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david be~ b associatas, incoepoeatad 1313 5th street s.e.. suite 322 · minneapolis. mn. 55414 . telephone: 612-331-4571 3 June 1993 MEMORANDUM TO: Michael Falk City of Roseville FROM: David Braslau RE: Noise Measurements on TH 36 at Reiling Residence Noise measurements were made at the Roger/Gladys Reiling residence (1877 Glueck Lane North) in Roseville on wednesday, 2 June 1993. Readings were col- lected with a Larson-Davis 700 meter and transferred into a computer for plot- ting. Skies were partly cloudy, temperature 64 degrees, with light winds so that the data should accurately represent noise from TH 36. The meter was set up 3S' in from the property line adjacent to TH36. Five plots are attached. Exhibit 1 Five-minute readings of L01, L10, LSO, L90 Exhibit 2 Five-minute readings of Lmin and Lmax Exhibit 3 Hourly averages of L01, L10, LSO, L90 Exhibit 4 Hourly L10 averages compared with MPCA L10 standard Exhibit S Hourly LSO averages compared with MPCA LSO standard Only the L10 and LSO levels are covered by state standards. The others are provided for information only. It can be seen in (Exhibit 2) that the minimum level never dropped below 60 dBA during the measurement period. The "bottom line" can be seen in Exhibit 4 and Exhibit 5. It can be seen that the L10 (level exceeded 6 minutes of an hour) is generally 8 dBA over the MPCA L10 standard of 65 dBA for this time period (Exhibit 4). It can also be seen that the LSO (level exceeded for 30 minutes of an hour) is generally 12 dBA over the MPCA LSO standard of 60 dBA. Normally an exceedance of 10 dBA is con- sidered a significant impact. Please let me know if you have any questions on the attached plots and if you would like any further explanations of the data. We would be happy to assist you in investigating methods for helping to mitigate these levels. th360603.mem w883