HomeMy WebLinkAbout08/31/2004, SS1 - LAGUNA LAKE MOSQUITO ABATEMENT council 8/31/04
j agenda RepoRt
CITY OF SA-N LUIS OBISPO
FROM: Michael D. McCluskey, Director of Public W P60
Prepared By: Todd Beights, Parks & Urban Fore t upervisor
SUBJECT: LAGUNA LAKE MOSQUITO ABATEMENT
CAO RECOMMENDATION
1. Adopt a Resolution calling for the County Board of Supervisors to form a Vector
Control District..
2. Direct staff to prepare and implement a citizen education program on the West Nile
Virus.
3. Direct City staff, within resources currently available, to continue to work with
County staff as needed to assist them in implementing mosquito abatement efforts
using the "tools" currently available, until a District is in place.
4. Direct staff to return with a mid-year budget request for $15,000 for the cost of
helicopter application of larvicide at Laguna Lake in the spring of 2005, if no funds
can be found from the County for this work.
5. Adopt a Resolution calling for State and Federal Funding for Vector Control
Programs.
REPORT-IN-BRIEF
West Nile virus, a mosquito-borne disease that entered the United States on the east coast in
1999, has recently been found within San Luis Obispo County. The disease, which is
transmitted through the bite of an infected mosquito, is particularly dangerous for the elderly,
young children and those with a weakened immune system. Due to an increased alarm over
the spread of this disease, County officials have been working with the City to implement
vector control strategies, such as trapping, monitoring and applying pesticides to selected
sites. One of those sites, Laguna Lake, has presented itself as a difficult site to effectively
treat and eliminate the mosquito threat, prompting the City and the County to evaluate
different options for treatment. This report discusses the problem, what strategies have been
tried, and what the Council could do in the future.
DISCUSSION
Background
In the early 1960's the northern Oceanaire neighborhood was developed. This development
included the diversion of Prefumo Creek into the lake from its natural course, which did not
enter Laguna Lake, and the dedication of the water surface to the City. Prior to that time,a
Laguna Lake Committee had developed a plan for the lake to be used as a warm water
fishery.
Laguna Lake Mosquito Abatement Page 2
In 1964 the Laguna Lakewood Homeowners Association requested that the City take action
to control weeds and insects around Laguna Lake (see Attachment 3 for an aerial view of the
lake). Specifically, residents were concerned about an outbreak of encephalitis in Houston
Texas, carried by mosquitoes. Houston was addressing its problem at the time with aerial
spraying using helicopters. The homeowners felt that the City had obtained the advantages
of annexing the lake and should be responsible for controlling the insect and weed problems.
Over time, other letters followed regarding a problem with midges, a type of insect that is
often confused with mosquitoes.
Apparently, the issue of which agency was responsible for vector control was debated as far
back as 1968. Copies of correspondence between the State Department of Public Health and
the County Health Department at that time indicate the County was responsible for mosquito
control. Based upon a recommended controlled application of chemical insecticide, the
County ultimately instituted some form of control program.
The topic of aquatic weeds in Laguna Lake has been an issue since the late 1960's. The
Laguna Lake Management Plan (circa 1982) devotes a section to weed harvesting, and
estimates a cost for the activity..This effort led to the acquisition of the "Chub", which was
originally acquired specifically for harvesting aquatic weeds. The lake was surveyed for
areas of a particular aquatic weed, known as "Smartweed", and annual harvesting was done
forseveral years in the late 1980's. At the time the program was being developed, it was
determined that an EIR was required to assess the environmental impacts to the lake. The
program was successful in removing "Smartweed" from the lake to the point that it has not
reappeared in amounts that have caused concern. This aquatic weed is not the same as the
bulrush tulles that ring the lake today. The tulles were not harvested at all during that time by
City staff using the "Chub", which is an old piece of equipment that is not capable of
addressing the heavier task.
Current Threat
In 2002, a new disease, called the West Nile virus, began to appear in the eastern United
States and spread rapidly westward. The disease is transmitted by mosquitoes and was found
to affect birds and mammals, including humans. By 2003 the disease had spread as far west
as New Mexico and Colorado, and it was anticipated that it would reach California by 2004.
As of August 10, 2004, a total of 189 West Nile Virus cases had been reported in California
including 5 human fatalities. There has been one reported case of an infected bird found east
of Paso Robles in San Luis Obispo County, and some mosquitoes trapped near Morro Bay
tested positive for the disease. However, no infections of humans, equines or sentinel
chickens have been reported in our County thus far. Public health officials have recognized
the threat and are assuming that cases will reach this County this season and are preparing for
that eventuality.
Current status of efforts so far
City staff was contacted in April 2004 about cooperating with the County on a test of
insecticide applications for Laguna Lake. The insecticide is actually a biological control
agent called Bacillus thuringensis, or B. T., and it can be applied in several different forms.
It is commonly used in insect control because of its specific nature and very low or
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Laguna Lake Mosquito Abatement Page 3
nonexistent threat to not-target species. It is generally used against larval forms of the insects
and thus is referred to as a larvicide. County of San Luis Obispo personnel carried out 4
applications of the granular larvicide using the City's utility watercraft. Post-application
sampling indicated there was no change in the volume of insects. This method proved to be
ineffectual due to the large mass of dead and matted material along the lake edge. The
material prevented the larvicide from reaching the water surface where the larvae live.
County staff then attempted to access the lake shallows but found that in many areas, mats of
dead reeds lay in areas as deep as 3 feet. A manual application test resulted in less than I %
of the granules reaching the water surface.
In a meeting with City staff in July, County staff indicated potential breeding sites also
existed at the Wastewater Treatment Facility and "various storm drains Citywide. Traps set at
some locations within the City indicated high concentrations of adult mosquitoes, none
infected with the West Nile virus. Further investigation is being carried out to identify these
locations and come up with effective treatment options(see Attachment 4 for the summary of
County efforts to date).
During July, the City hosted a multi-agency informational meeting presented by County
Health to share information on what is going on and the best ways to reduce risks. This
provided valuable information to City staff and allowed us to better answer questions about
West Nile Virus received from the public.
Potential Strategies
County of San Luis Obispo Strategies
At the July meeting staff from San Luis Obispo County stated they are considering the
following alternatives:
1. Aerial application (by helicopter) of the granular insecticide product followed by a
subsequent fly-over"rotor wash" in an attempt to penetrate the reeds.
Pros—Relatively simple to apply with minimal impact to neighbors.
Cons—It is a two-step process. It is uncertain whether the product will penetrate the reed
mat with greater success than the previous attempt. The process would have to be
repeated. The benefit realized by treating so late in the season clearly doesn't justify the
costs.
Cost - Based on information supplied by the County a large scale aerial application of
biological larvicides would cost.approximately $3,000 to $4,000 per application. A
minimum of three applications are recommended at this point costing an estimated total
of$9,000 to $12,000 (see Attachment 5 for Helicopter cost estimates). This estimate is
based on the County's agreement to supply the appropriate amount of the recommended
larvicide and City staff assisting in transportation and loading.
2. Aerial application of a liquid product followed by a water wash to penetrate the mat.
Pros—There is minimal impact to neighbors..
