Ellington, Presiding Judge.
Plantation Pipe Line Company filed this action in the Superior Court of Fulton County against five of its excess liability insurers, including Columbia Casualty Company, seeking relief including a declaratory judgment as to each insurer’s respective share of Plantation’s losses arising from a pipeline leak. See Plantation Pipe Line Co. v. Stonewall Ins. Co., 335 Ga. App. 302 (780 SE2d 501) (2015), cert. denied April 26, 2016 (appeal by Plantation from order granting summary judgment in favor of another of Plantation’s excess liability insurers, Stonewall Insurance Company). Plantation and Columbia [557]*557filed cross-motions for summary judgment. The trial court granted Plantation’s motion and denied Columbia’s cross-motion. Columbia appeals both rulings, contending that the trial court erred in allocating all of Plantation’s losses to the policies that were in place at the time of the fuel leak, rather than allocating Plantation’s losses pro rata among the multiple, successive policies that were issued to Plantation over the thirty-year period during which the environmental contamination continued to accrue. When Plantation’s losses are properly allocated, Columbia contends, the losses attributable to the policy period of the Columbia policy as a matter of law did not reach the attachment point of the policy, which is a prerequisite to coverage under the policy For the reasons explained below, we affirm.
The record shows the following relevant undisputed facts.1 On April 2, 1976, Plantation employees discovered that turbine fuel had leaked from an underground Plantation pipeline located in Cabarrus County, North Carolina. Plantation Pipe Line Co. v. Stonewall Ins. Co., 335 Ga. App. at 303. Within 24 hours, Plantation repaired the pipeline and cleaned up the leak. Id. Without resorting to insurance, it compensated the only affected landowner $50. Id. More than 30 years later, on April 3, 2007, one of Plantation’s workers found contaminated soil during maintenance of Plantation’s pipeline, and the contamination was traced to the 1976 leak.
Plantation filed this action in 2012, seeking recovery for amounts it has spent to settle third-party claims, amounts it has expended for remediation, and projected costs to complete remediation. A Plantation executive estimates that Plantation’s costs through 2030 will total between $5.6 million and $8.6 million.
[558]*558The record shows that, at the time the initial fuel leak occurred in Cabarrus County in April 1976, Plantation had $1,000,000 in primary coverage under a comprehensive general liability (“CGL”) policy issued by American Reinsurance Company (subject to a self-insured retention of $100,000) and had excess coverage, including $1 million under an umbrella policy issued by Lexington Insurance Company. Plantation Pipe Line Co. v. Stonewall Ins. Co., 335 Ga. App. at 302. In late 1975, Columbia issued an “Excess Third Party Liability Policy” to Plantation for the period of January 24, 1976 through November 30, 1976. Unless otherwise provided, the Columbia excess policy incorporated the terms of the Lexington umbrella policy.2 In the Insuring Agreements in the Lexington umbrella policy, Lexington agreed
[t]o pay on behalf of [Plantation] the ultimate net loss in excess of the underlying insurance [(the self-insured retention and the primary CGL policy issued by American)], which [Plantation] shall become legally obligated to pay as damages by reason of the liability imposed upon [Plantation] by law . . . because of. . . [p]roperty [d]amage . . . caused by or arising out of an occurrence.
In the Insuring Agreements in the Columbia excess policy, Columbia agreed to indemnify Plantation for loss in excess of the limits of liability of the Lexington policy, which was the “underlying insurance.”3 The Insuring Agreements in the Columbia policy further provide as follows:
This policy applies to injury or destruction taking place during this policy period, provided that when the immediate underlying policy insures occurrences taking place during its policy period, instead of injury or destruction taking place during its policy period, then this policy likewise applies to [559]*559occurrences taking place during this policy period[,] and “occurrences” is substituted for “injury or destruction” in Part III of this policy [regarding reduction of the aggregate].
