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HomeMy WebLinkAbout5.0 Conditions & Correspondencer�sGm April 2, 2013 Mr. Glenn Hartman, Planner Garfield County Building and Planning 108 8th Street, Suite 401 Glenwood Springs, Colorado 81601 RE: Status of Condition Regarding Noise Bedrock Resources — Mamm Creek Property Dear Glenn, As per your request, and per condition 15 of the conditions of approval of the Land Use Change permit as requested of the BOCC for the Bedrock Resources Mamm Creek Property, please note that this letter is intended to serve the purpose, alone, of discussing the status of this permit and how it is intended to be met. From your email to me of March 28, note the following: Condition 15. Please provide an update of the noise study incorporating the supplemental noise letter from Engineering Dynamics Incorporated (dated 7/10/12). My review of the existing updates and original report noted that the following would address the condition: a) an updated diagram showing the location of the crushing activity relative to the property lines (i.e. distances); b) an updated listing showing the noise calculations based on the new diagram/distances; and c) a conclusion/summary detailing all of the mitigation installations (berms, etc.) that will or are already installed to achieve compliance with State and County Standards including the "closest residential property". The summary of mitigation installations is one of the key intents of the condition to make it straightforward for both the Applicant and the County to confirm future compliance. This condition has been completed as was reviewed with the BOCC review of the application and with the testimony provided therein. I have attached the copies of correspondence for this issue to clarify how mitigation of noise is to occur. My July 9, 2012 correspondence identifies the location of the crushing operations evaluated by Howard McGregor in his updated noise study and as referenced in his subsequent July 10, 2012 letter. In his letter, Howard notes the conditions that are required to exist to commence the crushing operations in order to be compliant with the state noise requirements. It is the intent to comply with these conditions. The summary of the mitigation installations therefore are listed as follows: 1. Install the berm(s) along the east property lines as shown on the grading plan. These have been completed. 2. Prior to crushing, locate a 12 foot high berm (of material to be crushed) between the crusher and the roadway to the shop and storage building as well as the north property line (adjacent residence). This berm location (of material to be crushed) will be GLENWOOD SPRINGS 118 West Sixth St, Suite 200 1 Glenwood Springs, CO 81601 1 970.945.1004 r�. SGM sufficient to reduce the noise levels of the crusher to Tess than 55 dB at both the east and north property lines. As you are aware, the distance from the crusher to the north property line is 750 feet. By Howard's noise reduction table and the report, the 750 foot distance reduces the 73 dB to 56 dB. By adding the berm of crushed (and uncrushed material), the reduction is further reduced to 49 dB at the north property line. Assuring the crushing operations maintain a berm between the crusher and the north and east property lines will occur each time there are crushing operations intended. Staging of uncrushed material with newly crushed material will be performed in such a manner as there will always be a secondary berm between the crusher and the east and north property lines. Hopefully this information adequately addresses your conditions update request. Upon your receipt and review, if you have any questions, please don't hesitate to contact me. Respectfully, SGM-Inc. Jefferey S. Simonson, PE, CFM Principal Cc: Charlie Elsworth Damian Elsworth .-. -w... nm row .w •..,,, nm r r w ra.+r.•++-nr. July 10, 2012 Mr. Jeffrey Simonson Schmuesen, Gordon, Meyer, Inc. 118 West 6'h Street, Suite 200 Glenwood Springs, CO 81601 Re: Inclusion of Rock Crusher in Bedrock Resources Frontier Paving Contractor's Yard Dear Mr. Simonson: r engineering dynamics ed I incorporated Page 1 of 1 (V) 970.379.4691 (Cell) 970.379.4691 JeffS a(�sgm-inc.com EDI Job No. C3918 References: 1. Engineering Dynamics Inc. Report: dated February 2012 titled "Noise Assessment Bedrock Resources Inc. Asphalt Batch Plant, Garfield County, Colorado, Job No. C3918. 2. Pre -Application Conference Summary, dated 3/20/12 Project: Frontier Paving Contractor's Yard 3. Engineering Dynamics Inc. Letter report dated April 20, 2012 titled "Bedrock Resources Frontier Paving Contractor's Yard. Table 2 in the April 30, 2012 letter addresses the noise sources that would be in Frontier Paving Contractor's Yard. Not included in that table was the noise emission of the crusher, which most recently has been included as an additional piece of equipment in the Contractor's Yard. The crusher will be used occasionally to process road material (asphalt black top). As presented in Table 2, the crusher produces 73 dB(A) at 100 ft. and 65 dB(A) at the closest property line; 250 ft. to the northeast when there is no noise mitigation whatsoever between the crusher and the property line. There is a berm located beyond the ditch which will initially reduce the crusher noise level at the property by 5 dB(A) making the noise level at the property line 60 dB(A), which means that an additional 5 dB(A) noise reduction is required in order to keep the noise level below the 55 dB(A) limit. Before crushing takes place salvaged roadway asphalt will be dumped from the service road onto an area between the service road and the crusher. Some of the material will be left in place to form a second 12 ft. high noise barrier berm. This berm will provide a 6 dB(A) reduction and the noise level at the property line will be less than 55 dB(A). Additional noise reduction of 5 dB(A) can also be achieved by locating the crusher at the south corner of the storage area. Sincerely, ENGINEERING DYNAMICS, INC. a— Howard N. McGregor, P.E. President 3925 south kalamath street • englewood, colorado 80110 • 303.761.4367 • Fax 303.761.4379 April Mr. Schmuesen, 118 Glenwood Re: Dear References: Table Processing Contractor's Table Yard. last that sum It can longer Sincerely, President 30, 2012 Jeffrey Simonson Gordon, Meyer, Inc. West 6th Street, Suite 200 Springs, CO 81601 Bedrock Resources — Frontier Paving Contractor's Yard Mr. Simonson: 1. Engineering Dynamics Inc. Report: dated February 2012 titled "Noise Assessment Bedrock Asphalt Batch Plant, Garfield County, Colorado, Job 2. Pre-Application Conference Summary, dated 3/20/12 Project: Frontier Paving Contractor's Yard 2 in reference 1. above lists the noise producing equipment that would Plant. The Applicant is now proposing to eliminate the asphalt Yard. ■ engineering dynamics ed 1incorporated Page 1 of 1 a (V) 970.379.4691 (Cell) 970.379.4691 JeffS(asgm-inc.com Resources Inc. No. C3918. be at the Applicant's Asphalt plant and to use the area as Table 2 Equipment Inventory Description Mfg I.D. Equipment Function dB(A) @ 100 ft. Asphalt Plant Contractor's Yard Wheel Loader Volvo L-12OE Bin and Hopper Loading 74 -- Motor Grader Volvo G746B On—Site Roadway 70 70 LD8 Dozer Deere 850J Stockpiling Dust Control 74 65 74 65 Water Truck Asphalt Plant Burner Product