Plaintiff Burlington Northern & Santa Fe Railway Co. (BNSF) appeals (Case No. 04-5182) the final judgment of the district court and additional interlocutory orders preceding final judgment. BNSF also appeals an order directing it to pay Defendants Charles Grant and the Charles Grant Revocable Trust (Grant) attorney fees (Case No. 04-5190). 1 Grant, in turn, *1018 cross-appeals the dismissal of his spoliation defense (Case No. 05-5137).
We exercise jurisdiction pursuant to 28 U.S.C. § 1291. In case numbers 04-5182 and 04-5190, we REVERSE and REMAND for further proceedings. In case number 05-5137, we AFFIRM.
I
A. Factual Background
This dispute centers around a tar-like material (TLM) that BNSF alleges moved onto its property from adjacent property owned by Grant. The property BNSF and Grant now own was once the location of an oil refinery which operated from 1917 until 1932. TLM was a waste by-product of the refinery’s operation.
BNSF’s property is located immediately east, and allegedly downhill, from Grant’s property. BNSF alleges that in the early 1970s Grant personally directed, or had reason to know of, substantial earth moving and construction on his property which BNSF alleges precipitated the migration of TLM onto its property. BNSF contends the migration of TLM has continued over a period of decades as a result of repeated heat expansion occurring each summer. BNSF investigated the TLM and methods for removing it from its property and undertook the removal and off-site disposal of the material in July 2001, expending a total of $469,000 on this project. BNSF also constructed a 2-3 foot berm on the property line to stop the alleged continued migration of TLM onto its property.
B. Procedural Background
BNSF brought suit against Grant seeking damages and injunctive relief asserting various legal theories, including claims under the citizen-suit provision of the Resource Conservation and Recovery Act (RCRA), 42 U.S.C. § 6972. BNSF also alleged the TLM was a public and private nuisance, and sought injunctive relief against Grant in the form of abatement, and damages for unjust enrichment as a result of BNSF’s cleanup activities.
The district court granted summary judgment in favor of Grant on several of BNSF’s claims. First, it found that BNSF had failed to present a genuine issue of material fact on the “imminent and substantial endangerment” element of its RCRA claim. 42 U.S.C. § 6972(a)(1)(B). Next, the district court concluded that BNSF could not proceed under Okla. Stat. tit. 27A, § 2-6-105(A), an Oklahoma public nuisance statute, because the Oklahoma Department of Environmental Quality (ODEQ) had not issued a prior clean-up order. Third, the district court held that BNSF failed to present a triable issue to obtain injunctive relief on its abatement claim because there was no present TLM migration, and because the court excluded as unreliable the testimony of BNSF’s expert regarding the likelihood of future migration.
BNSF proceeded to trial on its private nuisance and unjust enrichment claims. At the close of BNSF’s case-in-chief, the district court entered judgment as a matter of law for Grant on all remaining claims. Specifically, the district court held that Grant’s role in the construction activities of the 1970s did not subject him to personal liability because he was protected by the corporate shield. The district court also held that Grant could not be held personally liable as a successor landowner because BNSF never demanded that Grant abate the alleged TLM migration. As for BNSF’s claim of unjust enrichment, the district court held that BNSF failed to establish that it had discharged an affirmative duty for which Grant was responsible.
*1019 Alternatively, the district court dismissed all of BNSF’s remaining claims on the ground that it had failed to set forth evidence of its damages. Specifically, the district court entered judgment as a matter of law in favor of Grant because it found that BNSF failed to prove the diminution in value that its property suffered as the result of the alleged TLM migration. Further, the district court held that BNSF’s proof of damages was deficient because it failed to identify what costs it had expended within the applicable statute of limitations.
The district court also made various evi-dentiary rulings which limited the evidence BNSF could introduce at trial. Specifically, the district court excluded the expert opinion of BNSF’s expert Robert Brown-lee (Brownlee), who would testify that TLM migrated from Grant’s property onto BNSF’s property. The district court also excluded various photographs and visual descriptions which BNSF proffered to address the alleged TLM migration. Finally, after the entry of judgment as a matter of law, the district court awarded Grant $411,218.99 in attorney fees.
