Grover Beach City Council
March 13, 2023

Agenda Item No. 8

CITY COUNCIL STAFF REPORT
TO: Honorable Mayor and City Council DATE: March 13, 2023 FROM: Matthew Bronson, City Manager
PREPARED BY: Greg Ray, Public Works Director/City Engineer SUBJECT: Water Supply Update and Recommended Change in City’s Water Shortage Declaration

RECOMMENDATION
Receive information on the City’s water supply and approve a recommended change in the City’s water shortage declaration from Stage 3 with a 20% water use reduction with penalties to Stage 1 with voluntary compliance only.

BACKGROUND
The purpose of this agenda item is to update the Council on the City’s current water supply conditions and recommend changing the current water shortage declaration from a Stage 3 declaration with a 20% reduction requirement to a Stage 1 declaration with voluntary compliance.

These actions are consistent with the adopted 2020 Urban Water Management Plan (UWMP) and associated Water Shortage Contingency Plan (WSCP) which correlates stages of action with observed water supply conditions (called “Triggering Conditions”) and outlines measures the Council could enact to reduce water demand. A copy of the WSCP is included as Attachment 1.

On May 10, 2021, the Council enacted a Stage 1 water shortage declaration with voluntary water conservation compliance for all customers along with mandatory water waste prohibitions in response to water supply conditions at that time. The Council took subsequent action on May 9, 2022 to enact a Stage 2 water shortage declaration with a 10% mandatory reduction requirement along with further action on September 26, 2022 enacting a Stage 3 water shortage declaration and a 20% mandatory reduction requirement along with penalties. All residential customers were assigned a bi-monthly baseline water budget based upon the amount of water used during the same bi-monthly billing period in 2020 and were required to reduce water use by 20% compared to the baseline budget. Council also enacted penalties for violation of the reduction requirements and approved staff’s recommendation to reduce watering of the Costa Bella and Mentone Basin parks to help reduce total water demand in the city.

Recommended Stage of Action
The WSCP includes five stages of action corresponding to five shortage declaration levels. The action corresponding to the lowest declaration (Stage 1) is a recommended reduction in water demand of a range from 0% to 10% mandatory reduction. Stages 2 through 5 increase the recommended reduction percentage by 10% for each stage. The appropriate declaration level is determined by considering current climate and water supply conditions. There are four conditions, called triggering conditions, which are considered in determining the appropriate water shortage declaration. Each is described on the following page along with current recorded condition:

Amendment #1
Staff Report: Water Supply Update and Stage 1 Water Shortage Declaration Page 2 March 13, 2023

1. Lopez Lake storage volume. Lopez Lake storage volume is currently at 32,500 Acre-Feet with significant rain forecast over the next week. Storage above 25,000 Acre-Feet does not indicate a shortage declaration.

2. Status of last four quarterly sentry well readings relative to the 7.5 feet elevation trigger point. The last four readings beginning with the most recent are 10.58 feet, 5.88 feet, 5.34 feet and 7.98 feet indicating some recovery of groundwater levels due to higher than average rainfall this winter. Less than 4 readings below 7.5 feet indicates a Stage 1 declaration.

3. Status of State mandated water use reductions. The State mandate has remained in place since 2010 which would indicate a Stage 2 declaration.

4. Number of years of below average rainfall of 20 inches. Rainfall this winter has reached approximately 35 inches which would not indicate a shortage declaration.

Based on these triggering conditions staff is recommending reducing the shortage declaration to Stage 1 and rescinding penalties. Staff anticipates returning to the Council this fall with another update and potential recommendation in the water shortage declaration stage. The following is a detailed analysis of demand and supply conditions that were considered in developing staff’s recommended action.

Status of City Water Supplies
The City has two principal water sources: Lopez Lake and the Santa Maria Groundwater Basin.

Under normal rainfall conditions the total amount of water legally or contractually available to the City is 2,207 acre-feet per year comprised of 800 acre-feet of Lopez water and 1,407 acre-feet of groundwater. Both sources rely on local rainfall and unfortunately the Central Coast has seen below average rainfall for the previous three years. Water levels in the lake and groundwater basin have reflected the impacts of the three-year drought but fortunately above average rainfall this winter has resulted in significant rebounding of water levels. Given the difficulty of predicting future rainfall, it is still necessary to develop two supply projections with one for normal rainfall and one for drought conditions.

Lopez Lake Supply. The chart on the following page is a simplified version of charts developed by the County that have been used to predict reservoir storage based on monthly rainfall accumulation. The chart is adjusted by staff to begin with the current storage level and depicts a three-year outlook. The decline in storage is predicted based on typical agency demand, evaporation and downstream releases into Arroyo Grande Creek. The chart shows a projection based on historical drought conditions and one for average rainfall. This provides the range of likely outcomes for the Lopez Lake storage. The line titled “Lopez Supply” shows the acre-feet of water available for delivery to Grover Beach each year assuming drought conditions.

As identified above, the City has a contract with the County for 800 acre-feet of water each year, but this amount is reduced during periods of extended drought. In 2014, the County Board of Supervisors adopted the Low Reservoir Response Plan (LRRP) to identify an adaptive management plan that reduces water deliveries in response to various reservoir storage levels.

The LRRP prescribed reduction schedule is shown in Table 1 on the following page:

Staff Report: Water Supply Update and Stage 1 Water Shortage Declaration Page 3 March 13, 2023
Under projected extended drought conditions, lake storage levels are estimated to reach 20,000 acre-feet by October 2024 resulting in enactment of the LRRP and 15,000 acre-feet by August 2025 resulting in a supply reduction to 720 acre-feet. However, due to the recent contract change that allows the City to store unused entitlement and surplus water, the City has developed sufficient water in storage to delay the reduction in supply beyond the three-year projection as shown in the chart below. If the region sees rainfall approaching average levels, these supply reductions are further delayed until at least the end of 2026.

Groundwater Supply. As required by the Santa Maria Groundwater Basin Adjudication, consultants working on behalf of the City and other Northern Cities Management Area (NCMA), agencies have completed extensive monitoring of the groundwater basin and prepared the Annual Report that is filed with the Court. The monitoring is conducted to document how the groundwater system is responding to annual rainfall and the extraction of water by urban and agricultural entities. The monitoring specifically includes the study of four wells situated in such a location as to provide early warning of impending seawater intrusion. The first quarterly monitoring report of 2023 recorded groundwater levels at 10.58 feet. The three previous quarterly monitoring reports recorded groundwater levels from just above the threshold for seawater intrusion (Deep Well Index level of 7.5 feet) to as much as 2.2 feet below the threshold. These readings show the Staff Report: Water Supply Update and Stage 1 Water Shortage Declaration Page 4 March 13, 2023
effects of drought along with the recent above-average rainfall on groundwater levels. The City has been pumping approximately 500 acre-feet of water per year from the basin for the past five years which is significantly less than the 1,407 acre-feet available during average rainfall years.

Combined with reduced pumping from other NCMA agencies, the basin has been able to recover to levels above the 7.5 foot threshold in years with sufficient rainfall. Staff estimates that even under drought conditions for each of the next three years, the City should be able to continue pumping 500 acre-feet per year.

There are a number of factors outside the City’s control that could affect these groundwater supply estimates. Substantial drought, continued over pumping in the Nipomo Mesa, potential saltwater intrusion are the most significant factors. Staff is continuing to monitor these and will provide updates to the Council should any of them change significantly.

Water Demand. In recent years, water demand in the city has been approximately 1,300 acrefeet per year. Estimated demand is expected to increase to approximately 1,400 acre-feet in the five-year planning horizon due to projected developments that have been recently proposed with several already in the entitlement process.

Supply Versus Demand. The City’s two supplies, Lopez Lake and Groundwater are anticipated to range between 1,300- and 1,220 acre-feet per year for the next three years. Supply and demand are expected to be at a balance beyond the three-year projection but could require addition measures in approximately a five-year timeframe. Possible future shortages could be addressed through additional water conservation or possibly procurement of a short-term supplemental water supply.

Water Supply Options
Water Conservation Program. Water conservation is currently the only means immediately available to address a water shortage. Grover Beach residential water customers have used an average of 72 gallons per capita per day (gpcd) in recent years though this number has varied from a high of 120 gpcd in 2013 (1,803 acre-feet total) to a low of 62 gpcd in 2019 (1,187 acrefeet total). This range in usage and overall downward trend has likely been in response to five years of water conservation actions by the City including a series of water shortage declarations, a robust public information campaign, water conservation retrofit programs, and penalties for noncompliance. Based on the City’s current population, staff estimates the City could achieve a reduction in water demand to approximately 1,060 acre-feet at 62 gpcd which is a reduction of approximately 13% from current per capita demand.

The City’s average water usage continues to be among the lowest in the state and one of the lowest among local water purveyors. The most recent Stage 3 declaration requiring a 20% reduction and imposing penalties has only been enforced with penalties for the past four months and produce a per-capita demand reduction of approximately 5%. This small reduction coupled with the large number of water budget increase requests submitted to the City could be interpreted to mean the City has reached a condition where significant further reduction will be very difficult to achieve and would likely not provide a fast enough response to an unexpected reduction in supply. For this reason and due to the uncertainty of future supplies, the City needs to continue to pursue other supply alternatives.

Central Coast Blue. As the Council is aware, the City has considered a number of possible supplemental water supply sources to protect the city against the effects of drought. Of these, recycled wastewater has been identified as the most feasible which led the City to develop a partnership with Pismo Beach and Arroyo Grande for the Central Coast Blue recycled water Staff Report: Water Supply Update and Stage 1 Water Shortage Declaration Page 5 March 13, 2023
project. The project will bring a sufficient supply of recycled water to the region from a treatment facility in Grover Beach to provide supply reliability during extended drought and minimize the risk of seawater intrusion into the groundwater supply. The participating cities approved a Joint Powers Authority agreement in 2022 and the project is expected to be operational by mid-2026 with additional groundwater supply available by late-2026.

Short-Term Supplemental Water Supply Agreement. The City has the option to negotiate an agreement for short-term supplemental water supply from another agency. Several nearby agencies and the County share water infrastructure that would allow water to be delivered to Grover Beach if needed. This could include State water, Lopez Lake water or groundwater depending on the agencies own supply needs. Based on previous Council direction, staff is continuing to pursue a short-term supply option though there is less urgency with this effort given the amount of rainfall this winter and resulting increase in near-term water supply.

FISCAL IMPACT
The recommended stage reduction will result in a minor increase in Water Enterprise Fund revenue due to likely increases in water use.

ALTERNATIVES
The Council has the following alternatives to consider:

1. Receive information on the City’s water supply and approve reducing the current shortage declaration to a Stage 1 declaration and rescinding penalties; or

2. Do not approve a reduction of the current water shortage declaration and penalties; or

3. Provide alternative direction to staff.

PUBLIC NOTIFICATION
The agenda was posted in accordance with the Brown Act.

Attachments

1. Water Shortage Contingency Plan

CITY OF

GROVER BEACH

WATER SHORTAGE

CONTINGENCY PLAN
DECEMBER 2021
Attachment 1

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City of Grover Beach
Water Shortage Contingency Plan
December 2021
City Council Members
Jeff Lee - Mayor
Karen Bright – Mayor Pro Tem
Anna Miller – Council Member
Daniel Rushing – Council Member
Robert Robert – Council Member
City Staff
Gregory A. Ray, PE – Public Works Director
Lynn Steele Pearson – Administrative Analyst

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City of Grover Beach Water Shortage Contingency Plan                                                     December 2021

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Table of Contents
CHAPTER 1 INTRODUCTION ..................................................................................................................................... 1‐1

1.1 Law................................................................................................................................................................. 1‐1

1.2 City of Grover Beach (City)............................................................................................................................. 1‐1 CHAPTER 2 Water Supply Analysis ........................................................................................................................... 2‐1

2.1 Water Supply Reliability Analysis................................................................................................................... 2‐1

2.2 Annual Water Supply and Demand Assessment Procedures ........................................................................ 2‐2

2.2.1 Assessment Methodology  ..........................................................................................................................2‐3

2.2.2 Water Supply Reliability Analysis Timeline.................................................................................................2‐3

2.3 Six Standard Water Shortage Levels.............................................................................................................. 2‐4 CHAPTER 3 Water Shortage Response Actions........................................................................................................ 3‐1

3.1 Shortage Response Actions............................................................................................................................ 3‐1

3.1.1 Demand Reduction  ....................................................................................................................................3‐1

3.1.2 Supply Augmentation  ................................................................................................................................3‐2

3.1.3 Operational Changes ..................................................................................................................................3‐2

3.1.4 Additional Mandatory Restrictions.............................................................................................................3‐2 CHAPTER 4 Emergency Response Actions................................................................................................................ 4‐1

4.1 Emergency Response Plan ............................................................................................................................. 4‐1

4.2 Seismic Risk Assessment and Mitigation Plan  ............................................................................................... 4‐2

4.2.1 Faults, Earthquakes, and Liquefaction........................................................................................................4‐3

4.2.2 Seismic Risk.................................................................................................................................................4‐8

4.2.3 Mitigation ...................................................................................................................................................4‐8 CHAPTER 5 Shortage Response Effectiveness.......................................................................................................... 5‐1

5.1 Communication Protocols.............................................................................................................................. 5‐1 CHAPTER 6 Compliance and Enforcement ............................................................................................................... 6‐1

6.1 Compliance and Enforcement........................................................................................................................ 6‐1

6.2 Legal Authorities............................................................................................................................................ 6‐2

6.3 Financial Consequences of WSCP Activation ................................................................................................. 6‐2 City of Grover Beach Water Shortage Contingency Plan                                                      December 2021

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6.4 Monitoring and Reporting ............................................................................................................................. 6‐2 CHAPTER 7 WSCP Refinement, Adoption and Submittal ......................................................................................... 7‐1

7.1 WSCP Refinement Procedures....................................................................................................................... 7‐1

7.1.1 Special Water Feature Distinction ..............................................................................................................7‐1

7.2 Plan Adoption, Submittal and Availability ..................................................................................................... 7‐1 List of Tables
Table 2‐1: Climate Change Vulnerability Screening........................................................................................................ 2‐1 Table 2‐2: Key Data Inputs.............................................................................................................................................. 2‐3 Table 2‐3: Water Shortage Contingency Plan Levels...................................................................................................... 2‐5 Table 3‐1: Demand Reduction Actions........................................................................................................................... 3‐1 Table 3‐2: Supply Augmentation and Other Actions...................................................................................................... 3‐2 Table 4‐1: Catastrophic Supply Interruption Actions ..................................................................................................... 4‐1 Table 5‐1: Stages of Water Shortage Contingency Plan – Communication Protocols.................................................... 5‐1 Table 6‐1: Excessive Water Use Penalties and Charges.................................................................................................. 6‐1 Table 7‐1: Notification to Cities and Counties................................................................................................................ 7‐1 List of Figures
Figure 2‐1: Water Supply Reliability Analysis Timeline................................................................................................... 2‐4 Figure 2‐2: Historic Lopez Reservoir Storage Levels....................................................................................................... 2‐6 Figure 2‐3: Crosswalk for the City’s 2015 Shortage Levels and the 2020 WSCP Mandated Shortage Levels ................ 2‐7 Figure 4‐1: Earthquake Fault Line Map........................................................................................................................... 4‐5 Figure 4‐2: Ground Shaking Potential Map .................................................................................................................... 4‐6 Figure 4‐3: Liquefaction Susceptibility Map ................................................................................................................... 4‐7

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Appendices
Appendix A – Relevant Water Code Sections
Appendix B – Relevant Sections of San Luis Obispo County Local Hazard Mitigation Plan October 2019 Appendix C – Notification to Cities and Counties
Appendix D – WSCP Adoption Resolution
Bibliography
The following reports, studies, and other material were reviewed during preparation of this Water Shortage Contingency Plan.
1) 2020 Urban Water Management Plans Guidebook for Urban Water Suppliers dated March 2021 and prepared by the California Department of Water Resources.
2) 2020 City of Grover Beach Urban Water Management Plan dated August 2021 and prepared by MKN & Associates.
3) San Luis Obispo County Multi‐Jurisdictional Hazard Mitigation Plan dated October 2019 and prepared by Wood Inc.

4) City of Grover Beach Multi‐Hazard Emergency Response Plan dated 2004 and prepared by Grover Beach Fire Department.

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List of Acronyms
AB ‐ Assembly Bill
AF ‐ Acre‐Foot
AWIA ‐ America’s Water Infrastructure Act
BMP ‐ Best Management Practice
CEHTP ‐ California Environmental Health Tracking Program CASGEM ‐ California Statewide Groundwater Elevation Monitoring Program CII ‐ Commercial, Industrial, Institutional, water use sectors City – City of Grover Beach
CIMIS ‐ California Irrigation Management Information System County – County of San Luis Obispo
CUWCC ‐ California Urban Water Conservation Council
CWC ‐ California Water Code
DMMs ‐ Demand Management Measures
DOF ‐ Department of Finance
DU – Dwelling Unit
DWR ‐ Department of Water Resources
eARDWP ‐ Electronic Annual Reports to the Drinking Water Program (SWRCB) EOC – Emergency Operations Center
ERP ‐ Emergency Response Plan
ETo ‐ Reference Evapotranspiration
GIS ‐ Geographic Information System
GPCD ‐ Gallons per Capita per Day
IC – Incident Commander
IRWM ‐ Integrated Regional Water Management
ITP ‐ Independent Technical Panel
LAFCO ‐ Local Agency Formation Commission
NOAA ‐ National Oceanic and Atmospheric Administration
NPDES ‐ National Pollutant Discharge Elimination System City of Grover Beach Water Shortage Contingency Plan                                                      December 2021

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PWS ‐ Public Water System
RRA ‐ Risk and Resiliency Assessment
RWQCB ‐ Regional Water Quality Control Board
SB ‐ Senate Bill
SB X7‐7 ‐ Senate Bill Seven of the Senate’s Seventh Extraordinary Session of 2009 SGMA ‐ Sustainable Groundwater Management Act
SQ FT – Square Feet
SWP ‐ State Water Project
SWRCB ‐ State Water Resources Control Board
RUWMP ‐ Regional Urban Water Management Plan
UWMP ‐ Urban Water Management Plan
WARN ‐ Water/Wastewater Agency Response Network
WDR ‐ Waste Discharge Requirement
WRR ‐ Water Recycling Requirement
WSCP ‐ Water Shortage Contingency Plan

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CHAPTER 1 INTRODUCTION

1.1 Law
This Water Shortage Contingency Plan (WSCP) for the City of Grover Beach (City) outlines a program for responding to water supply limitations. The intent of the water conservation measures and progressive restrictions on water use and method of use identified in this WSCP is to provide certainty to water users and enable the City to control water use, provide water supplies, and plan and implement water management measures in a fair and orderly manner for the benefit of the public.

