Custom manufacture and fabrication of metal, plastic, fiberglass and precast concrete structures and equipment, namely, tanks, pits, barrier walls, underground utility structures, process tanks, sectioned plastic tanks, chemical storage tanks, horizontal storage tanks, cylindrical tanks, double wall tanks, conical bottom tanks, chemical feed stations, secondary containment systems, fume hoods, ducts, dewatering containers, filtration equipment, oil/water separators, blending and mixing equipment, polymer mixing and injection systems, chemical dosing systems, solids/liquids separation systems, rainwater harvest systems, wastewater treatment systems, storm water drainage systems, fire water storage systems, back flow prevention systems, and water eductors