II
BNSF appeals the district court’s grant of summary judgment on its RCRA, abatement and public nuisance claims. BNSF also appeals the district court’s judgment as a matter of law on its private nuisance and unjust enrichment claims, several of the district court’s evidentiary rulings, and the district court’s order awarding Grant attorney fees. Grant, in turn, cross-appeals the district court’s dismissal of its spoliation claim.
A. Summary Judgment
We review the district court’s grant of summary judgment
de novo,
viewing the evidence in the light most favorable to the non-moving party.
See Roberts v. Printup,
1. RCRA
BNSF sought relief under RCRA, a comprehensive environmental statute designed to make certain that solid and hazardous wastes are not disposed of in a manner harmful to the public health or the environment. See 42 U.S.C. § 6902(a). To meet these objectives, RCRA regulates the generation, handling, treatment, storage, transportation, and disposal of solid and hazardous wastes. See 42 U.S.C. §§ 6922-25. To ensure enforcement of these provisions, Congress conferred enforcement power upon affected United States citizens. RCRA’s citizen-suit provision, 42 U.S.C. § 6972(a), provides:
[ejxcept as provided in subsection (b) or (c) of this section, any person may commence a civil action on his own behalf-
[1](B) against any person, including the United States and any other governmental instrumentality or agency, to the extent permitted by the eleventh amendment to the Constitution, and including any past or present generator, past or present transporter, or past or present owner or operator of a treatment, storage, or disposal facility, who has contributed or who is contributing to the past or present handling, storage, treatment, transportation, or disposal of any solid or hazardous waste which may present an imminent and substantial endangerment to health or the environment!.]
*1020 42 U.S.C. § 6972(a)(1)(B) (emphasis added).
Section 6972(a)(1)(B), requires: (1) the defendant must be a person, including, though not limited to, one who was or is a generator or transporter of solid or hazardous waste, or one who was or is an owner or operator of a solid or hazardous waste treatment, storage, or disposal facility; (2) that this defendant contributed to, or is contributing to, the handling, storage, treatment, transportation, or disposal of solid or hazardous waste; and (3) that such waste may present an imminent and substantial endangerment to health or the environment.
See, e.g., Cox v. City of Dallas, Tex.,
In this case, our focus is upon the “may present an imminent and substantial endangerment to health or the environment” language of § 6972(a)(1)(B). As a threshold matter, it is well established that the operative word in § 6972(a)(1)(B) is “may”; thus, BNSF must demonstrate TLM “may present” such a danger.
See Interfaith Community Organization v. Honeywell Int'l Inc.,
The Supreme Court has also held that the phrase “may present” communicates an additional idea, that is, it “quite clearly excludes waste that no longer presents” the harm contemplated by § 6972(a)(1)(B).
Meghrig v. KFC Western, Inc.,
Second, the term “endangerment” has been interpreted by courts to mean a threatened or potential harm, thus, it is not necessary that BNSF show proof of actual harm to health or the environment.
See Dague,
Third, the term “imminent” is not defined by RCRA, however, the Supreme Court has held that “[a]n endangerment can only be ‘imminent’ if it threatens to occur immediately[.]”
Meghrig,
Finally, the word “substantial” is not defined in RCRA or its legislative history. Nonetheless, relevant case law has held that an endangerment is “substantial” under RCRA when it is “serious.”
Interfaith,
Here, the district court found that the TLM removed from BNSF’s property and remaining on Grant’s property failed to satisfy the RCRA’s imminency requirement. The district court concluded immi-nency had not been established because (1) BNSF failed to point to any person who had been injured by TLM or to any study establishing the material threatened to “immediately” cause harm to a person or the environment, (2) neither the ODEQ or the Environmental Protection Agency (EPA) had ever ordered the TLM removed, and (3) BNSF monitored the alleged migration of the TLM onto its property for years without acting.
BNSF claims the district court’s rationale for entering summary judgment on this claim is erroneous. We agree. BNSF correctly points out that it is irrelevant when the TLM was deposited on the property and equally irrelevant how long BNSF monitored the TLM before acting.
