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Home My WebLink AboutCorrespondenceDave Argo From: Dave Argo Sent: Thursday, November 16, 2017 4:25 PM To: 'mikbenz@gmail.com' Cc: 'steven.resnick@alperaudi.com'; 'geoff@stanglbuilders.com' Subject: Spring Creek Ranch ADU - Permit #BLRE-11-17-5002 Mike: I have reviewed plans for the new Spring Creek Ranch A.D.U. located at 811 County Road 313 in New Castle. In contrast to applications that we typically receive in our office with engineering, these plans do not include structural specifications or details clarifying certain design assumptions & detail considerations. Before we can finalize our plan review we need to receive confirmation from your Engineer that structural design meets the following items, a few of which are Garfield County's minimum building requirements: a. Reference Building Code: 2015 I.R.C. (not 2115 as shown on Sheet A0.0, which is obviously a typo) b. Snow Load = 40 PSF (as measured at roof) c. Wind Speed: 115 mph (Ultimate Design) d. Wind Exposure: B or C (see Section R301.2.1.4) e. Seismic Design Category: C (per Figure R301.22) f. Frost Depth = 36 inches g. Foundation Design: We don't see any specifications requiring compliance with the Soils Engineer's recommendation for minimum allowable bearing pressure = 1,500 PSF ... please clarify. h. Concrete Specifications: What is minimum compressive strength for foundations and slabs? i. Foundation Plan — • Bearing Walls are not called out on this plan. Please clarify and/or provide additional specifications. • Window Wells — As shown on architectural sheet A2.0 window wells for downstairs bedrooms are illustrated as concrete, but there isn't any indication of these walls on Foundation Plan. Please clarify this discrepancy, and if these window wells are intended as concrete, revised/amended foundation plan must be submitted to our office for our review and approval prior to any footing/foundation inspection(s) at the job site. j. Framing/Roof Plans — Is wall bracing included in design? Shear wall locations are not clearly shown. Please clarify. Please feel free to submit via email response any Addendum items or amended drawings clarifying the above items. Thanks for your assistance — Dave Argo Plans Examiner CGarfield County Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 Tel: 970-945-8212 Ext. 1610 Email: dargo@garfield-county.com Web: garfield-county.com CONFIDENTIALITY NOTICE: This email communication and any files transmitted along with it are intended only for the person or entity to which it is addressed. If you have received this email in error, please immediately notify the sender by email and delete it from your files. 1 Dave Argo From: Dave Argo Sent: Friday, November 17, 2017 10:42 AM To: 'mike benz' Cc: Geoff Stangl; 'steven.resnick@alperaudi.com' Subject: RE: Spring Creek Ranch ADU - Permit #BLRE-11-17-5002 Mike: Thanks for this follow-up, but I don't understand the page numbers referenced by your Engineer — can you please explain the nature of these references? Although most of what your Engineer has provided satisfies our requirements, there are a few items requiring further explanation and/or submission of updated drawings, including the following items: (h) concrete specs (i) bearing walls and window wells (j) shear walls See below for per my own comments related to these items as shown in GREEN TEXT — Thanks again, Dave Argo Plans Examiner Garfield County Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 Tel: 970-945-8212 Ext. 1610 Email: dargo@garfield-county.com Web: garfield-county.com CONFIDENTIALITY NOTICE: This email communication and any files transmitted along with it are intended only for the person or entity to which it is addressed. If you have received this email in error, please immediately notify the sender by email and delete it from your files. From: mike benz [mailto:mikbenz@gmail.com] Sent: Friday, November 17, 2017 9:35 AM To: Dave Argo <dargo@garfield-county.com> Cc: Geoff Stangl <geoff@stanglbuilders.com> Subject: Fwd: Spring Creek Ranch ADU - Permit #BLRE-11-17-5002 Dave, See structural engineers response below and let me know if u have any concerns with them. MichaelBenz - Architect 314.452.0347 Begin forwarded message: From: Steve Resnick <steven.resnick@alperaudi.com> Date: November 17, 2017 at 7:03:33 AM PST 1 To: "mikbenz@gmail.com" <mikbenz_@gmail.com> Cc: "geoff@stanglbuilders.com" <geoff@stanRIbuilders.com> Subject: RE: Spring Creek Ranch ADU - Permit #BLRE-11-17-5002 Mike/Geoff — We have met the requirements of Dave's items. These items would typically be on the general notes sheet, but obviously we did not provide one. See below for where you can find the answers to his questions, in RED. 11 ALPER AUDI, INC, STRUCTURAL ENGINEERS Steven Resnick, P.E., S.E., LEED AP Structural Engineer 1804 Borman Circle Drive 1 St. Louis, MO 63146 phone 314.432.8600 1 mobile 314.229.9898 1 fax 314.432.8630 website 1 email 1 vCard 1 map 1 disclaimer From: Dave Argo Finailto:dargo@garfieid-county.com] Sent: Thursday, November 