Production 73 -- Loader Silo Dumping Hot Asphalt 73 -- Generator CAT 540 KW Power for Asphalt Plant 72 -- Crusher Rock Sizing 73 -- Screens Sizing 73 -- Stacker Stock Piles 65 -- Conveyor Feeder to Plant/Stock Piles 61 -- Generator CAT 480 KW Power for Conveyor/Stackers 72 -- Haul Truck Misc. Belly Dump 70 70 Haul Truck Misc. Tandem Dump 70 70 Backup Alarm BRS 107 White Noise Backup Alarm 68 68 Sum 83 78 2 now identifies those noise producing equipment that will be in operation at the proposed Contractor's It can be seen that the equipment that will no longer be used are some of the loudest noise sources. The column of Table 2, which has been added to the original Table 2 presents the noise level of the equipment will be retained for usage at the proposed Contractor's Yard. In the last (new bottom row of Table 2) is the of all of the noise sources for the previously proposed asphalt plant and the now proposed Contractor's Yard. be seen that the overall noise level has been reduced by 5 dB(A). Also, besides the asphalt plant there no will be any highway trucks hauling loads of asphalt from the site. 3925 south kalamath street • englewood, colorado 80110 • 303.761.4367 • Fax 303.761.4379 NOISE ASSESSMENT BEDROCK RESOURCES, INC. ASPHALT BATCH PLANT GARFIELD COUNTY, COLORADO Prepared by: February 2012 Howard N. McGregor Registered Professional Engineer State of Colorado License No. 3928 d a engineering e/ dynamic incorporated Page 1 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 r engineering dynamics ,incorporated FOREWORD This noise assessment report was prepared for Bedrock "Resources Inc. under the direction of Charles Ellsworth of Frontier Paving. Specifically, this report addresses the noise emission from an asphalt batch plant and associated support equipment. The asphalt plant is to be located on the upper bench of the Bedrock Resources property. The mining plan including drawing and maps necessary for the preparation of this Noise Asse4ssment Report were provided to Engineering Dynamics Inc. by Schmueser, Gorden, Meyer Inc., 118 W 5th Street, Glenwood Springs, Co. Engineering Dynamics Inc. has prepared noise impact assessment analyses and reports for the surface and underground mining industry since 1972. All of the work report herein was performed by Mr. McGregor or under his direct supervision. Howard N. McGregor is a registered professional engineer licensed to practice engineering in the State of Colorado. Mr. McGregor holds Colorado License Number 3928, which was obtained by examination. Page 2 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 ■ ■ • ■ engineering edir. dynamics incorporated TABLE OF CONTENTS Page FOREWORD 2 TABLE OF CONTENTS 3 I. INTRODUCTION 4 II. APPLICABLE LAWS, REGULATIONS AND ORDINANCES A. Community Noise 5 B. State of Colorado Noise Law 5 C. Garfield County 5 D. Zoning of Adjacent Land 6 III. EQUIPMENT INVENTORY AND NOISE EMISSION LEVELS 7 IV. EQUIPMENT NOISE CONTROL DURING CONSTRUCTION AND ASPHALT PRODUCTION A. Stationary Equipment Sequence and Noise Emission 8 B. Site Map and Cross Section 8 C. Cross Section — Noise Analysis 8 D. Mobile Equipment 10 V. NOISE MITIGATION PLAN 12 VI. CONCLUSIONS AND RECOMMENDATIONS 13 FIGURES Figure 1 - Cross Section Locations 14 Figure 2 — North Cross Section 15 Figure 9 — Northwest Cross Section 16 Figure 8 — West Cross Section 17 Figure 7 — Southwest Cross Section 18 Figure 6 — South Cross Section 19 Figure 5 — Southeast Cross Section 20 Figure 4 — East Cross Section 21 Figure 3 — Northeast Cross Section 22 Page 3 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 r engineermicsing dyna CAI I incorporated I. INTRODUCTION The Applicant, Bedrock Resources, is planning to locate an asphalt plant on the upper bench of the Bedrock Resources property. Associated with the asphalt plant is on-site stationary and mobile equipment, and arriving and departing highway trucks; those of Bedrock Resources and others. The highway trucks will enter and exit the site via an on-site road going onto CR315 and north to 1-70, a few trucks may go south on CR315 but the majority will go to I-70. Once the highway trucks are on CR315 or 1-70, they will be subjected to the noise limits detailed in CRS 25-12-106/107. When on the site, the highway trucks are considered a fixed noise source along with all of the other equipment on the site and are considered as a part of the overall noise emitting from the site in accordance with CRS 25-12-103. All of the properties abutting to the site are zoned rural/ agricultural/residential and the noise limit of 25 ft. beyond the property is 55 dB(A) during the daytime. Applicable noise laws or regulations will be discussed in Section 11 of this report which follows. Page 4 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 engineering dynamics e incorporated II. APPLICABLE LAWS, REGULATIONS AND ORDINANCES THEREOF A. Community Noise Community noise has been addressed by the Federal Government starting with the U. S. Environmental Protection Agency, (EPA) "Noise Control Act of 1972". In concert with that act, state and local governments have enacted laws or ordinances regulating noise emission levels. Furthermore, these laws clearly define measurement methodology and decibel limits in scientific terms. Some laws do, however, include subjective assessments which are outside of rigorous scientific evaluation and for this reason can be highly variable. Subjective assessments or considerations will not be addressed in this report. B. State of Colorado Noise Law Section 25-12-103. Maximum Permission Noise Levels §(1) Every activity to which this article is applicable shall be conducted in a manner so that any noise produced is not objectionable due to intermittence, beat frequency, or shrillness. Sound levels of noise radiating from a property line at a distance of twenty-five feet or more therefrom in excess of the dB(A) established for the following time periods and zones shall constitute prima facie evidence that such noise is a public nuisance: §(2) In the hours between 7:OOam and the next 7:OOpm, the noise levels permitted in subsection (1) of this section may be increased by ten dB(A) for a period of not -to -exceed fifteen minutes in any one-hour period. §(3) Periodic, impulsive, or shrill noises shall be considered a public nuisance when such noises are at a sound level of five dB(A) less than those listed in subsection (1) of this section. §(5) Construction projects shall be subject to the maximum permissible noise levels specified for industrial zones for the period within which construction is to be completed pursuant to any applicable construction permit issued by proper authority or, if no time limitation is imposed, for a reasonable period of time for completion of project. Section 25-12-104 Action to Abate The entire section was amended in 2008 and effective August 5, 2008. The last sentence of this section reads: The court may stay the effect of any order issued under this section for such time as is reasonably necessary for the defendant to come into compliance with the provisions of this article. Note: If for some reason that is unknown at this time the noise emission from the plant exceeds 55 dB(A). The Applicant may request a reasonable amount of time for mitigation. C. Garfield County Garfield County has no ordinance or regulation addressing