On January 22 to 25 and February 20 to 22, 1980, personnel from the National Enforcement Investigations Center (NEIC) and the State of Maryland Water Resources Administration conducted a plant inspection of process wastewater sources, wastewater treatment and disposal systems, and solid and hazardous waste disposal practices at the SCM Glidden-Durkee Adrian-Joyce Works near Baltimore, Maryland. The Adrian-Joyce Works is operated by the Glidden Pigments Group of the Chemical and Metallurgical Division of SCM. The facility manufactures titanium dioxide (TiOb2s) by the sulfate and chloride processes. Titanium dioxide, a high-volume chemical ranking within the first fifty of all U.S. chemical production, is manufactured domestically by six companies in eleven plants. Over 50% of the TiOb2s produced is used in paints, varnishes, and lacquers. About one-third is used in the paper and plastics industries. Other uses are found in ceramic, ink, and rubber manufacturing. Waste streams from the chloride process fall into two categories: (1) chlorination wastes composed of sludge from titanium tetrachloride production, and (2) wastes incurred during the oxidation process and milling of the TiOb2s product. The sulfate process has a very heavy water-borne waste load consisting of about 2,000 lbs of sulfuric acid and 1,000 lbs of metal sulfates per 1,000 lbs of product. Waste streams generated in the sulfate process include: (1) sludge from the digestion and subsequent filtration of the ore, (2) copperas, (3) strong acid cuts, (4) weak acid cuts, and (5) titanium dioxide losses. The sulfate process wastewater is the more difficult to treat due to impurities from the lower-grade ores and the volumes of sludge and gypsum produced in wastewater neutralization.