HomeMy WebLinkAbout2012-01-18 PACKET 08.C.REQUEST OF CITY COUNCIL ACTION COUNCIL AGENDA
MEETING ITEM #
DATE 1/18/12
PREPARED BY: Engineering Jennifer Levitt
ORIGINATING DEPARTMENT STAFF AUTHOR
COUNCIL ACTION REQUEST:
Receive the attached Air Monitoring Report.
STAFF RECOMMENDATION:
It is recommended the Council receive the attached Air Monitoring Report.
BUDGET IMPLICATION:
BUDGETED AMOUNT ACTUAL AMOUNT
ADVISORY COMMISSION ACTION
DATE REVIEWED
APPROVED DENIED
❑ PLANNING
F ❑ ❑
[:1 PUBLIC SAFETY
❑ ❑ ❑
❑ PUBLIC WORKS
❑ ❑ ❑
F PARKS AND RECREATION
❑ ❑ ❑
❑ HUMAN SERVICES/RIGHTS
❑ ❑ ❑
F ECONOMIC DEV. AUTHORITY
❑ ❑ F
0 ENVIRONMENTAL COMM. 1/11112_
E ❑ ❑
SUPPORTING DOCUMENTS:
F MEMO/LETTER:
F RESOLUTION:
❑ ORDINANCE:
❑ ENGINEERING RECOMMENDATION:
F LEGAL RECOMMENDATION:
E OTHER: SEH Technical Memorandum, Thomas A. Henning, PE, CHMM
ADMINISTRATORS COMMENTS:
City Administrator Date
COUNCIL ACTION TAKEN: EIAPPROVED F DENIED E]OTHER
H:\COUNCIL FORMS\Council 1-18-12\Council Action Form Air Monitoring Program.doc
A
SEH TECHNICAL MEMORANDUM
TO: Jennifer Levitt, PE, City of Cottage Grove
FROM: Thomas A. Henning, PE, CHMM
DATE: January 5, 2012
RE: Cottage Grove Ambient Air Monitoring - First Year (Baseline) Results
SEH No. 113702 30.0
1.0 Purpose
The City of Cottage Grove retained Short Elliott Hendrickson, Inc. (SEH) to conduct ambient air
monitoring at a location near the 3M Cottage Grove ( "3M ") facility. The purpose of the monitoring is to
measure annual concentrations of select metals and volatile organic compounds (VOC) near the
incinerator operated at the 3M facility. 3M has proposed to process non -3M generated wastes in the
incinerator. The monitoring is being conducted prior to this change to determine current conditions. The
monitoring is proposed to continue if 3M accepts non -3M generated wastes so that the impacts of the
change can be assessed.
SEH conducted the ambient monitoring for the 12 -month period from October 2010 through September
2011. This memorandum presents the results of the first twelve months of monitoring (October 2010
through September 2011). 3M did not accept non -3M generated wastes during this period, so these
results represent this "baseline" condition. Monitoring will be restarted if 3M begins accepting non -3M
generated wastes and may continue for one or two additional years.
2.0 Monitor Location Selection
SEH staff worked with 3M staff, representatives of the Minnesota Pollution Control Agency (MPCA) and
the City of Cottage Grove to select a location for the monitoring. The selected site is located northwest of
the incinerator stack on 3M property (inside the facility fence). The selected site met each of the
following site selection criteria:
1) Located on 3M property so access and security are provided
2) Power is accessible to the site
3) Provides acceptable distances from sources of background emissions (i.e. highways,
industrial facilities, etc.)
4) Location is in line with prevailing wind direction from the incinerator stack
5) The distance from the incinerator stack to the sampling location is approximately equal to the
distance from the incinerator stack to the nearest residence.
3.0 Methods
The sampling and analytical methods used where selected to match ambient monitoring methods used by
the MPCA at monitoring stations throughout the Twin Cities metropolitan area. This methodology was
used so that the results of the monitoring near the 3M facility can be compared to the MPCA's Twin
Cities metropolitan area monitoring data.
