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HomeMy WebLinkAbout1.32 Noise Report - HEI - Cerise 20140512ANS ENVIRONMENTAL ACOUSTICS AND VIBRATION CONSULTING May 12, 2014 Ben Langenfeld, P.E. Greg Lewicki and Associates 11541 Warrington Court Parker, Colorado 80138 Re: Analysis of Noise from Proposed Cerise Gravel Pit for United Companies Dear Mr. Langenfeld, Per your request, Hankard Environmental has predicted the level of noise that is expected to be generated by each of United Companies proposed Cerise Gravel Pit mining phases. It is our understanding that in 2011, Lafarge was granted approval by Garfield County Commissioners to mine this same area, but has since transferred ownership to United Companies. The proposed mining plan by United Companies differs from Lafarge's approved mining plan in addition to the mining phases themselves, including: (a) the current plan does not include a concrete batch plant or an asphalt plant, and (b) there is some reclamation completed prior to the final mining phase. Based on our analysis of the new United Companies mining plan for the Cerise Gravel Pit, we find that noise from the proposed mining activities will be in compliance with Section 7- 1002 (C) Noise/Vibration of the Garfield County Land Use Development Code (2013). This report describes the applicable noise limits, the methods used to predict the noise levels, the predicted noise level results, the assessment of compliance, and required noise mitigation. APPLICABLE NOISE LIMITS The proposed Cerise Gravel Pit must adhere to the Garfield County Land Use and Development Code (LUDC), Article 7: Standards, Division 10. Additional Standards for Industrial Uses, Section 7-1002 Gravel Extraction, C. Noise/Vibration (2013) as shown in Attachment A. Per this standard, the assessment of noise compliance is to be made at a location 25 feet outside the property on which the facility is located, which in this case is the Cerise property. The noise limits are dependent on the time of day and the land use occurring on receiver properties. The proposed hours of mining operations (e.g. excavation, crushing, hauling, etc.) are from 7:00 am to 5:00 pm, thus the "daytime" (7:00 am to 7:00 pm) limits apply (see Attachment A, Table 7-1002). In terms of land use, Figure 1 shows the land use surrounding the Cerise property. The following describes how the appropriate noise level limit was established for each parcel (Residential, Commercial, Light Industrial, or Industrial). • West (yellow): Large parcel contains the existing Powers Gravel Pit, which is an Industrial use, thus the Industrial limits apply. • North (blue): The parcel is zoned Rural, but is intended for residential use, thus the Residential limits apply. COLORADO • WISCONSIN • MAINE phone: (303) 666-0617 • www.hankardinc.com • fax (303) 600-0282 J�HANKARD 1 ENVIRONMENTAL AO 045{IGS AHD VIDRAIION COH841.1,FNG • East (green): Most of this parcel is used agriculturally, but there is a residence in the northern part of the parcel. Thus the Light Industrial limits were selected for the portion of the parcel bordering the Cerise property. • East (purple): This large parcel is used as agricultural, and thus the Light Industrial standard applies. • South (brown): These parcels are all zoned PUD, but the existing use directly south of the Cerise Gravel Pit is vacant, thus the Light Industrial standard was applied (similar to agriculture). • Nearest Existing Residence i �raL�J`• Industrial 80 dBA ©@fig@ ©7© I x.00.3 ht Industrial - 75 dBA 09`008 PUD •. Light Indus 75 dBA Light Industrial 75 dBA 25 153 11`4144P10011100— bpi IP Magell"Wei