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8.d) SBP Associates Inc - Zavoral Noise Monitoring Report - 1 15 14SBP ASSOCIATES, INC. PO Box 16557 St. Louis Park, MN 55416 Phone: 95 2-920-1500 January 15, 2014 Kristina Handt Administrator, City of Scandia 14727 209th Street North Scandia, MN 55073 Dear Ms. Handt: Re: Zavoral Mine Noise Monitoring Results SBP Associates, Inc (SBP) was contracted by the City of Scandia to conduct noise monitoring near the Zavoral mine to determine compliance with the Minnesota Noise Rules. This letter presents the results of this noise monitoring study. Noise Descriptors and Minnesota Noise Rules Minnesota has noise standards that are designed to be consistent with sleep, speech, annoyance, and hearing conservation requirements for receivers within areas grouped according to land use activities. The Minnesota standards are as follows: 7:00 AM to 10:00 PM 10:00 PM to 7:00 AM I-io L50 Ljo L50 NAC -1 (Residential) 65 60 55 50 NAC -2 (Commercial) 70 65 70 65 NAC -3 (Industrial) 80 75 80 75 L10 means the sound level which is exceeded for 10 percent of the time for a one-hour period. L50 means the sound level which is exceeded 50 percent of the time for a one- hour period. Sound levels are expressed in dBA. A dBA is a unit of sound level expressed in decibels and weighted for the purpose of approximating the human response to sound. The impact of the Zavoral mine noise on a residential area is limited by the NAC -1 values. Noise Monitoring Locations Monitoring locations were chosen to represent sensitive receptors around the mine site perimeter. The monitoring locations are shown in the figure in Attachment A. Sites 1 and 3 are north of the mine site, Site 2 is south of the mine site, Site 4 is southwest of the site entrance and Site 5 is Southeast of the mine site towards the St. Croix River. Results Summary The following table presents a summary of the results of the monitoring. Monitoring was conducted on December 18, 2013. Zavoral Mine Operations 12/18/13 Noise Monitoring Results Test Site Test Start Time L10 (Limit is 65 dBA) L50 (Limit is 60 dBA) 1 10:29 am 49.5 45.5 2 11:55 am 46.5 41.0 1 1:10 pm 47.0 42.5 3 1:47 pm 48.0 43.5 4 3:14 pm 52.0 47.0 5 4:26 pm 43.5 35.5 Noise levels were within the State Standards at each of the monitored locations. Complete monitoring results are provided in Attachment B. Test Equipment Testing was conducted with a Type 1 CEL Model 593 analyzer. The analyzer was field calibrated prior to and after each test period. Testing was conducted according to MPCA rules. Detailed Monitoring Results Site 1 Test 1 —10:29 am -11:29 am Test Result L10 = 49.5 dBA, L50 = 45.5 dBA This site is on the property adjacent to the southern termination of Quarry Avenue North. Noise source noted at this site were occasional truck noise from Highway 95 and noise from a variable breeze through the trees. Mine noise was not apparent. Test 2 —1:10 pm to 1:32 pm Test Result L10 = 47.0 dBA, L50 = 42.5 dBA The second test at this site was terminated early to move to a monitoring location (Site 3) closer to the mine. Site 2 11:55 am —12:55 am Test Result L10 = 46.5 dBA, LS0 = 41.0 dBA This site is along Quinell Road. South Wins of 5-10 