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HomeMy WebLinkAbout20210511_ApplicationPA2021-112 Community Development Department 1 00 Civic Center Drive CITY OF NEWPORT BEACH Planning 1. Check Permits Requested: Perm it~ppl icau· on Newport Beach, California 92660 949 644-3200 ~'li) ,; \ \ &•wportbeachoa.go,/rommuoityde,elopm eol Cl Approval-in-Concept -AIC # ~ Coastal Development Permit D Lot Merger D Limited Term Permit - 0 Waiver for De Minimis Development O Seasonal D < 90 day 0 >90 days D Coastal Residential Development D Modification Permit D Condominium Conversion D Off-Site Parking Agreement D Comprehensive Sign Program D Planned Community Development Plan D Development Agreement D Planned Development Permit D Development Plan D Site Development Review -D Major D Minor D Lot Line Adjustment D Parcel Map 2. Project Address(es)/Assessor's Parcel 6 Oceci,u.__...-----~ 4. D Staff Approval D Tract Map D Traffic Study D Use Permit -□Minor □Conditional D Amendment to existing Use Permit D Variance 0 Amendment -□Code □PC □GP □LCP D Other: I DateJ f ~/ (--2 [ I MM/DD/YEAR Signature(s): _______________ Title:~---------~ Date: ~----~I *May be signed by the lessee or by an authorized agent if written authorization from the owner of record is filed concurrently with the application. Please note, the owner(s)' signature for Parcel/Tract Map and Lot Line Adjustment Application must be notarized . PA2021-112 consultants Site: Proposed Residential Development: 114 E. Oceanfront Newport Beach, California Executive Summary April 19, 2021 Project No. MA304.1 engineering geotechnical applications Based on our geotechnical study of the site, our review of available reports and literature and our experience, it is our opinion that the proposed residential development is feasible from a geotechnical standpoint. There appear to be no significant geotechnical constraints on-site that cannot be mitigated by proper planning, design, and utilization of sound construction practices. The engineering properties of the soil and native materials, and surface drainage offer favorable conditions for site re-development. The following key elements are conclusions confirmed from this investigation: A review of available geologic records indicates that no active faults cross the subject property. The site is located in the seismically active Southern California area, and within 2 kilometers of the Type B Newport-Inglewood Fault. As such, the proposed development shall be designed in accordance with seismic considerations specified in the 2019 California Building Code (CBC) and the City of Newport Beach requirements. Foundation specifications herein include added provisions for potential liquefaction on-site per City policy CBC 1803.11 -12. SUMMARY OF RECOMMENDATIONS Design Item Mat Slab Foundation: Mat Slab Bearing Pressure: Modulus of Subgrade Reaction: Passive Lateral Resistence: Coefficient of Friction: Building Pad Over-Excavation: Soil Expansion: Soil Sulfate Content: Building Pad Over-Excavation: Recommendations min. 12 inches with thickened edges (+ 6 inches) with no. 5 bars @ 12" o.c. each way, top and bottom 1,000 psf ks = 90 lbs/in3 250 psf per foot 0.30 min. 2½ ft. below existing grade, + scarify bottom 6 in. Non-Expansive Silty Sands Negligible min. 2½ ft. below ex. grade, +6" scarify & treat bottom * Concrete building slabs shall be underlain by 2" clean sand, underlain by a min. 15 mil thick vapor barrier, with all laps sealed, underlain by 4" of ¾-inch gravel (capillary break). Seismic Values (per CBC 2019, ASCE 7-16 Equivalent Lateral Force Method): Site Class Definition (Table 1613.5.2) D Mapped Spectral Response Acceleration at 0.2s Period, s. 1.394 g Mapped Spectral Response Acceleration at 1 s Period, S1 0.495 g Short Period Site Coefficient at 0.2 Period , Fa 1.2 Long Period Site Coefficient at 1 s Period, F v 1. 8 Adjusted Spectral Response Acceleration at 0.2s Period, SMs 1.673 g Adjusted Spectral Response Acceleration at 1s Period, SM1 0.891 g Design Spectral Response Acceleration at 0.2s Period, S08 1.115 g Design Spectral Response Acceleration at 1 s Period, S01 0.594 g PGAm = 0.734 g Note: EGA Consultants recommends the structural engineer review and confirm associated seismic values for the proposed residential development. 375-C Monte Vista Aven ue • Costa Mesa, CA 92627 • (949) 642-9309 • FAX (949) 6 4 2 -1 290 PA2021-112 L\TC Hazards by Location Search Information Address: Coordinates: Elevation: Timestamp: 114 E Oceanfront, Newport Beach, CA 92661, USA 33.6033041, -117.905563 15 ft 2021-04-16104:39:32.8452 Seismic Long Beac 0 Catalina Island Essential Fish Habitat... 15ft heim 'Jne .-:>i:lll Ot:lflcllUIIIU 0 Riverside Temecula 0 -Cll Hazard Type: Reference Document: ASCE7-16 Go gle W N . Oceanside atlo Map data ©2021 Google, INEGI Risk Category: Site Class: II D-default Basic Parameters Name Value Ss 1.394 S1 0.495 SMs 1.673 SM1 * null Sos 1.115 So1 * null * See Section 11.4.8 Description MCER ground motion (period=0.2s) MCER ground motion (period=1.0s) Site-modified spectral acceleration value Site-modified spectral acceleration value Numeric seismic design value at 0.2s SA Numeric seismic design value at 1.0s SA •Additional Information Name Value Description soc * null Seismic design category Fa 1.2 Site amplification factor at 0.2s Fv * null Site amplification factor at 1.0s CRs 0.905 Coefficient of risk (0.2s) CR1 0.919 Coefficient of risk (1.0s) PGA 0.611 MCEG peak ground acceleration FPGA 1.2 Site amplification factor at PGA PGAM 0.734 Site modified peak ground acceleration --------- PA2021-112 TL 8 SsRT 1.394 SsUH 1.541 SsD 2.622 S1RT 0.495 S1UH 0.539 S1D 0.822 PGAd 1.057 • See Section 11.4.8 Long-period transition period (s) Probabilistic risk-targeted ground motion (0.2s) Factored uniform-hazard spectral acceleration (2% probability of exceedance in 50 years) Factored deterministic acceleration value (0.2s) Probabilistic risk-targeted ground motion (1.0s) Factored uniform-hazard spectral acceleration (2% probability of exceedance in 50 years) Factored deterministic acceleration value (1.0s) Factored deterministic acceleration value (PGA) The results indicated here DO NOT reflect any state or local amendments to the values or any delineation lines made during the building code adoption process. 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