Short Elliott Hendrickson Inc., 3535 Vadnais Center Drive, St. Paul, MN 55110 -5196
SEH is an equal opportunity employer I www.sehine.com 1 651.490.2000 1 600.325.2055 1 651.490.2150 fax
Cottage Grove Ambient Air Monitoring - First Year (Baseline) Results
January 5, 2012
Page 2
In general, samples are collected every 12` day so that samples are collected on the same days that
sampling occurs for the MPCA monitoring. The twelve day sampling cycle ensures that over the course
of the sampling program, samples will be collected on each day of the week. Periodically, SEH collected
a sample on the 6` or 18 "' day to randomize the sample days.
A high volume sampler is used to collect 24 -hour total suspended particulate (TSP) samples. The sampler
turns on at midnight of the sampling day and blows ambient air across a filter for 24 hours. The filter is
analyzed for TSP and fifteen metals. At the same time, a summa canister with a regulator is used to
collect a 24 -hour sample that will be analyzed for individual VOCs. Collected samples are analyzed at
Pace Analytical Laboratory.
Filters used with the high volume sampler are prepared and processed according to the U.S.
Environmental Protection Agency (USEPA) Compendium Method I0-3.1 (USEPA, 1999) as applicable
for gravimetric determination. This method describes the numbering, pre -field tare weighing of filters,
and post -field final weighing of filters. Pre -field filters are conditioned in a room of constant humidity
and temperature and are gravimetrically tarred. After air samples have been collected, the filters are
returned to the laboratory and conditioned as before and weighed. Filter handling procedures found in
Appendix J of 40 CFR Part 50 will also be followed.
VOCs are collected and analyzed using EPA method TO -] 5 procedures. Six liter summa canisters
sanitized and place under vacuum at or greater to 25 inches mercury are used to collect the VOC samples.
Table 1 shows the monitoring program's analytical methods, sampling equipment, target metals and
individual VOCs.
Table 1. Methods and Equipment
Com ound
Test Method
Sampling Equipment
Total Particulates
EPA Method I0-3.1
Tisch TE -5170V
Metals'
EPA Method I0-3.4
Tisch TE -5170V
Volatile Organic
Compounds
EPA Method TO-15
Summa Canister with a Tisch
TE- 123flow controller
Notes:
Individual metals monitored include:
Antimony Cadmium Copper
Manganese
Arsenic Chromium Iron
Nickel
Beryllium Cobalt Lead
Selenium
2 Individual VOCs are listed on Tables 3 and 4.
SEH developed a quality assurance and quality control (QA /QC) program to help ensure monitoring
results are accurate and precise. QA /QC procedures include collecting field and method blanks, and
periodically splitting samples with the MPCA. These steps provide a check that contaminates are not
introduced during the sample collection, handling or analytical procedures.
Cottage Grove Ambient Air Monitoring - First Year (Baseline) Results
January 5, 2012
Page 3
4.0 Weather Conditions
Weather conditions for each sampling date are collected and recorded at the meteorological station
located at the 3M Cottage Grove facility. A broad range of data is collected at the station. On Table 2 we
provide a summary of wind speed and direction, temperature, and precipitation on the sampling days.
The raw meteorological data is included in Attachment A.
5.0 Results and Discussion
The results of the monitoring conducted from October 2010 through September 2011 at the Cottage
Grove monitoring site are shown on Table J. We show the results of each compound for each monitoring
day and the annual average concentrations. When a measured concentration was at or below the methods
detection limit we used the "estimated concentration" (if provided by the laboratory) or '/z the detection
limit, if no estimated concentration was provided.
5.1 Compounds Not Detected
A total of 54 VOCs and 12 metals were monitored throughout the year. Of this total, 29 VOCs and 2
metals (i.e. over half of the total) were not detected in any of the 27 samples. In addition, three additional
compounds were only detected in one of the 27 sampling events; and in each case, the concentration was
very near the detection limit. The compounds not detected are shown on Table 4.
