the conduct of affiliates.
    Fourth, while the second ALJ reasonably found DEP's interpretation of
    "affiliate" to be long-standing, there is no evidence that the DEP's interpretation
    of "affiliates" was "previously expressed in any official and explicit agency
    determination, adjudication or rule." 
    Ibid.
     As the DEP's witnesses' testimony
    shows, the affiliate concept represents a post-rule adoption revised agency
    policy decision interpreting the meaning and application of regulations and
    therefore constitutes an interpretation of "law or general policy." 
    Id. at 331-32
    .
    Lastly, although the DEP is attempting to apply the affiliate obligation
    retrospectively in this case to RDI as a basis for many claimed violations, the
    affiliate concept appears to have prospective force as well. See 
    Id. at 331
    .
    A-1777-17T3
    35
    In sum, the Radon Section's "affiliate" policy is not expressed or readily
    inferable from the text of the existing statutes, regulations, and the DEP's own
    Responses to Comments published in the New Jersey Register. As such, the
    standards have been impermissibly adopted by the DEP without appropriate
    rulemaking, in violation of Metromedia.
    An additional reason for rejecting the DEP's attempt in this case to impose
    vicarious responsibility on RDI for the conduct of affiliates stems from what
    RDI contends is the impossibility or impracticability of RDI vouching for the
    services of individual technicians whom it does not employ, compensate, or
    contractually bind through written agreements documented in the record .
    "A regulation which in practice is illusory or impossible to comply with
    is arbitrary and oppressive and would violate due process." Group Health Ins.
    v. Howell, 
    43 N.J. 104
    , 112 (1964) (citations omitted).        Comparably, the
    Supreme Court has also stated that "[s]tatutory provisions which are unworkable
    and impossible to comply with may be invalidated on the ground that they
    constitute a denial of substantive due process" and "[u]nworkable municipal
    ordinances may also be invalidated on the grounds that they are arbitrary a nd
    unreasonable." Brunetti v. New Milford, 
    68 N.J. 576
    , 599 (1975) (citations
    omitted).
    A-1777-17T3
    36
    As RDI points out, some technicians may choose to affiliate with more
    than one certified measurement business. The regulations do not specify how
    those multiple businesses are to control the activities of such "multi -affiliated"
    field workers. Nor is it clear how the measurement businesses are to coordinate
    and exercise responsibility for the required training and re-certification of such
    persons. In effect, what the DEP appears to be doing, to some extent, is to
    delegate its own direct regulatory functions to a private entity as, in effect, a
    "junior regulator."    That delegation of a regulatory responsibility is not
    permissible under the law. Absent statutory authority, agencies cannot delegate
    their regulatory responsibilities to private entities. See e.g., N.J. Soc. for
    Prevention of Cruelty to Animals v. N.J. Dep't of Agric., 
    196 N.J. 366
    , 400
    (2008) (finding a Department of Agriculture regulation, in effect, impermissibly
    subdelegated its mandate to establish humane practices to entities that could be
    described as private interests); State v. Bd. of Health, 
    208 N.J. Super. 415
    , 416
    (App. Div. 1986) (finding "[b]y its contract the Board [of Health] has sought to
    delegate its governmental responsibility to a private entity. Absent statutory
    authority, there can be no such delegation. 'This is especially true when the
    agency attempts to subdelegate to a private person or entity, since such person
    or entity is not subject to public accountability.'" (citations omitted)).
    A-1777-17T3
    37
    Apparently, the DEP envisions that private certified measurement
    businesses such as RDI will insist on its affiliates providing them with record s
    documenting their status as certified technicians. 10 But that does not assure that
    such persons are actually doing their tasks correctly out in the field. It is not
    obvious how RDI, which pays the measurement technicians no money for their
    activities, would have the economic leverage to control the quality of their work.
