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Limited Microbial Evaluation ATC Project No. 22.25172.0003 Roseville Fire Station Building November 17, 2006 Roseville, Minnesota Page 2 reported that water associated with snowmelt and rainwater had caused water to penetrate into the basement on a number of occasions during the last year. He also advised that the site had had the roof replaced in 2005. The services requested of Mr. Dolan were to conduct limited mold aerosol -+,wr �Ivdm ei*%A 1: *4% 1 A I 1^ 4% +min L% lywr p, 4, ti, V Y Ill V (411%4 0�a-[IIF11116 LQ a331-,33 UIV, 111U1U "I Lllk-� all a3 LIIL3 ""a LJ%-I%wvlllv Flvaa%d%A Y IL, 3, volunteer personnel who occupy the Fire Station Building. The fire personnel occupy the engine garages, dispatch office, Chief and staff offices, day room, bathroom and shower area, and the conference room. The city employees temporarily occupy the meeting room and kitchenette to the southwest and the Historical Society volunteers have temporary occupation of the offices to the northwest of the Fire Station Building. OBSERVATIONS Mr. Bissen of ATC conducted the site visit on November 9, 2006, Moisture meter readings were collected using a Delmhorst BD-2100TMMoisture Test Meter. The following visual observations were made during the evaluation: • ATC did observe suspected microbial growth on the water damaged ceiling tiles in the stairwell leading to the basement • ATC did observe potential minor mold growth on the walls of the basement in the southwest corner, below the old widow basin and sill. • ATC did observe odors in the basement consistent with sewer gases. ATC also observed dry floor drains, urinal traps and suspected a number of vent/ traps that were potentially dry but not observable due to their location. • ATC did observe an exhaust pipe from the water heater located in the generator room, which was connected to the chimney along the south wall of the basement. The chimney displayed or in 1 ganic. matter such a bird nesting material in the access, which was observed to be without the cover. • ATC did observe efflorescence associated with the concrete block walls below the windows of the west side of the Fire Station Building. • During the visual inspection no unusual odors were detected in the Day Room, bath and shower area of the Fire Fighter's area. Moisture meter readings collected from walls and flooring throughout the Fire Station identified readings of less than 1% moisture, which were considered acceptable. AIR SAMPLING AND RESULTS ArFO -Fr%" +r%+nl iqlklpA *"^IA 4% +1ka P;,ra rX I %_1 U1%J"%WL %a%J1 a"ti-FuL116 LVt L,%JL,"i yukiLl- V JL"V]L%j 111%JJL%4 3F%JJL %a Jul tjuv & 11L L x5xxvvit 0 Room, basement and hallway of the Historical Society, as well as outdoors for comparison to the natural environment. Ziefon Air-O-Celle microbial spore trap cassettes were used to collect samples of airborne non-viable spores for 10 minutes at a flow rate of 15 liters per minute. The flow rate of the vacuum pump was calibrated prior to and following each sample collection. The air samples were submitted to Hygel'a Laboratories, Inc. in Stafford, Texas for analysis. of predominant mold taxa and estimated concentrations. C- 20 925v4