In 2015, in accordance with the Governor of the State of California mandate (Executive Order B‐29‐15), the City revised declaration of a stage 2 water shortage condition and prohibitions on the wasteful use of water. The City updated and amended the WSCP in June 2021 to meet the new requirements of the 2020 UWMP update.

This WSCP describes measures to be implemented during times of declared water shortages, or declared water shortage emergencies by either the City , State or Federal government. It establishes six stages of drought response actions to be implemented in times of shortage, with increasing restrictions on water use in response to decreasing available supplies.

1.2 City of Grover Beach
The City of Grover Beach (City) is an incorporated city of 13,214 residents located in southern San Luis Obispo County with the neighboring communities of City of Pismo Beach to the north, the City of Arroyo Grande to the east, and the communities of Oceano and Halcyon to the south. The City currently incorporates 2.3 square miles of land with primarily residential and commercial land uses. City topography varies from sea level to greater than 200 feet above mean sea level. The 2020 population of the City was 13,214 based on data from the Department of Finance (DOF). Population projections were based on the San Luis Obispo Council of Governments’ (SLOCOG) draft 2050 Regional Growth Forecast for San Luis Obispo County Population, Housing, and Employment Projections. All 5,278 connections to the City’s water system are metered.

The City has a variety of water sources including groundwater and imported surface water. The City extracts groundwater from the Santa Maria Valley Groundwater Basin. The City’s current allocation under the basin’s Division of Safe Yield is 1,407 AF. Additionally, the City receivesimported treated surface water from the Lopez Water Treatment Plant. The City’s current contract entitlement is 800 AF.

Relevant sections of the water code as related to the WSCP are included in Appendix A.

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CHAPTER 2 WATER SUPPLY ANALYSIS

2.1 Water Supply Reliability Analysis
The City has never sought additional water sources to meet demands in the past 5 years, regardless of regional hydrology. Therefore, there is no basis in the hydrologic record for reducing supply reliability based upon single and/or multiple dry year conditions when imported water supply is available in addition to historical groundwater production.

Given historical pumping volumes, the level of pumping has reached a state of stability in the groundwater basin and there would be some uncertainty in pumping volumes over 500 AFY.

To supplement this statement, the City developed Table 2‐1, which involved a preliminary climate change vulnerability screening (including impacts from extreme heat, water quality, sea level rise, flooding, and wildfire) for its water supplies.

Table 2‐1: Climate Change Vulnerability Screening
Assessment Imported Water
– Lopez
Groundwater –
Santa Maria
Valley
Groundwater
Basin
Level of Risk Level of Risk
I. Water Supply and Demand
Are the water supply diversions sensitive to climate
change? 2 2
Is the water supply source affected by urban or
agricultural water demand that might be climate
sensitive?
2 2
Is groundwater a major supply source? Not applicable 3
Does the water supply source rely on or could it be
affected by snowmelt? Not applicable Not applicable
Does the water supply source come from or could it
be affected by coastal aquifers? Has saltwater
intrusion been a problem in the past?
Not applicable 2
Does the water supply source rely on or could it be
affected by changes in stored water supplies? 3 2
II. Extreme Heat
Could extreme heat impact operations of the water
supply project or diversions? Not applicable Not applicable Does the supply source rely on equipment or
infrastructure that could be impacted by extreme or
prolonged heat?
Not applicable Not applicable
III. Water Quality
Could water quality issues, such as low dissolved
oxygen, algal blooms, disinfectant biproducts affect
the water supply source?
1 3
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Table 2‐1: Climate Change Vulnerability Screening
Assessment Imported Water
– Lopez
Groundwater –
Santa Maria
Valley
Groundwater
Basin
Level of Risk Level of Risk
Could reduction in assimilative capacity of a
receiving water body affect the water supply
source?
1 3
Could the water supply source be affected by water
quality shifts during rainfall/runoff events? 1 1
IV. Sea Level Rise
Is any of the water supply source infrastructure
located in area that could be exposed to rising
tides?
Not applicable Not applicable
Could coastal erosion affect the water supply
source? Not applicable Not applicable
Is the water supply source dependent on coastal
structures, such as levees or breakwaters, for
protection from flooding?
Not applicable Not applicable
V. Flooding
Is the water supply or any of its associated
infrastructure located within the 200‐year
floodplain? Does the water supply source rely on
flood protection infrastructure such as levees or
dams?
Not applicable  Not applicable
VI. Wildfire
Is the water supply source located in an area that is
expected to experience an increase in wildfire
activity or severity? Would a wildfire result in
damage to the water supply source infrastructure or
interruption of its ability to perform as designed?
Could the water supply source be affected by an
increase in wildfire activity or severity in an
upstream watershed or other adjacent area?
1 Not applicable
Notes: Level of Risk: 1 ‐ low, 3‐medium, 5‐high

2.2 Annual Water Supply and Demand Assessment Procedures In accordance with CWC 10632, the City will conduct an annual water supply and demand assessment, or annual assessment, and submit to the State by July 1st of each year.

The City will determine if a shortage in supply exists and declare the appropriate water shortage level based on the findings. The City will draft and prepare a written report that discusses the results of the annual water supply and demand assessment, what water shortage level and shortage response actions are to be implemented and issue the appropriate communication to customers and local governments. A copy of the annual report will be submitted to the City Council members ahead of the meeting for review. The City Council will listen to the findings and recommendations City of Grover Beach Water Shortage Contingency Plan                                                      December 2021

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outlined in the report and vote to approve and implement the actions described in the annual report at a May Council meeting to allow sufficient time to submit the approved report to the State before the July 1st deadline.

The Water Shortage Contingency Plan team will consist of the City Manager and Public Works Director. The team will draft and prepare the annual water supply reliability analysis report. The report will use the key data inputs and methodology described in Table 2‐2 to determine the unconstrained demand, infrastructure capabilities, available water supply and reliability for the current year and one dry year.

Table 2‐2: Key Data Inputs
Key Input:   Data:   Description:

Previous year
Customer
Demand and
Available Supply
Public Water System
Statistics Sheet (DRW
sheet)
The water statistics sheet is prepared by the City‘s Public Works Director in January for the previous year. The statistics sheet will be used to calculate water supply by source and show unconstrained water demand.

Projected Water
Supply
Well Production
History Worksheet
This worksheet is prepared by the City‘s Public Works Director and is updated each year. This worksheet provides the monthly production totals for each well. This will be used to help determine water supply reliability.

Infrastructure
Considerations
Annual Project List and
Schedule
This list will be prepared by the City’s Public Works Director and describes all the planned City projects for the year. The annual project list will be used to assess infrastructure capabilities and any potential constraints to the water system.

2.2.1 Assessment Methodology
The City will enact water shortage response actions when yearly “Blended Average Rainfall Amount” falls substantially below “Benchmark” for a given time. “Blended Average Rainfall Amount” is the average of “yearly” measured rainfall at the two official locations and “Benchmark” is the blended average of 20 inches of rainfall during a rainfall season. A dry year will be defined as a year where the rainfall condition is 65% of “Benchmark” rainfall or a quarterly “Monitoring Report” raises the concern of potential sea water intrusion and corresponds to a stage 1 water shortage level in Table 2‐3. The City will take the following steps to evaluate the water supply and demand:

1. Evaluate Water Supply: The Public Works Director monitors water supply and availability at least on a seasonal basis. Lopez Reservoir volume will be evaluated, as well as groundwater production data.

2. Calculate Unconstrained Customer Demand: Using the Public Water System Statistics Sheet calculate the total water delivered the previous year.

3. Planned Water Use for Current Year Considering Dry Year: Compare the available water supply and the customer demand and determine if there is an expected water shortage.

4. Compare supply and demand and decide on level of water supply reliability for current year and one dry year. Then, declare a water shortage level and issue relevant communication, if necessary.

2.2.2 Water Supply Reliability Analysis Timeline
The City will start to evaluate the water supply availability in January and will submit the report to Council in June of each year to allow sufficient time to submit the approved report to the State before the July 1st deadline. Figure 2‐1 shows the suggested timeline for completing the water supply reliability analysis.

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Figure 2‐1: Water Supply Reliability Analysis Timeline

2.3 Six Standard Water Shortage Levels
This WSCP identifies water conservation measures and progressive restrictions on water use to provide certainty to water users and to enable the City to control water use, provide water supplies, and plan and implement water management measures in a fair and orderly manner for the benefit of the public in accordance with CWC §10632(a)(3).

This WSCP establishessix (6)stages of drought response actionsto be implemented in times ofshortage, with increasing restrictions on water use in response to decreasing supplies. This WSCP includes both voluntary and mandatory water use reductions depending on the causes, severity, and anticipated duration of the water supply shortage. Water use reduction stages may be triggered by a shortage or contamination in one water source or a combination of sources or City Council
 Finalize assessment based on surface water
delivery allocations and groundwater
conditions
 Present final report and recommendations to
City Council
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during times that a shortage is declared by the City, State, or Federal government. The City’s potable water sources are groundwater and imported surface water. Because shortages overlap stages, triggers could result in implementation of the more restrictive stage. Specific criteria for triggering the City’s water use reduction stages are shown in Table 2‐3.

Table 2‐3: Water Shortage Contingency Plan Levels
Reduction
Level
Percent
Reduction
Range
Shortage Response Actions
1 Up to 10%
Voluntary compliance; 1 or more triggering conditions would enact shortage level:
‐ Lopez Reservoir <25,000 AF
‐ Quarterly sentry well level reading below the deep well index ‐ Below average rainfall for 1 year
2 Up to 20%
Mandatory compliance; 1 or more triggering conditions would enact shortage level:
‐ Lopez Reservoir <20,000 AF
‐ 4 quarterly sentry well level reading below the deep well index ‐ State mandated water use restrictions
‐ Below average rainfall for 2 year
3 Up to 30%
Mandatory compliance; 1 or more triggering conditions would enact shortage level:
‐ Lopez Reservoir <15,000 AF
‐ 4 quarterly sentry well level reading below the deep well index ‐ State mandated water use restrictions
‐Below average rainfall for 3 year
4 Up to 40%
Mandatory compliance; 1 or more triggering conditions would enact shortage level:
‐ Lopez Reservoir <10,000 AF
‐ 5 quarterly sentry well level reading below the deep well index ‐ State mandated water use restrictions
‐Below average rainfall for 4 year
5 Up to 50%
Mandatory compliance; 1 or more triggering conditions would enact shortage level:
‐ Lopez Reservoir <5,000 AF
‐ 6 quarterly sentry well level reading below the deep well index ‐ State mandated water use restrictions
‐ Below average rainfall for 4 year
6 >50%
Mandatory compliance; 1 or more triggering conditions would enact shortage level:
‐ Lopez Reservoir <4,000 AF
‐ Seawater intrusion into groundwater basin
‐ Catastrophic or emergency supply interruption
‐ Rainfall below average for 5 or more years
As identified in Table 2‐3, Lopez Reservoir storage volumes are one of the triggers of each shortage level. Figure 2‐2 demonstrates historic storage volumesin comparison to the 15,000 AF trigger level that would enact a Stage 3 shortage level.

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Figure 2‐3 provides a crosswalk that shows the City’s water shortage levels to those mandated by statute.

Figure 2‐3: Crosswalk for the City’s 2015 Shortage Levels and the 2020 WSCP Mandated Shortage Levels Stages from 2015 UWMP Crosswalk 2020 WSCP Mandated Shortage Levels Shortage
Level
Percent
Supply
Reduction
Water Supply
Condition
Shortage
Level
Percent
Supply
Reduction
Water
Supply
Condition
Mandatory
compliance
with water
savings
measures
1 0% ‐ Lopez Reservoir
<25,000 AF
1 0% to 10% Normal
Voluntary,
always in
place
2 0%‐10% ‐ Lopez Reservoir
<20,000 AF
2 10% to
20%
Slightly
Restricted
Mandatory
compliance
3 10%‐20% ‐ Lopez Reservoir
<15,000 AF
3 20% to
30%
Moderatel
y
Restricted
Mandatory
compliance
4 20%‐30% ‐ Lopez Reservoir
<10,000 AF
4 30% to
40% Restricted   Mandatory
compliance
5 30%‐40%
‐ Lopez Reservoir
<5,000 AF 5
40% to
50%
Severely
Restricted
Mandatory
compliance
6 40%‐50%
‐ Lopez Reservoir
<4,000 AF 6 50% and
above
Extremely
Restricted
Mandatory
compliance
City of Grover Beach Water Shortage Contingency Plan                                                     December 2021

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CHAPTER 3 WATER SHORTAGE RESPONSE ACTIONS

3.1 Shortage Response Actions

3.1.1 Demand Reduction
Table 3‐1 summarizes the restrictions and prohibitions on end uses during each stage of water shortage response implemented by the City in accordance with CWC §10632(a)(4)(B). The shortage response actions are aligned to the six water shortage levels with the goal of reducing the gap between supply and demand by the required amount per level.

Any violations of the adopted mandatory water conservation measures constitute a violation of Section 7202 and is subject to the remedies identified in Chapter 4, Art. 1 of this Code.

Table 3‐1: Demand Reduction Actions
Shortage
Level   Demand Reduction Actions
Estimated Extent
of Reducing the
Water Shortage
Gap
Penalty,
Charge, or
Other
Enforcement?
1 Education for water conservation methods. Low   No
1 Public outreach for voluntary reduction in water use by 15% Low   No 2   Landscape ‐ Restrict or prohibit runoff from landscape irrigation Medium   Yes 2   Other – Household water use allocation reductions   High   Yes 3 Other ‐ Prohibit use of potable water for construction and dust control
High   Yes
3 Other – Household water use allocation reductions High   Yes 3 Landscape ‐ Prohibit certain types of landscape irrigation Medium   Yes 4 Other ‐ Prohibit use of potable water for construction and dust control
Low   Yes
4 Other – Household water use allocation reductions Low   Yes 4 Landscape ‐ Prohibit certain types of landscape irrigation Medium   Yes 5 Other ‐ Prohibit use of potable water for construction and dust control
High   Yes
5 Other – Household water use allocation reductions Medium   Yes 5   Landscape ‐ Prohibit certain types of landscape irrigation High   Yes 6 Other ‐ Prohibit use of potable water for construction and dust control
High   Yes
6   Other – Household water use allocation reductions High   Yes 6 Landscape ‐ Prohibit certain types of landscape irrigation High   Yes City of Grover Beach Water Shortage Contingency Plan                                                      December 2021

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3.1.2 Supply Augmentation
Table 3‐2 summarizes the restrictions and prohibitions on end users during each stage of water shortage responses implemented by the City in accordance with CWC §10632(a)(4)(A).

Table 3‐2: Supply Augmentation and Other Actions
Shortage
Level
Supply Augmentation Methods and Other Actions by
Water Supplier
Estimated Extent of
Reducing the Water
Shortage Gap
Penalty, Charge,
or Other
Enforcement?
All Stages Expand Public Information Campaign Low   No
All Stages Notify all Customers of the Water Shortage Low No Stage 4 Investigate Emergency Water Supply Options High No 4 to 6 Begin implementation and/or Develop Agreements
with Nearby Agencies/Water Suppliers   High   No
4 to 6 Develop Media Campaign to Promote Water
Conservation (Channel 20)   High No

3.1.3 Operational Changes
In the event of an extreme water shortage, the City will implement some or all of the following operational changes in accordance with CWC §10632(a)(4)(C) and §10632.5(a):
 The City shall provide prompt notice to customer whenever the City obtains information that indicates a leak may exist within the end‐user’s exclusive control.  Evaluate maintenance procedures and alter if needed to reduce operation use of water loss.  Evaluate infrastructure repairs, and complete if possible, to reduce operation use of water loss.

3.1.4 Additional Mandatory Restrictions
The City’s customers shall comply to the mandatory water shortage response actions listed in Table 3‐1 associated with a level 3 or higher watershortage event in accordance with §10632(a)(4)(D). In the event of a watershortage emergency or severe drought, the City may enact additional mandatory restrictions:
 Provide technical information to customers on means to promote water use efficiency City of Grover Beach Water Shortage Contingency Plan                                                     December 2021

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CHAPTER 4 EMERGENCY RESPONSE ACTIONS

4.1 Emergency Response Plan
A catastrophic event may result in a complete loss of watersuppliesfor a temporary period lasting from a day to a week or more. Examples of catastrophic events include earthquakes, widespread power outage, contamination, long‐term drought, or loss of imported supplies. In the event of a sudden and catastrophic loss of water supply, such as in the case of a regional power outage or earthquake that damages City water infrastructure, the City will initially rely on water supply contained in the City’s storage reservoirs to deliver water directly to customers.  If the water supply interruption continues or is expected to continue for an extended period, the City will contact neighboring water suppliers and implement a transfer of water supply using existing system interconnections to the extent that neighboring suppliers have sufficient supplies available for transfer. These initial actions will allow the City to provide water for basic health and safety needs to City’s water customers until the magnitude and duration of the catastrophic water supply interruption is determined and local emergency response plans can be enacted. Additionally, the City will provide alerts and recommendations to water customers via social media, the City’s website and the City’s information channel (Channel 20).