See Parker,
*1022 We also conclude that there are genuine issues of material fact as to whether TLM “may present an imminent and substantial endangerment to health or the environment.” 42 U.S.C. § 6972(a)(1)(B). By way of example, various organizations, including the EPA, have generated reports over a number of years which have analyzed TLM samples taken from both on and near Grant’s property. Many of these reports indicate that TLM contains carcinogens in quantities greater than those suggested by the EPA. Perhaps the most pertinent of these studies is a 2003 report conducted at the behest of BNSF (the “ERM Report”) which analyzed samples of TLM removed from Grant’s property. The ERM Report states that the TLM sampled reveals the presence of certain contaminants which BNSF’s expert, Diane DeLillio, testified were present in levels exceeding EPA human health screening levels for industrial outdoor workers. DeLillio testified further that these contaminants were a cancer risk. Likewise, Brownlee testified that this TLM:
contain[s] elevated levels of known carcinogens in excess of current EPA Region 6 human health screening levels specific to industrial outdoor workers— soil concentrations. The materials also pose a threat to pets and wildlife as they are completely exposed. The presence of this material on the Grant property, which is threatening to recontaminate the BNSF property!),] is an imminent apd substantial health risk and endangerment to human health and the environment. The presence of this exposed material and its eruptive nature constitutes a potential threat to stormwater runoff and waters of the United States.
Appx. at 230.
Although Grant vigorously argues that Brownlee later retracted this testimony, we conclude that the record does not support such a reading. We also reject Grant’s arguments asking us to weigh the credibility of Brownlee’s testimony.
Anderson v. Liberty Lobby, Inc.,
2. Abatement
BNSF next argues that the district court erred in dismissing its claim for in-junctive relief seeking removal of the TLM from Grant’s property to prevent its future migration. As a threshold matter, we resolve two issues raised by Grant. First we conclude that this issue has been properly preserved for appeal. Second, it is well-established that we review the district court’s dismissal of BNSF’s claim at the summary judgment stage
de novo
and not, as Grant suggests, for clear error.
See Roberts,
We conclude that the district court erred in dismissing BNSF’s claim for in-junctive relief. To the extent the district court read Oklahoma law to require an ongoing TLM migration as a prerequisite to a plaintiffs obtaining injunctive relief, it erred as a matter of law. Under Okla
*1023
homa law, injunctive relief is proper upon a showing that there is a reasonable probability that the injury sought to be prevented will occur if no injunction is issued; a mere fear or apprehension of injury is insufficient.
See Sharp v. 251st Street Landfill, Inc.,
We also agree with BNSF that there are genuine issues of material fact remaining. In Oklahoma, entitlement to injunctive relief must be established by clear and convincing evidence and the injury alleged must not be speculative.
Thomas v. Hampton,
When applying this standard to the record presented, we conclude that BNSF’s evidence was sufficient to create a triable issue as to whether there is a reasonable probability that TLM on Grant’s property will migrate onto the property of BNSF. First, BNSF’s experts, Hurley and Brown-lee, unambiguously assert that the TLM has continued to move towards the berm, and against it, and that, absent intervention, it threatens to overtop the berm. Next, BNSF points to considerable evidence in the record of past TLM migration onto BNSF’s property, an issue which the district court did not resolve and about which there is vigorous dispute. Third, BNSF also points to studies of soil borings which show substantial remaining TLM deposits near the berm. Finally, both BNSF’s and Grant’s experts set forth the mechanics of TLM migration: heat, expansion, and settling to the lowest elevation. Taken together, we agree that this evidence — suggesting past TLM migration, current TLM migration against the berm, ample quantities of TLM next to the berm, and the mechanics of TLM migration— presents a triable issue as to whether there is a reasonable probability that the TLM on Grant’s land will overtop the berm and contaminate BNSF’s land. Accordingly, we reverse the district court and remand this issue for further proceedings on the abatement issue.
3. Public Nuisance
The district court granted summary judgment in favor of Grant on BNSF’s public nuisance claim brought pursuant to Okla. Stat. tit. 27A, § 2-6-105 of the Oklahoma Environmental Quality Code based upon its conclusion that an ODEQ enforcement action was a precondition to the existence of a public nuisance. On appeal, BNSF argues that the district *1024 court misread § 2-6-105 in reaching this conclusion. We agree.
Section 2-6-105 states:
A. It shall be unlawful for any person to cause pollution of any waters of the state or to place or cause to be placed any wastes in a location where they are likely to cause pollution of any air, land or waters of the state. Any such action is hereby declared to be a public nuisance.
B. If the Executive Director finds that any of the air, land or waters of the state have been, or are being, polluted, the Executive Director shall make an order requiring such pollution to cease within a reasonable time, or requiring such manner of treatment or of disposition of the sewage or other polluting material as may in his judgment be necessary to prevent further pollution. It shall be the duty of the person to whom such order is directed to fully comply with the order of the Executive Director.
