Loading...
P2776 Pulte Homes - Summary Report for Avery Pines Home Exterior Noise Reduction Review, Aug 23, 2021 ver 1 August 23, 2021 Mr. Chad Onsgard Pulte Homes of Minnesota, LLC 7500 Flying Cloud Drive, Suite 670 Eden Prairie, MN 55344 Subject: Summary Report for Avery Pines Home Exterior Noise Reduction Review Eagan, Minnesota Dear Mr. Onsgard: We understand that you are planning to develop a residential neighborhood of townhomes in Eagan, Minnesota. Because the new homes will be close to the West End Gun Club, we understand the City of Eagan is requiring you to show that the exterior f açade of the houses provide sufficient noise reduction to keep the gun club noise inside the homes to no more than 45 dBA. As shown in the aerial photo below, the new development is north of the gun club property. The City of Eagan has asked you to provide a letter confirming that the noise requirements will be met. ESI has reviewed the construction documents to evaluate the noise reduction of the exterior walls and windows. This letter is a summary of our findings. Mr. Chad Onsgard August 23, 2021 Pulte Homes of Minnesota, LLC Page 2 Figure 1 – Aerial view of the West End Trap Club and the proposed Avery Pines residential development. Mr. Chad Onsgard August 23, 2021 Pulte Homes of Minnesota, LLC Page 3 BASIS OF ANALYSIS In September of 2019, ESI performed a noise study for the City of Eagan at the site while the gun range was in use to determine the club noise levels (see Figure 1 for measurement location) for purposes of rezoning the land to the north . As part of another project for eXp Realty, ESI recommended barrier walls to meet the State of Minnesota Shooting Range Protection Act requirements for outdoor noise at the proposed Avery Pines development. To evaluate noise inside the new townhomes, we used the gun range measurement data for the loudest hour (10AM-11AM) with the proposed barrier walls on berms to determine if the 45 dBA interior level will be achieved by the window and wall assemblies that are in the designs. We assume the 45 dBA requirement is an hourly equivalent continuous noise level (Leq), which is consistent with other work we have done for the City of Eagan. The level at the southern edge of the development with the proposed barrier wall and berm in place was 58 dBA. The level at the first row of townhomes on the western side of the development with the proposed barrier wall and berm in place was 60 dBA. We evaluated the expected noise levels inside a townhome at the southern edge of the development (with the southern noise control barrier) and at a townhome in the first row on the western side of the development (with the western noise control barrier). See Figure 2 below for these locations. Based on the drawings provided for the homes, we understand that the exterior wall assembly will consist of the following elements, listed from the house exterior to the interior: • Siding finish and house wrap • 7/16” oriented strand board (OSB) wall sheathing • 2 x 6 wood studs spaced 16” o.c. and filled with R-21 batt insulation • ½” thick gypsum board This wall assembly is estimated to have a sound transmission class (STC1) rating of STC 372. We also understand that the windows and patio doors are Simonton Builder Series, which will be rated around STC 273. These assemblies, their respective STC ratings, and the area of each were used to calculate composite STC ratings (STCC4) for rooms in the house for which we evaluated the expected noise level inside. 