OPINION OF THE COURT
These related appeals involve a multi-party insurance dispute arising from a polluted oil transfer terminal, “Tankport,” which sits on the western shore of upper New York Harbor in Jersey City, New Jersey. Appellants Ultramar America Limited and Ultramar Petroleum, Inc. (collectively “Ultramar”) purchased Tankport from Appellant The Pittston Company (“Pittston”). As part of the purchase agreement, Pittston agreed to indemnify Ultramar for any environmental damage caused during Pittston’s ownership of Tankport. Ultramar has since decommissioned Tankport and faces extensive environmental remediation costs. Although Ultramar and Pittston have settled the question of liability between them, they each seek relief from their respective insurance carriers. The district court granted summary judgment in favor of the insurers on all of Ultramar’s claims and most of Pittston’s claims.
On appeal, there are two primary questions before us. First, are Ultramar’s and Pittston’s claims for insurance coverage barred by the doctrine of known loss? Second, do Pittston’s marine insurance policies preclude coverage for land-based pollution? We will conclude that both of the above questions should be answered in the negative. Accordingly, we will reverse.
The factual background of this ease is set out thoroughly in the district court’s extensive opinion. See Pittston Co. v. Allianz Ins. Co., 905 F.Supp. 1279 (D.N.J.1995). Here, we will repeat only those facts necessary to resolve these appeals.
In 1954, Pittston purchased the facility now known as Tankport from Standard Oil Company. Standard Oil had operated the facility as part of its “Eagle Works” petroleum refinery, but the facility had not been operating since the 1930s. When Pittston acquired ownership of the facility, it renamed it “Tankport” and began to operate it as an oil storage and transfer facility. Oil was brought in by barge to an attached pier, pumped from the barges through pipelines, and stored in tanks on the property. The oil was then pumped from the tanks into tank trucks for delivery to customers.
Tankport is located on a very low piece of land, which at places, is within inehes of or below the water table. A creek, known as Caven Creek, runs along one side of the property. As the district court stated, the very large volume of oil processed and transshipped through Tankport, combined with the “rudimentary or non-existent environmental safeguards that characterized the industry early this century” undoubtably caused “significant environmental degradation” prior to Pittston’s purchase of the site. Pittston,
Beginning in 1961, Pittston purchased a series of Comprehensive General Liability (“CGL”) policies from Travelers Indemnity Company that covered all of its operations, including Tankport. In 1971, the CGL policies began to include pollution exclusion clauses, which were standard practice in the insurance industry. Beginning in 1978, Pitt-ston purchased a series of Comprehensive Marine Liability Package (“CMLP”) policies from the Appellees Marine Insurers (“CMLP Insurers”).
Pittston alleges that, throughout its tenure at Tankport, the site’s oil tanks were subject to routine maintenance and cleaning. During that time, however, three major spills occurred. First, in 1976, a pipe coupling broke during the transfer of oil and 291,000 gallons spilled into a containment dike around a tank. Pittston notified federal and state officials, and Pittston officers testified that they cleaned up the spill and disposed of the contaminated soil. The second major spill occurred in 1980, when 200 gallons of oil spilled onto the ground. Pittston provided evidence that authorities were notified and that an outside contractor cleaned up the spill. Finally, sometime between 1981 and 1983, Pittston discovered that one tank was losing oil. After discovering the leak, Pitt-ston apparently dug trenches to collect the oil and removed it by vacuum trucks, absorbent pads and oil booms. In addition, during the excavation to find the leak, workers discovered pipelines that had been abandoned by the former owner of the property. Pitt-ston offered testimony to show that it had engaged in the appropriate remedial conduct, such as draining and removing the abandoned pipelines.
