CONGOLEUM CORPORATION IS A DELAWARE CORPORATION W/ITS CORPORATE HEADQUARTERS LOCATED IN PORTSMOUTH, NH. THEY PRI- MARILY MANUFACTURE RESILIANT FLOOR COVERING FOR WHOLESALERS & RETAILERS, AND IT OPERATES SEVERAL MANUFACTURING PLANTS IN THIS COUNTRY. THE MARCUS HOOK FACILITY OCCUPIES 1,353,707 SQ FT & OPER- ATES 4 FINISHING LINES & 2 ROTOGRAVURE PRINTING PRESSES. THE FINISHING (COATING) LINES ARE USED TO APPLY & CURE VINYL PLASTISOL ON A SUBSTRATE WHICH IS LATER PRINTED W/A DESIGN ON THE ROTOGRAVURE PRESSES. THE FINAL PRODUCT IS A RESIL- IENT VINYL FLOOR COVERING. CONGOLEUM'S MANUFACTURING PROCESS INCLUDES SURFACE COATING OPERATIONS WHICH GENERATE EMISSIONS OF VOLATILE ORGANIC COM- POUNDS (VOC). VOCS ARE A PRECURSOR OF OZONE & ARE REGULATED UNDER EPA'S APPROVED STATE IMPLEMENTATION PLAN (SIP) FOR THE COMMONWEALTH OF PA. ON 8/22/84, EPA INSPECTORS CONDUCTED AN AIR COMPLIANCE INSPECTION UNDER SEC 114 OF CAA, 42 USC SEC 7414, TO DETERMINE COMPLIANCE W/APPLICABLE PA SIP REGULATIONS. A TO- TAL OF 7 SAMPLES WERE TAKEN DURING THIS INSPECTION, 2 FROM THE COATING LINES & 5 FROM THE 2 ROTOGRAVURE PRESSES. THE LATER 5 SAMPLES REPRESENTED EACH OF THE 5 INK COLORS BEING USED IN PRODUCTION THAT DAY AT BOTH PRESES. ANALYSIS OF THE 5 INK SAMPLES TAKEN FROM ROTOGRAVURE PRIN TING LINES #28 & # 121 DURING THE INSPE