Cons — It is a two-step process. Greater penetration of the mat to a larger degree seems
unlikely. Product would be diluted to unknown levels by water wash. Clearance would
first be required from regulatory agencies depending upon the water source for the
� 3
Laguna Lake Mosquito Abatement Page 4
washing. The process would have to be repeated. It was determined that this application
technique was not an effective option due to the lack of control in metering proper
concentrations of the product. Controlling drift was another issue.
Cost—Same per application cost as listed above.
3. Vegetation control, by removing the active reed growth to allow granular material to get
to the water surface.
Pros — This option is probably the most effective of all options in making sure that the
larvicide applied later can get to the water surface.
Cons — This option is the most expensive of all options and would only be good for
approximately two seasons after which the reeds would have to be cut back again. The
harvested plant material would have to be removed and processed. The cutting would
still be followed by larvicide application, although it could be done in a more inexpensive
manner than by helicopter. This option would require environmental review by the Army
Corps, Fish and Game,NOAA Fisheries and the US Fish and Wildlife Service.
Cost - The cost of harvesting and removing the active bulrush growth is very expensive
and time consuming. Removal of the entire plant structure, inclusive of the root mass,
guarantees the plant will not obstruct future larvicide applications if required. The re-
growth average, post removal, is less than 10% and could possibly be managed in house.
A rough estimate received from a qualified lake management firm places the cost to
remove the bulrush conservatively at over $2,000,000. It would take approximately 300
working days to complete and does not address the issue of final material disposition (see
Attachments 6 and 7 for examples of reed harvesting equipment). City staff inquired
about the possible purchase of the harvesting equipment in order to perform the work
ourselves. The "Aquamog" as it is called, would cost $350,000 to purchase. Two full-
time staff positions ($120,000 for regular employees or $55,000 for exempt temporary
employees), would be required to operate and support the equipment, along with the cost
of hauling and disposal of the harvested reeds, which could be conservatively estimated
at $150,000.
Other options reviewed by City staff:
1. Public education by either the County or the City on avoiding contact with mosquitoes.
Information is available at a State of California website: www.westnile.ca.gov
Pros — This is the least expensive option and addresses the concern for disease, safety
precautions and benefits the public as they travel to other areas. Materials are already
prepared for publication and distribution.
Cons — It does not reduce the mosquito population. The information does not always
reach the public.
2. Fogging the lake area and neighborhoods with an adulticide.
Pros — This would address the adult mosquito population regardless*of the condition of
the lake or the ability to get a larvicide to the larvae on the water surface.
Cons — This has a very negative public image when neighborhoods are sprayed. This is
also not generally viewed as highly effective due to the ability of the mosquitoes to travel
to and from the area. In addition, mosquitoes not present at the time of spraying are not
killed.
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Laguna Lake Mosquito Abatement Page 5
3. Introducing mosquito fish(Gambusia affinis) into the lake.
Pros — Mosquito fish can be effective in small, contained water bodies. They have a
voracious appetite for mosquito larvae.
Cons—According to City Natural Resource Management staff, the fish breed quickly and
can compete with other aquatic life. They.have a tendency to eat the larvae of beneficial
insects, as well as tadpoles of native frogs such as tree frogs. The effectiveness of this
type of control at the lake is not known. There may also be regulatory issues governing
the release of these fish in a body of water that has a connection to live streams.
Practically speaking, the fish would have a difficult time penetrating the dense, moist
areas of matted material.
4. Burning the bulrush stands to remove vegetation and gain access for pesticide
application.
Pros — This could possibly eliminate a portion of the obstructing bulrush growth and
allow limited access for application of pesticides, thus modifying the aquatic habitat and
making predation on mosquito larvae much easier
Cons — Burning of green waste is banned by San Luis Obispo County Air Pollution
Control District Rule 501. Even if an exemption were granted, the material would have to
be harvested, removed, and dried prior to burning. The burning option would still need to
be followed with the larvicide application.
What are other agencies doing about the problem?
In reviewing what other agencies are doing, staff found the County of San Diego has a
combination of circumstances much like Laguna Lake and success in reducing mosquito
populations. Their strategy/program consists of three aerial applications of granular lavicide
starting early in season. The cost is $38,000 annually to cover 550 acres. The three
applications are approximately three weeks apart. They have had promising success in aerial
applications to marsh settings very similar to Laguna Lake. Follow up counts of mosquitoes
indicate a significant decrease in the number of adult mosquitoes. (See Attachments 8
through 12 depicting the 5 year historic mosquito counts, pre and post treatment at five
different lake locations).
Responsibilities
Historically the City has never monitored or treated any of its open space or parkland to
control mosquito populations. Unfortunately, San Luis Obispo County is one of the few
Counties in the State that does not have a Vector Control District, and as such there is no
clear-cut agency responsibility. Traditionally and historically, counties have assumed
responsibility for vector control , within their boundaries; because vectors — such as
mosquitoes don't observe city limit boundaries, and our County has likewise done the same.
The City has no legal responsibility to participate in a mosquito abatement program with the
County, however we are cooperating with County personnel and assist them when needed
inside the City limits.
The following was copied from the County Environmental Health Services web site defining
the purpose of their program:
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Laguna Lake Mosquito Abatement Page 6
Control of Disease-bearing Insects and Rodents (Vector Surveillance)
The purpose of this program is to protect the health and safety of the citizens of San Luis
Obispo County by monitoring the presence of disease bearing animals (vectors) and
coordinating activities with State Health officials, the Agriculture Commissioner, and the
pest control industry.
Recommendations
By law, the City is not responsible for vector control. However, since Laguna Lake is a City
responsibility and mosquito populations will breed in any area of stagnant water, what can
and should the City of San Luis Obispo do?
First and foremost, we should be pushing for the formation of a true countywide Vector
Control District. Given the problems associated with West Nile virus, it is time that county
residents recognize the issue and approve of the formation of a district (see Attachment 13
for the process to form a District). County staff indicate that they are preparing a September
Board of Supervisors item for this purpose. Staff has prepared a Resolution (Attachment 1)
for Council adoption urging the County Board of Supervisors to initiate the process.
Second, we should educate our own residents of the problems associated with the West Nile
virus and what steps are currently under way with the County and the City. Council should
encourage support of the formation of the Vector Control District. Likewise, we should
provide information to our citizens regarding the lethal affects of the virus versus other
diseases (60,000 deaths by Flu versus 300 for West Nile Virus nationwide) to bring more
balance and less panic in response to the problem.
Third, since any vector control program this late in the season would be minimally
productive and a waste of resources and funding (mosquito production drops significantly
from September to a virtual stop in November), do not pursue any such program this calendar
year. Instead, focus on preventative steps such as education and tracking, and County
cooperation in planning and instituting a program to begin next spring/summer at the
beginning of the mosquito breeding season. City staff will submit a mid-year budget request
in the amount of$15,000 to pay for several helicopter applications of a selected larvicide in
order to reduce the mosquito population at Laguna Lake, in case a Vector Control district
cannot be formed by that time., The City's role in the overall program should be limited to
staff participation in cooperative efforts and a heavy emphasis on education using the various
resources at our disposal (mailers, channel 20, etc.).