Table 4. Compounds Not Detected in Samples
Compounds not Detected
Antimony
Dichlorobenzene (m)
Beryllium
Dichlorobenzene (o)
1,1,2,2- 'petrachloroethane
Dichlorobenzene (p)
1,1, 2,3,4,4- Hexachloro -1,3- butadiene
Dichlorotetrafluoroethane (Freon 114)
1,1,2- Trichloroethane
Ethyl Chloride
1,1- Dichloroethane
Ethylene Chloride
1, 1 -Dichloroethene
Ethylene Dibromide
1,2,4- trichlorobenzene
Methyl Bromide
1,2- Dichloropropane
Methyl Chloroform
1,3- Butadiene
Methyl tert -butyl Ether
Benzyl Chloride
Trans- l,2- dichloroethene
Bromodichloromethane
trans- l,3- dichloropropene
Chlorobenzene
Tribromomethane
cis -1,2- Dichloroethene
Trichlorofluoromethane
cis- 1,3- Dichloropropene
Vinyl Chloride
Dibromochloromethane
5.2 Comparison with Health Benchmarks and Ambient Standards
The monitoring shows that, for the compounds monitored, the air quality in Cottage Grove meets
Minnesota health benchmarks and state ambient air quality standards. Table 4 shows the average
monitored concentration for each compound and the associated state benchmark or state ambient
standard. The MPCA defines health benchmarks for ambient air on the MPCA website
(www.pca.state.mn.us / , click on the "Glossary" link):
Cottage Grove Ambient Air Monitoring - First Year (Baseline) Results
January 5, 2012
Page 4
A level of chemical concentration in ambient air, at or below which a chemical or defined mixture of
chemicals is not likely to cause an adverse health effect to the general public when exposure occurs
over a prescribed period of time.
5.3 Comparison with MPCA Monitoring Data
The first year's ambient monitoring results are generally comparable with background ambient air
concentrations measured throughout the Twin Cities (Note: The MPCA operates monitors located
throughout the Twin Cities and the State of Minnesota. The MPCA monitoring locations are shown on
Figure 1). The results of the monitoring conducted from October 2010 through September 2011 are
shown on Table 5. Care should be taken to not emphasize a single sample result because laboratory or
other errors can result in outliers that do not reflect actual ambient concentrations. A more relevant
assessment is an analysis of longer term trends and averages.
5.3.1 Particulate Matter
The average particulate matter (PM) concentration monitored at the Cottage Grove monitoring location is
lower than Minnesota's primary ambient air quality standard for PM. The monitored PM concentration
averaged 23.9 micrograms per cubic meter (ug/m at the Cottage Grove location while the ambient air
quality standard is 260 ug/m The average monitored concentration is also less than the average
concentration from the MPCA's Twin Cities monitoring locations, 28.9 ug /m
5.3.2 Metals
Monitored concentrations of metals are all below their respective health benchmarks. Several metals
including, antimony, arsenic, beryllium, cobalt and nickel, were infrequently detected and when detected,
concentrates were near their detection limits. Iron, copper, and chromium do not have health
benchmarks. Figures 2 through 4 show the results of lead, manganese and selenium monitoring at the
Cottage Grove monitor and compare the results with MPCA monitoring results.
5.3.3 Volatile Organic Compounds
Monitored average concentrations of VOCs are all below their respective health benchmarks. Several
VOCs were never measured above their detection limits (see Table 2). Six VOCs were consistently
detected at the Cottage Grove monitoring station: carbon disulfide, Freon 12, hexane, methyl chloride,
methyl ethyl ketone, and toluene. On Figures 5 through 11 we compare the concentrations of these seven
compounds with concentrations measured at other Twin Cities monitoring stations. All measurements are
below their respective health benchmarks.
Average concentrations of Freon 12, hexane, and methyl chloride are each near the average
concentrations monitored at the MPCA monitoring stations. The results of toluene and methyl ethyl
ketone are both dominated by a single high measured value. A concentration of 102 ug/m of methyl
ethyl ketone was measured on December 28, 2010 and 49.9 ug/m of toluene was measured on August 19,
2011. Both of these values are well below their respective health benchmarks. SEH contacted 3M to
team if an upset had occurred with the operation of the incinerator on either of these dates. The
incinerator and the incinerator's pollution control equipment operated normally on December 28, 2010.
