Court Opinion

ID: 9404258
Source: CourtListenerOpinion
Date Created: 2023-06-22 17:04:27.85089+00
Date Added: 2024-06-11T17:20:12.689256
License: Public Domain

IN THE SUPREME COURT OF THE STATE OF DELAWARE

STATE OF DELAWARE, ex rel.                   §
KATHLEEN JENNINGS, Attorney                  §
General of the State of Delaware,            §      No. 279, 2022
                                             §
       Plaintiff Below,                      §      Court Below: Superior Court
       Appellant,                            §      of the State of Delaware
                                             §
       v.                                    §      C.A. No. N21C-09-179
                                             §
MONSANTO COMPANY,                            §
SOLUTIA, INC., and                           §
PHARMACIA LLC,                               §
                                             §
       Defendants Below,                     §
       Appellees.                            §

                             Submitted: March 29, 2023
                             Decided:   June 22, 2023

Before SEITZ, Chief Justice; VALIHURA, VAUGHN and TRAYNOR, Justices;
MCCORMICK, Chancellor,1 constituting the Court en Banc.

Upon appeal from the Superior Court. AFFIRMED IN PART AND REVERSED
IN PART.

Ralph K. Durstein III, Esquire (argued), Christian Douglas Wright, Esquire,
DELAWARE DEPARTMENT OF JUSTICE, Wilmington, Delaware; Alison S.
Gaffney, Esquire, Daniel Mensher, Esquire, KELLER ROHRBACK L.L.P., Seattle,
Washington; Keil Mueller, Esquire, Steven C. Berman, Esquire, STOLL STOLL
BERNE LOKTING & SHLACHTER P.C., Portland, Oregon, for Plaintiff Below,
Appellant State of Delaware.

Christian J. Singewald, Esquire, Timothy S. Martin, Esquire, Daryll Hawthorne-
Searight, Esquire, WHITE AND WILLIAMS LLP, Wilmington, Delaware; Kim

1
 Sitting by designation under Del. Const. art. IV, § 12 and Supreme Court Rules 2(a) and 4(a) to
complete the quorum.
Kocher, Esquire (argued), Thomas M. Goutman, Esquire, David S. Haase, Esquire,
SHOOK, HARDY & BACON L.L.P., Philadelphia, Pennsylvania, for Defendants
Below, Appellees Monsanto Company, Solutia, Inc., and Pharmacia LLC.

Kenneth T. Kristl, Esquire, WIDENER UNIVERSITY DELAWARE LAW
SCHOOL, Wilmington, Delaware as Amici Curiae Legal Scholars, in support of
Appellant.

Richard L. Renck, Esquire, Mackenzie Wrobel, Esquire, Michael Gonen, Esquire,
DUANE MORRIS LLP, Wilmington, Delaware; Robert M. Palumbos, Esquire,
DUANE MORRIS LLP, Philadelphia, Pennsylvania; Jonathan Urick, Esquire, U.S.
CHAMBERS OF COMMERCE, Washington, D.C., as Amici Curiae the Chamber
of Commerce of the United States of America, the American Tort Reform
Association, and the American Coatings Association in support of Appellees.

Anne M. Steadman, Esquire, REED SMITH LLP, Wilmington, Delaware; James C.
Martin, Esquire, REED SMITH LLP, Pittsburgh, Pennsylvania, as Amicus Curiae
The Product Liability Advisory Council in support of Appellee.

                                      2
SEITZ, Chief Justice:

      According to the allegations of the complaint, for over forty years, Monsanto

was the only U.S. manufacturer of polychlorinated biphenyls, or “PCBs.” PCBs are

forever chemicals that, when released into the environment, persist indefinitely.

PCB exposure has been linked to many serious health effects, so much so that the

federal government in 1977 banned PCB production. The federal government and

the states have spent enormous sums cleaning up PCB environmental contamination.

The State of Delaware is no exception.

      The State alleged that Monsanto knew that the PCBs it produced and sold to

industry and to consumers would eventually be released into the environment and

would cause lasting damage to public health and the State’s lands and waters. The

State brought this action to hold Monsanto responsible for its cleanup costs. It

asserted claims for public nuisance, trespass, and unjust enrichment.

      The Superior Court dismissed the complaint. The trial court reasoned that,

even though the State alleged that Monsanto knew for decades that PCBs were toxic

and would contaminate the environment for generations, the State could not assert a

public nuisance claim or trespass claim because Monsanto manufactured PCB

products, which entered the environment after sale to third parties. The court also

found that the State did not have standing to bring a trespass claim because it held

public lands in trust rather than outright and therefore did not have the exclusive

                                         3
possession of land needed to assert a trespass claim. And the court held that the

Superior Court lacked subject matter jurisdiction to hear the unjust enrichment claim

as a standalone claim. It also concluded that the State could not use an unjust

enrichment claim to recover future cleanup costs.

      On appeal, the State argues that there is no product-based exclusion or control

element of a public nuisance or trespass claim. According to the State, it is enough

to allege that Monsanto substantially contributed to causing the public nuisance and

trespass by selling PCBs to others knowing their end use would cause widespread

and lasting environmental contamination. In addition, for its trespass claim, the

State contends that it has exclusive possession of lands it owns directly and of lands

it holds in trust and thus has standing to assert the claim. Finally, the State argues

that it need not demonstrate the lack of a remedy at law for the Superior Court to

have jurisdiction to hear its unjust enrichment claim, and it sufficiently alleged how

Monsanto has been unjustly enriched.

      The Superior Court held correctly that the State lacks standing to pursue a

trespass claim for land it holds in trust because it does not have exclusive possession

of those lands. And while the Superior Court does have jurisdiction to consider an

unjust enrichment claim, we agree with the court that the State cannot assert the

claim to recover PCB cleanup expenses because Monsanto did not owe a legal duty

independent of its public nuisance and trespass claims.

                                          4
         However, we disagree with several of the Superior Court’s rulings. First,

whether a product is involved, and whether there is control of the product once sold,

are not elements of an environmental-based public nuisance or trespass claim under

Delaware law. For environmental public nuisance and trespass claims, the question

is whether the defendant participated to a substantial extent in carrying out the

activity that created the public nuisance or caused the trespass. Here, the State has

pled sufficiently that, even though Monsanto did not control the PCBs after sale, it

substantially participated in creating the public nuisance and causing the trespass by

actively misleading the public and continuing to supply PCBs to industry and

consumers knowing that PCBs were hazardous, would escape into the environment

after sale to third parties, and would lead to widespread and lasting contamination

of Delaware’s lands and waters. Second, the State alleged that it owns some land

directly – not in trust – and therefore has the exclusive possession of that land needed

to assert a trespass claim. Thus, we affirm in part and reverse in part, and remand

for further proceedings consistent with this opinion.

                                                 I.

                                                A.
         At this stage of the litigation, we accept the well-pled allegations of the

complaint as true.2 In 1929, Swann Research, Inc. began commercial production of

2
    Central Mortg. Co. v. Morgan Stanley Mortg. Capital Hldgs. LLC, 27 A.3d 531, 535 (Del. 2011).
                                                 5
PCBs in the United States.3 Six years later, Monsanto purchased Swann Research.