Fourth, support efforts by the State to obtain Federal grant funding. We should also request
grant funding from the State for all Counties to fight the West Nile virus. Thus far, after
extensive research by staff, no state grant funding for this kind of endeavor has been found
(unless it for an established Mosquito Abatement District) and, in reality, this problem is
more than a county problem: it is a state wide problem. Legally, counties are divisions of the
State and thus the State should take more responsibility to address a statewide problem.
There is current legislation, Senate Joint Resolution 33, which asks the Federal government
Laguna Lake Mosquito Abatement Page 7
to fund agencies in their efforts to eliminate West Nile virus. Staff has provided a second
Resolution (Attachment 2) to be sent to State politicians and the Governor, supporting this
legislation and requesting responsible action on this issue.
CONCURRENCES
County staff has provided much of the information reviewed in this report, and will be
present at the City Council meeting on August 31.
FISCAL IMPACT
Should the Council wish to initiate a meaningful City abatement program, in the absence of
grant funded programs (which typically offer"one-time" resources anyway), the only source
of ongoing City support would be from the General Fund. However, the timing could not be
worse for the General Fund to take on such a new, very large responsibility.
With the adoption of the 2004-05 Budget, several operating and capital cuts were made and
hiring and travel "chills" instituted. Preparation is also underway to cope with at least two
more years of annual State takeaways (nearly $700,000 each year) and other local fiscal
challenges. Thus, the City's General Fund is simply not in a position to support the start-up
and ongoing support of a new, major program at this time.
The bottom line for our city, along with other areas of the County facing similar challenges,
is that a new, dedicated source of funding is needed specifically to combat the mosquito and
other pest problems. The funding method used by other counties has been to form "vector
control districts". In fact, the County of San Luis Obispo is one of the few counties in the
State of California that does not have such a district.
Several months ago, County staff recommended to the Board of Supervisors that the
formation of a vector control district be placed on the November 2004 ballot, but the Board
declined to do so. Since then, however, West Nile Virus has become a significant Statewide
health concern, and therefore the Board may be more inclined to support such a measure at
this time. Staff has prepared a resolution for adoption by the Council urging them to do so.
An effective ongoing mosquito abatement program really depends upon regional strategies
and the availability of dedicated ongoing resources. Only a new countywide vector control
district can provide these requirements.
The cost to the City General Fund so far has been limited to the staff and equipment cost
spent helping the County in its efforts to track, monitor and treat the problem.
Staff will submit a mid-year budget request in the amount of$15,000 to fund the helicopter
application of larvicide at Laguna Lake, in the event that there is no funding available from
the County for that purpose.
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Laguna Lake Mosquito Abatement Page 8
ALTERNATIVES
1. Do nothing at this time. Take a wait-and-see approach, continue monitoring traps and
sentinel chicken flocks, and educate the public on the use of DEET based insect
repellents.
2. Continue moving forward in assisting the County in the establishment of a Mosquito
Abatement District or a Benefit Assessment District to fund ongoing vector control
concerns.
ATTACHMENTS
1 Resolution to form a Vector Control District
2 Resolution calling for State and Federal Funding
3 Laguna Lake aerial view
4 San Luis Obispo County summary of control efforts to date at Laguna Lake.
5 Helicopter Cost Estimates for Laguna Lake Treatment from County.
6-7 Aquatic harvesting equipment.
8-12 San Diego County mosquito treatment documentation graphs.
13 Benefit Assessment District Formation Steps from County.
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ATTACHMENT 1
RESOLUTION NO. (2004 Series)
A RESOLUTION OF THE COUNCIL OF THE CITY OF SAN LUIS OBISPO
REQUESTING THAT THE SAN LUIS OBISPO COUNTY BOARD OF SUPERVISORS
SUPPORT THE FORMATION OF A VECTOR CONTROL DISTRICT
WHEREAS, It has been found that the disease West Nile virus, a serious threat to the health
of our community, has been discovered within San Luis Obispo County; and
WHEREAS, West Nile virus has caused the deaths of at least four people with the State of
California, and infected over one hundred more; and
WHEREAS, the West Nile virus is spread to people and animals by mosquitoes infected
with the disease; and
WHEREAS, other health problems associated with mosquitoes and other pests can only be
effectively addressed in a regional fashion; and
WHEREAS, the County of San Luis Obispo is one of the only counties within the State that
currently does not have a Vector Control District in place.
NOW, THEREFORE, BE IT RESOLVED by the Council of the City of San Luis Obispo
that the formation of a Vector Control District within the County of San Luis Obispo should have a
high priority with the Board of Supervisors and should be authorized for voter approval at their
earliest possible time.
Upon motion of , seconded by
and on the following roll call vote:
AYES:
NOES:
ABSENT:
The foregoing resolution was adopted this day of , 2004.
David F. Romero, Mayor
ATTEST:
Audrey Hooper, C.M.C.
City Clerk
APPROVED AS TO FORM:
Jona . Lowell
City Attorney
R
ATTACHMENT 2
RESOLUTION NO. (2004 Series)
A RESOLUTION OF THE COUNCIL OF THE CITY OF SAN LUIS OBISPO
REQUESTING THAT THE ELECTED REPRESENTATIVES OF THE UNITED STATES
AND THE STATE OF CALIFORNIA ALLOCATE FUNDS TO.RESEARCH,MONITOR
AND ELIMINATE WEST NILE VIRUS IN CALIFORNIA
WHEREAS, West Nile virus is a mosquito-borne disease that, when transmitted to humans,
can cause severe illness, neurological damage, and possible death, especially in the young, the
elderly, and the immunocompromised; and
WHEREAS, West Nile virus has caused the deaths of at least four people with the State of
California, and infected over one hundred more; and
WHEREAS, West Nile virus continues to spread rapidly throughout the state with new
discoveries of infected humans, birds, horses, and mosquito pools everyday almost daily; and
WHEREAS, the California State Senate has proposed Senate Joint Resolution (SJR) 33
calling for the Federal government to make funds available for the research, monitoring and
elimination of West Nile virus; and
WHEREAS, there currently is no program for grant funding for counties without Vector
Control Agencies to help control the spread of West Nile virus; and
WHEREAS,the United States Health and Human Services Agency has primary jurisdiction
for protecting the health of all Americans and providing essential human health services for national
health emergencies and has made emergency funds and grants available since 1999 specifically for
the purpose of aiding states in the fight against West Nile virus.
NOW,THEREFORE,BE IT RESOLVED by the Council of the City of San Luis Obispo
that the Legislature of the State of Califomia requests the President of the United States,the Director
of the Federal Emergency Management Agency, the Secretary of the United States Department of
Agriculture, and the Secretary of the United States Health and Human Services Agency to make
available federal funds for the purposes of surveillance,prevention, abatement, and control of
mosquitoes in California; and be it further
RESOLVED,that these funds be made available immediately to aid in the fight against West Nile
virus in the State of California for the protection of the public health and welfare; and be it further
RESOLVED, that the City Clerk transmit copies of this resolution to the local elected
representatives of the United States Government and the State of California.
Upon motion of , seconded by
and on the following roll call vote:
AYES:
NOES:
ABSENT:
The foregoing resolution was adopted this day of 12004.
R
\J.
Resolution No. (2004 Series)
Page 2
David F. Romero, Mayor
ATTEST:
Audrey Hooper, C.M.C.