1 As defined in ASTM standard C634-13, Sound Transmission Class, or STC, is “a single-number rating calculated in accordance with Classification E413 using values of sound transmission loss. It provides an estimate of the performance of a partition in certain common sound insulation problems.” It is based on laboratory tests of wall and floor/ceiling assemblies that serve as acoustical barriers, with higher values representing better insulation. 2 Test number TLA-99-029a NRC-CNRC, IRC-IR-181, Laboratory Measurements of the Sound Insulation of Building Façade Elements. 3 From the window manufacturer. 4 Composite STC rating, or STCC, is the overall STC rating of an entire partition, including the wall, doors, windows or other penetrations or openings. Fenestration or penetrations usually reduce the composite STC rating of a partition since they are weaker points for noise transmission in the assembly . Mr. Chad Onsgard August 23, 2021 Pulte Homes of Minnesota, LLC Page 4 Figure 2 – Site development layout with townhomes evaluated highlighted. Mr. Chad Onsgard August 23, 2021 Pulte Homes of Minnesota, LLC Page 5 OUTDOOR TO INDOOR NOISE CALCULATIONS Calculations were prepared to determine outdoor noise transmission into a southern townhome and a western townhome, each facing the gun club (see Figure 2). We evaluated the noise level in the open living space on the main level consisting of the gathering room, sunroom, café dining area, and kitchen. We also evaluated the noi se inside the Owner’s Suite on the second level. The dimensions and architectural finishes for these spaces were used in the calculations to determine the room effect on the transmitted noise. The dimensions and areas of the exterior façade shared with these rooms was also used to determine the STC C of the exterior façade. Detailed calculations are provided in Attachment A. The calculated noise reduction from the exterior façade and the interior noise levels are shown in Table1 below. In 3 of the 4 spaces evaluated, the City of Eagan requirements are met. However, the 2nd level Owner’s Suite at the western townhomes requires modification to the rear exterior façade, as the calculated interior noise level slightly exceeded the City of Eagan requirements. Table 1 – Outdoor to Indoor Noise Calculation Results The exceedance at these western townhomes was due to the 2nd level having line of sight over the barrier to the gun range, effectively not receiving much (if any) reduction from the barrier. Additional mitigation is required at these locations to meet the City of Eagan requirement. Gathering / Sunroom / Café / Kitchen (Main Floor) 24 dBA 33.8 dBA Owner's Suite (2nd Floor)24 dBA 33.6 dBA Gathering / Sunroom / Café / Kitchen (Main Floor) 60 dBA 25 dBA 35.4 dBA Owner's Suite (2nd Floor) 73 dBA (no noise control barrier effect) 27 dBA 45.5 dBA Home Evaluated Southern Townhome Western Townhome 45 dBA Noise Level at Exterior of Home 58 dBA Room Evaluated Calculated Interior Noise Level from Loudest Gun Club Hour (10-11 AM) Calculated Noise Reduction from Exterior Façade City of Eagan Required Interior Noise Level Mr. Chad Onsgard August 23, 2021 Pulte Homes of Minnesota, LLC Page 6 RECOMMENDATIONS For any exterior façade, windows