FILED
                                               United States Court of Appeals
                UNITED STATES COURT OF APPEALS         Tenth Circuit

                       FOR THE TENTH CIRCUIT                      February 21, 2018
                     _________________________________
                                                                 Elisabeth A. Shumaker
                                                                     Clerk of Court
CHARLES BRYER,

       Plaintiff - Appellant,

v.                                                 No. 17-6114
                                           (D.C. No. 5:15-CV-01218-HE)
CONOCOPHILLIPS, CO.;                               (W.D. Okla.)
PHILLIPS 66, CO.,

       Defendants - Appellees.
                    _________________________________

                        ORDER AND JUDGMENT *
                     _________________________________

Before BACHARACH, MURPHY, and McHUGH, Circuit Judges.
               _________________________________

      This appeal involves an issue of timeliness. The plaintiff, Mr.

Charles Bryer, lived near an oil refinery that emitted a chemical known as

benzene. Years later, he was diagnosed with a form of leukemia known as

Acute Myeloid Leukemia.

      Mr. Bryer sued the owner of the refinery, ConocoPhillips, for

negligence, negligence per se, and strict liability. But he waited to sue

until roughly nine years after his diagnosis. Because a two-year limitations



*
      This order and judgment does not constitute binding precedent except
under the doctrines of law of the case, res judicata, and collateral estoppel.
But the order and judgment may be cited for its persuasive value under
Fed. R. App. P. 32.1(a) and Tenth Cir. R. 32.1(A).
period exists for these claims, the district court dismissed the suit based on

timeliness. We affirm.

I.    Background

      Mr. Bryer grew up in Ponca City, Oklahoma, near ConocoPhillips’s

refinery. For part of that time, Mr. Bryer also worked near the refinery.

While living and working near the refinery, Mr. Bryer experienced

symptoms—such as trouble breathing and a burning sensation in his eyes—

from emissions generated by the refinery. These symptoms led Mr. Bryer

to move away from the refinery in 1975.

      Mr. Bryer was not alone, and many Ponca City citizens expressed

concerns about the refinery. These concerns led a group of Ponca City

residents to bring a class-action suit against ConocoPhillips, claiming that

the refinery had emitted carcinogenic chemicals, including benzene. The

suit focused on property damage, but the plaintiffs also alleged that the

refinery’s emissions had caused or increased the risk of various diseases,

including cancer.

      ConocoPhillips settled and paid members of the class in 1990. Mr.

Bryer was one of the class members receiving a payment from the

settlement. He knew at the time that the payment was to compensate for

exposure to pollutants emitted by the refinery.

      Roughly sixteen years later (2006), a physician diagnosed Mr. Bryer

with Acute Myeloid Leukemia, telling him that benzene exposure from his

                                      2
residences and workplaces had “likely contributed to” his leukemia.

Appellant’s App’x at 132. Mr. Bryer did not follow up with his doctors

about the cause or source of his cancer.

      In 2015, Mr. Bryer met Ms. Samantha Hall, who had sued

ConocoPhillips. Ms. Hall told Mr. Bryer that a connection existed between

the refinery’s emissions and Acute Myeloid Leukemia. Later that year, Mr.

Bryer sued ConocoPhillips, attributing his leukemia to the refinery’s

emissions of benzene.

II.   Procedural History

      In district court, ConocoPhillips moved for summary judgment,

arguing that the claim had accrued in 2006, which is when Mr. Bryer had

been diagnosed with leukemia. Because a two-year period of limitations

existed, ConocoPhillips argued that the suit was time-barred. Mr. Bryer

argued that

             his claim had not accrued until his meeting with Ms. Hall in
              2015 and

             the doctrine of quasi-estoppel prevented ConocoPhillips from
              raising a timeliness defense.

      The district court granted summary judgment to ConocoPhillips,

concluding that

             the claim was untimely because Mr. Bryer should have known
              the underlying facts more than two years before he sued and

             quasi-estoppel did not apply because ConocoPhillips had not
              advanced inconsistent positions.
                                       3
Mr. Bryer appeals the grant of summary judgment.

III.   Standard of Review

       We engage in de novo review, considering the evidence in the light

most favorable to Mr. Bryer. Grynberg v. Total S.A., 

, 1346

(10th Cir. 2008). We must uphold the grant of summary judgment if the

evidence points only one way and is not susceptible to a reasonable

inference that the suit is timely. Elm Ridge Expl. Co. v. Engle, 

, 1216 (10th Cir. 2013).