r 'oh ale. 116 Mr iO8 8 FIGURE 1 - NOISE LEVEL LIMITS 25 FEET OUTSIDE THE CERISE PROPERTY LINE BASED ON EXISTING USE Some caveats apply to these limits. During the daytime, the noise level limit can be increased by 10 dBA for 15 minutes in any one-hour period. This will be applicable to the mobile sources of mining noise, such as earth moving equipment approaching and receding from the edges of the property line. Also, noise level limits are decreased by 5 dBA for intermittent, shrill type sounds, which on this project primarily applies to back-up alarms on earth moving equipment (unless Analysis of Noise from Proposed Cerise Gravel Pit for United Companies page 2 May 12, 2014 J�HANKARD 1 ENVIRONMENTAL Ac OuS{IGS AHD VIDRAIION CO HS4lFFNG 'white -noise' back-up alarms are used, which are not impulsive or shrill). Finally, during construction phases (i.e.: construction of noise mitigation berms), the maximum permissible noise level is 80 dBA for all uses. NOISE LEVEL PREDICTION METHODOLOGY Noise levels were predicted for eight mining phases, which include Pre -mining, Mining Phases 1 to 6, and Reclamation. Maps depicting the activities for each phase are shown in Attachment B in which the red lines depict moving point sources and red triangles depict stationary point sources. For each phase, the primary noise making equipment was identified and modeled using the Sound PLAN v7.3 software package implementing the ISO 9613-2 standard. The sound power level of each mining noise source used in the analysis for each mining phase is provided in Attachment B. This data was taken from sound level measurements of similar equipment conducted by Hankard Environmental, as well as from published sound power level data. All stationary or mostly stationary sources (e.g.: crushers, screens, etc.) were modeled as point sources and moving sources (e.g.: haul trucks, scrapers, etc.) were modeled as line sources. All trucks and mobile construction equipment noise sources were modeled at a height of 7 feet above the ground. Stationary sources such as the jaw crusher and screens were modeled at a height of 10 feet above the ground. Noise level predictions points were located 25 feet outside the mine property, and at the residences, and all at a height of 5 feet above the ground. The ground type for the gravel pit permit area was modeled as "hard soil" with a ground coefficient of 0.1. The surrounding area was modeled as dry grass lands with a ground coefficient of 0.6. For reference, a ground coefficient of 0.0 represents pavement and water, and 1.0 represents completely sound absorptive ground. The following describes the equipment and activities modeled for each phase. Note that the "processing plant" consists of one jaw crusher, two cone crushers, two screens, one loader, and the associated enclosed diesel power engine -generator sets. Also, for any processing, haul trucks were modeled traveling from the bottom of the pit to the scale and main access to the county road. Pre -Mining: The main activity is removing the overburden and topsoil from the planned mining areas. A large overburden stockpile at least 16 feet high will be stored near the entrance and a smaller top soil stockpile about 10 feet high will wrap around the southern portion of the mining area. Both of these stockpiles are effective at mitigating the noise propagation. The primary noise sources include four scrapers, one bulldozer, and one loader. Mining Map 1: Mining and processing will start, with the processing plant located near the entrance to the gravel pit. Mining Map 2: The process plant remains in a similar location