HomeMy WebLinkAboutContract Mod. no. 3 2021CM-Aquatechnex210428 phoslockKITSAP LAKE CLEANUP
AQUATECHNEX 2021 CONTRACT MODIFICATION
ALGAE CONTROL WITH PHOSLOCK, AND INVASIVE VEGETATION HERBICIDE TREATMENT,
AND AQUATIC VEGETATION HARVESTING
DocuSign Envelope ID: CA29D564-F9FE-4315-9507-20979BADA5C6
2019 CONDITIONS
•TOXIC ALGAE BLOOMS AND EXCESSIVE AQUATIC VEGETATION W/INVASIVE SPECIES
DocuSign Envelope ID: CA29D564-F9FE-4315-9507-20979BADA5C6
2020 PROJECT
•PHOSLOCK APPLIED IN JUNE -60,060 LBS
•PHOSLOCK APPLIED IN AUGUST –30,030 LBS
•HERBICIDE APPLICATION FOR IRIS AND WHITE-WATER LILLY
IN AUGUST
•AQUATIC VEGETATION HARVESTING –12 DAYS IN LATE
JULY THROUGH EARLY AUGUST
DocuSign Envelope ID: CA29D564-F9FE-4315-9507-20979BADA5C6
2020 HARVESTING
The aquatic vegetation harvester collected more than 500 cubic yards
of grass, milfoil, and other plant species from the lake in 12 days.
Removing excess vegetation prevents the release of nutrients, including phosphorus,
as the material decomposes over the winter. This helps reduce free phosphorus used
to feed algae blooms.
DocuSign Envelope ID: CA29D564-F9FE-4315-9507-20979BADA5C6
2020 RESULTS
•90% REDUCTION IN PHOSPHORUS
•>3X WATER CLARITY IMPROVEMENT FROM 3.5’ TO 15’
•NO SIGNIFICANT ALGAL BLOOMS FOR SUMMER SEASON
•IMPROVED WATER CONTACT SAFETY FOR HUMANS,
WILDLIFE, AND PETS
•REDUCED PROPELLOR FOULING FOR BOATERS
•PROJECT COST: $226,000
DocuSign Envelope ID: CA29D564-F9FE-4315-9507-20979BADA5C6
2021 AQUATECHNEX CONTRACT MODIFICATION
•TOTAL CONTRACT COST -$155,000
•SCOPE OF WORK COVERS:
•BASELINE WATER QUALITY SAMPLING AND TESTING
•PHOSLOCK APPLICATION IN LATE MAY-EARLY JUNE, WITH POSSIBLE AUGUST WORK IN DEEP WATER
•AQUATIC HARVESTING –30 DAYS WITH GOAL TO COMPLETE THE ENTIRE LAKE
•HERBICIDE APPLICATION –TOUCH UP AROUND THE LAKE FOR YELLOW FLAG IRIS
•NPDES AQUATIC PERMIT RENEWAL
DocuSign Envelope ID: CA29D564-F9FE-4315-9507-20979BADA5C6
THANK YOU!
•QUESTIONS
DocuSign Envelope ID: CA29D564-F9FE-4315-9507-20979BADA5C6