noise and relies upon the Colorado Revised Statutes, Title 25, Article 12, Noise Abatement for determination of compliance. Page 5 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 Maximum Allowable Noise Levels Zone 7am to next 7pm 7pm to next 7am Residential 55 dB(A) 50 dB(A) Commercial 60 dB(A) 55 dB(A) Industrial 80 dB(A) 75 dB(A) Light Industrial 70 dB(A) 65 dB(A) §(2) In the hours between 7:OOam and the next 7:OOpm, the noise levels permitted in subsection (1) of this section may be increased by ten dB(A) for a period of not -to -exceed fifteen minutes in any one-hour period. §(3) Periodic, impulsive, or shrill noises shall be considered a public nuisance when such noises are at a sound level of five dB(A) less than those listed in subsection (1) of this section. §(5) Construction projects shall be subject to the maximum permissible noise levels specified for industrial zones for the period within which construction is to be completed pursuant to any applicable construction permit issued by proper authority or, if no time limitation is imposed, for a reasonable period of time for completion of project. Section 25-12-104 Action to Abate The entire section was amended in 2008 and effective August 5, 2008. The last sentence of this section reads: The court may stay the effect of any order issued under this section for such time as is reasonably necessary for the defendant to come into compliance with the provisions of this article. Note: If for some reason that is unknown at this time the noise emission from the plant exceeds 55 dB(A). The Applicant may request a reasonable amount of time for mitigation. C. Garfield County Garfield County has no ordinance or regulation addressing noise and relies upon the Colorado Revised Statutes, Title 25, Article 12, Noise Abatement for determination of compliance. Page 5 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 dI e dynamics ncorporated D. Zoning of Adjacent Land Distances used in this section of this report were taken from Schmueser, Gordon, Meyer, Bedrock Resources, Overall Site Plan, Sheet 3 dated 10/14/11. The following distances are from the highway haul truck loading silo, which along with the asphalt plant, are the loudest noise sources that will be in almost continuous operations. Table 1 which follows presented the direction and distances to the property line as taken from the Overall Site Plan, Figure 1. North Northwest West Direction Table 1 Distances from Centeral Processing Equipment to Bedrock Resources Pro•ert Line Distance -ft. 874 1247 Southwest South 698 563 Southeast East 386 542 Northeast 616 420 * Rural/Agricultural/Residential Zoning R/A/R* R/A/R* R/A/R* R/A/R* R/A/R* R/A/R* R/A/R* R/A/R* Page 6 of 22 No.EDI Job C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax 303-761 4379 III. a engineering dynamics eCI. Incorporated EQUIPMENT INVENTORY AND NOISE EMISSION LEVELS Table 2 presents a listing of on-site equipment including description, manufacturer, function and noise emission level expressed in A-weighted decibels. Also, present are typical noise emission levels for highway haul trucks that will haul the asphalt product to market. Table 2 Equipment Inventory Description Mfg. I.D. Equipment Function dB(A) 100 ft. Wheel Loader Volvo L-12OE Bin and Hopper Loading 74 Motor Grader Volvo G746B On-site Roadway 70 Dozer Deere 850J Stockpiling 74 Water Truck Dust Control 65 Asphalt Plant Burner Product Production 73 Loader Silo Dumping Hot Asphalt 73 Generator CAT 540 KW Power for Asphalt Plant 72 Crusher Rock Sizing 73 Screens Sizing 73 Stacker Stock Piles 65 Conveyor Feeder to Plant/Stock Piles 61 Generator CAT 480 KW Power for Conveyor/Stackers 72 Haul Truck Misc. Belly Dump 70 Haul Truck Misc. Tandem Dump 70 Backup Alarm BRS 107 White Noise Backup Alarm 68 The noise emission levels presented in Table 2, especially those for the mobile equipment such as the dozer and front end loader, are maximum noise levels coming from the noisiest end of the equipment. Also, these maximum levels are those occurring when the equipment is at maximum rpm and load. Haul truck levels are those occurring during drive-by on the highway at 35 mph. Truck noise decreases as speed is reduced. Table 3 Noise Reduction with Distance based upon 100 ft. Data Distance — Ft. Reduction — dB(A) 100 0 200 -6 400 -12 800 -18 1000 -20 1600 -24 The decibel levels occurring at 100 ft. as listed in Table 2 can be reduced in value for distances greater than 100 ft. using the values presented in Table 3. The reduction values listed in Table 2 do not include the effects of terrain, vegetation, vertical thermal gradients and wind which can reduce noise levels by as much as 5 to 10 dB(A) Table 3 above, may be used as a rule of thumb for rapidly estimating noise level changes as a function of distance. However, the exact calculation of the noise level at any distance, over any terrain, and the effect of noise barriers or walls requires detailed engineering calculations. Page 7 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 al engineering editindynamics corporated IV. EQUIPMENT NOISE CONTROL DURING CONSTRUCTION AND ASPHALT PRODUCTION A. Stationary Equipment Sequence and Noise Emission Raw rock, gravel and sand product will be taken from the crusher fines, natural fines and % rock storage areas. The products will then be taken by a loader and dumped into one or more of the storage bins. From the bins, the raw product will be transferred to an asphalt drum via a conveyor. The ground level of the bins is about 10 ft. higher than the ground level of the drum. This difference in elevation is because the drum, bag house and crusher are setting in an area that has been excavated to about 10 ft. below grade. This lower grade level provides a 10 ft. high noise barrier to the south and east of the equipment. Directly south of the processing area there are the generator fuel storage tanks which will also act as a noise barrier. To the east of the processing area, there are three product storage stockpiles. All three are 25 ft. above grade and provide a noise barrier to the east. Stockpiles of products have been shown to reduce noise level by as much as 25 dB. B. Site Map and Cross Section Topographical cross sections have been prepared showing the elevations in eight directions; north, northeast, east, southeast, south, southwest, west and northwest. The distances to the property lines in each of these directions have been presented in Table 1 on page 6 of this report. A site plan view is presented in Figure 1 showing the location of the eight cross sections which all have an origin at the loading silo. The cross sections are presented in Figures 2, 3, 4, 5, 6, 7, 8 and 9. The silo location has been used as the point of origin for all of the cross sections. It can be seen in Table 4 that the shortest direction is to the south where the distance is 386 ft. The decibel reduction to the 100 ft. decibel due to distance along is 12 dB(A). The greatest distance is 1247 ft and the decibel reduction is 22 dB(A). For convenience, Figure 2, 3, 4, 5, 6, 7, 8 and 9 have also be identified by their direction. An analysis of each of the eight cross sections follows. Table 4 Distances from Centeral Processing to Bedrock Resources Property Equipment Line dB Reduction due to Distance 100' dB Values Direction Distance ft. North 