and doors are weak areas for noise transmission, as their STC ratings are usually less than that of the wall assembly itself. Therefore, to increase the composite STC rating (STCC), we first look at increasing the STC rating of windows and doors. For the 2nd level of the western townhomes to meet the City of Eagan requirement of 45 dBA, we recommend replacing the STC 27 windows with a model that has a rating of at least STC 31. All rear windows on the 2nd level of the first row of western houses should have at least STC 31 windows (see Figure 3 for location). Figure 3 – Site development layout with homes that should get STC 31 windows highlighted. Simonton states on their website they have ‘sound control glass options’ and are capable of meeting at least STC 34. If Pulte Homes would like to use this manufacturer, we recommend investigating their options for better sound control and choosing a window that meets the recommended rating. For more options or pricing, o ther manufacturers that have STC 31+ window options include: Mon-Ray, Inc., St. Cloud Window, and Kolbe Windows. Pulte Homes should request lab test data from the manufacturer of the chosen STC 31 windows to verify that the product selected does in fact meet the recommended rating. Mr. Chad Onsgard August 23, 2021 Pulte Homes of Minnesota, LLC Page 7 If these 2nd level rear windows at the first row of western townhomes are replaced with STC 31 windows, the interior hourly noise level is expected to be 41.8 dBA, which meets the City of Eagan requirement. CONCLUSIONS ESI was asked to evaluate the exterior noise reduction for the proposed Avery Pines residential development site north of the West End Trap Club in Eagan, Minnesota. The City of Eagan has requested that the façade provide enough noise reduction so that the hourly noise level from the gun range is below 45 dBA inside the homes. Our calculations evaluated the noise reduction provided by the homes’ façade at 4 different locations inside 2 worst-case (closest to the gun club) townhomes. One townhome was at the southern edge of the development near the proposed south noise control barrier wall, and the other townhome was in the first row of homes at the western side of the development near the barrier. We found that for the as-designed façade, 3 of the 4 locations met the City of Eagan requirement, while the 4th location (Owner’s Suite, 2nd level at western homes) evaluated was just above the requirement. To meet the interior noise requirement, we recommend replacing the 2nd level rear windows of all townhomes in the first row on the western side of the development with at least STC 31 windows. If this is done, the calculated interior noise level is expected to meet the City of Eagan requirement. We appreciate the opportunity to work with you on this project and remain available to assist in the resolution of these and any other matters. Please let us know if you have any questions or need more information. Sincerely, Andrew A.J. Schmitt Anthony J. Baxter, P.E. Consulting Engineer Principal ESI Engineering, Inc. ESI Engineering, Inc. File: P2776 Pulte Homes - Summary Report for Avery Pines Home Exterior Noise Reduction Review, Aug 23, 2021 ver 1 Attachment A Outdoor-Indoor Noise Transmission Calculations Avery Pines Home Exterior Noise Reduction Review – August 23, 2021 ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB Home Exterior Noise Reduction Review We understand that Pulte Homes of Minnesota is developing a residential neighborhood of townhomes near the West End Trap Club in Eagan, Minnesota. Because the new homes will be close to the West End Gun Club, we understand the City of Eagan is requiring Pulte Homes to show that the exterior façade of the houses provide at sufficient noise reduction so that gun club noise inside the homes is below 45 dBA. ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB Noise Control Constants 1/3 Octave Bands Used: dBA Scale Corrections: Air Attenuation: (Hansen, pg 157) Octave Band Noise Criterion (NC) Curve Sound Pressure Levels: ≔NC 47 51 54 57 60 64 67 71 74 77 80 36 40 44 48 52 56 60 64 67 71 75 29 33 37 41 45 50 54 58 62 67 71 22 26 31 35 40 45 49 54 58 63 68 17 22 27 31 36 41 46 51 56 61 66 14 19 24 29 34 39 44 49 54 59 64 12 17 22 28 33 38 43 48 53 58 63 11 16 21 27 32 37 42 47 52 57 62 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥⎦ ≔f 50 63 80 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔dBA -30.2 -26.2 -22.5 -19.1 -16.1 -13.4 -10.9 -8.6 -6.6 -4.8 -3.2 -1.9 -0.8 0.0 0.6 1.0 1.2 1.3 1.2 1.0 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥⎦ ≔m ⋅ 0.0 0.1 0.1 0.2 0.3 0.5 0.8 1.1 1.9 2.6 3.4 4.7 6.1 7.4 9.2 11.0 12.8 17.0 21.2 25.4 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ―――dB ⋅1000 m Specific NC-Levels ≔NC15i NC ,i 1 ≔NC20i NC ,i 2 ≔NC25i NC ,i 3 ≔NC30i NC ,i 4 ≔NC35i NC ,i 5 ≔NC40i NC ,i 6 ≔NC45i NC ,i 7 ≔NC50i NC ,i 8 ≔NC55i NC ,i 9 ≔NC60i NC ,i 10 ≔NC65i NC ,i 11 References: 1. Architectural Acoustics: Principles and Design, Madan Mehta, James Johnson and Jorge Rocafort, Prentice Hall, 1998 2. Acoustics Leo L. Beranek, McGraw-Hill Book Company, 1954 3. Sound and Vibration Design and Analysis, National Environmental Balancing Bureau (NEBB), 1994 4. Noise Control: From Concept to Application, Colin Hansen, Taylor & Francis, 2005 5. Handbook of HVAC Applications, American Society of Heating, Refrigeration and Air-Conditioning Engineers, 2011 ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB 1. Gun Range Sound Data (Measured for the City of Eagan on September 22, 2019): Sound Pressure Level Spectrum (in dB) from Gun Club during loudest hour (10AM - 11AM): Gun Club Noise at Monitoring Location (Leq): Sound Power Distance Correction: ≔Q 2 ≔d 900 ft ≔Leq.10AM 61.3 63.2 64 64.1 59.7 54.5 58.2 63 68.4 69.3 69.9 67.9 70.1 68.3 64.2 66.2 63 62.3 58.8 55.4 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ dB =f 50 63 80 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ Hz ≔Lw.10AM =+-+Leq.10AM ⋅20 log ⎛ ⎜⎝ ―d ft ⎞ ⎟⎠ ⋅10 log ((Q))0.7 118 120 121 121 116 111 115 120 125 126 127 125 127 125 121 123 120 119 116 112 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ dB Check Sound Pressure dBA Level : Check Sound Power dBA Level : ≔Leq.dBA.10AM +Leq.10AM dBA ≔Lw.dBA.10AM +Lw.10AM dBA ≔Leq.10AM.dBA ⋅10 log ⎛ ⎜ ⎜ ⎝ ∑ =i 1 20 10 ―――― Leq.dBA.10AMi 10 ⎞ ⎟ ⎟ ⎠ ≔Lw.10AM.dBA ⋅10 log ⎛ ⎜ ⎜ ⎝ ∑ =i 1 20 10 ―――― Lw.dBA.10AMi 10 ⎞ ⎟ ⎟ ⎠ =Leq.10AM.dBA 76 dB(A)=Lw.10AM.dBA 133 dB(A) ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB Gun Club Noise at Closest Homes (South Side): Gun Club Noise at Next Closest Homes (West Side): ≔rs 935 ft ≔Q 2 ≔rw 1305 ft ≔Q 2 ≔Lp.south =-+-Lw.10AM ⋅20 log ⎛ ⎜ ⎝ ― rs ft ⎞ ⎟ ⎠ ⋅10 log ((Q))0.7 61 63 64 64 59 54 