    Hypothetically, RDI might "de-affiliate" with certain individual technicians
    upon learning they are not complying with regulatory standards. But, as RDI
    points out, doing so might not prevent such persons from affiliating instead with
    one of RDI's competitors. Likewise, RDI asserts that it cannot feasibly restrict
    its measurement reports to only samples collected by its own employers, because
    other competitors would utilize "affiliates" unless the DEP took regulatory
    action against those competitors as well. The Commissioner's final agency
    decision presumes RDI derives a commercial "benefit" from its use of affiliates,
    but it is not clear whether the DEP itself has adopted a regulatory approach that
    makes such reliance an economic necessity.          We need not resolve these
    questions here, and they are best developed and resolved through a rulemaking
    10
    According to RDI, the DEP keeps a database of certification status and used
    to inform RDI when an individual's certification lapsed and/or expired, but has
    ceased doing so.
    A-1777-17T3
    38
    process in which the practicalities can be explored in a public, comprehensive,
    and transparent fashion, and on remand (as we discuss infra) concerning RDI in
    particular.
    The DEP argues that RDI cannot be surprised by its position concerning
    affiliates because such responsibilities are reflected in the QA/QC plans that
    RDI periodically has agreed to follow. Yet that begs the important question of
    whether the DEP has a sound legal basis in the statute and regulations to insist
    on those requirements in the first place.      Absent proper rulemaking, the
    violations dependent on such requirements cannot stand.
    2. The QA/QC Guidance Document
    We turn to the DEP's attempt to enforce the terms of its QA/QC "Guidance
    Document," which was issued without public notice-and-comment.                We
    conclude the Guidance Document likewise suffers, to some extent, from a
    Metromedia rulemaking infirmity.
    The APA allows administrative agencies to issue "regulatory guidance
    document[s]" defined as "any policy memorandum or similar document used by
    a State agency to provide technical or regulatory assistance or direction to th e
    regulated community to facilitate compliance with State or federal law or a rule
    adopted pursuant to [the APA]."      N.J.S.A. 52:14B-3a(d).     These guidance
    A-1777-17T3
    39
    documents cannot "(1) impose any new or additional requirements that are not
    included in the State or federal law or rule that the regulatory guidance document
    is intended to clarify or explain; or (2) be used by the State agency as a substitute
    for the State or federal law or rule for enforcement purposes." N.J.S.A. 52:14B-
    3a(c).
    This court has invalidated agency guidance documents that have imposed
    obligations and standards beyond those expressed in duly-promulgated
    regulations. See, e.g., In re Adoption of Reg'l Affordable Hous. Dev. Program
    Guidelines, 
    418 N.J. Super. 387
     (App. Div. 2011); In re N.J.A.C. 7:1B-1.1 et
    seq., 
    431 N.J. Super. 100
    . "[A]n agency determination must be considered an
    administrative rule when all or most of the relevant features of administrative
    rules are present and preponderate in favor of the rule-making process."
    Metromedia, 
    97 N.J. at 331
    .
    By illustration, in In re Adoption of Regional Affordable Housing
    Development Program Guidelines, 
    418 N.J. Super. at 389
    , the Council on
    Affordable Housing ("COAH") adopted "guidelines" for the implementation of
    an amendment to the New Jersey Fair Housing Act.              We concluded these
    guidelines "set forth specific standards and conditions for regional planning that
    A-1777-17T3
    40
    COAH will find acceptable in its administration of [the applicable statute]" and
    therefore constitute rules. 
    Id. at 395
    .
    We similarly invalidated DEP guidance documents in In re N.J.A.C. 7:1B-
    1.1 et seq., 
    431 N.J. Super. 100
    , relating to the "waiver" rules excusing certain
    regulatory compliance.11     In doing so, we noted the invalidated guidance
    document "lists specific procedures and instructions that waiver applicants
    should follow to prove and satisfy each of the four bases for waivers[.]" Id. at
    136. We held that all six of the Metromedia factors applied to these guidance
    documents and much of the DEP’s website postings concerning the waiver rules.
