Hull, J.
The defendants Connecticut Resources Recovery Authority, Southeastern Connecticut Regional Resources Recovery Authority1 and American Ref-Fuel Company (the defendants)2 filed applications with the defendant Connecticut department of environmental protection (DEP) for three permits necessary to construct a proposed resources recovery [823]*823facility3 (the facility) in the plaintiff town of Preston. See General Statutes § 22a-208a (solid waste construction permit); § 22a-174 (c) (air emissions permit); § 22a-430 (a) (water discharge permit).4 Pursuant to [824]*824General Statutes § 22a-19 (a),5 the plaintiffs, the town of Preston, Citizens for Alternatives to the Incineration of Refuse, the Mohegan Indian Tribe and Nation, John E. Hamilton and Eleanor C. Fortin, intervened as parties in the administrative proceeding. Following public hearings, the commissioner of environmental protection (the commissioner) granted the defendants’ applications for a solid waste construction permit and an air emissions permit.6 The plaintiffs appealed to the Superior Court, which dismissed the appeal on its merits. The plaintiffs thereafter appealed to the Appellate Court and we transferred the appeal to this court pursuant to Practice Book § 4023. We affirm.
The plaintiffs claim that the trial court should have concluded that the commissioner improperly granted the defendants’ applications for a solid waste construction permit and an air emissions permit.
I
The plaintiffs first claim that the trial court should have concluded that the defendants’ application for a solid waste construction permit was improperly granted by the commissioner. According to the plaintiffs, [825]*825because the application was incomplete, the commissioner was prohibited from granting it. The plaintiffs also argue that because the defendants failed to demonstrate that a parent company of the defendant Ref-Fuel, Browning-Ferris Industries, Inc. (BFI), had not repeatedly violated pertinent statutes, the application should have been denied.
A
We first address the plaintiffs’ assertion that the defendants’ application for a solid waste construction permit was incomplete and that, therefore, the commissioner was precluded from granting it. According to the plaintiffs, § 22a-209-4 (b) of the Regulations of Connecticut State Agencies,7 requires that specific [826]*826information be included in every application for a solid waste construction permit and that, therefore, the absence of certain of this information from the defend[827]*827ants’ application rendered the application incomplete and precluded issuance of a solid waste permit.8 We do not agree.
Section 22a-209-4 (b) provides in pertinent part: “The information required to be in an application for a permit to construct shall depend upon the type of solid waste facility proposed. . . . An application will not be deemed complete until all information required by statutes or regulations or otherwise requested by the Commissioner have [sic] been submitted in proper form. [828]*828(1) Application for each solid waste facility permit to construct . . . shall include but not be limited to the following as the Commissioner deems necessary . . . (Emphasis added.) This language is followed by a comprehensive list of items that relate to all solid waste facilities. Section 22a-209-4 (b) thereafter provides: “(2) A facility plan, including engineering studies and proposals, shall accompany the application . . . and shall include but not be limited to the following information and supporting materials as the Commissioner deems necessary . . . (Emphasis added.) This language is followed by two specific lists of items. The first applies to “solid and special waste disposal areas,” while the second applies to “transfer stations, resources recovery facilities or other volume reduction plants, and biomedical waste treatment facilities.” Regs., Conn. State Agencies § 22a-209-4 (b) (2) (A) and (B).
The plaintiffs argue that use of the phrase “shall include” in the prefatory language of § 22a-209-4 (b) (1) and (2) requires that every application for a solid waste construction permit include each item set forth in § 22a-209-4 (b) (1) and, if applicable, each item set forth in § 22a-209-4 (b) (2) (A) or (B). It is quite plausible, however, that the phrase “as the Commissioner deems necessary” modifies “shall include” and that, therefore, an application for a solid waste construction permit “shall include” the information set forth only if the commissioner deems it necessary. Nevertheless, the plaintiffs maintain that the phrase “as the Commissioner deems necessary” modifies only the phrase “but not be limited to the following” and that, therefore, any discretion that the phrase imparts to the commissioner is restricted to determining whether an application will be limited to the information set forth in the regulation.