IV.    Is the suit barred by the statute of limitations?

       As both parties acknowledge, we apply Oklahoma law on substantive

aspects of our timeliness inquiry, including Oklahoma’s rules on tolling.

1 On procedural aspects of this inquiry, however, we apply

federal law. Budinich v. Becton Dickinson & Co., 

, 158 (10th

Cir. 1986) (per curiam).

       The parties agree on the applicability of Oklahoma’s two-year period

of limitations for all of Mr. Bryer’s claims. Okla. Stat. tit. 12, § 95(A)(3).

The suit began in 2015. Therefore, the suit would ordinarily be considered

timely only if the cause of action had accrued since 2013. Mr. Bryer argues




1
     We strive to interpret Oklahoma law in the same manner that the
Oklahoma Supreme Court would. Schrock v. Wyeth, Inc., 

,
1280 (10th Cir. 2013).
                                       4
that the cause of action accrued in 2015; ConocoPhillips argues that the

cause of action accrued in 2006.

     A.    The Discovery Rule

     The discovery rule tolls the statute of limitations until the plaintiff

knows, or in the exercise of reasonable diligence should know, the facts

underlying the cause of action. Watkins v. Cent. State Griffin Mem’l Hosp.,

, 132 (Okla. 2016). Under this standard, a plaintiff “is

chargeable with knowledge of facts which he ought to have discovered in

the exercise of reasonable diligence.” Daugherty v. Farmers Coop. Ass’n,

, 951 (Okla. 1984).

     When the discovery rule applies, the statute of limitations is tolled

until the plaintiff knows or should know of the injury and the cause of the

injury. Woods v. Prestwick House, Inc., 

, 1189-90 (Okla.

2011). Knowledge of the injury and its cause would often be sufficient. But

here recognition of a cause of action would also require knowing the

source of the benzene. We may assume, for the sake of argument, that

uncertainty about the source of the emissions could toll the statute of

limitations. Under this assumption, the discovery rule would have tolled

the statute of limitations until Mr. Bryer knew or should have known of

          his injury (that he had leukemia),

          the cause of his injury (that the leukemia had been caused by
           benzene exposure), and


                                      5
           the source of the benzene (that ConocoPhillips’s refinery had
            emitted the benzene causing the leukemia).

     Both parties assume that the discovery rule applies. For the sake of

argument, we too may draw the same assumption.

     B.     Application of the Discovery Rule

     As noted above, summary judgment to ConocoPhillips was

appropriate if the undisputed evidence showed that Mr. Bryer should

reasonably have known before 2013: (1) his injury, (2) the cause of the

injury, and (3) the source of the benzene emissions.

     1.     Injury

     It is undisputed that Mr. Bryer knew of his injury in 2006—nine

years before he sued ConocoPhillips—when his doctors diagnosed him with

leukemia.

     2.     Cause

     It is also undisputed that Mr. Bryer knew the cause of his leukemia

(benzene exposure) in 2006, when his doctor told him that exposure to

benzene had “likely contributed to” his leukemia. Appellant’s App’x at

132; see Schrock v. Wyeth, Inc., 

, 1280 (10th Cir. 2013)

(stating that the plaintiff was aware of the cause of her symptoms when her




                                     6
doctor told her that a certain chemical was “quite possib[ly]” responsible

for her symptoms). 2

      3.    Source

      Mr. Bryer argues that he did not know the source of the benzene until

2015, when he spoke with Ms. Hall. This argument creates two issues:

      1.    When did Mr. Bryer know that the refinery emitted benzene?

      2.    When did he know that the refinery’s benzene emissions were
            the likely cause of his leukemia?

      a.    Knowledge of Benzene Emissions from the Refinery

      Mr. Bryer should have known by 2006 that the refinery emitted

benzene. Mr. Bryer argues in his reply brief that he could not have known

that the Ponca City refinery’s emissions had included benzene. Mr. Bryer

forfeited this argument by failing to raise it in his opening brief. Bronson

v. Swensen, 

, 1104 (10th Cir. 2007). 3

      Mr. Bryer’s argument would fail even if we were to overlook the

forfeiture. Mr. Bryer knew not only that the refinery had emitted a



2
      Mr. Bryer contends that the limitations period does not begin to run
until an expert expresses an opinion on causation. For the sake of
argument, we assume that Mr. Bryer is right. But this assumption does not
help him because an expert did express an opinion on causation in 2006
when his physician attributed the leukemia to benzene exposure.
3
      When an appellant omits an argument in the opening brief, we have
sometimes referred to the omission as a forfeiture and sometimes as a
waiver. Compare 