58 63 68 69 70 68 70 68 64 66 63 62 58 55 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ dB ≔Lp.west =-+-Lw.10AM ⋅20 log ⎛ ⎜ ⎝ ― rw ft ⎞ ⎟ ⎠ ⋅10 log ((Q))0.7 58 60 61 61 56 51 55 60 65 66 67 65 67 65 61 63 60 59 56 52 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ dB ≔Lp.south.dBA =+Lp.south dBA 31 37 41 45 43 41 47 54 61 64 66 66 69 68 64 67 64 63 60 56 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔Lp.west.dBA =+Lp.west dBA 28 34 38 42 40 38 44 51 59 61 63 63 66 65 62 64 61 60 57 53 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔LdBA.south ⋅10 log ⎛ ⎜ ⎜ ⎝ ∑ =i 1 20 10 ―――― Lp.south.dBAi 10 ⎞ ⎟ ⎟ ⎠ ≔LdBA.west ⋅10 log ⎛ ⎜ ⎜ ⎝ ∑ =i 1 20 10 ――― Lp.west.dBAi 10 ⎞ ⎟ ⎟ ⎠ =LdBA.south 76 dB(A)=LdBA.west 73 dB(A) ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB Gun Club Noise with Barrier Attenuation (South): Gun Club Noise with Barrier Attenuation (West): ≔Lp.southbarr =-Lp.south 8 8 8 10 10 10 13 13 13 16 16 16 19 19 19 22 22 22 24 24 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ 53 55 56 54 49 44 45 50 55 53 54 52 51 49 45 44 41 40 34 31 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ dB ≔Lp.westbarr =-Lp.west 6 6 6 7 7 7 9 9 9 11 11 11 14 14 14 17 17 17 20 20 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ 52 54 55 54 49 44 46 51 56 55 56 54 53 51 47 46 43 42 36 32 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ dB Check dBA Level : Check dBA Level : ≔Lp.dBA.southbarr +Lp.southbarr dBA ≔Lp.dBA.westbarr +Lp.westbarr dBA ≔Lp.southbarr.dBA ⋅10 log ⎛ ⎜ ⎜ ⎝ ∑ =i 1 20 10 ―――― Lp.dBA.southbarri 10 ⎞ ⎟ ⎟ ⎠ ≔Lp.westbarr.dBA ⋅10 log ⎛ ⎜ ⎜ ⎝ ∑ =i 1 20 10 ―――― Lp.dBA.westbarri 10 ⎞ ⎟ ⎟ ⎠ =Lp.southbarr.dBA 58.1 dB(A)=Lp.westbarr.dBA 60 dB(A) Since the City of Eagan has requested that a level of 45 dBA be met inside the house, the exterior facade needs to provide at least 13 dBA of reduction at the south homes. Since the City of Eagan has requested that a level of 45 dBA be met inside the house, the exterior facade needs to provide at least 15 dBA of reduction at the main level of the south homes. ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB 2. Gathering / Sunroom / Café / Kitchen Sound Absorption Data: Room Dimensions: ≔L ⋅26.8 ft ≔Wmain ⋅22.5 ft ≔Hmain ⋅9 ft Surface Absorption Coefficients: Gypsum Ceiling: (Egan) Carpet Floor: (Hann Tucker) Wood Floor: (C.M. Harris) Exterior Glazing: (Mehta, pg. 408) Gyp on Studs: (Mehta, pg. 407) ≔S1 =⋅LWmain 603 ft 2 ≔S2 175 ft 2 ≔S3 =-⎛⎝⋅Wmain L⎞⎠S2 428 ft 2 ≔S4 106 ft 2 ≔S5 =-⎛⎝⋅⎛⎝+⋅2 LWmain⎞⎠Hmain⎞⎠S4 579 ft 2 ≔α1 0.37 0.35 0.33 0.31 0.29 0.23 0.16 0.10 0.08 0.07 0.05 0.05 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔α2 0.03 0.05 0.08 0.12 0.15 0.18 0.22 0.25 0.33 0.42 0.50 0.53 0.57 0.60 0.63 0.67 0.70 0.70 0.70 0.70 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔α3 0.19 0.18 0.17 0.16 0.15 0.14 0.12 0.11 0.11 0.10 0.10 0.09 0.08 0.07 0.07 0.06 0.06 0.06 0.07 0.07 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔α4 0.27 0.24 0.21 0.18 0.15 0.12 0.08 0.05 0.05 0.04 0.04 0.04 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔α5 0.18 0.15 0.13 0.11 0.10 0.09 0.08 0.07 0.06 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04 0.04 0.04 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ Total Surface Area and Volume: ≔k ‥15 Total Surface Area, square feet: Room Volume, cubic feet: ≔Stotal ∑ k Sk =Stotal 