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Home My WebLink AboutX2014-0814 - Misc1 116-04 September 9, 2014 Ginter & Associates, Inc. Engineering Geology Consultants 27631 Durazno Mission Viejo, CA 92692 ofc (949) 581-2363 cell (714) 478-1167 TSG Parcel 1, LLC September 9, 2014 2 Park Plaza #700 Project No. 116-04 Irvine, CA 92614 Attn: Mr. John Santry Subject: 3rd Response to City of Newport Beach Geotechnical Report Review Checklist For Uptown Newport Project Phase 1, 4311 Jamboree Road, Newport Beach, CA Plan Check # 0733-2014 References: See attached References INTRODUCTION: This report has been prepared to provide the responses to the comments listed in the Geotechnical Report Review Checklist by the City of Newport Beach’s Geotechnical Consultant, Ken Bagahi of Bagahi Engineering, Inc. (Appendix I). The following are the comments by the reviewer and our corresponding responses: Comment #1: Page 11, Site Groundwater Conditions. A) It is stated thet the intermediate groundwater (65-100 feet bgs) has been lowered by 25 feet from 1989 to 2010. Please evaluate time rate of primary and secondary consolidation settlement from lowering of groundwater. Please clarify if any settlement from lowering of the groundwater has impacted the site, and if so, if such settlement is ongoing. Response: At a recent meeting with the reviewer on August 27, 2014 at the City of Newport Beach, various aspects of the reviewer’s comments were presented. This firm indicated that there was no evidence of settlement in the building slab, curbs and gutters, or parking lot. It was also discussed and agreed upon that a review of well water data should be performed to determine that the site is part of a regional groundwater lowering regime and that the site is not located at the edge of the groundwater lowering basin where differential settlement could occur. The following narrative and well log data support our conclusion. 2 116-04 September 9, 2014 The Orange County Groundwater Basin extends from the Prado Damn area in NE Orange County S-SW to the coast along the Santa Ana River. Well development and groundwater use within the Orange County Groundwater Basin has been undertaken by all of the local water districts including the Orange County Water District (OCWD), Mesa Water District (MWD), and Irvine Ranch Water District (IRWD). This increased use of the aquifer of the Orange County Groundwater Basin began in 1972, with wells by the OCWD. The other local districts followed suit with their own water production wells: MWD (1977), and IRWD (1979). These production wells were drilled to reduce local districts dependence on imported water from the Colorado River and Northern California sources. They have been steadily drawing water from the aquifers in the Orange County Groundwater Basin. This change in water supply resulted in a drop in groundwater levels from that time forward. Natural recharge of this groundwater would normally occur along the Santa Ana River Basin, however, the completion of the Prado Dam in 1941, while making the Santa Ana River flood plain safer, essentially cut off the vast majority of natural recharge. The groundwater level data accompanying this letter is from the California Department of Conservation, and confirms the steady draw down within the Orange County Groundwater Basin, and in particular, the area near the subject site (Newport- Mesa area). Additionally, the data shows that the draw down measured at the subject site appears to be in concert with several local wells and is neither anomalous, nor localized, and is not at the edge of the basin where differential settlement may be an issue. 3 116-04 September 9, 2014 ORANGE COUNTY WATER DISTRICT SERVICE AREA 4 116-04 September 9, 2014 MESA WATER DISTRICT SERVICE AREA 5 116-04 September 9, 2014 IRVINE RANCH WATER DISTRICT SERVICE AREA 6 116-04 September 9, 2014 7 116-04 September 9, 2014 Newport Beach Golf Course (Approx. 