874 19 Northwest 1247 22 West 698 17 Southwest 563 15 South 386 12 Southeast 542 15 East 616 16 Northeast 420 12 C. Cross Sections — Noise Analysis All of the cross section analyses which follow will use a noise source decibel level of 78 dB(A) at 100 ft. This value is assuming that the following equipment is at its maximum noise emission level and located at or near to the loading silo which is the zero or starting point of all of the cross sections. • Loading Silo • Drum • Bag Houses • Generator • Loader Page 8 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 1. North Distance to property line 874 Reduction due to distance 19 Additional reductions a. Unprocessed asphalt 10 b. Edge of berm 3 Total 32 dB(A) at Property Line 46 2. Northwest Distance to property line 1247 Reduction due to distance 22 Additional reductions a. Berm 24 Total 46 dB(A) at Property Line 32 Note: 24 dB(A) reduction is calculated limit 3. West Distance to property line Reduction due to distance Additional reductions a. Berm Cuts 698 17 24 ■ engineering dynamics e ,incorporated Actual reduction value about 30 dB(A). Total 41 dB(A) at Property Line 37 Note: 24 dB(A) reduction is calculated limit . Actual reduction value about 30 dB(A). 4. Southwest Distance to property line Reduction due to distance Additional reductions a. Berm and Cut 563 15 24 Total 39 dB(A) at Property Line 39 Note: 24 dB(A) reduction is calculated limit . Actual reduction value about 30 dB(A). 5. South Distance to property line 386 Reduction due to distance 12 Additional reductions a. Berm 24 b. --- c. --- Total 36 dB(A) at Property Line 42 Note: 24 dB(A) reduction is calculated limit . Actual reduction value about 30 dB(A). Page 9 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 tengineering na edi incorpdyorotedmics 6. Southeast Distance to property line 542 Reduction due to distance 15 Additional reductions a. Berm 24 Total 39 dB(A) at Property Line 39 Note: 24 dB(A) reduction is calculated limit . Actual reduction value about 30 dB(A). 7. East Distance to property line 616 Reduction clue to distance 16 Additional reductions a. Stockpiles 6 b. Road 3 Total 25 dB(A) at Property Line 53 Note: Minimum noise reduction value given to stockpiles. 8. Northeast Distance to property line 420 Reduction due to distance 12 Additional reductions a. Berm 24 Total 36 dB(A) at Property Line 42 Note: 24 dB(A) reduction is calculated limit . Actual reduction value about 30 dB(A). D. Mobile Equipment During construction of the Bedrock Resources' Asphalt Plant the noise limits are allowed to be those for an industrial zone of 80 dB(A) daytime and 75 dB(A) nighttime during a reasonable period of time. The Applicant has estimated the construction of the plant, associated service buildings and roads will take about one month after which the noise limits go to those specified for residential zoning. During construction the mobile equipment will be in operation during the daylight hours; two additional mining hours, which were approved by Garfield County, making the time for construction and production from 5:OOam to 7:OOpm. There will be no construction during the nighttime hours. Construction equipment and noise emission levels at 100 ft. are presented in Table 5 along with the distance to the 80 dB(A) and 55 dB(A) noise levels. Table 5 Mobile Equipment Used during Construction Description Function dB(A) @ 100 ft. Line -of -Sight 80 dB(A) 55 dB(A) Loader Plant Site Prep. 74 50 ft. 891 ft. Dozer Plant and Road Prep 74 50 ft. 891 ft. Motor -grader Road Grading 70 32 ft. 562 ft. Water Truck Dust Control 65 17 ft. 316 ft. The data presented in Table 5 above shows that during the construction phase of the asphalt plant, the construction equipment will not exceed the 80 dB(A) noise limit except close to the intersection of the on-site road, Frontier Lane, with CR315. At that location the noise level does extend beyond the Page 10 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 engineering dynamics e ® incorporated property line at the intersection. In fact, some of the access road construction equipment may be working beyond the property and on CR315. D. Crusher and Generator There will be a crusher and a diesel generator that will provide electric power to the crusher. The crusher will be used to work unprocessed asphalt and concrete. Both the crusher and generator will produce a noise level of 76 dB(A) at 100 ft. This operation will occur every two years for a period of two weeks. Once the material has been crushed, it will be transported by conveyor to the Processed Black Base stockpile. When not in use at Bedrock, both the crusher and generator may be in operation at other processing plant in the region dependent upon market requirements. Page 11 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 da engineering e ,incorporated dynamics V. NOISE MITIGATION PLAN Noise measurements will be taken at the existing Bedrock Resources Asphalt Plant to the extent possible before the plant is shut down and moved to the new location. The noise emission data for the mobile equipment such as loaders, dozers and grader is available from on-site measurements taken by Engineering Dynamics Inc. at other locations. On the other hand, noise emission data of stationary equipment can be incorrect because of modification and changes to stationary equipment that has been in use for many seasons and locations. For this reason, noise measurements will be taken of stationary equipment as soon as it can be turned on. If, for some reason, the noise emissions exceed those used in this analysis then that portion of the analysis will be repeated to determine if there is a significant change in the distance to the 55 dB(A) noise level. If there is, then methods of noise reduction will be started. Changes could range from increasing the height of stockpiles to replacing components on the stationary equipment. For example, Engineering Dynamics Inc. measured the noise emissions from an asphalt drum burner and found out that a significant noise reduction could be obtained by replacing the burner assembly with a newer model that was about 3 dB(A) quieter. A reduction as small'as 3 dB(A) will pull in the 55 dB(A) distance by a factor of 0.7. Other areas were noise reduction can be readily achieved is putting high performance mufflers on the diesel/generator and silencers on the fans and blowers. Reduction as great as 10 dB(A) can b achieved with such devices. Page 12 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 ■ ■ ■ ■ engineering edi dynamics incorporated VI. CONCLUSIONS AND RECOMMENDATIONS • The noise sources at the proposed Bedrock Resources site will consist of equipment and machinery associated with site development, asphalt production and haul truck product transportation. • Bedrock Resources will take the necessary steps to ensure that the equipment and machinery used at the Bedrock Site will be in compliance with applicable noise control requirements. • The State of Colorado Noise Law (CRS 25-12) is applicable to this project and requires that the noise level of adjacent zoned property not exceed 55 dB(A) during the daytime with a variance that daytime operations can start at 5:OOam. • Customer vehicles which are observed to be excessively noisy may be subjected to drive-by noise tests. Customer truck drivers will