On August 19, 2011, a failure of a water pump associated with the incinerator's scrubber caused an
automatic shutoff of the feed to the incinerator. This condition lasted about 30 minutes. During this time
the incinerator combustion temperature was maintained and all pollution control equipment remained
operational. It is unlikely that this condition caused an excess of toluene or any other organic compound
Cottage Grove Ambient Air Monitoring - First Year (Baseline) Results
January 5, 2012
Page 5
emissions because combustion temperatures were maintained in the incinerator. Further, monitored metal
concentrations are not elevated on August 19. Therefore, this condition likely did not cause excess metal
emissions.
We are evaluating potential sources of carbon disulfide in the area. The 3M plant is not expected to be a
significant source of carbon disulfide emissions. Carbon disulfide is commonly formed as a byproduct of
combustion of a fuel that contains significant quantities of sulfur. These fuels might be coal, residual or
unrefined oil, or a biogas such as landfill gas or digester gas.
Attachments:
MPCA Monitoring Locations
Table 2.
Weather Data for Cottage Grove Monitoring Station
Table 3.
Cottage Grove Monitoring Results
Table 5.
Comparison with Health Benchmarks
Figure I
MPCA Monitoring Locations
Figure 2
Total Suspended Particulates
Figure 3
Lead
Figure 4
Manganese
Figure 5
Selenium
Figure 6
Carbon Disulfide
Figure 7
Freon 12
Figure 8
Hexane
Figure 9
Methyl Chloride
Figure 10
Methyl Ethyl Ketone
Figure 11
Toluene
Appendix A. Meteorological Data
c: Katie Hill Brandt, SEH
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Table 2. Weather Data For Cottage Grove Monitoring Station
Source: 3M Weather Station
Date
Wind Direction
from"
Average Wind
Speed, mph
Range Wind
Speed, mph
Average Temp
degrees F
Precipitation
Inches
10/11/2010
SE
3.1
0.5 to 10.0
60
0.0
10/23/2010
E
5.3
1.9 to 14.1
55
0.0
11/412010
W
13.6
4.3 to 28.5
41
0.0
11/16/2010
S
6.9
3.0 to 13.2
33
0.0
12/4/2010
W
8.3
4.7 to 17.7
21
0.1
12/16/2010
SW
5.5
3.4 to 40.5
17
0.0
12/28/2010
SE
4.9
0 to 9.7
21
0.0
1/9/2011
E
4.0
0.5 to 267
2
0.0
1/21/2011
SE
4.6
0to14.0
-6
0.0
2/2/2011
W
10.6
1.6 to 30.1
2
0.0
2/14/2011
W
9.4
1.7 to 33.9
36
0.0
2/26/2011
S
4.3
2.0 to 34.2
1
0.1
3/1012011
W
7.1
0.6 to 14.7
29
0.0
3/22/2011
E
17.4
4.2 to 36.3
36
1.1
4/3/2011
SE
7.7
0 to 22.1
45
0.0
4/15/2011
E
171
5.5 to 35.7
40
0.1
5/612011
SW
3.5
0.7 to 11.6
55
0.0
5/21/2011
E
8.6
3.6 to 17.9
64
1.7
6/2/2011
E
10.5
2.2 to 22.0
1 64
0.0
6/17/2011
E
6.2
2.3 to 16.5
70
0.8
6/26/2011
SE
6.4
2.0 to 14.4
69
0.0
7/8/2011
SE
3.9
1.0 to 17.1
78
0.0
7/26/2011
E
6.6
1.7 to 13.1
74
0.0
8/19/2011
SW
6.5
2.0 to 20.1
70
0.0
9/9/2011
SE
4.2
0.7 to 14.9
70
0.0
9/18/2011
S
6.0
1.3 to 14.3
56
0.2
9/30/2011
W
10.8
1 4.6 to 21.0
1 53
0.0
A Wind direction based on average readings at the 3M Weather Station for each day of monitoring.
e Source: National Weather Service Weather Forcast Office, Daily Weather Observations for the Twin
Cities, MN ( http:// www. crh. noaa. gov /mpx/Climate /MSPClimate.php)
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