7.3. SR 08-03-2015 - Laserfiche WebLink

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after additional sound buffering work had been done. The decibel readings from both visits are outlined in the attached tables. The noise level inside of the building on both visits was near 120 dB,which is comparable to a jet plane taking off or a rock concert. Directly outside the vehicle testing garage door the sound dropped to a level comparable to a lawnmower, a reduction of approximately 25 dB. Along the west property line,nearest the residential neighborhoods the base reading (without dyno operation) ranged between 50 and 70 dB depending on traffic along Highway 10. The peak readings when operating the dyno ranged between 62 and 70 dB. Noise readings were also taken near Jerry's fence along the north property line with a base measurement of 60 dB and a max of 79dB when the dyno was running. The increase in noise near Jerry's property is due to the way the sound is directed east and towards the highway. All of these tests were completed with the doors to the dyno cell closed. Staff also measured the sound levels at two additional locations,independent of the dynos operation. At the east side of the property,nearest the highway, noise levels ranged between 80 and 85 dB. This was taken over a length of time to account for the variety of vehicles using the highway. Finally, the sound was measured while a vehicle was driven from the tuning portion of the facility to the dyno cell. The vehicle was not driven above an idle and was measured at 83 dB. During the course of testing noise around the property the most significant impact along the west property line occurred when the vehicle was driven around for testing. There is no way to move the vehicle inside of the building, and the vehicle did not go above idle. As this location is not buffered, the noise travels very easily. The decibel reading was near that of a passing diesel truck. Soil Testing Staff has been working with the Minnesota Pollution Control Agency and soil samples will be taken on July 1, 2015, and the results are expected before the July 6, 2015, City Council meeting. If the tests show a cause for concern the MPCA will investigate further. Staff also conducted a site visit on June 30, 2015, to identify any potentially hazardous waste,but nothing definitive was observed. Additionally,in working with the MPCA it was noted that the Hazardous Waste License for HiTech is expired and currently listed as inactive. HiTech identifies themselves as a"non-generator" for hazardous waste. The MPCA is investigating their permit concerns further. Financial Impact None Attachments ■ City Council Packet dated June 15, 2015 ■ Noise Reading Tables ■ Noise Reading Location Map ■ Decibel Chart N:APublic Bodies\Agenda Packets\07-06-2015\Final\x7.1 sr HiTech revocation.docx