(September 12, 2017, 10:59 AM EDT) -- LOS ANGELES — The Second District California Court of Appeal on Aug. 31 determined that an insured cannot electively stack its excess insurance policies in an environmental coverage dispute and said that each of the more than 115 policies at issue must be individually analyzed to determine whether a horizontal exhaustion method should be applied (Montrose Chemical Corporation of California v. Superior Court of the State of California, et al., No. B272387, Calif. App., 2nd Dist., Div. 3, 2017 Cal. App. LEXIS 759)....