Importantly, Pittston maintains that although it was the subject of repeated inspection from regulatory authorities, no demand or claim was ever made on it involving environmental damage at Tankport, beyond the Coast Guard’s issuance of “minor penalties” for accidental spills. By 1979, however, Pittston was sufficiently concerned about Tank-port’s future that it commissioned a pollution study from Environies, an environmental firm. That study confirmed that Tankport was “substantially contaminated with oil in excess of regulatory allowances.” Pittston,
On April 30, 1983, Ultramar acquired Tankport through a stock purchase of Pitt-
Ultramar alleges that it had, at best, only sketchy and limited information of contamination at Tankport at the time the insurance policies were purchased. According to Ul-tramar, prior to purchasing Pittston Petroleum, its representatives made a brief visit to Tankport where they were told of a minor groundwater problem that Pittston was “taking care of.” Ultramar claims it undertook no further environmental study of Tankport until after the insurance policies at issue were purchased.
Ultramar briefly operated a fuel storage terminal at Tankport and, in 1984-85, Ultra-mar commissioned an environmental study of Tankport by the Killam Company, an independent consultant. Ultramar closed the site for good in 1985 and filed a submission indicating its intent to decommission the site pursuant to the New Jersey Environmental Cleanup Responsibility Act (“ECRA”).
Thereafter, the New Jersey Department of Environmental Protection (NJDEP) asserted claims against Ultramar for chromium contamination of the soil at Tankport. In 1988, Ultramar filed suit against Pittston under the stock purchase agreement’s indemnification provision. That suit has been settled and is not at issue here. But in August of 1989, Ultramar circulated a draft amended complaint in the chromium litigation alleging that Pittston was also liable to it for clean-up costs associated with petroleum contamination.
By letter dated April 4,1990, Pittston notified Travelers, its CGL insurer, of Ultra-mar’s claim and forwarded a proposed settlement agreement. The letter requested a quick decision on coverage because of pending motions in the Ultramar suit. On April 9, 1990, Pittston and Ultramar settled the claim, with Pittston agreeing to pay 80% and Ultramar agreeing to pay 20% of the total clean-up costs. Three days after the settlement, Travelers sent a letter waiving objection to the settlement but reserving its other rights to dispute coverage. Pittston’s insurers then denied coverage.
On August 10, 1990, Pittston filed suit against its various insurers in New Jersey Superior Court for declaration of coverage. The insurers removed the ease to the United States District Court for the District of New Jersey pursuant to 28 U.S.C. § 1441(d). Ul-tramar then joined the suit as a plaintiff-intervenor seeking declaration of coverage on its CMLP policy.
With regard to Pittston’s claims, the district court granted summary judgment in favor of the CMLP Insurers.
With regard to Ultramar’s claims, the district court granted summary judgment in favor of the insurers on the basis of the known loss doctrine. Although the district court refused to grant summary judgment on Ultramar’s CMLP policy on the basis of the language of the policy, the district court concluded that coverage was nevertheless barred on the basis of known loss.
On November 17, 1995, the district court denied Ultramar’s and Pittston’s motions for reconsideration.
Ultramar appeals the district court’s finding that although Ultramar’s policies may have provided coverage for environmental remediation, coverage was nonetheless barred by the known loss doctrine. Pittston appeals the district court’s finding that Pitt-ston’s CMLP policies could not be interpreted, as a matter of law, to include coverage of strictly land-based activities. Pittston also appeals the district court’s alternative “known loss” basis for granting summary judgment in favor of the CMLP Insurers.
The district court had jurisdiction pursuant to 28 U.S.C. § 1330 and § 1441(d). We have jurisdiction pursuant to 28 U.S.C. § 1291.
II.
Our review of a district court’s grant of summary judgment is plenary. Oritani Sav. & Loan Assoc. v. Fidelity & Deposit Co. of Md.,
Moreover, we have plenary review over a district court’s interpretation of state law, Chemical Leaman Tank Lines, Inc. v. Aetna Cas. & Sur. Co.,
III.
A. Are Ultramar’s Claims Barred Under the “Known Loss”Doctrine?
The known loss doctrine is a common law concept that derives from the fundamental requirement of fortuity in insurance law.
Unfortunately, we do not know how broadly or narrowly the New Jersey Supreme Court would construe the doctrine because it has not yet resolved this issue. Accordingly, we must do our best to predict how it would do so. New Castle County,
With that in mind, we will start by discussing Astro Pak Corp. v. Fireman’s Fund Ins. Co.,
In 1990, Transtech sued Astro Pak and others, seeking recovery for past and future remediation costs. Astro Pak then sought coverage from its CGL insurers. The insurers argued that coverage was precluded by the known loss doctrine and the loss in progress doctrine.