From 1930 to 1977, Monsanto was the only manufacturer of PCBs for widespread

commercial use in the United States.4

       PCBs are a group of synthetic chemical compounds with unique qualities that

make them useful in commercial products.5 They are fire resistant, minimally water

soluble, chemically stable, and have excellent dielectric properties.6 They can

persist in the natural environment for centuries. But human exposure to PCBs “can

cause serious liver damage, depressed immune system function, skin conditions such

as acne and rashes, significant irritation of and harm to the nose and lungs,

gastrointestinal discomfort, changes in the blood and liver, depression, fatigue, and

learning capacity impairment.”7 In children, PCBs can alter their development, and

exposure can happen prenatally or through breast milk.8         The Environmental

Protection Agency (the “EPA”) declared PCBs as probable carcinogens. PCBs also

have harmful non-carcinogenic effects on the immune, reproductive, nervous, and

endocrine systems of humans.9

3
  App. to Opening Br. at A022 (the complaint).
4
  Id.
5
  Id. at A018-19.
6
  Id. A020.
7
  Id.
8
  Id. at A021.
9
  Id.
                                                 6
       PCBs are harmful to animals, including fish, mammals, pinnipeds, and birds.

In animals, PCBs “accumulate in lipid rich tissues and substances, such as the fatty

tissues of wildlife, birds, fish, and other animal life.”10 One study found a correlation

between PCB exposure and a decline in population and reproduction impairment in

minks and certain bird species.11 Once PCBs enter the environment, they “are

transported through soil, sediment, air, and water,” and humans and animals are

exposed to PCBs through ingestion, inhalation, or direct contact.12

                                           B.

       According to the complaint, Monsanto knew since 1937 about the negative

effects of PCBs. That year, it circulated an internal memorandum that explained the

toxic effects PCBs had on humans and animals.13 Yet, it continued to “develop[],

produce[], and market[] PCBs for use in a wide range of commercial and industrial

applications,” without warning to the public.14 Monsanto manufactured a total of

641,246 metric tons of PCBs in the United States between 1930 and 1977.15

       PCBs “were advertised and predominantly used as components of dielectric

fluids—materials used for electrical insulation—in capacitors, transformers, and

10
   Id. at A020.
11
   Id. at A022.
12
   Id. at A026.
13
   Id. at A027.
14
   Id. at A023.
15
   Id.
                                           7
other electrical systems.”16 PCBs entered the environment through the use in both

open and closed products. In “open applications” – coolants, flame retardants,

plasticizers, paint, etc. – PCBs entered the environment through usage.17 Closed

applications emitted PCBs through “leaks, maintenance, or by volatilizing into the

air.”18

          Monsanto knew as early as the 1950s that PCBs escaped into the

environment.19 In the 1950’s and 60’s, scientists reported on the widespread and

harmful effects of PCBs. But Monsanto “repeatedly misrepresented those facts,

telling consumers, the public, and government entities the exact opposite—that the

compounds were not toxic and that the company would not expect to find PCBs in

the environment in a widespread manner.”20

          In 1947, in response to a customer’s inquiry about the hazards of PCBs,

Monsanto told the customer that Aroclor 1268, one of its PCB products, was almost

non-toxic, “but ‘[t]he vapors of other Aroclors studied are toxic and should be

avoided.’”21 In 1949, it created its own statement regarding the risks of PCBs to

distribute to inquiring clients and customers:

          TOXICITY—Prolonged exposure to AROCLOR vapours will lead to
          systemic toxic effects. However, this is not significant except at high
16
   Id.
17
   Id. at A023-24.
18
   Id. at A024.
19
   Id. at A031.
20
   Id. at A043.
21
   Id. at A028 (alteration in original).
                                            8
        temperatures and then normal draught ventilation will remove any risk.
        [] Acne-form skin eruptions may arise from continued bodily contact
        with liquid AROCLORS, but normal precautions and, if necessary,
        suitable garments provide adequate protection. Toxic effects will
        follow considerable oral ingestion, but this hazard is unlikely to be
        encountered.22
        In March 1969, Monsanto wrote the Los Angeles County Air Pollution

Control District and advised that “the Aroclor compounds ‘are not particularly toxic

by oral ingestion or skin absorption.’”23 Later in that same year, it told the New

Jersey Department of Conservation that “[b]ased on available data, manufacturing

and use experience, we do not believe the PCBs to be seriously toxic.”24 It also tried

to persuade the U.S. Navy to use PCBs in its submarines after the Navy conducted

its own independent research and concluded that PCBs were too dangerous to use.25

        In the 1960s, Monsanto promoted and marketed the use of PCBs in a wide

variety of common household items, although Monsanto tried to distance itself from

the use of PCBs in household items by 1970.26 In a press release Monsanto stated

that “PCB was developed over 40 years ago primarily for use as a coolant in

electrical transformers and capacitors. It is also used in commercial heating and

cooling systems. It is not a ‘household’ item.”27 At the time, however, Monsanto

22
   Id.
23
   Id. at A043.
24
   Id. at A044 (alteration in original).
25
   Id. at A030.
26
   Id. at A042-43.
27
   Id. at A043.
                                           9
was still marketing and selling PCB compounds for use in common household

items.28

       Monsanto’s representations about the relative safety of PCBs were

inconsistent with the evidence in its possession. In 1953, Monsanto’s manager of

environmental health sent an internal memorandum to its chief chemist, noting that

PCBs could not be considered nontoxic. In another internal report two years later,

its chief chemist attached to the report an article that stated that the toxicity of PCBs

had been repeatedly demonstrated.29 Monsanto also ignored its own research in

1966 that “demonstrated the seemingly limitless potential of PCBs for

environmental destruction.”30

       In 1969, when the toxicity evidence became overwhelming, Monsanto

“formed an ‘Aroclor Ad Hoc Committee,’ and tasked that committee with preparing

recommendations for actions that Monsanto could take to improve its reputation and

salvage its bottom line.”31 The committee reported two key findings:

       The committee believes there is little probability that any action that
       can be taken will prevent the growing incrimination of specific
       polychlorinated biphenyls (the higher chlorinated—e.g. Aroclors 1254
       and 1260) as nearly global environmental contaminants leading to
       contamination of human food (particularly fish), the killing of some
       marine species (shrimp), and the possible extinction of several species
       of fish eating birds.

28
   Id.
29
   Id. at A029.
30
   Id. at A034.
31
   Id. at A037.
                                           10
        Secondly, the committee believes that there is no practical course of
        action that can so effectively police the uses of these products as to
        prevent environmental contamination. There are, however, a number
        of actions which must be undertaken to prolong the manufacture, sale
        and use of these particular Aroclors as well as to protect the continued
        use of other members of the Aroclor series.32
        In response to the committee’s findings, in 1970, Monsanto circulated an

interoffice memorandum and updated its previous customer statements from 1947.

In the memorandum, Monsanto acknowledged the harmful effects of PCBs but

reiterated that Monsanto would continue to make PCBs because “[w]e can’t afford

to lose one dollar of business.”33 The memorandum “provided talking points for

[Monsanto’s] employees when discussing the dangers of PCBs with inquiring

customers.”34 Monsanto instructed employees “to avoid any situation where a

customer wants to return fluid.”35 In the year following the Ad Hoc Committee

formation and circulation of the memorandum, Monsanto’s PCB production reached

a company-high of 85 million pounds.36

        Monsanto continued to sell PCBs until 1977, when the federal government

prohibited their manufacture and sale.37

32
   Id. at A038 (emphasis omitted).
33
   Id. at A040 (alteration in original).
34
   Id.
35
   Id.
36
   Id. at A040-41.
37
   Id. at A014.
                                           11
                                               C.

