A CL601 CAPT MISUNDERSTOOD HIS CLRNC FROM L30 TRACON; DURING DEP FROM LAS; WHICH CAUSED HIM TO OVERSHOOT AN ALT RESTR.

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THERE WERE LONG DELAYS IN DEPARTING LAS VEGAS THIS DATE. WE ASKED FOR CLRNC AND WERE ADVISED THAT THERE WOULD BE A 50 MIN DELAY UNTIL ENG START WOULD BE APPROVED. THERE WERE APPROX 40 ACFT IN FRONT OF US. OUR CLRNC WAS CLRED TO VNY VIA THE BOACH 1 DEP; CLB TO AND MAINTAIN 7000 FT; EXPECT FL220 AS A FINAL; SQUAWK XXXX. THE CLRNC WAS READ BACK AND CONFIRMED TO BE CORRECT. AFTER DELAYS IN FINDING A SLOT FOR US IN THE DEPARTING LINE-UP OF ACFT; WE FINALLY MADE OUR WAY TO RWY 19L; OUR FMS RECORDED OUR WHEELS UP. (I WAS THE PIC FOR THIS FLT; HOWEVER; THE CO-PLT WAS FLYING FROM THE L SEAT.) IN FLYING THE PUBLISHED SID; AND SHORTLY AFTER TKOF; WE ENCOUNTERED MODERATE; BORDERING ON SEVERE TURB. WE EXPECTED THIS AS THE WINDS WERE FROM THE S AT 20 KTS; GUSTING TO AS MUCH AS 35 KTS. MY SID CHART; WHICH WAS CLIPPED TO THE YOKE; FLEW OFF; AS WELL AS PENS AND OTHER NONSECURED ITEMS. AT THIS TIME; LAS ATC CALLED WITH THE INSTRUCTIONS TO CLB TO AND MAINTAIN FL190 AND COMPLY WITH RESTRS. I READ BACK 'CLB TO FL190 AND WILL COMPLY WITH RESTRS.' I WAS ATTEMPTING TO GATHER UP MY DISPLACED ITEMS WHILE ALL THE TIME THE ACFT WAS GETTING BEAT UP PRETTY GOOD BY THE ENSUING TURB. IN RESETTING THE ALT SELECTOR TO FL190; I READ THE SID WHERE IT SAID TO CROSS BOACH AT OR ABOVE 13000 FT AND FELT WE WERE IN COMPLIANCE WITH THE RESTRS. THE SID WAS FOLDED OVER FROM BEING DISLODGED AND I FAILED TO SEE THAT THERE WAS MANDATORY LEVEL OFF POINT AT 7000 FT AT ROPPR WHICH WAS PRIOR TO BOACH. ALTHOUGH I WAS NOT PHYSICALLY FLYING THE ACFT; THE CO-PLT WAS FOLLOWING THE DIRECTIONS THAT I HAD GIVEN HIM. IN RETROSPECT; ALTHOUGH I COMMITTED THE ERROR; ATC IN ITS EFFORT TO GET THE MAX AMOUNT OF ACFT INTO THE AIR; SHOULD HAVE LET THE INITIAL DEP CLRNC STAND; AS THAT WAS WHAT WE; AS PLTS; BRIEFED PRIOR TO DEP. AND THAT WOULD HAVE ENSURED A LEVEL OFF AT THE REQUIRED ALT. BEFORE BEING HANDED OFF TO ZLA; LAS DEP GAVE ME A TELEPHONE NUMBER TO CALL WHEN WE LANDED. I SPOKE WITH LAS TRACON. WE DISCUSSED THE EVENTS THAT I PREVIOUSLY WROTE. HE ASKED FOR MY ADDRESS AND CERTIFICATE NUMBER; WHICH I GAVE HIM. AFTER OUR DISCUSSION; I GOT THE DISTINCT FEELING THAT THIS WAS NOT THE FIRST TIME THAT THIS HAD OCCURRED OVER THIS INTXN. I STRONGLY FEEL THAT HAD ATC NOT ALTERED OUR CLRNC; AT A CRITICAL POINT IN THE FLT; WITH NOT ONLY THE TURB; NAVING THE ACT; I WAS PERFORMING THE AFTER TKOF CHKLIST AS WELL. AS PLTS; WE BRIEFED THE DEP TOGETHER; AS IS NORMALLY DONE. TO BE GIVEN SOMETHING OTHER THAN WHAT WAS BRIEFED IN THIS PHASE OF FLT SET UP THIS INCIDENT. HAD HE GIVEN THE AMENDED CLRNC ON THE GND; BOTH OF US WOULD HAVE TAKEN THE NECESSARY TIME TO GO OVER THE DEP; AND BRIEF EACH OTHER ON THE AMENDED PROC.