The court began its analysis by noting that “no New Jersey opinion has applied either doctrine by name,” but that “federal eases and out-of-state cases recognize the doctrines and even state that the doctrines are applied in New Jersey in principle.” Astro Pak Corp.,
If the prevention of fraud is at the heart of these rules, the “loss” must relate to a known occurrence that would trigger indemnification by the insurer. Only if [As-tro Pak] knew that its acts had already subjected it to potential liability because of leakage into the surrounding land, water or air, would the insurers have a claim to a defense____ The loss was still fortuitous here in that Astro Pak had not been aware of its own potential liability when the [insurance] policies were written.
Id. at 1116-17. Thus, Astro Pak’s awareness that the landfill was closed due to possible contamination was not sufficient to create a presumption of actual or constructive knowledge of its potential lability. Id. at 1117 (“It was not until years later that there was any lability claimed against Astro Pak such as this claim____ The fact that Astro Pak was aware that Kin-Bue was closed due to possible contamination in July 1976 does not equate with Astro Pak’s actual or constructive knowledge of an insured claim against Astro Pak.”). Finally, the court stressed that the statute on which the underlying labilty was based (CERCLA) had not yet been enacted and “Astro Pak was not even a named defendant” in the underlying legal action brought by the government. Id.
Both Ultramar and its insurers insist that Astro Pak supports their respective theories of the known loss doctrine. Ultramar contends that, under Astro Pak, the known loss doctrine does not apply “unless the insured knew that its acts had already subjected it to liabilty at the time it purchased the insurance polcies.” Moreover, relying on Astro Pak, Ultramar argues that “there can be no known loss where the basis for the underlying liability was a statute enacted after the policy period had begun.”
The insurers challenge this reading as unduly narrow, and counter that, by its express terms, Astro Pak requires knowledge of potential liability only, not actual liability. Thus, according to the insurers, Astro Pak cannot be read to require knowledge of the precise legal bases for liability in order for the known loss doctrine to apply. The insurers argue that, here, Ultramar knew that Tankport was contaminated before it acquired the facility and before it purchased the insurance policies. It follows, they claim, that Ultramar’s knowledge of Tankport’s contamination constituted knowledge of a known loss.
The district court agreed with the insurers, holding that coverage was barred by the doctrine of known loss. Rejecting Ultra-mar’s contention that notice of legal liability
While it is obvious that receipt of formal notice of legal liability for environmental damage would provide powerful, and possibly dispositive evidence of knowledge of the loss, it does not follow that this is the only way knowledge of the loss may be acquired. Cases that hold that the commencement of litigation means that the loss is known do not compel the conclusion that the loss may not become known earlier.
Pittston,
[A] polluter who believes it is disposing of waste properly, only to become subject to liability pursuant to a later change in the law that dramatically extends the circle of responsibility, see, e.g., Astro Pak, might not have notice of the loss until formal notice was received.
Id.
We disagree with the district court’s interpretation of Astro Pak. In our view, Astro Pak supports Ultramar’s theory of the known loss doctrine — that certainty of legal liability, rather than certainty of damage, is required to trigger application of the doctrine. We reach this conclusion despite the fact that Astro Pak indicated that “knowledge of potential liability because of leakage into the surrounding land, water or air” might allow the insurers to assert the known loss defense. Astro Pak,
Here, the district court equated Ultramar’s knowledge of the extensive contamination at Tankport with knowledge of a known loss. While we recognize the allure of the district court’s “common sense observation” that “some harm so clearly will result in legal liability that knowledge of the harm may be presumed to constitute knowledge of the insured liability,” Pittston,
We think the better rule, and the one likely to be adopted by the New Jersey Supreme Court, is that the known loss doctrine will bar coverage only when the legal liability of the insured is a certainty. Thus, we adopt the rule set forth by the Supreme Court of California that the known loss doctrine “will not defeat coverage for a claimed loss where it had yet to be established, at the time the insurer entered into the contract of insurance with the policyholder, that the insured had a legal obligation to pay damages to a third party in connection with a loss.” Montrose Chem. Corp. of Cal. v. Admiral Ins. Co.,
Moreover, we note that this narrow interpretation of the known loss rule would avoid the problem identified by the Second Circuit in City of Johnstown, NY,
Applying this theory of the known loss doctrine to Ultramar’s claim, we conclude that the doctrine will not bar coverage under either its CGL or CMLP policies. Ultramar did not receive notice of any legal liability until December of 1989, some six years after it purchased the insurance policies. ' Moreover, the statute pursuant to which liability was imposed, ECRA, was not enacted until after the policies were issued. Finally, the insurers have not alleged that Ultramar misrepresented or wrongfully withheld information regarding the condition of the Tankport site. As such, we hold that Ultramar had a legitimate insurable risk and, thus, coverage is not barred by the doctrine of known loss.