as Map 1, but more mining is conducted to the south. After this southern area is mined, a majority of the overburden stockpile and a portion of the topsoil stockpile will the used to reclaim the southern area. Thus, in addition to the operation of the processing plant, there will be scrapers and loaders conducting reclamation. Analysis of Noise from Proposed Cerise Gravel Pit for United Companies page 3 May 12, 2014 J�HANKARD 1 ENVIRONMENTAL A ouz{IGS AHD VIDRAIION CO HS4lFFNG Mining Map 3: The process plant may shift slightly to the east with mining continuing where the overburden stockpile was previously located. In addition to the processing plant, scrapers and loaders will be used to clear the overburden and topsoil from the area to the east and construct a 15 foot tall noise berm along the northern permit line. Mining Map 4: Mining and processing continues in the east part of the permit area with some overburden and topsoil removal to the southeast using scrapers. Mining Map 5: Mining and processing continues in the southeast portion of the permit area with some overburden and topsoil removal in the middle of the permit area using scrapers. Mining Map 6: Mining and processing continues in the south portion of the permit area. Reclamation: The overburden and topsoil berms are removed and used to fill in portions of the mined gravel pit. This involves scrapers, loaders and possibly a bulldozer. PREDICTED NOISE LEVELS AND ASSESSMENT OF COMPLIANCE Noise level compliance for a gravel pit in Garfield County is assessed by comparing the predicted noise levels from the various mining activities at a location 25 feet outside the property line to the noise level thresholds defined by the LUDC. Table 1 provides the maximum predicted noise level for each phase (map) of the proposed mining, with the noise level limit in each direction from the Cerise property at the top of each column. In all cases, the maximum predicted levels are lower than the limits. Therefore, based on our analysis the United Companies proposed Cerise Gravel Pit mining operations are expected to be in compliance with Garfield County LUDC, Article 7: Standards, Division 10. Additional Standards for Industrial Uses, Section 7-1002 Gravel Extraction, C. Noise/Vibration (2013). Note that noise level contour maps for each phase are provided in Attachment D. While not necessary to show compliance with the LUDC, it should be noted that the predicted noise levels due to the mining operations at all residences outside the Cerise property do not exceed 55 dBA for any phase except during the construction and de -construction of the northern noise mitigation berm where the residence to the east (Riley) could reach 56 dBA. As previously described, the noise level limit during "construction activities" is 80 dBA, thus 56 dBA remains within the limits. As for the three residences located on the Cerise property, noise levels are predicted to remain at or below 55 dBA for all mining phases except for the one residence nearest to County Road 103 where levels are predicted to reach 58 dBA during Phase 1 (due to jaw crusher). Noise levels at all three Cerise property residences exceed 55 dBA during construction of the northern stockpile (Pre -Mining phase), and the construction and de -construction of the northern stockpile berm (Map 3 and Reclamation). The construction of the northern stockpile and northern berms are considered construction activities and are subject to the 80 dBA noise level limit. Analysis of Noise from Proposed Cerise Gravel Pit for United Companies page 4 May 12, 2014 HANICARD ENVIRONMENTAL AG04571G5 AH4 