In the event of a catastrophic emergency the City will immediately declare and enact an appropriate water shortage level and response actions, shown in Table 3‐1. The UWMP Act requires a catastrophic supply interruption plan. The City’s current Multi‐Hazard Emergency Response Plan was used as a basis for the catastrophic supply interruption plan.

This plan looks at the vulnerability of each source and distribution system to events such as wildfires, flooding, earthquakes, landslides, rockslides, other natural disasters, and unforeseen emergencies. The actions taken to address each catastrophe are presented in Table 4‐1 below:

Table 4‐1: Catastrophic Supply Interruption Actions
Possible Catastrophe Summary of Actions
Power Outage
 The City’s initial actions will be to determine if the outage is local to the water system or regional and then determine the estimated duration of the outage.
 If deemed necessary, and dependent on the anticipated duration of the outage, backup power generators will be connected to the City’s wells and water treatment facilities to restore operations.
 The source of the outage should be remedied as quickly as possible, however, if power cannot be returned quickly and could result in an eventual loss of supply to water customers, the City will enact secondary actions including notifying water customers of the supply interruption using the same information and procedures used for localized water losses and water main failures which include recommendations to store water and boil tap water if appropriate, use of the City’s water storage reservoirs to provide potable water directly to water customers and/or identification of a location where emergency water supplies can be obtained by customers.

Earthquake/ Fault
Rupture/ Liquefaction
 The first action in the event of an earthquake is to perform a system audit to determine the extent of damage to the City’s water infrastructure and treatment processes.
 If the earthquake results in an eventual loss of supply to water customers, the City will enact secondary actions including notifying water customers of the supply interruption using the same information and procedures used for localized water losses and water main failures which include recommendations to store water and boil tap water if appropriate, use of City of Grover Beach Water Shortage Contingency Plan                                                      December 2021

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Table 4‐1: Catastrophic Supply Interruption Actions
Possible Catastrophe Summary of Actions
the City’s water storage reservoirs to provide potable water directly to water customers and/or identification of a location where emergency water supplies can be obtained by customers.
 Within two hours of initial earthquake, the Planning Section Chief will request the Situation and Resource Unit leaders to prepare a report on the best available damage information.
 Based on the report, the command staff will evaluate information and discuss strategies for action
 For water disruptions, Public Works will coordinate Citywide survey of damage to water systems.
 If water pipes are broken, shut off the main valve which brings water into the house.
 If water is off, emergency water may be obtained from water heaters.  Mission includes identifying areas of disruption, estimating repair times, coordinating repairs and coordinating restoration of service with Operations Section at Emergency Operations Center (EOC)
Hazardous Materials Spill
 When potential hazardous emergency occurs, any person should contact 911  Person should provide location of incident, nature of problem, known information regarding hazardous material, name and call back number of reporting party
 Upon the Incident Commander’s (I.C.) confirmation, the Public  Treat all materials as hazardous until identified and confirmed  Stay uphill and up‐wind of material and adjusting as necessary.  Establish Exclusion Zone and Hazard Reduction Zone
 Establish site for Command Post in the Support Zone at safest edge of Hazard Reduction Zone
 Establish communications and liaison with other first responding agencies  Insure that staging areas and a secure perimeter isolating the zones are established
 Insure compliance with standing hazardous material safety orders by all emergency personnel
 Identify true nature of hazardous material safety, using Attachment II. G, “Hazardous Material Situation Report”
 Assess immediate rescue, medical, fire suppression, temporary containment and evacuation needs within current resource and safety capabilities.  Upon confirmation that material is hazardous, contact CHP dispatcher to make mandatory notifications
 Request additional resources that may be needed such as: additional city units, County Hazardous Materials Team, Chemist, mutual aid units, etc.

4.2 Seismic Risk Assessment and Mitigation Plan
The City’s water service area covers approximately 2.3 square miles. The water system is comprised of approximately 48 miles of pipeline, three storage reservoirs, one pumping station, and 5,278 metered connections. The City’s well system consists of four wells and chlorination facilities. The City topography varies from sea level to greater than 200 feet above mean sea level.

City of Grover Beach Water Shortage Contingency Plan                                                      December 2021

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The County of San Luis Obispo developed a Multi‐Jurisdictional Hazard Mitigation Plan (Hazard Plan), which evaluated seismic risk within the City’s service area. The following sections provide a summary of the general findings from the Hazard Plan with respect to potential impacts from earthquakes, faults, and liquefaction within the City’s service area.

4.2.1 Faults, Earthquakes, and Liquefaction
Per the Hazard Plan, the following provides a description of major faults within the County of San Luis Obispo:

The California Geological Survey (CGS) is charged with recording and mapping faults throughout California. The Alquist‐Priolo Earthquake Fault Zoning (AP) Act was passed into law following the destructive February 9, 1971

6.6 San Fernando earthquake. The AP Act provides a mechanism for reducing losses from surface fault rupture on a statewide basis. The intent of the AP Act isto insure public safety by prohibiting the siting of moststructures for human occupancy on or near active faults that constitute a potential hazard to structures from surface faulting or fault creep. Fault zoning is continually updated and reviewed by CGS and it is likely that other faults in addition to those currently listed by CGS will be added to the list in the future. The primary active faults identified by the AP Act in the County include the San Andreas, San Simeon‐Hosgri, and Los Osos faults.

San Andreas Fault: The San Andreas is a historically active fault thought to be capable of an earthquake up to and above the 8.0 magnitude range and generally runs along the eastern county border. It enters the County near the Cholame area, passes through the Carrizo Plain, and exits the county near Maricopa. As it passes through the County, three relatively distinct portions of the fault have separate potentials for causing a damaging earthquake. The portion of the fault that runs from Monterey County into San Luis Obispo County to an area near Cholame has commonly been known as the Parkfield segment of the San Andreas fault system.

That portion of the fault system is the one that has an approximate 5.6 – 6.0 magnitude earthquake from time to time. A segment of the system that runs from approximately the Cholame area to about the northern edge of the Carrizo Plain area has been commonly known as the Cholame segment. The portion running from the northern Carrizo Plain area and out of the County into Kern County has been commonly known as the Carrizo segment.

It is believed that in 1857 a large (possible 7.8 or larger) earthquake occurred on the San Andreas fault that possibly originated in the Parkfield area and stretched along the fault to the area near San Bernardino. This is perhaps an illustration of the potential for the San Andreas to cause a very powerful earthquake and the need to be prepared.

A major earthquake along any section of the San Andreas Fault could result in serious damage within San Luis Obispo County. An earthquake of 8.0 or greater magnitude would result in severe ground motion and could cause damage throughout the County.

With respect to the City, the only mapped fault is the potentially active Wilmar Avenue fault described below based on the Hazard Plan:

The Wilmar Avenue fault is exposed in the sea cliff near Pismo Beach and the buried trace of the fault is inferred to strike northwest‐southeast generally along a portion of the northern city limits for Grover Beach. The Wilmar Avenue fault is considered potentially active and presents a moderate fault rupture hazard to the City. Further studies to evaluate the activity of the fault are warranted, prior to placing structures near the mapped fault traces.

In addition, the Hazard Plan also provides a description of liquefaction susceptibility specifically within the City:

The areas of Grover Beach that have a high potential to be underlain by potentially liquefiable sediments are those areas underlain by beach and young alluvium. High ground water levels can be expected near the Pacific Ocean and adjacent to Meadow Creek. Site specific studies are needed to evaluate if a geologic unit actually contains potentially liquefiable materials, and if they require mitigation for development.

City of Grover Beach Water Shortage Contingency Plan                                                      December 2021

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Figure 4‐1 provides an overview of the primary active earthquake fault lines described, Figure 4‐2 provides an overview of ground shaking potential across the County, and Figure 4‐3 provides an overview of liquefaction susceptibility.

Relevant sections of the Hazard Plan are included as Appendix B.

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4.2.2 Seismic Risk
Portions of the City are underlain by layers of unconsolidated sand and young alluvium which have a high potential to become liquefied during ground shaking events. The HMP identified 23 of the City’s facilities to be critical facilities. 12 critical facilitiesfall within Liquefaction Risk Areas. Overall, residential properties are at the greatest risk of liquefaction.

4.2.3 Mitigation
In the event of a system disruption to existing water supplies from an earthquake, fault rupture, or liquefaction response actions are described in City’s emergency response plan included in Appendix B.

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CHAPTER 5 SHORTAGE RESPONSE EFFECTIVENESS
All watershortage response actions are intended to reduce the water demand below the available watersupply, during a water shortage event. To ensure that all water response actions are effective in reducing the demand to the level necessary, the City will routinely monitor water production levels monthly. If the shortage response actions are not effective in reducing water consumption to the required level, the City will refine and update the water shortage response actions until effective.

5.1 Communication Protocols
The City will inform the public, and the necessary local, regional, and state government entities regarding any current or predicted water shortages based on the results of the Annual Water Supply and Demand Assessment in accordance with CWC §10632(a)(5). The City will also notify all necessary entities of any shortage response actions mandated in response to the Annual Assessment.

In the event of a watershortage due to an emergency the City will follow emergency communication protocols outlined in the Emergency Response Plan as described by Section 4.1.

Table 5‐1: Stages of Water Shortage Contingency Plan – Communication Protocols Shortage
Level Communication Protocol and Procedure   Recipient to be notified 1 General conservation measures and resources will be distributed through a media campaign to promote water conservation (incl.

Channel 20) and expand conservation programs such as low‐flow toilet rebates.

Public
2 Bill stuffers will be distributed to all customers that inform of the Stage 2 status and mandatory water shortage response actions. The Stage 2 water shortage response actions will be included in the newsletter.

Public
3 Bill stuffers will be distributed to all customers that inform of the Stage 3 status and mandatory water shortage response actions. The Stage 3 water shortage response actions will be included in the newsletter.

Public and all government
entities
4 Bill stuffers will be distributed to all customers that inform of the Stage 4 status and mandatory water shortage response actions. The Stage 4 water shortage response actions will be included in the newsletter.

Public and all government
entities
5 Bill stuffers will be distributed to all customers that inform of the Stage 5 status and mandatory water shortage response actions. The Stage 5 water shortage response actions will be included in the newsletter.

Public and all government
entities
6 Bill stuffers will be distributed to all customers that inform of the Stage 6 status and mandatory water shortage response actions. The Stage 6 water shortage response actions will be included in the newsletter.

Public and all government
entities

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City of Grover Beach Water Shortage Contingency Plan                                                     December 2021

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CHAPTER 6 COMPLIANCE AND ENFORCEMENT

6.1 Compliance and Enforcement
The following compliance and enforcement actions to be taken by the City under a declared water shortage condition were developed in accordance with CWC §10632(a)(6).

The WSCP imposes penalties at various shortage stages including house call warnings and disconnection. Any fines or penalties under the WSCP are subject to the provisions of the City’s Mandatory Water Conservation Ordinance No. 21‐

02.  Table 6‐1 summarizes the compliance measures that the City may implement during a declared water shortage.

The City Council has determined that the surcharges listed below reasonably compensate the City and its customers for all loss of water and other damages incurred and as will foster water conservation withing the service area. The City will implement the following penalties and charges for excessive water use within its service areas:

Table 6‐1: Excessive Water Use Penalties and Charges
Shortage
Level Violation Notices and Surcharges
2‐6 1st Imposition of increasingly significant penalties so as to create a meaningful incentive to reduce water use.
2‐6 2nd
Any person who knowingly and willfully violates the provisions in the City’s Municipal code is will be charged with an infraction in accordance with subsection 1204.   An infraction under the provisions of the Code shall be punishable by (1) a fine not exceeding one hundred dollars ($100.00) for a first violation; (2) a fine not exceeding two hundred dollars ($200.00) for a second violation of the same provision within one year of the date of the first violation; (3) a fine not exceeding five hundred dollars ($500.00) for a third  or subsequent violation of the same provision within one year of the date of the first violation.

It should be noted that for the purposes of the UWMP, a first violation will receive a warning and a second violation will be treated as the first violation subject to penalty.
4‐6 3rd
A third orsubsequent violation of the same provision within one year of the date of the first violation may be charged as a misdemeanor and may result in the installation of a flow restriction device or disconnection of the customer’s property from the City’s waterservice system at the customer’s cost.  In addition to any penalties, misdemeanor criminal prosecution and the installation of a water flow restrictor, during a Water Shortage Emergency the Director may disconnect a customer’s water service for willful violations of mandatory restrictions and regulations in the City’s Municipal Code. 4‐6 4th and Subsequent
A person or entity that as a result of violations of Municipal Code has a flow restrictor installed or water service disconnected is responsible for payment of charges for installing and/or removing the flow‐restricting device and for disconnecting and/or reconnecting service in accordance with the City’s fee schedule then in effect. The charge for installing and/or removing any flow restricting device must be paid before the device is removed. Nonpayment will be subject to the same remedies as nonpayment of basic water rates.

City of Grover Beach Water Shortage Contingency Plan                                                      December 2021

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6.2 Legal Authorities
The City is governed by a five (5) member City Council Members. The Mayor is directly elected for a two‐year term and the office of Council Members is a four‐year term. The City Council has the legal authority to implement and enforce any and all of the water shortage response actions of this WSCP. Additionally, the City has the legal authority to enact civil citations and penalties in accordance with the City’s Municipal Code and most recent ordinance and resolution update.

In the event of a water shortage emergency where the ordinary demands and requirements of the City’s customers cannot be satisfied without depleting the City’s water supply to the extent that there would be insufficient water for human consumption, sanitation, and fire protection the City’s Council Members shall declare a water shortage emergency and implement and enforce the corresponding water shortage response actions in accordance with CWC Division 1, §350.

If the City Council Members declare a water shortage emergency, the City shall coordinate with the County of San Luis Obispo to issue a proclamation of a local emergency in accordance with CWC §10632(a)(7)(D).

6.3 Financial Consequences of WSCP Activation
The majority of operating costs for most water agencies are fixed rather than a function of the amount of water sold.

As a result, when significant conservation programs are undertaken, it is frequently necessary to raise water rates because the revenue generated is based on lower total consumption while the revenue required to operate and maintain the water system is basically fixed. The City may choose to adopt a drought water rate structure via a Proposition 218 process for Stages 4 and higher. The City’s WSCP describes that to counteract the financial impact of conservation during a declared water shortage.

6.4 Monitoring and Reporting
The City will monitor, analyze, and report on water production and use data in accordance with CWC §10632(a)(9).

All of the City’s customer connections are metered. Meter classes include single‐family residential, multi‐family residential, mixed use, commercial, industrial, and landscape. Meters are manually read on a monthly basis.

Under all water supply conditions, potable water production figures are recorded daily by Water Treatment Operators.

Totals are reported weekly to the Director of Public Works. The Director of Public Works incorporates the information into a monthly water supply /demand report to the City Council.

During a Stage 1 or Stage 2 watershortage, the Director of Public Works comparesthe monthly production to the target monthly production to verify that the reduction goal is being met. The Director of Public Works presents monthly reports to the City Council. If reduction goals are not met, the Director of Public Works will notify the City Council so that corrective action can be taken.

During a Stage 3 water shortage or Stage 4, the procedure listed above are followed, with the addition of a bi‐monthly production report to the City Council.

During a Stage 5, 6, or an emergency event, reports will also be provided weekly to the City Council. During emergency shortages, production figures are reported to the Director of Public Works regularly or as needed.

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CHAPTER 7 WSCP REFINEMENT, ADOPTION AND SUBMITTAL

7.1 WSCP Refinement Procedures
The WSCP is intended to implement water shortage mitigation strategies that can quickly and effectively reduce water demand during a water shortage event in accordance with CWC §10632(a)(10). The water shortage response actions listed in Table 3‐2 will be routinely monitored as outlined above. If shortage response actions are not effective in meeting the required water use reduction the City Council will have the ability to amend the WSCP as deemed necessary.

7.1.1 Special Water Feature Distinction
The City specifically distinguishes between “Decorative Water Features” and all other water features. In the event of a water shortage potable water use for decorative water features such as fountains is prohibited, and only re‐circulated water can be used to operate ornamental fountains or other decorative water features.

7.2 Plan Adoption, Submittal and Availability
The Notice of the public hearing, held during the November 2021 City Council meeting at City’s office, was sent to the City of Arroyo Grande, City of Pismo Beach, Oceano Community Services District and County of San Luis Obispo on December 2021, in accordance with CWC §10632(a)(c). A copy of the letters from the City to the Cities and County are included in Appendix C of this WSCP.

Table 7‐1: Notification to Cities and Counties
City Name    60 Day Notice Notice of
Public Hearing
City of Arroyo Grande
City of Pismo Beach
County Name 60 Day Notice Notice of
Public Hearing
San Luis Obispo County
A public adoption hearing was held on December 2021 at City’s office. The public hearing provided opportunity for community input. The WCSP update was adopted by the City during the December 2021 City Council meeting by approval of Resolution 2021‐XX. A copy of the resolution can be viewed in Appendix D.

Within 30 days of adoption, the City will submit the WSCP update to the DWR for review. During the DWR review process the City will coordinate with DWR reviewers as necessary. The City will use the online submittal tool located at www.wuedata.water.ca.gov.secure/ developed by the DWR to electronically submit the WSCP update.

