STORMWATER COMPLIANCE CIP MASTER PLAN &LA CIENEGA PARK & FRANK FENTON FIELD

REGIONAL STORMWATER PROJECT

August 8, 2019

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Identify additional Stormwater project opportunities for EWMP compliance

Develop project concepts

Develop Overall Plan to capture 87 acre-ft of stormwater runoff during the 85th percentile 24-hr storm event Rain fall intensity of 1.1 in/hr. for the region

Budget and prioritize CIP projects, 20-year planning horizon

STORMWATER COMLIANCE CIP MASTER PLAN OBJECTIVES

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SUMMARY OF STORMWATER COMPLIANCE CIP MASTER PLAN

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Key Data for Public Land Existing Land Use, Topography, Surface

Drainage Stormwater Infrastructure Soil Survey Data 2016 Roadway Condition Assessment

Report

Process identified distributed sites providing over 83 acre-ft potential stormwater capture

Site Visits provided confirmation for each type

BMP DEVELOPMENT PROCESS

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Curb Extensions

Median Bioretention Permeable Pavement

Sidewalk

Vaults

Residential Programs

Subsurface Storage

BMP CONCEPTS FOR STORMWATER CAPTURE

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Prioritization Objectives• Maximize Stormwater Volume Capture• Coordinate with City Projects to

Minimize Disturbance• Reduce Access Issues by utilizing City

owned properties• Proximity to Stormwater Infrastructure

reduces additional infrastructure needs

Future Prioritization Opportunities• Complete Streets Plan (CIP No. 0100)• Water Main and Hydrant Replacement

Plan (CIP No. 0387)• Land Acquisition (CIP No. 0647)• Street Tree Removal (CIP No. 0089)• Alley Repaving (CIP No. 0080)• Stormwater Rehab Program (No. 0260)

PRIORITIZATION OF PROJECT SITES

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EWMP Cost Development2016 EWMP Cost Functions were used to establish planning level costs. These were developed by refining 2011 LACFCD Watershed Management Modeling System (WMMS) cost functions

CIP Cost DevelopmentTypical Project Bid Tabs developed for each project category, providing:

• More detailed assessment of project components

• Project costs informed by current dollars

• Average unit costs for Los Angeles area

• Vendor costs obtained for specific items.

• Construction Contingency of 30%• Additional 20% for Planning and

Design

2016 Ballona Creek EWMP Cost Functions

2019 Stormwater CIP: BMP Facility Refined Costs

REFINING COST OPINIONS

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UPDATED COST COMARISON

Already Planned via

City-adopted Ordinances 2015

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UPDATED COST COMARISON

TOTAL CAPITAL COST (2016): $71.95M TOTAL PLANNED CAPITAL COST(2019): 110M

TOTAL EXISTING PROJECT COST: $10.5M

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CIP PROJECT SUMMARIES

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CIP IMPLEMENTATION TIMELINE Informed by Design Professionals, Estimators,

Proprietary Device Suppliers, Contractors Year 1 - Planning, Design, Permitting Costs Year 2 – Construction Replacement or restoration considered post-CIP Public outreach and engagement should be

integrated throughout planning, design, and construction phases.

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CIP IMPLEMENTATION SUMMARY

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This CIP provides capture and

treatment of an additional 72.4acre-ft of stormwater runoff, during

each storm event greater than or

equal to 1.1 inches, the 85th

percentile storm event.

Approximately 840 acres of

impervious drainage area will be

treated through various

structural and non-structural

BMP and LID strategies, ensuring

EWMP compliance.

STORMWATER CAPITAL IMPROVEMENT PROGRAM IMPACT

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Already Planned via

City-adopted Ordinances 2015

PRELIMINARY DESIGN

REPORT

LA CIENEGA PARK & FRANK FENTON FIELD STORMWATER PROJECT

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Evaluate Feasibility of Enhanced Watershed Management Plan (EWMP) Recommended Project

Develop and evaluate feasible Project Alternatives

Identify Recommended Project Alternative and Develop Preliminary Design

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LA CIENEGA PARK

FRANK FENTON FIELD

PRELIMINARY DESIGN REPORT OBJECTIVES

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Project Criteria EWMP Recommendations

Capture Volume Goal 24 acre-feet

City Watershed Contribution

City of LA significant contributor

BMP Type Groundwater Infiltration/Recharge

Site Layout Requirement

Use of all baseball fields

Project Cost $32.2m

OVERVIEW OF EMWP RECOMMENDED PROJECT

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County Requirements for Stormwater Infiltration projects include: Infiltration rate >.3 inches per hour Invert of stormwater infiltration >10’ above

groundwater Infiltration shall not increase potential for

seismic settlement due to liquefaction Infiltration shall not increase potential

settlement of structures on or adjacent to site

Results of hydrogeological investigations: Site infiltration rate: .01 inches per hour Site soils: interbedded granular soils subject to

liquefaction

UPDATED HYDROGEOLOGICAL INVESTIGATION RESULTS

Geotechnical and Hydrogeological Investigations Indicate Infiltration is Not Feasible

Alternative Options Include:

Harvesting and Direct use at the Park

Treatment and Discharge back to the MS4

Diversion to the Sanitary Sewer

Requires detaining stormwater volume for 24 hours after storm event.

No treatment required.

