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

Verbal Description

Survey #1 - Pre Zimpro shutdown

The community odor survey was conducted on the afternoon of Friday, September 14, 2001. It was a sunny day with wind generally out of the northeast at 3-9 miles per hour. 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 noticeable and the hydrogen sulfide (H2S) concentrations ranged from 1-4 parts per billion (ppb). No Zimpro odors from the MFWTP were detected at these stations but a noticeable sewer odor was detected at station #3.

Very faint to faint odors were detected at the three (3) sampling stations (#6-#8) in the neighborhoods east and southeast of the plant. H2S levels were 0-1 ppb at these stations. A fishy odor was detected at one station.

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 0-4 ppb. A faint industrial chemical odor was detectable at station #9 and a noticeable Zimpro odor was detected at station #11.

At the MFWTP, there were stiff winds generally out of the northeast. The odor intensity at the seven (7) sampling stations around the plant ranged from faint to strong. H2S concentrations at these stations ranged from 2-130 ppb with the highest readings measured at stations #17 and #18 where the average H2S was about 50 ppb. Both biotowers were in-service and both scrubbers were running. All recirculation fans at the towers were operating. The portable incinerator was on standby operating today. The existing stationary incinerator (PTO) was operating normally.

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