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NCSD Southland WWTF MP

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NCSD Southland WWTF MP Nipomo Community Services District Southland Wastewater Treatment Facility MASTER PLAN Nipomo Community Services District AECOM District General Manager Bruce Buel Project Manager Mike Nunley, PE District Engineer Peter Sevcik, PE Project Engineer Eileen Shields, EIT Utility Superintendent Tina Grietens January 2009 1194 Pacific Street, Suite 204 for San Luis Obispo, CA 93401 Wastewater Treatment Plant P 805.542.9840 Upgrade and Expansion Project F 805.542.9990 www.aecom.com 1194 Pacific Street, Suite 204 San Luis Obispo, CA 93401 P 805.542.9840 F 805.542.9990 www.aecom.com Nipomo Community Services District Southland Wastewater Treatment Facility MASTER PLAN January 2009 Nipomo Community Services District AECOM District General Manager Bruce Buel Project Manager Mike Nunley, PE District Engineer Peter Sevcik, PE Project Engineer Eileen Shields, EIT Utility Superintendent Tina Grietens Table of Contents ___________________________________________________________________________________ 1.0 INTRODUCTION ....................................................................................................1 1.1 Background ...............................................................................................1 1.2 Objectives and Scope of Work ..................................................................1 2.0 EXISTING LOADS..................................................................................................4 2.1 Flow Analysis.............................................................................................4 2.2 Loading Rates and Solids Production .......................................................6 2.3 Inflow and Infiltration..................................................................................8 3.0 PROJECTED LOADS...........................................................................................10 3.1 Projected Future Flow Demands.............................................................10 3.2 Projected Future Plant Loading...............................................................10 4.0 EXISTING WASTEWATER TREATMENT FACILITY..........................................14 4.1 Waste Discharge Requirements..............................................................14 4.2 System Components ...............................................................................14 4.3 Effluent Quality ........................................................................................18 5.0 PLANT PERFORMANCE AND CAPACITY .........................................................20 5.1 Ability of Existing System to Meet Current Demand ...............................20 5.2 Ability of Existing System to Meet Future Demand .................................25 6.0 WATER QUALITY GOALS...................................................................................30 6.1 Recycled Water Usage............................................................................30 6.2 Option 1 - Unrestricted Urban Reuse......................................................30 6.3 Option 2 - Groundwater Recharge Reuse...............................................37 6.4 Option 3 - Maintain Current Discharge Practices....................................44 6.5 Recommendations...................................................................................44 7.0 SYSTEM IMPROVEMENTS.................................................................................46 7.1 Frontage Road Trunk Main .....................................................................46 7.2 Influent Pump Station ..............................................................................46 7.3 Screening and Grit Removal ...................................................................49 7.4 Sludge Removal ......................................................................................52 7.5 Operability and Automation .....................................................................55 7.6 Recommendations for Facility Improvements .........................................57 8.0 FUTURE PROCESS ALTERNATIVES ................................................................59 8.1 Expansion of Aerated Ponds...................................................................59 8.2 Biolac® Conversion.................................................................................63 i 8.3 Activated Sludge......................................................................................68 8.4 Oxidation Ditch ........................................................................................69 8.5 Tertiary Treatment...................................................................................72 8.6 Solids