B. Does the Architecture of Pittston’s CMLP Policies Preclude Coverage for Contamination at Tankport?
Pittston contends that the plain language of the CMLP policies covers Pittston’s environmental liability to Ultramar arising out of contamination at Tankport. Specifically, Pittston alleges that two sections of the policies insure this liability: Part One, Section Two, and the “Terminal Operators” provision in Part Two, Section B.
All of the marine policies are structured in two parts, as follows:
Part I General Policy Terms and Conditions and Insuring Agreements
Part II Specific Policy Terms and Conditions and Insuring Agreements relative to:
A) Charterer’s Liability
B) Wharfinger’s Liability
*520 C) Cargo Liability
D) Coverage on Owned Barges13
Vol. l.App. at 50.
Of primary importance in this appeal is Section Two of Part One, which provides in pertinent part:
This Policy is to cover any loss, damage liability and/or expense that the assured shall be liable to pay ... arising out of, or in consequence of, the actual and/or potential discharge, emission, spillage, or leakage upon or into the seas, waters, land or air, of oil, petroleum products, chemicals or other substances of any kind or nature whatsoever.
Vol.
Pittston argues that “the language of Part One, Section Two, standing alone, is broad enough to cover Pittston’s environmental liability to Ultramar.” Thus, according to Pith-ston, the district court’s reading of this provision is contrary to its plain meaning. In contrast, the district court held, sua sponte, that Part One, Section Two does not contain any grants of coverage, but only “defines the type and extent of coverage granted in” Part Two.
After a close reading of the plain language of the policies, consideration of their structure as a whole, and application of well-established rules of contract interpretation, the Court finds that the agreements are not ambiguous and that section two of part one clearly does not provide stand-alone pollution coverage.
Id. at 1319.
As the district court properly noted, the first step in examining an insurance contract is determining whether ambiguity exists. Oritani Sav. & Loan Assoc. v. Fidelity & Deposit Co. of Md.,
The focus on ambiguity in insurance contracts arises from the doctrine of contra proferentum. Under New Jersey law, contra proferentum requires any ambiguities in an insurance contract to be resolved in favor of the insured. See generally Kampf v. Franklin Life Ins. Co.,
The doctrine of contra proferentum is not without its limits, however, and its application to sophisticated insureds has been called into question. Compare Owens-Illinois, Inc. v. United Ins. Co.,
Read in conjunction, these cases indicate that the dispositive question is not merely whether the insured is a sophisticated corporate entity, but rather whether the insurance contract is negotiated, jointly drafted or drafted by the insured. In such instances, we conclude that the doctrine of contra prof-erentum should not be invoked to inure to the benefit of the insured.
Here, it is undisputed that Pittston hired an insurance broker, Sedgewiek James of New York, to secure marine insurance. The broker testified in his deposition that he prepared the initial draft of the policies and negotiated the terms with the insurers. See Supp.App. at 310-12. As such, we conclude that the CMLP policies were not contracts of adhesion and are more properly treated as traditional, jointly-negotiated contracts. Accord Oritani Sav. & Loan Assoc.,
This is not to say, however, that the threshold issue of whether the policies are ambiguous is unimportant. On the contrary, “[w]hen resolving a contract dispute, the initial determination is whether the contract is ambiguous____” Sumitomo Mach. Corp. of Am., Inc. v. AlliedSignal, Inc.,
Although-we agree with the district court that the “architecture” of the policies can be read to preclude stand-alone coverage, we also find it reasonable to interpret the language in part two of section one as granting such coverage. Thus, as will be explained further below, we conclude that the CMLP policies are ambiguous.