receive training regarding safety, community relations and noise standards for Bedrock Resources' operation. They will be given notice that drivers failing to abide by these standards will be suspended from hauling material from the Bedrock Resources' facility. • The additional truck traffic associated with the Bedrock Resources project will not significantly increase the existing noise contours on 1-70. As traffic volume increases on 1-70 from other sources, the noise contours from that traffic will increase and the effect of haul truck noise from Bedrock Resources Asphalt Plant will become a smaller percentage of the total noise. • Sound barriers consisting of stockpiles or berms may be installed around or near noise sources such as crushers, screens, conveyors, transfer points and the asphalt plant. • Property line noise measurements will be taken when the plant is in operation and the results reported. Daytime noise emission, if any, in excess of 55 dB(A) at the measurements sites will be corrected in a timely manner. Equipment maintenance will be done outside the hours of operation and will always be less than 50 dB(A) at the property line. • Backup warning devices may be the new approved white noise generators. These devices produce a noise that is not as audible as the traditional backup beeper at distances greater than several hundred feet. • During construction of the asphalt plant and associated facilities, the 80 dB(A) noise limit at the property line is the applicable limit, CRS 25-12-105 (5). Construction is anticipated to take less than one month. Page 13 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 dIN engineering eiiinc\odrpoaramtedics a t4rr14,1,,,;411111, q z." Page 14 of 22 EDI Job No. C3918 3925 S. Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 engineering dynamics edl incorporated ii-gbas6tewi.eabe t tl 29 t t Intl ni' 1 t 1'1 '2 2gggit Ei:tEE.N.; !minks Ist tiiiirt.fria3=es4112er.r.,:vog 4r t sr .•rp,. Page 15 of 22 EDI Job No. C3918 3925 S. 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Kalamath St., Englewood, Colorado 80110 • voice: 303-761-4367 • fax: 303-761-4379 ■ r ■ r ■ r April 2, 2013 Mr. Glenn Hartman, Planner Garfield County Building and Planning 108 8th Street, Suite 401 Glenwood Springs, Colorado 81601 RE: Status of Conditions Bedrock Resources — Mamm Creek Property Dear Glenn, As per our meeting of yesterday coupled up with your follow up email of this date, I am providing this letter with the appropriate attachments to update you on the status of the conditions associated with the Bedrock Resources Land Use Change Permit for their Mamm Creek property just east of the Garfield County airport. Please note your comment with the update as follows: Condition 4. Please confirm that re -vegetation is scheduled for this spring or was already implemented last fall. Note that the roadway is complete from CR 215 up to the upper bench. Accordingly, the re -vegetation associated with that particular improvement is complete. Seed has been placed and mulch blankets top the seed to hold it in place. Realize that there are improvements yet to be constructed for the rest of the site and that there will be additional disturbances accordingly. As a result, the continued implementation of storm water best management practices will continue to the completion of the project and until the maturity of vegetation with 70% coverage has occurred. As improvements are completed, the associated disturbances to construct those improvements will be provided with the appropriate re -vegetation at the optimum timing (assuring success of re -vegetation by planting in late fall or early spring). Condition 6. Please confirm the status of your Access Permit with the County Road and Bridge Department. If there are any improvements remaining to be completed please indicate timing. This condition has been completed. Condition 12. Please provide a copy of a service agreement or similar confirmation (email) that Holy Cross will provide service to the site. Please see the attached email correspondence from Kenton Berner of Holy Cross Energy. In short, HCE has the capacity to serve the intended use. A service agreement will be executed at the time Bedrock Resources needs the service via building permit for any of the proposed buildings. GLENWOOD SPRINGS 1 18 West Sixth St, Suite 200 1 Glenwood Springs, CO 81601 1 970.945.1004 sam Condition 16. Please provide documentation of compliance with the requirement that "Supplemental dust mitigation for the stockpiled materials and crushing shall be included in the dust mitigation plans" . An excerpt from updated dust mitigation plans would be sufficient. The following is an excerpt from the dust mitigation plan discussed in our July 5, 2013 letter to you: "A further clarification is requested from you as to the particulate matter expected to be generated from the asphalt base piles. It should be noted that the particulate matter to be generated will be that of the clay soil particles that exist in the gravel that becomes mixed with the asphaltic concrete when excavated. The asphalt binder in the mix is not expected to contribute to the particulate matter due to the fact that it has been bound to the various particles during its initial "manufacturing" phase and, in fact, will help to bind to some of the clay particles that may come with the base. In any case, during the crushing operations of the unprocessed base, water is to be used in the operation to mitigate dust and, thus, the production of particulate matter. The very nature of adding water to the soils to mitigate dust is to enhance the weight of the particles by increasing density, surface tension and cohesiveness of the particles with adjacent particles. This is the same end result already achieved by the asphalt binder when the asphaltic concrete was manufactured." Condition 18. Please confirm the current status of dust mitigation for the drivable surfaces that are unpaved. Note that the roadway, as constructed has been surfaced with black base that does not create dust when driven on. For other gravel or "dirt" areas still subject to traffic and future access for construction, a water palliative will be applied as needed to mitigate dust. Condition 19. Please confirm the timing for installation of the contact information sign. The contact information sign will be installed at the time just prior and as a condition of the request for a certificate of occupancy. Hopefully this information adequately addresses your conditions update request. Upon your receipt and review, if you have any questions, please don't hesitate to contact me. Respectfully, SGM-Inc. Jefferey S. Simonson, PE, CFM Principal Cc: Charlie Elsworth Damian Elsworth Jeff Simonson From: Kenton Berner <kberner@holycross.com> Sent: Thursday, March 28, 2013 12:43 PM To: Jeff Simonson Subject: RE: Frontier Paving - Mamm Creek Jeff, Good afternoon, Thank you and Yes it is, and I hope all is well with you! From the load forms and conditions that Frontier Paving need at the time we could install overhead transformers and meet their needs. If someone else or a larger building goes in with different requirements Holy Cross Energy would require new Load Forms providing the types of loads required, P.S. as long as it is not three phase we should be fine!! © Kenton From: Jeff