Non-Standard Endorsements Can Have Unexpected Consequences
Check that policy (and endorsement) wording carefully
Pennsylvania General Insurance Co. v. American Safety Indemnity Co., 185 Cal. App. 4th 1515 (2010)
In 1995, the California Supreme Court held in Montrose Chemical Corp. v. Admiral Ins. Co., 10 Cal. 4th 645 (1995) *("Montrose II") that in cases of continuing damage, all liability policies from the time the damage started occurring until the time that the insured's liability for that damage was determined were potentially implicated.