The document describes two small-scale composting systems - one at a community garden in Los Angeles and one proposed for New York City. The LA garden uses a windrow process, receiving browns from local arborists and greens from community partners. Material is layered and turned regularly as it moves through the active and curing phases. The proposed NYC site would be a medium-scale operation under 1,000 cubic yards per year. It would use three phases - mixing, mesophilic, and curing - located in separate zones to minimize odor impact on nearby residences. Core equipment would include a vertical auger mixer, skid steer, and Gore cover.

1. Small-Scale Compost Systems

2. What is small-scale in California?
Excluded tier:
• No more than 100cy of compostable material on site at any given time
• No more than 750sf
• Vermiculture is excluded at any scale, considered agriculture
750
square
feet

3. Elysian Valley Community Garden Northeast LA
Browns storage
~20cy
Active Windrow
~5cy
Curing pile
~5cy
3-bin and worm-bin

5. Windrow Process: Receiving
• Browns are delivered by local arborists
• 10cy of browns per month
• Greens are delivered in bins by community partners, LA Kitchen
• 6,200lbs per month of greens

6. Windrow Process: Layering
• Bottom layer is always browns, 4-6 inches deep
• Green layers 2-3 inches deep, spread evenly
• Top layer is always browns plus unscreened cured compost if available

7. Windrow Process: Turning
Material Flow
New
Old
• Material flows in one direction
• Prevents raw material mixing with older material
• One continous pile reduces footprint
• Curing pile is detached and monitored separately

8. Windrow Process: Cover + Monitor

9. Community Managed Hub
epm
“IN”
“COOK” “CURE”
Material Flow
Community
drop-off
Community
garden
• Each bin is 1cy volume
• 1cy of mixed material weighs 800-900lbs
• “In-box” fills up in 2-3 weeks
• Occasionally light on browns (drop-off participants forget to add browns)

10. Community Managed Hub

11. Build-it-Green!Compost
Site Location
06/05/2013
BIG!Compost site
location.
Queensboro
Bridge
(overhead)
Queens
Plaza
South
(at
grade)
Subway
tunnels
(below
grade)
41st
Rd
Medium Scale in NYC
Registration tier:
• Less than 1,000cy/year of food scraps
• Grey area...What’s the bulk density of food scraps? 1,200lbs?
• 1,000cy x 1,200lbs = 1.2 million pounds = 600 tons

12. Build-it-Green!Compost
Site Inventory
Scale 1”=20’ North
06/05/2013
Notes:
Agreed site boundaries with DPR.
Approximately 12,000 SF.
Existing guard-rail
Existing storage container
for Land Restoration
Project (LRP)
Existing concrete blocks;
unknown owner
Bridge edge line overhead

13. Build-it-Green!Compost
Proposed Operational Zones
Scale 1”=40’
06/05/2013
Notes:
Site rests between >100’ to over
200’ from closest residential
building.
Closest residential
building
Phase 1 (mixing;
active stage)
Phase 2 (mesophilic
stage)
Phase 3 (curing
stage; sifting)
~100’
~150’
~200’

14. Build-it-Green!Compost
Operation Layout
Scale 1”=20’ North
06/05/2013
Notes:
Mixing and active composting
to be located furthest from
residential neighbors in Zone 1.
Receiving and
mixing hoop house
Phase 2; material
arrives at this
face after it has
been harvested
from Phase 1
Phase 3 curing and
sifting
Sifting space,
kept clear
Plant buffer
Proposed storage
container
Product storage
Existing concrete
blocks relocated
in planting buffer
Contact signage
Zone1Zone2Zone3
Leaf silos; carbon
storage
Phase 1; all
incoming material
is added to leading
face
Aeration manifold
pipes

15. Site Condition Before Registration

16. Registered Facility

17. Core Equipment
• Vertical Auger Mixer (Jay-Lor)
• Skid-steer (Case 430)
• Gore cover (Sustainable Generation)