City Clerk
APPROVED AS TO FORM:
e
Jon t . Lowell
City Attorney
ATTACHMENT 3
Laguna Lake Area Ca] cdation
y
Water Area: 112 Acres
Reed Area: 75 Acres
Area calculated by digitizing orthophoto from AirPhoto USA.
Small pockets of water are ignored
Photo was taken on 3/31/2004.
Calculated areas are rounded to nearest whole number
DY 20040617
ATTACHMENT 4
SUMMARY TO DATE OF MOSQUITO SURVEILLANCE AND CONTROL
EFFORTS AT LAGUNA LAKE, SAN LUIS OBISPO 6-14-04
Background In 2003, due to the increasing threat of West Nile Virus in California, San
Luis Obispo County initiated a West Nile Virus Surveillance program. The program
consisted of two sentinal chicken flocks and live mosquito trapping and testing, in
coordination with the California State Arbovirus Surveillance Program. There had been
no formal mosquito abatement or surveillance program prior to this date.
In 2004, the county Board of Supervisors approved a budget to create a mosquito
abatement program in addition to the surveillance program. Plans were formalized and
areas prioritized to begin treating mosquito larvae, using biological larvicides.
Geographic areas in the county were evaluated based on historical complaint and trapping
data, numbers of population affected, and likely presence of the most likely vector of
West Nile Virus, primarily Culex tarsalis and other species of Culex. Geographic areas
that include populations of elderly individuals, schools, and rest homes near the mosquito
breeding sites, were given highest priority for treatment. Laguna Lake in the City of San
Luis Obispo met the criteria for treatment based on population numbers, the presence of
two schools, mobile home parks that contain elderly populations, number of complaints
and the presence of Culex mosquitoes.
Laguna Lake is a natural lake that is fed by rainfall coming primarily from Prefumo
Creek. The lake currently consists of about 112 acres of water surface area, surrounded
by about 75 acres of tule vegetation. The open area of the lake does not support mosquito
breeding due to the high winds that occur,but the tules provide a protected area in which
mosquito larvae survive.
In 2003, A surveillance trapping site was established at a residence on Descanso St., near
the Laguna Middle School. Large numbers of Culex erythrothorax(the tule mosquito)
were trapped at this residence.
Current. When the abatement program began in May 2004, and a large number of
complaints came in about the mosquitoes, treatment at Laguna Lake was initiated. With
the assistance of the City of San Luis Obispo Parks Department, a pontoon boat was
utilized to access the inner portions of the lake, and the granulated biological larvicide,
Vectobac, was spread into the tules using backpack blowers. The distance that the
product was able to penetrate into the depth of the tules was only about 10-15 feet. In
conjunction with the treatment, a trap was set at the residence on Descanso to document
trends in numbers.
A summary of trapping and treatment activities during 2004 are indicated on the
following page:
/-l3
A7TAcHMet� T 4
Synopsis of trap and treatment activity at Laguna Lake, to date:
DATE NUMBER OF MOSQUITOES IN TRAP
3-20-04 50 Culex erythrothorax
4-07-04 500 Culex erythrothorax
4-24-04 500 Culex erythrothorax
4-24-04 500 Ochlerotatus washinoi (a
univoltine species)*
5-07-04 500 Culex erythrothorax
TREATMENT 5-07-04 160 LBS. VECTOBAC
5-16-04 500 Culex erythrothorax
5-16-04 150 Ochlerotatus washinoi
TREATMENT 05-21-04 175 LBS. VECTOBAC
5-28-04 500 Culex erythrothorax
TREATMENT 64-04 260 LBS. VECTOBAC
6-13-04** 400 Culex erythrothorax
*Ochlerotatus washinoi is a univoltine species, one hatching per season,
usually associated with shallow,ground pools,
**This was a very windy night, likely affecting the trap count.
A ITA W AA UJ TI
It was evident after the first initial treatments and trapping activities, that the mosquito
larvicide was not reaching the innermost areas of the shallow waters where the mosquito
larvae are found. A group of the abatement team attempted to access the lake shallows
from the shoreline by literally "stomping" a trail through the reeds to access the waters
edge. The tule growth is extremely dense, and in many areas, dead reeds lay flat in mats
up to three feet high. In many areas, the tules stretch into the lake for hundreds of feet. It
took four people about an hour just to reach the edge of the water. Once the water's edge
was reached, the group performed some trials to see how much of the granulated product
penetrated the rules when applied from above.
Product was applied by hand from the top of the tules. Several experiments were tried. In
one trial, a measured handful of product was sprinkled from above, and caught in a tray at
the water surface. In that trail only twelve granules out of 1000 reached the tray. Less
that one percent of the product reached the surface.
Due to the extreme density and depth of the tule growth, it would be extremely labor
intensive to try to apply product from the ground. Even if ground application were
physically easier, the amount and density of vegetative growth prevents the product from
reaching the surface of the water.
In consultation with numerous California Mosquito Abatement Districts and experts in
the field of mosquito control, several alternatives are recommended:
1. Aerial application of the granulated product may be able to penetrate the reeds if
followed by a subsequent fly-over"rotor-wash".
2. Aerial application of liquid product may penetrate the vegetation if followed by a
water wash.
3. Vegetation control, by thinning or removing the reeds would allow better access
for ground crews, although application would still be extremely labor intensive.
4. Removal of most of the tule vegetation would eliminate the majority of the
mosquito breeding habitat, and thereby opening up more habitat for waterfowl.
Given the lack of success in treating the lake by boat, this activity will be suspended
pending further review.
Rug 06 04 04: 04p noir anmental Health ATTACHMENT 5 P. 1
SAN LUIS OBISPO COUNTY HEALTH DEPARTMENT
ENVIRONMENTAL HEALTH SERVICES
(805) 781- 5544
FAX: (805) 781- 4211
2156 Sierra Way -P.O. Box 1489, San Luis Obispo, California 93406
Facsimile Cover Sheet
Date: August 6,2004
To: Wendy George
From: Steve Carnes Fax Number: 781-7109
Subject: Helicopter Cost Estimates for Laguna Lake Treatment
Number of pages including cover page: 4
Comments:
In our recent meeting regarding mosquito abatement efforts at Laguna Lake,we discussed how
our joint efforts have proven to be ineffective in reducing the number of emerging adult
mosquitoes. The main reasons our larvicidal attempts were unsuccessful is that the tulle masses
are too wide and the fallen tulle mats too thick to allow the treatment products to reach the water
as needed to be available for larva to feed on them.
Visiting staff from a Northern California County Mosquito Abatement District,have advised us
that application by helicopter might be effective to disperse and"prop wash" treatment products
out of the tulles and into the water.
We have obtained cost estimates from three helicopter service companies and copies of their
responses are attached for your review. A pesticide sales representative and the visiting
mosquito abatement district staff estimated that each helicopter treatment would require
approximately 2 hours of flight time over the lake. Depending on many factors, including but not
limited to weather and product applied, follow-up treatments would be needed to measure
whether or not these abatement efforts were accomplishing a reduction-in mosquito breeding.
Follow-up treatments would need to occur every 7 to 10 days.