Because § 22a-209-4 (b) is subject to two plausible interpretations, it requires our construction. As is true [829]*829in every case involving the construction of a statute, our starting point must be the language employed.9 King v. Board of Education, 203 Conn. 324, 332, 524 A.2d 1131 (1987); Verdon v. Transamerica Ins. Co., 187 Conn. 363, 366, 446 A.2d 3 (1982). “The test for determining whether the use of the word ‘shall’ is mandatory or directory is ‘whether the prescribed mode of action is of the essence of the thing to be accomplished.’ Vartuli v. Sotire, 192 Conn. 353, 360, 472 A.2d 336 (1984). That test must be applied with reference to the purpose of the statute. See id.” LeConche v. Elligers, 215 Conn. 701, 710, 579 A.2d 1 (1990).
General Statutes § 22a-208a (a), part of the legislative scheme that § 22a-209-4 was designed to implement; see General Statutes § 22a-209; provides: “The commissioner of environmental protection may issue, deny, modify, renew, suspend, revoke or transfer a permit, under such conditions as he may prescribe and upon submission of such information as he may require, for the construction, alteration and operation of solid waste facilities, in accordance with the provisions of this chapter and regulations adopted pursuant to this chapter.” (Emphasis added.) The legislature intended, therefore, that the decision of what information must be included in a solid waste construction permit application is, ultimately, a matter within the commissioner’s discretion.
Furthermore, by rendering a decision on the defendants’ application, despite the fact that the application did not include every item of information set forth in the regulation, the commissioner implicitly interpreted [830]*830§ 22a-209-4 (b) as requiring the application for a solid waste construction permit to include only the information that he deemed necessary.
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Hull, J.
The defendants Connecticut Resources Recovery Authority, Southeastern Connecticut Regional Resources Recovery Authority1 and American Ref-Fuel Company (the defendants)2 filed applications with the defendant Connecticut department of environmental protection (DEP) for three permits necessary to construct a proposed resources recovery [823]*823facility3 (the facility) in the plaintiff town of Preston. See General Statutes § 22a-208a (solid waste construction permit); § 22a-174 (c) (air emissions permit); § 22a-430 (a) (water discharge permit).4 Pursuant to [824]*824General Statutes § 22a-19 (a),5 the plaintiffs, the town of Preston, Citizens for Alternatives to the Incineration of Refuse, the Mohegan Indian Tribe and Nation, John E. Hamilton and Eleanor C. Fortin, intervened as parties in the administrative proceeding. Following public hearings, the commissioner of environmental protection (the commissioner) granted the defendants’ applications for a solid waste construction permit and an air emissions permit.6 The plaintiffs appealed to the Superior Court, which dismissed the appeal on its merits. The plaintiffs thereafter appealed to the Appellate Court and we transferred the appeal to this court pursuant to Practice Book § 4023. We affirm.
The plaintiffs claim that the trial court should have concluded that the commissioner improperly granted the defendants’ applications for a solid waste construction permit and an air emissions permit.
I
The plaintiffs first claim that the trial court should have concluded that the defendants’ application for a solid waste construction permit was improperly granted by the commissioner. According to the plaintiffs, [825]*825because the application was incomplete, the commissioner was prohibited from granting it. The plaintiffs also argue that because the defendants failed to demonstrate that a parent company of the defendant Ref-Fuel, Browning-Ferris Industries, Inc. (BFI), had not repeatedly violated pertinent statutes, the application should have been denied.
A
We first address the plaintiffs’ assertion that the defendants’ application for a solid waste construction permit was incomplete and that, therefore, the commissioner was precluded from granting it. According to the plaintiffs, § 22a-209-4 (b) of the Regulations of Connecticut State Agencies,7 requires that specific [826]*826information be included in every application for a solid waste construction permit and that, therefore, the absence of certain of this information from the defend[827]*827ants’ application rendered the application incomplete and precluded issuance of a solid waste permit.8 We do not agree.