(forfeiture), with Anderson v.
U.S. Dep’t of Labor, 

, 1174 (10th Cir. 2005) (waiver).
                                      7
significant volume of chemicals but also that these emissions had included

benzene. For example, Mr. Bryer was aware that

          other Ponca City residents had expressed concerns about the
           refinery’s emissions and their impact on health and the
           environment and

          these concerns had led to a class-action complaint alleging
           harmful levels of benzene emissions from the refinery.

Other sources of information were also available to Mr. Bryer before 2013.

For example, multiple articles had noted the emission of benzene from the

refinery. In addition, Mr. Bryer was a member of the class-action suit

against ConocoPhillips, which alleged that the Ponca City refinery had

emitted harmful levels of benzene that increased the class members’ risk of

health problems. And the eventual settlement agreement acknowledged that

all class members had been advised by their attorneys and a medical

advisor that the ConocoPhillips refinery had caused, or may cause, cancer

or an increased risk of cancer. 4 Though Mr. Bryer might not have read the

settlement agreement, he knew when he received his settlement check that

ConocoPhillips was settling because the refinery had polluted the air and

groundwater.

     Of course, these facts do not establish that the refinery’s benzene

emissions were sufficiently concentrated to be harmful; indeed, that is the

4
      Mr. Bryer asserts that he should not have been expected to remember
the terms in a settlement agreement that he signed sixteen years earlier.
But a reasonably diligent plaintiff could have obtained a settlement
agreement that he or she had signed.
                                     8
ultimate question on the merits. And Mr. Bryer’s knowledge of allegations

of high levels of benzene emissions did not provide him with certain

knowledge of the refinery’s high emissions of benzene. But Mr. Bryer did

not need “conclusive evidence.” Alexander v. Oklahoma, 

,

1216 (10th Cir. 2004). Instead, he needed enough information to put him

on notice that he had a cause of action against ConocoPhillips. Based on

the available information, Mr. Bryer knew or should have known that the

refinery’s emissions had included benzene.

     b.    Knowledge of the Refinery as the Likely Source

     For a cause of action, Mr. Bryer also needed to know that the

refinery had been the likely source of the benzene. Maughan v. SW

Servicing, Inc., 

, 1387 (10th Cir. 1985). Mr. Bryer should

have been able to obtain this knowledge before 2013.

     Mr. Bryer was diagnosed with leukemia in 2006 and told that the

likely cause was benzene exposure from his residences and workplaces. In

addition to this statement, Mr. Bryer had his own recollection of symptoms

from the refinery’s emissions, knowledge that the refinery had emitted

benzene, awareness of the public controversy surrounding the refinery’s

emissions, and his own participation in a class-action suit alleging that

ConocoPhillips’s benzene emissions had increased the risk of cancer. With

such information, Mr. Bryer could reasonably have known before 2013 that



                                      9
his leukemia had likely been caused by benzene emissions coming from

ConocoPhillips’s refinery.

      Mr. Bryer relies primarily on Maughan v. SW Servicing, Inc., 

(10th Cir. 1985). In Maughan, the court relaxed Utah’s

discovery rule for cases involving suspected carcinogens because

           such cases frequently involve “a mass of complex,
            controversial and rapidly changing scientific data” and

           plaintiffs “may face enormous difficulties in determining when
            and where [they were] exposed to potential 

. The court stated that when the suspected cause is a

carcinogen, “the statute must be tolled until the plaintiff knows or should

know of facts supporting the likelihood that one particular suspected

carcinogen was the cause of his cancer, and has identified the likely source

of his exposure to that carcinogen.” 

(emphasis added). Mr.