Because the Lexington policy “insures occurrences taking place during its policy period,” therefore, the Columbia policy “likewise applies to occurrences taking place during [the] policy period[.]” The Lexington policy, and therefore the Columbia policy, covers “[p]roperty [d]am-age ... caused by or arising out of an occurrence.” As the definitions for “property damage” and “occurrence” set forth in the Lexington policy are specifically incorporated in the Columbia policy,
[w]ith respect to ... [p]roperty [d]amage[,] the term “[occurrence” means an event, including continuous or repeated exposure to conditions, which result in . .. [p]roperty [d]am-age neither expected nor intended from the standpoint of the insured. All such exposure to substantially the same general conditions shall be deemed one occurrence.
The declarations page shows that the Columbia policy of excess umbrella liability was in the amount of “$500,000 CSL [Combined Single Limit] per occurrence/aggregate being 8% [sic4] of $4,000,000 CSL per occurrence/aggregate excess of $1,000,000 CSL per occurrence/ aggregate.” It is undisputed that the attachment point of the Columbia excess policy was $2 million.5
1. Columbia contends that it is entitled to judgment as a matter of law that the policy it issued to Plantation is not triggered by the claims at issue in this case.
Columbia points to evidence that the environmental contamination caused by the occurrence at issue, the April 1976 fuel leak, continued to unfold (and even to this day continues to unfold), as the quantity of pollutant that Plantation failed to clean up in 1976 migrated downward through the soil, reached flowing groundwater, and formed a plume in the water table, where it contaminated clean water that made contact with the contaminated water, and that such contamination of previously clean water will continue to occur until [560]*560the remediation process is complete. Columbia argues that this is typical of environmental contamination cases because environmental contamination by its nature occurs over time, gradually or progressively causing personal injury or property damage, which may be unknown to the injured parties for years.
Columbia points to evidence that, from 1976 through 2005, several different insurers issued liability policies to Plantation. Over time, the overall coverage profile varied as the limits of the different, policies, the scheme of the different layers of coverage (self-insured retention, primary coverage, umbrella coverage, excess coverage, etc.), and areas of overlapping coverage all varied from year to year. Columbia argues that it is typical of environmental contamination cases that, because of the progressive nature of environmental contamination, the resulting personal injury or property damage overlaps multiple successive insurance policy periods of the insured’s liability coverage.
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Ellington, Presiding Judge.
Plantation Pipe Line Company filed this action in the Superior Court of Fulton County against five of its excess liability insurers, including Columbia Casualty Company, seeking relief including a declaratory judgment as to each insurer’s respective share of Plantation’s losses arising from a pipeline leak. See Plantation Pipe Line Co. v. Stonewall Ins. Co., 335 Ga. App. 302 (780 SE2d 501) (2015), cert. denied April 26, 2016 (appeal by Plantation from order granting summary judgment in favor of another of Plantation’s excess liability insurers, Stonewall Insurance Company). Plantation and Columbia [557]*557filed cross-motions for summary judgment. The trial court granted Plantation’s motion and denied Columbia’s cross-motion. Columbia appeals both rulings, contending that the trial court erred in allocating all of Plantation’s losses to the policies that were in place at the time of the fuel leak, rather than allocating Plantation’s losses pro rata among the multiple, successive policies that were issued to Plantation over the thirty-year period during which the environmental contamination continued to accrue. When Plantation’s losses are properly allocated, Columbia contends, the losses attributable to the policy period of the Columbia policy as a matter of law did not reach the attachment point of the policy, which is a prerequisite to coverage under the policy For the reasons explained below, we affirm.
The record shows the following relevant undisputed facts.1 On April 2, 1976, Plantation employees discovered that turbine fuel had leaked from an underground Plantation pipeline located in Cabarrus County, North Carolina. Plantation Pipe Line Co. v. Stonewall Ins. Co., 335 Ga. App. at 303. Within 24 hours, Plantation repaired the pipeline and cleaned up the leak. Id. Without resorting to insurance, it compensated the only affected landowner $50. Id. More than 30 years later, on April 3, 2007, one of Plantation’s workers found contaminated soil during maintenance of Plantation’s pipeline, and the contamination was traced to the 1976 leak.
Plantation filed this action in 2012, seeking recovery for amounts it has spent to settle third-party claims, amounts it has expended for remediation, and projected costs to complete remediation. A Plantation executive estimates that Plantation’s costs through 2030 will total between $5.6 million and $8.6 million.
