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

Verbal Description

Survey #6 - Pre Zimpro shutdown

The community odor survey was conducted on the morning of Tuesday, November 21, 2001. It was a sunny day with almost no wind but it was generally out of the south. The temperature was about 32°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 noticeable and the hydrogen sulfide (H2S) concentrations ranged from 3-7 parts per billion (ppb). No Zimpro odors from the MFWTP were detected at any of these stations but a noticeable industrial chemical odor was detected at two of the stations.

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. No MFWTP odors were detected. H2S levels were 3-7 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 odor levels were very faint at stations #9 and #11 but a strong odor was detected at station #10. The H2S concentrations were 3-5 ppb.

At the MFWTP, there was a very light wind out of the south that could not be measured by the weather station. The odor intensity at the seven (7) sampling stations around the plant ranged from faint to very strong. H2S concentrations at these stations ranged from 2-59 ppb with the highest readings measured at station #14 where the average H2S was about 37 ppb. Both biotowers were in service but scrubber "A" was out of service. The portable incinerator was on standby operating mode today. The existing stationary incinerator (PTO) appeared to be operating normally. The oxygen ionization system for the DAFT room in the main equipment building was started on October 26, 2001 and was operating today.

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