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Home My WebLink About2007-07-19 Terracon Noise Survey ReportJuly 19, 2007 Jared Hawkinson Project Manager 1 Estimator Collins Electrical Construction Co./Convergent Media 278 State Street St. Paul, MN 55107 Re: Letter Report of Noise Survey Lowe's 5888 Nova Scotia Avenue North Oak Park Heights, Minnesota 55082 Terracon Project No. 41077727 Dear Mr. Hawkinson: Project Information Noise Survey 1rerracon Consulting Engineers & Scientists 3535 Hoffman Road East White Bear Lake, Minnesota 55110-5376 Phone 651.770.1500 Fax 651.770.1657 www.terracon.com ; 1,-DLCe F ( a )I1) 1 6- lir Terracon Consultants, Inc. (Terracon) has completed a noise survey at the above referenced site. The purpose of this letter is to present the results of the noise survey. Terracon completed a noise survey at the request of Collins Electrical Construction Co./Convergent Media for an electrical generator located on the exterior of the Lowe's store in Oak Park Heights, Minnesota. The noise survey was conducted for the generator in order to evaluate the effectiveness of a noise abatement enclosure that had been installed around the generator. The noise survey was conducted in general accordance with the Minnesota Pollution Control Agency (MPCA) Noise Pollution Control Standards as set forth in Minnesota Rules Chapter 7030 and A Guide to Noise Control in Minnesota issued by the MPCA and dated March 1999 (Noise Control Guidance). The purpose of the survey was to measure the noise level created by the generator at a property adjacent and east of the site where residential town homes are to be constructed. A Terracon representative conducted a brief survey of the properties adjacent to the site in order to select the most appropriate monitoring location. Based on a telephone conversation with Eric Johnson of the City of Oak Park Heights, the monitoring locations were limited to points on the site property itself and not on adjacent properties. The Terracon representative selected two monitoring points on the property line of the site. Point 1 was located on the eastern property line approximately 239 feet east and 59 feet south of the generator and Point 2 was located approximately 239 feet directly east of the generator. Points 1 and 2 were selected for their proximity to the generator and an adjacent property to the east that will eventually support tovshontdsAFiettElieg VAg tong AineriMitoring points is provided on More Than 90 Offices Nationwide Lowe's I Oak Park Heights, MN Noise Survey Project #41077727 July 19, 2007 the noise survey form attached. According to Minnesota Rules 7030.0050, the site has a Noise Area Classification (NAC) of 2 for retail trade facilities. Sound level measurements were taken using a Quest 1800 sound level meter equipped with a wind screen attachment. The sound level meter was set to the "A" weighted scale used for measuring sounds within the range of human hearing and measurements were taken using the "FAST" response setting. The sound level meter was mounted on a tripod at a height of approximately 3.5 feet above the ground surface. Prior to conducting measurements, the sound level meter was calibrated using a calibration attachment. The calibration information was recorded on the attached noise survey form. For the background noise level, several measurements were taken over a period of 10 minutes and averaged. The background noise level was estimated at approximately 48 decibels (dBA). Generator Monitoring Monitoring of the generator noise level was conducted for one hour at monitoring points 1 and 2 from 12:30 pm to 2 :30 pm. A sound level reading was made every 10 seconds during the hour for a total of 360 readings for each monitoring point. The sound levels were recorded on the manual monitoring data sheet attached. A light breeze of approximately five miles per hour was observed from the north and the temperature was approximately 80°F. Using the method described in the Noise Control Guidance, the 10 and 50 percentile noise levels (L10 and L50, respectively) were estimated using the results recorded on the attached manual monitoring data sheets. The L10 and L50 for the generator at monitoring points and the noise standard for the NAC are listed below in Table 1. Table 1 - Generator Noise Location Monitoring Point 1 Monitoring Point 2 ; 2007.41077727'detter reporl.dcc L10 a� sit 61 54 L50 dBA 61 2 54 L50 65 70 ]rrrrocron Noise Standard for NAC 2 L10 Lowe's 1 Oak Park Heights, MN Noise Survey Project #41077727 July 19, 2007 Conclusions The L10 and L50 values from Table 1 were compared to the noise standards in Minnesota Rules 7030.0040 for NAC 2. The L10 and L50 values estimated for the generator at Points 1 and 2 did not exceed the NAC 2 standards. Based on the noise level measurements collected on July 16, 2007, the noise abatement enclosure that has been installed on the generator appears to be effective. General Comments This noise survey was conducted in a manner consistent with the level of care and skill ordinarily exercised by members of the profession currently practicing under similar conditions in the same locale. The information contained in this report is relevant to the date and site conditions during which this survey was conducted. Actual site conditions may vary. This report has been prepared on behalf of and exclusively for use by Collins Electrical Construction Co./Convergent Media for specific application to their project as discussed. This report is not a bidding document. Contractors or consultants reviewing this report must draw their own conclusions regarding the quantities of materials reported. Terracon does not warrant the work of regulatory agencies or other third parties supplying information which may have been used in the preparation of this report. No warranty, express or implied is made. Sincerely, TERRACON CONSULTANTS, INC. son Unkefer, P.G. David J. Wolfgram, P.E. Environmental Scientist JU/DJW/djw NAProjects\2007V11077727Vetter report.doc 3 Senior Engineer lierracon ,N44- IN VESTICiATOR: INSTRUMENTATION: ( MOO SIN (4, SOURCE,: 6nAe MONITOR LOCATION: 1)IAGRAM 'INDICATE - NOISE SOURCE. NOIS li RFC:FIVER, NlICROPI IONE LOCATION, RITLELFING OBJECTS/013STRUCTIONS AND DIST:\NCES.) te4 I ( i •' t r : : 04 l .44 t-% RESULTS: „)1 T AA NOISE SURVEY It U kVie () o 2, ri ( P) L10 1 6 TIME START: WC TIME END: 4 DATE: : f1/610 : 1 - c). e Meteoroiogical Conditions Wind Speed 1 Direction mph/ . TEMPERATURE: CALIBRATION CALIBRATOR SERIAL NUMBER:0,rEuxvicALIBR:vrioN FRFQI TNCY:(0001/ RNA' h eti (Hi ct. r. 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