       Even though PCB production ceased in 1977, PCBs continue to contaminate

the natural environment. Delaware in particular has “investigated, monitored, and

detected the presence of PCBs on its lands, in its waters, and in various wildlife

species and other public trust resources within its borders.”38 PCBs have been

detected in the Delaware River, Delaware Bay, Christina River, a variety of

privately-owned contaminated sites located within the State, the Amtrak rail yards,

CitiSteel, Governor Bacon Health Center/Fort DuPont State Park,39 and other State-

owned lands and public trust resources. The State has “develop[ed] innovative

clean-up strategies, including deploying PCB-destroying microorganisms and

adding activated carbon and quicklime to sediments that bind contaminants and limit

their transfer to the water and fish.”40

                                               D.

       Against this backdrop, on September 22, 2021, the State of Delaware became

the latest of many states to file suit against Monsanto to recover damages for harm

38
   Id. A046 (the complaint).
39
   As alleged, the State-owned land is “located on the grounds of a former military base dating
back to the Civil War, which was sold to the State in 1947. Near the health center and the state
park is a former landfill in which PCB-containing materials were deposited. Both state and federal
agencies have undertaken cleanup, with the EPA removing PCB-contaminated soil from the area
and DNREC performing treatment to eliminate hazardous runoff from the site.” Id. at A055.
40
   Id. at A058.
                                               12
suffered due to the manufacturing of PCBs.41 The State asserted three claims –

public nuisance, trespass, and unjust enrichment.

       For its public nuisance claim, the State alleged that the “continuous presence

of PCBs on lands and in waters that the State owns or holds in trust . . . presents

ongoing risks to the health of humans, fish, wildlife, and the environment in the State

of Delaware and constitutes an unreasonable interference with rights common to the

general public.”42 For the trespass claim, it alleged that the presence of PCBs “on

or in waters, land, and other public trust resources of the State interferes with the

State’s interest in the exclusive possession of that property and thereby constitutes a

trespass.”43 It also alleged that Monsanto “had no license or other authorization to

enter onto or leave contaminants on property that the State possesses.”44 For the

unjust enrichment claim, the State alleged that it had incurred significant

investigation, monitoring, and remedial costs in abating the hazard and the risk PCBs

pose to public health and safety.

       For all claims, the State alleged that Monsanto knew as early as 1937 of the

hazardous effects of PCBs in the environment but ignored the evidence and took

41
   Around 1977, Monsanto restructured into three separate entities: Monsanto Company, Solutia,
Inc., and Pharmacia LLC. Monsanto now “operates Original Monsanto’s agricultural products
business.” Id. at A015. Solutia “has assumed all operations, assets, and liabilities of [Original
Monsanto’s chemical products] business.” Id. Pharmacia “operates Original Monsanto’s
pharmaceutical business.” Id.
42
   Id. at A058-59 (the complaint).
43
   Id. at A061.
44
   Id.
                                               13
steps to actively mislead the public. The State sought damages for the harm caused

by PCBs and the cost to abate PCB contamination from its lands, waters, and natural

resources.

                                                E.

         The Superior Court granted Monsanto’s motion to dismiss the complaint.45

The court found that Delaware does not recognize product-based public nuisance

claims, and that Monsanto could not be liable for environmental contamination

under public nuisance and trespass because it did not exercise control over the PCBs

once sold to third parties. For the trespass claim, the court found that the State did

not have standing. As the court reasoned, although the State had regulatory control

over the land and resources, the State does not have exclusive possession of lands

and waters it holds in trust for Delaware citizens. Finally, the court dismissed the

State’s unjust enrichment claim because it lacked jurisdiction to hear unjust

enrichment as a standalone legal claim. It also concluded that an unjust enrichment

claim does not extend to future obligations, which in this case arose after 1977 when

the federal government banned the manufacture and sale of PCBs.

                                                II.

         Nuisance and trespass are related torts. In the land use context, a nuisance

interferes with a plaintiff’s use and enjoyment of property while a trespass interferes

45
     State ex rel. Jennings v. Monsanto Co., 2022 WL 2663220 (Del. Super. July 11, 2022).
                                                14
with a plaintiff’s exclusive possession of property.46 Nuisance is further divided into

private and public nuisance. A private nuisance is, like the name suggests, an

unreasonable interference with a private right.47                A public nuisance is “an

unreasonable interference with a right common to the general public.”48 Nuisance

claims overlap with trespass claims when the trespasser physically enters a property

and, while on the property, engages in activity that affects the possessor’s use and

enjoyment of that property.49

       Monsanto does not challenge the State’s standing to bring a public nuisance

claim for the release of PCBs onto Delaware’s lands and into its waters. Also, it

does not contest the sufficiency of the State’s pleading that the discharge of PCBs

onto Delaware’s lands and into its waters is an unreasonable interference with a right

common to the general public and therefore is a public nuisance. There is no dispute

that these circumstances would be sufficient to support a claim of public nuisance

were it alleged that Monsanto dumped PCBs onto State lands and into State

waterways directly.       But that is not what happened here.               Rather, Monsanto

46
   Page Keeton, Trespass, Nuisance, and Strict Liability, 59 Colum. L. Rev. 457, 464-66 (1959).
47
   Patton v. Simone, 626 A.2d 844, 855 n.8 (Del. Super. 1992) (quoting Restatement (Second) of
Torts § 821D (1979)).
48
   Id. (quoting Restatement (Second) of Torts § 821B).
49
   Restatement (Second) Torts § 821D cmt. e (“[I]nvasion of the possession of land normally
involves some degree of interference with its use and enjoyment and this is true particularly when
some harm is inflicted upon the land itself.”).
                                               15
manufactured PCBs and sold them to third parties before the PCBs entered the

environment.

       Focusing on Monsanto’s status as a manufacturer, the Superior Court held that

Monsanto can avoid addressing the harm caused by its product to a public right

because under Delaware law “product claims are not encompassed within the public

nuisance doctrine,” and “[Monsanto] is not liable for public nuisance unless it

exercises control over the instrumentality that caused the nuisance at the time of the

nuisance.”50 The State responds that the trial court erred in both findings, because

Delaware law does not categorically bar product-based public nuisance claims and

does not impose control as a separate element of a public nuisance claim.

       On appeal we review de novo the Superior Court’s dismissal of a complaint

under Superior Court Civil Rule 12(b)(6).51 Like the Superior Court, the Supreme

Court must accept as true all well-pled factual allegations that provide the opposing

party notice of the claim, draw all reasonable inferences in favor of the plaintiff, and

determine whether the plaintiff would be entitled to recovery “under any reasonably

conceivable set of circumstances.”52

50
   State ex rel. Jennings, 2022 WL 2663220, at *2-*4.
51
   Central Mortg. Co., 27 A.3d at 535.
52
   Id.
                                              16
                                           A.

       Delaware courts have applied the common-sense notion that public nuisance

liability extends not just to those who own the land, but also to those who

substantially participate in creating the public nuisance. For instance, in Keeley v.