Simonson [mailto:JeffS@ sam-inc.com1 Sent: Thursday, March 28, 2013 12:21 PM To: Kenton Berner Subject: Frontier Paving - Mamm Creek Hi Kenton, haven't touched base with you for a while. Hope things are going well. I am hoping you can help me with an email reply to this email. We are trying to wrap up all of our conditions to get our land use change permit from the county on the Frontier Paving Mamm Creek Property. It was also known as Bedrock Resources. What Glenn is wanting is confirmation that Holy Cross will be able to provide service to the site and that there is adequate power and facilities (i.e, we don't need to install a new transmission main/primary in) available when Frontier Paving (or a successor) makes and application for service. Of course, we are talking about a shop, office and storage building area. I suspect there will be no larger than a 200 amp service at the shop and a 200 amp service at the office. Thanks! Jeff 1 Glenn Hartmann From: Jeff Simonson [JeffS@sgm-inc.com] Sent: Tuesday, October 09, 2012 8:22 AM To: charles@FrontierPavinglnc.com; damian@FrontierPavinglnc.com Cc: dsmith@garfieldhecht.com; Glenn Hartmann Subject: FW: Frontier Paving/Bedrock Resources Hi Charlie, After sending on the legal description for the existing easement, I received the following email from Kenton with Holy Cross Energy. It seems that since we are not changing any power pole alignments that they do not need to expand the width of the easement to 30'. It looks like we can knock the HCE condition off of your resolution. Thanks! Jeff From: Kenton Berner [mailto:kberner@holycross.com] Sent: Tuesday, October 09, 2012 7:42 AM To: Jeff Simonson Subject: RE: Frontier Paving/Bedrock Resources Good Morning Jeff, I spoke with the powers of being here at Holy Cross Energy, they have decided that there has been no change to the "existing " power line, therefore there is no need to request a larger easement.. Thank You Jeff Kenton Berner From: Jeff Simonson Jmailto:JeffS@sgm-inc.coml Sent: Monday, October 08, 2012 4:58 PM To: Kenton Berner Cc: damian@FrontierPavingInc.com; charles@FrontierPavingInc.com Subject: RE: Frontier Paving/Bedrock Resources Hi Kenton, Thanks for discussing this with me today. After our phone call, I went over to the Courthouse to get the legal description on the existing easement as described on the attached plat. The intent is to dedicate back to HCE the total 30' easement over the existing 20' easement described at page 274 of book 450 as referenced on Sam Phelps survey. Hopefully, this all works. Thanks, Jeff From: Jeff Simonson Sent: Friday, September 14, 2012 11:31 AM 1 To: 'kberner@holycross.com' Cc: 'damian@FrontierPavingInc.com'; 'charles@FrontierPavingInc.com' Subject: Frontier Paving/Bedrock Resources Hi Kenton, I have attached your January correspondence to Charlie Ellsworth regarding the Bedrock Resources electric service, power line relocation and easement dedication. I have done this so as to refresh your memory as to the previous direction of the project and "where we left off'. We finally have received an approval from Garfield County and need to, at a minimum, dedicate the existing power line easement as being a 30' wide easement versus the current 20' wide easement. The previous plan for relocation of the power lines has changed. We do not need to relocate them. We have removed the asphalt plant from the application and will only have the office, shop and storage buildings. So there will be a need for future electric service to each of these. I left a voice mail to discuss the "next steps" with you and to see what other information you may need. Regardless, we may need to get together to help you clearly understand what is now proposed. Please give me a call at your earliest opportunity to discuss. Thanks! Jeff 945-1004 or 384-9005 (office numbers) 379-4691- cell 2 Glenn Hartmann From: Jeff Simonson [JeffS@sgm-inc.com] Sent: Wednesday, January 02, 2013 2:42 PM To: charles@FrontierPavinglnc.com; Glenn Hartmann Cc: damian@FrontierPavinglnc.com Subject: Mamm Creek Property Attachments: 2012-anm-2454-oe.pdf; 2012-anm-2455-oe.pdf; 2012-anm-2456-oe.pdf; 2012-anm-2457- oe. pdf Hi Charlie and Glen, I wanted to forward the following "findings of no significant impact" from FAA for the Mamm Creek property. You will find attached the PDF's of those findings attached. Please call with any questions! Thanks! Jefferey S. Simonson, PE, CFM Principal 6SGM 118 W. 6th Street, Suite 200 Glenwood Springs, CO 81601 (970) 384-9005/(970) 379-4691 cell www.sgm-inc.corn ® CI 1 Mail Processing Center Federal Aviation Administration Southwest Regional Office Obstruction Evaluation Group 2601 Meacham Boulevard Fort Worth, TX 76137 Issued Date: 11/26/2012 Charles Ellsworth Bedrock Resources, LLC. 1014 County Road 311 New Castle, CO 81647 Aeronautical Study No. 2012-ANM-2454-OE ** DETERMINATION OF NO HAZARD TO AIR NAVIGATION ** The Federal Aviation Administration has conducted an aeronautical study under the provisions of 49 U.S.C., Section 44718 and if applicable Title 14 of the Code of Federal Regulations, part 77, concerning: Structure: Building NE Corner of Storage Bldg Location: Rifle, CO Latitude: 39-31-33.26N NAD 83 Longitude: 107-42-11.44W Heights: 5570 feet site elevation (SE) 25 feet above ground level (AGL) 5595 feet above mean sea level (AMSL) This aeronautical study revealed that the structure does not exceed obstruction standards and would not be a hazard to air navigation provided the following condition(s), if any, is(are) met: It is required that FAA Form 7460-2, Notice of Actual Construction or Alteration, be e -filed any time the project is abandoned or: At least 10 days prior to start of construction (7460-2, Part I) _X_ Within 5 days after the construction reaches its greatest height (7460-2, Part II) Based on this evaluation, marking and lighting are not necessary for aviation safety. However, if marking/ lighting are accomplished on a voluntary basis, we recommend it be installed and maintained in accordance with FAA Advisory circular 70/7460-1 K Change 2. This determination expires on 05/26/2014 unless: (a) the construction is started (not necessarily completed) and FAA Form 7460-2, Notice of Actual Construction or Alteration, is received by this office. (b) extended, revised, or terminated by the issuing office. (c) the construction is subject to the licensing authority of the Federal Communications Commission (FCC) and an application for a construction permit has been filed, as required by the FCC, within 6 months of the date of this determination. In such case, the determination expires on the date prescribed by the FCC for completion of construction, or the date the FCC denies the application. Page 1 of 3 - NOTE: REQUEST FOR EXTENSION OF THE EFFECTIVE PERIOD OF THIS DETERMINATION MUST BE E -FILED AT LEAST 15 DAYS PRIOR TO THE EXPIRATION DATE. AFTER RE-EVALUATION OF CURRENT OPERATIONS IN THE AREA OF THE STRUCTURE TO DETERMINE THAT NO SIGNIFICANT AERONAUTICAL CHANGES HAVE OCCURRED, YOUR DETERMINATION MAY BE ELIGIBLE FOR ONE EXTENSION OF THE EFFECTIVE PERIOD. This determination is based, in part, on the foregoing description which includes specific coordinates , heights, frequency(ies) and power . Any changes in coordinates , heights, and frequencies or use of greater power will void this determination. Any future