Bryer does not dispute the first part of that test, for he acknowledges that

benzene caused the leukemia. But he invokes the second part of the test,

arguing that he could not have identified the refinery as the likely source

of his exposure to benzene. 5

      In Maughan, the court relied largely on scientific uncertainty about

the cause of the cancer. There the plaintiffs attributed the cancer to


5
       Mr. Bryer argues in his reply brief that the cancer might have
originated from exposure to benzene at his other jobs. But Mr. Bryer
forfeited this argument by waiting to raise it for the first time in his reply
brief. See p. 7 & note 3, above.
                                      10
radiation from the defendant’s uranium mill. But the doctors had told the

plaintiffs that the cause of the cancer was “unknown,” and the link between

low levels of radiation and cancer had not been scientifically established.

      The Maughan court added that even if the link between radiation and

cancer had been established, the plaintiffs lacked information tying their

cancers to the defendant’s radiation:

      [T]he mere fact that there were public statements concerning
      the possible link between radiation and leukemia is not enough
      to establish, as a matter of law, that the plaintiffs should have
      known that emissions from the uranium processing plant in
      Monticello were the likely cause of the leukemia of their
      children and spouse. None of the articles cited by the
      defendants directly and unambiguously links the Monticello
      mill tailings with leukemia. Nor can it be said, as a matter of
      law, that the average layman would understand, after reading
      that fall-out from atomic bombs causes cancer, that the local
      uranium mill may have caused decedents’ leukemia.

The court pointed to government studies, which had reassured

the plaintiffs of (1) the absence of any connection between the mill and the

cases of leukemia and (2) the existence of normal radiation levels at the

mill. 

Mr. Bryer analogizes these reassurances to

ConocoPhillips’s public statements about the absence of danger from the

refinery’s emissions.

      Based on Maughan, Mr. Bryer argues that even though the

carcinogenic potential of benzene was well known, he lacked enough



                                        11
information tying the refinery to his leukemia. Maughan’s language is

broad, but there are two problems with Mr. Bryer’s argument:

      1.    Unlike the plaintiffs in Maughan, Mr. Bryer had ample
            information identifying the refinery as a likely source of the
            benzene that caused his cancer.

      2.    Mr. Bryer has not provided evidence of other plausible sources
            of exposure to sufficiently high concentrations of benzene.

      First, there is far less scientific uncertainty here than in Maughan. In

Maughan, the cause of the cancer was not known, so it was inherently

difficult for the plaintiffs to attribute their cancer to the defendant’s mill.

But Mr. Bryer was able to tie his injury to ConocoPhillips’s refinery. A

physician told him not only that benzene had likely caused his cancer but

also that the exposure had likely come from his residences and workplaces.

This explanation pointed to the refinery because Mr. Bryer had lived and

worked near the refinery when he experienced the symptoms from chemical

emissions. And Mr. Bryer participated in a class-action suit against

ConocoPhillips, which attributed cancer to benzene emissions from the

Ponca City refinery. Together, the facts known and accessible to Mr. Bryer

diminished the scientific uncertainty that the plaintiffs in Maughan had

faced. See Grynberg v. Total S.A., 

, 1349-50 (10th Cir. 2008)

(distinguishing Maughan because the plaintiff in Grynberg had not faced

“similar scientific uncertainty or lack of expertise”).




                                       12
     Second, Mr. Bryer has not supplied a plausible alternative to the

refinery as the source of the benzene. For example, he does not give any

details on whether his other jobs exposed him to benzene and, if so, how

much. As a result, the refinery is the only plausible source based on the

information in the summary-judgment record. See Plaza Speedway Inc. v.

United States, 

, 1270-71 (10th Cir. 2002) (holding that the

plaintiffs had sufficient information when they discovered contaminants in

their well with “reason to suspect the source might have been the

neighboring property” because they knew that various chemicals had been

used on the neighboring property); accord Corcoran v. N.Y. Power Auth.,

, 543-44 (2d Cir. 1999) (holding that a claim accrued when

the plaintiff knew that he “may have been exposed to radiation” at his

workplace, that he had leukemia, and that a link existed between leukemia

and radiation exposure).

     In addition, Mr. Bryer does not identify any evidence of information

learned since 2013 about the likelihood of the refinery as the source of his

leukemia. Mr. Bryer states that in 2015, he overheard Ms. Samantha Hall

note a connection between the refinery’s emissions and Acute Myeloid

Leukemia. Mr. Bryer then contacted Ms. Hall to obtain additional

information, leading him to file the complaint in this case. But Ms. Hall

simply provided a contact with her law firm, alerting Mr. Bryer to the fact

that others had also accused ConocoPhillips of causing their cancers.