1891 ft 2 ≔V =⋅⋅LWmain Hmain 5427 ft 3 Total Room Absorption: Average Absorption in Room (Ref. Beranek, eq. 10.17): Room Constant (Ref. Beranek, eq. 10.46): ≔αavg ―――― ∑ k ⎛ ⎝ ⋅αk Sk ⎞ ⎠ Stotal ≔Rmainfloor →――― ――― ⋅Stotal αavg ⎛⎝-1 αavg⎞⎠ =αavg 0.234 0.216 0.203 0.19 0.179 0.156 0.128 0.104 0.102 0.101 0.102 0.103 0.101 0.101 0.107 0.108 0.114 0.117 0.12 0.123 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ =Rmainfloor 578 522 481 443 413 349 276 220 215 213 216 217 212 213 227 229 243 251 257 264 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ sabins ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB 3. Owner's Suite Sound Absorption Data: Room Dimensions: ≔L ⋅14.4 ft ≔Wowner ⋅13.5 ft ≔Howner ⋅8 ft Surface Absorption Coefficients: Gypsum Ceiling: (Egan) Carpet Floor: (Hann Tucker) Exterior Glazing: (Mehta, pg. 408) Gyp on Studs: (Mehta, pg. 407) ≔S1 =⋅LWowner 194 ft 2 ≔S2 =⋅LWowner 194 ft 2 ≔S3 56 ft 2 ≔S4 =-⎛⎝⋅⎛⎝+⋅2 LWowner⎞⎠Howner⎞⎠S3 282 ft 2 ≔α1 0.37 0.35 0.33 0.31 0.29 0.23 0.16 0.10 0.08 0.07 0.05 0.05 0.04 0.04 0.05 0.06 0.07 0.08 0.08 0.09 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔α2 0.03 0.05 0.08 0.12 0.15 0.18 0.22 0.25 0.33 0.42 0.50 0.53 0.57 0.60 0.63 0.67 0.70 0.70 0.70 0.70 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔α3 0.27 0.24 0.21 0.18 0.15 0.12 0.08 0.05 0.05 0.04 0.04 0.04 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔α4 0.18 0.15 0.13 0.11 0.10 0.09 0.08 0.07 0.06 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04 0.04 0.04 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ Total Surface Area and Volume: ≔k ‥14 Total Surface Area, square feet: Room Volume, cubic feet: ≔Stotal ∑ k Sk =Stotal 727 ft 2 ≔V =⋅⋅LWowner Howner 1555 ft 3 Total Room Absorption: Average Absorption in Room (Ref. Beranek, eq. 10.17): Room Constant (Ref. Beranek, eq. 10.46): ≔αavg ―――― ∑ k ⎛ ⎝ ⋅αk Sk ⎞ ⎠ Stotal ≔Rowner →――― ――― ⋅Stotal αavg ⎛⎝-1 αavg⎞⎠ =αavg 0.198 0.184 0.176 0.172 0.168 0.154 0.139 0.125 0.137 0.153 0.17 0.178 0.185 0.193 0.204 0.212 0.223 0.226 0.226 0.228 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ =Rowner 179 164 156 151 147 132 117 104 115 132 148 157 165 174 186 196 209 212 212 215 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ sabins ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB 4. Exterior Façade Data: Surface Areas (sqft): Gathering/Sunroom/Café/Kitchen: Owner's Suite: ≔Smainfloor =⋅Wmain Hmain 203 ft 2 ≔Sowner =⋅Wowner Howner 108 ft 2 Transmission Loss (dB): Exterior Wall, STC 37 (Test Number TLA-99-029a from NRC-CNRC) Exterior Window / Patio Door, STC 27 (Test Number TLA-99-197a from NRC-CNRC) ≔TLWall 18 16 17 14 13 19 32 33 32 37 37 35 42 44 51 52 51 49 48 53 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔TLWin 14 16 19 20 22 19 17 13 19 19 22 26 28 33 36 38 38 40 36 33 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔τWall 10 ⎛ ⎜ ⎝ ――― -TLWall 10 ⎞ ⎟ ⎠≔τWin 10 ⎛ ⎜ ⎝ ――― -TLWin 10 ⎞ ⎟ ⎠ (Ref. Hansen, Eq.6.27) ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB 5. Gathering / Sunroom / Café / Kitchen Wall Composite Transmission Loss: Surface Areas of Exterior Façade Components: Window Surface Area: Wall Surface Area: ≔SWin 106 ft 2 ≔SWall =-Smainfloor SWin 97 ft 2 Composite Transmission Loss of Wall With Windows and Patio Door: ≔j ‥12 ≔Stotal SWall SWin ⎡ ⎢⎣ ⎤ ⎥⎦ ≔τtotal τWall τWin ⎡ ⎢⎣ ⎤ ⎥⎦≔τcomp ――――― ∑ =j 