*206*468This case arises from the untimely death of Andres Burgos, who drowned while swimming in Lake McDonough, a recreational area that is owned and operated by the defendant, the Metropolitan District Commission.1 The plaintiff, Vivian Perez, administratrix of the estate of Andres Burgos, appeals from the summary judgment rendered by the trial court in favor of the defendant on the basis of governmental *469immunity. On appeal, the plaintiff claims that the trial court erred in rendering summary judgment because there is a genuine issue of material fact with respect to (1) whether Burgos' death was caused by the defendant's breach of one or more of its ministerial duties, and (2) whether Burgos was an identifiable person subject to imminent harm. We are not persuaded and, accordingly, affirm the judgment of the trial court.
Viewed in the light most favorable to the plaintiff as the nonmoving party, the record reveals the following facts and procedural history. On July 9, 2011, Burgos and a group of friends went to Lake McDonough to swim. The lake is located principally in Barkhamsted, and its perimeter encompasses approximately 10.5 miles. At approximately 4 p.m., the group arrived at West Beach, which was one of three beaches on the lake that the defendant permitted the public to use during the late spring and summer months. Each of these beaches was adjacent to a designated swimming area, the boundaries of which were indicated by a string of red and white buoys. At each beach, the defendant also posted signs, in both English and Spanish, displaying the pertinent rules and regulations, including where swimming was permitted. Additionally, the defendant's employees conducted random boat patrols throughout the lake in order to locate individuals swimming outside of the designated areas.
After arriving at West Beach, Burgos and his friends followed a trail through the woods to an area of the lake colloquially known as "the Point." The group, including Burgos, entered the water from the Point and swam to a small island, referred to as First Island, approximately 250 feet from shore.2 After reaching the island, the group *470started back to the shore. During the return journey, Burgos began to struggle before slipping underwater.
Upon realizing that Burgos had disappeared, members of the group swam to shore and ran back along the trail to West Beach to alert the defendant's lifeguards. Once informed of the incident, several lifeguards ran to the Point, entered the water and began to search for Burgos. Lifeguards from the other nearby beaches, notified over the radio of a possible drowning incident, soon arrived by boat to assist with the ongoing rescue. Despite the relatively close proximity of the island to the shore, the location where the group had been swimming was estimated to be deeper than twenty feet in some places. The depth of the water impaired visibility and forced the defendant's lifeguards to confine their line search to the shallower areas. After searching and not finding Burgos in the shallow sections, some of the lifeguards dove down into the deeper parts *207of the channel. Approximately fifty-five minutes after Burgos was last seen, one of the lifeguards, performing a deep water dive, located him lying faceup on the lakebed. He was retrieved and transported to Hartford Hospital. Burgos was pronounced dead later that day at 5:50 p.m. The cause of death was determined to be asphyxia and drowning.
On May 2, 2013, the plaintiff commenced the present wrongful death action against the defendant. The operative complaint alleged a single count against the defendant predicated on General Statutes § 52-557n (a) (1) (A).3 Specifically, the plaintiff alleged, inter alia, that *471the defendant had a ministerial duty (1) to prevent visitors from accessing and swimming in undesignated areas, (2) to conduct timely boat patrols, (3) to initiate a timely search for Burgos, (4) to contact the police, or call 911, in a timely fashion, and (5) to possess and maintain appropriate rescue equipment, but had failed to perform one or more of these responsibilities, and this nonfeasance was a direct and proximate cause of Burgos' death. On December 29, 2016, the defendant filed a motion for summary judgment on the ground that the plaintiff's claim was barred by the doctrine of governmental immunity pursuant to § 52-557n. In her objection to the motion, the plaintiff argued that the defendant had failed to meet its initial burden of negating the allegations of negligence as framed in the complaint, and, alternatively, that Burgos was an identifiable person subject to imminent harm, thus, creating an exception to governmental immunity.