1 mile west of subject site) 8 116-04 September 9, 2014 9 116-04 September 9, 2014 Rancho San Joaquin Golf Course (1.6 miles east of subject site) 10 116-04 September 9, 2014 11 116-04 September 9, 2014 Santa Ana Country Club Well#1 (approx. 1.82 miles west of subject site) 12 116-04 September 9, 2014 13 116-04 September 9, 2014 Santa Ana Country Club Well #2 (approx. 1.82 miles W of subject site) 14 116-04 September 9, 2014 15 116-04 September 9, 2014 San Mateo @ Main (Approx. 2.25 mile N-NE of subject site) 16 116-04 September 9, 2014 17 116-04 September 9, 2014 18 116-04 September 9, 2014 19 116-04 September 9, 2014 20 116-04 September 9, 2014 21 116-04 September 9, 2014 22 116-04 September 9, 2014 23 116-04 September 9, 2014 24 116-04 September 9, 2014 25 116-04 September 9, 2014 Jamboree NE of McGaw (Approx. 3 Miles N- NE of subject site) 26 116-04 September 9, 2014 27 116-04 September 9, 2014 28 116-04 September 9, 2014 29 116-04 September 9, 2014 30 116-04 September 9, 2014 31 116-04 September 9, 2014 32 116-04 September 9, 2014 33 116-04 September 9, 2014 34 116-04 September 9, 2014 35 116-04 September 9, 2014 36 116-04 September 9, 2014 Carl Thornton Park (Approx. 3.8 miles N-NW of subject site) 37 116-04 September 9, 2014 38 116-04 September 9, 2014 39 116-04 September 9, 2014 40 116-04 September 9, 2014 41 116-04 September 9, 2014 42 116-04 September 9, 2014 43 116-04 September 9, 2014 44 116-04 September 9, 2014 45 116-04 September 9, 2014 46 116-04 September 9, 2014 47 116-04 September 9, 2014 48 116-04 September 9, 2014 49 116-04 September 9, 2014 50 116-04 September 9, 2014 51 116-04 September 9, 2014 Costa Mesa Golf Course (Approx. 4.15 miles west of subject site) 52 116-04 September 9, 2014 53 116-04 September 9, 2014 54 116-04 September 9, 2014 55 116-04 September 9, 2014 56 116-04 September 9, 2014 Mesa Verde Country Club (4.5 Miles N-NW of subject site.) 57 116-04 September 9, 2014 58 116-04 September 9, 2014 59 116-04 September 9, 2014 60 116-04 September 9, 2014 East of Spirit Circle (Approx. 5.25 miles west of subject site) 61 116-04 September 9, 2014 62 116-04 September 9, 2014 63 116-04 September 9, 2014 64 116-04 September 9, 2014 65 116-04 September 9, 2014 Comment #12: Appendix V. Liquefaction Analysis. Provide input data. a) Minimum FS=1 is used in the analysis. Please revise to FS = 1.3 b) Provide basis for % fines used in analysis, and c) Provide seismic induced settlement from combined saturated and unsaturated soils Response: (a) Liquefaction analyses are revised to FS=1.3 and the results are provided in Appendix I. (b) Fines content were internally generated by the LiquefyPro program based on the methods and correlations between Soil Behavior Type index (Ic) and Apparent Fines Content suggested by Robertson and Wride (1998). (c) All soil layers including saturated and unsaturated soils were considered in the seismically induced settlement calculations. Public Works Dept. Comment #10: Provide documentation indicating that the proposed grading adjacent to Jamboree Road will not negatively impact the roadway. The geotechnical report should clearly state the proposed grading will not negatively impact the roadway along Jamboree Road. Response: Based on our stability analyses presented in our 4/2/14 report, and additional responses to comments dated 5/23/14, the proposed grading adjacent to Jamboree Road will not negatively impact the roadway, provided our recommendations are closely adhered to. It should be noted that this firm will review the shoring design and provide recommendations as necessary when they are available for review. {Signatures on following page} 66 116-04 September 9, 2014 67 116-04 September 9, 2014 REFERENCES Bender, E.E., 2000; Late Quaternary Uplift and Earthquake Potential of the