Within 30 days of adoption, the City willsubmit a CD of the adopted WSCP to the California State Library at the following address:

California State Library
Government Publications Section
P.O. Box 942867
Sacramento, CA 94237‐001
Attention: Coordinator, Urban Water Management Plans
Within 30 days of adoption, the City will submit an electronic copy of the adopted WSCP update to the City of Arroyo Grande, the City of Pismo Beach, Oceano Community Services District and the County of San Luis Obispo electronically in accordance with CWC Section 10632(a)(c).

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Commencing no later than December 2021, the City will have a copy of the WSCP update available for public review at the City’s office (see address below) during normal business hours and the City’s website https://www.groverbeach.org/.

City of Grover Beach
154 S 8th Street
Grover Beach, CA 93433
Phone – 805.473.4568
Appendix A‐ Relevant Water Code Sections
CHAPTER 1 INTRODUCTION
Law
CWC 10632
(a) The plan shall provide an urban water shortage contingency analysis that includes each of the following elements that are within the authority of the urban water supplier.

Law
CWC 10632(a)(2)
The procedures used in conducting an annual water supply and demand assessment that include, at a minimum, both of the following:
(A) The written decision‐making process that an urban water supplier will use each year to determine its water supply reliability.
(B) The key data inputs and assessment methodology used to evaluate the urban water supplier’s water supply reliability for the current year and one dry year, including all of the following:
(i) Current year unconstrained demand, considering weather, growth, and other influencing factors, such as policies to manage current supplies to meet demand objectives in future years, as applicable. (ii) Current year available supply, considering hydrological and regulatory conditions in the current year and one dry year. The annual supply and demand assessment may consider more than one dry year solely at the discretion of the urban water supplier.
(iii) Existing infrastructure capabilities and plausible constraints. (iv) A defined set of locally applicable evaluation criteria that are consistently relied upon for each annual water supply and demand assessment.
(v) A description and quantification of each source of water supply.

CWC 10632.1.

An urban water supplier shall conduct an annual water supply and demand assessment pursuant to subdivision (a) of Section 10632 and, on or before July 1 of each year,submit an annual water shortage assessment report to the department with information for anticipated shortage, triggered shortage response actions, compliance and enforcement actions, and communication actions consistent with the supplier’s water shortage contingency plan. An urban water supplier that relies on imported water from the State Water Project or the Bureau of Reclamation shall submit its annual water supply and demand assessment within 14 days of receiving its final allocations, or by July 1 of each year, whichever is later.

CHAPTER 2 WATER SUPPLY ANALYSIS
Law
CWC 10631 (b)
Identify and quantify, to the extent practicable, the existing and planned sources of water available to the supplier [in five‐ year increments to 20 years or as far as data is available]1 providing supporting and related information, including all of the following:
(1) A detailed discussion of anticipated supply availability under a normal water year,single dry year, and droughts lasting at least five years, as well as more frequent and severe periods of drought, as described in the drought risk assessment.

For each source of water supply, consider any information pertinent to the reliability analysis conducted pursuant to Section 10635, including changes in supply due to climate change. (2) When multiple sources of water supply are identified, a description of the management of each supply in correlation with the other identified supplies.
(3) For any planned sources of water supply, a description of the measures that are being undertaken to acquire and develop those water supplies.

CWC 10631 (h)
An urban water supplier that relies upon a wholesale agency for a source of water shall provide the wholesale agency with water use projections from that agency for that source of water in five‐year increments to 20 years or as far as data is available. The wholesale agency shall provide information to the urban water supplier for inclusion in the urban water supplier’s plan that identifies and quantifies, to the extent practicable, the existing and planned sources of water asrequired by subdivision (b), available from the wholesale agency to the urban water supplier over the same five‐year increments, and during various water‐year typesin accordance with subdivision (f). An urban watersupplier may rely upon watersupply information provided by the wholesale agency in fulfilling the plan informational requirements of subdivisions (b) and (f).

Law
CWC 10632(a)(3)
(A)  Six standard watershortage levels corresponding to progressive ranges of up to 10, 20, 30, 40, and 50 percentshortages and greater than 50 percent shortage. Urban water suppliers shall define these shortage levels based on the suppliers’ water supply conditions, including percentage reductions in water supply, changes in groundwater levels, changes in surface elevation or level of subsidence, or other changes in hydrological or other local conditions indicative of the water supply available for use. Shortage levels shall also apply to catastrophic interruption of water supplies, including, but not limited to, a regional power outage, an earthquake, and other potential emergency events. (B)  An urban water supplier with an existing water shortage contingency plan that uses different water shortage levels may comply with the requirement in subparagraph (A) by developing and including a cross‐reference relating its existing categories to the six standard water shortage levels.

CHAPTER 3 WATER SHORTAGE RESPONSE ACTIONS
Law
CWC 10632
(a)(1) Stages of action to be undertaken by the urban water supplier in response to water supply shortages, including up to a 50 percent reduction in water supply, and an outline of specific water supply conditions which are applicable to each stage.
(a)(4) Shortage response actions that align with the defined shortage levels and include, at a minimum, all of the following:
(A)  Locally appropriate supply augmentation actions.
(B)  Locally appropriate demand reduction actions to adequately respond to shortages. (C)  Locally appropriate operational changes.
(D) Additional, mandatory prohibitions against specific water use practices that are in addition to state‐mandated prohibitions and appropriate to the local conditions.
(E) For each action, an estimate of the extent to which the gap between supplies and demand will be reduced by implementation of the action.

CHAPTER 4 EMERGENCY RESPONSE ACTIONS
Law
CWC 10632.5. (a)
In addition to the requirements of paragraph (3) of subdivision (a) of Section 10632, beginning January 1, 2020, the plan shall include a seismic risk assessment and mitigation plan to assess the vulnerability of each of the various facilities of a water system and mitigate those vulnerabilities.
(b) An urban water supplier shall update the seismic risk assessment and mitigation plan when updating its urban water management plan as required by Section 10621.
(c) An urban water supplier may comply with this section by submitting, pursuant to Section 10644, a copy of the most recent adopted local hazard mitigation plan or multihazard mitigation plan under the federal Disaster Mitigation Act of 2000 (Public Law 106‐390) if the local hazard mitigation plan or multihazard mitigation plan addresses seismic risk.

CHAPTER 5 SHORTAGE RESPONSE EFFECTIVENESS
Law
CWC 10632 (a)(5)
Communication protocols and procedures to inform customers, the public, interested parties, and local, regional, and state governments, regarding, at a minimum, all of the following:
(A) Any current or predicted shortages as determined by the annual water supply and demand assessment described pursuant to Section 10632.1.
(B) Any shortage response actions triggered or anticipated to be triggered by the annual water supply and demand assessment described pursuant to Section 10632.1.

CHAPTER 6 COMPLIANCE AND ENFORCEMENT
Law
CWC 10632 (a)(7)
(A) A description of the legal authorities that empower the urban water supplier to implement and enforce its shortage response actions specified in paragraph (4) that may include, but are not limited to, statutory authorities, ordinances, resolutions, and contract provisions.
(B) A statement that an urban water supplier shall declare a water shortage emergency in accordance with Chapter 3 (commencing with Section 350) of Division 1. [see below] (C) A statement that an urban watersuppliershall coordinate with any city or county within which it provides watersupply services for the possible proclamation of a local emergency, as defined in Section 8558 of the Government Code.

CWC Division 1, Section 350
Declaration of water shortage emergency condition. The governing body of a distributor of a public water supply, whether publicly or privately owned and including a mutual water company, shall declare a water shortage emergency condition to prevail within the area served by such distributor whenever it finds and determines that the ordinary demands and requirements of water consumers cannot be satisfied without depleting the water supply of the distributor to the extent that there would be insufficient water for human consumption, sanitation, and fire protection.

Law
CWC 10632 (a)(8)
A description of the financial consequences of, and responses for, drought conditions, including, but not limited to, all of the following:
(A) A description of potential revenue reductions and expense increases associated with activated shortage response actions described in paragraph (4).
(B) A description of mitigation actions needed to address revenue reductions and expense increases associated with activated shortage response actions described in paragraph (4). (C) A description of the cost of compliance with Chapter 3.3 (commencing with Section 365) of Division 1.

Law
CWC 10632 (a)(9)
For an urban retail water supplier, monitoring and reporting requirements and procedures that ensure appropriate data is collected, tracked, and analyzed for purposes of monitoring customer compliance and to meet state reporting requirements.

Law
CWC 10632 (b)
For purposes of developing the water shortage contingency plan pursuant to subdivision (a), an urban water supplier shall analyze and define water featuresthat are artificially supplied with water, including ponds, lakes, waterfalls, and fountains, separately from swimming pools and spas, as defined in subdivision (a) of Section 115921 of the Health and Safety Code.

CHAPTER 7 WSCP REFINEMENT, ADOPTION AND SUBMITTAL
Law
CWC 10621
(e) Each urban water supplier shall update and submit its 2020 plan to the department by July 1, 2021… CWC 10644
(a)(1) An urban water supplier shall submit to the department, the California State Library, and any city or county within which the supplier provides water supplies a copy of its plan no later than 30 days after adoption. (a)(2) The plan, or amendments to the plan, submitted to the department… shall be submitted electronically and shall include any standardized forms, tables, or displays specified by the department.

CWC 10635
(c) The urban water supplier shall provide that portion of its urban water management plan prepared pursuant to this article to any city or county within which it provides water supplies no later than 60 days after the submission of its urban water management plan.

Appendix B‐ County of San Luis Obispo Local Hazard Mitigation Plan San Luis Obispo County
Multi-Jurisdictional Hazard Mitigation Plan
October 2019
wood.

Table of Contents

TABLE OF CONTENTS
Section 1 Promulgation and Adoption............................................................................................. 1-1

1.1 County of San Luis Obispo Board of Supervisors 2005 Adoption........................................ 1-1

1.2 County of San Luis Obispo Board of Supervisors 2011 Adoption........................................ 1-2

1.3 San Luis Obispo County Flood Control and Water Conservation District 2013 Adoption ................................................................................................................................................................................ 1-3

1.4 County of San Luis Obispo Board of Supervisors 2013 Adoption........................................ 1-4

1.5 County of San Luis Obispo Board of Supervisors 2019-2020 Plan Adoption Resolution ................................................................................................................................................................................ 1-4 Section 2 Executive Summary ............................................................................................................ 2-1

2.1 Plan Description ....................................................................................................................................... 2-1

2.2 Plan Purpose and Authority ................................................................................................................. 2-2 Section 3 Planning Process ................................................................................................................. 3-1

3.1 Background on Mitigation Planning in San Luis Obispo County ......................................... 3-1

3.2 What’s New in the Plan Update ......................................................................................................... 3-1

3.2.1 Changes in Jurisdictional Participation .......................................................................... 3-2

3.2.2 Plan Section Review and Analysis - 2019 Update ..................................................... 3-2

3.3 Local Government Participation ......................................................................................................... 3-5

3.4 Planning Process ...................................................................................................................................... 3-

3.4.1 Phase 1: Organize Resources ............................................................................................. 3-8

3.4.2 Phase 2: Assess Risks ........................................................................................................ 3-

3.4.3 Phase 3: Develop the Mitigation Plan ........................................................................ 3-2

3.4.4 Phase 4: Implement the Plan and Monitor Progress ............................................ 3-22 Section 4 San Luis Obispo County Profile ........................................................................................ 4-1

4.1 County History .......................................................................................................................................... 4-1

4.2 Geography .................................................................................................................................................. 4-1

4.3 Cities and Communities ........................................................................................................................ 4-3

4.4 Population and Demographics Profile ............................................................................................ 4-6

4.4.1 Social Vulnerability ............................................................................................................. 4-10

4.5 Economy ................................................................................................................................................... 4-19

4.6 Climate ...................................................................................................................................................... 4-21

4.7 Transportation Systems ...................................................................................................................... 4-22

4.8 Governing Body ..................................................................................................................................... 4-22

4.9 Land Use ................................................................................................................................................... 4-22

4.10 Development Trends ......................................................................................................................... 4-23 Section 5 Risk Assessment .................................................................................................................. 5-1

5.1 Hazard Identification and Prioritization .......................................................................................... 5-2

5.1.1 Methodology and Results ................................................................................................ 5-2

5.1.2 Disaster Declaration History ............................................................................................ 5-5

5.1.3 Climate Change Considerations Summary ............................................................. 5-10 Table of Contents

5.1.4 Overview of Hazard Identification and Risk Assessment .................................. 5-11

5.2 Assest Summary .................................................................................................................................... 5-12

5.2.1 Assets Expsoure ....................................................................................................................... 5-12

5.3 Hazard Analysis and Risk Assessment .......................................................................................... 5-32

5.3.1 Adverse Weather: General ............................................................................................... 5-32

5.3.2 Adverss Weather: Thunderstorm/Heavy Rain/Dense Fog/Freeze ................... 5-35

5.3.3 Adverse Weather: High Wind/Tornado ...................................................................... 5-54

5.3.4 Adverse Weather: Extreme Heat ................................................................................... 5-68

5.3.5 Agricultural Pest Infestation, Plant Disease, Marine Invasive Species and Tree Mortality ................................................................................................................................. 5-78

5.3.6 Biological Agents (Naturally Occurring) ..................................................................... 5-91

5.3.7 Coastal Storm/Coastal Erosion/Sea Level Rise ...................................................... 5-101

5.3.8 Dam Incidents ..................................................................................................................... 5-137

5.3.9 Drought and Water Shortage ...................................................................................... 5-152

5.3.10 Earthquakes, Faults, and Liquefaction....................................................................... 5-168

5.3.11 Flooding ................................................................................................................................ 5-213

5.3.12 Landslides and Debris Flow ........................................................................................... 5-250

5.3.13 Soil Hazards: Land Subsidence .................................................................................... 5-263

5.3.14 Tsunami and Seiche ......................................................................................................... 5-269

5.3.15 Wildfires ................................................................................................................................ 5-281

5.3.16 Hazardous Materials Incidents .................................................................................... 5-297 Section 6 Capability Assessment ....................................................................................................... 6-1

6.1 San Luis Obispo County’s Mitigation Capabilities Overview .................................................. 6-1

6.1.1 San Luis Obispo County’s Regulatory Mitigation Capabilities ............................. 6-3

6.1.2 Combining Designations .................................................................................................. 6-17

6.2 San Luis Obispo County’s Administrative and Technical Mitigation Capabilities ....... 6-18

6.2.1 Department of Planning and Building ........................................................................ 6-18

6.2.2 Office of Emergency Services ......................................................................................... 6-18

6.2.3 Environmental Health Services Division ..................................................................... 6-19

6.2.4 Public Works Department ................................................................................................ 6-19

6.2.5 Local Boards, Commissions, Committees .................................................................. 6-20

6.2.6 State and Federal Programs............................................................................................ 6-21

6.3 San Luis Obispo County’s Fiscal Mitigation Capabilities ....................................................... 6-22

6.4 Hazard Specific Mitigation Capabilities ....................................................................................... 6-23

6.4.1 Adverse Weather capabilities ......................................................................................... 6-23

6.4.2 Agricultural Pest Infestation and Plant Disease Capabilities.............................. 6-23

6.4.3 Biological Agents (Naturally Occurring) Capabilities ............................................ 6-24

6.4.4 Coastal Storm Capabilities ............................................................................................... 6-24

6.4.5 Dam Failure Capabilities ................................................................................................... 6-24

6.4.6 Drought and Subsidence Capabilities ......................................................................... 6-25

6.4.7 Earthquake Capabilities .................................................................................................... 6-26

6.4.8 Flood Capabilities ................................................................................................................ 6-27

6.4.9 Hazardous Materials Capabilities ................................................................................. 6-29

6.4.10 Landslide Risk Reduction Capabilities ........................................................................ 6-30

6.4.11 Tsunami Capabilities .......................................................................................................... 6-30 Table of Contents

6.4.12 Wildfire Capabilities ........................................................................................................... 6-31

6.4.13 Climate Change Capabilities ........................................................................................... 6-34

6.5 Opportunities for Enhancement ..................................................................................................... 6-35 Section 7 Mitigation Strategy ............................................................................................................ 7-1

7.1 Goals and Objectives .............................................................................................................................. 7-1

7.2 Identification and Analysis of Mitigation Actions ....................................................................... 7-3

7.2.1 Prioritization Process ............................................................................................................ 7-5

7.3 Mitigation Action Plan ........................................................................................................................... 7-6

7.3.1 Progress of Previous Mitigating Actions....................................................................... 7-7

7.3.2 Updated Mitigation Action Plan ...................................................................................... 7-9 Section 8 Implementation and Monitoring ..................................................................................... 8-1

8.1 Implementation ........................................................................................................................................ 8-1

8.1.1 Role of Hazard Mitigation Planning Committee in Implementation and Maintenance ............................................................................................................................ 8-2

8.1.2 Process for Incorporation into Existing Planning Mechanisms ............................ 8-2

8.2 Maintenance Monitoring and Evaluation ....................................................................................... 8-3

8.2.1 Maintenance/Monitoring Schedule ................................................................................ 8-4

8.2.2 Maintenance and Evaluation Process............................................................................. 8-4

8.2.3 Disaster Proclamation or Declaration ............................................................................ 8-5

8.3 Continued Public Involvement ........................................................................................................... 8-5 List of Jurisdictional Annexes
Annex A City of Arroyo Grande
Annex B City of Atascadero
Annex C City of Grover Beach
Annex D City of Morro Bay
Annex E City of Paso Robles
Annex F City of Pismo Beach
Annex G City of San Luis Obispo
Annex H Avila Beach CSD
Annex I Ground Squirrel Hollow CSD
Annex J Heritage Ranch CSD
Annex K Los Osos CSD
Annex L Nipomo CSD
Annex M Oceano CSD
Annex N San Miguel CSD
Annex O San Simeon CSD
Annex P Templeton CSD
Annex Q Cayucos Sanitary District
Annex R Port San Luis Harbor District
Annex S San Luis Obispo Flood Control and Water Conservation District Annex T South San Luis Obispo County Sanitation District List of Appendices
Appendix A Hazard Mitigation Planning Committee
Table of Contents
Appendix B Mitigation Categories and Alternatives
Appendix C Planning Process Documentation
Appendix D Jurisdictional Adoption Resolutions
Appendix E Critical Facilities
Appendix F Climate Change Adaptation Planning Guide Consistency Summary Appendix G References
Acknowledgements
San Luis Obispo County Board of Supervisors
County Planning & Building
County Office of Emergency Services
Consulting Team - Wood Environment and Infrastructure Solutions, Inc.