Section 22a-209-4 (b) provides in pertinent part: “The information required to be in an application for a permit to construct shall depend upon the type of solid waste facility proposed. . . . An application will not be deemed complete until all information required by statutes or regulations or otherwise requested by the Commissioner have [sic] been submitted in proper form. [828]*828(1) Application for each solid waste facility permit to construct . . . shall include but not be limited to the following as the Commissioner deems necessary . . . (Emphasis added.) This language is followed by a comprehensive list of items that relate to all solid waste facilities. Section 22a-209-4 (b) thereafter provides: “(2) A facility plan, including engineering studies and proposals, shall accompany the application . . . and shall include but not be limited to the following information and supporting materials as the Commissioner deems necessary . . . (Emphasis added.) This language is followed by two specific lists of items. The first applies to “solid and special waste disposal areas,” while the second applies to “transfer stations, resources recovery facilities or other volume reduction plants, and biomedical waste treatment facilities.” Regs., Conn. State Agencies § 22a-209-4 (b) (2) (A) and (B).
The plaintiffs argue that use of the phrase “shall include” in the prefatory language of § 22a-209-4 (b) (1) and (2) requires that every application for a solid waste construction permit include each item set forth in § 22a-209-4 (b) (1) and, if applicable, each item set forth in § 22a-209-4 (b) (2) (A) or (B). It is quite plausible, however, that the phrase “as the Commissioner deems necessary” modifies “shall include” and that, therefore, an application for a solid waste construction permit “shall include” the information set forth only if the commissioner deems it necessary. Nevertheless, the plaintiffs maintain that the phrase “as the Commissioner deems necessary” modifies only the phrase “but not be limited to the following” and that, therefore, any discretion that the phrase imparts to the commissioner is restricted to determining whether an application will be limited to the information set forth in the regulation.
Because § 22a-209-4 (b) is subject to two plausible interpretations, it requires our construction. As is true [829]*829in every case involving the construction of a statute, our starting point must be the language employed.9 King v. Board of Education, 203 Conn. 324, 332, 524 A.2d 1131 (1987); Verdon v. Transamerica Ins. Co., 187 Conn. 363, 366, 446 A.2d 3 (1982). “The test for determining whether the use of the word ‘shall’ is mandatory or directory is ‘whether the prescribed mode of action is of the essence of the thing to be accomplished.’ Vartuli v. Sotire, 192 Conn. 353, 360, 472 A.2d 336 (1984). That test must be applied with reference to the purpose of the statute. See id.” LeConche v. Elligers, 215 Conn. 701, 710, 579 A.2d 1 (1990).
General Statutes § 22a-208a (a), part of the legislative scheme that § 22a-209-4 was designed to implement; see General Statutes § 22a-209; provides: “The commissioner of environmental protection may issue, deny, modify, renew, suspend, revoke or transfer a permit, under such conditions as he may prescribe and upon submission of such information as he may require, for the construction, alteration and operation of solid waste facilities, in accordance with the provisions of this chapter and regulations adopted pursuant to this chapter.” (Emphasis added.) The legislature intended, therefore, that the decision of what information must be included in a solid waste construction permit application is, ultimately, a matter within the commissioner’s discretion.
Furthermore, by rendering a decision on the defendants’ application, despite the fact that the application did not include every item of information set forth in the regulation, the commissioner implicitly interpreted [830]*830§ 22a-209-4 (b) as requiring the application for a solid waste construction permit to include only the information that he deemed necessary. We accord great deference to the construction of a provision given by the administrative agency charged with the provision’s enforcement. Trumbull v. State, 206 Conn. 65, 77, 537 A.2d 431 (1988); Phelps Dodge Copper Products Co. v. Groppo, 204 Conn. 122, 128-29, 527 A.2d 672 (1987). “This principle applies with even greater force to an agency’s interpretation of its own duly adopted regulations.” Griffin Hospital v. Commission on Hospitals & Health Care, 200 Conn. 489, 497, 512 A.2d 199, appeal dismissed, 479 U.S. 1023, 107 S. Ct. 781, 93 L. Ed. 2d 819 (1986).
