Download the city of laguna beach monitoring plan for the heisler park asbs

THE CITY OF LAGUNA BEACH
MONITORING PLAN
FOR THE HEISLER PARK ASBS PROTECTION AND
PRESERVATION PROJECT
ASBS Grant #10-410-550
COMPLETED PLAN PREPARED BY
Will Holoman, City of Laguna Beach
Refer correspondence to:
Will Holoman, City of Laguna Beach
505 Forest Drive
Laguna Beach, CA 92651
Telephone: (949) 497-0781
E-mail: [email protected]
Approval:______________________________________________________________
Date
Project Description and Monitoring Objectives
The baseline conditions along the shoreline adjacent to Heisler Park are of elevated
bacteria levels attributable to anthropogenic sources. The source of the bacteria along the
coastline is generally attributed to drainage from adjacent developed areas.
Heisler Park is currently designed to drain directly to the ocean through its subterranean
storm drains and sheet flows on the surface.
The objective of the Phase III project is to reduce the amount of bacteria reaching the
adjacent ASBS by routing nuisance flows and flows from small storm events through
treatment control BMPs then diverting any remaining water to the sanitary sewer system.
Nuisance flows will be reduced by incorporating Smarttimers and irrigation
improvements throughout the project area. The predicted outcome of this project is the
reduction of bacteria levels in the ocean by eliminating flow from storm drain lines to the
beach during non-storm and small storm conditions.
The BMPs implemented in Phase III include site design, treatment and diversion. The
site design BMP is the regrading and recontouring of the land within the project
boundaries to direct storm flows away from the beach. The innovative site design
includes tilted pathways, contoured swales and terraces built with retaining walls to
contain sediments and push surface flows into the treatment control BMPs. Smarttimers,
water efficient sprinkler heads and drought tolerant vegetation will reduce nuisance flows
by reducing on-site water waste. The treatment control BMPs are vegetated areas where
flows will infiltrate for plant use and be filtered through vegetation to remove nutrients
and bacteria. Flows which overwhelm the capacity of the treatment control BMPs will
enter the subterranean drain system, then flow into a sump where a pump will divert the
water directly to the sanitary sewer system. Flows not diverted will be treated with catch
basin inserts. The combination of BMPs and the diversions should be adequate to handle
all flows but major rain events.
The goal of the monitoring program is to quantify the amount of bacteria and water
treated through the BMPs and diverted from the beach. Research findings will build on
monitoring data gathered through the CBI funded diversion projects upstream of the
Heisler Park project area. Combining data from ocean water monitoring, the two projects
will quantify the total amount of bacteria and flow removed from the beach outfalls.
The data will be compiled and maintained by the City of Laguna Beach until submission
to the State. The information will be shared with the SWRCB, the SDRWQCB, and upon
request to other State, federal and local agencies and organizations.
Detailed Sampling Information
The City of Laguna Beach will coordinate all monitoring activities for this project. The
Project Analyst will be responsible for data collection, but subcontractors may be utilized
to assist in collecting and analyzing data. Agreements with subcontractors will be
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administered through the City. The City will also document all monitoring and
construction activities and expenditures in quarterly progress reports throughout the
project term. CEQA documentation and all necessary permits have been secured by the
City. A Quality Assurance Project Plan (QAPP), Monitoring Plan and Project
Assessment Evaluation Plan (PAEP) will be submitted by the City and approved by the
State prior to the start of project monitoring.
Water meter, storm flow, debris mass and bacteriological data are of primary interest in
the assessment of the project with respect to stated goals. The timing of the project
dictates that the field data collection activities focus on the post-construction phase for
bacteriological, debris, irrigation flow and diversion flow monitoring as pre-construction
data has already been collected. Once the post-construction field data has been collected,
it will be compared to five prior years of pre-construction ocean bacteria and water flow
data to form a comprehensive picture of pre- and post-construction conditions. Ongoing
studies at Heisler Park will be included in the analysis and results of the post-construction
monitoring for Phase III will be used in combination with results from Phases I and II to
create a comprehensive final report.
Bacteriological and debris monitoring will take place at diversion units located along
Cliff Drive adjacent to the Park. Water samples will be taken from diversions quarterly,
as available, to quantify the bacteria levels in the runoff. The sediment and debris
pumped from the unit by city crews will be tracked to calculate mass of debris captured.
Flow and bacteria data from other monitoring projects may be utilized to enhance the
data set for this location.
Bacteriological and flow monitoring will take place in the sumps where nuisance flows
are collected for diversion. The sumps represent the culmination of all subterranean drain
lines within the project prior to discharge onto the beach and are the points at which
flows are diverted to the sewer. The flow is monitored by counting the cycles of the
pump as it is triggered to divert water to the sewer lines. The known quantity of water
pumped per cycle multiplied by the number of pumping cycles will provide the necessary
flow data. Pump cycle data will be taken monthly, as available. Quarterly
bacteriological samples will also be taken at this location, as available, and subsequently
correlated with flow data to quantify the amount of bacteria diverted away from the
ocean.
