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

Verbal Description

Survey #12 - Post  Zimpro shutdown

The community odor survey was conducted on the afternoon of Monday, February 25, 2002. It was an overcast day with steady winds at 3-9 mph generally out of the southwest. The temperature was about 60°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 2-8 parts per billion (ppb). A very faint sludge odor was detected at stations #1 and #3 and a faint industrial chemical odor was detected at station #4.

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 but a faint exhaust odor was detected at station #8. H2S levels were 6-10 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, a very faint industrial chemical odor was detected at stations #9 and #11 and a noticeable industrial chemical odor was detected at station #10. No MFWTP odors were detected. The H2S concentration was 6 ppb at all three stations.

At the MFWTP, there were steady winds at 2-7 mph generally out of the southwest. The odor intensity at the seven (7) sampling stations around the plant ranged from nondetectable to strong. H2S concentrations at these stations ranged from 7-23 ppb with the highest readings measured at station #18 where the average H2S was about 21 ppb. Both biotowers were in service and both scrubber fans were in operation. The new stationary incinerator was operating normally. Zimpro was out of service. The contractor for the ASP project is in the process of removing the cover for the solids separator and removing equipment from the decant tanks. One dryer and RTO train was in service during the survey. This train is being operated about 16 hours per day. The 2nd train is scheduled to go on line in about 6 weeks.

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