VIDRA[ION COH841.FFNG TABLE 1 Predicted Maximum Sound Pressure Levels for Each Mining Phase (dBA) North South East West Mining Phase / Map Property Line Property Line Property Line Property Line (55 dBA Limit) (75 dBA Limit) (75 dBA) (80 dBA Limit) Pre -Mining 53 61 57 61 Map 1 53 60 55 65 Map 2 49 57 51 61 Map 3 53 58 69 62 Map 4 51 64 66 61 Map 5 51 65 65 56 Map 6 51 63 66 57 Reclamation 53 56 68 61 In Compliance? Yes Yes Yes Yes Analysis of Noise from Proposed Cerise Gravel Pit for United Companies page 5 May 12, 2014 J�HANKARD 1 ENVIRONMENTAL A ouz{IGS AHD VIDRAIION CO HS4lFFNG MITIGATION REQUIREMENTS TO MAINTAIN COMPLIANCE For our analysis it was assumed that the following list of noise mitigation measured would be employed. 1) Noise berms/ stockpiles of at least 15 feet tall along the north permit line are required. 2) Backup alarms using white noise or other noise controlling technology are required. 3) All generators should be housed within noise reducing enclosures using commercial grade silencers (i.e. 20 dB insertion loss or more). 4) All construction equipment was assumed to be standard with standard mufflers. Please call if you have any questions. Sincerely, Jeff M. Cerjan Senior Acoustical Consultant Analysis of Noise from Proposed Cerise Gravel Pit for United Companies page 6 May 12, 2014 ATTACHMENT A GARFIELD COUNTY GRAVEL EXTRACTION NOISE STANDARDS 2013 Garfield County LURC — 2013 7-1002 Gravel Extraction C. NoiseNibration. Gravel extraction operations shall be conducted in a manner such that the volume of sound generated does not constitute a public nuisance or hazard. Gravel extraction operations shall comply with the standards set forth in C.R.S., Article 12, Title 25, except as such standards are modified as follows: 1. An Applicant shall submit a noise study that demonstrates the proposed gravel operation can meet the requirements in the matrix below based on measuring the sound levels of noise radiating from a property line at a distance of 25 feet or more beyond the subject property, except as excluded for construction activities per C.R.S. § 25-12-103 et seq., that allows up to 80 dB(A). 2. The dB(A) threshold shown in Table 7-1002 shall be that of the receiver and not that of the emitter. For example, while the gravel operation would be considered an industrial operation, the dB(A) levels shown below are measured according to the neighboring uses so that if a residential use was located adjacent to the operation, sound levels could not exceed 55 dB(A) from 7:00 a.m.to 7:00 p.m. and 50 dB(A) from 7:01 p.m. to 6:59 a.m. Table 7-1002: dB(A) Threshold per Neighboring Use Use 7 am to 7 pm 7 pm to 7 am Residential Commercial Light Industrial Industrial 55 dB(A) 60 dB(A) 70 dB(A) 80 dB(A) 50 dB(A) 55 dB(A) 65 dB(A) 75 dB(A) 3. Every use shall be so operated that the ground vibration inherently and recurrently generated is not perceptible without instruments at any point of any boundary line of the property on which the use is located. ATTACHMENT B CERISE GRAVEL PIT - MINING MAPS 0 w 0 z w 2 J CO w LU0 c Z 00 W w 0 w 0 J 0 0 w J CO O F- • Z LU w E Lu O LU >'< w LU LU &) COZY J Q. O 0 E U O w = w w o_ om Lu w o_ 0) w 0 J 0 0 w -J REVOCABLE TRUST REVOCABLE TRUST Irrigated pas REC RDE p /N BOOK 87 at PAGE 407 1 SUBDIVISION EXEMPTION RECEPTION #689015 Cerise Mine United Companies Pre Mining Map Permit Number: N/A Mine Center Location: Map Scale: 1" = 100' Latitude: 39° 19' 38" N Longitude: 107° 12' 44" W State: Colorado County: Pitkin Section: 27 Township: 8 South Major Watershed: Crystal River 0' 100' 200' Nearest Town: Carbondale Range: 88 West 300' Legend