[558]*558The record shows that, at the time the initial fuel leak occurred in Cabarrus County in April 1976, Plantation had $1,000,000 in primary coverage under a comprehensive general liability (“CGL”) policy issued by American Reinsurance Company (subject to a self-insured retention of $100,000) and had excess coverage, including $1 million under an umbrella policy issued by Lexington Insurance Company. Plantation Pipe Line Co. v. Stonewall Ins. Co., 335 Ga. App. at 302. In late 1975, Columbia issued an “Excess Third Party Liability Policy” to Plantation for the period of January 24, 1976 through November 30, 1976. Unless otherwise provided, the Columbia excess policy incorporated the terms of the Lexington umbrella policy.2 In the Insuring Agreements in the Lexington umbrella policy, Lexington agreed
[t]o pay on behalf of [Plantation] the ultimate net loss in excess of the underlying insurance [(the self-insured retention and the primary CGL policy issued by American)], which [Plantation] shall become legally obligated to pay as damages by reason of the liability imposed upon [Plantation] by law . . . because of. . . [p]roperty [d]amage . . . caused by or arising out of an occurrence.
In the Insuring Agreements in the Columbia excess policy, Columbia agreed to indemnify Plantation for loss in excess of the limits of liability of the Lexington policy, which was the “underlying insurance.”3 The Insuring Agreements in the Columbia policy further provide as follows:
This policy applies to injury or destruction taking place during this policy period, provided that when the immediate underlying policy insures occurrences taking place during its policy period, instead of injury or destruction taking place during its policy period, then this policy likewise applies to [559]*559occurrences taking place during this policy period[,] and “occurrences” is substituted for “injury or destruction” in Part III of this policy [regarding reduction of the aggregate].
Because the Lexington policy “insures occurrences taking place during its policy period,” therefore, the Columbia policy “likewise applies to occurrences taking place during [the] policy period[.]” The Lexington policy, and therefore the Columbia policy, covers “[p]roperty [d]am-age ... caused by or arising out of an occurrence.” As the definitions for “property damage” and “occurrence” set forth in the Lexington policy are specifically incorporated in the Columbia policy,
[w]ith respect to ... [p]roperty [d]amage[,] the term “[occurrence” means an event, including continuous or repeated exposure to conditions, which result in . .. [p]roperty [d]am-age neither expected nor intended from the standpoint of the insured. All such exposure to substantially the same general conditions shall be deemed one occurrence.
The declarations page shows that the Columbia policy of excess umbrella liability was in the amount of “$500,000 CSL [Combined Single Limit] per occurrence/aggregate being 8% [sic4] of $4,000,000 CSL per occurrence/aggregate excess of $1,000,000 CSL per occurrence/ aggregate.” It is undisputed that the attachment point of the Columbia excess policy was $2 million.5
1. Columbia contends that it is entitled to judgment as a matter of law that the policy it issued to Plantation is not triggered by the claims at issue in this case.
Columbia points to evidence that the environmental contamination caused by the occurrence at issue, the April 1976 fuel leak, continued to unfold (and even to this day continues to unfold), as the quantity of pollutant that Plantation failed to clean up in 1976 migrated downward through the soil, reached flowing groundwater, and formed a plume in the water table, where it contaminated clean water that made contact with the contaminated water, and that such contamination of previously clean water will continue to occur until [560]*560the remediation process is complete. Columbia argues that this is typical of environmental contamination cases because environmental contamination by its nature occurs over time, gradually or progressively causing personal injury or property damage, which may be unknown to the injured parties for years.
Columbia points to evidence that, from 1976 through 2005, several different insurers issued liability policies to Plantation. Over time, the overall coverage profile varied as the limits of the different, policies, the scheme of the different layers of coverage (self-insured retention, primary coverage, umbrella coverage, excess coverage, etc.), and areas of overlapping coverage all varied from year to year. Columbia argues that it is typical of environmental contamination cases that, because of the progressive nature of environmental contamination, the resulting personal injury or property damage overlaps multiple successive insurance policy periods of the insured’s liability coverage. And Columbia contends that, in this case, multiple successive insurance policies were potentially triggered during later policy periods by the unfolding environmental damage that originated with the 1976 pipeline leak and that Plantation’s losses from remediation costs6 and third-party claims should be allocated among those policies by the Court.
