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Home My WebLink AboutX2017-0944 - Soils (2)G3SOI[Works GEOLOGY• GEOTECH•GROUNDWATER Walker Custom Homes, Inc. 620 Poinsettia Avenue Corona Del Mar, CA 92660 Attention: Mr. Mike Walker Subject: Report of Geotechnical Observation and Testing 620 Poinsettia Avenue Corona Del Mar, CA 92660 References: See attached List of Selected References Dear Mr. Walker, 06 31- 2v1T ko PaN 5e f -ht Ave January 31, 2018 Project No. 1-1097 This report presents a summary of our geotechnical field observations and results of testing performed during recent site grading for the property located at 620 Poinsettia Avenue in Corona Del Mar, CA. Limits of Report The geotechnical services performed during this phase of construction consisted of observations and testing during the remedial grading operations. Our services were provided on an as -requested basis between November 17 and: December 29, 2017. The approximate limits of grading addressed in this report are shown on the attached Figure 1. Observations and Testing The following observations were made and testing performed: • Prior to the date of our initial field observations, existing structures and foundation elements were demolished and hauled off-site; • Six (6) caisson excavations (12" diameters) were advanced to minimum 8 feet below site grades at the southwestern corner of the site for the planned property line retaining wall; • The building pad was over excavated at least 3 feet below site grades. This overexcavation was performed in stages and extended laterally to a minimum distance of about 2 feet beyond the outside footing edges; • Overexcavation bottoms were scarified, moisture conditioned, and recompacted prior to the placement of engineered compacted fills; and • Engineered compacted fills comprised of on-site soils moisture conditioned and compacted to achieve approximate rough grade elevations. 350 Fischer Ave. Front • Costa Mesa, CA 92626 « P: 714 668 5600 - www.G3SoilWorks.com Walker Custom Homes, Inc. January31, 2018 Report of Geotechnical Observation and Testing Project No. 1-1097 620 Poinsettia Avenue Page 2 of 4 Corona Del Mar, CA 92660 Soil type and laboratory maximum density / optimum moisture content test results are presented in Table I, and field density test results are summarized in Table II. The approximate locations of field density tests are shown on the attached Field Density Test Location Map (Figure 1), utilizing an excerpted portion of the referenced Precise Grading Plan as a base. Fill Placement and Compaction Fills consisting of on-site and materials were placed in lifts, moisture -conditioned to wet of optimum moisture contents and compacted to at least 90 percent relative compaction, based on the laboratory maximum dry density (ASTM: D1557). Test Procedures Laboratory maximum dry density / optimum moisture content testing was performed in accordance with ASTM: D1557 test procedures. The results of this testing are summarized in Table I. In-situ density tests were performed utilizing the nuclear density (ASTM: D6938) test method. Test results are presented in Table II. Conclusions and Comments Based upon our observations and the results of testing, it is our opinion that the remedial grading operations observed by our firm and described herein were performed in substantial accordance with the recommendations presented in the referenced report, project plans, and grading requirements of the City of Newport Beach. Completed work under the purview of this report is considered suitable and acceptable for the intended use as of the date of this report. The pad subgrade soils should be observed and retested, as necessary by a representative of our office at the time of on-site construction to verify acceptability the exposed subgrade soils. Limitations This report presents information and data relative to our geotechnical observations and testing performed during the site grading for the planned construction at 620 Poinsettia Avenue, in Corona Del Mar, California. A representative of this firm conducted periodic tests and made observations during the grading operations performed as of the date of our testing. During this time, our field personnel did not direct or supervise the contractor or his work forces. Professional and technical advice and suggestions were provided to the owner and/or his designated representative based on the results of the testing and observations. The results of field density tests reported herein are valid at the locations and depths tested and at the time of testing only. Changes in the condition and properties of compacted fill can occur with the passage of time, whether they be due to natural processes or human activities (such as soil expansion, shrinkage, rainfall, landscape irrigation, rodent activity, and other factors) at or adjacent to the property. Accordingly, the findings of this report may be invalidated wholly or partially by changes outside our control. 