Okla. Stat. tit. 27A, § 2-6-105.
We review a district court’s statutory interpretation under a
de novo
standard.
Ward v. Allstate Ins. Co.,
We conclude that the district court erred in holding that ODEQ enforcement action was a precondition to the existence of a public nuisance. To begin with, the language of Okla. Stat. tit. 27A, § 2-6-105 is unambiguous. Nothing in the plain language of Okla. Stat. tit. 27A, § 2-6-105 requires an order by the Executive Director of the ODEQ before an act can be declared a public nuisance. Nothing in subsection B purports to limit the scope of subsection A’s definition of the term “public nuisance.”
See Cox v. State ex rel. Okla. Dep’t of Human Servs.,
Subsection A states, in part, that “[i]t shall be unlawful for any person to cause pollution of any waters of the state or to place or cause to be placed any wastes in a location where they are likely to cause pollution-” Okla. Stat. tit. 27A, § 2-6-105(A) (emphasis added). We view subsection A as a declaration of the type of conduct that constitutes a public nuisance under Oklahoma law, and it is clear that the intent of subsection A is to deem as a public nuisance conduct that either has caused or is likely to cause pollution. Accordingly, pollution need not have already occurred before conduct “likely to cause” pollution can be deemed a public nuisance. Subsection B, on the other hand, demonstrates that the Executive Director’s authority under this section is more limited. It states, in part, that “[i]f the Executive Director finds that any of the air, land or waters of the state have been, or are being polluted, the Executive Director shall make an order requiring such pollution to cease.... ” Okla. Stat. tit. 27A, § 2-6-105(B) (emphasis added). The function of subsection B, therefore, is to direct the Executive Director of ODEQ to order *1025 abatement of pollution where it has already occurred.
The district court’s reading of subsection B to effectively limit subsection A would mean that the placement of “any wastes in a location where they are likely to cause pollution” could never be a public nuisance because subsection B requires the pollution to have occurred before the Executive Director of the ODEQ can act to abate the nuisance. This reading contradicts the plain language of Okla. Stat. tit. 27A, § 2-6-105.
See Villines v. Szezepanski,
Furthermore, the district court’s reading also belies the legislative intent behind Okla. Stat. tit. 27A, § 2-6-105. The Oklahoma Legislature’s intent that conduct that causes or is likely to cause pollution be declared a public nuisance is longstanding, and predates the enactment of the present subsection B. In fact, Okla. Stat. tit. 82, § 926(A), from which Okla. Stat. tit. 27A, § 2-6-105(A) was derived, had almost identical language. 2 Notably, Okla. Stat. tit. 82, § 926.4 did not contain a parallel to Okla. Stat. tit. 27A, § 2-6-105(B). We agree with the amici that to conclude, upon adoption of § 926.4 and its relocation to § 2-6-105, that the Oklahoma Legislature intended to depart from its prior position, and to now require an ODEQ order before conduct could be declared a public nuisance, would call for a clearer linguistic signal than mere silence.
We reach a similar conclusion when considering the purpose of the entire code. Okla. Stat. tit. 27A, § 2-3-506(A) states, in pertinent part, that:
[i]t is the purpose of this Code to provide additional and cumulative remedies to prevent, abate and control pollution. Nothing contained in this Code shall be construed to abridge or alter rights of action or remedies under the common law or statutory law, criminal or civil; nor shall any provision of this Code, or any act done by virtue thereof, be construed as estopping the state, or any municipality or person in the exercise of their rights under the common law to suppress nuisances or to abate pollution. Nothing in this Code shall in any way impair or affect a person’s right to recover damages for pollution.
Okla. Stat. tit. 27A, § 2-3-506(A). To require an order of abatement from the Executive Director of the ODEQ as a precondition to asserting a public nuisance claim under Okla. Stat. tit. 27A, § 2-6-105, not only undercuts the “additional and cumulative remedies” the code is intended to provide, but also precludes an action to “prevent” pollution under this section and would “impair or affect a person’s right to recover damages for pollution,” contrary to the express intent of the Legislature.
See
Okla. Stat. tit. 27A, § 2-3-506(A). This result would violate the maxim of statutory construction that “[w]hen possible, different provisions must be construed together to effect an harmonious whole.”