    Id. at 137.
    Here, the DEP’s QA/QC Guidance Document plainly contains certain
    mandatory language. While some features of the Guidance Document merely
    restate the requirements of N.J.A.C. 7:28-27.33 and the authorized measurement
    protocols, other provisions add requirements not found in the regulations or set
    forth specific requirements where the regulations otherwise are broadly written.
    For example, the Guidance Document lists "[r]equired data tracking information
    11
    We note that the parties agreed in the present case that the DEP waiver
    regulations, N.J.A.C. 7:1B-1.1 to -2.4, could not be beneficial to RDI since some
    of the violations pre-date those regulations and also due to the exemption for
    licensure and certification issues. See N.J.A.C. 7:1B-2.1(b)(9).
    A-1777-17T3
    41
    [that] . . . must be on all chain of custody forms and mail order information
    cards," including test location, client information, device model number,
    floor/location, and so on. The radon regulations, by contrast, merely require a
    "description of sample tracking/chain of custody procedures" including "names
    and duties of the detector custodians . . . data tracking information required to
    be entered . . . and . . . [s]amples of tracking forms." N.J.A.C. 7:28-27.33(a)(6).
    Further, the Guidance Document requires specific provisions on school testing,
    but the regulations for QA/QC Plans do not mention school testing at all. A
    DEP witness at the hearing testified that the DEP would not approve RDI's
    QA/QC plan without the school testing requirements. She candidly agreed that
    the DEP’s guidance in this respect was "more of a directive."
    The balance of Metromedia factors reflect that the Guidance Document is
    intended by the DEP to operate as an unpromulgated rule. See 
    97 N.J. at
    331-
    32. First, the Guidance Document appears intended to apply to all certified
    measurement businesses. 
    Id. at 331
    . The document states "[a]ll sections in this
    guidance document and the accompanying checklist must be included and
    discussed in your QA/QC Plan." (Emphasis added). Second, this language in
    the Guidance Document indicates its wide application as well as its intention "to
    be applied generally and uniformly to all similarly situated persons."        
    Ibid.
    A-1777-17T3
    42
    Third, the Guidance Document appears intended to act prospectively to all
    certification and yearly recertification applications of certified measurement
    businesses. 
    Ibid.
     Fourth, the Guidance Document prescribes requirements that,
    while potentially valid if enacted through rulemaking, are not "clearly and
    obviously inferable" from the RPA's grant of power to the DEP to create a
    system of certification of businesses and persons conducting radon testing. 
    Ibid.
    The fifth Metromedia factor is not as clear in its application because, except for
    the school requirements, the Guidance Document is not flatly contrary to
    requirements expressed in the regulations. 
    Ibid.
     Nevertheless, the Guidance
    Document goes beyond the regulations in the mandates it conveys. 12 Finally,
    the binding nature of the Guidance Document "reflects a decision on
    administrative regulatory policy in the nature of the interpretation of law or
    general policy." 
    Id. at 331-32
    .
    3. The Impact of the Agency's Metromedia Violations on This Case
    Our legal determinations that DEP deviated from the APA and
    Metromedia by its failure to promulgate valid rules concerning its "affiliate
    liability" policy, and with respect to certain portions of its QA/QC Guidance
    12
    We recognize certain portions of the Guidance Document appear to relate
    back to federal standards imposed by the EPA.
    A-1777-17T3
    43
    Document does not mean that all of the measurement-related violations found
    against RDI in this case must be vacated. Some of the violations are unaffected
    by the Metromedia issue. In particular, certain violations relating to RDI's
    measurement functions do not depend on vicarious liability for the licensure
    status or activities of "affiliate" technicians, and may well be within RDI's
    realistic ability to control through the work of its own employees. RDI should
    not, for example, be certifying to the DEP and property owners that radon results
    are accurate if it knows, or has sufficient reason to know, those results are
    flawed. Moreover, as we note, infra, some of the violations adjudicated in the
    administrative case have nothing to do with "affiliate" liability or the QA/QC
    plan, such as the violations concerning mitigation-related inspections, and the
    sale of alpha track testing devices.