Considering the comprehensiveness of the lists set forth in § 22a-209-4 (b), construction of the section as the plaintiffs suggest would elevate form over substance by requiring the inclusion of information in an application in cases where the commissioner, in his discretion, deems such information either unnecessary or superfluous. “ ‘[Wjhere a statute is capable of two constructions, one that is rational and effective in accomplishing the evident legislative object, and the other leading to “bizarre results” destructive of that purpose, the former should prevail.’ State v. Williams, 206 Conn. 203, 210, 536 A.2d 583 (1988).” State v. Uretek, Inc., 207 Conn. 706, 719, 543 A.2d 709 (1988).
We conclude that, because the purpose of § 22a-209-4 (b) is to ensure that the commissioner has an adequate basis upon which to render a decision on a solid waste construction permit application and because both the legislature and the commissioner have determined that the commissioner is in the best position to decide what information is necessary under the circumstances of each case, the more reasonable inter[831]*831pretation of § 22a-209-4 (b) is that an application thereunder must include only those items set forth that the commissioner deems necessary.
B
The plaintiffs next assert that because the defendants failed to demonstrate that BFI, a parent company of Ref-Fuel, had not repeatedly violated pertinent statutes, their application for a solid waste construction permit should have been denied. We disagree.
Section 22a-209-4 (d) (1) (D) of the Regulations of Connecticut State Agencies provides in pertinent part: “(1) The Commissioner shall issue a permit to construct or to operate upon receipt of satisfactory evidence from the applicant that . . . (D) the owner or operator of the facility or, if the owner or operator is a business entity, a parent or subsidiary corporation . . . has not repeatedly violated pertinent statutes, regulations, orders or permit terms or conditions at any solid waste facility.”
In support of their position, the plaintiffs assert that, pursuant to § 22a-209-4 (d) (1) (D), evidence of the following precluded the commissioner from issuing a solid waste construction permit to the defendants: BFI had been ordered to cease operations and alter its methods of operation at various waste disposal sites. BFI had been the subject of investigation in connection with enforcement actions involving hazardous waste disposal. Administrative proceedings involving the discharge of materials into the environment were pending against BFI. BFI was a named defendant in a pending civil action that alleged price fixing for waste services. After considering this evidence, the commissioner determined that BFI’s compliance history did not warrant denial of the defendants’ application for a solid waste construction permit.
[832]*832In reviewing a decision of an administrative agency, we will reverse the decision upon a showing that the agency acted illegally, arbitrarily or in abuse of its discretion or that the decision is unsupported by the evidence. Connecticut Humane Society v. Freedom of Information Commission, 218 Conn. 757, 762, 591 A.2d 395 (1991); Connecticut Building Wrecking Co. v. Carothers, 218 Conn. 580, 605, 590 A.2d 447 (1991). The determination of whether an applicant has “repeatedly violated pertinent statutes, regulations, orders or permit terms or conditions at any solid waste facility” is a question of fact. We conclude that nothing in the record indicates an abuse of discretion by the commissioner in refusing to find that BFI’s violations had been repeated. We further conclude that the commissioner reasonably determined that evidence of investigations, alleged violations of pertinent statutes and pending proceedings involving BFI, did not require denial of the defendants’ application for a solid waste construction permit.
II
The plaintiffs next claim that the trial court should have concluded that the defendants’ application for an air emissions permit was improperly granted. According to the plaintiffs, because the defendants failed to analyze the particulate matter measuring less than ten microns in diameter that will be emitted by the facility and because they failed properly to analyze the impact that the facility will have on the prevention of significant deterioration of the ambient air quality, then-application should have been denied.
The plaintiffs first assert that the defendants’ failure to analyze the particulate matter measuring less [833]*833than ten microns in diameter (PMi0)10 that will be emitted by the facility required denial of their application for an air emissions permit. We disagree.
Title 40 C.F.R. § 52.21 (i) (1990) provides in pertinent part: “(1) No stationary source ... to which the requirements of paragraphs (j) through (r) of this section apply shall begin actual construction without a permit which states that the stationary source . . . would meet those requirements.” Title 40 C.F.R. § 52.21 (j) (2) (1990) provides: “A new major stationary source shall apply best available control technology for each pollutant subject to regulation under the Act that it would have the potential to emit in significant amounts.”11 The plaintiffs argue that, pursuant to § 52.21 (i), the defendants’ application was required to include an analysis showing that the facility would apply the best available control technology with respect to limiting PM10 emissions and, therefore, meet the requirement of § 52.21 (j) (2). We are unpersuaded.