Permit Boundary Drainage Flow Directions Fences Roads E — E — Overhead Powerlines Parcel Boundaries/Owners Section Lines U Water/Drainages Wetlands 910' Index Topography 912' Intermediate Topography Map Georeferencing Information: Datum: 0 NAD27 ® NAD83 0 WGS84 0 None (Local) Mapping Projection: State Plane:1Z Central Zone❑ North Zone 0 South Zone 0 Other: UTM: ❑ Zone 12 ❑ Zone 13 ❑ Zone 14 ❑ Other: Local System (Name): Units: ® Foot 0 Meter File Name: X:\United Companies\Cerise Mine\AutoCAD\Cerise Pit 25NOV13.dwg Date Plotted: 11/27/13 Notes: Designed: BEL Drawn: BEL Checked: GL Approved: GL Revisions B y Date Greg Lewicki And Associates 11541 Warrington Court Phone (303)-346-5196 Parker, CO USA 80138 E -Mail - info@lewicki.biz 6290, I � E �E _E E E E x e,. - co N co, Phase IB 3.8 Acres Mining and processing area R 8 acres 111111 Phase 1A & 1B verburden 111111 storage .3 Acres M� cv co \ / \/ // / Ws bri- 'x 6' -6200( 210'- s 2$0, _627-0' 220, 6260 6210, 6240, 6250', 6230,, 0x`8641 PAG GA'S 6270 - - - 9G 22 CO. 50� -62601_ 62-7e, 70, 250` Q • Z U W W c • W O LO LU O W • W b W co J O 0 E W =• O ww o_ Cerise Mine United Companies Mining Map 1 Permit Number: N/A Mine Center Location: Map Scale: 1" = 100' Latitude: 39° 19' 38" N Longitude: 107° 12' 44" W State: Colorado County: Pitkin Section: 27 Township: 8 South Major Watershed: Crystal River 0' 100' 200' Nearest Town: Carbondale Range: 88 West 300' Legend — E — E 1 Permit Boundary Fences Overhead Powerlines Mine Facilities Parcel Boundaries/Owners Section Lines Disturbed Boundary U Water/Drainages 910' Index Topography 912' Intermediate i upography Map Georeferencing Information: Datum: 0 NAD27 ® NAD83 0 WGS84 0 None (Local) Mapping Projection: State Plane:1Z Central Zone❑ North Zone 0 South Zone 0 Other: UTM: ❑Zone 12 ❑ Zone 13 ❑Zone 14 ❑ Other: Local System (Name): Units: ® Foot 0 Meter File Name: X:\United Companies\Cerise Mine\AutoCAD\Cerise Pit 25NOV13.dwg Date Plotted: 11/27/13 Notes: Designed: BEL Drawn: BEL Checked: GL Approved: GL Revisions B y Date Greg Lewicki And Associates 11541 Warrington Court Phone (303)-346-5196 Parker, CO USA 80138 E -Mail - info@lewicki.biz O 6' co p 2 (153 / / / / // / / // / / / / / / / e �E _E E E _ E Phase IA& 1 56. co storage .3 acres • F- U w W W U W W w W p W (n e0 Z 15 0 U 0 J O 0W W W d / / cow k2.401 '� 620, 6270 6�6p, -_-- 6240,6250',. 6230, 6280,, RECORDED/ 6270, 6 c° 625 626(r;` 280 Cerise Mine United Companies Mining Map 2 Permit Number: N/A Mine Center Location: Map Scale: 1" = 100' Latitude: 39° 19' 38" N Longitude: 107° 12' 44" W State: Colorado County: Pitkin Section: 27 Township: 8 South Major Watershed: Crystal River 0' 100' 200' Nearest Town: Carbondale Range: 88 West 300' Legend —E --E 1 Permit Boundary Fences Overhead Powerlines Mine Facilities Section Lines Disturbed Boundary L) Water/Drainages .j Wetlands 910' Index Topography 912' Intermediate upography Map Georeferencing Information: Datum: 0 NAD27 ® NAD83 0 WGS84 0 None (Local) Mapping Projection: State Plane:1Z Central Zone❑ North Zone 0 South Zone 0 Other: UTM: ❑Zone 12 ❑ Zone 13 ❑Zone 14 ❑ Other: Local System (Name): Units: ® Foot 0 Meter File Name: X:\United Companies\Cerise Mine\AutoCAD\Cerise Pit 25NOV13.dwg Date Plotted: 11/27/13 Notes: Designed: BEL Drawn: BEL Checked: GL Approved: GL Revisions y Date Greg Lewicki And Associates 11541 Warrington Court Phone (303)-346-5196 Parker, CO USA 80138 E -Mail - info@lewicki.biz / // () - co"cv Co C' 6290, l �, O -^ Q Z U LU w E Q' w O LLJ LU O w• W w o we �Zo O 0 E Lu J • O w CC w d 1 H:1 V sideslopEs with 20' benches e' ery 25 vertical feet. M� cow Rs t/ 'x co 