Morris Forman Wastewater Treatment Plant
Community Odor Survey Project

VERBAL DESCRIPTION

Week #79

The community odor survey was conducted in the afternoon of Friday, September 29, 2000. It was a sunny day with light winds generally out of the east at 0-4 mph. The temperature was about 70°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 5-7 parts per billion (ppb). No Zimpro odors from the MFWTP or industrial odors were detected at these stations but a very faint sewer odor was detected at station #3.

Non detectable to very faint odors were detected at the three (3) sampling stations (#6-#8) in the neighborhoods east and southeast of the plant. H₂S levels were 4-7 ppb. No MFWTP or industrial chemical odors were detected.

For the three (3) sampling stations (#9-#11) located south and southwest of the treatment plant in the more industrial areas of the City, the odor levels were non-detectable to faint. The H₂S concentration ranged from 5-7 ppb. Very faint industrial chemical odors were detected at station #10.

At the MFWTP, the wind was generally out of the east at 2-4 mph. The odor intensity at the seven (7) sampling stations around the plant ranged from non-detectable to strong. H₂S concentrations at these stations ranged from 6-150 ppb with the highest readings measured at station #12 where the average H₂S was 104 ppb. Both biotowers were in-service and both scrubbers were running. All recirculation fans at the towers were operating. The damper on the air line from the solids separator was still closed and air was venting out of an opening in the cover instead of being treated in the incinerator. There was a strong Zimpro/sludge odor on-site today but because the wind was out of the east the odor was not detected at the community survey stations.