If you wish to pursue helicopter applications at Laguna Lake,please let us know. We believe
that three or four applications would be required in order to verify results. At this time,the
Mosquito Abatement Program can commit to supplying sufficient treatment product for up to
four treatments.
O:1Common�DOC:UMENTWWve'%FORMSTFAXTEMP.DOC 6-Auo-04
A l I h Clef MST ')
Aug 06 04 04: 04p Environmental Health 18051781 -4211 P. .
FROM SINTQJ HELICOPTERS PHONE NO. : [305'238 3370 Jul. 30 2004 09:02RM P2
P.O.Box 337
Sinton Helicopters Paso Robbs.CA 93447
(805)238.4037
(805)238-3370 Fax
July 30, 2004
To Steve Carnes.
We have received your request of information on availability and costs
to complete the mosquito control job on Laguna Lake.We, are
available and would like to be placed on your contract resource list.
We charge $9400 per flight hour, including time of depaature in Paso
Robles, to the job site and the time to return back to Paso Robles-
Our business license #: 03967-00000
Sinton Helicopters
Jack Sinton, President
Rug 06 04 04: 05p nvironmental Health ,(8051781 -4211 p. 3
Aug . ?. 2004 12 : 104 - Nu.4900 P. 2
{
sit ao�Q JIN HELiao TE R5
1407 SOUTH LEXINGTON • DELANO,CA 93215
961/72:1888 • FAXe81f?r>6401
August 2, 2004
San Luis Obispo.County Health Department
Environmental Hceiith Services
2156 Sierra Way
P.O_Box 1489
San Luis Obispo, CA 93406
A(In Steve Carnes
The following iS OUT proposal that you have requested:
Helicopter Application 1,1 00-00111r.
Loader Truck Use $550.00/Day
Loader and Fuel Truck Mileage $1.25/Mile
Food and lodging expenses while servicing remote reservoirs.. Receipts shall be provided
with invoice- Not to exceed $200.00 per person,per day.
Our pesticide applicator certificate number is 0 15 57.Please do not hesitate to contact us,
should you have further questions, or require any additional information.
J, hson.
caner '
�11T11U-�Mli S
Aug 06 04 04: 05p , Environmental Health � [80577 1 -421 ,
R-
08/06/2904 16:37 •422-1118 R&B WLICL .RS PAGE 02/02
r I I
P.O. BOX 4087•SALINAS, CALIFORNIA 93912
TELEPHONE(831)422-6996
FAX(631)422-1118
August 6,2004
Mr. Steve Carnes
Environmental Health Services
San Luis Obispo County Health Department
2156 Sierra Way
San Luis Obispo,CA 93406
Dear Steve:
Per our telephone conversation today, here are the rates that we had talked about:
All helicopter ferry flight time C•r P A V EL.) $1500/hr
Work to be performed for all external bucket applications,
including VectoBac, VectoLex,& Altosid $3000/hr
Thank you,
Thor Luther
General Manager/Chief Pilot
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Todd Beights - Benefit Assx ment Formation Steps ATTACHMENT 13
From: <scames@co.slo.ca.us>
To: <tbeights@sloaLy.org>
Date: 8/17/2004 8:48 AM
Subject Benefit Assessment Formation Steps
Todd,
A consultant has advised us that these are the steps to be followed in
pursuing a benefit assessment:
Authorization from the BOS to conduct benefit assessment
ballot measure
Hire a consultant
Request support from the cities for the benefit assessment
ballot measure -
Complete Engineering Assessment Report
Return to SOS for approval of Engineering Assessment Report
and authorization of the mail-out ballot
Mail-out ballot
Determination of Outcome of the ballot
If I can be of further assistance, please let me know. . .Steve
file://C:\Documents%20and%20Setdngs\slouser\Local%20Setdngs\Temp\GW}0000I.HTM 8/17/2004
1—.2-7
CA Codes (hsc:2010-2014) � Page 1 of 2
HEALTH AND SAFE-i'Y CODE A-,-,A w AAti�j T i 3
SECTION 2010-2014own�TloN
2010. A new district may be formed pursuant to this article.
2011. (a) A proposal to form a new district may be made by
petition. The petition shall do all of the things required by
Section 56700 of the Government Code. In addition, the petition
shall:
(1) Set forth the methods by which the district will be financed,
including, but not limited to, special taxes, special benefit
assessments, and fees.
(2) Propose a name for the district.
(3) Specify the size of the initial board of trustees and the
method of their appointment.
(b) The petitions, the proponents, and the procedures for
certifying the sufficiency of the petitions shall comply with Chapter
2 (commencing with Section 56700) of Part 3 of Division 3 of Title 5
of the Government Code. In the case of. any conflict between Chapter
2 (commencing with Section 56700) of Part 3 of Division 3 of Title 5
of the Government Code and this article, the provisions of this
article shall prevail.
(c) The petition shall be signed by not less than 25 percent of
the registered voters residing in the area to be included in the
district, as determined by the local agency formation commission.
2012. (a) Before circulating any petition, the proponents shall
publish a notice of intention that includes a written statement not
to exceed 500 words in length, setting forth the reasons for forming
the district and the methods by which the district will be financed.
The notice shall be published pursuant to Section 6061 of the
Government Code in one or more newspapers of general circulation
within the territory proposed to be included in the district. If the
territory proposed to be included in the district is located in more
than one county, publication of the notice shall be made in at least
one newspaper of general circulation in each of the counties.
(b) The following shall be signed by a representative of the
proponent, and shall be in substantially the following form:
"Notice of Intent to Circulate Petition
"Notice is hereby given of the intention to circulate a petition
proposing to form the (name of the district) . The
reasons for forming the proposed district are: The
method(s) by which the proposed district will be financed are:
"
(c) Within five days after the date of publication, the proponents
shall file with the executive officer of the local agency formation
commission of the principal county a copy of the notice together with
an affidavit made by a representative of the newspaper in which the
notice was published certifying to the fact of the publication.
(d) After the filing required pursuant to subdivision (c) , the
petition may be circulated for signatures.. p
^o?b
http://www.leginfo.ca.gov/cgi-bin/displayeode?section=hsc&group=02001-03000&.file=2010-2014 8/18/2004
CA Codes (hsc:2010-2014) Page 2 of 2
• ((1CNNtEYQ j 13
i
20.13. (a) A proposal to form a new district may also be made by the
adoption of a resolution of application by the legislative body of
any county or city that contains the territory proposed to be
included in the district. Except for the provisions regarding the
signers, signatures, and the proponents, a resolution of application
shall contain all of the matters required for inclusion in a petition
in Section 2011.
(b) Before adopting a resolution of application, the legislative
body shall hold a public hearing on the resolution. Notice of the
hearing shall be published pursuant to Section 6061 of the Government
Code in one or more newspapers of general circulation within the
county or city. At least 20 days before the hearing, the legislative
body shall give mailed notice of its hearing to the executive
officer of the local agency formation commission of the principal
county. The notice shall generally describe the proposed formation
of the district and the territory proposed to be included in the
district.
(c) At the hearing required by subdivision (b) , the legislative
body shall give any person an opportunity to present his or her views
on the resolution.
(d) The clerk of the legislative body shall file a certified copy
of the resolution of application with the executive officer of the
local agency formation commission of the principal county.