San Joaquin Hills, Southern Los Angeles Basin, California: Comment and Reply in Geology, GSA vol. 28, no. 4, pg. 383 California Department of Water Resources, online Water Data Library http://www.water.ca.gov/waterdatalibrary/ Cao, Tiarqing, Bryant, William A., Rowshandel, Badie, Branum, David, Wills, Christopher J.; 2003, The Revised 2002 California Probabilistic Seismic Hazard Maps, USGS, CGS Dames & Moore, 6/11/97; Report, Geotechnical, Pilot Test Construction Program, Building 503 Base Isolation Project _____________, 3/7/96; Report, Pre-Pilot Load Testing, Building 503 Base Isolation Project _____________, 12/14/96; Report, Geotechnical Investigation, Phase 1, Building 503 Base Isolation Project _____________, 9/3/96; Supplementing Geotechnical Investigation, Pavement Recommendations, Proposed Locking Dock Area, East of New Building 503 Addition _____________, 4/8/96; Report, Geotechnical Investigation, Proposed 3-story Addition, Building 503 _____________, 12/29/95; Constructability Study, Validation of Isolation Retrofit, Building 503 _____________, 12/22/95; Final Report Preliminary Soil Contamination Investigation, Validation of Base Isolation Retrofit Concept Building 503 _____________, 4/28/95; Report, Geotechnical and Seismological Services, Proposed Seismic Retrofit, Building 503 and 505 Ginter & Associates, Inc., 4/2/14; Rough Grading Phase 1 Plan Review, Parcel Map # 2013-108, TTM# 17438, Uptown Newport, Newport Beach, CA _____________, 2/20/13; Infiltration Rate Evaluation for Uptown Newport Center, Jamboree Road, Newport Beach, California _____________, 11/2011; Preliminary Geologic and Geotechnical Engineering Investigation, Uptown Newport, 4321 Jamboree Road, Newport Beach, CA _____________, 4/26/10; Engineering Geologic Due Diligence Review, Uptown Newport Village, 4321 Jamboree Road, Newport Beach, CA Grant, Lisa B., Mueller, K.I., Gath, E.M., Cheng, H., Edwards, R.I., Munro, B., and Kennedy, G.I., 1999; Late Quaternary Uplift and Earthquake Potential of the San Joaquin Hills, Southern Los Angeles Basin California Geology (GSA) v. 27, pgs. 1031-1034 Grant, Lisa B., Ballenger, Leslie J., Runnerstrom, Eric E., 2002; Coastal Uplift of the San Joaquin Hills, Southern Los Angeles Basin, California, by a Large Earthquake since A.D. 1635 Maurseth, Howe, Lockwood & Associates, 4/14/67; Report, Foundation Investigation, Building 503 Miller, R.V., Tan, S.S., 1976; Geology and Engineering Geologic Report of the South Half Tustin Quadrangle Orange County, California; California Division of Mines and Geology Special Report 126 Morton, R.K., Edgington, W.I., Fife, D.I., 1974; Geology and Engineering Geologic reports of the San Juan Capistrano Quadrangle Orange County California, California Division of Mines and Geology Special Report 112 68 116-04 September 9, 2014 Mueller, Karl, Ponti, Dan; Determing Holocene Uplift Rates on the San Joaquin Hills Blind Thrust, Final Technical Report Award # 05HQGR0090 Robertson, P.K. , and Wride, C.E. (1998), Evaluating Cyclic Liquefaction Potential Using the Cone Penetration Test, Published in Canadian Geotechnical Journal, 1998, 35(3): 442-459 Vedder, I.C., Yerkes, R.E., Schoelhamer, I.F., 1957; Geologic Map of the San Joaquin Hills, San Juan Capistrano Area, Orange Orange County California USGS Oil and Gas Investigations Map OM-193 Wright, T.L., 1991; Structural Geology and Tectonic Evaluation of the Los Angeles Basin, California; in Biddle, K.T. Ed. Active Margin Basins, AAPG Memoir 52, pgs. 35-134 69 116-04 September 9, 2014 APPENDIX I LIQUEFACTION ANALYSES 70 116-04 September 9, 2014 71 116-04 September 9, 2014 72 116-04 September 9, 2014 73 116-04 September 9, 2014 APPENDIX II CITY REVIEW SHEETS 74 116-04 September 9, 2014 75 116-04 September 9, 2014 76 116-04 September 9, 2014 77 116-04 September 9, 2014 78 116-04 September 9, 2014 79 116-04 September 9, 2014