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Morro Bay/Cayucos Wastewater Treatment Plant 2015 Annual City of Morro Bay and Cayucos Sanitary District OFFSHORE MONITORING AND REPORTING PROGRAM 2015 ANNUAL REPORT Pt. Piedras Sea Surface Temperature Blancas 21 October 2015 25°C 24 Estero Bay 23 22 21 Pt. Buchon 20 19 18 17 16 15 Pt. Arguello Marine Research Specialists 3140 Telegraph Rd., Suite A Ventura, California 93003 Report to the City of Morro Bay and Cayucos Sanitary District 955 Shasta Avenue Morro Bay, California 93442 (805) 772-6272 OFFSHORE MONITORING AND REPORTING PROGRAM 2015 ANNUAL REPORT Prepared by Douglas A. Coats Submitted by Marine Research Specialists 3140 Telegraph Rd., Suite A Ventura, California 93003 Telephone: (805) 644-1180 Telefax: (805) 289-3935 E-mail: [email protected] March 2016 TABLE OF CONTENTS Page LIST OF FIGURES ......................................................................................................................................... v LIST OF TABLES ......................................................................................................................................... vii LIST OF ACRONYMS .................................................................................................................................... ix EXECUTIVE SUMMARY .................................................................................................... ES-1 1.0 INTRODUCTION .............................................................................................................. 1-1 1.1 REPORT ORGANIZATION ............................................................................................ 1-1 2.0 TREATMENT PLANT PERFORMANCE ..................................................................... 2-1 2.1 WASTEWATER TREATMENT PLANT ........................................................................... 2-2 2.1.1 Operations ................................................................................................................ 2-3 2.1.2 Plant History ............................................................................................................ 2-7 2.1.3 Regulatory Setting ................................................................................................. 2-11 2.1.4 Description of the Treatment and Outfall System .............................................. 2-14 2.1.5 Pollution Prevention Program ............................................................................. 2-15 Industrial Waste Survey ..................................................................................... 2-15 Public Outreach .................................................................................................. 2-17 Source Identification .......................................................................................... 2-18 2.2 WASTEWATER CHARACTERIZATION ....................................................................... 2-19 2.2.1 Flow Rate ............................................................................................................... 2-19 2.2.2 Suspended Solids, Turbidity, and Settleable Solids ........................................... 2-22 2.2.3 Biochemical Oxygen Demand ............................................................................... 2-25 2.2.4 Oil and Grease ....................................................................................................... 2-26 2.2.5 pH ........................................................................................................................... 2-27 2.2.6 Temperature .......................................................................................................... 2-28 2.2.7 Ammonia ................................................................................................................ 2-29 2.2.8 Residual Chlorine .................................................................................................. 2-29 2.2.9 Coliform Bacteria .................................................................................................. 2-30 2.2.10 Toxicity ................................................................................................................... 2-32 2.2.11 Nutrients ................................................................................................................. 2-32 2.2.12 Chemical Compounds ........................................................................................... 2-34 Trace Metals ....................................................................................................... 2-35 Selenium ............................................................................................................. 2-35 Radionuclides ..................................................................................................... 2-36 Phenolic Compounds .......................................................................................... 2-36 2.3 BIOSOLIDS ................................................................................................................. 2-36 2.3.1 Solids Treatment Process ...................................................................................... 2-37 2.3.2 Chemical Compounds ........................................................................................... 2-38 i TABLE OF CONTENTS (Continued) Page 3.0 RECEIVING WATER QUALITY ................................................................................... 3-1 3.1 MONITORING PROGRAM ............................................................................................ 3-1 3.1.1 Objectives of Sampling ........................................................................................... 3-1 3.1.2 Scope of Monitoring ................................................................................................ 3-2 3.1.3 Sampling Station Design ......................................................................................... 3-5 3.1.4 Navigation ................................................................................................................ 3-7 3.1.5 Sampling Equipment and Methodology ................................................................ 3-8 Auxiliary Measurements ...................................................................................... 3-8 Instrumental Measurements .................................................................................. 3-8 3.2 PLUME DISPERSION .................................................................................................. 3-10 3.2.1 Zone of Initial Dilution.......................................................................................... 3-11 3.2.2 Critical Initial Dilution Ratio ............................................................................... 3-12 3.2.3 Regional Oceanographic Processes ...................................................................... 3-13 3.2.4 Ambient Seawater Properties ............................................................................... 3-16 3.3 COMPLIANCE EVALUATION ...................................................................................... 3-20 3.3.1 Screening for Applicability ................................................................................... 3-20 Measurement Location ....................................................................................... 3-20 Presence of Wastewater Constituents ................................................................. 3-21 Natural Variation ................................................................................................ 3-22 3.3.2 Numerical Limits ................................................................................................... 3-23 COP Objectives .................................................................................................. 3-23 Basin Plan Limits ............................................................................................... 3-25 3.3.3 Other Lines of Evidence ........................................................................................ 3-26 Mixing Performance ........................................................................................... 3-27 Limited Discharge Volume ................................................................................ 3-28 Effluent Quality .................................................................................................. 3-28 3.3.4 Visual Observations .............................................................................................. 3-30 3.4 BENEFICIAL USE ....................................................................................................... 3-30 4.0 MARINE SEDIMENTS AND BENTHIC BIOTA .......................................................... 4-1 4.1 MONITORING PROGRAM ............................................................................................ 4-1 4.1.1 Scope of Monitoring ................................................................................................ 4-1 4.1.2 Sampling Station Design ......................................................................................... 4-3 4.1.3 Benthic Sample Collection and Processing ........................................................... 44- Equipment ............................................................................................................ 4-4 Physicochemical Samples .................................................................................... 4-5 Infaunal Samples .................................................................................................
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