Manor Park Apts., Sec. 1, Inc,53 the plaintiff landowner sued for a drainage problem

emanating from an adjoining subdivision.         Two of the defendants moved for

summary judgment and claimed that, after they sold the subdivision, “they did not

construct or aid in the construction of the streets, spillway and underground conduits,

and were not legally responsible for any damage to plaintiffs arising therefrom.” 54

       The court noted that “[o]ne who erects a nuisance will sometimes be liable for

its continuance after he has parted with the possession of the land, particularly where

he conveys the property with covenants for the continuance of the nuisance or

otherwise derives benefit therefrom.”55 Further, according to the court, “[a]ll those

who participate in the creation or maintenance of a nuisance are generally liable to

third persons for injuries suffered therefrom.”56 The court denied the defendants

summary judgment on the nuisance claim based on disputed issues of material fact

about their contribution to the nuisance. It found that, in addition to the fact that the

53
   99 A.2d 248 (Del. Ch. 1953).
54
   Id. at 249.
55
   Id. at 250.
56
   Id.
                                           17
defendants were the original owners of the tract, they designed the lots and the streets

and their grades. They also supervised conduit placement and reserved the right to

use it themselves.

       Another decision illustrating this common-sense approach came thirty-two

years later, in Hazlett v. Fletcher.57 The defendants no longer owned or controlled

the property creating the nuisance. Relying on the Restatement (Second) of Torts,

the Court of Chancery refused to dismiss a nuisance claim. It reasoned that “where

a person participates to a substantial degree in creating a physical condition that is,

itself, harmful after the activity that created it has ceased, such person generally will

be subject to continuing liability for future harm.”58              Whether the defendants

substantially participated in the creation of the nuisance was a question that could

not be resolved on a motion to dismiss.59

       Although the Court of Chancery’s Keeley and Hazlett decisions show that

there is no “product based” or “control” exception to nuisance claims under

Delaware law, the Superior Court drew primarily from Sills v. Smith & Wesson

57
   1985 WL 149636, at *2 (Del. Ch. Mar. 1, 1985).
58
   Id.
59
   Id. More recently, in Robinson v. Oakwood Vill., LLC, 2017 WL 1548549 (Del. Ch. Apr. 28,
2017), the Court of Chancery entered judgment following trial in favor of the defendants because
they did not own or control the property. But the court distinguished Keely and Hazlett by noting
that “insufficient evidence [existed] on which to extend liability beyond the fee owner during the
periods relevant to trespass and nuisance liability.” Id. at *16 n.219.
                                               18
Corp.,60 State ex rel. Jennings v. Purdue Pharma L.P.,61 and Patton v. Simone.62

Sills involved negligence and public nuisance claims brought by the City of

Wilmington against gun manufacturers and others stemming from gun violence in

Wilmington. The court observed that Delaware law includes “no express authority

[] requiring public nuisance claims be restricted to those based on land use,” but the

court also stated without a supporting citation that “Delaware courts remain hesitant

to expand public nuisance” to include product-based claims.63 The court ultimately

avoided the issue, holding that the City failed to state an “independent claim for

public nuisance” because the public nuisance claims were subsumed in the City’s

negligence claims.64

       Purdue Pharma involved public nuisance claims brought by the State against

opioid manufacturers, distributors, and pharmacies stemming from the opioid

epidemic. The Superior Court dismissed the State’s claims and held that “[a]

defendant is not liable for public nuisance unless it exercises control over the

instrumentality that caused the nuisance at the time of the nuisance.”65 In reaching

this conclusion, the court relied foremost on the Sills court’s description of Delaware

courts as “hesitant” to recognize product-based public nuisance claims. The court

60
   2000 WL 33113806 (Del. Super. Dec. 1, 2000).
61
   2019 WL 446382 (Del. Super. Feb. 4, 2019).
62
   1992 WL 398478 (Del. Super. Dec. 14, 1992); 1992 WL 183064 (Del. Super. June 25, 1992).
63
   Sills, 2000 WL 33113806, at *7.
64
   Id.
65
   Purdue Pharma, 2019 WL 446382, at *13.
                                            19
also relied on Patton, where the court held in early summary judgment decisions that

one must own or control the property to be liable for public nuisance.66 But in a later

decision in the same series of cases, the Patton court ruled consistent with

Delaware’s substantial-participation approach that a defendant “would not be liable

as it did not carry on the activity which created the nuisance nor assist in carrying it

out.”67

                                             B.

       After reviewing the Restatement and the Delaware cases, we conclude that the

State has stated a claim for public nuisance. At the outset, we are not persuaded, as

the Superior Court found, that “product claims are not encompassed within the

public nuisance doctrine.”68 The most that can be gleaned from Sills and Purdue

Pharma is that the statement in both cases about a “hesitancy” to recognize product-

based public nuisance claims was unsupported. In Patton, the court specifically

recognized that those who assist in carrying on a nuisance can be liable for

nuisance.69 Further, historical examples abound of products that were held to create

66
   1992 WL 398478, at *9; 1992 WL 183064, at *13.
67
   1993 WL 54462, at *13 (Del. Super. Jan. 28, 1993) (emphasis added).
68
   State ex rel. Jennings, 2022 WL 2663220, at *4.
69
   1993 WL 54462, at *13.
                                             20
a public nuisance.70 Those same cases do not support the notion that a defendant

must have “control of its product at the time of the alleged nuisance.”71

       The issue, therefore, is not whether a product is involved or whether the

defendant exercised control of the product at the time of the alleged nuisance.

Instead, the crux of the issue is: can a product manufacturer be held liable after a

product it manufactures is sold to third parties whose activities release the product

into the environment and cause a public nuisance? For the environmental-based

public nuisance claim before us, Monsanto can be held liable when it substantially

contributed to a public nuisance by misleading the public and selling a product it

knew would eventually cause a safety hazard and end up contaminating the

environment for generations when used by industry and consumers.

       First, under the Restatement (Second) of Torts, a nuisance causing activity

includes “all acts that are a cause of harm.”72 The Second Restatement also provides

that a defendant is liable for nuisance “not only when he carries on the activity but

70
   Examples of product-based public nuisance in the Second Restatement include explosives and
fireworks. Restatement (Second) of Torts § 821B cmt. b. See also Leslie Kendrick, The Perils
and Promise of Public Nuisance, 132 Yale L.J. 702, 738-39 (2023) (“[W]ritings such as
Sheppard’s and Blackstone’s give the lie to the common assertion . . . that public nuisance
pertained only to the use of the land. Several of Sheppard’s and Blackstone’s examples are not
land-based, including setting off fireworks, being an eavesdropper, and being a common scold[,]
[a]nd . . . ‘victuallers, butchers, bakers, cooks, brewers, maltsters and apothecaries who sell
products unfit for human consumption.’”) (internal footnotes omitted); Craven v. Fifth Ward
Republican Club, Inc., 146 A.2d 400 (Del. Ch. 1958) (entering a preliminary restraining order to
enjoin, as a public nuisance, the illegal sale of alcohol).
71
   Answering Br. at 4.
72
   Restatement (Second) of Torts § 834 cmt. b.
                                              21
also when he participates to a substantial extent in carrying it on.”73 As alleged in

the complaint, continuing to supply PCBs, which were known to be toxic to humans

and wildlife, to industry and to consumers, knowing PCBs would escape and

permanently contaminate Delaware’s lands and waters, and taking affirmative steps

to mislead the public and government officials about the safety of PCBs, qualifies

as participating to a substantial extent in carrying on a public nuisance.

