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LESSONS LEARNEDPLANNING FOR

TRASH CAPTURE DEVICES

Curt KrugerStorm Water Consultant

CONTECH Engineered Solutions


• 10 Years Hands-On Trash Capture

• Dozens of Large Trash Systems

• Every Bay Area County

• SFEP Grant Program

• Demonstration Project - Honolulu

Curt KrugerStorm Water Consultant

CONTECH Engineered Systems


Track 1

• Identify High Trash Areas

• 100% of >5mm Trash

• 1 year - 1 hour storm

• State List of Approved Devices

OR

Track 2

• Provide Equivalent


Schedule

• Early 2017 – Declare Track 1 or 2

• 2017 – Planning

• 2018 – 10% Coverage suggested

• 2019 – 2027 – add 10%/yr


• My City has no $$

• I have no staff for planning

RESULT

1. 11th Hour Actions

2. Cost More to Buy/Install

3. Higher Maintenance Costs

4. Lost Funding Opportunities


• #1 Concept for Today:

CAPITAL

IMPROVEMENT

PROJECT


STEP 1

Program Scope (10% design)

• What Area is included?

• Zoning Map

• Known Adjustments

• Estimate Costs

• Large Devices

• Small Devices


$0

$2,000

$4,000

$6,000

$8,000

$10,000

$12,000

0 100 200 300 400 500 600 700 800 900installed min installed max

Installed Cost per Acre

Large Trash Capture Device


STEP 1


• What Area is included?• Zoning Map

• Known Adjustments

• Estimate Costs• Large Devices – Total Acres x $1,600/acre

• Reduce for small pockets

• Annual - $1800/yr per device

• Small Devices – Count inlets x $1000

• Annual - $500 per device


STEP 1


State Estimate:

$4,500 - $11,500 per acre


TRACK 1 (Devices)

Capital Improvement Project

Annual Maintenance

Defined Scope and Costs

TRACK 2 (Other ??)

Develop Alternatives

Submit to RWQCB – Negotiate Approval

Implement Program

Monitor – Adjust Program


Monitor

Monitor


Monitor


Large Trash Capture Devices

CDS

(Vortex) Outfall Net

Direct Screening


Large Devices: MS4 trunk lines

Capital Improvement Project


Small Trash Capture Devices

Connector

Screen

5 mm

openings

Inlet

Screen


Small Trash Capture Devices

ARS – Automatic Retractable Screen

NOT Full Capture

Trash Excluder

Pretreatment for CPS

Reduces Maint $$


Large DevicesPros• Large Coverage

• Dry Season maint.

• Low maint $$

• Lowest total $$

• No repairs

Cons

• Planning

• High First $$

• Engineering $$

• Not for all Sites

Small DevicesPros• Minimal Engineering

• Low First $$

• Use Anywhere

Cons

• Maint 2-4 times/yr

• Wet weather maint

• Higher total $$

• Damage/Repair


Comparison: 1 Large System

OR

117 Catch

Basin Inserts


1 Large System

•$350k

•$1500/yr

117 Inserts

•$100k

•$300 x 3 x 117

= $41,067/yr

15 year cost

$372,500

15 year cost

$716,000


San Jose Trash Removal Evaluation


Decision Point

Track 1 or Track 2

If Track 1

• Large Devices (mostly)

OR

• Small Devices (only)


Selecting and Prioritizing Sites

Next Step – Get to the Details

1. Locate every outfall

2. Identify drainages

3. Enter size (acres)

4. Overlay land use.



1. Outfalls



1. Outfalls

2. Drainages



1. Outfalls

2. Drainages

B 29 acres

C 3

D 15

E 22

F 23

G 139

H 23

I 352

JK 335

L 54

N 332



Office Steps – Part 2 $$$

For Each Candidate Site:

1. Preliminary Sizing of Device

a. Trash Capture Flow Rate

b. Peak Flow Rate

2. Estimated Device Cost

3. Estimated Installed Cost.





2. Estimated Device Cost

Use per acre cost

OR

Direct Bid from Manufacturer





3. Estimated Installed Cost.

In house estimates

Contractor Estimates

Large units:

• Installed with other construction: +50%

• Stand alone: +1-3 times device cost



Field Steps

1. Visit candidate sites

2. Close to Outfall

3. Utility Manhole covers

4. Maintenance access

5. Constructability


Site Considerations

What We’ve Learned

Kevin KashiProject Manager, Engineer

City of Oakland


Watersheds smaller than 40 acres (in-line unit)

5’ to 8’ diameter vortex unit

• Pipe influence zone is normally clear of utilities

• Quick installation

• Hydraulic surcharge is normally within tolerance

• Minor standard shoring requirementsKevin Kashi, P.E. City of Oakland Project

Manager/Engineer

Low hanging fruit project site


Kevin Kashi, P.E. City of Oakland Project

Manager/Engineer

Relatively low hanging

fruit project site

Watersheds 40 to 100 acres

(off-line unit)

Fewer utility conflicts

Adequate right of way

Drainage system that meets

the design storm

Depth of cover

Stable & low permeable soil

Low ground water

Maintenance & record

keeping


high hanging fruit

project site


Manager/Engineer

http://weldpro.tk/images/SafetyNet.jpg

http://weldpro.tk/images/SafetyNet.jpg


Watersheds larger than 100 Acres (size of separator)

Utility conflicts

Limited right of way

Shallow cover , downstream/upstream flow restrictions

Unstable soil & high ground water

Maintenance & record keeping


Manager/Engineer


Be flexible on the time of delivery as issues will

come-up

Stay firm on the budget and deliverables

Take active role in moving the project forward

Resolve issues quickly & Make prudent decisions

with the design team

Get maintenance involved … at the beginning


Manager/Engineer

Dream big with a safety net and hire design professionals


Case History

Trash Capture

Dublin, CA

Mark LanderCity Engineer

City of Dublin

Village Parkway Project

16 catch basin filter inserts installed under

SFEP ARRA grant; 10 filters added with

City’s Used Oil Payment Program grant

funds (City receives approximately $8,000

per year from CalRecycle)

Inserts serviced by manufacturer 3 times a

year (using UOPP funds)

October/November

February/March

May/June

Village Parkway Project (cont)

Filters serviced on April 13, 2010

Removed 142.5 gallons of debris materials Wet weight: 1,280 lbs./Dry weight: 513 lbs.

Captured debris 85% organic materials: leaves, pine needles, landscape debris &

sediments; and

15% trash debris: plastic wrapping material, cups, plastic bags,

packing material, cigarette butts, plastic straws & aluminum cans


Maintenance


Maintenance

• Involve Maintenance Team

• Consider Vac truck position

• Access to Sanitary M/H


Construction Tips

• Identify Staging Area

• Meet the Neighbors (Schools)

• Consider Effect of Shoring

• Design – Build


Time To Attack

the Trash

Problem Is:

NOW

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