A federal lawsuit filed last fall by Santa Barbara Channelkeeper and the Environmental Defense Center against Ojai Quarry owner Larry Mosler ended in a settlement this week. The environmental groups alleged that Mosler’s operations — positioned at the Lower North Fork of Matilija Creek, which feeds into the Ventura River — were polluting the water, to the possible detriment of endangered steelhead. Under the deal, Mosler will strengthen the quarry’s storm-water retention system, pave access roads, and abstain from mining when it rains.