       It bears noting that comment “g” to Section 8 of the Restatement (Third) of

Torts states that it excludes from economic loss nuisance liability for products like

handguns, opioids, and tobacco.74 This decision does not reach the question whether

Delaware law categorically forecloses nuisance claims against manufacturers of

products like handguns, opioids, and tobacco for harms caused by those products to

a public right. It is sufficient for present purposes to say that comment “g” does not

73
   Id. § 834. The Delaware courts generally consider the Restatement persuasive authority. See
Fox v. Fox, 729 A.2d 825, 828-29 (Del. 1999) (explaining that “[w]e find [the Restatement
(second)] . . . not only persuasive but promotive of humanitarian goals”); Estate of Tigani, 2016
WL 593169, *18 (Del. Ch. Feb. 12, 2016) (recognizing that “Delaware courts generally find the
Restatement of Laws to be persuasive authority on many topics”); Stayton v. Delaware Health
Corp., 117 A.3d 521, 533-34 (Del. 2015) (explaining that “Delaware has followed the Restatement
(Second) of Torts in its application of the collateral source rule”); In re Peierls Family Inter Vivos
Trusts, 77 A.3d 249, 255 (Del. 2013) (explaining that “[w]hen confronted with a choice-of-law
issue, Delaware courts adhere to the Restatement (Second) of Conflict of Laws”); Falconi v.
Coombs & Coombs, Inc., 902 A.2d 1094, 1099 (Del. 2006) (explaining that “[i]n the context of
determining vicarious liability for a tort, this Court has recognized the value of the Restatement
(Second) of Agency as an aid in deciding whether an individual is an employee or independent
contractor”).
74
   Restatement (Third) of Torts: Liab. for Econ. Harm § 8 cmt. g (2020).
                                                 22
target products like PCBs that cause environmental harm, as reflected in comment

“a” to that same Section:

         [t]his Section addresses the liability in tort of a defendant who creates
         a public nuisance that results in economic loss to the plaintiff. This
         Section does not seek to restate the substantive law of public nuisance
         except as necessary to explain those cases that produce liability in tort
         for economic loss alone. Many public nuisances are not of that
         character; they cause physical harm, as when a defendant negligently
         leaves an obstruction in a road and the plaintiff collides with it, or as
         when a defendant’s pollution causes damage to property that the
         plaintiff owns. Those cases are outside the scope of this Section. 75

         The comments to Restatement (Third) of Torts confirm that, for purposes of

public nuisance, products like handguns, opioids, and cigarettes are not the same as

products like PCBs that cause environmental harm to property and economic loss to

the plaintiff.

         Second, as noted earlier, Delaware courts have historically taken a common-

sense approach to the issue. In the Keeley and Hazlett cases, the trial court

recognized that, even when the defendant is not a property owner causing the

nuisance, “where a person participates to a substantial degree in creating a physical

condition that is, itself, harmful after the activity that created it has ceased, such

person generally will be subject to continuing liability for future harm.”76 It is

reasonably conceivable that Monsanto substantially participated in creating the

75
     Id. § 8 cmt. a.
76
     Hazlett, 1985 WL 149636, at *2.
                                            23
public nuisance by selling PCBs to industry and to consumers knowing PCBs would

escape in the environment and contaminate the State’s lands and waters for

generations.

       Third, the State joins a long line of government plaintiffs throughout the

country to assert public nuisance cases against Monsanto for PCB environmental

contamination, and our view is consistent with almost all those cases. As those

courts found, the complaints alleged that Monsanto substantially contributed to a

public nuisance because it knew for some time that PCBs would cause long-lasting

environmental harm when used by third parties and hid those dangers from the

public until forced to cease production.77

77
   All but one of the Monsanto PCB cases in other jurisdictions survived motion to dismiss on the
public nuisance claim. Abbatiello v. Monsanto Co., 522 F. Supp. 2d 524, 541 (S.D.N.Y. 2007)
(denying Monsanto’s motion to dismiss because the plaintiffs sufficiently pled that Monsanto
substantially participated in creating the nuisance by alleging that Monsanto manufactured and
sold the PCBs to General Electric Company and concealed the dangers of PCBs from General
Electric Company); City of Spokane v. Monsanto Co., 2016 WL 6275164, at *8 (E.D. Wa. Oct.
26, 2016) (denying Monsanto’s motion to dismiss because the plaintiff alleged that the PCBs
migrated into the river even when, and regardless of whether, products containing PCBs were used
or disposed of as intended (widespread use), and Monsanto knew that widespread use of the PCBs
it manufactured was contaminating the environment); City of San Jose v. Monsanto Co., 231 F.
Supp. 3d 357, 363 (N.D. Cal. 2017) (denying Monsanto’s motion to dismiss because the plaintiff
sufficiently pled that “Monsanto knew that PCBs were dangerous, concealed that knowledge,
promoted the use of PCBs in a range of applications, and gave disposal instructions that were likely
to cause environmental contamination”); City of Seattle v. Monsanto Co., 237 F. Supp. 3d 1096,
1106–07 (W.D. Wash. 2017) (denying Monsanto’s motion to dismiss because the plaintiff
adequately pled that Monsanto was the sole PCB producer, Monsanto promoted PCBs across many
different uses/markets, PCBs were the most widespread contaminant in the river, Monsanto knew
PCBs were dangerous, and Monsanto was on notice in 1960s that PCBs were uncontrollable
pollutants that endangered the environment as a result of their normal and intended use); Port of
Portland v. Monsanto Co., 2017 WL 4236561, at *9 (D. Or. Sept. 22, 2017) (denying Monsanto’s
motion to dismiss because the parties did not sufficiently brief the issue of “whether a plaintiff can

                                                 24
       For instance, in Mayor & City Council of Baltimore v. Monsanto Co., the

Maryland District Court denied Monsanto’s motion to dismiss because the City of

Baltimore “sufficiently alleged that [Monsanto] created or substantially participated

in the creation of PCBs, even though Defendants may not have maintained control

over the contaminants once disseminated in the City’s waters.”78 The court relied

on the allegations that “Monsanto manufactured, distributed, marketed, and

promoted PCBs, resulting in the creation of a public nuisance that is harmful to

health and obstructs the free use of the City’s stormwater and other water systems