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PROJECT ALTERNATIVES

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UPDATED HYDROLOGY ASSESMENT

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CATEGORY EWMP RECOMMENDATIONS UPDATED RECOMMENDATIONS

Capture Volume Goal 24 acre-feet 21 acre-feet

City Watershed Contribution City of LA significant contributor City of Beverly Hills main contributor

BMP Type Groundwater Infiltration/Recharge

Subsurface Detention and Diversion to Sanitary Sewer

Site Layout Requirement Use of all baseball fields Use of one baseball field

Project Cost $32.2m $20.2m

SUMMARY OF FEASIBILITY STUDY

• Stormwater diversion, storage, and release to LASAN’s sanitary sewer system

• Detain stormwater volume for 24 hours after storm event

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ALTERNATIVE COST COST PER GALLON

DETAINED

COMPARISON BETWEEN ALTERNATIVES

Alternative 1 – Modular Precast

Detention Tank

$20.2 million $2.96 Gravity flow to detention tank results in less pumps /

O&M

High excavation volumes

Lowest cost

Alternative 2- Prestressed

Concrete Detention Tank

$25.6 million $3.74 More pumps / O&M required to pump to detention

tank

Less excavation volumes

Alternative 3 - Cast-In-Place

Concrete Detention Tank

$37.6 million $5.49 Less pumps / O&M

High excavation requirements

High concrete requirements

Highest cost

RECOMMENDED PROJECT ALTERNATIVE

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ALTERNATIVE 1 – MODULAR PRECAST DETENTION TANK

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PRELIMINARY ENGINEERINGDESIGN

PARAMETER VALUE

Maximum Flow into Tank,

cubic feet per second

14

Capacity, MG 6.84

Tank Invert Elevation, feet 105

Tank Height, feet 15

Tank Foundation To Be Determined by Basin

Manufacturer

Tank Footprint, feet 276 x 243

Inlet/Outlet Pipe Diameter,

inches

48

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DESCRIPTION TOTAL DIRECT COSTTOTAL INDIRECT

COST

TOTAL

CONSTRUCTION

COST

Division 1 $109,000 $46,000 $154,000

Safety Equipment $109,000 $46,000 $154,000

Division 2 $4,702,000 $1,926,000 $6,627,000

Site Preparation $1,265,000 $519,000 $1,782,000

Earthwork $3,034,000 $1,243,000 $4,276,000

Buried Piping $134,000 $56,000 $188,000

Site Improvements and Amenities $170,000 $72,000 $240,000

Dewatering $100,000 $43,000 $141,000

Division 3 $4,406,000 $1,804,000 $6,209,000

Precast Concrete $4,406,000 $1,804,000 $6,209,000

Division 11 $683,000 $281,000 $963,000

Water Supply & Treatment Pumps $683,000 $281,000 $963,000

Total Construction Cost $13,953,000

Construction Contingency (30%) $4,186,000

Construction Management (5%) $698,000

Planning and Design Cost (10%) $1,396,000

Total Estimated Project Cost $20,233,000

Direct Cost Labor Equipment Sub-Contractor

Indirect Cost General

Requirements Contractor Fee Insurances & Bond

PROJECT OPINION OF PROBABLE COST

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PROJECT FEATURE ACTIVITY1 FREQUENCY ANNUAL O&M COST

Stormwater Diversion Structure Inspect diversion structure, remove gross

solids with a vacuum truck

Annually $9,600

Trash Rack Remove gross solids with a vacuum truck Monthly & After Rain Events $28,800

Detention Tank Inspect interior of tank After Rain Events $24,000

Detention Tank Clean interior of tank with a vacuum truck Bi-Annually $9,600

Pump Station Electrical power Daily low flow diversion,

assumed 10 storm events

$3,700

Pump Station Inspect and maintain pumps including

lubrication and cleaning

Monthly $14,400

Pump Station Remove gross solids from sump with a vacuum

truck

As Needed $9,600

Pump Station Inspect and maintain instrumentation and

controls

As Needed $4,800

Pump Station Replacement parts As Needed $20,500

Total Estimated Annual O&M Cost $125,000

30 Year Total Life Cycle O&M Cost2 $6,400,0001Assumes City will contract out maintenance activities with labor cost of $150 per hour230-Year Life Cycle O&M Cost based on 3% O&M inflation, 5% annual energy increase

OPERATIONS AND MAINTENANCE COST

City Stormwater Enterprise Fund

(SEF)

Stormwater User Fees

Cash FinancingPotential Funding

Safe Clean Water Program

(Measure W)

General Obligation Bond/ Revenue Bond Financing

Clean Water State Revolving Fund Loans (CWSRF)

Water Infrastructure Finance and

Innovation Act (WIFIA)

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FUNDING STRATEGIES

Municipal tax-exempt bonds

20 or 30-year amortization period

Interest rate 4.5% to 5% or higher

Federal-state partnership

20-year amortization period

Low-cost financing

Interest Rate 1.7% to 2.0%

Administered by the EPA

35-year amortization period

Funds 49% of the total cost

Interest Rate 3% plus, equal to or greater than the Treasury rate as of the date of closing

Municipal Program(40% = 560K)

Regional Program (50% = 700K)

County of LA(10% = 140K Admin)

Insufficient over the years

City can’t raise fee without going to ballot, Prop 218

Transfers-in from the City’s General Fund once City Council approves CIP or due to new regulations

Cash financing from General Fund

No debt-financing

Prop 1 via Stormwater Program

Caltrans Stormwater Grant

CURRENT BEVERLY HILLS FUNDING

$20.2M for LCP/FFF Project, recommendation is “Project Financing Mix”

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PROJECT SCHEDULE

WORK ITEM MONTHS YEAR 1 YEAR 2 YEAR 3 YEAR 4

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1

Complete Preliminary

Design (Finalize PDR)3

CEQA Documentation,

Permits10

Complete Final Design /

Deliver Bid Set4

Bid Phase4

Construction Phase18

Public Outreach 36

Total36