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

Verbal Description

Survey #18 - Post  Zimpro shutdown

The community odor survey was conducted on the afternoon of Friday, May 24, 2002. It was a mostly sunny day but hazy with winds generally out of the southwest to southwest at 2-7 mph. The temperature was about 78°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 5-11 parts per billion (ppb). However, at station #3, there was a strong and pungent industrial odor noticeable at this location.

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 8-12 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 strong at station #11 and noticeable at station #10. The H2S concentrations were 8-10 ppb. All along Bell's Lane, there was a sharp and pungent industrial odor.

At the MFWTP, there were winds at 4-7 mph but somewhat swirling general out of the southwest and west. The odor intensity at the seven (7) sampling stations around the plant ranged from faint to noticeable. H2S concentrations at these stations ranged from 7-80 ppb with the highest readings measured at station #17 where the average H2S was about 39 ppb. The same sharp and pungent odor was detected at station #17 as detected along Bell's Lane and as detected at station #3 in the community. 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 but odor levels at the plant were noticeable today from two sources, the primaries and the dryer sludge product.

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