14.0 Acres -6200( X230, —6-2401- Cerise Mine United Companies s2sQ, 6230 Mining Map 3 6210, 6270 626 Permit Number: N/A Mine Center Location: Latitude: 39° 19' 38" N State: Colorado Section: 27 Longitude: 107° 12' 44" W County: Pitkin Township: 8 South Major Watershed: Crystal River Nearest Town: Carbondale Range: 88 West --RE�/vED -6260, 6270, 100' 200' 300' �• NATU 647- PAG 22AS C\ 62§0'- — - 280-x_ - 6266\ Map Scale: 1" = 100' Legend — E - E Permit Boundary Fences Overhead Powerlines Mine Facilities Parcel Boundaries/Owners Section Lines Disturbed Boundary L� Water/Drainages 910' Index Topography 912' Intermediate upography Map Georeferencing Information: Datum: 0 NAD27 ® NAD83 0 WGS84 0 None (Local) Mapping Projection: State Plane:1Z Central Zone❑ North Zone 0 South Zone 0 Other: UTM: ❑ Zone 12 ❑ Zone 13 ❑ Zone 14 ❑ Other: Local System (Name): Units: ® Foot 0 Meter File Name: X:\United Companies\Cerise Mine\AutoCAD\Cerise Pit 25NOV13.dwg Date Plotted: 11/27/13 Notes: Designed: BEL Drawn: BEL Checked: GL Approved: GL Revisions B y Date Greg Lewicki And Associates 11541 Warrington Court Phone (303)-346-5196 Parker, CO USA 80138 E -Mail - info@lewicki.biz i j, E e �E _E E E _ E 6280' -- • Mining and processing are 22.9 Acres co • F-^ Q Z U W w E Q' W O LLJ LU O w• W w aW z▪ o O 0 • J WI • O W W d 620,, M� cow 6 co X 6' `cD0,, 62,30. • • 0 • s 6c.)�0, 6'0' -" 623 628fl/ 6270!__ 626 6210, 6240, 6250' D vQ 6270 • Nq �► 6AT AE22ASC 6250• - 6260' 280-'_ --62_ 6258 Cerise Mine United Companies Mining Map 4 Permit Number: N/A Mine Center Location: Map Scale: 1" = 100' Latitude: 39° 19' 38" N Longitude: 107° 12' 44" W State: Colorado County: Pitkin Section: 27 Township: 8 South Major Watershed: Crystal River 0' 100' 200' Nearest Town: Carbondale Range: 88 West 300' Legend E — E Permit Boundary Fences Overhead Powerlines Mine Facilities Parcel Boundaries/Owners Section Lines Disturbed Boundary L� Water/Drainages 910' Index Topography 912' Intermediate upography Map Georeferencing Information: Datum: 0 NAD27 ® NAD83 0 WGS84 0 None (Local) Mapping Projection: State Plane:1Z Central Zone❑ North Zone 0 South Zone 0 Other: UTM: ❑Zone 12 ❑ Zone 13 ❑Zone 14 ❑ Other: Local System (Name): Units: ® Foot 0 Meter File Name: X:\United Companies\Cerise Mine\AutoCAD\Cerise Pit 25NOV13.dwg Date Plotted: 11/27/13 Notes: Designed: BEL Drawn: BEL Checked: GL Approved: GL Revisions B y Date Greg Lewicki And Associates 11541 Warrington Court Parker, CO USA 80138 Phone (303)-346-5196 E -Mail - info@lewicki.biz co co O co i co co / A r'0' / V I I 11 co X62 QI • F— U W W p'_ I- Q W U O W • W b W U) co Z U 0 J W =O W d 7'� // <oo cart/ i / 0,CO 21 x 6' -6200\ -624 -623 —6-2401- 6220 6f} 6280,, 6240' 62501 210, 6230, Recofi -6260, 6270, Afriv r6�TPgf� GA 9, 6260'- .. -- `6260'= -6290', -62 6260 1 -- Cerise Mine United Companies Mining Map 5 Permit Number: N/A Mine Center Location: Map Scale: 1" = 100' Latitude: 39° 19' 38" N Longitude: 107° 12' 44" W State: Colorado County: Pitkin Section: 27 Township: 8 South Major Watershed: Crystal River 0' 100' 200' Nearest Town: Carbondale Range: 88 West 300' Legend — E — E Permit Boundary Fences Overhead Powerlines Mine Facilities Parcel Boundaries/Owners Section Lines Disturbed Boundary L� Water/Drainages .j Wetlands 910' Index Topography 912-' Intermediate upography Map Georeferencing Information: Datum: 0 NAD27 ® NAD83 0 WGS84 0 None (Local) Mapping Projection: State Plane:1Z Central Zone❑ North Zone 0 South Zone 0 Other: UTM: ❑Zone 12 ❑ Zone 13 ❑Zone 14 ❑ Other: Local System (Name): Units: ® Foot 0 Meter File Name: X:\United Companies\Cerise Mine\AutoCAD\Cerise Pit 