I live in Orangevale, which is across the river from Old Town Folsom, though I haven't played
40k in about 3 years. The place to play in the area is right up Highway 50 from Folsom at Great Escape Games:
http://www.greatescapegames.com/
1250 Howe Avenue #3A
Sacramento,
CA 95825
(916) 927-0810
"We’re tucked back behind the shopping center in the Southwest corner."
40K is typically played there on Friday nights, Fantasy on Saturday, but you get die-hards for both systems there on both nights. I tend to play Fantasy Battles on Saturday nights.