bring a public nuisance claim for damages when the claim overlaps with a product liability claim”);
City of Long Beach v. Monsanto Co., 2018 WL 4846657 (C.D. Cal. Aug. 21, 2018) (denying
Monsanto’s motion to dismiss on other grounds not relevant to this case); County of Los Angeles
v. Monsanto Co., 2019 WL 13064885, at *10 (C.D. Cal. Nov. 21, 2019) (denying Monsanto’s
motion to dismiss because the plaintiffs sufficiently pled that “[Monsanto] knew that PCBs were
toxic as early as the 1930s, and certainly by the 1950s . . . [but] continued to promote the use of
PCBs in a wide variety of products and downplay the danger of PCBs . . . and instructed its
customers to dispose of PCB containing wastes in local landfills, knowing that landfills were not
suitable for PCB-contaminated waste”); Mayor of Baltimore v. Monsanto Co., 2020 WL 1529014,
at *10 (D. Md. Mar. 31, 2020) (denying Monsanto’s motion to dismiss because the plaintiff
adequately alleged that Monsanto created or substantially participated in the creation of the PCBs,
knew about PCBs’ harmful effects, intentionally withheld that information and misrepresented to
the public and government officials that PCBs were safe, and manufactured and distributed PCBs
that ended up in Baltimore’s waters, causing harm to humans, animals, and environment); Illinois
ex rel. Raoul v. Monsanto Co., 2023 WL 3292591, at *3 (N.D. Ill. May 5, 2023) (denying
Monsanto’s motion to dismiss because Monsanto created or participated in the creation of the
nuisance by selling PCBs even though it knew PCBs would “inevitably leach into and pollute the
State’s natural resources even in the absence of any negligence on the part of the buyer”);
Commonwealth v. Monsanto Co., 269 A.3d 623, 652 (Pa. Commw. Ct. 2021) (denying Monsanto’s
motion to dismiss because “Plaintiffs clearly declare that [Monsanto] [is] responsible for PCBs
entering the Commonwealth’s waters because [Monsanto] knew that the uses for which they
marketed, sold, and distributed PCB mixtures would result in leaching, leaking, and escaping their
intended applications and contaminating (i.e., polluting) those waters”); but see Town of Westport
v. Monsanto Co., 2015 WL 1321466, at *4 (D. Mass. Mar. 24, 2015) (granting Monsanto’s motion
to dismiss because Monsanto did not have control of the PCB containing products).
78
   2020 WL 1529014, at *10.
                                                25
and waters.”79 It noted further that Monsanto had knowledge of the harmful effects

of PCBs and intentionally withheld that information and made misrepresentations to

the public and government officials.

       Here, the State has pled sufficiently that Monsanto, as the sole PCB producer,

substantially participated in the creation of the public nuisance. It alleged that

Monsanto knew early on about the dangers of PCBs.             In 1937, an internal

memorandum reported that “[e]xperimental work in animals show[ed] that

prolonged exposure to Aroclor vapors evolved at high temperatures or by repeated

oral ingestion will lead to systemic toxic effects.”80 The next year, a Harvard

professor presented her findings to Monsanto on the toxic effects of PCBs. In 1953,

Monsanto’s manager of environmental health drafted an internal memorandum that

advised that PCBs could not be considered nontoxic.81 Two years later, its chief

chemist circulated internally an article that reported on the toxicity of PCBs.82 In

addition to these internal communications, “[t]hroughout the 1940s and 1950s,

scientists continued to report to Monsanto on the widespread, harmful effects of

PCBs.”83

79
   Id.
80
   App. to Opening Br. at A027.
81
   Id. at A028.
82
   Id. at A029.
83
   Id. at A031.
                                         26
       According to the allegations of the complaint, knowing this information,

Monsanto took affirmative steps to conceal the toxic nature of PCBs and spread

misinformation about PCBs negative health effects.         Beginning with its own

customers, in 1947, it told an inquiring customer that one of its PCB mixtures was

safe and almost non-toxic.84 It instructed employees to tell customers that systemic

toxic effects were not significant.85    Its misrepresentations did not stop with

customers. In 1957, the U.S. Navy refused to use PCBs in its submarines after it

conducted an independent test that revealed the toxic nature of PCBs.86 Monsanto

nevertheless attempted to change the Navy’s mind.

       In 1969, Monsanto also wrote the Los Angeles Air Pollution Control District

and advised it that PCBs were not toxic either by oral ingestion or skin absorption.87

It sent a similar letter to the Regional Water Quality Control Board denying any

special health or environmental problems linked with PCBs.88 Later that year, it

made similar misrepresentations to the National Air Pollution Control

Administration and stated that it could not “conceive how the PCBs can be getting

into the environment in a widespread fashion.”89

84
   Id. at A028.
85
   Id.
86
   Id. at A030.
87
   Id. at A043-44.
88
   Id. at A044.
89
   Id.
                                         27
       Monsanto also used a misleading advertisement to conceal the toxic nature of

PCBs. In a 1961 brochure, Monsanto promoted PCBs as being widely used in

household items.90 By 1970, however, it sought to distance itself from its earlier

promotion. In a press release, it stated that PCBs were “primarily for use as a coolant

in electrical transformers and capacitors . . . [and] not [for use as] a ‘household’

item.”91 Nevertheless, it continued to market and to sell PCBs for use in household

items. Monsanto went as far as establishing a committee and tasking it with

“preparing recommendations for actions that Monsanto could take to improve its

reputation and salvage its bottom line.”92 One of the recommendations was to beef

up the talking points for its employees when discussing the danger of PCBs with

customers.

       Accepting these allegations as true, as we must at this stage of the

proceedings, it is reasonably conceivable that Monsanto substantially participated in

the creation of a public nuisance by manufacturing and selling PCBs that it sold to

industry and consumers and knew PCBs would eventually end up causing long

lasting contamination to state lands and waters.

90
   Id at A042.
91
   Id. at A043.
92
   Id. at A037.
                                          28
                                             III.

       Turning to the State’s trespass claim, the Restatement (Second) of Torts

provides:

       [o]ne is subject to liability to another for trespass, irrespective of
       whether he thereby causes harm to any legally protected interest of the
       other, if he intentionally
           (a) enters land in the possession of the other, or causes a thing
           or a third person to do so, or
           (b) remains on the land, or
           (c) fails to remove from the land a thing which he is under a
           duty to remove.93

       The Superior Court dismissed the State’s trespass claim on two grounds: first,

the State did not have exclusive possession of lands it holds in public trust; and

second, Monsanto did not control the PCBs trespassing on the State’s land.

       On appeal, the State argues that it has exclusive possession of land it holds

directly and also in public trust because the State has the right to exclude unwanted

persons or objects. And it contends that the disposition of the control issue for public

nuisance dictates the result for its trespass claim.

93
   Restatement (Second) of Torts § 158 (1965). See Amer v. NVF Co., 1994 WL 279981, *3 (Del.
Ch. June 15, 1994) (citing Restatement (Second) of Torts § 158 (1965)) (“A prima facie case of
trespass is established when plaintiff shows that defendant intentionally and without consent
entered onto real property belonging to the plaintiff.”).
                                             29
                                                A.