By its express terms, the language in Part One, Section Two grants coverage for "any loss, damage, liability and/or expense” incurred by Pittston because of the discharge of petroleum. Thus, according to Pittston, it does not provide coverage only for “any loss covered under Part Two” as the district court concluded. Moreover, Pittston argues, Part One, Section Two “does not have to be read in conjunction with the provisions of Part Two in order to have meaning: by its terms, it grants broad pollution coverage and sets out narrow exclusions from that coverage.”
We agree. While the district court states that it closely examined the plain language of the policies, the court did not indicate what if any “language” in the provision indicates that coverage under that section is limited to insuring the liabilities arising under the grants of coverage specified in Part Two of the policy. The omission of such language is significant, we think, because other provisions in Part One do contain limiting language. For example, Part One, Section Three provides: “Coverage hereunder includes legal fees and associated expenses in the defense of any claim that might be made hereon.” Vol.
We recognize that the district court used similar reasoning to come to the opposite conclusion. See Pittston,
The table of contents to the policies also lends support for Pittston’s interpretation. The titles of both Part One and Part Two contain the term “Insuring Agreements.” We agree with Pittston that the term “Insuring Agreements” implies coverage. As such, Pittston’s contention that, on its face, Part One contains both general conditions and grants of coverage is reasonable.
In determining that none of the provisions in Part One provided stand-alone coverage, the district court also relied on the policy’s preamble, which states: “Unless otherwise specified, the following terms and conditions are incorporated under all sections of the policy.” Pittston,
"While we do not gainsay the district court’s conclusion that expressio unius can aid in contract interpretation, we agree with Pittston that the principle of expressio unius is not violated by affording the language of the preamble its most natural meaning. In our view, the most natural meaning of the language “under all- sections of this policy” is that the “terms and conditions” are incorporated under “all sections” — that is, all sections of Parts One and Two — rather than solely under “all sections of Part Two.” This interpretation of the preamble would provide for all general “terms and conditions” to apply to all grants of coverage in Part One and Part Two.
Beyond its reliance on the language and architecture of the policies, the district court looked to extrinsic evidence to support its conclusion that the policies did not provide stand-alone pollution coverage. We have noted that “extrinsic evidence of the negotiations, conduct and other circumstances of the parties is important to a court’s analysis of whether an agreement is ambiguous only to the extent, if any, that such evidence provides ‘objective indicia that, from the linguistic reference point of the parties, the terms of the contract are susceptible of different meanings.’” American Cyanamid Co. v. Fermenta Animal Health Co.,
Accordingly, while we acknowledge that the court’s construction of the contract is reasonable, we conclude that Pittston’s construction is reasonable as well. Thus, Pitt-ston has established that the policies are ambiguous. As such, the district court’s entry of summary judgment, sua sponte, in favor of the insurers was inappropriate. See Sumitomo Mach. Corp. of Amer., Inc.,
C. Are Pittston’s Claims Barred by the “Known Loss” Doctrine?
In addition to holding that the CMLP policies do not provide coverage for remediation of Tankport, the district court stated: “For the reasons discussed below, the known loss theory would provide an alternative ground for dismissing the case against Pittston’s marine insurers.” Pittston,
We need not discuss Pittston’s known loss. argument, other than to say that for the reasons discussed above in part III.A., relating to the application of known loss to Ultra-mar’s claims, we conclude that the CMLP Insurers cannot assert the known loss doctrine against Pittston. It is undisputed that
IV.