Villines,
B. Judgment as a Matter of Law
BNSF next challenges the district court’s entry of judgment as a matter of law on its private nuisance and unjust enrichment claims. We review a district court’s judgment as a matter of law
de
*1026
novo,
applying the same legal standards used by the district court.
Knowlton v. Teltrust Phones, Inc.,
1. Personal Liability
BNSF first argues that Grant, the individual, may be held liable to the extent he was responsible for the maintenance of a nuisance that was under his possession or control. This is an accurate statement of Oklahoma law.
See Branch v. Mobil Oil Corp.,
Nevertheless, BNSF’s next argument, that Grant may be held personally liable as a successive owner, is more convincing. Okla. Stat. tit. 50, § 5 provides “[e]very successive owner of property who neglects to abate a continuing nuisance upon, or in the use of such property, created by a former owner, is liable therefor in the same manner as the one who first created it.” This section provides for liability of successor owners who have or should have knowledge of the existence of the nuisance and of its liability to cause injury.
Union Texas Petroleum Corp. v. Jackson,
We conclude that there is sufficient evidence in this record to submit to a jury the question of whether Grant, as an individual, had constructive or actual knowledge that the TLM on his property constituted a nuisance to BNSF. This evidence ranges from Grant’s stipulation that he was aware of the existence of TLM on his property when he took title to it, to evidence that TLM incursions were open and notorious, in that there is sworn testimony that TLM emerging from Grant’s land pushed down a fence between the properties in question and caused a utility pole to list. Thus, while there is not sufficient evidence in the present record to establish Grant’s personal liability as a corporate officer, there is sufficient evidence to put before a trier of fact the question of whether Grant was on actual or constructive notice that the TLM on his property constituted a nuisance to BNSF.
2. Damages
BNSF next challenges the district court’s determination that it failed to submit a triable issue on the question of damages. Specifically, BNSF disputes the district court’s holding that damages for a continuing temporary nuisance are limited to the diminution in value of the property *1027 in question. However, assuming that diminution in value is indeed the limit on damages recoverable, BNSF next argues that the district court erred in requiring BNSF to carry the burden of proving the amount of that lost value. Finally, BNSF contends that the district court erred in concluding BNSF had failed to prove that its damages were incurred within the applicable two-year limitations period.
a. Measure of Damages
First, BNSF asserts that the amount of damages it may recover for nuisance is the total of the reasonable costs it incurred in attempting to minimize the loss with which it was threatened. We disagree.
“Damage” or “injury,” as typically used in nuisance cases, is the damage or injury resulting from the nuisance. Permanent damages, as well as temporary damages, may be recovered for the maintenance of a temporary nuisance.
Briscoe v. Harper Oil Co.,
As for temporary injury to land, the measure of damages is well-established.
Schneberger v. Apache Corp.,
The district court was correct in holding that BNSF can only recover the costs of removing the TLM
if
its restoration costs do not exceed the diminished value of the land. BNSF, in effect, is requesting that we carve out an exception and hold that where restoration costs have been expended prior to the institution of suit, the measure of damages should be the full cost of restoration. BNSF cites no authority from this circuit or from Oklahoma case law which supports its view. Instead, it attempts to distinguish existing precedent by arguing that the cases relied upon by the district court,
Schneberger,
b. Burden of Proof
Next, BNSF argues that even if the diminution in market value is the upper limit for temporary damage to property, the district court improperly allocated the burden of proof to BNSF. We agree.
While it is true a plaintiff must prove all elements of a claim, including damages,
Wilcox Oil Co. v. Walters,
c. Statute of Limitations
BNSF next argues that the district court erred in holding that it failed to prove its damages were incurred within the applicable limitations period as regards its state law claims. On this issue, we conclude part of BNSF’s damages were incurred within the applicable period, but some were not.
Under Oklahoma law, the damages recoverable for a continuing temporary nuisance — alleged here by BNSF— are limited to injuries incurred within the two years immediately preceding the filing of the lawsuit.
Branch,
The statute of limitations for the filing of a nuisance action begins when the injury is complete.
Id.
(citing
Elk City v. Rice,
As noted above, one aspect of damages the “victim” of a temporary nuisance can recover “is the cost of restoring the land to its former condition ... if this altogether is less than the diminution in value with the injuries left standing.”
