MORRIS FORMAN WASTEWATER TREATMENT PLANT

COMMUNITY ODOR SURVEY PROJECT

VERBAL DESCRIPTION

Week #36-Survey A

The community odor survey was conducted in the mid-morning of Monday, November 29, 1999. It was a sunny day with winds generally out of the northwest, but shifting frequently and ranging from 1-5 miles per hour. The temperature was about 46°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 intensity ranged from no odor to very faint and the hydrogen sulfide (H2S) concentrations ranged from 2 to 5 parts per billion (ppb). No MFWTP or industrial odors were detected at any of these stations. Monitoring station #5 was located at the intersection of Colmar Drive and Rosewell Avenue.

Very faint to noticeable odors were recorded at the three (3) sampling stations (#6-#8) in the neighborhoods east and southeast of the plant and the H2S levels ranged from 3-5 ppb. Monitoring station #6 (relocated from Stratton Avenue to the intersection of Southern Avenue and Hazel Street) had a noticeable raw sewage odor. The odor was coming from one or more of several catch basins in this area. An industrial odor was detected at station #8.

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 intensity was non-detectable to faint. The H2S concentration was generally 4-5 ppb. Zimpro was detected at station #10.

At the MFWTP the wind was generally out of the north. The odor intensity at the seven (7) sampling stations around the plant ranged from non-detectable to strong. H2S concentrations at these stations were in the range of 2-13 ppb with the highest readings measured at station #18 near the west biotower. Zimpro odor was detected at station #18 on this day. Three Zimpro units were on-line and MSD has stopped feeding primary effluent to the towers. The biotowers were recirculating water. All biotower ventilation fans were running. The media and stone has been removed from Biofilter #1 in preparation for installation of new media.