Annex C: City of Grover Beach
San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.1
Community Profile
C.1.1 Mitigation Planning History and 2019 Process
This annex was created during the development of the 2019 San Luis Obispo County Hazard Mitigation Plan update. This Jurisdictional Annex builds upon the previous version of the Multi-Jurisdictional Local Hazard Mitigation Plan for the cities of Grover Beach, Arroyo Grande as well as the Lucia Mar Unified School District and South San Luis Obispo County Sanitation District completed in December 2014 and approved by FEMA in December 2015; that previous mitigation plan was not incorporated into the City’s General Plan, as this updated mitigation plan will be. The City has used the previous mitigation plan as a basis for the Emergency Operations Plan. A review of jurisdictional priorities found no significant changes in priorities since the last update.

The City’s Local Planning Team (LPT) held responsibility for implementation and maintenance of the plan; members are noted below. The Police Chief for Grover Beach Police is responsible for updating the plan.

Table C.1 Grover Beach Hazard Mitigation Plan Revision Planning Group Department or Stakeholder Title
Police Department Chief of Police
Public Works Public Works Director / City Engineer
Community Development Community Development Director
More details on the planning process followed and how the jurisdictions, service districts and stakeholders participated can be found in Chapter 3 of the Base Plan, as well as how the public was involved during the 2019 update.

C.1.2 Geography and Climate
The City of Grover Beach is a coastal community located in the south county area of San Luis Obispo County.

Grover Beach has wide sandy beaches with coastal dunes and is a gateway to Pismo State Beach and Oceano Dunes State Vehicular Recreational Area. According to the City’s 2015 LHMP, Grover Beach has an average high temperature (July) of 70°F and low temperature of 62°F (January). The jurisdiction receives 17.1 inches of rainfall in an average year. While the average temperature is relatively temperate, summer and winter months bring unique weather patterns to the region. Figure C.1 displays a map and the location within San Luis Obispo County of the City of Grover Beach planning area.

Annex C: City of Grover Beach
San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.2
Figure C.1 The City of Grover Beach

Annex C: City of Grover Beach
San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.3
C.1.3 History
On August 1, 1887 Dwight William Grover founded the Town of Grover after purchasing the land for $22,982.20 in gold from John Michael Price, the founder of Pismo Beach. Grover promoted his town as “the place where the tide lands and the rails meet” and had a vision of a community that had a hotel and a train station near the beach. Grover and his partner George Gates laid out a street grid pattern and promoted the community as Grover City, the “grandest summer and winter seaside resort on the Pacific Coast.” Development didn’t flourish in Grover City until 1935 when Horace V. Bagwell bought 1,100 acres and advertised Grover City as the “home of the average man” with land prices affordable to the working man. People and development began to happen and by the mid-1940’s the first store opened in Grover City followed by the first post office. The Fair Oaks Fire District and the Grover City Water District were formed in 1949 and supported a boom in population throughout the 1950’s. On December 21, 1959 the people of Grover City voted to incorporate and become the City of Grover City. In 1992, the City had become more established and the residents of Grover City decided to rename the community to “Grover Beach”. By 1996 the train station Dwight William Grover dreamed of became a reality when Amtrak began rail service at a newly constructed Grover Beach Train Station.

C.1.4 Economy
Select estimates of economic characteristics for the City of Grover Beach are shown in Table C.2.

Table C.2 City of Grover Beach Economic Characteristics, 2013-2017 Characteristic City of Grover Beach
Families below Poverty Level (%) 10%
All People below Poverty Level (%) 14%
Median Family Income $65,250
Median Household Income $61,482
Per Capita Income $30,873
Population in Labor Force 6,613
Population Employed* 6,260
Unemployment 309
Source: CA Department of Finance U.S. Census Bureau American Community Survey 2013-2017 5-Year Estimates, www.census.gov/ *Excludes armed forces
Table C.3 show how the City of Grover Beach’s labor force breaks down by industry based on estimates from the 2013-2017 five-year American Community Survey.

Annex C: City of Grover Beach
San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.4
Table C.3 City of Grover Beach’s Employment by Industry, 2013-2017 Industry # Employed % Employed
Educational Services, and Health Care and Social Assistance 1,640 26% Retail Trade 572 9%
Professional, Scientific, and Mgmt., and Administrative and Waste Mgmt. Services 789 13% Manufacturing 245 4%
Arts, Entertainment, and Recreation, and Accommodation, and Food Services 786 13% Construction 520 8%
Finance and Insurance, and Real Estate and Rental and Leasing 286 5% Public Administration 251 4%
Other Services, Except Public Administration 240 4%
Wholesale Trade 234 4%
Transportation and Warehousing, and Utilities 439 7%
Agriculture, Forestry, Fishing and Hunting, and Mining 57 1% Information 192 3%
Total 6,251 100%
Source: U.S. Census Bureau American Community Survey 2013-2017 5-Year Estimates, www.census.gov/ C.1.5 Population
According to data extracted by the California Department of Finance from U.S. Census Bureau’s American Community Survey 5-Year Estimates (2013-2017), the total population for the City of Grover Beach was estimated at 13,524 persons. Select demographic and social characteristics for the City of Grover Beach from the 2013-2017 American Community Survey are shown in Table C.4.

Annex C: City of Grover Beach
San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.5
Table C.4 City of Grover Beach’s Demographic and Social Characteristics, 2013-2015 Characteristic City of Grover Beach
Gender/Age
Male 6,687
Female 6,837
Median age (years) 36
Under 5 years 1,236
Under 18 years 3,435
65 years and over 1,875
Race/Ethnicity
White 7,952
Asian 393
Black or African American 316
American Indian/Alaska Native 101
Hispanic or Latino (of any race) 4,279
Native Hawaiian and Other Pacific Islander 126
Education
% High school graduate or higher 85%
Disability Status
% of Population 5 years and over with a
disability 15%
Source: CA Department of Finance, U.S. Census Bureau American Community Survey 2013-2017 5-Year Estimates, www.census.gov/ C.1.6 Development Trends
The City’s General Plan Land Use Element (2012) recognizes that a majority of the City has been developed and future development will be concentrated on vacant properties and redevelopment of underutilized properties.

The following figures from the San Luis Obispo County Council of Governments (COG), 2050 Regional Growth Forecast for San Luis Obispo County show the projected population and housing unit growth between 2010 and 2050. According to the COG’s document the City’s population is projected to increase to over 15,000 residents by 2050.

Annex C: City of Grover Beach
San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.6
Figure C.2 City of Grover Beach Population Projections, 2010 to 2050 Source: 2050 Regional Growth Forecast for San Luis Obispo County, San Luis Obispo Council of Governments and Beacon Economics, June 2017 Figure C.3 City of Grover Beach Housing Unit Projections, 2010 to 2050 Source: 2050 Regional Growth Forecast for San Luis Obispo County, San Luis Obispo Council of Governments and Beacon Economics, June 2017 The California Department of Finance State Demographic Report released on May 1, 2019 indicated the current population of 13,533 and between January 1, 2018 and 2019 the City of Grover Beach lost 0.6 percent of its population. Statewide, California’s 2018 population growth rate (0.47%) was the slowest in the State’s history.

Hazard Identification and Summary
The Grover Beach Planning Team identified the hazards that affect the City and summarized their frequency of occurrence, spatial extent, potential magnitude, and significance specific to Grover Beach (see Table C.5). There are no hazards that are unique to Grover Beach. The overall hazard significance takes into account the geographic area, probability and magnitude as a way to identify priority hazards for mitigation purposes. This is discussed further in the Vulnerability Assessment Section.

Annex C: City of Grover Beach
San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.7
Table C.5 City of Grover Beach – Hazard Summaries
Hazard Geograph
ic Area
Probability of
Future
Occurrence
Magnitude/
Severity
(Extent)
Overall
Significance
Coastal Storm/Coastal Erosion/Sea Level Rise Limited Occasional Limited Low Dam Incidents Significant Unlikely Limited Low
Drought and Water Shortage Extensive Likely Limited High Earthquake Extensive Occasional Critical High
Flood Limited Occasional Limited Low
Tsunami and Seiche Limited Occasional Limited Low
Wildfire Limited Occasional Limited Low
Human Caused: Hazardous Materials Limited Occasional Negligible Low Geographic Area
Limited: Less than 10% of planning area
Significant: 10-50% of planning area
Extensive: 50-100% of planning area
Probability of Future Occurrences
Highly Likely: Near 100% chance of occurrence in next year or happens every year.

Likely: Between 10 and 100% chance of occurrence in next year or has a recurrence interval of 10 years or less.

Occasional: Between 1 and 10% chance of occurrence in the next year or has a recurrence interval of 11 to 100 years.

Unlikely: Less than 1% chance of occurrence in next 100 years or has a recurrence interval of greater than every 100 years.

Magnitude/Severity (Extent)
Catastrophic—More than 50 percent of property
severely damaged; shutdown of facilities for more
than 30 days; and/or multiple deaths
Critical—25-50 percent of property severely
damaged; shutdown of facilities for at least two
weeks; and/or injuries and/or illnesses result in
permanent disability
Limited—10-25 percent of property severely
damaged; shutdown of facilities for more than a
week; and/or injuries/illnesses treatable do not result in permanent disability
Negligible—Less than 10 percent of property severely
damaged, shutdown of facilities and services for less
than 24 hours; and/or injuries/illnesses treatable with first aid
Significance
Low: minimal potential impact
Medium: moderate potential impact
High: widespread potential impact

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.8
Vulnerability Assessment
The intent of this section is to assess Grover Beach’s vulnerability separate from that of the County as a whole, which has already been assessed in Section 5.3 Risk Assessment in the Base Plan. This vulnerability assessment analyzes the population, property, and other assets at risk to hazards ranked of medium or high significance that may vary from other parts of the planning area.

The information to support the hazard identification and risk assessment was based of the previous LHMP for the City. A Local Hazard Mitigation Plan Update Guide and associated worksheets was distributed to each participating municipality or special district to complete during the 2019 update process. Information collected was analyzed and summarized in order to identify and rank all the hazards that could impact anywhere within the County, as well as to rank the hazards and identify the related vulnerabilities unique to each jurisdiction.

Each participating jurisdiction was in support of the main hazard summary identified in the Base Plan (See Table

5.2). However, the hazard summary rankings for each jurisdictional annex may vary slightly due to specific hazard risk and vulnerabilities unique to that jurisdiction. Identifying these differences helps the reader to differentiate the jurisdiction’s risk and vulnerabilities from that of the overall County.

Note: The hazard “Significance” reflects overall ranking for each hazard and is based on the City of Grover Beach’s Planning Team member input from the Data Collection Guide and the risk assessment developed during the planning process (see Chapter 5 of the Base Plan), which included a more detailed qualitative analysis with best available data.

The hazard summaries in Table C.5 reflect the hazards that could potentially affect the City. The discussion of vulnerability for each of the following hazards is located in C.3.2 Estimating Potential Losses. Based on this analysis, the priority hazard (High Significance) for mitigation is earthquake. Those of Medium or High significance for the City of Grover Beach are identified below. • Drought and Water Shortage
• Earthquake
Other Hazards
Hazards assigned a significance rating of Low or which do not differ significantly from the County ranking (e.g., Low vs. High) are not addressed further in this plan and are not assessed individually for specific vulnerabilities in this section. Those hazards include agricultural hazards, biological agents, adverse weather hazards, wildfires, and landslides.

C.3.1 Assets at Risk
This section considers Grover Beach’s assets at risk, including values at risk, critical facilities and infrastructure, historic assets, economic assets, and growth and development trends.

Values at Risk
The following data on property exposure is derived from the San Luis Obispo County 2019 Parcel and Assessor data. This data should only be used as a guideline to overall values in the City as the information has some limitations. The most significant limitation is created by Proposition 13. Instead of adjusting property values annually, the values are not adjusted or assessed at fair market value until a property transfer occurs. As a result, overall value information is likely low and does not reflect current market value of properties. It is also important to note that in the event of a disaster, it is generally the value of the infrastructure or improvements to the land

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.9
that is of concern or at risk. Generally, the land itself is not a loss. Table C.6 shows the exposure of properties (e.g., the values at risk) broken down by property type for the City of Grover Beach.

Table C.6 2019 Property Exposure for the City of Grover Beach by Property Types Property Type
Parcel
Count
Improved
Value
Content
Value Total Value
Agricultural 1 $3,139 $3,139 $6,278
Commercial 242 $71,707,475 $71,707,475 $143,414,950
Government/Utilities 37 $21,533 -- $21,533
Other/Exempt/Misc. 135 $31,280,820 -- $31,280,820
Residential 3,054 $506,840,814 $253,420,407 $760,261,221 Multi-Family Residential 600 $135,833,108 $67,916,554 $203,749,662 Mobile/Manufactured Homes 39 $2,752,757 $1,376,379 $4,129,136 Residential: Other 550 $102,234,078 $51,117,039 $153,351,117 Industrial 27 $11,177,087 $16,765,631 $27,942,718
Vacant 28 $4,325,265 -- $4,325,265
Total 4,713 $866,176,076 $462,306,623 $1,328,482,699
Source: Wood Plc analysis based on ParcelQuest and San Luis Obispo County Assessor’s Office data 2019 Critical Facilities and Infrastructure
A critical facility may be defined as one that is essential in providing utility or direction either during the response to an emergency or during the recovery operation. See Section 5 of the Base Plan for more details on the definitions and categories of critical facilities.

An inventory of critical facilities in the City of Grover Beach from San Luis Obispo County GIS is provided in Table C.7 and illustrated in Figure C.4. A more detailed list of the critical facilities, their location square footage and values from the City’s 2015 HMP can be found as an attachment to this Annex.

Table C.7 City of Grover Beach’s Critical Facilities
Facility Type Counts
Multi-modal Center (Amtrak Station) 1
Community Centers (evacuation centers
including City Hall)
3 Fire Stations 1
Local Law Enforcement 1
Private Schools 1
Public Schools 3
Emergency Communications Facility 1
Sewer Lift Stations 3
Storm Basin Pump Station 1
Water Booster Pumps 1
Water Reservoirs 3
Water Wells & Treatment Facilities 4
Total 23
Source: San Luis Obispo County Planning & Building, HIFLD 2017

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.10
Transportation and Lifeline Facilities
State Route 1 and U.S. Highway 101 border the City of Grover Beach on the west and the northeast of the City limits. Route 1 serves as a two-lane arterial for the City and merges with Highway 101 north of the City. In addition to these major transportation routes adjacent to Grover Beach, the City also offers multi-modal transportation options for residents including bike lanes, bus routes and the Grover Beach Train Station.

According to the City’s 2015 LHMP the Grover Beach Train Station is listed as being vulnerable to earthquakes, flooding, wildfire and tsunami hazards. Other vulnerable City owned transportation and lifeline facilities were noted in the 2015 plan with a combined value of nearly $50 million. The complete list of vulnerable transportation and lifeline facilities can be found in an attachment to this Annex.

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.11
Figure C.4 City of Grover Beach Critical Facilities

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.12
Historic and Cultural Resources
While the City of Grover Beach has no registered state or federal historic sites, there are several assets within Grover Beach that define the community and represent the City’s history. Many of the historical sites of importance to Grover Beach have been converted into different uses but the historic buildings still stand. In honor of the City’s 50th Anniversary a self-guided tour pamphlet was created and lists the following historic sites. • Grover Beach City Hall – 154 South 8th Street
• Precision Automotive (now Grover Beach Fire Station) – 701 Rockaway Avenue • Grover City Hall/Fire Department (now Exploration Station) – 967 Ramona Avenue • Grover City Development (now Spoon Trade Restaurant) – 295 West Grand Avenue • White’s Malt Shop (now Enterprise Rental Car) – 502 West Grand Avenue • The Keen Agency (now Taco De Mexico) – 791 West Grand Avenue • Marshall – Spoo Sunset Funeral Chapel – 1239 Longbranch Avenue • Yeackel’s / Fairlane Department Store (now Ron’s Nursery)– 850 West Grand Avenue • Grover City Shoe – (now South County Sanitary) – 866 West Grand Avenue • Greg’s Restaurant (DarWish Cuisine) – 967 West Grand Avenue • Grover City Pharmacy (now Green Bargain) – 901 West Grand Avenue • First Southern Baptist Church (now Beacon Chiropractic) 902 West Grand Avenue • Grover City Feed Store (now Ben’s Computer Outlet) – 983 West Grande Avenue • Blinking Owl (now Villa Del Mar) – 110 West Grand Avenue • Pizza Fresh – 1301 West Grand Avenue;
• Mobile Station (now Nan’s Bookstore) – 1328 West Grand Avenue • Spears Residence (now Salon Dee) – 122 North 16th Street This is now Hogge Insurance Services • A&W Root Beer (now Higher Grounds) – 1754 Grande Avenue this is now Crossroads Cafe Source: City of Grover Beach Historic Self-Guided Tour http://www.grover.org/DocumentCenter/Home/View/1455 Natural Resources
Natural resources are important to include in benefit-cost analyses for future projects and may be used to leverage additional funding for projects that also contribute to community goals for protecting sensitive natural resources. The City of Grover Beach has designated areas on the coast as Coastal Open Space Zone; according to the City of Grover Beach Local Coastal Program (2014) this zone is designed to protect and preserve sensitive natural areas including but not limited to those containing significant habitat areas, rare or endangered plant and animal species, and erosion-prone lands. Awareness of natural assets and designated natural areas can lead to opportunities for meeting multiple objectives. For instance, protecting wetlands areas protects sensitive habitat as well as attenuates and stores floodwaters.

