MPS Waste Audit Report
by
Andre Xiong
For a copy of this report or to access more information about waste management / recycling at MPS,
visit: http://mpsgoesgreen.mpls.k12.mn.us
School name and grade:
Today’s date:
Audit date:
Audit participants:
Transportation Center
6-11-2010
4-7-2010
Andre Xiong, Hennepin County Environmental Services
Orrin Schmidtbauer, Head Building Engineer
Bill Hill, MPS Plant Operations
ANALYSIS OF WASTE GENERATION AT YOUR SITE
Waste generated at your site in April, 2010:
 In April, your school produced 4,040 lb of waste.1
 Trash:
3,700 lb (92 %)
 Mixed recycling:
340 lb (8 %)
 Based on your school population of 217 staff, each person in your
school produced 18.6 pounds of waste during this month.2
 It took 6 dumpsters to haul your 3,700 lb of trash.3
 The waste you recycled in April will result in 340 less pounds of
material going to the incinerator as well as the production of new
materials from it. Making new products from recycled material is less
expensive and more environmentally friendly than making them from
raw materials.
MPS is now collecting
information about waste
and recycling rates by
school. The analysis
below is based on data
for the month which this
audit took place at your
site. To access weights
from other months,
please visit:
www.mpsgoesgreen.com and
click on ‘Green Reports’.
District cost of trash and recycling disposal for your site in April, 2010 6:
Monthly haul charge $1.90/yd
Processing fee rate
$/ton
Processing fee based on weight
MN State tax
17%
Hennepin Co. tax
14.5%
Trash, actual
$380
$43
$80
$13.52
$11.53
Total Cost
$485
Mixed Recycling
$23
$0
$0
exempt
exempt
$23
Trash,
had you not recycled
$380
$43
$87
$14.77
$12.59
$494
In April, your school diverted 340 lb of waste towards recycling; saving the district $10 in disposal fees that
would have incurred from adding that 340 lb to the trash instead. These savings allow the district to enhance
its resource management strategy and offer programs like organics recycling and improved mixed recycling.
Increasing your recycling rates would yield even higher savings throughout the school year.
ON-SITE AUDIT RESULTS & DISCUSSION
Included below are findings and recommendations based on the audit of your building’s
waste management practices.7
Organics Recycling:
You were not recycling organics in addition to mixed recycling.
Approximately 35% of a school building’s' waste is compostable. Recycling compostable waste saves the
district money from reduced hauling fees and taxes, helps the environment, and provides students an
educational, hands-on way to learn about environmental stewardship. If your school is interested in starting
an organics recycling program, there is an opportunity for additional schools to add an organics program in
fall, 2010. Start-up costs will be covered by a grant. For information about how to launch an organics
recycling program at your school, please visit: http://mpsgoesgreen.mpls.k12.mn.us/Organics_Recycling.html
Recycling and waste reduction practices:
You were using MPS Goes Green signage.
Congratulations on helping standardize the district-wide MPS Goes Green message. Remember that there are
informational signs in English, Spanish, Hmong and Somali available on the MPS website. Also, there are fun
‘What to Collect’ signs on the website that are appropriate for a K-8 audience.
None of the surveyed classrooms displayed posters and labels to aid in sorting.
Posters and labels help students and staff comply with the recycling program. Teachers, take as little as a
minute of your time to post up signage by recycling containers to encourage recycling in the classroom.
Labeling containers and displaying recycling information reduces contamination in the recycling containers.
Minimal effort is required to post up educational materials yet has major positive effects. Please check the
MPS website for a variety of informational signs you can use in classrooms. Another step you can take is to
incorporate environmental sustainability information into coursework. The MPS Goes Green website provides
curriculum materials you may find useful.
You often used color coding to promote sorting.
Congratulations on using the MPS-designated colors (blue = mixed recycling, green = organics recycling,
red/gray = trash) to promoting recycling and proper sorting. Note: Make sure to follow the designated color
scheme—many of your containers’ color did not correspond with their designated use—and cover up any
recycling labels on containers that do not correspond with its designated use. (i.e. recycling sign on a red
barrel). Contact your Plant Operations Supervisor for stickers that can be used for this purpose.
Interior containers:
All rooms sampled had recycling containers.
You often provided both trash and recycling containers at the same location.
Due to the large amount of recyclable material generated at a typical school building, placing recycling
containers wherever there are trash containers is an easy way to ensure that the right items go in the right
bins. Even if there is a recycling container in the same room or close by, individuals are likely to toss their
recyclables in the trash if the recycling container is not next to the trash. Making recycling convenient is
important to increasing recycling rates. The waste hauler’s single stream, no-sort recycling makes it even easier
and requires only one container for all recycling.
You were bagging mixed recycling containers
Congratulations on further reducing your site’s environmental impact by minimizing plastic bag use.
MPS’ waste hauler prefers recyclables un-bagged because the bags become a problem at the materials
recovery facility (MRF) where the recyclables are sorted and processed. At the MRF, in order to keep the
plastic bags from getting wrapped around the sorting equipment, they must be separated and disposed. The
plastic bags do not get recycled. Furthermore, the recyclables can easily be contained and transported through
the use of bins, dumpsters, and trucks. Keep up this environmentally friendly, cost effective practice.