350 Fischer Ave. Front o Costa Mesa, CA 92626 + P: 714 668 5600 m www.G3Soi]Works.com Walker Custom Homes, Inc. January 31, 2018 Report of Geotechnical Observation and Testing Project No. 1-1097 620 Poinsettia Avenue Page 3 of 4 Corona Del Mar, CA 92660 Our observations and testing services as well as the findings and conclusions presented in this report are in accordance with the generally accepted principles and local practice in the field of geotechnical engineering. No other warranty, express or implied, is made as to the conclusions and professional opinions provided herein. This report is subject to review by the controlling authorities for the subject project. If you have any questions or require additional information, please do not hesitate to call. Sincerely, G3SOILWORKS, INC. 085642 0 Attachments: List of Selected References Table I — Summary of Laboratory Test Results Table II — Summary of Field Density Test Results Figure 1 — Field Density Test Location Map 350 Fischer Ave. Front + Costa Mesa, CA 92626 < P: 714 668 5600 > www.G3Sol[Works.com Walker Custom Homes, Inc. January 31, 2018 Report of Geotechnical Observation and Testing Project No. 1-1097 620 Poinsettia Avenue Corona Del Mar, CA 92660 LIST OF SELECTED REFERENCES 1. G3SoilWorks, Inc., Preliminary Geotechnical Investigation Report, 620 Poinsettia Avenue, Corona Del Mar, California, dated February 27, 2017. 2. G3SoilWorks, Inc., Geotechnical Review of Civil Plans, 620 Poinsettia Avenue, Corona Del Mar, California, dated August 24, 2017. 3. JT Consulting Engineers, 620 Poinsettia Avenue, Newport Beach, CA 92660, Sheets C.1 through C.5, dated March 10, 2017. 350 Fischer Ave. Front < Costa Mesa, CA 92626 < P: 714 668 5600 > www.G3SoilWorks.com Walker Custom Homes, Inc. January 31, 2018 Report of Geotechnical Observation and Testing Project No. 1-1097 620 Poinsettia Avenue Sheet 1 of 1 Corona Del Mar, California Table I Maximum Dry Density I Optimum Moisture Content Test Results Laboratory Standard Elevations estimated from project plans Soil Type Description Optimum Moisture N Maximum Dry Density (pcf) Test Method A Reddish brawn silty fine-med SAND 10.0 125.0 ASTM: D1557 B Red brown silty fine -mad SAND whrace gravel 10.0 125.0 ASTM: D1557 Table II Summary of Field Density Test Results RELATIVE RELATIVE COMP. PASS TEST TEST DEPTH / MOIST UNIT DRY COMP. STD SOIL or DATE NO. LOCATION ELEV.(FT.) (%) WEIGHT N N TYPE FAIL 12/21/2017 1 Building Pad 133 12.4 112.7 90 90 A PASS 12/21/2017 2 Building Pad 133 12.7 115.1 92 90 A PASS 12/22/2017 3 Building Pad 134 10.2 112.6 90 90 A PASS 12/22/2017 4 Building Pad 135 11.0 114.5 92 90 A PASS 12/22/2017 5 Building Pad 135 12.1 114.1 91 90 A PASS 12/22/2017 6 Building Pad 131 11.6 113.0 90 90 A PASS 12/2912017 7 Building Pad 131 12.6 113.4 91 90 B PASS 12/29/2017 8 Building Pad 132 11.2 114.3 91 90 B PASS 12/29/2017 9 Building Pad 133.5 11.3 112.7 90 90 B PASS 12/29/2017 10 Building Pad 133.5 12.7 113.8 91 90 B PASS Elevations estimated from project plans CL 4TH AVENUE v "N', ., _. LL _l b ' ®®; Retaining Wall Location r� BASE MAP EXCERPTED FROM"JT CONSULTING `i Approximate Limits of Remedial Grading ENGINEERS PRECISE GRADING PLAN, SHEET C2" Approximate Field DensityTest Location J GEOLOGY• GEOTECH -GROUNDWATER Walker Custom Homes, Inc. 620 Poinsettia Corona Del Mar, California Attention: Mr. Mike Walker Subject: Final Report of Geotechnical Observation and Testing On -Site Construction Phase 620 Poinsettia Avenue Corona Del Mar, California References: See attached List of Selected References Dear Mr. Walker, July 12, 2019 Project No. 1-1097-A This report presents a summary of our geotechnical field observations and testing performed duringthe on-site construction phase forthe new residence at 507 Harbor Island Drive, in the City of Newport Beach, California. Observations and Testing Our services were provided on an as -requested basis between January 15 and March 8, 2018 and consisted of footing and floor slab subgrade observations as noted below: • Foundation excavations were observed and noted to be embedded into and on the engineered fill placed as part of the rough grading; • The floor slab subgrade was observed to consist of the engineered compacted fill placed as part of the rough grading and in a firm and unyielding condition; Conclusions and Comments Based on our field observations, it is our opinion that onsite construction observed by our firm and described herein were performed in substantial accordance with the recommendations presented in the referenced report and project plans. Completed work under the purview of this report is considered suitable and acceptable for the intended use. Limitations This report presents information and data relative to our geotechnical observations performed during the on-site construction phase for the planned residence at 620 Poinsettia Avenue, in Corona Del Mar, California. During this time, our field personnel did not direct or supervise the contractor or his work forces. Professional and technical advice and suggestions were provided to the owner and/or his designated representative, on an as needed basis, based on our observations. 