Economic Assets
Tourism and the industries that support tourists and tourism activities are one of the greatest economic assets in the City of Grover Beach. Additionally, the commercial cannabis industry has taken off and has become a critical economic asset for the City in terms of tax revenue. The City is located close to multiple destinations including Pismo State Beach, Oceano Dunes State Recreation Area, and the Guadalupe-Nipomo Dunes National Wildlife Refuge.

The HMPC reviewed the economic strengths and competitive advantages listed in the City of Grover Beach Final Economic Development Strategy (April 11, 2017), and identified the following:

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City of Grover Beach | February 2020 Annex C.13
• Grover Beach is one of the few areas within the Southern SLO County area that has undeveloped industrial land, however these properties are quickly transforming into developed industrial and commercial holdings. • Growth in commercial cannabis. The commercial cannabis industry has played a major role in the last few years in redeveloping properties, as well as new industrial construction within the undeveloped industrial zone. The City will continue to be a future “synergy” location for commercial cannabis within San Luis Obispo County with testing labs, manufacturing, warehousing, and retail sales of commercial cannabis. • Transient occupancy tax revenue recovered quickly following the Great Recession. The development of additional lodging facilities including the Grover Beach Lodge, the Northeast Grover Beach Mixed-Use Development, and 950 El Camino Real. Development of these hotels will provide Grover Beach with an opportunity to increase tourism to the community.
• Higher quality retail and food service establishments have entered the market and increased the City’s regional draw
• Grover Beach has a reputation as a business-friendly community with a local government that is fairly easy to work with, compared to other communities.

C.3.2 Estimating Potential Losses
Note: This section details vulnerability to specific hazards of high or medium significance, where quantifiable, and/or where (according to Planning Team member input) it differs from that of the overall County.

Table C.6 above shows Grover Beach’s exposure to hazards in terms of number and value of structures. San Luis Obispo County’s parcel and assessor data was used to calculate the improved value of parcels. The most vulnerable structures are those in the floodplain (especially those that have been flooded in the past), unreinforced masonry buildings, and buildings built prior to the introduction of modern-day building codes.

Impacts of past events and vulnerability to specific hazards are further discussed below. (See Section 5.1 for more detailed information about these hazards and their impacts on San Luis Obispo County as a whole.) Dam Incidents
The Lopez Dam, a high hazard earthen dam located upstream from the community, poses the greatest risk to Grover Beach if an incident was to occur. Failure of the Lopez Dam would follow the Arroyo Grande Creek in a westerly direction approximately 3,000 feet in each direction of the centerline of the creek channel. A total of 5,319 persons and 2,392 properties would be inundated in the City of Grover Beach if the Lopez Dam was to fail.

Note that the Lopez Dam inundation mapping used to arrive at this information came from the County of San Luis Obispo’s Planning & Building/GIS Departments.

A majority of properties at risk are residential (2,119 properties) and have a combined value of $539,526,282 (refer to Table C.8 below). Refer to the Critical Facilities in the Lopez Dam Inundation Area, by Type of Facility table, in the Base Plan for details on the type of various types of critical facilities at risk. A failure of the Lopez Dam would also affect Highway 101 impeding or reducing flows of goods, people and resources into and out of Grover Beach and potentially impacting the entire region. There have been no past dam incidents or failures in the jurisdiction of the City of Grover Beach. Refer to the Dam Incidents Section in Chapter 5 of the Base Plan for additional discussion on the potential impacts of dam incidents in the County.

This information was derived from the most recent dam inundation mapping, parcel, and critical facility data available to the County of San Luis Obispo. The Grover Beach planning team added the following comments related to dam failure and inundation hazards:

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San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.14
• Lopez Dam failure would result in overtopping of Arroyo Grande Creek which would cause a backwater condition in Meadow Creek, primarily along Highway 1 and the Union Pacific Railroad tracks. • There are two facilities deemed critical to the City which are at risk from this flooding: The Train Station and the Front Street Sanitary Sewer Lift Station. However, neither of these was originally included in the countywide critical facility dataset and as such were not mapped or included in tables or summary results. • Grover Beach would be surrounded by flood waters and Highway 101 would be impassible at Oak Park Boulevard if the Lopez Dam were to cause inundation downstream, which would limit ingress/egress to Highway 101 to the northwest and significantly restrict access by emergency services from outside the city.

Table C.8 Lopez Dam Inundation Estimate Losses by Property Type Property Type
Parcel
Count
Improved
Value
Content
Value Total Value Loss Estimate Population
Agricultural 1 $3,139 $3,139 $6,278 $3,139 --
Commercial 120 $24,487,269 $24,487,269 $48,974,538 $24,487,269 -- Government/Utilities 29 -- -- $0 $0 --
Other/Exempt/Misc. 84 $21,487,616 -- $21,487,616 $10,743,808 -- Residential 1,488 $234,335,647 $117,167,824 $351,503,471 $175,751,735 3,735 Multi-Family Residential 316 $74,162,097 $37,081,049 $111,243,146 $55,621,573 793 Mobile/Manufactured Homes 2 $391,213 $195,607 $586,820 $293,410 5 Residential: Other 313 $50,795,230 $25,397,615 $76,192,845 $38,096,423 786 Industrial 21 $8,932,723 $13,399,085 $22,331,808 $11,165,904 -- Vacant 18 $2,764,023 -- $2,764,023 $1,382,012 --
TOTAL 2,392 $417,358,957 $217,731,586 $635,090,543 $317,545,272 5,319 Source: San Luis Obispo County Planning and Building Dept., Assessor’s Office, ParcelQuest, Wood Plc Parcel Analysis

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San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.15
Figure C.5 City of Grover Beach Dam Inundation Extent

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San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.16
Figure C. 6 Dam Inundation Map

Source San Luis Obispo County

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San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.17
Drought and Water Shortage
The City of Grover Beach’s main water supplies are from surface water and groundwater. The surface water supply source is Lake Lopez or the Lopez Project, which is also the main supply for the other communities in the Five Cities Area. Grover Beach has an entitlement of 800 acre-feet per year (afy) from the Lopez Project. Grover Beach also receives a portion of its water supply (1,198 afy) from the Arroyo Grande Plain of the Tri-Cities Mesa Subbasin of the Santa Maria Valley Groundwater Basin which also supplies water for the cities of Arroyo Grande, Pismo Beach and the Oceano CSD. A majority of water consumption is by residential properties. According the San Luis Obispo Council of Government (COG) report, 2050 Regional Growth Forecast for San Luis Obispo County (2017), the figure below shows the projected water demand in the City of Grover Beach from 2015 to 2030. The City of Grover Beach’s population is not expected to grow dramatically by 2035 and as a result the water demand is not projected to increase over the next 20 to 30 years.

Figure C.7 Projected Water Demand in Grover Beach, 2015 to 2030 Source: 2050 Regional Growth Forecast for San Luis Obispo County, San Luis Obispo Council of Governments and Beacon Economics, June 2017 Severe drought events in recent years have caused concerns on the impact on the City’s limited water supply. In 2006 the City of Grover Beach adopted the Water Shortage Contingency Plan which defines what constitutes a recommendation for a water shortage proclamation, provides specific triggers for actions stages and designated responsibilities of City Council and Departments. The Grover Beach City Council annually reviews rainfall and other information on water amounts, and determines the appropriate actions to take. In 2014, with the below average rainfall and low storage levels in Lopez Lake, City Council determined the City’s water supplies were headed towards a condition of severe water shortage. As a result, on June 16, 2014 the City Council declared a Stage III Water Shortage and mandatory water conservation measures. The City had previously been under a Stage II Declaration for two years that placed voluntary prohibitions on water usage. The Declaration required those voluntary prohibitions become mandatory and all customers to reduce their water usage by 10 percent.

Stage III also gave the City the authority to impose penalties for failure to comply with water reduction or use prohibitions.

The returned Data Collection Guide from the City of Grover Beach Planning Team noted that due to the region’s water supply being served by a mix of reservoir and pumped well water, the state-wide drought in California has led to regional impacts, including watering restrictions that according to the Planning Team has led to landscaping on many properties to die, increasing the risk of wildfire for some properties.

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San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.18
Earthquake
The City of Grover Beach is vulnerable to various types of seismic hazards including fault rupture, groundshaking and liquefaction. The Wilmar Avenue fault is the only mapped fault near the City of Grover Beach. The fault runs along the northern portion of the City limits. The Wilmar Avenue fault is exposed in the sea cliff near Pismo Beach and buried portions are generally aligned along the Highway 101. The fault is considered potentially active and a moderate fault rupture hazard to the City of Grover Beach.

In addition to the Wilmar Avenue fault there are a number of active and potentially active faults in proximity of the Grover Beach that are capable of producing strong groundshaking within the City limits. According to the Technical Background Report of the County Safety Element (1999), the San Andreas fault and the offshore Hosgri fault present the most likely sources of groundshaking for Grover Beach. The following table from the Technical Background Report and recreated for the 2019 Hazard Mitigation Plan, show the potential sources of groundshaking and approximate distance from Grover Beach.

Table C.9 Sources of Groundshaking in the Vicinity of Grover Beach Fault
Approximate
Distance
(kilometers)*
Maximum
Earthquake
Maximum
Probable
Earthquake
Anticipated
Acceleration
Range (g)
Wilmar Avenue 1 6.5 4 0.1-0.7
Blind Thrust Point San Luis 3 7.5 6 0.3-0.7
Los Osos 9 7 5 0.1-0.4
Pecho 6 6.3 3 <0.1-0.3
Casmalia-Orcutt- Little Pine 19 7.5 6 0.1-0.4
Hosgri 21 7.5 6.5 0.2-0.3
Rinconada 23 7.5 6.3 0.1-0.3
Los Alamos- Base Line 27 7 5.8 0.1-0.2
San Andreas 66 8.3 8 0.1-0.2
*Measured from Grand Avenue and North 8th
Source: San Luis Obispo County Safety Element Technical Background Report, December 1999 As a coastal community, portions of Grover Beach are underlain by layers of unconsolidated sand and young alluvium which have a high potential to become liquefied during groundshaking events. The following table shows the various property types in the City of Grover Beach at risk of liquefaction. Based on this analysis residential property types, including mobile and manufactured homes, are at the greatest risk of liquefaction in Grover Beach compared to other types of properties in the community. There are 4,243 residential properties at risk with a combined improved value of $747,660,747. Figure C.8 below depicts the areas of Grover Beach at risk of liquefaction.

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City of Grover Beach | February 2020 Annex C.19
Table C.10 City of Grover Beach Moderate Liquefaction Risk by Property Type Property Type Parcel Count Improved Value
Agricultural 1 $3,139
Commercial 242 $71,707,475
Government/Utilities 37 $21,533
Other/Exempt/Misc. 135 $31,280,820
Residential 3,054 $506,840,814
Multi-Family Residential 600 $135,833,108
Mobile/Manufactured Homes 39 $2,752,757
Residential: Other 550 $102,234,078
Industrial 27 $11,177,087
Vacant 27 $4,262,765
Total 4,712 $866,113,576
Source: San Luis Obispo County Planning and Building Dept., Assessor’s Office, ParcelQuest, Wood Plc Parcel Analysis

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San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.20
Figure C.8 Areas of the City of Grover Beach at Risk of Liquefaction

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San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.21
Flood
The City of Grover Beach suffers from regular flooding in isolated areas. Flooding generally occurs after heavy rainfall events and overtopping of creeks and rivers. The Arroyo Grande Creek poses a risk of overtopping and causes Meadow Creek to flood along the western and northern portions of the City. Flooding along Meadow Creek has caused roads to be blocked by flood waters, causing difficulties in access to and egress from portions of the City. According to the City’s Safety Element, northern and western portions of the City adjacent to Meadow Creek are at the greatest risk of being impacted by a 100-year flood. The areas at risk of flooding in the northern portions of the City are isolated to an area south of U.S. 101 and north of Nacimiento Avenue where a mobile home subdivision is located. The South Grover Beach and West Grover Beach neighborhoods are also reported to experience flooding issues. Flooding in the western portion of the City is isolated to areas west of the Union Pacific Railroad tracks and areas just east of the railroad tracks in the southwest corner of the City where drainage is trapped by the railroad grade.

The City’s 2015 LHMP notes two properties located below street level that are subject to local flooding issues.

One parcel located at South 5th Street and Manhattan Avenue is subject to flooding from a 50-year storm event when sandbags are not used or if cars are parked on the street. The second parcel is located at 6th Street and Mentone Avenue is subject to a 75-100-year storm event, but after an asphalt berm was constructed flooding was alleviated under storms of lesser magnitude. Refer to the Flood Section in the Base Plan for further information on the areas of that are at risk of flooding as well as past flood events that have impacted the City of Grover Beach.

Values at Risk
A flood vulnerability assessment was completed during the 2019 update, following the methodology described in Section 5 of the Base Plan. Table C.11 and Table C.12 summarize the values at risk in the City’s 100-year and 500-year floodplain, respectively. These tables also detail loss estimates for each flood.

Table C.11 City of Grover Beach’s FEMA 1% Annual Chance Flood Hazard by Property Type Property Type Parcel Count Improved Value Content Value Total Value Loss Estimate Commercial 1 $751,181 $751,181 $1,502,362 $375,591
Government/Utilities 4 -- -- $0 $0
Other/Exempt/Misc. 1 -- -- $0 $0
Residential 6 $928,659 $464,330 $1,392,989 $348,247
Mobile/Manufactured Homes 21 $1,087,774 $543,887 $1,631,661 $407,915 Total 33 $2,767,614 $1,759,398 $4,527,012 $1,131,753
Source: San Luis Obispo County Planning and Building Dept., Assessor’s Office, ParcelQuest, Wood Plc Parcel Analysis Table C.12 City of Grover Beach’s FEMA 0.2% Annual Chance Flood Hazard by Property Type Property Type Parcel Count Improved Value Content Value Total Value Loss Estimate Government/Utilities 1 -- -- $0 $0
Other/Exempt/Misc. 1 $137,118 -- $137,118 $34,280
Mobile/Manufactured Homes 1 $116,341 $58,171 $174,512 $43,628 Vacant 1 $62,500 -- $62,500 $15,625
Total 4 $315,959 $58,171 $374,130 $93,532
Source: San Luis Obispo County Planning and Building Dept., Assessor’s Office, ParcelQuest, Wood Plc Parcel Analysis

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City of Grover Beach | February 2020 Annex C.22
Based on this analysis, the City of Grover Beach has significant assets at risk to the 100-year and greater floods.

There are 33 improved parcels located within the 100-year floodplain for a total value of over $4 million. An additional 4 improved parcels valued at $374,130 fall within the 500-year floodplain.

Applying the 25 percent damage factor as previously described in Section 5 of the Base Plan, there is a 1 percent chance in any given year of a 100-year flood causing roughly $1 million in damage in the City of Grover Beach, and a 0.2 percent chance in any given year of a 500-year flood causing $1,225,285 in damages (combined damage from both floods). The tables above show the properties at risk to flooding in the City of Grover Beach in relation to the mapped floodplain, based on the parcels that have improvements and parcel centroids that intersect the flood hazard areas.

Limitations: This model may include structures in the floodplains that are elevated at or above the level of the base-flood elevation, which will likely mitigate flood damage. Also, the assessed values are well below the actual market values. Thus, the actual value of assets at risk may be significantly higher than those included herein.

Population at Risk
Using parcel data from the County and the digital flood insurance rate map, population at risk was calculated for the 100-year and 500-year floods based on the number of residential properties at risk and the average number of persons per household (2.47). The following are at risk to flooding in the City of Grover Beach:
• 100-year flood— 68 people
• 500-year flood— 3 people
• Total flood— 71 people
Insurance Coverage, Claims Paid, and Repetitive Losses
The City of Grover Beach joined the National Flood Insurance Program (NFIP) on August 1, 1984. NFIP Insurance data indicates that as of April 18, 2019, there were 36 flood insurance policies in force in the City with $9,940,700 of coverage. All 36 policies were residential (32 for single-family homes, 2 for 2-4-unit homes and 2 for all other residential). There are 8 polices in A01-30 & AE zones and no policies in A zones. The remaining 28 are in B, C, and X zones.

There have been 2 historical claims for flood losses totaling $14,881.56. Both claims were for residential properties (1 single family and 1 2-4 family) and were in B, C or X zones; According to the FEMA Community Information System accessed 4/18/2019 there are no Repetitive Loss or Severe Repetitive Loss properties located in the jurisdiction.

Critical Facilities at Risk
Critical facilities are those community components that are most needed to withstand the impacts of disaster as previously described. Based on GIS analysis of the provided critical facility dataset by the County of San Luis Obispo combined with the HIFLD dataset, there are no critical facilities at risk of flooding in a 100-year or 500- year storm event. However, the Planning Team notes that the City’s Train Station as well as the Nacimiento Sanitary Sewer Lift Station (and possibly other critical facilities not included in the countywide dataset used for analysis) should be at risk of flooding of the 100-year event, as they fall within the AE special flood hazard areas.

Coastal Storm/Coastal Erosion/Sea Level Rise
The City of Grover Beach is characterized by its sandy beaches backed by low sand dunes covered with dense vegetation. The sandy beaches provide structures and development with moderate protection from storm

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City of Grover Beach | February 2020 Annex C.23
waves, although active erosion of beaches and dunes currently impacts low-lying coastal recreation uses (i.e. golf course), commercial, and residential (i.e. mobile homes) structures. The City has been impacted by storm wave hazards in the past; during a winter storm in 1983, timber beach access ramps were damaged by storm waves.