    As to the enumerated violations concerning RDI's QA/QC plan, we do not
    set them aside wholesale because of the Metromedia problems.           Rather, a
    violation-by-violation analysis is necessary, tied to whether the specified
    QA/QC violation is reasonably based on a fair application of the express terms
    of a particular regulation rather than comprising a mandate founded upon the
    unpromulgated language of the Guidance Document.
    A-1777-17T3
    44
    Given the highly technical features of these subject matters, we are not in
    the best position to perform a comprehensive violation-specific assessment in
    the first instance. Although we recognize the considerable time and expense the
    agency and RDI have already incurred in this administrative litigation, and the
    efforts devoted by the two ALJs who presided over the lengthy hearings, we
    conclude it preferable for this matter to be remanded to the OAL for further
    proceedings in light of our Metromedia holdings.
    As a predicate to the remand, and as an aid to the ALJ who will preside
    over the remand proceedings, we direct the DEP to make a proffer to RDI within
    forty-five days of this opinion as to which specific proven measurement
    violations the DEP believes are unaffected by our Metromedia nullification, and
    which ones are not. Indeed, at oral argument on appeal, the DEP's counsel
    acknowledged that certain violations would need to be set aside in the
    hypothetical event we were to conclude the agency's affiliate liability policy and
    QA/QC Guidance Document had infirmities under Metromedia. RDI shall
    respond to the DEP's proffer within thirty days, and the matter should then be
    promptly scheduled for a case management conference before an ALJ.
    On remand, the ALJ shall have discretion to hear additional testimony
    germane to the issues, including: (1) the impact, if any, of our Metromedia ruling
    A-1777-17T3
    45
    on specific violations; and (2) RDI's contention that certain violations are
    founded upon a mistaken premise that it is possible and feasible for RDI to
    control the acts of third parties that may underlie the claimed violation. The
    ALJ on remand should also address in more detail RDI's arguments that certain
    alleged "measurement" violations instead supplant the separate regulations
    governing RDI's laboratory activities.
    Upon completion of the ALJ's remanded findings, either party may file
    timely exemptions with the Commissioner and, thereafter, a new appeal may be
    filed with this court arising from the new final agency decision.
    We further note that our decision to remand this matter does not require
    the OAL or the agency to reconsider credibility findings on factual matters
    already addressed by the second ALJ in her comprehensive written decision.
    We reject RDI's argument that those credibility findings on factual issues should
    be set aside. Those findings are entitled to our deference and are supported by
    substantial credible evidence in the record. See H.K. v. State, 
    184 N.J. 367
    , 384
    (2005).   They need not be revisited. Of course, any new relevant factual
    testimony adduced at the remand proceeding will need to be evaluated by the
    ALJ for its credibility and probative worth.
    A-1777-17T3
    46
    In sum, we hold the DEP's "affiliate" position is invalid under
    Metromedia, and that those portions of its QA/QC Guidance Document that are
    not expressed or fairly inferable from the published regulations are likewise not
    a proper basis for enforcement. We remand for a further violation-by-violation
    assessment in light of our ruling, as well as a more in-depth evaluation of RDI's
    contentions of impossibility and impracticability of performance relating to the
    activities of persons it does not employ, compensate, or control. More broadly,
    we also urge the DEP to engage in prospective rulemaking in compliance with
    the APA with respect to both its "affiliate" policy and QA/QC plans, so that the
    published regulations accurately set forth the applicable standards to the public
    and the regulated community.
    III.
    Lastly, we address the findings of violations by RDI that do not concern
    its measurement functions, i.e., those involving radon mitigation and its sales of
    radon detection devices.     Upon reviewing the extensive record developed
    concerning those particular violations, and the meticulous determinations of the
    ALJs as upheld by the Commissioner, we are satisfied those findings are amply
    supported by credible proof in the record and are neither arbitrary nor capricious.