mph with occasional stronger gusts were noted. Mine noise was not audible during this test period. Traffic noise from Highway 95 was noted. Site 3 1: 47 pm — 2: 47 pm Test Result L10 = 48.0 dBA, LS0 = 43.5 dBA This site is near a cabin/home just south of the mine property. Noise from the mine area was intermittently apparent, with levels generally in the 40 — 45 dBA range. Occasional "hammering" noise was noted with levels in the 53 — 56 dBA range. Winds were calm during the testing. Site 4 3:14 — 4:14 pm Test Result L10 = 52.0 dBA, L50 = 4 7. 0 dBA This site is a home/farm west of Highway 95 and southwest of the mine entrance. South winds of 5 mph were noted. Traffic noise from Highway 95 was present and was the dominate noise source during the testing. Noise from the mine operations was intermittently noted when traffic noise was not present. 50 haul trucks were noted either entering or leaving the site during the test period. Noise from the trucks was audible (45 — 46 dBA) as they accelerated when leaving the site or when crossing Highway 95 to enter the site. Site 5 4:26 pm - 4:52 pm Test Result L10 = 43.5 dBA, L50 = 35.5 dBA This site was near the northern termination of Quint Avenue, southeast of the mine site. Winds were calm during the testing. Noise from the direction of the mine was barely apparent at times during the testing. Winds were calm. Noise from a snow plow on 205th Street/Quint Avenue was present during part of the testing. The test was terminated early due to the snow plow operations and because noise from the mine was no longer apparent. All monitoring results are in compliance with the State of Minnesota noise rules. Thank you for the opportunity to work with the City of Scandia on this project, and please feel free to contact me with any questions you may have regarding this noise monitoring study. Sincerely, Stephen B. Platisha, P.E. Attachment A Zavoral Mine Noise Monitoring Locations Asite 1 ite 2 4 Site 3 Site 5 Attachment B Zavoral Mine Noise Monitoring Data CEL Instruments Ltd. Start 18 -DEC -13 End 18 -DEC -13 Length 0 days Mic Free Field Records CEL 593.C1R v 7.21 ------ 18� 30 Mode -/- ENV A001 tri• : � 11 1 . a 4 01:00:03 200v OFF Period 5 minutes 12 DEADER T LAST CAL 18 -DEC -13 START 18-DEc-13 10:5"2:30 =ND 18 -DEC -13 11:522:33 _ENGTH 0 DAYS 01:00:03 TIMED RECS 12 PER 5min 1IC=FF 200u=OFF TYPE=1 T OL 0.0 % L R SPLFMRX ,dB 77.4 70.1 io .. SPLFMIN ,dB 50.$ 3$.4 so'. LEQ , dB 59.1 46.8 LnF95.0%,0 54.5 41.5 dB :. . LnF99. 0%, dB 53.5 40.0 dB :. . IB- FLR LINPEAK ,dB $4.1 10:52:303 CUM IZENV 1 T OL 0.0 % L A LnF10.0 , d6 61.0 49.5 io_.. LnF50.0%,dB 57.5 45.5 so-'. LnF90.0%,d8 55.0 42.5 LnF95.0%,0 54.5 41.5 LnF99. 0%, dB 53.5 40.0 dB :. . F•L R 10:52:30 CUM 'ENV 2 Z CEL Instruments Ltd. CEL 593.C1R v 7.21 -----------------------pito ------------------------- Start 18 -DEC -13 1-3--32-'54 Mode -/- ENV A004 End 18 -DEC -13 13:54:44 Length 0 days 00:21:50 Mic Free Field 200v OFF Period 5 minutes Records 4 TE—A—D—ERT LAST CRL 18 -DEC -13 START 18 -DEC -13 13:32:54 .ND 18 -DEC -13 13:54:44 _ENGTH 0 DAYS 00:21:50 TIDIED RECS 4 PER 5min IIC=FF 200v=OFF TYPE=1 L R LnF18.0%, a6 ?i .6 58.3 Bo- LnF50.0%,a6 49.5 34.6 Bo= nQ, 56.2 44.2 46- .dBFLp LnF95.0%,dB 52.5 38.0 407 LnF99.0%,de 51.5 36.5 dB _. . 