Refer to Section 5 of the Base Plan for more information on the risk that coastal hazards pose to San Luis Obispo County and the City of Grover Beach.

As part of the 2019 HMP planning effort, a sea level rise risk assessment was completed to determine how sea level rise may affect coastal jurisdictions and critical facilities and how coastal flooding might be exacerbated in the future. Table C.13 and Table C.14 summarize the properties at risk of inundation by sea level rise and sea level rise combined with a 1% annual chance coastal flood. The area of inundation by sea level rise and sea level rise combined with the 1% coastal flood are shown in Figure C.9 and Figure C.10, respectively. No critical facilities were determined to be at risk in the sea-level rise scenarios. See Section 5.3.4 Coastal Storm/Coastal Erosion/Sea Level Rise in the base plan for more details on the scenarios and data sources used for this analysis.

Table C.13 Properties Inundated by Sea Level Rise and Sea Level Rise with 1% Annual Chance Flood Property Type
25-cm
SLR
75-cm
SLR
300-cm
SLR
25-cm SLR
w/ 1% Flood
75-cm SLR
w/ 1% Flood
300-cm SLR
w/ 1% Flood
Commercial -- -- 6 -- -- 6
Government/Utilities -- -- 4 -- -- 7
Other/Exempt/Misc. -- -- 4 -- -- 9
Residential -- -- 2 -- -- 15
Multi-Family Residential -- -- 3 -- -- 9
Mobile/Manufactured Homes -- -- -- -- -- 1
Industrial -- -- 1 -- -- 3
Total -- -- 20 -- -- 50
Source: Wood analysis with USGS CoSMoS 3.1 data
Table C.14 Improved Values of Properties Inundated by Sea Level Rise and Sea Level Rise with 1% Annual Chance Flood
Property Type
25-cm
SLR
75-cm
SLR
300-cm
SLR
25-cm SLR
w/ 1% Flood
75-cm SLR
w/ 1% Flood
300-cm SLR
w/ 1% Flood
Commercial -- -- $834,388 -- -- $834,388
Government/Utilities -- -- -- -- -- --
Other/Exempt/Misc. -- -- $3,181,722 -- -- $3,883,627
Residential -- -- $198,637 -- -- $1,675,517
Multi-Family Residential -- -- $971,575 -- -- $3,466,989 Mobile/Manufactured Homes -- -- -- -- -- $305,343
Industrial -- -- $62,392 -- -- $107,956
Total -- -- $5,248,714 -- -- $10,273,820
Source: Wood analysis with USGS CoSMoS 3.1 data

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City of Grover Beach | February 2020 Annex C.24
Figure C.9 Grover Beach Sea Level Rise Scenario Analysis: Tidal Inundation Only

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San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.25
Figure C.10 Grover Beach Sea Level Rise Scenario Analysis: Tidal Inundation and 1% Annual Chance Flood

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San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.26
Tsunami and Seiche
Tsunami inundation poses a risk to all coastal communities in the County of San Luis Obispo. Offshore faults and related seismic activity could cause a tsunami event off the coast of Grover Beach, even if the faults are thousands of miles away. Grover Beach’s wide beaches and coastal dunes in general provide protection from coastal hazards, although the low-lying areas where Meadow Creek meets the ocean is considered to be at moderate risk of tsunami hazards. Based on the GIS analysis there is one critical facility, a water treatment facility, that is at risk of tsunami inundation. According to the City’s 2015 LHMP the areas shown on Figure C.8 are vulnerable to tsunami hazards.

Table C.13 below breaks down the tsunami risk in the City of Grover Beach by property type.

Table C.15 Properties at Risk of Tsunami Inundation
Property Type
Property
Count
Improved
Value
Content
Value Total Value Loss Estimate Population
Commercial 64 $11,703,763 $11,703,763 $23,407,526 $23,407,526 -- Government/Utilities 14 -- -- $0 $0 --
Other/Exempt/Misc. 34 $15,190,469 -- $15,190,469 $15,190,469 -- Residential 59 $6,180,075 $3,090,038 $9,270,113 $9,270,113 148 Multi-Family Residential 31 $8,830,232 $4,415,116 $13,245,348 $13,245,348 78 Mobile/Manufactured
Homes
1 $305,343 $152,672 $458,015 $458,015 3
Residential: Other 8 $1,100,411 $550,206 $1,650,617 $1,650,617 20 Industrial 14 $5,461,004 $8,191,506 $13,652,510 $13,652,510 -- Vacant 8 $1,859,350 -- $1,859,350 $1,859,350 --
Total 233 $50,630,647 $28,103,300 $78,733,947 $78,733,947 249 Source: San Luis Obispo County Planning and Building Dept., Assessor’s Office, ParcelQuest, Wood Plc Parcel Analysis Based on this analysis there are 233 properties with a combined value of over $78 million vulnerable to the impacts of a tsunami. Of the properties at risk, 99 are residential properties (including mobile/manufactured homes) and have a combined loss estimate of over $16 million and 64 are commercial properties.

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San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.27
Figure C.11 Areas of City of Grover Beach at Risk to Tsunami Inundation

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San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.28
The area along Highway 1 is also expected to be in the tsunami inundation zone, which would have cascading impacts on people being able to evacuate. The LPT noted that Grover Beach swells with beachgoing tourists including an estimated 10,000 to 40,000 visitors to the Oceano Dune State Park on a busy summer weekend or holiday; these visitors may not be familiar with the risk posed by tsunamis, leading them to ignore warnings.

Refer to Section 5 of the Base Plan for additional information related to the past tsunami events and analysis on future vulnerability.

Human Caused: Hazardous Materials
The Cal OES Warning Center reports 21 hazardous materials incidents in the City of Grover Beach from 1994 through October 24, 2018; as noted in Section 5.3.13 of the county plan, this likely excludes a large number of unreported minor spills. This constitutes 1% of the hazardous materials incidents reported countywide during the same time frame and averages out to roughly 0.8 incidents per year. As noted in Section 5.3.13, only around 6% of reported hazardous materials incidents result in injuries, fatalities, or evacuations. As shown in Base Plan there are no significant hazardous materials facilities located in the City. However, Grover Beach sits within the Emergency Planning Zone for the Diablo Canyon Nuclear Power Plant.

Capability Assessment
Capabilities are the programs and policies currently in use to reduce hazard impacts or that could be used to implement hazard mitigation activities. This capabilities assessment is divided into five sections: regulatory mitigation capabilities, administrative and technical mitigation capabilities, fiscal mitigation capabilities, mitigation outreach and partnerships, and other mitigation efforts.

To develop this capability assessment, the jurisdictional planning representatives used a matrix of common mitigation activities to inventory which of these policies or programs were in place. The team then supplemented this inventory by reviewing additional existing policies, regulations, plans, and programs to determine if they contributed to reducing hazard-related losses.

During the plan update process, this inventory was reviewed by the jurisdictional planning representatives and Wood consultant team staff to update information where applicable and note ways in which these capabilities have improved or expanded. Additionally, in summarizing current capabilities and identifying gaps, the jurisdictional planning representatives also considered their ability to expand or improve upon existing policies and programs as potential new mitigation strategies. The City of Grover Beach’s capabilities are summarized below.

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City of Grover Beach | February 2020 Annex C.29
C.4.1 Regulatory Mitigation Capabilities
Table C.16 City of Grover Beach Regulatory Mitigation Capabilities Regulatory Tool Yes/No Comments
General plan Yes
Zoning ordinance Yes
Subdivision ordinance Yes
Growth management ordinance Yes
Floodplain ordinance Yes Chapter 5 Development Code, 2012 Other special purpose ordinance (stormwater,
water conservation, wildfire) Yes Stormwater only
Building code Yes
Fire department ISO rating Yes 3
Erosion or sediment control program Yes
Stormwater management program Yes
Site plan review requirements Yes
Capital improvements plan Yes
Economic development plan Yes City of Grover Beach Final Economic Development Strategy April 11, 2017
Local emergency operations plan Yes
Other special plans Yes
Local Coastal Program (Aug. 15, 2014), Open
Space Management Plan, Continuity of
Operations Plan; Recovery Plan
Flood Insurance Study or other engineering
study for streams Yes
Elevation certificates (for floodplain
development) Yes
C.4.2 Administrative/Technical Mitigation Capabilities
Table C.17 identifies the personnel responsible for activities related to mitigation and loss prevention in Grover Beach

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City of Grover Beach | February 2020 Annex C.30
Table C.17 City of Grover Beach Administrative/Technical Mitigation Capabilities Personnel Resources
Yes/
No Department/Position
Planner/engineer with knowledge of land
development/land management practices Yes Community Development, Public Works Director/Engineer Engineer/professional trained in construction
practices related to buildings and/or infrastructure Yes Public Works Director/Engineer, Building official (contract) Planner/engineer/scientist with an understanding of
natural hazards Yes Public Works Director/Engineer, Building official (contract) Personnel skilled in GIS Yes Community Development
Full time building official No Contract
Floodplain manager Yes Public Works Director/Engineer (?) Emergency manager Yes
Grant writer No
GIS Data Resources
(Hazard areas, critical facilities, land use, building
footprints, etc.)
Yes
Warning systems/services
(Reverse 9-11, outdoor warning signals) Yes
C.4.3 Fiscal Mitigation Capabilities
Table C.18 identifies financial tools or resources that the City could potentially use to help fund mitigation activities.

Table C.18 City of Grover Beach Fiscal Mitigation Capabilities Financial Resources
Accessible/Eligible
to Use (Yes/No)
Community Development Block Grants Yes
Capital improvements project funding Yes
Authority to levy taxes for specific purposes Yes (As needed) Fees for water, sewer, gas, or electric services No
Impact fees for new development Yes
Incur debt through general obligation bonds Yes
Incur debt through special tax bonds Yes
Incur debt through private activities No
Withhold spending in hazard prone areas No
C.4.4 Opportunities for Enhancement
Based on the capabilities assessment, the City of Grover Beach has several existing mechanisms in place that already help to mitigate hazards. In Grover Beach’s 2015 LHMP the City conducted a “self-assessment of capability” in which they rated (limited to high) the degree of capability they believed the community had. The City noted having a high degree of capability for planning and regulatory capabilities and political capability, but a moderate rating for their administrative, technical, and fiscal capabilities. This may be an opportunity for the City to expand or improve on these policies and programs to further protect the community. Future

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.31
improvements may include providing training for staff members related to hazards or hazard mitigation grant funding in partnership with the County and Cal OES. Additional training opportunities will help to inform City staff members on how best to integrate hazard information and mitigation projects into their departments.

Continuing to train City staff on mitigation and the hazards that pose a risk to the City of Grover Beach will lead to more informed staff members who can better communicate this information to the public.

Mitigation Strategy
C.5.1 Mitigation Goals and Objectives
During the 2019 Planning Process the Grover Beach Planning Team reviewed the mitigation goals and objectives from the 2015 LHMP and determined the existing number and intent of the goals and objectives continue to be appropriate, and no revisions or additions were necessary. The City of Grover Beach’s 2019 hazard mitigation goals and objectives are the following:

Goal 1. Minimize the level of damages and losses due to earthquake.

Objective 1.a - Develop a comprehensive approach to reducing the level of damage and losses due to earthquakes.

Objective 1.b – Perform a safety review of all current City structures and facilities, paying close attention to disaster proofing all facilities. Convene a group of department heads to prioritize the needs and research funding strategies.

Objective 1.c – Develop disaster preparedness caches of supplies, tools, and equipment for use by City employees, so that they may continue to perform their duties during a major emergency.

Goal 2. Minimize the level of damage and losses due to flooding.

Objective 2.a – Research and identify flooding vulnerability within the City of Grover Beach.

Goal 3. Minimize the level of damage and losses to people due to wildland and structure fires.

Objective 3.a – Educate the public about wildland and structure fire danger.

Goal 4. Minimize the level of damage and losses to people and surrounding areas due to tsunami events and increase understanding and response to tsunamis.

Objective 4.a – Increase the understanding and response to tsunamis within the community by working with Federal and State agencies to better understand and prepare for the hazards of tsunamis, and improve the ability to respond to tsunami warnings provided by NOAA’s West Coast and Alaska Tsunami Warning Center.

Goal 5. Minimize the potential for dam failure and the impacts from such incidents.

Objective 5.a – Work with regional partners to reduce the negative impact on the community as a result of a dam incident or failure through proper planning and infrastructure maintenance and improvement.

Objective 5.b – Develop a public outreach program to educate residents and businesses in the dam failure inundation areas on their responsibilities and emergency preparedness.

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City of Grover Beach | February 2020 Annex C.32
Objective 5.c – Develop a dam failure emergency response plan.

Objective 5.d – Develop a hazard alert system to allow the city and regional partners to contact and alert our residents and businesses about the possibility of a dam failure and flooding caused by a dam failure.

Continued Compliance with the National Flood Insurance Program The City has been an NFIP participating community since 1984. In addition to the mitigation actions identified herein the City will continue to comply with the NFIP. This includes ongoing activities such as enforcing local floodplain development regulations, including issuing permits for appropriate development in Special Flood Hazard Areas and ensuring that this development is mitigated in accordance with the regulations. This will also include periodic reviews of the floodplain ordinance to ensure that it is clear and up to date and reflects new or revised flood hazard mapping.

C.5.2 Completed 2015 Mitigation Actions
Grover Beach has not completed any of the mitigation actions from the 2015 LHMP, although of Grover Beach’s thirteen mitigation actions, nine (9) are implemented annually and two (2) are in progress to be completed.

These actions that are implemented annually help to reduce vulnerability to hazards and increase local capability to implement additional mitigation actions.

C.5.3 Mitigation Actions
The planning team for the City of Grover Beach identified and prioritized the following mitigation actions based on the risk assessment. Background information and information on how each action will be implemented and administered, such as ideas for implementation, responsible office, potential funding, estimated cost, and timeline, are also included. Actions were prioritized using the process described in Section 7.2.1 of the Base Plan.

Actions with an ‘*’ are those that mitigate losses to future development.

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.29
Table C. 19 City of Grover Beach’s Mitigation Action Plan ID Hazard(s)
Mitigated Description/Background/Benefits Lead Agency and Partners Cost
Estimate
Potential
Funding Priority Timeline
Status/
Implementation
Notes
GB.1
Adverse
Weather:

Wind, Rain,
Heat
Reduce the negative impact on the community due to
weather-related incidents that could include heavy
rain, high winds and extreme heat. Benefits: Improved
water runoff in low-lying areas, reduced pooling and
low impact street flooding; tree trimming, and removal
of old trees will reduce falling limbs and trees
Public Works
Department
$125,000
-
$250,000
PDM grants;
general funds;
capital
improvement
funds; staff
time
Low 3-5 yrs. New
GB.2
Agricultural
Pest
Infestation
and Disease
Help reduce the negative impact on the agricultural
community due to pest infestation and disease.

Benefits: Through community development and
planning, work with existing agricultural property
owners to develop safeguards to protect against pest
infestation and disease
Community
Development
Department
Little to
no Cost
Private
funding and
staff time
Medium 3-5 yrs. New
GB.3*
Coastal
Storm,
Erosion and
Sea Level
Rise
Work in partnership with the State of California and
County of San Luis Obispo to identify community
impacts associated with coastal erosion through sea
level rise and storms. In coordination with the State
and County, map areas of the City that may be
affected by sea level rise. Benefits: Lessen the impacts on the community from the effects of sea level rise and coastal erosion
Public Works
Department;
Community
Development;
Emergency
Preparedness
Less than
$10,000
PDM grants;
general funds;
capital
improvement
funds; staff
time
Medium
More
than 5
yrs.

New
GB.4* Dam Failure
In collaboration with state, county and other local
governments, reduce the negative impact on the
community as a result of a dam incident or failure
through proper planning and infrastructure
maintenance and improvement. City Staff will map
areas of potential inundation via its Geographic
Informational System and continue to implement the
San Luis Obispo County Office of Emergency Services
(OES) Emergency Plan. Benefits: Lessen the potential
Public Works
Department;
Community
Development;
Emergency
Preparedness
Less than
$10,000
PDM grants;
general funds;
capital
improvement
funds; staff
time
Medium 3-5 yrs. New

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San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.30
ID Hazard(s)
Mitigated Description/Background/Benefits Lead Agency and Partners Cost
Estimate
Potential
Funding Priority Timeline
Status/
Implementation
Notes
for dam failure and reduce the likelihood of this hazard occurring
GB.5* Drought
In collaboration with state, county and other local
governments, reduce the negative impact of drought
on the community through proper planning and
infrastructure maintenance and improvement; continue
to monitor well levels to prevent seawater intrusion
while pursuing opportunities for regional recycled
water projects that will result in groundwater injection; implement water efficient landscaping. Benefits: Avoid
sea water intrusion; lessen potential negative impacts
on the community as a result of drought or water
shortage
Public Works;
Community
Development
Department
Less than
$10,000
PDM grants;
general funds;
capital
improvement
funding; staff
time
Medium
More
than 5
yrs.

New
GB.6 Earthquake Identify and catalog seismically vulnerable structures Emergency Preparedness
Less than
$10,000
PDM Grant,
General
Funds, Capital
Improvement
funds, Staff
time
High
More
than 5
yrs.

Deferred. Limited
URM structures.

Limited staff and
fiscal resources
GB.7* Earthquake Implement policies, procedures and regulations which reduce the exposure to earthquake hazards
Emergency
Preparedness
Little to
no cost
PDM Grant,
General
Funds, Capital
Improvement
funds, Staff
time
High
More
than 5
yrs.

