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Home My WebLink About2007-05-29 Applicant Response Ltr to 05-24-07 NAC LtrMay 29, 2007 Northwest Associated Consultants, Inc Scott Richards, AICP 4800 Olson Memorial Hwy Ste 202 Golden Valley, MN 55422 763-231-2555 Civil Engineering Inc. 11285 Strang Line Road • Lenexa, KS 66215 913-310-0470 + 913-310-0261 fax RE: Lowe's of Oak Park Heights, MN Conditional Use Permit for Outdoor Storage Response to City Comments File No. 798.02-07.04 Dear Mr. Richards: Sincerely, 774e Scott McGee Regional Vice President Ozark Civil Engineering, Inc. CC: Eric Johnson; City of Oak Park Heights, MN David Sellergren; Fredrikson & Byron CORPORATE OFFICE 1008 NVV J Street, Suite C Bentonville, AR 72712 479-464-8850 479-464-9040 fax IC4 " • In response to your review comments dated May 24, 2007 we would like to offer the following comments and changes. Responses are in BOLD font. 1. The applicant shall identify the height of the trailers used to store the pallets and used appliances. The trailer height is 13' 0". 2. The applicant should provide photographs of the storage area, as well as views into the site from 58 Street and Nova Scotia. Photographs are attached. . For a previous approval, the applicant was to supply decibel verification for the back up generators. The decibel verification report and information are attached. We appreciate you and the staff's time during this review. Feel free to contact us for further clarifications or corrections as necessary. KANSAS REGIONAL OFFICE 11285 Strang Line Road Lenexa, KS 66215 913-310-0470 • 913-310-0261 fax SKAN5KA 316007 January 12, 2007 Mr. Eric Johnson City of oak Park Heights P.O. Box 2007 Oak Park Heights, MN 55082 Reference: Lowe's of Oak Part Heights MN Dear Eric: As the City has requested, a noise survey has been conducted at the recently constructed Lowe's Home Improvement store to measure the noise level created by the generator and trash compactor located at this site. Attached with this letter is the report dated January 8, 2007, prepared by Terracon, a local independent testing agency. Minnesota Pollution Control Agency Noise Pollution Control Standards were used in determining acceptable levels of compliance. The results of the sound testing found that the trash compactor is in full compliance with MPCA standards. However, the Generator exceeded noise standards at one monitoring point (east property line). Lowe's is currently pursuing options to reduce the noise levels to be within the MPCA guidelines. One of the options proposed by the generator manufacturer is a Level 1 sound housing enclosure, however, the lead time for design, fabrication and installation would be approximately 12 weeks. Several other options are also under consideration that would reduce the noise output. I expect Lowe's to finalize a sound reduction plan shortly and will send you an update as soon as this occurs. Feel free to give me a call with any questions or concerns you may have. Sincerely, Skanska USA Building Inc. Dan Bu Project Manager cc: Central File 1 Field Skanska USA Building Inc. 5250 Lovers Lane, Suite 200 Portage, MI 49002 Phone 269 342 5400 Fax 269 342 5799 Web www.skanskausa.com January 8., 2007 Jared Hawkinson Proiecq Menace( Estimator Ccns .Efectrical Construction ColConvergP,,nt Media 278 State Street St, Paul, MN 55107 Re: Letter Report of Noise Survey Lowe 5888 Nova. Scotia Avenue North Oak Park Heights, Minnesota 55082 Terra.con Project No, 41067051 Dear Mr, Hawkinson: Project fnformation Noise Survey Delivering Success for Clients and Em.ptoyees Sinc,-e 1965 More Than 80 Officts Nationwide Consulting Engineers & Scientists 3535 Hoffrnan Pire 65177O.1.5CO Fax ES wv Terracon Consultants, Inc (Terracon) has completed a noise survey at the above r site., The purpose of this letter is to present the results of the noise survey. Terra,on comple:ed a noise survey at the request of Collins Electrical Construction CodConvergent Media for an electrical generator and trash compactor located on the exterior of the Lowe store in Oak Park Heights, Minnesota. The noise survey was conducted in general ac. with the Minnesota Pollution .Control Agency (lAPCA) Noise Pc.Alution 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 a generator and trash compactor at a property a.djacent 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 ste order to select the most appropriate monitoring location. Based on a. te.eptione. 