construction or alteration , including increase to heights, power, or the addition of other transmitters, requires separate notice to the FAA. This determination does include temporary construction equipment such as cranes, derricks, etc., which may be used during actual construction of the structure. However, this equipment shall not exceed the overall heights as indicated above. Equipment which has a height greater than the studied structure requires separate notice to the FAA. This determination concerns the effect of this structure on the safe and efficient use of navigable airspace by aircraft and does not relieve the sponsor of compliance responsibilities relating to any law, ordinance, or regulation of any Federal, State, or local government body. Any failure or malfunction that lasts more than thirty (30) minutes and affects a top light or flashing obstruction light, regardless of its position, should be reported immediately to (877) 487-6867 so a Notice to Airmen (NOTAM) can be issued. As soon as the normal operation is restored, notify the same number. If we can be of further assistance, please contact our office at (816) 329-2508. On any future correspondence concerning this matter, please refer to Aeronautical Study Number 2012-ANM-2454-OE. 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' A - - - • •• • Page 3 of 3 • • - . s' • 1, • Mail Processing Center Federal Aviation Administration Southwest Regional Office Obstruction Evaluation Group 2601 Meacham Boulevard Fort Worth, TX 76137 Issued Date: 11/26/2012 Charles Ellsworth Bedrock Resources, LLC. 1014 County Road 311 New Castle, CO 81647 Aeronautical Study No. 2012-ANM-2455-OE ** DETERMINATION OF NO HAZARD TO AIR NAVIGATION ** The Federal Aviation Administration has conducted an aeronautical study under the provisions of 49 U.S.C., Section 44718 and if applicable Title 14 of the Code of Federal Regulations, part 77, concerning: Structure: Building NW Corner of Storage Building Location: Rifle, CO Latitude: 39-31-32.64N NAD 83 Longitude: 107-42-13.86W Heights: 5570 feet site elevation (SE) 25 feet above ground level (AGL) 5595 feet above mean sea level (AMSL) This aeronautical study revealed that the structure does not exceed obstruction standards and would not be a hazard to air navigation provided the following condition(s), if any, is(are) met: It is required that FAA Form 7460-2, Notice of Actual Construction or Alteration, be e -filed any time the project is abandoned or: At least 10 days prior to start of construction (7460-2, Part I) _X_ Within 5 days after the construction reaches its greatest height (7460-2, Part II) Based on this evaluation, marking and lighting are not necessary for aviation safety. However, if marking/ lighting are accomplished on a voluntary basis, we recommend it be installed and maintained in accordance with FAA Advisory circular 70/7460-1 K Change 2. This determination expires on 05/26/2014 unless: (a) the construction is started (not necessarily completed) and FAA Forni 7460-2, Notice of Actual Construction or Alteration, is received by this office. (b) extended, revised, or terminated by the issuing office. (c) the construction is subject to the licensing authority of the Federal Communications Commission (FCC) and an application for a construction permit has been filed, as required by the FCC, within 6 months of the date of this determination. In such case, the determination expires on the date prescribed by the FCC for completion of construction, or the date the FCC denies the application. Page 1 of 3 NOTE: REQUEST FOR EXTENSION OF THE EFFECTIVE PERIOD OF THIS DETERMINATION MUST BE E -FILED AT LEAST 15 DAYS PRIOR TO THE EXPIRATION DATE. AFTER RE-EVALUATION OF CURRENT OPERATIONS IN THE AREA OF THE STRUCTURE TO DETERMINE THAT NO SIGNIFICANT AERONAUTICAL CHANGES HAVE OCCURRED, YOUR DETERMINATION MAY BE ELIGIBLE FOR ONE EXTENSION OF THE EFFECTIVE PERIOD. This determination is based, in part, on the foregoing description which includes specific coordinates , heights, frequency(ies) and power . Any changes in coordinates , heights, and frequencies or use of greater power will void this determination. Any future construction or alteration , including increase to heights, power, or the addition of other transmitters, requires separate notice to the FAA. This determination does include temporary construction equipment such as cranes, derricks, etc., which may be used during actual construction of the structure. However, this equipment shall not exceed the overall heights as indicated above. Equipment which has a height greater than the studied structure requires separate notice to the FAA. This determination concerns the effect of this structure on the safe and efficient use of navigable airspace by aircraft and does not relieve the sponsor of compliance responsibilities relating to any law, ordinance, or regulation of any Federal, State, or local government body. Any failure or malfunction that lasts more than thirty (30) minutes and affects a top light or flashing obstruction light, regardless of its position, should be reported immediately to (877) 487-6867 so a Notice to Airmen (NOTAM) can be issued. As soon as the normal operation is restored, notify the same number. If we can be of further assistance, please contact our office at (816) 329-2508. On any future correspondence concerning this matter, please refer to Aeronautical Study Number 2012-ANM-2455-OE. Signature Control No: 173224825-177576744 Vee Stewart Specialist Attachment(s) Map(s) Page 2 of 3 (DNE) TOPO Map for ASN 2012-ANM-2455-OE 14e r.102 .4y Ae! 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Page3 of 3 I - ( 3k Mail Processing Center Federal Aviation Administration Southwest Regional Office Obstruction Evaluation Group 2601 Meacham Boulevard Fort Worth, TX 76137 Issued Date: 11/26/2012 Charles Ellsworth Bedrock Resources, LLC. 1014 County Road 311 New Castle, CO 81647 Aeronautical Study No. 2012-ANM-2456-OE ** DETERMINATION OF NO HAZARD TO AIR NAVIGATION ** The Federal Aviation Administration has conducted an aeronautical study under the provisions of 49 U.S.C., Section 44718 and if applicable Title 14 of the Code of Federal Regulations, part 77, concerning: Structure: Building Office Building Location: Rifle, CO Latitude: 39-31-32.63N NAD 83 Longitude: 107-42-21.65W Heights: 5450 feet site elevation (SE) 15 feet above ground level (AGL) 5465 feet above mean sea level (AMSL) This aeronautical study revealed that the structure does not exceed obstruction standards and would not be a hazard to air navigation provided the following condition(s), if any, is(are) met: It is required that FAA Form 7460-2, Notice of Actual Construction or Alteration, be e -filed any time the project is abandoned or: At least 10 days prior to start of construction (7460-2, Part I) X Within 5 days after the construction reaches its greatest height (7460-2, Part II) Based on this evaluation, marking and lighting are not necessary for aviation safety. However, if marking/ lighting are accomplished on a voluntary basis, we recommend it be installed and maintained in accordance with FAA Advisory circular 70/7460-1 K Change 2. This determination expires on 05/26/2014 unless: (a) the construction is started (not necessarily completed) and FAA Forni 7460-2, Notice of Actual Construction or Alteration, is