350 Fischer Ave. Front o Costa Mesa, CA 92626 o p; 714 668 5600 o www.G3SoilWorks.com Walker Custom Homes, Inc. July 12, 2019 Final Report of Geotechnical Observation and Testing Project No. 1-1097 On -Site Construction Phase Page 2 of 3 620 Poinsettia Avenue Corona Del Mar, California Changes in the condition and properties of compacted fill can occur with the passage of time, whether they be due to natural processes or human activities (such as soil expansion, shrinkage, rainfall, landscape irrigation, rodent activity, and other factors) at or adjacent to the property. Accordingly, the findings of this report may be invalidated wholly or partially by changes outside our control. Our field observations as well as the findings and conclusions presented in this report are in accordance with the generally accepted principles and local practice in the field of geotechnical engineering. No other warranty, express or implied, is made as to the conclusions and professional opinions provided herein. This report is subject to review by the controlling jurisdiction for the subject project. If you have any questions or require additional information, please do not hesitate to call. Sincerely, G3SoilWorks, Inc. A Attachments: List of Selected References 350 Fischer Ave. Front , Costa Mesa, CA 92626 - P: 714 668 5600 • www.G35oilWorks.com Walker Custom Homes, Inc. July 12, 2019 Final Report of Geotechnical Observation and Testing Project No. 1-1097 On -Site Construction Phase Page 3 of 3 620 Poinsettia Avenue Corona Del Mar, California LIST OF SELECTED REFERENCES 1. G3SoilWorks, Inc., Report of Geotechnical Observation and Testing, 620 Poinsettia Avenue, Corona Del Mar, California, dated January 31, 2018, Project No. 1-1097. 2. G3SoilWorks, Inc., Preliminary Geotechnical Investigation Report, 620 Poinsettia Avenue, Corona Del Mar, California, dated February 27, 2017, Project No. 1-1097-A. 350 Fischer Ave. Front < Costa Mesa, CA 92626 • P: 714 668 5600 o www.G35oi[Works.com From: CITY OF NEWPORT BEACH COMMUNITY DEVELOPMENT DEPARTMENT BUILDING DIVISION 100 Civic Center Drive I P.O. Box 1768 1 Newport Beach, CA 92658-8915 www.newportbeachca.gov 1 (949) 644-3200 CIVIL ENGINEER'S CERTIFICATION FORM IT Consulting Engineers 14371 Euclid Street #2F Garden Grove, CA 92843 ATTENTION: GRADING ENGINEER, BUILDING DIVISION Date: July 11, 2019 GPC No.: 0631-2017 Tract/Subdivislon/Lot No.: Rough: _Final: x Project Names: 620 Poinsetta Ave Owner/Developer: Michael Walker Type of Project: _ Tract: X Drainage _ Commercial _ Other Industrial Yardage for Project: 12 cyCut: 48 cy Borrow: QQL(vRII: Export: Notes: Constructed per approved plans Notes: Constructed per approved plans I hereby approve the grading for this project in accordance with my responsibilities under the City Grading Code. I have inspected the project and hereby certify that all areas exhibit positive surface flow to public ways or City approved drainage devices. The gradi completed: final grading in conformance with, drainage �REOSPS3changes to the approved grading plan. a C,, Description of Changes: None Company: Name: John Tran (print) (sign) License No.: 62653 (RCE/LS) CITY OF NEWPORT BEACH Community Development Department I Building Division 100 Civic Center Dr.1 P.O. Box 1768 Newport Beach, CA 92658 www.newportbeachca.gov (949) 644-3200 t.;ALGREEN DOCUMENTATION COMPLIANCE CERTIFICATION ADDRESS: Gao 1"17 7P , PERMIT NO.: X r%6I!'-0`-tL(- THIS FORM SHALL BE COMPLETED AND SIGNED PRIOR TO REQUEST FOR FINAL BUILDING INSPECTION. ONE COPY OF THIS FORM SHALL BE SUBMITTED TO THE BUILDING INSPECTOR AT FINAL INSPECTION AND ONE SHALL BE PROVIDED TO THE BUILDING OWNER AS PART OF THE CAL GREEN CERTIFICATION PACKAGE. The following section shall be completed by a person with overall responsibility for the planning and design portion of the project. REQUIRED DOCUMENTATIONS PROVIDED TO THE PROPERTY OWNER(S) ❑ Franchise Hauler for Construction/Demolition Waste (65% min. reuse of nonhazardous waste) ❑ VOC Contents Limitation ❑ Formaldehyde Emissions Limitation ❑ T-24 Energy Certificate of Installations (Env., QII, Lighting, Photovoltaic, Mech., Plumb.) ❑ T-24 Energy Certificate of Verifications or Acceptance( Env., QII, Lighting, Photovoltaic, Mech., Plumb., HERS) ❑ Operations and Maintenance Manual MOISTURE CONTENT OF BUILDING MATERIAL (RESIDENTIAL CONSTRUCTION ONLY) U I certify that the moisture content of the wall and floor framing is less than 19 percent as determined in accordance with Section 4.505.3 of CAL Green prior to being enclosed. DECLARATION STATEMENT 1 certify under penalty of perjury, under the laws of the State of California, the information provided is true and correct. I certify that the installed measures, materials, components, or manufactured devices identified on this certificate conform to all applicable codes and regulations, and the installation is consistent with the plans and specifications approved by the enforcing agency. Person's Name: Responsible Person's Signature: Date Signed: Position/Title: Forms\CALGreen Documentation Compliance Cert Form 1-2017