Minutes 11/18/2016 PELICAN BAY SERVICES DIVISION
WATER MANAGEMENT COMMITTEE MEETING
NOVEMBER 18,2016
The Water Management Committee of the Pelican Bay Services Division met on Friday,
November 18 at 11:00 a.m. at the SunTrust Bank Building, 801 Laurel Oak Drive, Suite 302,
Naples, Florida 34108. The following members attended.
Water Management Committee Scott Streckenbein
Tom Cravens, Chairman Dave Trecker
Pelican Bay Services Division Staff Mary McCaughtry, Operations Analyst (absent)
Neil Dorrill, Administrator Lisa Jacob, Associate Project Manager
Marion Bolick, Operations Manager Barbara Shea, Recording Secretary
Also Present Jeremy Sterk, Earth Tech Environmental
Susan O'Brien, PBSD Board
APPROVED AGENDA (AS AMENDED)
1. Pledge of Allegiance
2. Roll call
3. Agenda approval
4. Approval of 10/20/16 meeting minutes
5. Audience comments
6. Water quality status of lakes (recent reports)
7. Sediment analyses
8. Monitoring Clam Bay for the presence of herbicides used to treat algae in Pelican Bay
lakes.
9. Cost-effectiveness of various treatments
10. More complete information on the "lake spray records"
11. Lakes selected for"microfloc"testing
1-7 (Naples Grande front lake) and 3-5 (The Club Clubhouse lake)
A. Update on three lakes (add-on)
12. Plans to deal with lakebank erosion
13. Adjournment
ROLL CALL
All members were present and a quorum was established
1
Pelican Bay Services Division Water Management Committee Meeting
November 18,2016
AGENDA APPROVAL
Mr. Streckenbein motioned, Dr. Trecker seconded to approve the agenda as
amended with the addition of item #11A. The motion carried unanimously.
APPROVAL OF 10/20/16 MEETING MINUTES
Mr. Streckenbein motioned, Dr. Trecker seconded to approve the 10/20/16 meeting
minutes as presented. The motion carried unanimously.
AUDIENCE COMMENTS
None
WATER QUALITY STATUS OF LAKES (RECENT REPORTS)
Dr. Trecker commented on the November 2016 report by CH2M Hill entitled, "Pelican
Bay Stormwater Lakes Water Quality Monitoring Program: August 2016 Sampling Event Data
Review" and highlighted that there has essentially been no change in total nitrogen and total
phosphorus in Pelican Bay lakes since 2011.
Mr. Cravens commented that all of the continual education of PB residents over the last
five years has resulted in no reduction in nutrients.
Dr. Trecker commented on a telephone conversation he had with Bill Morris who heads a
water management group in Pelican Pointe, a community located just north of Venice, FL, and
commented on their experiences/recommendations/discoveries on aeration, littoral plantings,
chemicals, recycled water, phosphate-containing fertilizers, blue tilapia and shoreline buffers.
SEDIMENT ANALYSES
Dr. Trecker reviewed current lake sediment data in ten lakes as compared to April 2016
and August 2013. He noted that little change is apparent. His conclusions were, (1) nearly all
lake copper (over 99.99%) is in the sediment, (2) soluble copper levels in Clam Bay remain low,
(3) high levels of sediment phosphorus (94 to over 99%) and steady levels of soluble phosphorus
continue to fuel algae growth, and (4) since sediment levels in most lakes tested remain very low
at 1-3% (although levels in lakes 2-9, 2-12, and 1-2 show levels of 13-20%), it appears dredging
will not be needed for decades.
MONITORING CLAM BAY FOR THE PRESENCE OF HERBICIDES USED TO
TREAT ALGAE IN PELICAN BAY LAKES
Mr. Cravens commented on the opinion received from Mr. Donn Brown, President of
Earth Tech Environmental concerning adverse affects from herbicides (Hydrothol 191, Tribune,
and Rodeo) to Clam Bay: Mr. Brown's opinion is that he would find it highly unlikely that these
herbicides could be linked to the die-off in Clam Bay since these chemicals have a half-life of 1-
5 days and therefore, dissipate through microbial degradation.
COST-EFECTIVENESS OF VARIOUS TREATMENTS & MORE COMPLETE
INFORMATION ON THE "LAKE SPRAY RECORDS"
Mr. Cravens commented on staff's continued work on cost analyses of various lake
treatments.
2
Pelican Bay Services Division Water Management Committee Meeting
November 18,2016
LAKES SELECTED FOR"MICROFLOC" TESTING
Mr. Bolick commented that the Naples Grande front lake and the Club Clubhouse lake
have been selected for "microfloc" testing. Ms. Jacob reported that a CH2M Hill proposal for a
"microfloc"trial in two test lakes has been requested but not received.
UPDATE ON THREE LAKES (ADD-ON)
Mr. Cravens provided a powerpoint presentation update on three lakes:
(1) Ridgewood Park Island Lake: Mr. Cravens provided photos of apparent surface
microcystis (cyanobacteria) on this lake which was restocked with blue tilapia in July. Mr.
Bolick commented that this lake will be treated with peroxide within the next few days and that
the lake is scheduled for an aerator installation during this fiscal year.
(2) St. Maarten Lake: Mr. Cravens provided photos of surface algae on this lake, despite
the lake having four aerators. Mr. Bolick commented that this lake will be sprayed within the
next few days.
(3) Community Center Lake: Mr. Cravens provided photos of this lake which was
restocked with blue tilapia in July. No algae was observed. The committee suggested that staff
obtain a list of communities (from our tilapia vendor) using blue tilapia(to treat algae) to contact
to explore their experience with blue tilapia.
Dr. Trecker announced that on Dec. 9 the President's Council will conduct an informal
discussion of lake management for information sharing. Dr. Trecker will attend.
PLANS TO DEAL WITH LAKEBANK EROSION
Staff provided a proposal of$37,200 from Agnoli, Barber & Brundage, Inc. to provide
(1) an analysis/inspection of 47 of the PBSD master system lakes, (2) a sound analysis method to
determine the most logical order of future lake remediation based on risk assessment, and (3)
provide a report summarizing findings and specifics of a future plan for lake remediation. Based
on committee consensus, Mr. Dorrill will obtain a new ABB proposal for an updated study, cross
section surveys, evaluation and proposed plan to mitigate lake bank erosion of only those lakes
measured in 2014.
ADJOURNMENT
The meeting was adjourned at 12:00 p.m.
Tom Cray ns, Chairman
Minutes approved [ /1 as presented OR 1 as amended ON 1- O '02‘, 17 j date
3