Manufactured Treatment Devices

Pilot Update2014

Types of MTDs?

HydrodynamicSeparators

Car t r idgeF i l te rs

B iofi l t ra t ionIn a Box

TrashCapture

Why MTDs?

• Small footprint

• Retrofit opportunities

• Less costly

• Simple maintenance routine

• Reduced system maintenance

Déjà vu?

• “Traps” installed in early ‘90s• 16 routes/170 inlets proposed• 3 routes/~80 inlets remain

• Renewed focus in downtown Shoal & Waller creeks◦ Lower Shoal Seaholm Redevelopment District◦ Waller Creek District Surface Improvements

• Watershed Capital Projects◦ Lower Shoal Stream Restoration $4M◦ Lower Shoal WQ Retrofit $500k◦ Waller Tunnel & Improvements $149M◦ Waller WQ Retrofit $2.5M

• Lower Shoal PER

Background

Bio C leanIn le t Basket

Bio Clean Inlet Basket

Pilot

• One year• 7 locations• 6 week schedule• Data collected

o Timeo Weight

In service…

6th @ Trinity

Barton Springs

@ S. 1st

Vermiculture?

A helping of leaves with your trash

Ick-factor

Findings

17 Traps 17 Baskets# minutes per route 30 272# visits per year 52 12# of crew per visit 4 2manhours per year 104 109full time equivalent (FTE) .05 .052

labor cost/ yr @ $19.28/hr $

2005 $

2098lbs collected per year 1326 4284

$/lb collected $

1.51 $

0.49

Field ops data

6th street trap route

Extrapolated

pilot data

Pilot Report