Morris Forman Wastewater Treatment Plant
Community Odor Survey Project
(WEA Project #266-04)

Verbal Description

Survey #10 - Post  Zimpro shutdown

The community odor survey was conducted on the afternoon of Thursday, January 17, 2002. It was an overcast day with light winds at 0-4 mph generally out of the north. The temperature was about 34°F.

For the five (5) ambient sampling locations (#1-#5) in the neighborhoods north and northeast of the treatment plant, along the Dumesnil St. corridor, the odor intensities were non-detectable to very faint and the hydrogen sulfide (H2S) concentrations ranged from 0-4 parts per billion (ppb). No odors from local industries or the MFWTP were detectable at these stations today.

Very faint odors were detected at the three (3) sampling stations (#6-#8) in the neighborhoods east and southeast of the plant. No MFWTP odors were detected but a very faint detergent odor was detected at station #7. H2S levels were 7-8 ppb at these stations.

For the three (3) sampling stations (#9-#11) located south and southwest of the treatment plant in the more industrial areas of the City, a very faint industrial chemical odor was detected at station #9. No MFWTP odors were detected. The H2S concentrations were 0-6 ppb.

At the MFWTP, there were light winds at 0-4 mph generally out of the north. The odor intensity at the seven (7) sampling stations around the plant ranged from nondetectable to strong. H2S concentrations at these stations ranged from 2-60 ppb with the highest readings measured at station #17 where the average H2S was about 52 ppb. Both biotowers were in service and both scrubber fans were in operation. The new stationary incinerator appeared to be operating normally. Zimpro was out of service. The contractor for the ASP project is in the process of removing the cover for the solids separator and removing equipment from the decant tanks. These activities may be temporarily releasing some odors. One dryer is in the startup phase and is being run a few hours each day. Starting January 21, 2002 the contractor hopes to run one dryer 8 hrs/day. Dryer was not running at time of this survey.

The APCD called MSD on this day and reported an odor in the community. Mr. Sam Bate of the APCD and Norm Robinson of MSD surveyed the community and found a very faint, intermittent odor, possibly from the MFWTP on Bells Lane east of station #10. This odor was not detected during this survey.

Odor surveys will be conducted an average of once every two weeks during this project and will be conducted through August, 2002.