THIS REPORT PRESENTS RECOMMENDATIONS FOR STRUCTURAL DESIGN, MATERIALS, AND CONSTRUCTION OF CONCRETE TANKS, RESERVOIRS, AND OTHER STRUCTURES COMMONLY USED IN WATER AND WASTE TREATMENT WORKS WHERE DENSE, IMPERMEABLE CONCRETE WITH HIGH RESISTANCE TO CHEMICAL ATTACK IS REQUIRED. SPECIAL EMPHASIS IS PLACED ON A STRUCTURAL DESIGN WHICH MINIMIZES THE POSSIBILITY OF CRACKING AND ACCOMMODATES VIBRATING EQUIPMENT AND OTHER SPECIAL LOADS. PROPORTIONING OF CONCRETE, PLACEMENT, CURING AND PROTECTION AGAINST CHEMICALS ARE ALSO DESCRIBED. DESIGN AND SPACING OF EXPANSION AND CONTRACTION JOINTS RECEIVE SPECIAL ATTENTION. /AUTHOR/