2014. (a) Once the proponents have filed a sufficient petition or a
legislative body has filed a resolution of application, the local
agency formation commission shall proceed pursuant to Part 3
(commencing with Section 56650) of Division 3 of Title 5 of the
Government Code..
(b) If the local agency formation commission approves the proposal
for the formation of a district, then, notwithstanding Section 57007
of the Government Code, the commission shall proceed pursuant to
Part 4 (commencing with Section 57000) of Division 3 of Title 5 of
the Government Code.
(c) Notwithstanding Section 57075 of the Government Code, the
local agency formation commission shall take one of the following
actions:
(1) If a majority protest exists in accordance with Section 57078
of the Government Code, the commission shall terminate proceedings.
(2) If no majority protest exists, the commission shall either:
(A) Order the formation without an election.
(B) Order the formation subject to the approval by the voters of a
special tax or the approval by the property owners of a special
benefit assessment.
(d) If the local agency formation commission orders the formation
of a district pursuant to subparagraph (B) of paragraph (2) of
subdivision (c) , the commission shall direct the board of supervisors
to direct county officials to conduct the necessary elections on
behalf of the proposed district..
http://www.leginfo.ca.gov/cgi-bin/displaycode?section=hsc&group=02001-03000&file=2010-2014 8/18/2004
/c
City Council - West Nile Virus 31 August 20046,
X ,
Mr. Mayor and Members of the Council T- L S k rt `
Good afternoon. In preparation for this meeting I have
carefully read the Council Agenda.Report prepared by Todd
Beights.
My wife and I are here today to support your planned action. It
was only a short while ago that we read about the West Nile
occurrences in New York; two months ago California was
number four nationally in occurrence, today we are number one.
h is time for everyone to act swiftly; this disease, spread by
birds, ignores all artificial political boundaries. Thus, considering
the rapid, frightening rate of spread of the disease, working
together is a must.
We ourselves live on Laguna Lake, a favorite spot for
both birds and mosquitos; and we will accept the means
of abatement considered necessary, however we most
certainly will want advance information, through the proposed
citizen education program, want PAT# fTx&-
About fiscal matters; Your resolution #2 calls for State
and Federal funding. Sure, go ahead and pass this, it would
be nice to obtain such funds, but today's financial crises at
State and National levels suggests that such moneys are not
likely to come quickly, if at all. The City and County should
realistically plan to pay for this abatement locally through the rapid
formation of the Vector Control District, including a Benefit
Assessment provision, which measure will be put to the to the
voters for approval. Can this be done in time for the November
elections?
Finally, a specific suggestion as,to a possible savings in the
use of helicopters I have raised the question with Steve Carnes
of Environmental Health Services as to whether costs could
be reduced through the use of government rather than private
helicopters, obtaining such helicopter support from possibly the
National Guard, CDF or Highway Patrol.
Thank you
Tom & Margrethe Friedman
aolrich://389361031/
Subj: Letter to the Editor
Date: 16, August 2004, 9:08:19 AM RED FILE
From: FRITOMI6 MEETING AGENDA
To: bmorem@thetribunenews.com �e�•� 83/ L ITEM # SS1
Re West Nile Virus: Mosquito abatement is a must, and should include all public mosquito
breeding areas. This country, with other advanced nations, proudly compares itself to
under developed nations when mentioning malaria and other major public health
problems which have been conquered by the advanced countries, but not the third world,
mainly because of lack of funds.
The West Nile virus is a public health problem. When a large part of a population is
infected many can develop full blown encephalitis with resulting paralysis-devastating to
the individual and costly to the public. We must act now; are we going to eliminate this
disease, as we did malaria, or let it go unchecked. Compare the cost.
llyzin
Marg Friedman
PO Box 5036
San Luis Obispo 93403
5442247
SACRAMENTO
State's West Nile virus
cases jump 32 percent
The number of people infect-
ed with the West Nile virus m
California has jumped by 32
percent since Tuesday,state of-
ficials said Friday. Ph
There are now 249 reported COUNCIL — CDD D;R
cases in California,up from 189 GAO SIN C)
cases
on Tuesday,said Lea Brooks, ACRO FIRE CHIEF
spokeswoman for the state De ATTORNEY E PW DIR
partment of Health Services. CLERK'ORIG POLICE CHF
Mosquito activity is greatest DEPT yEADREC DIR
in August,September and early Tr�/� lY�
October—.a time when Califor- UTI L DIR
nians spend more time out-
doors,
utdoors,said Ken August,a de-
partment spokesman.
The mosquito-borne Wness
has killed six people,DHS said.
1 of 1 8/16/04 9:09 AN
County of San Luis Obispo • Pudic Health Department
1850
- Environmental Health Services
2156 Sierra Way • P.O. Box 1489
>' MEETING AGENDA San Luis Obispo, California 93406
(805) 781-5544 • FAX (805) 781-4211
DATE '31 d ITEM # 551 Gregory Thomas, M.D., M.P.H.
County Health Officer
August 27, 2004 Public Health Director
y �/ Curtis A. Batson, R.E.H.S.
%14zlyi .�— J/rK.&c -t Director
CQUUM L 17 C®o DIR
CAao Full DUR tc.Zr
ACAO FIRE CHIEF lU�
David Romero, Mayor ATTORNEY PW DIR
City of San Luis Obispo - CL5AlQORIQ POUCE CHF
990 PalmI DOT HlEAD9 REC DIR
Y-2/,6 UTIL DIR
San Luis Obispo, CA 93401 C 1HRI DIP,
Re: Mosquito Abatement @ Laguna Lake
By way of adult mosquito trapping, the San Luis Obispo County Mosquito Abatement
Program determined that Laguna Lake was a significant source of mosquitoes,
including at least one species that is capable of transmitting West Nile Virus. County
mosquito abatement technicians, using a shallow draft boat piloted by City staff made
three applications of a biological control product. Posttreatment trapping results
indicated the treatments failed to accomplish a reduction in the numbers of emerging
adult mosquitoes.
It has been determined that effective larviciding is not possible via backpack blowers as
the distance we can apply larvicide product is significantly shorter than the width of the
standing water and tules along much of the periphery of the lake. The broad bands of
tules pose an impenetrable obstacle to technicians, equipment, control product
deposition and apparently mosquito fish as well.
Environmental Health Services has investigated options for potentially effective means
of reducing mosquito breeding in Laguna Lake.
The mosquito abatement options identified include:
Draining the lake
Aquatic Plant Management
An aquatic plant specialist could be consulted as to ways to reduce
mosquito habitats and facilitate treatment by removing, periodically
thinning tulles, cutting and dredging access swaths through the plants, etc.
Dredging that created steeply sloped sides around the lake's perimeter
would also minimize mosquito breeding.
=A[2/tVa3;j1J
O9Common%DOCUMENTatove4MosquitoAaatemenHLagun
David Romero, Mayor
Page Two
August 27, 2004
Use of Helicopters to Apply Larvicides
The San Diego County Mosquito Abatement District has attained great
success with monthly larvicide applications conducted by helicopters.
Graphs depicting the dramatic reductions in numbers of emerging adult
mosquitoes are included in the City's staff report.
