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

Verbal Description

Survey #8 - Post  Zimpro shutdown

The community odor survey was conducted on the afternoon of Wednesday, December 19, 2001. It was a partly cloudy day with winds at 3-10 mph generally out of the southwest. The temperature was about 50°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 faint and the hydrogen sulfide (H2S) concentrations ranged from 0-4 parts per billion (ppb). A very faint sludge odor from the MFWTP was detected at station #2 which was directly downwind of the plant today.

Non-detectable to noticeable 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 but a noticeable industrial chemical odor was detected at stations #6 and #7. H2S levels were 0-6 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 non-detectable at stations #9 and #11 but a very faint industrial chemical odor was detected at station #10. The H2S concentrations were 0-7 ppb.

At the MFWTP, there were stiff winds at 3-14 mph generally out of the west. The odor intensity at the seven (7) sampling stations around the plant ranged from faint to strong. H2S concentrations at these stations ranged from 3-19 ppb with the highest readings measured at station #16 where the average H2S was about 17 ppb. Both biotowers were in service and both scrubbers were in operation. The portable incinerator was on standby operating mode today. The existing stationary incinerator (PTO) appeared to be operating normally. Zimpro was out of service. The plant is currently dewatering sludge, mixing it with sawdust if necessary and hauling to the landfill. The new dryers and RTO's are not in service yet.

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