NMAC BTWN AN SMA SEL APCHING CLASS C AIRSPACE UNDER INSTRUCTIONS FROM APCH CTL AND A C182 IN THE OPPOSITE DIRECTION OUTBOUND. OTHER TFC HAD BEEN GIVEN BY ATC BUT NOT THIS ACFT. RPTR MADE A L TURN TO AVOID A POTENTIAL COLLISION.

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GOING TO SJC RWY 30R. CALLED BAY APCH ABEAM SOUTH COUNTY ARPT AND RECEIVED STANDARD INSTRUCTION TO FLY TO SJC VIA RHV AT OR ABOVE 2500 FT. BAY APCH CALLED TFC (A CESSNA CARDINAL) OPPOSITE DIRECTION AT 3500 FT. GOT VISUAL ON THE TFC AT 2 O'CLOCK POS. ALMOST IMMEDIATELY; SAW A C182 DIRECTLY IN FRONT OF ME; OPPOSITE DIRECTION; SAME ALT. MADE CLBING L TURN TO AVOID A COLLISION. THE C182 WAS NOT CALLED OUT BY BAY APCH AND ACCORDING TO MY GPS MOVING MAP THE ACFT WAS RIGHT ON THE EDGE OF CLASS C AIRSPACE. THIS IS THE 3RD NEAR MISS I HAVE EXPERIENCED IN ABOUT THE SAME AREA IN THE PAST 11 MONTHS; ALL INVOLVING OPPOSITE DIRECTION VFR ACFT IN VERY GOOD VMC CONDITIONS. ALL HAVE OCCURRED FOLLOWING GA ARR PROCS CHANGE TO SJC. PREVIOUSLY; ARRIVING ACFT TO SJC FROM THE SE WERE IN CLASS C AIRSPACE. NOW; ARRIVING ACFT ARE KEPT OUT OF CLASS C AIRSPACE AND ROUTED OVER RHV TO ENTER R BASE RWY 30R AT SJC. THE OPPOSITE DIRECTION TFC STAYS OUT OF CLASS C AIRSPACE APPARENTLY USING RHV AS A VISUAL CHK POINT TO AVOID CLASS C. THE CURRENT VFR ARR PROC TO SJC ROUTING ACFT OVER RHV AND OUT OF SJC CLASS C AIRSPACE IS A MIDAIR WAITING TO HAPPEN. I RPTED THIS INCIDENT TO A SUPVR AT BAY TRACON AND WAS INFORMED THEY COULD DO NOTHING ABOUT THIS SEEMINGLY DANGEROUS SIT. RECOMMENDATION: RETURN GA SE ARR PROCS TO SJC TO THE PREVIOUS PROCS; IE; KEEPING VFR ARRS WITHIN SJC CLASS C AIRSPACE.