16, 2017 5:25 PM To: mikbenz@gmail.com Cc: Steve Resnick <steven.resnick@alperaudi.com>; geoff@stanglbililders.com Subject: Spring Creek Ranch ADU - Permit #BLRE-11-17-5002 Mike: I have reviewed plans for the new Spring Creek Ranch A.D.U. located at 811 County Road 313 in New Castle. In contrast to applications that we typically receive in our office with engineering, these plans do not include structural specifications or details clarifying certain design assumptions & detail considerations. Before we can finalize our plan review we need to receive confirmation from your Engineer that structural design meets the following items, a few of which are Garfield County's minimum building requirements: a. Reference Building Code: 2015 I.R.C. (not 2115 as shown on Sheet A0.0, which is obviously a typo) Page 2 b. Snow Load = 40 PSF (as measured at roof) On all member reports, but Page 11 for example. c. Wind Speed: 115 mph (Ultimate Design) Page 3 d. Wind Exposure: B or C (see Section R301.2.1.4) Page 3 e. Seismic Design Category: C (per Figure R301.22) Attached f. Frost Depth = 36 inches Average Grade = 99'-3". Bottom of footing to be 96'-3" max to meet frost. Bottom of footings as shown on plan = 96'-0". g. Foundation Design: We don't see any specifications requiring compliance with the Soils Engineer's recommendation for minimum allowable bearing pressure = 1,500 PSF ... please clarify. Page 47 among others h. Concrete Specifications: What is minimum compressive strength for foundations and slabs? Assumed 3500psi, on Page 47 — Will there be a formal addendum issued to the Contractor so they know this is the performance specification for concrete? i. Foundation Plan — • Bearing Walls are not called out on this plan. Please clarify and/or provide additional specifications. Called out on plan — 8" wall w/#5 @ 12" ctr'd each way. Again, will the foundation plan be updated to clearly depict interior bearing walls as concrete and not frame construction? (this is not clearly shown or called out on the plans we now have — 2 and it may cause confusion for the Contractor and/or our Building Inspector if not updated accordingly). • Window Wells — As shown on architectural sheet A2.0 window wells for downstairs bedrooms are illustrated as concrete, but there isn't any indication of these walls on Foundation Plan. Please clarify this discrepancy, and if these window wells are intended as concrete, revised/amended foundation plan must be submitted to our office for our review and approval prior to any footing/foundation inspection(s) at the job site. There is no response to this item ... please coordinate and clarify this issue for us. j. Framing/Roof Plans — Is wall bracing included in design? Shear wall locations are not clearly shown. Please clarify. Out of plane wall bracing per NDS. What does this response mean? If necessary, please provide specification and/or locations on plans. Please feel free to submit via email response any Addendum items or amended drawings clarifying the above items. Thanks for your assistance — Dave Argo Plans Examiner 3 �� .� L. s; Company Address City, State Phone JOB TITLE Bob Chapman - Colorado Cabin JOB NO. CALCULATED BY CHECKED BY SHEET NO. DATE DATE Seismic Loads: Risk Category • Importance Factor (I) • Site Class Ss (0.2 sec) = S1 (1.O sec) = Fa = Fv = 1.541 2.400 Seismic Design Category = Number of Stories: Structure Type: Horizontal Struct Irregularities: Vertical Structural Irregularities: Flexible Diaphragms: Building System: Seismic resisting system: System Structural Height Limit: Actual Structural Height (hn) = IBC 2015 1.00 D 32.40 %g 8.20 %g Sms = Sm1 = 0.499 0.197 SDs = 0.333 Sol = 0.131 C 1 All other building systems No plan Irregularity No vertical Irregularity Yes Bearing Wall Systems Light frame (wood) walls with structural wood shear panels Height not limited 30.8 ft DESIGN COEFFICIENTS AND FACTORS Response Modification Coefficient (R) = Over -Strength Factor (Do) = Deflection Amplification Factor (Cd) = SDS = Sal = 6.5 2.5 4 0.333 0.131 Seismic Load Effect (E) = p QE +1- 0.2SDs D Special Seismic Load Effect (Em) = S2o QE +1- 0.2SDs D PERMITTED ANALYTICAL PROCEDURES Simplified Analysis - Use Equivalent Lateral Force Analysis Equivalent Lateral -Force Analysis - Permitted Building period coef. (CT) = 0.020 Approx fundamental period (Ta) = CThn" = User calculated fundamental period (T) = Long Period Transition Period (TL) = ASCE7 map = Seismic response coef. (Cs) = SDsI/R = need not exceed Cs = Sdl 1 IRT = but not less than Cs = 0.044Sds1= USE Cs = Model & Seismic Response Analysis ALLOWABLE STORY DRIFT Structure Type: All other structures Allowable story drift = 0.020hsx where hsx is the story height below level x Strength Level Forces Design Category = C Design Category = B p = redundancy coefficient = p QE +1- 0.067D QE = horizontal seismic force = 2.5 QE +/- 0.067D D = dead load 0.261 sec x= 0.75 0 sec 8 0.051 0.077 0.015 0.051 Design Base Shear V = 0.051W Cu = 1.64 Tmax = CuTa = 0.428 Use T = 0.261 - Permitted (see code for procedure)