SJC LCL CTLR EXPERIENCED OPERROR WHEN RELEASING ACFT FROM INTXN WITHOUT PROPER TIME INTERVAL.

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B737 WAS DEPARTED FROM FULL LENGTH RWY 30R AFTER APPROX 1 1/2 MIN HOLD FOR DEP SPACING. H25B READY FOR DEP AT TXWY C WHILE B737 HOLDING IN POS. AFTER B737 DEPARTED; H25B PUT INTO POS FOR SPACING AND WAS CLRED FOR TKOF 2 MINS AFTER B737 DEPARTED. REQUIRED HOLD WAS 3 MINS REGARDLESS OF MILEAGE UNLESS PLT REQUESTED WAKE TURB WAIVER. WITH WAIVER; REQUIRED SEPARATION IS AS LOW AS 6000 FT. ACTUAL SPACING WAS 2 MINS AND APPROX 6 MI. I WAS UNAWARE OF THE ERROR AND WAS NOT ADVISED BY ANYONE AT THE TIME OF OCCURRENCE. SUPVR RPTED FOR WORK IN TWR APPROX 20 MINS AFTER INCIDENT. ERROR WAS RPTED TO SUPVR 4 HRS LATER BY GND CTLR. BOTH MYSELF AND THE CTLR IN CHARGE (CIC) HAD LEFT FOR THE DAY BY THIS TIME. GND CTLR ALLEGES THAT HE ADVISED THE CIC OF THE ERROR AT THE TIME OF OCCURRENCE. CIC DISPUTES AND I HEARD NO CONVERSATION OF ANY KIND DURING THE TIME SURROUNDING THE INCIDENT. GND CTLRS AT NO TIME ADVISED ME OF DEVELOPING INCIDENT SUCH THAT IT COULD BE AVOIDED OR MITIGATED. HIS STATEMENT SUPPORTS THIS. THIS IS THE 2ND TIME THIS INDIVIDUAL HAS OBSERVED AND FAILED TO ALERT ANOTHER EMPLOYEE OF A DEVELOPING INCIDENT AND THEN RPTED LATER. HUMAN FACTORS: 45 MINS PRIOR TO THIS INCIDENT; I WAS FORCED TO ISSUE EVASIVE MANEUVERS TO AN ARRIVING MD80 DUE TO AN OPERROR BY NORCAL APCH INVOLVING AN IFR BE35 WHICH DEPARTED RHV. CLOSEST POINT OF APCH BTWN THESE ACFT WAS LESS THAN 1 MI/SAME ALT. I WAS SOMEWHAT SHAKEN BY THE EVENT AND SHOULD HAVE ASKED TO BE RELIEVED. THIS ERROR IS ULTIMATELY MY RESPONSIBILITY. TEAMWORK DID NOT OCCUR IN THIS SIT. I BELIEVE THE GND CTLR'S FAILURE TO ALERT ME WAS DELIBERATE. THIS IS THE 2ND TIME THIS INDIVIDUAL HAS DONE THIS.