In its memorandum of decision, dated June 16, 2017, the trial court concluded that the defendant had carried its burden of establishing that no genuine issue of material fact existed and granted the motion for summary judgment on the ground of governmental immunity. The court concluded that the plaintiff had failed to adduce evidence to raise a genuine issue of material fact as to the existence of a ministerial duty or that Burgos was an identifiable person subject to an imminent risk of harm. This appeal followed. Additional facts will be set forth as necessary.
We begin by setting forth the standard of review with respect to an appeal from a trial court's decision to grant a motion for summary judgment. "Practice Book § [17-49] provides that summary judgment shall be rendered forthwith if the pleadings, affidavits and any other proof submitted show that there is no genuine issue as to any material fact and that the moving party is entitled to judgment as a matter of law .... In deciding a *472motion for summary judgment, the trial court must view the evidence in the light most favorable to the nonmoving party .... The party seeking summary judgment has the burden of showing the absence of any genuine issue [of] material facts which, under applicable principles of substantive law, entitle him to a judgment as a matter of law ... and the party opposing such a motion must provide an evidentiary foundation to demonstrate the existence of a genuine issue of material fact .... [I]ssue-finding, rather than issue-determination, is the key to the procedure .... [T]he trial court does not sit as the trier of fact when ruling on a motion for summary judgment .... [Its] function *208is not to decide issues of material fact, but rather to determine whether any such issues exist .... Our review of the decision to grant a motion for summary judgment is plenary .... We therefore must decide whether the court's conclusions were legally and logically correct and find support in the record." (Internal quotation marks omitted.) DiMiceli v. Cheshire , 162 Conn. App. 216, 221-22, 131 A.3d 771 (2016).
I
The plaintiff's first claim is that the court erred in concluding that she had not established a genuine issue of material fact with regard to whether Burgos' death was caused by the defendant's breach of a ministerial duty.4 In support of her argument, the plaintiff primarily relies on the deposition of Marcia Munoz, the individual responsible for safety at Lake McDonough at the time *473of the incident. Munoz testified that she made "a lot of changes" to the defendant's lifeguard policies prior to 2011, but that she could not recall these changes specifically without first referencing a state manual from which the changes were derived. The defendant, however, was unable to produce the state manual, as it was apparently lost at some point after Munoz' retirement. The plaintiff contends on appeal that, without knowing precisely what changes Munoz adopted, a reasonable jury could conclude that her changes created ministerial duties or that her changes were not communicated effectively to those responsible for their implementation.5 Additionally, the plaintiff argues that the defendant's failure to preserve the state manual referenced in Munoz' testimony created a permissible adverse inference that the defendant violated a ministerial duty.
As a threshold matter, we acknowledge that the parties do not dispute that the defendant is a political subdivision and, therefore, entitled to the defense of governmental immunity. "With respect to governmental immunity, under ... § 52-557n, a [political subdivision] may be liable for the negligent act or omission of [its] officer[s] acting within the scope of [their] employment or official duties .... The determining factor is whether the act or omission was ministerial or discretionary .... [Section] 52-557n (a) (2) (B) ... explicitly shields a [political subdivision] from liability for damages to person or property caused by the negligent *474acts or omissions which require the exercise of judgment or discretion as an official function of the authority expressly or impliedly granted by law .... In contrast ... officers [of a political subdivision] are not immune from liability for negligence arising out of *209their ministerial acts, defined as acts to be performed in a prescribed manner without the exercise of judgment or discretion." (Citations omitted; internal quotation marks omitted.) Hull v. Newtown , 327 Conn. 402, 407-408, 174 A.3d 174 (2017).
"[O]fficials [of a political subdivision] are immune from liability for negligence arising out of their discretionary acts in part because of the danger that a more expansive exposure to liability would cramp the exercise of official discretion beyond the limits desirable in our society .... Discretionary act immunity reflects a value judgment that-despite injury to a member of the public-the broader interest in having government officers and employees free to exercise judgment and discretion in their official functions, unhampered by fear of second-guessing and retaliatory lawsuits, outweighs the benefits to be had from imposing liability for that injury .... In contrast, [public officials] are not immune from liability for negligence arising out of their ministerial acts .... This is because society has no analogous interest in permitting [them] to exercise judgment in the performance of ministerial acts." (Internal quotation marks omitted.) Ugrin v. Cheshire , 307 Conn. 364, 390-91, 54 A.3d 532 (2012).