For the foregoing reasons, we reverse the district court’s order granting summary judgment in favor of the CMLP Insurers and INA with respect to Ultramar’s claims on the basis of known loss. We also reverse the district court’s order granting summary judgment in favor of the CMLP Insurers with respect to Pittston’s claims on the basis of the policy language and the basis of known loss. On remand, the district court should allow the question of whether the CMLP policies provide pollution coverage to proceed to trial.
Notes
. There are four pending motions related to Pittston's appeal, No. 96-5167, which we will dispose of by separate order.
. The CMLP Insurers are: Allianz Insurance Co.; American Marine Underwriters; Ancon Insurance Co.; Chiyoda Fire & Marine Insurance Co.; Gibbs & Companies; Hartford Fire Insurance Co.; Lloyds Underwriters on FSJ-100-4/83; Rochdale Insurance Co.; Unigard Mutual Insurance Co.; Unione Italiana Reinsurance Co.; United Americas Insurance Co.; and Wausau. Pittston,
. The policy was underwritten by Hartford Insurance Co., Wausau, and Underwriters at Lloyds of London.
. Ultramar later filed an amended complaint-in-intervention asserting claims against INA, the carrier of its two CGL policies.
. The court denied summary judgment with respect to most of the CGL policies covered by Travelers. Pittston,
. Although the CMLP Insurers did not move for summary judgment based on the language of the policies, the district court entered summary judgment sua sponte on this basis.
. In refusing to grant summary judgment against Ultramar on the basis of the CMLP policy language, the court noted that "[t]he same rationale that supports the ruling [with regard to Pitlston's CMLP policies], the placement of the pollution clause in the contract, supports the insured's contention that moving the pollution clause to the specific terms and conditions part means that it was considered to provide stand-alone coverage.” Pittston,
.In its motion for reconsideration, Pittston argued for the first time that coverage was provided under the “terminal operators” provision of its CMLP policies. The district court rejected the argument, finding that "it adequately addressed and disposed of the issue on summary judgment.” Pittston, No. 90-3631, slip op. at 5 (order denying motion for reconsideration). Pittston raises that argument again on appeal.
. The known loss doctrine has a few variants, often referred to as the doctrines of "known risk” or “loss in progress.” In addition, it appears that those terms are often conflated or used interchangeably. See, e.g., City of Johnstown v. Bankers Standard Ins. Co.,
. Appellees Century Indemnity Company and INA argue, alternatively, that the district court’s judgment should be affirmed based on the "absolute pollution exclusion” contained in one of its policies in effect from June 30, 1982 to June 30, 1983. Because the district court granted the insurers’ summary judgment motion on the basis of known loss, it denied the motion based on the "absolute pollution exclusion” as moot. We will reverse the judgment of the district court on the basis of known loss. We will leave it to the district court to address on remand the “absolute pollution exclusion.”
. Because of our disposition of the known loss issue, we need not reach Ultramar’s alternative claim that the district court improperly drew inferences in favor of the insurers when making the factual determination that Ultramar knew of extensive petroleum contamination at Tankport prior to the inception of the insurance policies.
. As noted earlier, see supra note 8, Pittston did not argue that it was covered under the "terminal operators” provision of the insurance contract until it filed its Rule 59(e) motion for reconsideration. The district court rejected the argument summarily, assuring Pittston that it had adequately considered any possible claims for coverage under the CMLP policies on summary judgment. See Pittston, No. 90-3631, slip op. at 5 (order denying motion for reconsideration).
As we have noted, "[cjourts often take a dim view of issues raised for the first time in post-judgment motions.” Kiewit Eastern. Co., Inc. v. L & R Const. Co. Inc., 44 F.3d 1194, 1204 (3d Cir.1995). We take such a dim view here and, thus, decline to consider Pittston’s "terminal operators” argument on appeal. See "Weihaupt v. American Med. Assoc.,
. Later policies add two subsections to Part Two: E) Bailee and Warehousemen’s Liability; and F) Open Cargo. See Vol.
. The court acknowledged that it was "aware that only the insureds have moved for summary judgment on this issue,” but entered summary judgment for the insurers anyway because it was "already engaged in the task of determining whether there is an issue of fact” and "both parties ... had the opportunity to set forth their evidence on the issue.” Pittston,