Handling........................................................................................73 8.7 Wastewater Disposal...............................................................................76 8.8 Removal of Sludge from Drying Beds during Construction.....................76 8.9 Alternative Energy Supply .......................................................................77 8.10 Recommendations...................................................................................78 9.0 CONCLUSIONS & RECOMMENDATIONS .........................................................79 9.1 Conclusions .............................................................................................79 9.2 Recommendations...................................................................................80 10.0 RECOMMENDED CAPITAL IMPROVEMENTS PLAN & OPINION OF PROBABLE COST…………………………….…………………………………………………………….….81 11.0 BASIS FOR ASSESSMENT OF RATES & FEES................................................84 ii List of Tables Table 2-1 Historic Flow and Precipitation Data Table 2-2 Summary of Peaking Factors Table 2-3 Influent BOD5 Concentrations and Loading Table 3-1 Project Flow Rates Table 3-2 Project BOD5 Loading Rates Table 4-1 Effluent Water Quality Requirements Table 4-2 Historical Plant Effluent Table 5-1 Estimated Contributing Flows to Frontage Road Trunk Main Table 5-2 Modeled Effluent Quality under Existing Flow Conditions Table 5-3 Treatment Capacity of Existing System under Future Flow Conditions Table 6-1 Guidelines for Interpretation of Water Quality for Irrigation Table 6-2 Summary of Effluent Quality from NCSD Southland WWTF Table 6-3 Crop Specific Tolerance Limits for Irrigation Water Quality Table 6-4 Three Options to Demonstrate Control of Nitrogen Compounds Table 6-5 Maximum Contaminant Level (MCL) for Inorganic Compounds Table 6-6 Maximum Contaminant Levels for Radioactivity Table 6-7 Reporting Limits and Action Levels for Lead and Copper Table 6-8 Maximum Contaminant Levels for Organic Compounds Table 6-9 Maximum Contaminant Levels for Disinfection Byproducts Table 6-10 Maximum Contaminant Levels for Secondary Constituents Table 7-1 Cost Opinion for Influent Pump Station Upgrade Table 7-2 Cost Opinions for Screening and Grit Removal Systems Table 7-3 ST-3 FLUMP® Cost Opinion Table 8-1 Cost Opinion and Relative Size for Future Treatment Options Table 8-2 Cost Opinion for Sludge Drying Beds Table 8-3 Cost Opinion for Infiltration Basins Table 11-1 Conceptual Cost Opinions for Facility Improvements Table 11-2 Conceptual Cost Opinions for Process Improvements iii List of Figures Figure 1-1 Site Plan Figure 2-1 Southland Monthly Average Daily Flows and Total Precipitation (Sep 2006 - Aug 2008) Figure 3-1 Influent BOD5 Frequency Diagram Figure 3-2 Influent TSS Frequency Diagram Figure 4-1 Existing Process Flow Diagram Figure 5-1 Frontage Road Trunk Main Study Area Figure 5-2 Frontage Road Trunk Main Hydraulic Profile for Existing Demands Figure 5-3 Composite Service Pump Curve and System Curve Figure 5-4 Frontage Road Trunk Main Hydraulic Profile for 2030 Projected Demands Figure 5-5 Treatment Plant Hydraulic Profile for 2030 Peak Day Flow Figure 7-1 Top view Hycor® Helisieve® Figure 7-2 Profile view AquaGuard® Figure 7-3 Jones & Attwood JetAir® and Screw Classifier Figure 7-4 Conceptual Schematic of Pond with Sump Figure 7-5 Severe Duty Flump® Operating on Traverse System to Dredge a Pig Lagoon Figure 7-6 ShoreMaster’s Polydock® Figure 8-1 Expansion of Aerated Ponds Process Flow Diagram Figure 8-2 Alternate 1: Site Plan for Aerated Ponds Figure 8-3 Biolac® Conversion Process Flow Diagram Figure 8-4 Alternate 2: Site Plan for Biolac® Figure 8-5 Comparative Life-Cycle Costs of an Aerated Ponds System and a Biolac® System Figure 8-6 Completely Mixed Activated Sludge Process Flow Diagram Figure 8-7 Alternates 3 & 4: Site Plan for Activated Sludge and Oxidation Ditch Figure 8-8 Oxidation Ditch Process Flow Diagram iv EXECUTIVE SUMMARY Introduction The Nipomo Community Services District (District) owns and operates the Southland Wastewater Treatment Facility (WWTF), which treats a combination of domestic and commercial wastewater from the community of Nipomo, California. The WWTF has a permitted capacity of 900,000 gallons per day (gpd) based on the maximum monthly demand. Wastewater is treated by four aerated ponds and discharged to onsite infiltration basins. On February 7, 2006 the District received a Notice of Violation (NOV) from the Regional Water Quality Control Board (RWQCB) for several effluent water quality violations reported during 2005. This is the third of a series of reports AECOM (formerly Boyle Engineering) performed in response to the NOV (following the Action Plan, May 2006, and Technical Memorandum, July 2006). This report comprises the WWTF Master Plan, which was prepared to assist
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