    Applying our limited scope of appellate review, we affirm those findings,
    A-1777-17T3
    47
    substantially for the sound reasons expressed in the respective ALJ decisions
    and in the Commissioner's final decision. RDI's arguments seeking to set aside
    those determinations lack sufficient merit to warrant discussion here. R. 2:11-
    3(e)(1)(D) and (E). Nonetheless, we add a few brief comments.
    We are persuaded by the proof of RDI's nine violations of N.J.A.C. 7:28-
    27.7(c), which requires certified radon mitigation businesses to "assure that
    radon mitigation system installations are performed under the direct supervision
    of a certified radon mitigation specialist or certified radon mitigation
    technician." We agree with the agency that the term "directly supervise," as
    expressed in the regulation, logically and reasonably requires the physical
    presence of a specialist or technician to oversee the installations. Requiring
    such physical presence is consistent with the overall objectives of public safety
    reflected in the RPA. The requirement is neither arbitrary nor capricious. In
    addition, we note and defer to the second ALJ's finding that RDI's contrary
    interpretation was advanced by a witness who the ALJ found less credible than
    the DEP's witnesses.
    We likewise uphold the DEP's determination that RDI violated N.J.A.C.
    7:28-27.7(d), which requires mitigation specialists to "perform a visual
    inspection and diagnostic tests, as appropriate, prior to system installation to
    A-1777-17T3
    48
    determine the appropriate mitigation system to be installed." The specialist also
    must document the observations and test results from these inspections.
    N.J.A.C. 7:28-27.7(d). The record shows that in, at least two instances, RDI
    permitted mitigation systems to be installed by a mitigation technician without
    "appropriate" visual inspection by a mitigation specialist. The agency has
    reasonably rejected RDI's asserted justification that the individual deployed to
    the buildings in question was merely acting as a "salesman," and was only
    gathering data for an off-site mitigation specialist to evaluate.
    Although the regulations do envision a degree of discretion by the
    specialist in choosing what, if any, mitigation systems are "appropriate" for a
    particular building, see 22 N.J.R. at 3521, the agency acted within its regulatory
    prerogatives to disapprove of the manner in which RDI handled the cited
    situations. Likewise, we upheld the determination of the DEP and the second
    ALJ that RDI's use of "stock drawings" of mitigation systems was an
    unacceptable practice.
    RDI was also appropriately held liable for having two uncertified persons
    conduct an initial on-site inspection of a mitigation project and install mitigation
    systems. This is a proven violation of N.J.A.C. 7:28-27.7(d) and -27.3(e), and
    supported by the evidence in the record.
    A-1777-17T3
    49
    Finally, we note the record adequately supports the findings of both ALJs
    and the agency with respect to RDI's multiple sales of "Alpha Track" testing
    systems without proper certification to sell those items. See N.J.A.C. 7:28-
    27.3(d). The agency reasonably rejected RDI's reliance upon an exemption that
    only applies to businesses such as hardware stores that, unlike RDI, are retail
    outlets not certified radon measurement businesses.            See N.J.A.C. 7:28-
    27.31(a)(4).    Given that RDI is, and holds itself out as, a certified radon
    measurement business, it is reasonable that customers would expect that RDI
    had certification and expertise in all of the products it sells, as contrasted with a
    mere retail store.
    In sum, we affirm all of the non-measurement violations, which now may
    be the subject of a penalty enforcement action.
    IV.
    For all of the foregoing reasons, we affirm the DEP Commissioner's final
    agency decision in part and reverse and remand it in part for additional
    administrative proceedings. The DEP is also urged to engage in prospective
    rulemaking as mandated by the APA and Metromedia.                We do not retain
    jurisdiction.
    A-1777-17T3
    50