       Subaqueous lands are held by the State in trust for the public.94 Section 157

of the Restatement (Second) of Torts defines possession, for the purposes of trespass,

as one who:

       (a) is in occupancy of land with intent to control it, or (b) has been but
       no longer is in occupancy of land with intent to control it, if, after he
       has ceased his occupancy without abandoning the land, no other person
       has obtained possession as stated in Clause (a), or (c) has the right as
       against all persons to immediate occupancy of land, if no other person
       is in possession as stated in Clauses (a) and (b).95
       The Second Restatement defines “occupancy” as “acts done upon the land as

manifest a claim of exclusive control of the land, and indicate to the public that he

who has done them has appropriated it.”96 The Second Restatement also states that

“[t]he word ‘intrusion’ is used throughout the Restatement of this Subject to denote

the fact that the possessor’s interest in the exclusive possession of his land has been

invaded by the presence of a person or thing upon it without the possessor’s

consent.”97 Under Delaware law, “[o]nly a person in possession of the property

may allege a trespass action.”98

94
   See Illinois Cent. R. Co. v. State of Illinois, 146 U.S. 387, 452 (1892); Bailey v. Philadelphia,
W. & B.R. Co., 1846 WL 726, *1 (Del. June 1846).
95
   Restatement (Second) of Torts § 157.
96
   Id. § 157 cmt. a (emphasis added).
97
   Id. § 158 cmt. c (emphasis added).
98
   Pilots’ Ass’n for Bay & River Delaware v. Lynch, 1992 WL 390697, *3 (Del. Super. Nov. 19,
1992) (citing Reed v. Dehorty, 1804 WL 234 (Del. Com. May 15, 1804)).
                                                30
       Other jurisdictions applying the Second Restatement have found that a state

does not have exclusive possession of land it holds in public trust. For example, in

New Jersey Department of Environmental Protection v. Hess Corporation, the New

Jersey Superior Court dismissed a trespass claim brought by the state for

environmental contamination of the state’s natural resources.99 It held that “[l]and

in the public trust is held by the State on behalf of a second party, the people. Such

land cannot be in ‘exclusive possession’ of the State as the interest created by the

doctrine is intended to ensure that others have use of the same land.”100 The

Maryland Federal District Court also “dismiss[ed] the State’s trespass claim to the

extent it [wa]s based on properties outside of its exclusive possession—i.e., its

natural waters and the properties of its citizens.”101 Several other jurisdictions, many

of whom relied on the Second Restatement, have followed suit.102

       Here, the State argues that property it holds in trust is in its exclusive

possession because it can exclude certain people from the property.103 But the public

trust doctrine significantly limits the State’s right to exclude others. At best, the

99
   2020 WL 1683180, *6 (N.J. Super. Ct. App. Div. Apr. 7, 2020).
100
    Id. (footnote omitted).
101
    State v. Exxon Mobil Corp., 406 F. Supp. 3d 420, 471 (D. Md. 2019).
102
    See, e.g., New Mexico v. Gen. Elec. Co., 467 F.3d 1223, 1247 n.36 (10th Cir. 2006) (“[T]he
State as guardian of the public trust has no possessory interest in the sand, gravel, and other
minerals that make up the aquifer—a necessary requisite to maintaining a trespass action.”).
103
    The State relies on Kane v. NVR, Inc., 2020 WL 3027239 (Del. Ch. June 5, 2020), an order on
exceptions to a Master’s Report. In Kane, however, the court did not discuss the exclusive
possession requirement. It simply noted that trespass interferes with the plaintiff’s possession of
land. Id. at * 6.
                                                31
State shares possession with the public. The State admits that it may only “impair

or take away these public rights for public purposes.”104 In other words, the State’s

control over the land is non-exclusive and may at times be subordinate to the public’s

right to travel, hunt, or fish. We conclude that the State does not have exclusive

possession of land it holds in trust. Thus, the Superior Court properly dismissed the

State’s trespass claim for lands it holds in public trust.105

                                                  B.

       The State also asserts trespass claims for land it holds directly. The parties

appear to agree that the State satisfies the exclusive possession requirement for a

trespass claim as to those lands. For this category of claims, the parties dispute the

Superior Court’s holding that a defendant must control the intruding instrumentality

at the time of the trespass.

       To state a trespass claim against a non-landowner for environmental harm,

“[i]t is enough that an act is done with knowledge that it will to a substantial

104
    Opening Br. at 35 (emphasis added).
105
    Monsanto also argues that the State does not allege damage to its lands. But the failure to allege
damages is not fatal to a trespass claim. Under the Restatement (Second) of Torts § 163, “[o]ne
who intentionally enters land in the possession of another is subject to liability to the possessor for
a trespass, although his presence on the land causes no harm to the land, its possessor, or to any
thing or person in whose security the possessor has a legally protected interest.” Rather, “[t]he
fact that the actor knows that his entry is without the consent of the possessor and without any
other privilege to do so, while not necessary to make him liable, may affect the amount of damages
recoverable against him, by showing such a complete disregard of the possessor’s legally protected
interest in the exclusive possession of his land as to justify the imposition of punitive in addition
to nominal damages for even a harmless trespass, or in addition to compensatory damages for one
which is harmful.” Id. § 163 cmt. e.
                                                 32
certainty result in the entry of the foreign matter.”106 In its complaint, the State

identified two State-owned facilities that are located on a former military base the

State purchased in 1947. It also alleged that the facilities are located next to “a

former landfill in which PCB-containing materials were deposited” and “[b]oth state

and federal agencies have undertaken cleanup, with the EPA removing PCB-

contaminated soil from the area and DNREC performing treatment to eliminate

hazardous runoff from the site.”107 It is reasonable to infer from these allegations

that the two facilities were contaminated by PCBs emanating from the adjoining

landfill. At least for the military base property, the State has the requisite exclusive

possessory interest to assert a trespass claim.              If there are other state-owned

properties contaminated by PCBs, on remand the State can amend its complaint to

identify those parcels and plead a trespass claim.

          While Monsanto might not have owned adjoining land or dumped the PCBs

directly onto the State’s land, as the only manufacturer of PCBs in the United States,

it substantially contributed to the entry onto the State’s land by supplying PCBs to

Delaware manufacturers and consumers, knowing that their use would eventually

trespass onto other lands. Accepting these allegations as true, the State has pled

sufficiently a trespass claim for land it owns directly.

106
      Restatement (Second) of Torts § 158 cmt. i (emphasis added).
107
      App. to Opening Br. at A055 (the complaint).
                                                33
                                               IV.

       Finally, the State argues that the court erred on two grounds when it dismissed

its unjust enrichment claim: first, the Superior Court did not have jurisdiction to hear

an unjust enrichment claim as standalone claim; and, second, the State did not allege

that Monsanto was “enriched” by avoiding future PCB cleanup expenses. According

to the State, the Superior Court has jurisdiction because unjust enrichment is a legal

as opposed to an equitable claim. It also contends that Monsanto was enriched by

the State shouldering the burden of PCB cleanup throughout Delaware.

                                               A.

       Unjust enrichment is “the unjust retention of a benefit to the loss of another,

or the retention of money or property against the fundamental principles of justice

or equity and good conscience.”108 An unjust enrichment claim can be brought as a

standalone claim or as a remedy for other claims, like nuisance and trespass. 109

108
    Fleer Corp. v. Topps Chewing Gum, Inc., 539 A.2d 1060, 1062 (Del. 1988) (quoting 66 Am.
Jur. 2d Restitution and Implied Contracts § 3 (1973)); Schock v. Nash, 732 A.2d 217, 232 (Del.
1999) (quoting same).
109
    Garfield on behalf of ODP Corp. v. Allen, 277 A.3d 296, 341 (Del. Ch. 2022) (quoting Dan B.
Dobbs, Law of Remedies: Damages—Equity—Restitution § 4.1(1), at 366 (2d ed. 1993)). See also
Eric J. Konopka, Hey, That’s Cheating! The Misuse of the Irreparable Injury Rule as a Shortcut
to Preclude Unjust-Enrichment Claims, 114 Colum. L. Rev. 2045, 2054 (2015) (“When discussing
restitution and unjust enrichment, many authors refer to the ‘substantive’ side and the ‘remedial’
side of the phrase. Substantive unjust enrichment deals with whether, given the facts of the case,
the plaintiff can establish a viable unjust-enrichment claim. The remedial component concerns
what relief is granted for the violation of the substantive right.”).
                                               34
       The Superior Court found that “[u]njust enrichment is an equitable claim” and

therefore could not be heard in the Superior Court.110 In reaching this conclusion,

the trial court applied the holding of two Superior Court decisions that found that

unjust enrichment cannot be brought as a standalone claim in Superior Court.111

Those decisions, however, reflect the confusion caused by one of the elements of an

unjust enrichment claim – the absence of an adequate remedy at law.

