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

Verbal Description

Survey #5 - Pre Zimpro shutdown

The community odor survey was conducted on the afternoon of Wednesday, November 14, 2001. It was a partly sunny day with light winds out of the west and southwest. The temperature was about 68°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 strong and the hydrogen sulfide (H2S) concentrations ranged from 2-6 parts per billion (ppb). Zimpro odors from the MFWTP were detected at three of these stations and throughout the community north and northeast of the plant.

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 1-6 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 to noticeable. The H2S concentrations were 4-7 ppb. A noticeable soapy, sweet odor was detectable at station #10.

At the MFWTP, the wind was shifting directions at 3-4 mph. The odor intensity at the seven (7) sampling stations around the plant ranged from very faint to noticeable. H2S concentrations at these stations ranged from 5-54 ppb with the highest readings measured at station #15 where the average H2S was about 47 ppb. The portable incinerator was on standby operating mode today and people were working on the existing stationary incinerator (PTO). 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.