A B737-700 FLT CREW ON ARR TO SNA EXCEEDED THE 200 KT SPD LIMIT BELOW THE CLASS B FLOOR.

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ON THE TANDY 3 TO SNA; RECEIVED VECTORS FOR R DOWNWIND FOR ILS RWY 19R AT SNA. AT 5000 FT MSL; APPROX 10 MI W OF THE FIELD; THE CTLR ASKED FOR OUR AIRSPD. WE REPLIED 250 KTS. HE SAID SOMETHING LIKE; 'YOU'RE THE THIRD COMPANY IN A ROW THAT HAS EXCEEDED THE SPD AS BRIEFED.' WHEN WE QUERIED HIM FURTHER HE STATED THAT HIS FACILITY CHIEF HAD BRIEFED COMPANY ON THE NEED TO FLY AT 200 KIAS BELOW THE CLASS B AIRSPACE. WE EXAMINED OUR CHARTS AND FOUND THAT THE FLT PATH DID INDEED PASS UNDER A SMALL CORNER OF THE LAX CLASS B AIRSPACE WITH A FLOOR OF 7000 FT. THERE WAS ALSO A NOTE ON THE CHART FOR SNA WHICH CAUTIONS CREWS WHEN ARRIVING ON THE TANDY THAT 'IF APCH CTL TURNS YOU EARLY FOR A DOWNWIND TO RWY 19; YOU MAY DSND BELOW THE 7000 FT FLOOR OF THE CLASS B AIRSPACE.' AFTER EXAMINING THE CHARTS WE NOTICED THAT EVEN IF ONE FLIES THE ENTIRE TANDY AND IS GIVEN AN ALT BELOW 7000 FT; ONE WILL BE BELOW THE CLASS B AIRSPACE. 1) BOTH THE CAPT AND I HAD BEEN INTO SNA SEVERAL TIMES AND DID NOT RECALL EVER HAVING THIS PROB (PERHAPS BECAUSE ATC HAD ASSIGNED US THE APPROPRIATE SPD ON THOSE PREVIOUS OCCASIONS). THIS FAMILIARITY ALSO LED US TO BE COMPLACENT REGARDING CHKING THE NOTES ON THE CHART AND CAREFULLY REVIEW THE CHARTS REGARDING THE CLASS B AIRSPACE. BETTER DISCIPLINE IN CHKING NOTES/CHARTS EVEN IN FAMILIAR TERRITORY WILL HELP PREVENT A RECURRENCE. 2) THE ARR/APCH CHARTS DO NOT DEPICT THE BOUNDARIES OR FLOORS OF THE CLASS B AIRSPACE. ONE MUST CONSULT THE LOW ALT ENRTE CHART TO FIND THE EXACT AREA IN QUESTION. ALSO THE ACFT HAS MAP DISPLAYS BUT DOES NOT DEPICT AIRSPACE. IN OTHER WORDS; THE INFO IS NOT OBVIOUSLY AVAILABLE AND; THEREFORE; EASY TO MISS. PERHAPS ENHANCED CHARTING; DISPLAYS; AND NOTES WILL HELP PREVENT FURTHER OCCURRENCES. SUPPLEMENTAL INFO FROM ACN 705511: ATC SAID WE WERE BELOW THE CLASS B AIRSPACE AND WAS VERY PERTURBED THAT WE DID NOT REALIZE WE WERE BELOW CLASS B AIRSPACE. IT IS NOT OBVIOUS WHERE THE CLASS B AIRSPACE IS ON THE ARR INTO SNA. AT BEST WE WERE 3-5 MI INTO AND BELOW THE AIRSPACE. THE 10-7 PAGE MAKES MENTION OF THIS BUT IT IS A VERY VAGUE REF AND NOT VERY HELPFUL. PUT AIRSPACE OVERLAYS ON THE MFDS. PUT SPECIFIC AIRSPD RESTR ON THE TANDY ARR PAGE. PUT A MORE DIRECTIVE NOTE ON THE 10-7 PAGE SUCH AS SLOW TO 210 KTS WITHIN 15 NM OF THE FIELD.