1 2 ⎛ ⎜⎝ ⋅Stotalj τtotalj ⎞ ⎟⎠ ∑ =j 1 2 StotaljRef. Hansen, Eq.6.26 ≔TLmainfloor ⋅-10 log ⎛⎝τcomp⎞⎠=TLmainfloor 15.5 16.0 17.9 16.2 15.7 19.0 19.7 15.8 21.6 21.7 24.7 28.3 30.7 35.5 38.7 40.7 40.6 42.3 38.6 35.8 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ Ref. Hansen, Eq.6.9 ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB 6. Owner's Suite Wall Composite Transmission Loss: Surface Areas of Exterior Façade Components: Window Surface Area: Wall Surface Area: ≔SWin 56 ft 2 ≔SWall =-Sowner SWin 52 ft 2 Composite Transmission Loss of Wall With Window: ≔j ‥12 ≔Stotal SWall SWin ⎡ ⎢⎣ ⎤ ⎥⎦ ≔τtotal τWall τWin ⎡ ⎢⎣ ⎤ ⎥⎦≔τcomp ――――― ∑ =j 1 2 ⎛ ⎜⎝ ⋅Stotalj τtotalj ⎞ ⎟⎠ ∑ =j 1 2 StotaljRef. Hansen, Eq.6.26 ≔TLowner ⋅-10 log ⎛⎝τcomp⎞⎠=TLowner 15.5 16.0 17.9 16.1 15.6 19.0 19.7 15.8 21.7 21.8 24.7 28.4 30.7 35.5 38.7 40.7 40.7 42.4 38.6 35.8 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ Ref. Hansen, Eq.6.9 ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB 7. Determine Noise Reduction Provided by the Exterior Facades: Noise Reduction Calculation (Ref. Beranek, eq. 10.83): Gathering/Sunroom/Cafe/Kitchen Wall Noise Reduction: Owner's Suite Wall Noise Reduction: ≔NRmainfloor -TLmainfloor ⋅10 log ⎛ ⎜ ⎝ +―1 4 ――― Smainfloor Rmainfloor ⎞ ⎟ ⎠ ≔NRowner -TLowner ⋅10 log ⎛ ⎜ ⎝ +―1 4 ―― Sowner Rowner ⎞ ⎟ ⎠ Noise Reduction Results (dB): =NRmainfloor 17.7 18.0 19.7 17.7 17.0 19.8 19.8 15.1 20.9 21.0 23.9 27.6 29.8 34.7 38.1 40.1 40.3 42.1 38.4 35.7 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ =NRowner 16.2 16.4 18.2 16.3 15.7 18.7 19.0 14.7 20.9 21.5 24.8 28.7 31.1 36.1 39.5 41.7 41.8 43.6 39.8 37.0 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB 8. Determine Noise Levels from Gun Club's Loudest Hour in a South House Due to Noise Reduction from the Exterior Wall Partitions: Gun Club Loudest Hour Leq in the Gathering/Sunroom/Cafe/Kitchen with Exterior Facade Noise Reduction (dB): Gun Club Loudest Hour Leq in the Owner's Suite with Exterior Facade Noise Reduction (dB): ≔Lp.mainfloor.south -Lp.southbarr NRmainfloor ≔Lp.owner.south -Lp.southbarr NRowner =Lp.mainfloor.south 35 37 36 36 32 24 25 35 34 32 30 24 21 14 7 4 0 -2 -4 -5 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ =Lp.owner.south 37 38 37 37 34 25 26 35 34 31 29 23 20 13 5 2 -1 -4 -5 -6 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥⎦ ≔LdBA.mainfloor.south +Lp.mainfloor.south dBA ≔LdBA.owner.south +Lp.owner.south dBA ≔Lsouth.mainfloor.dBA ⋅10 log ⎛ ⎜ ⎜ ⎝ ∑ =i 1 20 10 ――――― LdBA.mainfloor.southi 10 ⎞ ⎟ ⎟ ⎠ ≔Lsouth.owner.dBA ⋅10 log ⎛ ⎜ ⎜ ⎝ ∑ =i 1 20 10 ――――― LdBA.owner.southi 10 ⎞ ⎟ ⎟ ⎠ Expected Interior Hourly Noise Levels During Loudest Hour at Gun Club: =Lsouth.mainfloor.dBA 33.8 dB(A)=Lsouth.owner.dBA 33.6 dB(A) Both of the calculated noise levels for homes on the southern edge of the property meet the 45 dBA requirement of the city. The exterior façade provides approximately 24 to 26 dBA of reduction. ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB 9. Determine Noise Levels from Gun Club's Loudest Hour in a West House Due to Noise Reduction from the Exterior Wall Partitions: Gun Club Loudest Hour Leq in the Gathering/Sunroom/Café/Kitchen with Exterior Façade Noise Reduction (dB): Gun Club Loudest Hour Leq in the Owner's Suite with Exterior Façade Noise Reduction (dB): ≔Lp.mainfloor.west -Lp.westbarr NRmainfloor ≔Lp.owner.west -Lp.west NRowner =Lp.mainfloor.west 34 36 35 36 33 24 26 36 35 34 32 26 23 16 9 6 2 0 -3 -4 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ =Lp.owner.west 42 44 43 45 41 33 36 45 44 45 42 36 36 29 21 21 18 16 16 15 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔LdBA.mainfloor.west +Lp.mainfloor.west dBA ≔LdBA.owner.west +Lp.owner.west dBA ≔Lwest.mainfloor.dBA ⋅10 log ⎛ ⎜ ⎜ ⎝ ∑ =i 1 20 10 ――――― LdBA.mainfloor.westi 10 ⎞ ⎟ ⎟ ⎠ ≔Lwest.owner.dBA ⋅10 log ⎛ ⎜ ⎜ ⎝ ∑ =i 1 20 10 ―――― LdBA.owner.westi 10 ⎞ ⎟ ⎟ ⎠ Expected Interior Hourly Noise Levels During Loudest Hour at Gun Club: =Lwest.mainfloor.dBA 35.4 dB(A)=Lwest.owner.dBA 45.5 dB(A) The calculated noise level for the main level of homes on the western side of the property meet the 45 dBA requirement of the city. The exterior façade provides approximately 25 dBA of reduction. The calculated noise level for the 2nd level of homes on the western side of the property does not meet the 45 dBA requirement of the city at the main floor. The exterior façade provides approximately 27 dBA of reduction. ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB 10. Recommendations for 2nd Level of Western Homes (Improved STC 31 Windows): Surface Areas (sqft): Owner's Suite: ≔Sowner =⋅Wowner Howner 108 ft 2 Transmission Loss (dB): Exterior Window / Patio Door, STC 31 (Test Number TLA-99-173a from NRC-CNRC) ≔TLWinSTC 19 19 21 20 20 20 19 18 25 22 28 29 32 33 35 37 38 40 38 31 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔τWinSTC 10 ⎛ ⎜ ⎝ ―――― -TLWinSTC 10 ⎞ ⎟ ⎠ (Ref. Hansen, Eq.6.27) Surface Areas of Exterior Façade Components: Window Surface Area: Wall Surface Area: ≔SWin 56 ft 2 ≔SWall =-Sowner SWin 52 ft 2 Composite Transmission Loss of Wall With Window: ≔j ‥12 ≔Stotal SWall SWin ⎡ ⎢⎣ ⎤ ⎥⎦ ≔τtotal τWall τWinSTC ⎡ ⎢⎣ ⎤ ⎥⎦≔τcomp ――――― ∑ =j 1 2 ⎛ ⎜⎝ ⋅Stotalj τtotalj ⎞ ⎟⎠ ∑ =j 1 2 StotaljRef. Hansen, Eq.6.26 ≔TLownerSTC ⋅-10 log ⎛⎝τcomp⎞⎠=TLownerSTC 18.5 17.3 18.6 16.1 15.3 19.5 21.7 20.7 27.1 24.7 30.4 30.9 34.5 35.5 37.8 39.7 40.7 42.4 40.5 33.8 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ Ref. Hansen, Eq.6.9 ESI Engineering 7831 Glenroy Road, Suite 218 Minneapolis MN 55439 Client: Pulte Homes of Minnesota Project: P2776 Calculation: Home Exterior Noise Reduction Review August 23, 2021 Calculations by: AAJS Checked by: AJB Noise Reduction Calculation (Ref. Beranek, eq. 10.83): Owner's Suite Wall Noise Reduction: ≔NRownerSTC -TLownerSTC ⋅10 log ⎛ ⎜ ⎝ +―1 4 ―― Sowner Rowner ⎞ ⎟ ⎠ Noise Reduction Results (dB): =NRownerSTC 19.2 17.7 18.9 16.3 15.4 19.2 21.0 19.6 26.4 24.4 30.5 31.2 34.9 36.1 38.6 40.7 41.8 43.6 41.7 35.1 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ Gun Club Loudest Hour Leq in the Owner's Suite with Exterior Façade Noise Reduction (dB): ≔Lp.owner.westSTC -Lp.west NRownerSTC =Lp.owner.westSTC 39 42 42 45 41 32 34 40 39 42 36 33 32 29 22 22 18 16 14 17 ⎡ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎢ ⎣ ⎤ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎥ ⎦ ≔LdBA.owner.westSTC +Lp.owner.westSTC dBA ≔Lwest.ownerSTC.dBA ⋅10 log ⎛ ⎜ ⎜ ⎝ ∑ =i 1 20 10 ――――― LdBA.owner.westSTCi 10 ⎞ ⎟ ⎟ ⎠ =Lwest.ownerSTC.dBA 41.8 dB(A) The calculated noise level for the 2nd level of homes on the western side of the property meet the 45 dBA requirement of the city with improved STC 31 windows. The exterior façade provides approximately 31 dBA of reduction.