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

Verbal Description

Survey #16 - Post  Zimpro shutdown

The community odor survey was conducted on the afternoon of Friday, May 10, 2002. It was a partly sunny day with shifting winds at 0-3 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 very faint to faint and the hydrogen sulfide (H2S) concentrations ranged from 5-10 parts per billion (ppb). No MFWTP odors were detected.

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. There were no MFWTP or industrial odors noticeable at these stations today. H2S levels were 6-8 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, the industrial chemical odor level was very faint at station #11 but otherwise there were no industrial or MFWTP odors at these stations. The H2S concentrations were 6-9 ppb.

At the MFWTP, there were intermittent winds at 0-8 mph. The odor intensity at the seven (7) sampling stations around the plant ranged from non-detectable to noticeable. H2S concentrations at these stations ranged from 7-26 ppb with the highest readings measured at station #17 where the average H2S was about 23 ppb. Both biotowers were in service and both scrubbers were in operation. The new stationary incinerator (PTO) appeared to be operating normally. Zimpro was out of service. Two dryers and RTO's were operating at the time of the survey and odor levels in the community and at the plant were low today.

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