South Portland/Portland VOC Canister Sampling Results
Page last updated: January 14, 2020 11:07 AM
Graphic Charts of Grab Sampling Canister Results
Please NOTE: The graphic charts visualizing the grouping of the aliphatic compound results now include our improved approach for summarizing and displaying this data.
Of the 72 total grab sample canisters made available for this phase, 56 had valid results, 13 did not and 3 canisters (ME09254, ME09357, ME09358) were not returned. The valid samples are listed in the table to the right. Click on the "Sample ID" for any date / location to see the graphic visualization of the results. The 13 invalid samples were due to the following reasons:
- Citizens reported that three canisters (ME09226, ME09217, ME09388) did not have available vacuum to collect a sample. Most likely, these canisters leaked during shipment.
- Three other canisters (ME09323, ME09305, ME09322) did not collect an adequate amount of sample air needed for the laboratory's analytical system to run a valid analysis.
- The remaining six canisters (ME09229, ME09231, ME09232, ME09233, ME09234, ME09235) are void due to laboratory error. The canisters were not pumped down before shipment to South Portland therefore it was not possible to collect a valid sample of ambient air.
- The last sample (ME09421) was returned to the laboratory past it's valid holding time and was therefore not analyzed.
Many canisters were returned without noting the location (street name) where the sample was taken. Maine DEP has reviewed the chain of custody tags and has been able to determine the location for most. Please contact us if this information is not correct or if you have more information to add.
Click on the location map below and scroll through "zoomed-in" versions, one for each South Portland district. The larger scale maps allow us to better depict spatially where a grab sample was taken within each district. While no grab samples were taken in Portland, a zoomed-in map of their 24-hour stationary sampling sites area is provided to help show the proximity of them to the South Portland grab sample locations.
CAUTION to grab sampling data users: It is not appropriate to use grab sample data for any comparison to longer term average (e.g. annual) levels, guidelines or standards for health assessment purposes. Staff from the Maine Center for Disease Control (CDC) gave a presentation to the South Portland City Council on November 26, 2019 that describes and illustrates their approach to interpreting this data from a health perspective. The grab sample data charts we’ve created here are intended to simply be a visualization of each sample’s results from an air quality perspective, comparing them to the 2018 annual averages from our Portland Deering Oaks site, which for this purpose are being used as reference or background concentrations for the area.
For more information, contact Danielle Twomey (207) 592-3951.
|8/11/2019||Bug Light Park||ME09345|
Graphic Charts of 24-Hour Average Canister Results
|June & July 2019||SP Assessors Office||SPAssess_JuneJuly2019|
|June & July 2019||Po Deering Oaks||PDO_JuneJuly2019|
|August 2019||SP Assessors Office||SPAssess_Aug2019|
|August 2019||SP Bug Light||SPBugLight_Aug2019|
|August 2019||Po Deering Oaks||PDO_Aug2019|
|September 2019||SP Assessors Office||SPAssess_Sep2019|
|September 2019||SP Bug Light||SPBugLight_Sep2019|
|Sept/October 2019||SP School Admin||SPSchoolAdmin_SepOct2019|
|September 2019||Po Deering Oaks||PDO_Sep2019|
|October 2019||SP Assessors Office||SPAssess_Oct2019|
|October 2019||SP Bug Light||SPBugLight_Oct2019|
|October 2019||SP High School||SPHS_Oct2019|
|October 2019||SP Redbank CC||SPRedbankCC_Oct2019|
|October 2019||Po Deering Oaks||PDO_Oct2019|
|November 2019||SP Assessors Office||SPAssess_Nov2019|
|November 2019||SP Bug Light||SPBugLight_Nov2019|
|November 2019||SP High School||SPHS_Nov2019|
|November 2019||SP Redbank CC||SPRedbankCC_Nov2019|
|November 2019||SP School Admin||SPSchoolAdmin_Nov2019|
|November 2019||Po Deering Oaks||PDO_Nov2019|
|November 2019||Po Ocean Gateway||POG_Nov2019|
|November 2019||Po West Commercial||PWC_Nov2019|
Excel Spreadsheet of All Canister Numerical Data
Data collected by the project is available in an Excel spreadsheet file containing both the grab sampling and 24-hour average data.
Please NOTE: The January 13, 2020 update to the Excel data file contains a grab sample that had been missed in previous data updates, the latest results (through the last sample date in November 2019) from all of the South Portland fixed 24-hour sampling sites, and the addition of the two newest fixed 24-hour sampling sites in Portland. We anticipate December 2019 data will be made available around the first of February 2020.