2005 Annual Monitoring Report
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City of Morro Bay and Cayucos Sanitary District OMFFSHORE ONITORING ANDRP EPORTING ROGRAM 2005 ANNUAL REPORT Pt. Piedras Blancas Pt. BuchonPt. Piedras 19°C Blancas 18 17 Estero Bay 16 15 Estero Bay Sea Surface 14 Pt. BuchonTemperature 13 15 April 2004 12 11:32:06 PDT 11 ace Sea Surface ture Temperature 003 4 October 2005 PDT 11:25:10 PDT Marine Research Specialists 3140 Telegraph Rd., Suite A Ventura, California 93003 Report to City of Morro Bay and Cayucos Sanitary District 955 Shasta Avenue Morro Bay, California 93442 (805) 772-6272 OMFFSHORE ONITORING AND RPEPORTING ROGRAM 2005 ANNUAL R EPORT Prepared by Douglas A. Coats and Bonnie Luke ()Marine Research Specialists and Bruce Keogh ()Morro Bay/Cayucos Wastewater Treatment Plant 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] February 2006 marine research specialists 3140 Telegraph Rd., Suite A • Ventura, CA 93003 • (805) 644-1180 Mr. Bruce Keogh 15 February 2006 Wastewater Division Manager City of Morro Bay 955 Shasta Avenue Morro Bay, CA 93442 Reference: 2005 Annual Monitoring Report Dear Mr. Keogh: Enclosed is the referenced report. It documents the continued effectiveness of the treatment process, the absence of marine impacts, and compliance with the discharge limitations and reporting requirements specified in the NPDES discharge permit. Please contact the undersigned if you have any questions regarding this report. Sincerely, Douglas A. Coats, Ph.D. Project Manager Enclosure (Seven Copies) I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the sys- tem, or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. Mr. Bruce Ambo City of Morro Bay Date 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 ........................................................................... 2-3 2.1.1 Operations................................................................................................................2-3 2.1.2 Plant History............................................................................................................2-8 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 .............................................................................2-16 Industrial Waste Survey .....................................................................................2-16 Public Outreach ..................................................................................................2-18 Source Identification ..........................................................................................2-19 2.2 WASTEWATER CHARACTERIZATION ....................................................................... 2-20 2.2.1 Flow Rate ...............................................................................................................2-23 Overtotalized Flow .............................................................................................2-24 Inflow and Infiltration ........................................................................................2-25 Population-Related Flow Events ........................................................................2-27 2.2.2 Suspended Solids, Turbidity, and Settleable Solids ...........................................2-28 2.2.3 Biochemical Oxygen Demand...............................................................................2-31 2.2.4 pH............................................................................................................................2-33 2.2.5 Oil and Grease .......................................................................................................2-34 2.2.6 Temperature ..........................................................................................................2-35 2.2.7 Ammonia................................................................................................................2-35 2.2.8 Residual Chlorine..................................................................................................2-35 2.2.9 Coliform Bacteria..................................................................................................2-36 2.2.10 Effluent Toxicity....................................................................................................2-37 2.2.11 Pathogens ...............................................................................................................2-40 i TABLE OF CONTENTS (Continued) Page 2.2.12 Chemical Contaminants........................................................................................2-41 Trace Metals .......................................................................................................2-42 Synthetic Contaminants......................................................................................2-43 Bis 2-Ethylhexyl Phthalate (BEHP) ...................................................................2-43 Cyanide...............................................................................................................2-44 Dioxin.................................................................................................................2-44 Radioactivity ......................................................................................................2-45 2.2.13 Mass Loading.........................................................................................................2-45 2.3 BIOSOLIDS ................................................................................................................. 2-46 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.........................................................................................3-4 3.1.4 Navigation ................................................................................................................3-8 3.1.5 Sampling Equipment and Methodology..............................................................3-10 Ancillary Measurements.....................................................................................3-10 Instrumental Measurements................................................................................3-11 3.1.6 Data Analysis .........................................................................................................3-12 3.2 DISPERSION OF EFFLUENT WITHIN RECEIVING WATERS ....................................... 3-13 3.2.1 Zone of Initial Dilution..........................................................................................3-14 3.2.2 Critical Initial Dilution Ratio ...............................................................................3-14 3.2.3 Regional Oceanographic Processes......................................................................3-16 3.2.4 Ambient Water Properties....................................................................................3-18 Density, Temperature, and Salinity ....................................................................3-18 Dissolved Oxygen ..............................................................................................3-21 pH .......................................................................................................................3-21 Turbidity.............................................................................................................3-21 3.3 EFFECTS OF DISCHARGE.........................................................................................