"There is a difference between laws that impose general duties on officials and those that mandate a particular response to specific conditions." Bonington v. Westport , 297 Conn. 297, 308, 999 A.2d 700 (2010). "The hallmark of a discretionary act is that it requires the exercise of judgment .... If by statute or other rule of law the official's duty is clearly ministerial rather *475than discretionary, a cause of action lies for an individual injured from allegedly negligent performance .... [M]inisterial refers to a duty which is to be performed in a prescribed manner without the exercise of judgment or discretion .... [E]vidence of a ministerial duty is provided by an explicit statutory provision, town charter, rule, ordinance or some other written directive." (Citation omitted; emphasis in original; internal quotation marks omitted.) Ventura v. East Haven , 170 Conn. App. 388, 401-402, 154 A.3d 1020, cert. granted, 325 Conn. 905, 156 A.3d 537 (2017).
The plaintiff first argues that Munoz' deposition testimony creates a question of material fact similar to that which was presented in Strycharz v. Cady , 323 Conn. 548, 148 A.3d 1011 (2016). In Strycharz , the plaintiff, a high school student, was injured when he was struck by a car while leaving school grounds to smoke a cigarette across the street. Id., 556-57, 148 A.3d 1011. The incident occurred prior to the start of the school day, when school buses were arriving to drop off students. Id., 556, 148 A.3d 1011. In an action against school officials, the plaintiff alleged, inter alia, that the defendant vice principals were liable in failing to execute their ministerial duty to assign school staff members to bus duty the morning of the incident. Id. 565-66, 148 A.3d 1011. On appeal, our Supreme Court reversed in part the judgment of the trial court granting the defendants' motion for summary judgment. Id. 572-73, 148 A.3d 1011. Our Supreme Court determined that the record did not support the trial court's decision to grant the motion for summary judgment with regard to the vice principals' ministerial duty to assign school staff to bus duty because an issue of fact remained as to whether they had distributed to staff members the roster that identified morning bus duty assignments. Id., 572, 148 A.3d 1011. "After all, a bus duty roster by itself would be useless if it is not distributed to those charged with student supervision, informing them about their respective posts and schedule." Id. 566, 148 A.3d 1011.
*210*476The present case is distinguishable from Strycharz . In Strycharz , it was undisputed that a ministerial duty existed; the issue was whether it had been followed. See id., 554-55, 569-573, 148 A.3d 1011. Here, the plaintiff asks this court to speculate that the changes Munoz enacted created ministerial duties and that these changes were not communicated or implemented. "Although the court must view the inferences to be drawn from the facts in the light most favorable to the party opposing the motion ... a party may not rely on mere speculation or conjecture as to the true nature of the facts to overcome a motion for summary judgment .... A party opposing a motion for summary judgment must substantiate its adverse claim by showing that there is a genuine issue of material fact together with the evidence disclosing the existence of such an issue." (Internal quotation marks omitted.) Tuccio Development, Inc. v. Neumann , 111 Conn. App. 588, 594, 960 A.2d 1071 (2008). The exhibits submitted in support of the defendant's motion for summary judgment clearly established that the policies existing at the time of the incident did not create ministerial duties with respect to preventing or rescuing an individual from drowning in an undesignated swimming area.6 We are not convinced that Munoz' inability to recall changes she made to the safety policies at Lake McDonough is a sufficient basis alone to conclude that there is a material dispute of fact as to this issue.
Alternatively, the plaintiff claims that, on the basis of the defendant's failure to preserve the state manual that Munoz used to amend the policies at Lake McDonough, she is entitled to an adverse inference that the *477defendant violated a ministerial duty, which in turn establishes a dispute of material fact as to this issue. Although the plaintiff does not cite any authority, nor are we aware of any, for the claim that a permissive adverse inference predicated on a party's intentional spoliation of evidence can serve to raise a genuine issue of material fact for the purposes of defeating summary judgment, we will nevertheless address the merits of this contention.