Houck,
Nonetheless, Grant is correct to point out that BNSF is not entitled to the costs of removing all TLM on its land simply by performing that removal within a two-year period prior to filing suit, regardless of whether such a clean-up addresses injuries that occurred outside the limitations period. In other words, BNSF can only recover removal costs for the approximately four months of TLM migration between March and July of 2001, because that is the only time period falling within the two-year statute of limitations. To permit BNSF to recover for the removal of all the TLM on its property would, in effect, negate the statute of limitations, as BNSF would then be able to recover for decades of TLM migration. However, because Oklahoma law allows a plaintiff to recover its costs of abatement in a temporary nuisance action, the district court erred in holding that BNSF failed to set forth measurable evidence of damages.
See, e.g., Tenneco Oil Co.,
In short, while the district court identified the correct measure of damages, it erred in placing the burden on BNSF to prove the limit of damages recoverable. The district court further erred in dismissing BNSF’s remaining claims as falling outside of the statute of limitations. We reverse the district court’s dismissal of BNSF’s private nuisance claim and we remand for further proceedings.
S. Unjust Enrichment
The district court dismissed BNSF’s unjust enrichment claim, holding that it had failed to establish an affirmative duty on the part of Grant which he would have been required to perform but for BNSF’s performance of the same. 3 BNSF argues that our reversal of the district court’s rulings on its public or private nuisance claims would necessitate a reinstatement of its unjust enrichment claim. We agree.
*1030
In
N.C. Corff P’ship, Ltd. v. Oxy USA, Inc.,
[A] right of recovery under the doctrine of unjust enrichment is essentially equitable, its basis being that in a given situation it is contrary to equity and good conscience for one to retain a benefit which has come to him at the expense of another.... [It] arises not only where an expenditure by one person adds to the property of another, but also where the expenditure saves the other from expense or loss.
(quoting Am.Jur.2d Restitution and Implied Contracts § 3 (1973)). To recover for unjust enrichment “there must be enrichment to another coupled with a resulting injustice.”
Teel v. Public Serv. Co. of Okla.,
Grant, in turn, argues that because BNSF already has legal claims that will cover the relief sought, its additional claim for unjust enrichment is prohibited. However, Oklahoma courts have squarely rejected this argument.
N.C. Corff P’ship, Ltd.,
C. Evidentiary Rulings
BNSF also argues that the district court erred in excluding certain testimonial and documentary evidence. Specifically, the district court granted, without explanation, Grant’s motion to exclude Brownlee’s expert opinion that the TLM BNSF had removed was TLM that had migrated from Grant’s property. The district court also excluded Brownlee’s testimony regarding TLM he had personally viewed on the properties in question. BNSF was also prohibited from presenting photographs it asserts illustrate TLM migration.
1. Exclusion of Brownlee’s Testimony
As for the district court’s decision to exclude Brownlee’s expert opinion, we note that when “[fjaced with a proffer of expert scientific testimony ... the trial judge must determine at the outset ... whether the expert is proposing to testify to (1) scientific knowledge that (2) will assist the trier of fact to understand or determine a fact in issue.”
Daubert v. Merrell Dow Pharmaceuticals, Inc.,
*1031
The trial court has the discretion to determine how to perform its gatekeep-ing function.
See Kumho Tire Co., v. Carmichael,
Here, the district court failed to make any findings on the record in support of its exclusion of Brownlee’s expert testimony. However, Grant argues that a review of the record of the two-day Daubert hearing reveals flaws in Brownlee’s methodology and expert opinion that are so patent and obvious that we may have a sufficient record upon which to review the district court’s decision to exclude Brownlee’s opinion testimony regarding the migration of the TLM. 4 We disagree. What Grant is essentially asking us to do is to infer that the district court properly performed its gatekeeping function based on the few statements it made and questions it asked during the Daubert hearing. This we are unwilling to do. In the absence of findings by the district court to support its ruling to exclude this evidence, we cannot determine whether it applied the relevant law and properly performed its gatekeeping function. Accordingly, we reverse the district court’s ruling on this issue and remand for further proceedings.
As regards the district court’s exclusion of Brownlee’s testimony concerning his personal observation of the TLM on the properties in question, we affirm. Although the exclusion of Brownlee’s lay testimony is listed among the issues BNSF seeks to appeal, it has failed to provide arguments or authorities in support of this issue. We will not review an issue in the absence of reasoned arguments advanced by the appellant as to the grounds for its appeal.
