A BE02 FLC WAS CLRED FROM EAT; WA; TO SEA 'AS FILED...RPT CASHS' THIS WAS IN CONFLICT WITH THE FLT PLAN FILED AS THEY WERE NOT TO GO ON THE 253 DEG RADIAL OF EAT VOR BUT VIA THE 185 DEG RADIAL AND THEN CHINS; CHINS 2 ARR SEA. AFTER CASHS THE FLC WAS NOT GIVEN AN AMENDED RTE OR ARR; ATC ASSUMED THAT THE EPH PT EPH4 ARR WOULD BE FLOWN. A PROB WITH PERCEPTION AND ARTCC INTRAFAC COORD. RPTRS ARE CONCERNED WITH POSSIBILITY FOR TFC CONFLICT AND FAILURE TO ISSUE NOTAMS AS REQUIRED.

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DEPARTING FROM WENATCHEE (EAT); AN UNCTLED ARPT BELOW ZSE RADAR COVERAGE. FLT FROM EAT TO SEA. AS FO; COPIED CLRNC AS: CLRED TO SEATAC AS FILED; MAINTAIN 14000 FT; RPT CASHS INTXN; DEP FREQ 126.10. HOWEVER; FLT RELEASE ON DISPATCH RELEASE FILED US DIRECT ELLENSBURG (ELN); CHINS INTXN; CHINS.2 ARR. THE CONFLICT OCCURS BECAUSE CTR CTLR CLRED US TO RPT 'CASHS' INTXN WHICH IS ON V120 (R253) OFF EAT VOR. THIS IS A WBOUND CLRNC; CONTRARY TO THE FILED SBOUND CLRNC. I BROUGHT THIS TO THE CAPT'S ATTN WHO AGREED A CONFLICT IS OCCURRING. I ASKED CTLR DOES HE WANT US ON V120 WBOUND. HE REPLIED; SINCE AN ACR DASH 8 INBOUND FROM SEA HAD CANCELED IFR; V120 WAS NOW AVAILABLE. WE DEPARTED VFR CONDITIONS AND PROCEEDED ON V120 WBOUND. SINCE OUR UNDERSTANDING OF THE CLRNC WAS DIRECT ELLENSBURG WE ASSUMED ONCE WE HIT CASHS INTXN; WE NEEDED TO PROCEED SBOUND. THIS DIDN'T MAKE SENSE. AFTER DISCUSSION BTWN MY CAPT AND MYSELF; THE CAPT ASKED CTR WHICH ARR THEY ARE PLANNING FOR US. NEXT SECTOR SAID EPHRATA 4 ARR. THIS IS CONTRARY TO OUR FILED CLRNC AND NO AMENDMENT WAS ISSUED. CAPT THEN CALLED PREVIOUS SECTOR 126.10 TO QUERY WHAT JUST HAPPENED. CAPT STATED FILED CLRNC WAS SBOUND BUT INITIAL CLRNC WAS TO CASHS INTXN; W OF EAT. HE ASKED IF HE THOUGHT WE WERE GOING W TO CASHS BEFORE TURNING SBOUND TO ELN. HE STATED THERE WAS SOME CONFUSION ON THEIR PART BECAUSE THEY NORMALLY GET A CLRNC FOR FLTS DIRECT CASHS INTXN; EPHRATA 4 ARR. WE HAVE HAD SEVERAL PROBS IN THIS ARPT WITH ZSE. THIS IS UNACCEPTABLE IN SUCH AN 'ACCIDENT WAITING TO HAPPEN' ARPT. BTWN NUMEROUS GLIDERS; HIGH TERRAIN SURROUNDING THE ARPT; ACR OPS THROUGHOUT THE DAY AND NIGHT; FIRE-TANKER OPS AND VFR LCL TFC. THE CTLRS CAN ILL AFFORD TO 'ASSUME' WHICH CLRNC WE ARE FILED VERSUS THE ACTUAL CLRNC WE WERE PREPARING TO EXECUTE. THE CTLR STATED THEY MADE A MISTAKE IN NOT READING OUR CLRNC BEFORE ISSUING IT. THE PLT UNION ATTORNEYS ARE INVOLVED AND ARE TRYING TO SECURE THE TAPES. IT IS BECOMING EVIDENT EAT ARPT AND SURROUNDING AIRSPACE SHOULD BE GIVEN SPECIAL DESIGNATION AND PROCS -- AND MORE SCRUTINIZATION OF ATC. DURING A RECENT OUTAGE OF THE EAT VOR; A TEMPORARY AIRWAY AND TEMPORARY CASHS INTXN WAS ESTABLISHED. ZSE HAD ISSUED CLRNCS FOR A WK UNTIL A CAPT CALLED AND POINTED OUT NO FDC NOTAMS EXISTED. THE CTLING SUPVR DISCOVERED THEY FAILED TO FILE THE FDC NOTAM!