Annual
Implementation.

Building and Fire
Codes
GB.8 Earthquake Protect the improved property and infrastructure vulnerable to earthquake hazards
Emergency
Preparedness
Less than
$10,000
PDM Grant,
General
Funds, Capital
Improvement
High
More
than 5
yrs.

Annual
Implementation.

Building and Fire
Codes

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.31
ID Hazard(s)
Mitigated Description/Background/Benefits Lead Agency and Partners Cost
Estimate
Potential
Funding Priority Timeline
Status/
Implementation
Notes
funds, Staff
time
GB.9 Fire Encourage the 100' Defensible Space around
structures in the Wildland Urban Interface
Fire
Department
Little to
no cost
California Fire
Safe Council,
Fire
Prevention
Grant
Funding, PDM
Grant,
General
Funds, Capital
Improvement
funds, Staff
Time
Medium Annual Annual
Implementation
GB.10 Fire Continue weed abatement program
Fire
Department
Little to
no cost
California Fire
Safe Council,
Fire
Prevention
Grant
Funding, PDM
Grant,
General
Funds, Capital
Improvement
funds, Staff
Time
Medium Annual Annual
Implementation
GB.11
*
Fire Enforce building codes and ordinances that eliminate the use of wood shake roofs
Fire
Department
Little to
no cost
California Fire
Safe Council,
Fire
Prevention
Medium Annual Annual
Implementation

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.32
ID Hazard(s)
Mitigated Description/Background/Benefits Lead Agency and Partners Cost
Estimate
Potential
Funding Priority Timeline
Status/
Implementation
Notes
Grant
Funding, PDM
Grant,
General
Funds, Capital
Improvement
funds, Staff
Time
GB.12
*
Fire Enforce codes and ordinances that require fire
sprinkler systems in all new structures constructed
Fire
Department
Little to
no cost
California Fire
Safe Council,
Fire
Prevention
Grant
Funding, PDM
Grant,
General
Funds, Capital
Improvement
funds, Staff
Time
Medium Annual Annual
Implementation
GB.13
*
Fire
Create a Fire-Smart Community by developing a
comprehensive approach to reducing damage and loss
due to fires; encourage the 100' defensible space
around structures in the Wildland-Urban Interface
(WUI); continue weed abatement program to reduce
the threat of fire around open spaces; enforce building codes and ordinances that eliminate the use of wood
shake roofs; enforce codes and ordinances that require
fire sprinkler systems consistent with the California
Building Code
Fire
Department;
Community
Development;
Emergency
Preparedness
Little to
no cost
California Fire
Safe Council;
Fire
Prevention
Grants; PDM
Grants; FEMA
funding;
General
Funding;
Capital
Improvement
Medium
More
than 5
yrs.

New

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.33
ID Hazard(s)
Mitigated Description/Background/Benefits Lead Agency and Partners Cost
Estimate
Potential
Funding Priority Timeline
Status/
Implementation
Notes
Funds; Staff
Time
GB.14
*
Flood
Implement policies procedures and regulations which
reduce the exposure to flood hazards; protect the
improved property, natural resources and life
vulnerable to flood hazards; reduce the vulnerability of community assets, particularly research and identify
flooding vulnerability within the city by identifying
flood vulnerability within the city by identifying parcels with flood zones; identify funding needs and funding
sources; apply for pre-disaster mitigation grants and
commence mitigation projects; conclude mitigation
projects; evaluate effectiveness of mitigation actions
and critical facilities located in the 100-year floodplain Public Works;
Parks and
Recreation;
Community
Development;
Emergency
Preparedness
Little to
no cost
PDM grants;
general funds;
capital
improvement
funds; staff
time
Medium
More
than 5
yrs.

New
GB.15
*
Flood Implement policies, procedures and regulations which reduce the exposure to flood hazards
Recreation
and
Maintenance
Services,
Public Works
and
Emergency
Preparedness
Little to
no cost
PDM Grant,
General
Funds, Capital
Improvement
funds, Staff
time
High
More
than 5
yrs.

Annual
Implementation
GB.16 Flood Protect the improved property and infrastructure vulnerable to flood hazards
Recreation
and
Maintenance
Services,
Public Works
and
Emergency
Preparedness
$500,000
to
$1,000,00
0 PDM Grant,
General
Funds, Capital
Improvement
funds, Staff
time
High
More
than 5
yrs.

Annual
Implementation

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.34
ID Hazard(s)
Mitigated Description/Background/Benefits Lead Agency and Partners Cost
Estimate
Potential
Funding Priority Timeline
Status/
Implementation
Notes
GB.17 Flood
Reduce the vulnerability of community assets,
particularly critical facilities, located in the 100-year floodplain
Recreation
and
Maintenance
Services,
Public Works
and
Emergency
Preparedness
$500,000
to
$1,000,00
0 PDM Grant,
General
Funds, Capital
Improvement
funds, Staff
time
High
More
than 5
yrs.

Annual
Implementation
GB.18 Hazardous
Materials
Require businesses that use, store or transport
hazardous materials to ensure that adequate measures
are taken to protect public health and safety;
coordinate with allied agencies to prepare for hazmat
incidents; support training and exercises in response to hazmat incidents; coordinate responses and
investigations with the county hazmat team and Five
Cities Fire; add gas pipeline mapping to the City's GIS resources; continue to monitor the manufacture,
storage, transport of hazardous materials by working
with environmental health and public safety agencies
to identify effective mitigation actions or requirements that will help reduce the risk of incidents, including the spread of released materials; coordinate with the rail
line industries to prepare for train-related hazmat
incidents
Fire
Department;
Community
Development;
Emergency
Preparedness
Less than
$10,000
California Fire
Safe Council;
Fire
Prevention
Grants; PDM
Grants; FEMA
funding;
General
Funding;
Capital
Improvement
Funds; Staff
Time
Medium 3-5 yrs. New
GB.19 Tsunami
Develop a comprehensive action plan to reduce
damage from a tsunami; display standardized and easy
to read signs alerting community members of tsunami
hazard zones, evacuation routes and evacuation sites;
review tsunami inundation areas and educational
needs; review emergency policies and training needs;
review tsunami maps and evacuation plans
Public Works;
Community
Development;
Emergency
Services
$10,000
to
$50,000
PDM grants;
general funds;
capital
improvement
funds; staff
time
Medium 3-5yrs. New

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.35
ID Hazard(s)
Mitigated Description/Background/Benefits Lead Agency and Partners Cost
Estimate
Potential
Funding Priority Timeline
Status/
Implementation
Notes
GB.20 Tsunami Review Tsunami inundation areas and educational needs
Police
Department
Little to
no costs
PDM Grant,
General
Funds, Capital
Improvement
funds, Staff
time
Medium 3-5 yrs.

In progress.

Countywide
Tsunami Plan,
and identification
of local resource
needs. Staff and
fiscal constraints
GB.21 Tsunami Review emergency policies and training needs Police Department
Little to
no costs
PDM Grant,
General
Funds, Capital
Improvement
funds, Staff
time
Medium Annual Annual
Implementation
GB.22 Tsunami Review Tsunami plans, maps, and evacuation plans Police Department
Little to
no costs
PDM Grant,
General
Funds, Capital
Improvement
funds, Staff
time
Medium 3-5 yrs.

In progress.

Countywide
Tsunami Plan,
and identification
of local resource
needs. County
Fire Chiefs
identified cityspecific
evacuation plans
as a strategic
priority. Staff and
fiscal constraints
GB.23 Dam Failure
Work with our regional partners to reduce the negative
impact on the community as a result of a dam incident
or failure through proper planning and infrastructure
maintenance and improvement.

Public Works
Department,
Community
Development
Department,
$50,00 -
$100,000
PDM Grant,
FEMA grant,
General
Funds, Capital
Improvement
Medium 5 yrs New

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.36
ID Hazard(s)
Mitigated Description/Background/Benefits Lead Agency and Partners Cost
Estimate
Potential
Funding Priority Timeline
Status/
Implementation
Notes
Emergency
Preparedness
funds, Staff
time
GB.24 Dam Failure
Develop a public outreach program to educate
residents and businesses in the dam failure inundation
areas on their responsibilities and emergency
preparedness.

Public Works
Department,
Community
Development
Department,
Emergency
Preparedness
$2,500 -
$5,000
PDM Grant,
FEMA grant,
General
Funds, Capital
Improvement
funds, Staff
time
Medium 2-3 yrs New
GB.25 Dam Failure Develop a dam failure emergency response plan.

Public Works
Department,
Community
Development
Department,
Emergency
Preparedness
$5,000 to
$10,000
PDM Grant,
FEMA grant,
General
Funds, Capital
Improvement
funds, Staff
time
Medium 2-3 yrs New
GB.26 Dam Failure
Develop a hazard alert system to allow the city and
regional partners to contact and alert our residents
and businesses about the possibility or a dam failure
and flooding caused by a dam failure.

Public Works
Department,
Community
Development
Department,
Emergency
Preparedness
Less than
$1,000,00
0 PDM Grant,
FEMA grant,
General
Funds, Capital
Improvement
funds, Staff
time
Low -
Medium 5 yrs New
* mitigates losses to future development

Annex C: City of Grover Beach

San Luis Obispo County Local Hazard Mitigation Plan
City of Grover Beach | February 2020 Annex C.36
Implementation and Maintenance
Moving forward, the City will use the mitigation action table in the previous section to track progress on implementation of each project. As illustrated in Section 7.3.1 of the Base Plan, much progress has been made since the plan was originally developed. Implementation of the plan overall is discussed in Section 8 in the Base Plan.

C.6.1 Incorporation into Existing Planning Mechanisms
The information contained within this plan, including results from the Vulnerability Assessment, and the Mitigation Strategy will be used by the City to help inform updates and the development of local plans, programs and policies. The Public Works Department may utilize the hazard information when designing and implementing the City’s capital improvement projects, and the Planning and Building Divisions within the Community Development Department may utilize the hazard information when reviewing a site plan or other type of development applications. The City will also incorporate this LHMP into the Safety Element of their General Plan, as recommended by Assembly Bill (AB) 2140.

As described in Section 8 Implementation and Monitoring, the HMPC representatives from Grover Beach will report on efforts to integrate the hazard mitigation plan into local plans, programs and policies and will report on these efforts at the annual HMPC plan review meeting.

C.6.2 Monitoring, Evaluation and Updating the Plan
The City will follow the procedures to monitor, review, and update this plan in accordance with San Luis Obispo County as outlined in Section 8 of the Base Plan. The City will continue to involve the public in mitigation, as described in Section 8.3 of the Base Plan. The Chief of Police will be responsible for representing the City in the County HMPC, and for coordination with City staff and departments during plan updates. The City realizes it is important to review the plan regularly and update it every five years in accordance with the Disaster Mitigation Act Requirements as well as other State of California requirements.

Appendix C‐ 60 Day Notification to Cities and Counties
C i t y o f G r o v e r B e a c h

DEPARTMENT OF PUBLIC WORKS
154 S. 8th Street ❖Grover Beach, CA 93433 ❖805/473-4530 ❖[email protected] Visit our website at www.groverbeach.org
October 8, 2021
Wade Horton
County Administrative Officer
County of San Luis Obispo Public Works Department
1055 Monterey Street
San Luis Obispo, CA 93408
Subject: City of Grover Beach Urban Water Management Plan Update – 60 Day Notification Letter Dear Mr. Horton:

The City of Grover Beach (City) is currently in the process of reviewing and updating its Urban Water Management Plan (UWMP) for the 2020 cycle. The City is also preparing a Water Shortage Contingency Plan (WSCP), a detailed proposal for the City’s actions in the event of a water shortage condition. The Department of Water Resources requires water suppliers to update their UWMP every five years. Among other things, the UWMP will evaluate current and projected water supplies and demands within the City’s service area over a 20-year planning horizon.

The City encourages local agencies, the public, and other interested parties in its service area to participate in the update process. If necessary, a stakeholder workshop may be scheduled in November 2021 to review the administrative draft. The City plans to make a copy of the draft 2020 UWMP and WSCP available for public review by October 2021. At that time, the plans will be available for review on the City’s website, https://www.grover.org/.

The City of Grover Beach will review and take action on the 2020 UWMP and WSCP at its December City Council Meeting on December 13, 2021 at 6:00 PM at the Council Chamber. Members of the public are welcome to attend. Thank you for your involvement with the City’s 2020 UWMP and WSCP. Please send comments to:

Robert Lepore, GISP
MKN & Associates, Inc.
(805) 904-6530
[email protected]
Sincerely,
Gregory A. Ray, PE
Public Works Director/City Engineer
C i t y o f G r o v e r B e a c h

DEPARTMENT OF PUBLIC WORKS
154 S. 8th Street ❖Grover Beach, CA 93433 ❖805/473-4530 ❖[email protected] Visit our website at www.groverbeach.org
October 8, 2021
Bill Robeson
Public Works Director
City of Arroyo Grande
300 E. Branch St.

Arroyo Grande, CA 93420
Subject: City of Grover Beach Urban Water Management Plan Update – 60 Day Notification Letter Dear Mr. Robeson:

The City of Grover Beach (City) is currently in the process of reviewing and updating its Urban Water Management Plan (UWMP) for the 2020 cycle. The City is also preparing a Water Shortage Contingency Plan (WSCP), a detailed proposal for the City’s actions in the event of a water shortage condition. The Department of Water Resources requires water suppliers to update their UWMP every five years. Among other things, the UWMP will evaluate current and projected water supplies and demands within the City’s service area over a 20-year planning horizon.

The City encourages local agencies, the public, and other interested parties in its service area to participate in the update process. If necessary, a stakeholder workshop may be scheduled in November 2021 to review the administrative draft. The City plans to make a copy of the draft 2020 UWMP and WSCP available for public review by October 2021. At that time, the plans will be available for review on the City’s website, https://www.grover.org/.

The City of Grover Beach will review and take action on the 2020 UWMP and WSCP at its December City Council Meeting on December 13, 2021 at 6:00 PM at the Council Chamber. Members of the public are welcome to attend. Thank you for your involvement with the City’s 2020 UWMP and WSCP. Please send comments to:

Robert Lepore, GISP
MKN & Associates, Inc.
(805) 904-6530
[email protected]
Sincerely,
Gregory A. Ray, PE
Public Works Director/City Engineer
C i t y o f G r o v e r B e a c h

DEPARTMENT OF PUBLIC WORKS
154 S. 8th Street ❖Grover Beach, CA 93433 ❖805/473-4530 ❖[email protected] Visit our website at www.groverbeach.org
October 8, 2021
Benjamin A. Fine, PE
Director of Public Works/City Engineer
City of Pismo Beach
760 Mattie Road
Pismo Beach, CA 93449
Subject: City of Grover Beach Urban Water Management Plan Update – 60 Day Notification Letter Dear Mr. Fine:

The City of Grover Beach (City) is currently in the process of reviewing and updating its Urban Water Management Plan (UWMP) for the 2020 cycle. The City is also preparing a Water Shortage Contingency Plan (WSCP), a detailed proposal for the City’s actions in the event of a water shortage condition. The Department of Water Resources requires water suppliers to update their UWMP every five years. Among other things, the UWMP will evaluate current and projected water supplies and demands within the City’s service area over a 20-year planning horizon.

The City encourages local agencies, the public, and other interested parties in its service area to participate in the update process. If necessary, a stakeholder workshop may be scheduled in November 2021 to review the administrative draft. The City plans to make a copy of the draft 2020 UWMP and WSCP available for public review by October 2021. At that time, the plans will be available for review on the City’s website, https://www.grover.org/.

The City of Grover Beach will review and take action on the 2020 UWMP and WSCP at its December City Council Meeting on December 13, 2021 at 6:00 PM at the Council Chamber. Members of the public are welcome to attend. Thank you for your involvement with the City’s 2020 UWMP and WSCP. Please send comments to:

Robert Lepore, GISP
MKN & Associates, Inc.
(805) 904-6530
[email protected]
Sincerely,
Gregory A. Ray, PE
Public Works Director/City Engineer
C i t y o f G r o v e r B e a c h

DEPARTMENT OF PUBLIC WORKS
154 S. 8th Street ❖Grover Beach, CA 93433 ❖805/473-4530 ❖[email protected] Visit our website at www.groverbeach.org
October 8, 2021
Will Clemens
General Manager
Oceano Community Services District
1655 Front Street
Oceano, CA 93445
Subject: City of Grover Beach Urban Water Management Plan Update – 60 Day Notification Letter Dear Mr. Clemens:

The City of Grover Beach (City) is currently in the process of reviewing and updating its Urban Water Management Plan (UWMP) for the 2020 cycle. The City is also preparing a Water Shortage Contingency Plan (WSCP), a detailed proposal for the City’s actions in the event of a water shortage condition. The Department of Water Resources requires water suppliers to update their UWMP every five years. Among other things, the UWMP will evaluate current and projected water supplies and demands within the City’s service area over a 20-year planning horizon.

The City encourages local agencies, the public, and other interested parties in its service area to participate in the update process. If necessary, a stakeholder workshop may be scheduled in November 2021 to review the administrative draft. The City plans to make a copy of the draft 2020 UWMP and WSCP available for public review by October 2021. At that time, the plans will be available for review on the City’s website, https://www.grover.org/.

The City of Grover Beach will review and take action on the 2020 UWMP and WSCP at its December City Council Meeting on December 13, 2021 at 6:00 PM at the Council Chamber. Members of the public are welcome to attend. Thank you for your involvement with the City’s 2020 UWMP and WSCP. Please send comments to:

Robert Lepore, GISP
MKN & Associates, Inc.
(805) 904-6530
[email protected]
Sincerely,
Gregory A. Ray, PE
Public Works Director/City Engineer
Appendix D‐ Adoption Resolution