25NOV13.dwg Date Plotted: 11/27/13 Notes: Designed: BEL Drawn: BEL Checked: GL Approved: GL Revisions B y Date Greg Lewicki And Associates 11541 Warrington Court Phone (303)-346-5196 Parker, CO USA 80138 E -Mail - info@lewicki.biz E / O co E _ E —E— e / co Oi ti // 6290, 629 co 0.3 co N CO rb CO 29 0Zg® 0g 69 i 6 • F-^ Q Z LU w E • w O LLJ LU O w • J w owe �Z0 J O 0 E O 0 Lu w w o_ t7r/ 7 62301- ;.,_ T0, 6250, 6260, —6230, 6220,_ 6210, Fr27= 6240,625 ' 6260' 0 6230,, R ROG ERIN Q„ TN. T pq �9 GAS CO. 22 6250 290, Cerise Mine United Companies Reclamation Map Permit Number: N/A Mine Center Location: Map Scale: 1" = 100' Latitude: 39° 19' 38" N Longitude: 107° 12' 44" W State: Colorado County: Pitkin Section: 27 Township: 8 South Major Watershed: Crystal River 0' 100' 200' Nearest Town: Carbondale Range: 88 West 300' Legend Permit Boundary ® Drainage Flow Directions Fences E — E Overhead Powerlines Vegetation Type/Boundaries Section Lines L) Water/Drainages Wetlands 910' Index Topography 912' Intermediate i upography Map Georeferencing Information: Datum: 0 NAD27 ® NAD83 0 WGS84 0 None (Local) Mapping Projection: State Plane:1Z Central Zone❑ North Zone 0 South Zone 0 Other: UTM: ❑ Zone 12 ❑ Zone 13 ❑ Zone 14 ❑ Other: Local System (Name): Units: ® Foot 0 Meter File Name: X:\United Companies\Cerise Mine\AutoCAD\Cerise Pit 25NOV13.dwg Date Plotted: 11/27/13 Notes: Designed: BEL Drawn: BEL Checked: GL Approved: GL Revisions B y Date Greg Lewicki And Associates 11541 Warrington Court Parker, CO USA 80138 Phone (303)-346-5196 E -Mail - info@lewicki.biz ATTACHMENT C Noise Level and Sound Power Data for Mining Equipment TABLE C1 Source Noise Data Used for Analysis Equipment Type of Noise Source Point Source PWL (dBA) Source Height (feet) Notes Jaw Crusher point 121 10 Measured 121 dBA, Other Sources 121 dBA Cone Crushers point 115 10 Estimated 6 dB quieter than jaw crusher based on measurements by others. Screens point 113 10 Measured 113 dBA, Other Sources 111 dBA Loaders line 113 7 Measured 113 dBA, Other Sources 110 dBA Scrapers line 115 7 Measured 113 dBA, Other Sources 115 dBA Grader line 115 7 Measured 113 dBA, Other Sources 115 dBA Bulldozer line 114 7 Measured 112 dBA, FHWA Measured 114 dBA, Others 106 to 114 dBA Haul Trucks line 110 7 Measured 108 dBA, Other Sources 110 dBA ATTACHMENT D Predicted Noise Level Contours for Each Mining Map Noise level dB(A) <= 55 55< <=60 60 «= 65 65 < <= 70 70 < <= 75 75 < <= 80 80 < <= 85 85 < CERISE GRAVEL PIT Pre -Mining 5/9/2014 0 Cerise01 O 0 Cerise02 Cerise03 • Fitch 0 Riley 0 Chandler Noise level dB(A) <= 55 55< <=60 60 «= 65 65 < <= 70 70 < <= 75 75 < <= 80 80 < <= 85 85 < CERISE GRAVEL PIT Map 1 5/9/2014 • • Cerise02 Cerise03 • Fitch • Riley • Chandler Noise level dB(A) <= 55 55<=<=60 60 «= 65 65 < <= 70 70 < <= 75 75 <<= 80 80 < <= 85 85 < CERISE GRAVEL PIT Map 2 5/9/2014 • Fitch • Riley • Chandler Noise level dB(A) <= 55 55<=<=60 60 «= 65 65 < <= 70 70 < <= 75 75 <<= 80 80 < <= 85 85 < CERISE GRAVEL PIT Map 3 5/9/2014 • Fitch 0 Chandler Noise level dB(A) <= 55 55<=<=60 60 «= 65 65 < <= 70 70 < <= 75 75 <<= 80 80 < <= 85 85 < CERISE GRAVEL PIT Map 4 5/9/2014 • Fitch • Chandler Noise level dB(A) <= 55 55<=<=60 60 «= 65 65 < <= 70 70 < <= 75 75 <<= 80 80 < <= 85 85 < CERISE GRAVEL PIT Map 5 5/9/2014 • Fitch • Chandler Noise level dB(A) <= 55 55<=<=60 60 «= 65 65 < <= 70 70 < <= 75 75 <<= 80 80 < <= 85 85 < CERISE GRAVEL PIT Map 6 5/9/2014 • Fitch • Cerise0l • • Cerise02 Cerise03 • Chandler Noise level dB(A) <= 55 55<=<=60 60 «= 65 65 < <= 70 70 < <= 75 75 <<= 80 80 < <= 85 85 < CERISE GRAVEL PIT Reclamation 5/9/2014 • Fitch 0 Chandler