As first recognized in Beers v. Bayliner Marine Corp. , 236 Conn. 769, 777-79, 675 A.2d 829 (1996), "[a]n adverse inference may be drawn against a party who has destroyed evidence only if the trier of fact is satisfied that the party who seeks the adverse inference has proven the following. First, the spoliation must have been intentional .... [There need not have been] an intent to perpetrate a fraud by the party or his agent who destroyed the evidence but, rather ... the evidence [must have] been disposed of intentionally and not merely destroyed inadvertently ....
"Second, the destroyed evidence must be relevant to the issue or matter for which the party seeks the inference .... Third, the party who seeks the inference must have acted with due diligence with respect to the spoliated evidence .... Finally ... the trier of fact ... is not required to draw the inference that the destroyed evidence would be unfavorable but ... it may do so upon being satisfied that the above conditions have been met." (Internal quotation marks omitted.)
*211Surrells v. Belinkie , 95 Conn. App. 764, 770-71, 898 A.2d 232, 236 (2006). "Pursuant to Beers, a party suffering from spoliation cannot build an underlying case on the spoliation inference alone; for an underlying claim to be actionable, the [party] must also possess some concrete evidence that will support the underlying claim." (Internal quotation marks omitted.)
*478Rizzuto v. Davidson Ladders, Inc. , 280 Conn. 225, 238, 905 A.2d 1165 (2006).7 Accordingly, in the context of summary judgment, a plaintiff cannot displace the evidentiary foundation necessary to raise a genuine issue of material fact with the mere supposition that an adverse inference will be instructed at trial. Cf. id. ("a plaintiff in a product liability action cannot rely solely on the spoliation inference to withstand a motion for summary judgment or a motion for a directed verdict; he must also have some independent concrete evidence of a product defect"). As the plaintiff here has failed to adduce any evidence to support the existence of a ministerial duty in conjunction with her claim for an adverse inference, the trial court properly concluded that there was no dispute of material fact as to this issue.
II
The plaintiff's second claim is that Burgos was an identifiable person subject to an imminent risk of harm and that, therefore, there is a genuine issue of material fact as to whether the defense of governmental immunity applies. Specifically, the plaintiff argues that Burgos was an identifiable victim because he was among a *479group of specific individuals in an area of Lake McDonough where the defendant, through its employees, arguably knew unpermitted swimming frequently occurred. We disagree.
As we noted previously in this opinion, "governmental immunity precludes liability regardless of whether the duty is public or private as long as the act complained of is discretionary in nature and none of the three recognized exceptions8 to discretionary act immunity applies." (Footnote added.) Violano v. Fernandez , 280 Conn. 310, 332, 907 A.2d 1188 (2006). One of these exceptions, which our Supreme Court describes as "very limited," arises "when the circumstances make it apparent to [a public official] that his or her failure to act would be likely to subject an identifiable person to imminent harm .... By its own terms, this test requires three things: (1) an imminent harm; (2) an identifiable victim; and (3) a public official to whom it is apparent that his or her *212conduct is likely to subject that victim to that harm .... If the [plaintiff] fail[s] to establish any one of the three prongs, this failure will be fatal to [her] claim that [she] come[s] within the imminent harm exception."9 (Internal quotation marks omitted.) Brooks v. Powers , 328 Conn. 256, 265-66, 178 A.3d 366 (2018). Because we conclude that Burgos was not an identifiable victim and/or within a class of identifiable victims, we further conclude that the exception does not apply.