Additionally, there has been discussion of introducing "mosquito fish" into the lake as a
means of controlling mosquito larvae. However, it is our understanding that mosquito
fish are already present in the lake. Introduction of mosquito fish into open waters is
contrary to the terms of our program's "Best.Management Practices" and we have
encountered concern from some State Park and State Fish and Game officials that
placing mosquito fish into open waters can provide competition for native fish species.
A representative from a neighboring county mosquito abatement district indicated that
mosquito fish only penetrate about 15 feet or so into tule thickets. The tulles at Laguna
Lake are estimated to be 80-100 feet wide in some spots.
Although draining the lake is not a realistic option, it may be advantageous to study
strategic dredging to accomplish multiple objectives, e.g. tule removal/thinning,
deepening, mosquito habitat elimination, park renovation, etc. especially if the current
drier conditions continue into next year.
Available adult mosquito trapping results indicate:
2003 2004
July 9 Thousands of Culex March 20 50 Ochlerotatus washinoi
erythrothorax* April 24 500 Ochlerotatus washinoi
August 4 500 Culex erythrothorax* 2,000 Ochlerotatus washinoi
August 23 500 Culex erythrothorax* 3,000 Ochlerotatus washinoi
September 13 500 Culex erythrothorax* May 7 500 Ochlerotatus washinoi
October 27 250 Culex erythrothorax* May 16 150 Ochlerotatus washinoi
November 6 300 Culex erythrothorax* May 28 500 Culex erythrothorax*
June 13 400 Culex erythrothorax*
This species of mosquito with June 28 2,000 Culex erythrothorax
a flight range of up to two miles August 1 1500 Culex erythrothorax
is associated with West Nile
Virus transmission.
The recommendations to the City for mosquito abatement within Laguna Lake are:
Consider implementing the fullest extent of recurrent aquatic vegetation removal
and or reduction possible.
If planned dredging is performed, specify shoreline in affected areas is to be
steeply sloped to reduce emergent vegetation and mosquito egg laying habitats.
O:\Common\DOCUMEN%teve\Mosquito Abatemen9Laguna Lake Abatement Options New.doc 27-Aug-04
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David Romero, Mayor
Page Three
August 27, 2004
Treat the wide banded tules and other aquatic plant areas monthly utilizing a 2 to
1 mix of Vectolex-Vectobac until adult trapping results indicate a 90% reduction
in emerging adult mosquitoes. Vectolex and Vectobac are pelletized
formulations of naturally occurring bacteria that when ingested by mosquito
larvae disrupt the insects' digestive process, thereby preventing development
into adult mosquitoes.
Consideration should be given to initiating treatment this fall as larvae can
be expected to continue to develop into adults until temperatures drop low
enough to cause "hibernation" until spring. Fall treatment might also be
warranted to minimize human cases of West Nile Virus that may yet develop if
summer temperatures extend into October and November prolonging the active
mosquito biting season.
Include mosquito abatement best management practices in future Laguna Lake
Park renovation projects. The current project plans contain several development
features that would be contraindicated to mitigate mosquito problems,e.g.
planting willows and berries along shorelines.
Gregory Thomas, M.D., M.P.H.
Health Officer/Public Health Director
c: Wendy George
O:tOommontD000MEN tsteveNosquito Abatement"guna lake Abatement Options New.do 27-Aug-04
Page 1 of 2
SLO Citycouncil - combating West Nile virus 1En
From: Lisa Ganaja <Iganaja@yahoo.com> AUG 31 2004
To: <slocitycoundl@slocity.org> SLO CITY CLERK
Date: 8/30/2004 4:39 PM
Subject: combating West Nile virus
Dear Members of the San Luis Obispo City Council:
I am opposed to the spraying of insecticide as a means
to combat mosquitoes in San Luis Obispo.
I am very concemed about the plan to have a
helicopter spray insecticide on Laguna Lake next RED FILE
spring and the health affects it may have on those of
us who live close by. ME ING AGENDA
A recent article in the LA Times ("State takes Aim DATE*9 ITEM #Sv I
Before is Sprays for West.Nile". Sunday, August 8,
2004) quotes a spokesman for the United States EPA as
saying that no pesticide is considered 100% safe. It
is a fact that aerial spraying is less safe than
manual spraying. We all know how windy it is in the
Laguna Lake area.
Insecticdes can be harmful to people and pets if I�couNCIL TCDD DIR
swallowed or inhaled and may cause nausea, vomiting %CAC LRIN DIR
and diarrhea. Large quantities can result in nervousATTORNEY .Z 'FIRE CHIEF
system effects such as dizziness, tremors, loss of .2'P W DIR
coordination and potentially other serious long-term - CLERK ORIG ,C POLICE CHF
P Y 9' ❑*DT HEADyyREC DIR
health affects. Insecticides are also toxic to fish �1 Za LJTIL DIR
and wildlife. I% 7HR DIR
Some sort of educational outreach would be a step in
the right direction. Make sure that everyone knows
that avoiding the outdoors from dusk to dawn when
mosquitoes are most active and wearing long-sleeved
shirts and long pants are the best way to prevent
mosquito bites.
Please weigh the cost/benefit of insecticide use for
battling mosquitoes. Consider the harm that the
insecticide will have on people and wildlife verses
the number of people who actually contract the
illness. The CDC has stated that the risk of West
Nile virus is low.
Sincerely,
Lisa Ganaja
1232 Descanso Street
SLO
file://C:\Documents%20and%2OSettings\slouser\Local%2OSettings\Temp\GW}000O1.HTM 8/31/2004
Page 1 of 1
SLO Citycouncil-Mosquitos
RECEIVED
From: "Kerry, Kent or Patrick Taylor" <KKPT@slonet.org>
To: <slocitycouncil@slocity.org> AU6 31 2004
Date: 8/31/2004 7:32 AM
Subject: Mosquitos SLO CITY CLERK
Dear Mayor and Councilmembers,
From what I have read in The Tribune, I appreciate the fact that you may take steps to deal with the threat of mosquitoes emanating
from Laguna Lake. The treat to the public safety from the west rile virus is great and it is good to see that you are considering doing
something to protect the community.
I attended a Parks and Recreation Commission meeting during the Summer dealing with the Laguna Lake Park Masterplan. I learned
that one of the reasons for the mosquitoes breeding in the lake is that it needs MAINTENANCE DREDGING. I hope you will consider
adding MAINTENENCE DREDGING of Laguna Lake to your plans to protect the community.
Thank you.