       As traditionally articulated by Delaware courts, to support a standalone claim

for unjust enrichment, a plaintiff must plead: (1) an enrichment; (2) an

impoverishment; (3) a relation between the enrichment and the impoverishment; (4)

the absence of justification; and (5) the absence of a remedy provided by law.112 In

Garfield, however, Vice Chancellor Laster thoroughly explored the provenance of

an unjust enrichment claim.113 We need not repeat that detailed analysis here except

to say that, as this Court concluded in Crosse v. BCBSD, Inc., unjust enrichment is

historically a legal, not an equitable, claim.114 The absence of an adequate remedy

110
    State ex rel. Jennings, 2022 WL 2663220, at *6.
111
    Purdue Pharma, 2019 WL 446382, at *14; Incyte Corp. v. Flexus Biosciences, Inc., 2017 WL
7803923, at *3-*4 (Del. Super. Nov. 1, 2017). In Incyte, the Superior Court found it did not have
jurisdiction over the unjust enrichment claim because the dispute was subject to arbitration. The
quote from the decision that the Superior Court relied on – “unjust enrichment may be considered
as part of damages if liability is found but it does not survive as a standalone claim” – referred to
the fact that the Delaware Uniform Trade Secrets Act displaced the unjust enrichment claim, and
not that the court lacked jurisdiction to hear the claim. Id. at *3.
112
    Nemec v. Schrader, 991 A.2d 1120, 1130 (Del. 2010).
113
    Garfield, 277 A.3d at 347-51.
114
    836 A.2d 492, 496-97 (Del. 2003) (explaining that an unjust enrichment claim is an “off-the-
contract theory of recovery” and is a legal, not an equitable claim).
                                                35
at law is required only if an unjust enrichment claim is brought in the Court of

Chancery and there is no other independent basis for equitable jurisdiction. 115 The

Superior Court had jurisdiction to consider the State’s standalone unjust enrichment

claim.

                                                 B.

         The Superior Court dismissed the State’s unjust enrichment claim on the

alternative ground that the State did not plead that Monsanto was enriched.

Although the State pled that Monsanto was relieved of paying for cleanup expenses

through the State’s use of taxpayer money, the court held that “there is no Delaware

authority supporting the proposition that relief from future obligations amounts to a

claim for unjust enrichment.”116 On appeal the State argues that “Monsanto has been

enriched by virtue of being able to walk away from the environmental contamination

it created, while the State, and Delawareans, shoulder the burden of cleaning up

Monsanto’s PCBs throughout Delaware.”117

         Under the Restatement (Third) of Unjust Enrichment and Restitution:

         (1) A person who performs another’s duty to a third person or to the
         public is entitled to restitution from the other as necessary to prevent

115
    Garfield, 277 A.3d at 351 (“If a plaintiff seeks to pursue a claim for unjust enrichment in the
Court of Chancery and has no other basis for equitable jurisdiction, then the plaintiff must establish
the absence of a remedy at law to establish equitable jurisdiction. Colloquially speaking, the
absence of a remedy at law can be viewed as an element of the claim. Outside of a dispute over
jurisdiction, however, it is not necessary for a plaintiff to plead or later prove the absence of an
adequate remedy at law.”).
116
    State ex rel. Jennings, 2022 WL 2663220, at *7.
117
    Opening Br. at 45.
                                                 36
          unjust enrichment, if the circumstances justify the decision to intervene
          without request.
          (2) Unrequested intervention may be justified in the following
          circumstances:
              (a) the claimant may be justified in paying another’s money
              debt if there is no prejudice to the obligor in substituting a
              liability in restitution for the original obligation;
              (b) the claimant may be justified in performing another’s duty
              to furnish necessaries to a third person, to avoid imminent harm
              to the interests of the third person; and
              (c) the claimant may be justified in performing another’s duty
              to the public, if performance is urgently required for the
              protection of public health, safety, or general welfare.
          (3) There is no unjust enrichment and no claim in restitution by the rule
          of this section except insofar as the claimant’s intervention has relieved
          the defendant of an otherwise enforceable obligation.118

          As the Restatement provides, “unrequested intervention” – which is the case

here – does not typically result in an enrichment unless done under subsection (2)(c)

to remedy an emergency or under (3) for a pre-existing duty that is not being

performed by the defendant. Neither applies here. First, the emergency exception

has typically been applied when there is an urgent and immediate need to abate a

harm. While few would doubt that PCB contamination is a threat to the public

health, the situation here is not emergent in that it is time-sensitive like a tanker truck

spilling its contents along the highway that causes immediate environmental

118
      Restatement (Third) of Restitution and Unjust Enrichment § 22 (2011).
                                                37
contamination. PCB environmental contamination is serious but not necessarily

time-sensitive; unfortunately, it has persisted for decades.119

        Second, other than through tort liability, the State has not directed us to “an

otherwise enforceable obligation” imposed on Monsanto to pay for the State’s

remediation efforts. The State cites two cases for the proposition that unjust

enrichment claims apply “in the context of a public entity undertaking pollution

abatement costs,”120 but one case involved an explicit statutory duty,121 and the other

did not address whether the claim for unjust enrichment was viewed as a remedy for

a tort or a standalone claim.122 As noted earlier, unjust enrichment can be part of the

State’s remedy under public nuisance and trespass. As a standalone claim, however,

it fails.

                                                V.

        We affirm the Superior Court’s ruling that the State failed to state a claim for

unjust enrichment and for trespass to lands that the State holds in public trust, but

119
    Id. § 22 cmt. h. See, e.g., City of Jacksonville v. Sohn, 616 So. 2d 1173, 1175 (Fla. Dist. Ct.
App. 1993) (holding that the City of Jacksonville could not maintain an action for the cost of
abating nuisance conditions because “the City has in no way alleged that it was acting under an
emergency when it abated the nuisances on appellee’s properties”); Wyandotte Transport Co. v.
United States, 389 U.S. 191, 204 (1967) (holding that “the [relevant] facts surrounding that
sinking. . . constitute a classic case in which rapid removal by someone was essential”).
120
    Opening Br. at 46.
121
    See State v. Schenectady Chems., Inc., 479 N.Y.S.2d 1010, 1014 (N.Y. App. Div. 1984) (state
law imposed a duty upon polluters to abate the pollution).
122
    App. to Opening Br. at A149–50 (The State of Ohio v. Monsanto Co. et al., No. A1801237
(Ohio Com. Pl. Sept. 19, 2018)) (denying Monsanto’s motion to dismiss a claim for unjust
enrichment where the court had also denied the motion as to the public nuisance and trespass
claims).
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we reverse its ruling that the State failed to state a claim for public nuisance and for

trespass to lands that the State owns directly. The case is remanded to the Superior

Court for further proceedings consistent with this opinion.

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