Because the benefits of infiltration and site design BMPs are difficult to assess using
typical flow and sampling techniques, and the benefits of Smarttimers and irrigation
improvements must be quantified, the water meter data for Heisler Park will allow a
comparison of water usage pre- and post-construction. Precipitation data taken during
the post-construction monitoring period will be used to evaluate the effectiveness of site
design BMPs by correlating rain events to bacteria levels and other project criteria as
appropriate.
Flow, debris, bacteria, water meter and precipitation data will be taken over a period of
one year post-construction, then analyzed in a comprehensive report with the goal of
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assessing the overall bacteria reduction realized in the receiving waters with Park
improvements as well as the benefits of individual elements of the Park design. Both a
Draft and a Final report will be submitted to the State for approval.
Pre- and post-construction water samples use the following methods to determine
bacteria levels:
Parameter
Method/range
Units
Total coliform – water matrix
SM 9222-B
CFU/100 ml
Detection
Limit*
1
Fecal coliform – water matrix
Enterococcus – water matrix
SM 9222-D
SM 9230-C
CFU/100 ml
CFU/100 ml
1
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The County of Orange monitors the bacteria levels in storm drain outlets and the ocean at
several nearby locations. Data from these ongoing monitoring efforts, as well as beach
closure data, will be analyzed for one and five years, respectively, prior to and one year
post-construction.
Pre-construction data will be collected as follows:
1-year
Sediment and debris volume from diversion
Water meter flow data
Orange County storm drain and ocean bacteria data
Beach closure data
4
5year
X
X
X
As
available
X
Post-construction monitoring will begin by June 30, 2008 and the preliminary draft final
report is anticipated in August 2009. The framework for post-construction sampling is as
follows:
Monthly
Sample diversion sumps for bacteria
Record data from pump counter
Pump sediment and debris from diversions,
record volume
Water meter flow data
Orange County storm drain and ocean bacteria
data
Beach closure data
Precipitation data
X
Quarterly As Available*
X
X
X
X
X
X
X
X
*Samples cannot be taken when sumps are dry, some data may have inconsistent sampling frequencies
Geographical Information
Heisler Park is located along the Pacific Ocean shoreline immediately northwest of Main
Beach in Laguna Beach. The coordinates for the project site are approximately:
33d32’38”N, 117d47’32”W.
Monitoring sites are located as follows:
Site ID
CDS-2
CDS-3
CDS-4
Site Name
Myrtle CDS
Jasmine CDS
Aster/Gazebo CDS
D-1*
Central Diversion
D-2*
South Diversion
OLB00
OLB05
HEISLRUP
HEISLRDN
4636*
4647*
10066*
8125*
Main Beach
Heisler Park North
Heisler Upcoast
Heisler Downcoast
Heisler Water Meter
Heisler Water Meter
Heisler Water Meter
Heisler Water Meter
Parameters
Bacteria, Debris
Bacteria, Debris
Bacteria, Debris
Flow, Bacteria,
Debris
Flow, Bacteria,
Debris
Bacteria
Bacteria
Bacteria
Bacteria
Flow
Flow
Flow
Flow
*Locations approximate, TBD upon project completion
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Latitude
33d32’39.9”N
33d32’38.5”N
33d32’35.3”N
Longitude
117d47’34.0”W
117d47’26.0”W
117d47’20.3”W
33d32’36.8”N
117d47’33.3”W
33d32’35.0”N
117d47’19.4”W
33d32’31.97”N
33d32’42.85”N
33d32’33.78”N
33d32’32.57”N
33d32’42”N
33d32’38”N
33d32’42”N
33d32’38”N
117d47’11.77”W
117d47’45.39”W
117d47’20.88”W
117d47’21.80”W
117d47’35”W
117d47’26”W
117d47’35”W
117d47’26”W
Site Location Map
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Monitoring Site Map
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Resource and Time Constraints
The Heisler Park Project is expected to produce long-term positive impacts in the
adjacent waters of the Pacific Ocean, but the data to be analyzed for the final report will
span only one year after construction. It is anticipated that the data will show a decrease
in bacteria levels at the beach and a reduction in water use for the park. The data will
also serve to estimate the volume of bacteria and quantify the mass of debris diverted
away from the ocean during the first year of BMP operation therefore demonstrating
tangible benefits of the project on Heisler Park ASBS. The results of the monitoring
analysis for this final phase of the project will be combined with results from the previous
two phases to produce a more comprehensive, longer-term study of the positive impacts
of the project on the ASBS. All relevant monitoring data from Heisler Park will be
examined to determine if it would better characterize the overall effectiveness of the
BMPs and therefore enhance the final report.
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