"With respect to the identifiable victim element, we note that this exception applies not only to identifiable *480individuals but also to narrowly defined identified classes of foreseeable victims .... [W]hether a particular plaintiff comes within a cognizable class of foreseeable victims for purposes of this narrowly drawn exception to qualified immunity ultimately is a question of law for the courts, in that it is in effect a question of whether to impose a duty of care .... In delineating the scope of a foreseeable class of victims exception to governmental immunity, our courts have considered numerous criteria, including the imminency of any potential harm, the likelihood that harm will result from a failure to act with reasonable care, and the identifiability of the particular victim .... Other courts, in carving out similar exceptions to their respective doctrines of governmental immunity, have also considered whether the legislature specifically designated an identifiable subclass as the intended beneficiaries of certain acts ... whether the relationship was of a voluntary nature ... the seriousness of the injury threatened ... the duration of the threat of injury ... and whether the persons at risk had the opportunity to protect themselves from harm." (Internal quotation marks omitted.) Grady v. Somers , 294 Conn. 324, 350-51, 984 A.2d 684 (2009). "The only identifiable class of foreseeable victims that we have recognized for these purposes is that of school children attending public schools during school hours." Durrant v. Board of Education , 284 Conn. 91, 107, 931 A.2d 859, 869 (2007) ; see also Jahn v. Board of Education , 152 Conn. App. 652, 668-69, 99 A.3d 1230 (2014) (declining to expand class of identifiable victims to include students participating in after school athletic competition).
In support of her argument, the plaintiff relies on Sestito v. Groton , 178 Conn. 520, 528, 423 A.2d 165 (1979), "the case that created the identifiable person, imminent harm exception as we know it." Haynes v. Middletown , 314 Conn. 303, 333, 101 A.3d 249 (2014)
*481(Eveleigh, J. , concurring). In Sestito , the plaintiff brought an action against the defendant municipality on behalf of the estate of an individual who had been shot and killed outside a bar. Sestito v. Groton , supra, 521-23, 423 A.2d 165. Prior to the shooting, a police officer employed by the defendant had been patrolling the area in his car and observed a group of men gathered in a parking lot near the bar. Id., 522, 423 A.2d 165. While observing the men, he witnessed an altercation begin between two of them that eventually devolved into a physical fight. Id., 523, 423 A.2d 165. Instead of intervening, the officer waited until one of the men was shot before he "drove over and arrested the assailant." Id. On appeal, our Supreme *213Court concluded, without describing the decedent as an identifiable victim,10 that there was a question of fact as to whether the defendant's police officer owed a legal duty to the decedent to prevent the shooting from occurring. Id., 527-28, 423 A.2d 165.
The plaintiff submits that, just as the decedent in Sestito was identifiable despite the police officer not knowing who among the group of men would be shot, Burgos was identifiable because he was among a group of people swimming in Lake McDonough, any of whom could have fatigued suddenly and slipped underwater. The salient difference between the present case and Sestito , however, is that there is no evidence that any of the defendant's employees saw Burgos, or any member of his group, in the undesignated swimming area prior to the incident.11 In the absence of some evidence *482that a person either was individually identifiable to a public official or among a class of identifiable victims, which our precedent limits to school children attending public school during school hours; see Durrant v. Board of Education , supra, 284 Conn. at 107, 931 A.2d 859 ; the first prong of the exception to governmental immunity cannot be satisfied.
Indeed, the present case is analogous to Evon v. Andrews , 211 Conn. 501, 559 A.2d 1131 (1989), in which our Supreme Court "concluded that the imminent harm exception did not apply to the plaintiffs' decedents who were killed in an apartment house fire. Specifically, [the] court determined that [t]he class of possible victims of an unspecified fire that may occur at some unspecified time in the future is by no means a group of identifiable persons ...." (Internal quotation marks omitted.) Violano v. Fernandez , supra, 280 Conn. at 330, 907 A.2d 1188. Similarly, we conclude that a group of individuals in an undesignated swimming area, whose presence is unknown to the defendant, cannot be deemed identifiable for the purposes of the identifiable person, imminent harm exception. Accordingly, there is no genuine issue of material fact as to whether the plaintiff's claim is barred by the doctrine of governmental immunity.
The judgment is affirmed.
In this opinion the other judges concurred.