                                     13
      In essence, everything Mr. Bryer knows about his case now was

accessible to him before 2013; there is nothing that Mr. Bryer alleges now

that he could not have alleged before. Therefore, he could have brought his

suit before 2013 and the suit is barred by the statute of limitations. See

Samuel Roberts Noble Found. v. Vick, 

, 625 (Okla. 1992)

(“The operative date [for the discovery-rule inquiry] is that date on which

plaintiff could have brought suit.”).

                                    * * *

      In summary, Mr. Bryer knew or should have known before 2013 that

           he had leukemia,

           his leukemia had likely been caused by exposure to benzene,

           his exposure to benzene likely came from his residences and
            workplaces,

           he had lived and worked near the Ponca City refinery for much
            of his life,

           he had experienced symptoms while living and working near
            the refinery,

           the refinery had emitted benzene, and

           ConocoPhillips had settled a lawsuit—in which Mr. Bryer was
            a class member and received a settlement payment—alleging
            that the refinery had emitted toxic levels of benzene that
            caused or increased the risk of cancer.

Given these facts, Mr. Bryer was on notice before 2013 of the facts giving

rise to his claim. Therefore, the 2015 suit is barred by Oklahoma’s two-

year statute of limitations.
                                        14
V.    Is ConocoPhillips’s statute-of-limitations defense barred by
      quasi-estoppel?

      Mr. Bryer also argues that ConocoPhillips’s denial of culpability

prevents assertion of the statute of limitations. We disagree.

      Mr. Bryer invokes the doctrine of quasi-estoppel, which “appeals to

the conscience of the court to prevent injustice by precluding a party from

asserting a right inconsistent with a position previously taken by him.”

Willard v. Ward, 

, 443 (Okla. Civ. App. 1994). Mr. Bryer

insists that ConocoPhillips is trying to assert a right (the statute-of-

limitations defense) that is inconsistent with its previous position (its

longstanding denial that the refinery caused cancer). According to Mr.

Bryer, it is inconsistent for ConocoPhillips to deny that its refinery causes

leukemia and then say that Mr. Bryer should have known years earlier that

the refinery had caused his leukemia.

      The Oklahoma Supreme Court recognizes three circumstances in

which estoppel can be used to avoid a statute-of-limitations defense:

      1.    The defendant has made “‘some assurance of settlement
            negotiations reasonably calculated to lull the plaintiff into a
            sense of security and delay action beyond the statutory
            period.’”

      2.    The defendant has made “‘an express and repeated admission of
            liability in conjunction with promises of payment, settlement or
            performance.’”

      3.    The defendant has engaged in “‘any false, fraudulent or
            misleading conduct or some affirmative act of concealment to


                                       15
            exclude suspicion and preclude inquiry, which induces one to
            refrain from timely bringing an action.’”

Watkins v. Cent. State Griffin Mem’l Hosp., 

, 131 & n.18

(Okla. 2016) (quoting Jarvis v. City of Stillwater, 

, 472-73

(Okla. 1987)).

      Mr. Bryer cannot fit his facts into any of the three categories. To

avoid this difficulty, Mr. Bryer urges another form of estoppel, quasi-

estoppel. But Oklahoma’s “[e]xceptions to statutes of limitations are

strictly construed and are not enlarged on consideration of apparent

hardship or inconvenience.” Calvert v. Swinford, 

, 1033

(Okla. 2016). And the Oklahoma courts have never extended quasi-estoppel

to a statute-of-limitations case. Therefore, we decline to recognize a new

exception in Oklahoma to the statute of limitations. See Hogan v. Okla.

Dep’t of Corr., 

, at *2 (10th Cir. 1999) (unpublished)

(“Absent affirmative indication that the State of Oklahoma recognizes

equitable tolling in such a case, we decline to impute such a doctrine to the

state.”).

VI.   Conclusion

      We conclude that

           Mr. Bryer had sufficient information to bring his claim against
            ConocoPhillips more than two years before the filing of the
            complaint and

           the doctrine of quasi-estoppel does not apply.


                                     16
These conclusions render the complaint untimely, and we affirm the grant

of summary judgment to ConocoPhillips.

                                  Entered for the Court




                                  Robert E. Bacharach
                                  Circuit Judge




                                   17