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i Design and Specifications a The. operator should anticipate wasting sludge when the' SSV-60 (settlometer) is 500 ml or greater. With an F:M ratio of 0.1 to 0.5 maintained at a 300-mg/L loading, the MLSS should be maintained around 3,000 mg/L- thus, the operator should anticipate an actual sludge density of 2 to 3% in each batch of sludge volume. The minimum amount of sludge to waste shall be 5% of-clarifier sludge volume. There is no maximum amount of sludge which may be wasted; the entire volume of sludge may be removed to increase the time periods between wastings. The treatment plant is sized at 5,000 gpd maximum hydraulic flow. The clarifier has an operating Lcapacity of 1,002 gallons, of which 330 gallons 'are supernatant volume and 672 gallons are sludge volume. Sludge wasting of 5% of this volume will equal approximately 34 gallons. Wasted sludge will be disposed of in accordance with local ordinances by pumping and transport- ing to an authorized disposal site. Transportation will be by a licensed septic-tank pumping company. Sludge disposal'is considered part of the general operation and maintenance proce- dures; all pumping and transportation costs will be assumed by project operators. CONSTRUCTION OF UNIT it 1. Arrangement. This plant shall be supplied in multicomponent units: aeration reactor, clarifier chamber, chlorine contact chamber, and the tertiary filter are the main components; all other components are considered supporting assemblies. 2. Construction. Each item shall be a complete, preengineered sewage treatment plant compo- nent which, when combined with other treatment unit components, shall comprise the entire sewage treatment plant. Tank walls shall be constructed of fiberglass-reinforced plastic suffi- ciently ribbed or reinforced to withstand 300% of maximum capacity interior hydrostatic 1 pressures. w 3. Piping. Piping shall be as specified to satisfy local code and application requirements. All pressure-loaded pipes, valves, and'fittings will be Sch 80 PVC. Nonpressure-loaded pipes, valves, and fittings may be Sch 40 PVC. The owner shall provide all pipes, valves, and fit- tings which are external to the plant. The owner's contractor is responsible for assembling the system according to drawings supplied by AquaClear and customer's project engineer. AquaClear will have a qualified representative at the assembly site during assembly of the treatment plant. 4. Component Tie-in. Mechanical and electrical equipment shall be integrally connected to form a complete system. All mechanical and electrical components shall be easily removable and replaceable without requiring special tools or fixtures. 5. Hatches/Manhole Covers. The aeration charnber shall be provided with lockable hatches or L manhole covers. 6. Tank Surfaces. Where deemed necessary, all tank surfaces will have nonskid protection for secure footing. All grating frames (if applicable) shall be laminated or bolted securely to the i0