SINCE 1962, ROBROY HAS BEEN AT THE PRESENT SITE. IT HAS BEN IN THE BUSINESS OF ELECTRICAL CONDUIT MANUFACTURING. IN 1967, AN ACID WASTE PIT RECEIVED UNTREATED ACID WASTES AND WAS UNLINED. IN 1970, A WASTEWATER TREATMENT IMPOUNDMENT WITH OIL SKIMMERS WAS CONSTRUCTED TO RECEIVE WASTE HIGH IN INC, CYANIDE, CHROMATE, AND A LOW PH. LIME WAS SENT TO THE ACIT PIT AT THIS TIME. AROUND 1972, NETRALIZATION SYSTEM WAS INSTALLED. DURING 1977, TWQB ACKNOWLEDGED GROUNDWATER CONTAIMINATION, ACID PIT WAS CLAY LINED AND SLUDGES ENCAP- SULATED, AND TWO MONITORING WELLS WERE TO BE DRILLED. IN JAN 1978, SITE B LANDFILL WAS CONSTRUCTED AND RECEIVED SLUDGE FROM ACID PIT WITH SUPERNATANT GOING TO WASTEWATER IMPOUNDMENT AND PLANS WERE TO USE 25% OF ACID PIT FOR DE- WATERING WASTES BEFORE DISPOSAL. IN OCTOBER 1978, SEEPAGE FROM ACID PIT WAS EVIDENT, AND IN 1978, ELECTROPLATING WAS DISCONTINUED BUT PRE-GALVANIZING-PICKLING CONTINUED. * APRIL 11, 1983, THE PRE-GALVANIZING-PICKLING PROCESS WAS DISCONTINUED AND THE FACILITY WAS NO LONGER GENERATING PROCESS WASTES. THE WASTE COMPONENTS INCLUDE SITE B LANDFILL, SITE A EVAPORATION IMPOUNDMENT (OLD ACID PIT) AND PART OF THE SITE A WASTEWATER TREATMENT IMPOUNDMENT (PARTIALLY CLOSED). IN 1980, A GW INJECTION AND RECOVERY SYSTEM WAS INSTALLED TO TRY A CLEANUP OF THE GW, BUT PROVED UNSUCCESSFUL. TDWR ISSUED AN