Tracy, CA - Other

I FIRST OF ALL DID NOT SEE A CRAFT. BUT WHAT I DIDI SEE HAS STAYED WITH ME TO THIS DAY. I WAS IN THE PASSENGER SEAT OF MY FRIENDS FATHERS CAR. WE WERE ON OUR WAY FISHING WE TURNED DOWN A ROAD I'M NOT CERTAIN WHERE, I THINK IT WAS NEAR THE AIRPORT OR SOME TYPE OF CONSTRUCTION REQUIRING LARGE DUMP TRUCKS, THE LONG TYPE THAT CARRY LARGE LOADS OF GRAVEL AND DIRT. THERE WAS A MIST OR FOG NEAR THE AREA THAT THE TRUCKS WERE GOING IN AND OUT. WHAT WAS UNUSEUAL ABOUT TIHS MIST WAS THER WAS A LIGHT PROJECTING DOWN ON THE AREA, I THOUGHT IT WAS ON A LIGHT POLE. AS WE CAME TO THE END OF THE ROAD THERE WERE RESTRICTED SIGNS AND WE REALIZED IT WAS A DEAD END. AS WE TURNED A HUGH TRUCK PASSED US I LOOKED BACK BECAUSE IT SUPRISED ME THAT THIS AREA WAS SO BUSY THIS EARY IN THE MORNING. THE LIGHT AS WE TURNED DREW UPWARDS INTO THE MIST AND THERE WAS A SPARKLE LIKE THE EMBERS FROM A LOG IN A CAMPFIRE AS IT IS BEING MOVED OR TURNED. AT THIS POINT I WAS LOOKING THROUGH THE REAR WINDOW AND WHAT SUPRISED ME WAS THE SPARKLE SORT OF IMPLODED INTO THE MIST RIGHT BEHIND THE LIGHT AND THE FOG OR MIST SURROUNDING IT MOVED TOWARDS THE GRAVEL PIT OR CONSTRUCTION AREA. I'VE NEVER SEEN ANYTHING LIKE IT I WAS OVERCOME. I SORT OF SAID A LITTLE SOMETHING TO MY FRIENDS FATHER, BUT NOT MUCH. AT THAT POINT I WAS WISHING FOR A PHONE TO CALL THE AIR FORCE AND JUST LEAVE A MESSAGE AND NOT TELL THEM WHO I WAS. I JUST COULD NOT ACCEPT THE FACT THERE WAS NO POLE FOR THIS LIGHT AND THE ONLY REASON IT DISSAPEARED SO FAST WAS IT SPOTTED US COMING AROUND THE EXITING GRAVEL DUMP TRUCK. THE FACT REMAINS SOMETHING WAS GOING ON HERE AND I'VE WONDERED IF SOME SECRET FACILITY WAS BEING BUILT HERE OR WHAT WOULD HAVE BEEN THE REASON FOR THE OBSERVATION. I'M NOT POSITIVE OF THE DATE AND EXACT TIME BUT IT WAS JULY OR AUGUST AND IT WAS DARK JUST 30 TO 45 MIN BEFORE SUNRISE.