Title 40 C.F.R. § 52.21 (i) (4) (1990) provides in pertinent part: “The requirements of paragraphs (j) through (r) of this section shall not apply to a particular major stationary source ... if . . . (x) The source . . . was subject to 40 CFR 52.21, with respect to particulate matter, as in effect before July 31,1987 and the owner or operator submitted an application for a permit under this section before that date, and the Administrator [of the environmental protection agency] subsequently determines that the application as submitted was complete with respect to the particulate [834]*834matter requirements then in effect in this section. Instead, the requirements of paragraphs (j) through (r) of this section that were in effect before July 31,1987 shall apply to such source or modification.”
It is undisputed that the facility was subject to 40 C.F.R. § 52.21, with respect to particulate matter, as in effect before July 31, 1987. See 40 C.F.R. § 52.21 (1986). The plaintiffs assert, however, that the defendants failed to submit a complete application for an air emissions permit under § 52.21 prior to July 31,1987. The plaintiffs first argue that because the defendants submitted their application for a permit to the commissioner, rather than to the administrator of the environmental protection agency (the administrator), they failed to submit an application under § 52.21. Because the administrator has delegated authority to enforce the standards of performance for new stationary sources to the commissioner; see Regs., Conn. State Agencies § 22a-174-3 (a) (2) (commissioner has been delegated authority to enforce 40 C.F.R. Part 60 by the administrator); 40 C.F.R. Part 60 (1990) (standards of performance for new stationary sources); this argument is without merit.
The plaintiffs next assert that the defendants’ application was not complete until September 16,1987, and that, therefore, the exemption set forth in § 52.21 (i) (4) (x) does not apply. The commissioner determined that a complete application for an air emissions permit was submitted by the defendants before July 31, 1987. The plaintiffs’ second assertion, therefore, is equally without merit.
Because the defendants submitted a complete application for an air emissions permit prior to July 31,1987, the requirements of 40 C.F.R. § 52.21 (i) and (j) (1990) do not apply to their application for an air emissions permit. Instead, the requirements of 40 C.F.R. § 52.21 (1986), which were the regulations in effect prior to [835]*835July 31, 1987, govern the defendants’ application. 40 C.F.R. § 52.21 (i) (4) (x) (1990). PM10 is not a pollutant subject to regulation under the 1986 regulations. See 40 C.F.R. § 52.21 (b) (23) (i) (1986). We conclude, therefore, that the defendants were not required to conduct an analysis of PM10 emissions in order to obtain an air emissions permit.
The plaintiffs next assert that because the defendants failed to analyze properly the effect that the facility will have on the prevention of significant deterioration of the ambient air quality (PSD),12 their application for an air emissions permit should have been denied. We disagree.
Title 40 C.F.R. § 52.21 (m) (1) (1990) provides in pertinent part: “(i) Any application for a permit under this section shall contain an analysis of ambient air quality in the area that the major stationary source . . . would affect for each of the following pollutants: (a) For the source, each pollutant that it would have the potential to omit in a significant amount . . . .’’The plaintiffs do not dispute that the defendants submitted an analysis of PSD with their application. They assert, however, that, because the defendants’ analysis did not contain all essential data and because some of the data that it included was outdated, inaccurate [836]*836or unverified, the analysis was inadequate. Nevertheless, the plaintiffs have not challenged the commissioner’s conclusion that “[t]he [fjacility will meet all applicable state and federal regulations governing the issuance of permits for a new source of air emissions.”
We conclude that, despite the alleged inadequacy of the defendants’ PSD analysis, because the plaintiffs do not challenge the commissioner’s conclusion that the facility will comply with applicable federal and state regulations governing new stationary sources of air emissions, including regulations designed to ensure PSD, the commissioner properly granted the defendants’ application for an air emissions permit.
The judgment is affirmed.
In this opinion the other justices concurred.