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Los Angeles-based Mercury Air Group Inc. named Steven R. Ritchie president of its subsidiary Mercury Air Cargo Inc. . . . Oakland-based Granny Goose Foods Inc. said it has successfully acquired Country Club Foods Inc., a Kaysville, Utah-based snack foods manufacturer, for undisclosed terms. . . . San Jose-based Atmel Corp. reported second-quarter net income of $27.4 million, or 27 cents, compared with $50.3 million, or 50 cents in the second-quarter of 1996. . . . Sunnyvale-based ArthroCare Corp. named Michael A. Baker president and chief executive.