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Home My WebLink AboutNC0082139_Plan of Action_20191205HazenMemorandum Re: Lagoon and NPDES Future Flow Estimations • Residuals Flow Estimations o Typical Operation ■ Scenarios: RECEIVED DEC 0 5 2019 NCDEQIDWRINPDES Scenario 1: Average flow (21 mgd), average solids loading (300 lb/MG) Scenario 2: Average flow (21 mgd), maximum month solids loading (500 lb/MG) Scenario 3: Maximum month flow (30 mgd), average solids loading (300 lb/MG) Operational Conditions 100 hour filter run times • 1 sedimentation basin blowdown per train per day • 1 hour Superpulsator cycle run times o Increased Residuals Operation Scenarios Scenario 4: Maximum month flow (30 mgd), maximum week solids loading (570 lb/MG) Scenario 5: Maximum month flow (30 mgd), maximum month solids loading (5001b/MG) Operational Conditions • 60 hour filter run times • 1 - 2 sedimentation basin blowdowns per train per day • 1 hour Superpulsator cycle run times o Add Contingency for Clearwell and Basin Draining ■ One Clearwell = 3 MG ■ One SuperP = 0.5 MG 3.5 MG averaged over 30 days = 0.12 MG o Max Month Flow and Max Month Loading plus contingency for clearwell and basin draining = 0.97 MG *does not include any stormwater discharge to lagoon Solids Average Flow Average Flow Max Month Max Max Production: Avg Loading Max Month Flow Month Month Loading Avg Loading Flow Flow Max Week Max Loading Month Loading Scenario 1 2 3 4 5 Volume (MG): 0.52 0.52 0.57 0.93 0.85 Hazen and Sawyer - 4011 W estChase Boulevard, Suite 500 • Raleigh, NC 27607. 919.833.7152 Hazen Table 1-2: Sedimentation Basin Blowdown Sampling Plan Location Basin 1 Sed Basin Drain Vault 1 Basin 2 Sed Basin Drain Vault 1 Basin 3 Sed Basin Drain Vault 1 Basin 4 Sed Basin Drain Vault 2 Basin 5 Sed Basin Drain Vault 2 Basin 6 Sed Basin Drain Vault 2 Parameter TSS TSS TSS TSS TSS TSS Frequency Every 10 minutes during a full blowdown event It is recommended that this sampling plan be carried out once. Samples should be taken during typical solids loading conditions and in the course of one evening when blowdowns are typically initiated. Sampling Plan Page