Exterior dumpsters:
All dumpsters were labeled.
Congratulations for labeling the different dumpsters to distinguish what waste type goes in them, ensuring
that trash and recyclables are disposed of properly.
Waste [were/were not] correctly disposed of in their corresponding dumpster.
*Not sufficient data. Note: Disposing of your waste streams in the proper dumpsters is the crucial final step
your waste takes before it leaves your school property. If you end up putting sorted materials (mixed
recycling and/or organics) in the trash dumpster, -- or contaminate sorted materials with trash, it undermines
the entire recycling effort and can be very discouraging for all of the staff, students, and parents who
participate in the recycling program.
Your dumpsters were not effectively arranged to encourage recycling.
It is a best practice to place recycling dumpsters in a convenient location. Placing the recycling dumpster(s)
closer than trash dumpster discourages recyclables from ending up in the trash dumpster. If your school is
participating in organics, it is especially important to put that dumpster close due to the heavy weight of those
bags. If you would like to move your dumpster location or arrangement, please contact your Plant Operations
supervisor.
Your trash dumpsters [one at 4 yd3 and one at 6 yd3, each picked up 5x weekly ] are typically full at pick-up.
If you have not already, consider incorporating organics recycling or other waste reduction strategies to reduce
the amount of trash rather than increasing dumpster size to accommodate increasing trash.
Your mixed recycling dumpster [ 3 yd3, picked up 1x weekly ] is typically full at pick-up.
Congratulations for filling your mixed recycling dumpster to near its capacity. Dumpster disposal fees are
charged based on size and service frequency, so an underutilized dumpster costs the district extra money.
Increasing capacity or service frequency is perfectly fine if your school’s recycling efforts have improved that
much.
Summary of Recommendations
-Incorporating organics recycling will significantly reduce trash by diverting food waste (including the countless
milk cartons, now-compostable trays, and paper towels) into its own dumpster to be converted into compost
rather than buried or incinerated as trash.
-Notify Plant Operations supervisor to rearrange dumpsters to promote recycling and proper disposal by
placing all dumpsters in one central location rather than in different locations.
- Reduce trash service by Improving recycling—nearly 100% of your total waste is trash, much of that is
recyclable.
If your school needs to modify its hauling schedule / dumpster size or access additional materials to make your
waste management/recycling program successful, please contact your Plant Operations Supervisor. For
questions regarding the audit and audit report, please contact Andre Xiong.
Andre Xiong
MN GreenCorps School Waste Prevention Specialist
Hennepin County Dept. of Environmental Services
417 N. 5th Street, Minneapolis, MN 55401
phone: 612-543-1316
email: andre.x.xiong@co.hennepin.mn.us
Appendix / Sources
1 Monthly waste generation data was provided by MPS contract hauler, Allied Waste Services. Data on
dumpster sizes and hauling schedules were also obtained from Allied.
2 Student enrollment numbers were obtained through MPS student account, available to the public online.
Staff enrollment numbers were obtained through payroll.
3 Allied Waste estimates one cubic yard of trash weighs approximately 100 lbs.
4 Ginny Black, from MN Pollution Control Agency, estimates approximately 50% of organic waste remains as
finished compost after decomposition.
5 It was decided upon to use 32% as the figure for organic waste composition of total waste generated at
schools. The study was conducted in southern California by California Integrated Waste Management Board
for 2002.
6 Calculations:
Monthly haul charge = [ $1.90 X dumpster size (yd 3) X frequency of pickup in a week ] X 4 weeks (month)
Processing fee = processing rate X weight (tons)
Total cost = monthly haul charge + processing fee + tax
Savings incurred from recycling = total cost (gross weight) ▬ total cost (trash weight)
7 Audit procedures:
o Audits were scheduled for 1 hour and included:
1. Interview with head building engineer 2. Interior walkthrough
3. Contamination assessment
4. Exterior walkthrough
o Audits were conducted by Hennepin County Environmental Services’ GreenCorps member; alongside an
Allied Waste representative and the Plant Ops supervisor for that site.
o Questions during audit were answered based on head engineers’ observations and perceptions.
o Walk-through portion of audit consisted of observing (as needed):
2 hallways (or other common areas)
3 classrooms
1 bathroom
Cafeteria
Dumpsters
o Contamination assessment portion of audit consisted of visually assessing:
2 bags of trash
2 bags of mixed recycling
2 bags of organic waste
8 Not all schools were able to supply samples for contamination assessment due to various reasons. In such
cases, samples were attained in these other manners (where possible):
Observing bags already disposed of in dumpsters
Observing un-bagged waste in dumpsters equivalent to bag
Observing active containers on the floor
Clarification on contaminants:
Non-recyclable paper include: food-soiled paper, napkins, paperware, milk cartons.
Non-recyclable plastics include: shrinkwrap, plasticware, food containers.
Cardboard is allowed in single stream collection, so it is categorized with ‘paper’ for our purposes.
Food waste is only considered a contaminant in trash where organics recycling is in place.