SAN JOAQUIN RIVER Dissolved Oxygen Total Maximum Daily Load

Discriminating Between West-Side Sources of Nutrients and Organic Carbon Contributing to Algal Growth and Oxygen Demand in the San Joaquin River

Executive Summary

Table of Contents

List of Figures

List of Tables

List of Acronyms, Abbreviations, and Definitions

Section I – Introduction

Component of low dissolved oxygen problem addressed in this study

Characteristics of the project

Conceptual model

Importance to solving the low dissolved oxygen problem

Key point of the project Scope of Work

Section II – Background Information

Section III – Methods and Approaches

Research area description

Sample sites

Materials and methods

Data Analysis

Section IV – Results and Discussion

Comparison of sources of BOD and Algae in the Grasslands Watershed.

Importance of Mud Slough and Salt Slough to BOD loads observed in the SJR

Changes in water quality between sampling points

Algal growth and BOD production in the San Luis Drain

Characteristics of BOD in the Grasslands Watershed

Water Quality Parameter

Section V – Implementation of Results

Section VI – Additional Studies Needed

Section VII – Conclusions and Recommendations

Section VIII – Acknowledgements

Section IX – Literature Cited

Stringfellow & Quinn

List of Figures

Figure III-1: Map of the study region. Site A (entrance to San Luis Drain Bypass) and

Crows Landing represent the most southern and northern sampling sites discussed in

this report.

Figure III-2: Map of sampling sites for agricultural and wetland drainage discussed in this

report. Site A (entrance to San Luis Drain Bypass) and Crows Landing on the San

Joaquin River are outside of map area (see Figure III-1).

Figure IV-1: Flow as a function of time for the three major drainages of the West-Side

region between June 13th and October 4th, 2001

Figure IV-2: BOD10 loading as a function of time for the three major drainages of the

West-Side region between June 13th and October 4th, 2001.

Figure IV-3: Chlorophyll a concentration as a function of time for the influent (Site A)

and effluent (Site B) of the Grasslands Bypass Project between June 13th and

October 4th, 2001.

Figure IV-4: BOD10 concentration as a function of time for the influent (Site A) and

effluent (Site B) of the Grasslands Bypass Project between June 13th and October

4th, 2001.

Figure IV-5: Ammonia-nitrogen concentration as a function of time for the influent (Site

A) and effluent (Site B) of the Grasslands Bypass Project between June 13th and

October 4th, 2001.

Figure IV-6: Dissolved organic carbon (DOC) concentration as a function of time for the

influent (Site A) and effluent (Site B) of the Grasslands Bypass Project between

June 13th and October 4th, 2001.

Figure IV-7: Relationship of TOC and BOD10 for all data collected between June 13th

and October 4th, 2001.

Figure IV-8: Relationship of Chlorophyll a and BOD10 for all data collected between

June 13th and October 4th, 2001.