received by this office. (b) extended, revised, or terminated by the issuing office. (c) the construction is subject to the licensing authority of the Federal Communications Commission (FCC) and an application for a construction permit has been filed, as required by the FCC, within 6 months of the date of this determination. In such case, the determination expires on the date prescribed by the FCC for completion of construction, or the date the FCC denies the application. Page 1 of 3 NOTE: REQUEST FOR EXTENSION OF THE EFFECTIVE PERIOD OF THIS DETERMINATION MUST BE E -FILED AT LEAST 15 DAYS PRIOR TO THE EXPIRATION DATE. AFTER RE-EVALUATION OF CURRENT OPERATIONS IN THE AREA OF THE STRUCTURE TO DETERMINE THAT NO SIGNIFICANT AERONAUTICAL CHANGES HAVE OCCURRED, YOUR DETERMINATION MAY BE ELIGIBLE FOR ONE EXTENSION OF THE EFFECTIVE PERIOD. This determination is based, in part, on the foregoing description which includes specific coordinates , heights, frequency(ies) and power . Any changes in coordinates , heights, and frequencies or use of greater power will void this determination. Any future construction or alteration , including increase to heights, power, or the addition of other transmitters, requires separate notice to the FAA. This determination does include temporary construction equipment such as cranes, derricks, etc., which may be used during actual construction of the structure. However, this equipment shall not exceed the overall heights as indicated above. Equipment which has a height greater than the studied structure requires separate notice to the FAA. This determination concerns the effect of this structure on the safe and efficient use of navigable airspace by aircraft and does not relieve the sponsor of compliance responsibilities relating to any law, ordinance, or regulation of any Federal, State, or local government body. Any failure or malfunction that lasts more than thirty (30) minutes and affects a top light or flashing obstruction light, regardless of its position, should be reported immediately to (877) 487-6867 so a Notice to Airmen (NOTAM) can be issued. As soon as the normal operation is restored, notify the same number. If we can be of further assistance, please contact our office at (816) 329-2508. On any future correspondence concerning this matter, please refer to Aeronautical Study Number 2012-ANM-2456-OE. 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'1 • ' '', ' .. . ,- - •-. . -- _ -. -4!?:, s - •- , , • • _ •,7 p \C. 5:1 ; • ^ • . • ••• .. * - - : • , - .----' . -'. :', O... :, .1.:::;„ ...7,/ ..7.7..::-A - . .I- i • . ) ',..,....:- • ': . 2 -;,'. ' ...... -.,.. / • . . •,. 1.,..i V . ,7....K . S . . . ' .... ---- ..t.. ''4...'. \ .. Y -f)- - .1. ••• , : ,.. - /4' ?-+--''i..- :,- ,...z.-.. - • ---,..,,,.\ . • • !, i kaa, • : ,.Z7,--1.-, --. , . .--. ...'"--i4• '...„ -' ii • i. f: -',.;. ..... ,, - F.." r --..,,...... vi 1 _- / ''>8,T-7•-• ...'0--"..../ *-. • ,•• ---/--- • • • "1------ • ";-• -•*--- / \........ ••• -, ,ia. : , :‘,47; -...• - i••• '''•••••••• • ....:, "?.•-•*. ts2,* , • ..1 -6* -"is• Page 3 of 3 • To Mail Processing Center Federal Aviation Administration Southwest Regional Office Obstruction Evaluation Group 2601 Meacham Boulevard Fort Worth, TX 76137 Issued Date: 11/26/2012 Charles Ellsworth Bedrock Resources, LLC. 1014 County Road 311 New Castle, CO 81647 Aeronautical Study No. 2012-ANM-2457-OE ** DETERMINATION OF NO HAZARD TO AIR NAVIGATION ** The Federal Aviation Administration has conducted an aeronautical study under the provisions of 49 U.S.C., Section 44718 and if applicable Title 14 of the Code of Federal Regulations, part 77, concerning: Structure: Building Shop Location: Rifle, CO Latitude: 39-31-31.71N NAD 83 Longitude: 107-42-14.20W Heights: 5571 feet site elevation (SE) 23 feet above ground level (AGL) 5594 feet above mean sea level (AMSL) This aeronautical study revealed that the structure does not exceed obstruction standards and would not be a hazard to air navigation provided the following condition(s), if any, is(are) met: It is required that FAA Form 7460-2, Notice of Actual Construction or Alteration, be e -filed any time the project is abandoned or: At least 10 days prior to start of construction (7460-2, Part I) _X_ Within 5 days after the construction reaches its greatest height (7460-2, Part II) Based on this evaluation, marking and lighting are not necessary for aviation safety. However, if marking/ lighting are accomplished on a voluntary basis, we recommend it be installed and maintained in accordance with FAA Advisory circular 70/7460-1 K Change 2. This determination expires on 05/26/2014 unless: (a) the construction is started (not necessarily completed) and FAA Form 7460-2, Notice of Actual Construction or Alteration, is received by this office. (b) extended, revised, or terminated by the issuing office. (c) the construction is subject to the licensing authority of the Federal Communications Commission (FCC) and an application for a construction permit has been filed, as required by the FCC, within 6 months of the date of this determination. In such case, the determination expires on the date prescribed by the FCC for completion of construction, or the date the FCC denies the application. Page 1 of 3 NOTE: REQUEST FOR EXTENSION OF THE EFFECTIVE PERIOD OF THIS DETERMINATION MUST BE E -FILED AT LEAST 15 DAYS PRIOR TO THE EXPIRATION DATE. AFTER RE-EVALUATION OF CURRENT OPERATIONS IN THE AREA OF THE STRUCTURE TO DETERMINE THAT NO SIGNIFICANT AERONAUTICAL CHANGES HAVE OCCURRED, YOUR DETERMINATION MAY BE ELIGIBLE FOR ONE EXTENSION OF THE EFFECTIVE PERIOD. This determination is based, in part, on the foregoing description which includes specific coordinates , heights, frequency(ies) and power . Any changes in coordinates , heights, and frequencies or use of greater power will void this determination. Any future construction or alteration , including increase to heights, power, or the addition of other transmitters, requires separate notice to the FAA. This determination does include temporary construction equipment such as cranes, derricks, etc., which may be used during actual construction of the structure. However, this equipment shall not exceed the overall heights as indicated above. Equipment which has a height greater than the studied structure requires separate notice to the FAA. This determination concerns the effect of this structure on the safe and efficient use of navigable airspace by aircraft and does not relieve the sponsor of compliance responsibilities relating to any law, ordinance, or regulation of any Federal, State, or local government body. Any failure or malfunction that lasts more than thirty (30) minutes and affects a top light or flashing obstruction light, regardless of its position, should be reported immediately to (877) 487-6867 so a Notice to Airmen (NOTAM) can be issued. As soon as the normal operation is restored, notify the same number. If we can be of further assistance, please contact our office at (816) 329-2508. On any future correspondence concerning this matter, please refer to Aeronautical Study Number 2012-ANM-2457-OE. Signature Control No: 173224827-177582297 Vee Stewart Specialist Attachment(s) Map(s) Page 2 of 3 (DNE) • TOPO Map for ASN 2012-ANM-2457-OE / • . 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