Columbia argues that the legal issue of the appropriate method of allocation is one of first impression in Georgia. Columbia contends:
[T]he legal issue this Court must resolve is the appropriate trigger theory to apply to a claim involving progressive, latent “property damage” that took place over a three decade long period so that it can determine which policies are applicable to the damages at issue, as well as the extent of coverage owed, and the sequence in which the policies should apply.
[561]*561Columbia urges the Court to adopt the so-called “continuous trigger theory.”7 Columbia argues that Plantation’s total financial loss from the latent, continuous, and progressive property damage that took place over three decades should be allocated pro rata among each successive policy period from 1976 to 2007, when the contamination was discovered and became “manifest.” When this is done, Columbia argues, the amount of loss properly allocated to the policy period of the policy it issued to Plantation is far less than the $2 million attachment point for the excess coverage it provides.8 As a result, [562]*562Columbia contends, its policy is not triggered as a matter of law under the continuous trigger theory. Moreover, Columbia argues, the result would be the same if the Court were to adopt in the alternative the so-called “injury in fact” trigger theory.
Even if this Court were inclined to adopt the continuous trigger theory,9 application of this theory is premised on the assumption that the Columbia policy contains language that limits coverage to property damage that takes place during the policy period. But, unlike more contemporary standard CGL policies,10 the Columbia policy and the provisions of the Lexington policy that it expressly incorporates do not provide that the policy applies only to property damage that occurs during the policy period. As quoted extensively above, the insuring agreement in the Columbia policy provides that the policy applies to injury taking place during the policy period unless, instead of insuring injury taking place during the policy period, the Lexington policy insures occurrences taking place during the policy period, which it does. In this case, then, the Columbia policy expressly “applies to occurrences taking place during [the] policy period.” [563]*563Columbia could have drafted the substitution clause to provide that, if the underlying policy insures occurrences taking place during the policy period, then the Columbia policy applies to occurrences taking place during the policy period to the extent of injury taking place during the policy period.11 It did not do so. Therefore, contrary to Columbia’s assertion, this case does not present us with the issue of how to allocate this type of loss among multiple, successive policies that each cover property damage that occurs during the policy’s policy period. Instead, we are presented with a policy that by its plain terms covers property damage caused by an occurrence, provided the occurrence takes place during the policy period and provided the insured’s loss exceeds the attachment point of the policy And it is undisputed that an occurrence took place during Columbia’s policy period (the fuel leak in April 1976), that property damage occurred as a result of the occurrence, and that Plantation’s losses have exceeded the $2 million attachment point of the policy’s excess coverage. Columbia’s argument that its policy was not triggered fails.12 The trial court did not err in denying Columbia’s motion for summary judgment.
2. Columbia contends that the trial court erred in granting Plantation’s motion for summary judgment. Specifically, Columbia argues that “when the continuous trigger and/or injury-in-fact theories of allocation are applied to this case” its policy is not triggered as a matter of law. As explained in Division 1, supra, this argument fails because the Columbia policy does not contain language that limits coverage to property damage that takes place during the policy period, which underpins Columbia’s allocation argument. In a related [564]*564vein, Columbia argues that Plantation failed to identify any evidence that more than $2 million worth of property damage occurred during the coverage period for the Columbia policy, again restating its argument that its policy was not triggered. This argument likewise fails for the reasons already explained above.
In addition, Columbia contends that Plantation’s reliance on the so-called “known loss” doctrine13 is misplaced because the doctrine is not the law of Georgia and because the doctrine is inapplicable, given the fact that “Plantation judicially admitted it did not know petroleum product and contaminants remained subsurface at the Site after it repaired the leak in April, 1976.” It may be reasonable to argue that a liability policy issued by an insurer after an insured becomes aware of an occurrence should not provide coverage for losses arising from the occurrence. But the issue whether some hypothetical insurer other than Columbia could successfully assert a known loss defense is not before us. Accordingly, this argument presents no basis for reversing the trial court’s order granting Plantation’s motion for summary judgment.
Judgment affirmed.
McFadden, J., concurs. Dillard, J., concurs in judgment only.