20- 79.4 13:32:54 CUM GENU 1 L R LnF18.0%, a6 58.9 47.9 e0-.. :.. LnF50.0%,a6 55.0 42.5 so-• LnF90.0%, dB 53.0 39.0 LnF95.0%,dB 52.5 38.0 407 LnF99.0%,de 51.5 36.5 dB _. . 20- FLR 13: J2: 54 CUr9 14ENU : CEL Instruments Ltd.CEL 593.C1R v 7.21 1� \L�� Start 18 -DEC -13 12-x!17 Mode -/- ENV A002 End 18 -DEC -13 1.3--fifir20 I Length 0 days 01:00:03 Mic Free Field 200v OFF Period 5 minutes Records 12 JEADERI LAST CRL 18 -DEC -13 START 18 -DEC -13 12:17:17 =ND 18 -DEC -13 13:17:29 _ENGTH 0 DAYS 01:00:03 TIMED RECS 12 PER 5min 9IC=FF 200V=OFF TYPE=1 CA� (�- 6' 0 fi OL 0.0 • L R SPLFMAX , dB 89.0 76.3 en- :.. SPLFMIN ,dB 4?.1 29.8 so= LECA , dB 66.3 45.8 40-• LnF95.0%,dB 51.0 34.5 dB .. . LnF99. 0%, dB 50.0 32.5 aF. F�LRLINPEGK , d8l 94.1 12:17:17 CUM I 7ENV 1 fi OL 0.0 % L R LnF10.0%,a6 65.5 46.5 eo= LnF50.0%,dB 55.0 41.0 e6- LnF90. 0%, d6 52.0 36.0 LnF95.0%,dB 51.0 34.5 dB": LnF99. 0%, dB 50.0 32.5 F'LR 12:17:17 CUM IZENV 2 CEL Instruments Ltd. CEL 593.C1R v 7.21 ------- ---------------------1 - Start 18 -DEC -13 alt -0-127 Mode -/- ENV A005 End 18 -DEC -13 1--: 9.32 )`I' `17 Length 0 days 01:00:05 Mic Free Field 200v OFF Period 5 minutes Records 12 HEADERI LAST CRL 18 -DEC -13 START 18 -DEC -13 14:10:2? END 18-DEc-13 15:10:32 LENGTH 0 DAYS 81:00:05 TIMED RECS 12 PER 5min IIC=FF 200u=OFF TYPE=1 fi OL 0.0 % L i A SPLFMAX , d6 90.5 78.5 eo-.. :.. SPLFMIN ,d6 48.7 34.0 sn- LEQ d6 61.6 49.7 ao- . . LnF95.0%,dB 53.5 38.5 d6 .. . LnF99.0 :, a6 52.5 37.0 d6:. . 20- F -D LINPEAK ,dB 94.1 14:10:27 CUM I7ENU 1 fi OL 0.0 % L A LnF10. 0%, dB 60.0 48.0 eo-• :.. LnF50.0%,a6 56.0 43.5 so- LnF90. 0%, d6 54.0 40.0 LnF95.0%,dB 53.5 38.5 407 LnF99.0 :, a6 52.5 37.0 d6:. . eo- . . F -L A 14:10:27 CUM IZEiNV 211 ©� y y ��� I )- S -I�� e J CEL Instruments Ltd. CEL 593.C1R v 7.21 -----------------------; J�------------------------ Start 18 -DEC -13 1�Mode -/- ENV A006 End 18 -DEC -13 +t-11`13 /6 A-1 Length 0 days 01:00:02 Mic Free Field 200v OFF Period 5 minutes Records 12 START 18 -DEC -15 1�D:6f:L1 .NU10-UEC-1s 16:s�:23 -ENGTH 0 DAYS 91:00:02 TIMED RECS 12 PER 5min IC=FF 2000=OFF TYPE=1 fi IOL 0.0 % L I A SPLFMAX ,do 84.0 81.6 ao-• : SPLFMIN ,do 51.T 36.0 Bo- LER , do 61.8 49.2 a0-. . LnF95.0%,do 56.0 40.5 do :. . LnF99.0%,do 55.0 39.0 dB _. . 20- F'Cq LINPEAK , al 93.7 15:37:21 CUM IZENU 1 fi IOL 0.0 : L A LnF10. 0%, aB 64.0 52.0 Bo- :.. LnF50.0%,do 60.0 47.0 Go-'. LnF90.0 :, de 57.0 42.0 LnF95.0%,do 56.0 40.5 "o- LnF99.0%,do 55.0 39.0 dB _. . 20-- F'L R 15:37:21 CUM IyENV 2 5 ►+ e 5 CEL Instruments Ltd Start 18 -DEC -13 End 18 -DEC -13 Length 0 days Mic Free Field Records ''LL l CEL 593.C1R v 7.21 44b------- --------------- X54 Mode -/- ENV A007 �r35 ��' S4, 00:25:41 200v OFF Period 5 minutes 5 _TART 18-DEC-1� 1b:tiN:ti4 -ND 18 -DEC -13 17:15:35 _ENGTH 0 DRYS 08:25:41 TIMED RECS 5 PER 5min 1IC=FF 200U=OFF TYPE=1 p L R SPLFMAX , do 84.8 64.9 eo- SPLFMIN ,de 46.4 30.7 so- LEQ , ds 54.5 40.8 LnF95.0%,de 49.0 32.5 do :. . LnF99. 0%, de 48.0 32.0 do 20-.. FLA LINPEAK ,de 92. 9 16:50:54 CUM 'ENV 1 p L R LnF10.0%,do 55.5 43.5 LnF50. 0%, de 52.0 35.5 so-. • LnF90. 0%, ds 49.5 33.0 LnF95.0%,de 49.0 32.5 LnF99. 0%, de 48.0 32.0 do 20- FLR 16:50:54 CUM IZ NU 2