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 Terra.con representative selected two monitoring points on the property fine ,of the site. Point 1 was located near the southwest corner .ot the property approximately 175 feet west and 35 feet south of the trash compactor. Point 1 was selected for its proximity to the trash :compactor and - for its distance, from a barrier wall that has been er. on the southern property line_ Point 2 as iocated the eastern property line approximately 239 feet east and 59 feet south of the generator. Point 2 was selected for its proximity to the generator and an adjacent property to the east that wi eventually support town homes. A sketch of the site and the monitonno points is provided on Lowe's/Oak Park Heights, MN Noise Survey Project #41067051 January 8, 200$ the noise survey form attached. According to Minnesota Rules 7030.0050, the site has a Noise Area Classification (NAC) al 2 for 'retail trade facilities. Generator Monitoring Sound level measurements were taken using. a .Quest 1200 sound level meter equipped with a wind screen -attachment The sound Fey meter was set to the 'A" weighted scale used for measuring sounds within the range of human hearing and all 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 .catibration attachment. The calibration informa,tion was recorded on the attached noise survey form. For the background noise .several measurements were take over a. period of 10 minutes and averaged.. The background noise level was estimated at approximately 50. decibets (dBA)., Monitoring of the generator noise Level was conducted for one our monitoring points 1 and 2 from 1:30 pm to 3:30 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 reoorded on the manual monitoring data sheet .attached. A light breeze of approximately three to five mites per hour was observed from the north and the temperature was approximately Using the method described in the Noise Control Guidance, the 10 and 50' percentile noise levels (L.10 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 LIO (dBA) 57 73 L50 (dBA) 56 73 tiiionitoring Point 1 Monitoring Point 2 Trash Compactor Monitoring 2 L50 65 Noise Standard for - far 2 -1 L1O 70 •••••••••••••*,...,..........•••••••••••-•-•-•••••—. •■•••••,,,,•■••■•••rtwrcer lierracon The trash compactor was not monitored in the carne manner as the generator because it did not operate continuously. Terracon conducted measurements at monitoring points 1 and 2 while the trash compactor was operated once by itself and once while the generator was in operation.. In each case, the compactor operated for approximately one minute, v,rhich allowed Lowe's/ Oak Park Heights, MN Noise Survey Project #41067051 January 8, 2006 for six measurements. No change in sound level was observed at the monitoring points while the trash compactor was operated at the same time as the generator; therefore the ma.surements were not recorded. Table 2 'below lists the measurements made while only the trash compactor operated. Because the sound level measurements varied by less than one 07 during the compactor operation cycle at each monitoring point, only one measurement value is fisted. The sound levels measured are shown on the attached manual monitoring sheets, Table 2 — Trash Compactor Noise Conclusions Sincerely, TERRACON j n Unkefer, Ra Environmental Scientist JU/ Djw Location: Monitoring Point 1 Monitoring Point 2 3 Sound Level 54 52 lrerrazon The LI 0 and L50 values from Table 1 and the measurements .from Table 2 were compared to the noise standards in Minnesota Rules 7030.0040 for NAC 2. The measurements for the trash . compactor at points 1 and 2 listed in Table 2 .did not exceed either the LAO or the L50 standard, The L10 and L50 values estimated for the generator at point I did not exceed the NAC standards; however, both the LI 0 and L50 values .estimated for the generator at point 2 exceeded the NAC 2 standards (See Table 1). Minnesota Rule 70.3.0.0030 states that exrc. of noise standards for an NAC may not be violated upon establishment of land , use within the NAC. Based on the noise standard excec.4dances observed at point 2 during operation of the generator, noise abatement measures may be necessary depending on the application of noise standards by the local municipal authority. The City of Oak Park Heights should be consulted to determine if noise abatement measures should be implemented. 71. I r t.,„ ., .-----,--. 1 i., , i ..,..., , , ..yiv„ , ‘ ,,..,--,„,,,-__ / y \ David J Wolfgram .... ) Senior Engineer - SOURCE: MONITOR LOCATION: IN, 0 t NOISE SURVEY INVESTIGATOR: JNSTRUMENTATION: Qf tpo SIN Lox) I 16 DATE: TIME START: 154'," TINE END: 1573.$_. DIAGRA ilN.DICATE \( St SOURCE. 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