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

Verbal Description

Survey #3 - Pre Zimpro shutdown

The community odor survey was conducted on the afternoon of Wednesday, October 10, 2001. It was a sunny day with wind generally out of the south 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 very faint to noticeable and the hydrogen sulfide (H2S) concentrations ranged from 4-6 parts per billion (ppb). A noticeable Zimpro odor from the MFWTP was detected at station #1 and noticeable industrial chemical odors were detectable at stations #2 and #3.

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 4-6 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 to strong. The H2S concentrations were 4-7 ppb. A strong industrial chemical odor was detectable at station #10 from Rubbertown.

At the MFWTP, there were light winds generally out of the south. The odor intensity at the seven (7) sampling stations around the plant ranged from faint to strong. H2S concentrations at these stations ranged from 0-55 ppb with the highest readings measured at station #16 where the average H2S was about 46 ppb. Both biotowers were in-service but scrubber "A" was down for repairs. All recirculation fans at the towers were operating. The portable incinerator was on standby operating mode 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.