Antonio v. Sygma Network, Inc.,
2. Photographs
As for the district court’s decision to exclude photographs BNSF sought to offer as evidence, we are unable to address this issue on the record provided because the copies of the photographs in question are of such poor quality they are impossible to scrutinize in any meaningful manner. Because we cannot review this issue on the record before us, we affirm the district court.
See Scott v. Hern,
D. Spoliation
After receiving extensive briefing, and after holding a two day hearing, the dis *1032 trict court entered an order, without analysis, denying Grant’s motion for spoliation sanctions. Grant appeals this ruling in the event the district court’s judgments appealed by BNSF are reversed, arguing that the district court erred both factually and legally in denying its motion for spoliation sanctions.
As a threshold matter, BNSF argues that this cross-appeal is improper because cross-appeals are to be dismissed where they merely present an alternate grounds for affirmance, but do not ask that the judgment be altered in any way.
See, e.g., Jarvis v. Nobel/Sysco Food Serv. Co.,
We review a district court’s denial of a motion for spoliation sanctions for an abuse of discretion.
103 Investors I, L.P. v. Square D Co.,
Grant’s arguments are fourfold. First, Grant argues that the district court erred as a matter of law by concluding that the spoliation doctrine does not apply in cases involving the destruction of an alleged nuisance. Second, Grant argues that the district court erred insofar as it concluded that a finding of bad faith was a necessary prerequisite to a finding that spoliation occurred. Third, Grant claims that the district court clearly erred by failing to find that BNSF breached a duty to preserve evidence gathered in anticipation of litigation. Finally, Grant claims that the district court clearly erred by failing to find that this alleged destruction of evidence was prejudicial to his defense.
Upon review of the record, and upon consideration of the parties’ briefs, we conclude that no reasonable finder of fact could determine that Grant was meaningfully prejudiced by BNSF’s removal and destruction of portions of the TLM on its property. 5 The gravamen of Grant’s argument regarding prejudice is that he cannot defend this lawsuit because BNSF’s clean-up altered the topography and slope of the land, and prevented him from having the alleged TLM migration measured scientifically. 6 We reject this claim. BNSF generated extensive documentation of the condition of the land before and during remediation, and the factual dispute regarding any change in elevation of the remediation site amounts to, at most, one and a quarter inches. In light of this, and absent meaningful evidence that Grant has been *1033 actually, rather than merely theoretically, prejudiced, we affirm the district court’s denial of Grant’s motion for spoliation sanctions.
Ill
In sum, we conclude that the district court erred in dismissing BNSF’s RCRA, public nuisance, and abatement claims at the summary judgment stage. We further conclude that the district court erred in entering judgment as a matter of law as to BNSF’s private nuisance and unjust enrichment claims. In light of these holdings, we vacate the district court’s order awarding Grant attorney fees. We also affirm the district court’s denial of Grant’s motion for spoliation sanctions.
Accordingly, we REVERSE the district court’s rulings in 04-5182 and 04-5190 and REMAND for further proceedings. As for case number 05-5137, we AFFIRM the district court.
Notes
. Unless otherwise noted, “Grant” includes both Grant the individual and the Charles Grant Revocable Trust. For ease of reference, the pronoun "he” is used to describe the inclusive form of "Grant.”
. Okla. Stat. tit. 82, § 926.4(A) (West 1990) read: "It shall be unlawful for any person to cause pollution as defined in Section 1 of this act of any waters of the state or to place or cause to be placed any wastes in a location where they are likely to cause pollution of any waters of the state. Any such action is hereby declared to be a public nuisance."
. We reject as untenable Grant's argument that this issue is subject to a clearly erroneous standard of review because the district court, in dismissing this claim pursuant to Rule 50 of the Federal Rules of Civil Procedure, was somehow making sub rosa findings of fact under Rule 52(b).
. Brownlee’s credentials were stipulated to and are not at issue.
. We therefore decline to address the remainder of Grant’s arguments on this issue.
. We also find unconvincing Grant’s argument that it was prejudiced because its appraisal expert was unable to observe the TLM site, due to BNSF’s remediation, and establish how much BNSF’s land was allegedly devalued.