Kent M.Taylor
1295 Descanso St.
San Luis Obispo, CA 93405
594-1559
RED FILE
MEETING AGENDA
DATE ITEM # S<A
'2zCu,�iu
COUiJCIL -z np DIR
ICAOC,=IN DIR
(r ACAO FIRE CHIEF
ATTORNEY �c=W DIR
CLERKJ091G 201POLICE CHF
❑ DEPT HEAD ?=C DIR
IL DIR
file:HC:\Documents%20and%2OSettings\slouser\Local%2OSettings\Temp\GW}000O1.HTM 8/31/2004
1
RECEIVED
council memomnbu aur 3 0 200
SLoQCLERK
RED
August 30, 2004 MEETING AGENDA
�ATE4 ITEM
TO: City Counci p ` —
✓COUN .n TCDD DIR
0 FIN DIR
VIA: Ken Hampian, City Administrative Officer 2 ACAO )21FIRE CHIEF
ATTORNEY OPW DIR
FROM: Mike McCluskey,Director of Public Works 2-CLERK ORiu :e'POLICE CHF
❑.J�EPPT�LA,DP 2'R=C DIR
p G UTIL DIR
SUBJECT: County Letter Re: Mosquito Abatement at Laguna Laka� —3L 5 j�HR DIR
The County Director of Public Health, Dr. Gregory Thomas, submitted a letter to the Council (a
Red File item for the meeting on August 31) summarizing their position on mosquito abatement
at Laguna Lake. The letter describes the efforts made so far this season in an attempt to reduce
the numbers of adult mosquitoes that are breeding in the lake, with the potential to carry West
Nile virus. The application of larvicide to the lake has been ineffective, partly due to the broad
bands of tulles along the perimeter of the lake as well as the dense mat of vegetation that has
formed over the years. The equipment available to the County Health Department does not allow
them to properly apply the larvicide, and they met with City staff on July 15, 2004 to discuss
other possible options.
The options discussed at that meeting included draining the lake, dredging the lake to remove the
tulles and aquatic vegetation that made application of the larvicide difficult, and the use of
helicopters to apply the larvicide where the existing equipment could not reach. Introduction of
mosquito fish into the lake was also discussed; as it appeared to be a more conservative approach
that would have made pesticide application unnecessary. City staff looked into each of the
options (with the exception of draining the lake) and has provided a more detailed response with
advantages and disadvantages of each in the Council Agenda Report, along with a
recommendation to Council for some additional actions.
City staff is currently working with County Health Department staff on several fronts concerning
mosquito abatement for West Nile virus. We are identifying likely locations for mosquito
breeding in the city based on the results of mosquito traps placed during the summer months. We
are putting together a GIS-based map of certain features(drainage inlets, creeks, parks, sensitive
receptors and trap locations) to help keep track of where mosquitoes are being found and what
may be the breeding locations. City staff has also researched what other agencies are doing to
keep mosquito counts down and what the potential costs are for those activities.
In his letter, Dr. Thomas makes several recommendations for the City to take action on in the
attempt to keep mosquito counts down. We agree that the most effective strategy that can be
quickly undertaken is the helicopter application of the larvicide. A program of aquatic weed
removal or dredging the lake could only be implemented after a long study and permitting, in
addition to a large capital cost, which the Council is aware of given the length of time taken with
the Laguna Lake Dredging project. The County approached the City for assistance in the
abatement effort mainly because the County is under funded and understaffed for the effort and
has no vector control district in place.
The only difference between the County letter and the recommendations in the staff report is the
timing of the helicopter application of the larvicide. The County believes that an application of
larvicide in the fall would be effective, and possibly reduces the risk of human West Nile virus
cases if higher temperatures persist into the fall. One application of larvicide could be made at a
cost of approximately $2,500, which would give the County a chance to continue trapping and
monitoring and planning for next spring. City staff can support making a larvicide application
this fall, if the County Health Official feels strongly that it would be effective and Council is
comfortable with this technique. Staff suggests that the County take the lead in providing
advance notice to residents and an explanation of the process, with assistance from the City as
needed. Funding can be made available from within existing resources for a $2,500 fall
application.
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OFFICE OF THE CITY COUNCIL
1/tits O 990 Palm Street ■ San Luis Obispo,CA 93401-3249 ■ 805/781-7119
September 1, 2004
Chairperson Harry Ovitt
Supervisor Shirley Bianchi
Supervisor Peg Pinard
Supervisor K. H. Achadjian
Supervisor Mike Ryan
County Board of Supervisors
County Government Center
San Luis Obispo, CA 93408
Dear Chairperson Ovitt and members of the Board of Supervisors:
On August 31,2004, our City Council held a special meeting to discuss mosquitoes, particularly in the Laguna
Lake area, and the overall West Nile Virus problem The County's Public Health Director, Dr. Gregory Thomas,
was very helpful to our staff in preparing for the meeting and in presenting the information to the Council.
Our Council approved the attached resolution, asking that the San Luis Obispo County Board of Supervisors
support the formation of a vector control district. As you know, we are one of the few counties in the State without
the protection of either a mosquito or vector control district. While you may have had good reasons for the earlier
deferral of district consideration, with the presence of West Nile Virus, we feel strongly that the time has arrived for
action.
In recent months, our respective staffs' have worked collaboratively to address the mosquito problem at Laguna
Lake due to the potential health hazards involved. Traditionally, however,public health has been the responsibility
of County government. Unfortunately, as we know too well, State takeaways and other fiscal pressures have
caused many counties to retrench, or totally withdraw,from traditional county responsibilities. Therefore, while we
recognize that the County cannot simply launch a new, major program with your already strained general fund,
your Board can make the decision to bring this issue to voters. We believe that voters,given the choice and enough
information, will support providing you with the resources needed to fulfill your public health mission as it relates
to mosquitoes and other health related pests.
Therefore,the San Luis Obispo City Council respectfully requests Board action to place a vector control district—
or at least a mosquito control program assessment measure—before the voters of the County at the earliest possible
time. Even with timely action on the part of the Board and subsequent voter approval,the City is concerned that we
are already late in addressing the West Nile problem. In the meantime, we continue to appreciate the efforts of
your staff and we will continue to work collaboratively with them with the resources now available to us..
Sincerely yours,
• ' ���
David Romero
Mayor
cc: City Council, Dr. Gregory Thomas, City Staff Distribution
RESOLUTION NO. 9602 (2004 Series)
A RESOLUTION OF THE COUNCIL OF THE CITY OF SAN LUIS OBISPO
REQUESTING THAT THE SAN LUIS OBISPO COUNTY BOARD OF SUPERVISORS
SUPPORT THE FORMATION OF A VECTOR CONTROL DISTRICT
WHEREAS, it has been found that the disease West Nile virus, a serious threat to the
health of our community, has been discovered within San Luis Obispo County; and
WHEREAS, West Nile virus has caused the deaths of at least four people with the State
of California, and infected over one hundred more; and
WHEREAS, the West Nile virus is spread to people and animals by mosquitoes infected
with the disease; and
WHEREAS, other health problems associated with mosquitoes and other pests can only
be effectively addressed in a regional fashion; and
WHEREAS, the County of San Luis Obispo is one of the only counties within the State
that currently does not have a Vector Control District in place.
NOW, THEREFORE, BE IT RESOLVED by the Council of the City of San Luis
Obispo that the formation of a Vector Control District within the County of San Luis Obispo
should have a high priority with the Board of Supervisors and should be authorized for voter
approval at the earliest possible time.
Upon motion of Council Member Settle, seconded by Council Member Ewan,
and on the following roll call vote:
AYES: Council Members Ewan, Mulholland and Settle, Vice Mayor Schwartz
and Mayor Romero
NOES: None
ABSENT: None
The foregoing resolution was adopted this 3151 day of August, 2004.
• 1
Mayor David F. Romero
ATTEST:
Audrey Ho 61r
City Clerk
R 9602
Resolution No. 9602 (2004 Series)
Page 2
APPROVED AS TO FORM:
Jo atha Lowell
City Attorney