Skip to content
Herrera
  • Team
  • Story
  • Projects
  • Publications
  • Services
  • Blog
  • DEIBA
  • Careers
  • Contact
Toggle search

Green Lake Integrated Phosphorus Management Plan and Alum Treatment Design

Since the 1990s, Herrera has monitored Green Lake and its watershed, developed the water and nutrient budgets, conducted diurnal studies of internal phosphorus loading, monitored the lake and educated the public on effects of an aluminum sulfate (alum) treatment, and prepared specifications for aquatic plant harvesting. In response to extensive toxic cyanobacteria blooms in the early 2000s, Herrera provided planning, permitting, engineering, and monitoring services to support a proposed alum treatment of Green Lake. This included a comprehensive study to determine the optimum approach to treating Green Lake with alum by evaluating historical data and relevant literature, and conducting tests to select the alum dose and develop treatment specifications and costs. Herrera provided technical oversight of engineering services, conducted all water quality monitoring during and after the 2004 alum treatment, prepared the treatment evaluation report. Herrera continued to provide expert limnological support services for Green Lake including collection and evaluation of sediment core data, development of a bioturbation model for predicting impacts of carp on internal loading of phosphorus, design and implementation of a stormwater monitoring program, aquatic plant evaluations, and pollutant source tracking. Because toxic cyanobacteria increased 10 years after the 2004 alum treatment, Herrera conducted statistical analysis of historical phytoplankton data collected since 1952 showing, recommended another alum treatment, and updated algae bloom monitoring and lake closure protocols. Herrera collected more sediment core data, prepared a plan for the third alum treatment in 2016, provided oversight, monitoring, and reporting of the 2016 treatment.

Location
Seattle, WA
Owner
City of Seattle - Parks and Recreation
Project Contact
Rob Zisette
Services
Aquatic Ecology
Project Type
Environmental Science
http://herrerainc.com/wp-content/uploads/2013/12/Green-Lake-Alum-Treatment2.mp4

Related Projects

View all projects →

Trophic Cascade Effects on Algae Blooms in Washington State

→

White River at Pacific Right Bank Flood Protection Project Planning and Design

→

Boise Creek Golf Course Restoration Final Design

→

Hidden Lake Dam Removal

→

Lake Sammamish Snorkeling Survey

→

City of Kenmore Integrated Aquatic Vegetation Management Plan

→

Navigation

  • Team
  • Story
  • Projects
  • Publications
  • Services
  • Blog
  • Careers
  • Contact
  • Search

Our Offices

Seattle, WA

2200 Sixth Avenue
Suite 1100
Seattle, WA 98121
Phone (206) 441-9080
Contact: Alice Lancaster

Portland, OR

107 SE Washington Street
Suite 140
Portland, OR 97214
Phone (503) 228-4301
Contact: Ellen McClure

Missoula, MT

101 East Broadway
Suite 610
Missoula, MT 59802
Phone (406) 998-6760
Contact: Heidi Houck

Bellingham, WA

1329 North State Street
Suite 200
Bellingham, WA 98225
Phone (360) 398-5075
Contact: Chris Webb

Davis, CA

508 Second Street
Suite 208
Davis, CA 59802
Phone (971) 200-8876
Contact: Kate Forester


Casper, WY

444 S. Center St.
Casper, WY 82601
Phone (307) 823-6919
Contact: Mark Gentry

LinkedInFacebookTwitterInstagram

Join our Newsletter

Copyright © 2025 Herrera Environmental Consultants - Made by Needmore